[llvm-branch-commits] [llvm] [DirectX] adding support to read/write descriptor table data using obj2yaml/yaml2obj (PR #138315)

via llvm-branch-commits llvm-branch-commits at lists.llvm.org
Thu May 22 19:00:35 PDT 2025


https://github.com/joaosaffran updated https://github.com/llvm/llvm-project/pull/138315

>From 15eb6f50b947f59b265fd092d6a97c51e5742e6b Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Mon, 5 May 2025 18:26:14 +0000
Subject: [PATCH 01/29] fix naming

---
 llvm/include/llvm/BinaryFormat/DXContainerConstants.def | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/include/llvm/BinaryFormat/DXContainerConstants.def b/llvm/include/llvm/BinaryFormat/DXContainerConstants.def
index bd9bd760547dc..db0379b90ef6b 100644
--- a/llvm/include/llvm/BinaryFormat/DXContainerConstants.def
+++ b/llvm/include/llvm/BinaryFormat/DXContainerConstants.def
@@ -73,7 +73,7 @@ ROOT_ELEMENT_FLAG(11, SamplerHeapDirectlyIndexed)
 #endif // ROOT_ELEMENT_FLAG
 
  
-// ROOT_ELEMENT_FLAG(bit offset for the flag, name).
+// ROOT_DESCRIPTOR_FLAG(bit offset for the flag, name).
 #ifdef ROOT_DESCRIPTOR_FLAG
 
 ROOT_DESCRIPTOR_FLAG(0, NONE)

>From 3e263648724ba859d4d94f414dd3595e80a12f02 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Mon, 5 May 2025 21:10:38 +0000
Subject: [PATCH 02/29] moving root signature binary representation to RTS0
 namespace

---
 llvm/include/llvm/BinaryFormat/DXContainer.h  | 201 +++++++++---------
 .../llvm/MC/DXContainerRootSignature.h        |  52 ++---
 llvm/include/llvm/Object/DXContainer.h        |  63 +++---
 llvm/lib/BinaryFormat/DXContainer.cpp         |  16 +-
 llvm/lib/MC/DXContainerRootSignature.cpp      |  43 ++--
 llvm/lib/Object/DXContainer.cpp               |   3 +-
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp    |  14 +-
 llvm/lib/ObjectYAML/DXContainerYAML.cpp       |  43 ++--
 llvm/lib/Target/DirectX/DXILRootSignature.cpp |  16 +-
 llvm/unittests/Object/DXContainerTest.cpp     |   4 +-
 10 files changed, 237 insertions(+), 218 deletions(-)

diff --git a/llvm/include/llvm/BinaryFormat/DXContainer.h b/llvm/include/llvm/BinaryFormat/DXContainer.h
index a441fa3a36886..98e30b1b6a8af 100644
--- a/llvm/include/llvm/BinaryFormat/DXContainer.h
+++ b/llvm/include/llvm/BinaryFormat/DXContainer.h
@@ -153,62 +153,6 @@ enum class FeatureFlags : uint64_t {
 static_assert((uint64_t)FeatureFlags::NextUnusedBit <= 1ull << 63,
               "Shader flag bits exceed enum size.");
 
-#define ROOT_ELEMENT_FLAG(Num, Val) Val = 1ull << Num,
-enum class RootElementFlag : uint32_t {
-#include "DXContainerConstants.def"
-};
-
-#define ROOT_DESCRIPTOR_FLAG(Num, Val) Val = 1ull << Num,
-enum class RootDescriptorFlag : uint32_t {
-#include "DXContainerConstants.def"
-};
-
-#define DESCRIPTOR_RANGE_FLAG(Num, Val) Val = 1ull << Num,
-enum class DescriptorRangeFlag : uint32_t {
-#include "DXContainerConstants.def"
-};
-
-#define ROOT_PARAMETER(Val, Enum) Enum = Val,
-enum class RootParameterType : uint32_t {
-#include "DXContainerConstants.def"
-};
-
-ArrayRef<EnumEntry<RootParameterType>> getRootParameterTypes();
-
-#define DESCRIPTOR_RANGE(Val, Enum) Enum = Val,
-enum class DescriptorRangeType : uint32_t {
-#include "DXContainerConstants.def"
-};
-
-ArrayRef<EnumEntry<DescriptorRangeType>> getDescriptorRangeTypes();
-
-#define ROOT_PARAMETER(Val, Enum)                                              \
-  case Val:                                                                    \
-    return true;
-inline bool isValidParameterType(uint32_t V) {
-  switch (V) {
-#include "DXContainerConstants.def"
-  }
-  return false;
-}
-
-#define SHADER_VISIBILITY(Val, Enum) Enum = Val,
-enum class ShaderVisibility : uint32_t {
-#include "DXContainerConstants.def"
-};
-
-ArrayRef<EnumEntry<ShaderVisibility>> getShaderVisibility();
-
-#define SHADER_VISIBILITY(Val, Enum)                                           \
-  case Val:                                                                    \
-    return true;
-inline bool isValidShaderVisibility(uint32_t V) {
-  switch (V) {
-#include "DXContainerConstants.def"
-  }
-  return false;
-}
-
 PartType parsePartType(StringRef S);
 
 struct VertexPSVInfo {
@@ -597,8 +541,109 @@ struct ProgramSignatureElement {
 
 static_assert(sizeof(ProgramSignatureElement) == 32,
               "ProgramSignatureElement is misaligned");
-namespace RST0 {
+
+namespace RTS0 {
+
+#define ROOT_ELEMENT_FLAG(Num, Val) Val = 1ull << Num,
+enum class RootElementFlag : uint32_t {
+#include "DXContainerConstants.def"
+};
+
+#define ROOT_DESCRIPTOR_FLAG(Num, Val) Val = 1ull << Num,
+enum class RootDescriptorFlag : uint32_t {
+#include "DXContainerConstants.def"
+};
+
+#define DESCRIPTOR_RANGE_FLAG(Num, Val) Val = 1ull << Num,
+enum class DescriptorRangeFlag : uint32_t {
+#include "DXContainerConstants.def"
+};
+
+#define ROOT_PARAMETER(Val, Enum) Enum = Val,
+enum class RootParameterType : uint32_t {
+#include "DXContainerConstants.def"
+};
+
+ArrayRef<EnumEntry<RootParameterType>> getRootParameterTypes();
+
+#define DESCRIPTOR_RANGE(Val, Enum) Enum = Val,
+enum class DescriptorRangeType : uint32_t {
+#include "DXContainerConstants.def"
+};
+
+ArrayRef<EnumEntry<DescriptorRangeType>> getDescriptorRangeTypes();
+
+#define ROOT_PARAMETER(Val, Enum)                                              \
+  case Val:                                                                    \
+    return true;
+inline bool isValidParameterType(uint32_t V) {
+  switch (V) {
+#include "DXContainerConstants.def"
+  }
+  return false;
+}
+
+#define SHADER_VISIBILITY(Val, Enum) Enum = Val,
+enum class ShaderVisibility : uint32_t {
+#include "DXContainerConstants.def"
+};
+
+ArrayRef<EnumEntry<ShaderVisibility>> getShaderVisibility();
+
+#define SHADER_VISIBILITY(Val, Enum)                                           \
+  case Val:                                                                    \
+    return true;
+inline bool isValidShaderVisibility(uint32_t V) {
+  switch (V) {
+#include "DXContainerConstants.def"
+  }
+  return false;
+}
+
 namespace v0 {
+
+struct RootSignatureHeader {
+  uint32_t Version;
+  uint32_t NumParameters;
+  uint32_t ParametersOffset;
+  uint32_t NumStaticSamplers;
+  uint32_t StaticSamplerOffset;
+  uint32_t Flags;
+
+  void swapBytes() {
+    sys::swapByteOrder(Version);
+    sys::swapByteOrder(NumParameters);
+    sys::swapByteOrder(ParametersOffset);
+    sys::swapByteOrder(NumStaticSamplers);
+    sys::swapByteOrder(StaticSamplerOffset);
+    sys::swapByteOrder(Flags);
+  }
+};
+
+struct RootParameterHeader {
+  uint32_t ParameterType;
+  uint32_t ShaderVisibility;
+  uint32_t ParameterOffset;
+
+  void swapBytes() {
+    sys::swapByteOrder(ParameterType);
+    sys::swapByteOrder(ShaderVisibility);
+    sys::swapByteOrder(ParameterOffset);
+  }
+};
+
+struct RootConstants {
+  uint32_t ShaderRegister;
+  uint32_t RegisterSpace;
+  uint32_t Num32BitValues;
+
+  void swapBytes() {
+    sys::swapByteOrder(ShaderRegister);
+    sys::swapByteOrder(RegisterSpace);
+    sys::swapByteOrder(Num32BitValues);
+  }
+};
+
 struct RootDescriptor {
   uint32_t ShaderRegister;
   uint32_t RegisterSpace;
@@ -641,50 +686,10 @@ struct DescriptorRange : public v0::DescriptorRange {
   }
 };
 } // namespace v1
-} // namespace RST0
+} // namespace RTS0
 // following dx12 naming
 // https://learn.microsoft.com/en-us/windows/win32/api/d3d12/ns-d3d12-d3d12_root_constants
-struct RootConstants {
-  uint32_t ShaderRegister;
-  uint32_t RegisterSpace;
-  uint32_t Num32BitValues;
-
-  void swapBytes() {
-    sys::swapByteOrder(ShaderRegister);
-    sys::swapByteOrder(RegisterSpace);
-    sys::swapByteOrder(Num32BitValues);
-  }
-};
-
-struct RootParameterHeader {
-  uint32_t ParameterType;
-  uint32_t ShaderVisibility;
-  uint32_t ParameterOffset;
 
-  void swapBytes() {
-    sys::swapByteOrder(ParameterType);
-    sys::swapByteOrder(ShaderVisibility);
-    sys::swapByteOrder(ParameterOffset);
-  }
-};
-
-struct RootSignatureHeader {
-  uint32_t Version;
-  uint32_t NumParameters;
-  uint32_t ParametersOffset;
-  uint32_t NumStaticSamplers;
-  uint32_t StaticSamplerOffset;
-  uint32_t Flags;
-
-  void swapBytes() {
-    sys::swapByteOrder(Version);
-    sys::swapByteOrder(NumParameters);
-    sys::swapByteOrder(ParametersOffset);
-    sys::swapByteOrder(NumStaticSamplers);
-    sys::swapByteOrder(StaticSamplerOffset);
-    sys::swapByteOrder(Flags);
-  }
-};
 } // namespace dxbc
 } // namespace llvm
 
diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index 3f5960a6de2f9..84f6421d8ad9d 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -21,16 +21,16 @@ class raw_ostream;
 namespace mcdxbc {
 
 struct RootParameterInfo {
-  dxbc::RootParameterHeader Header;
+  dxbc::RTS0::v0::RootParameterHeader Header;
   size_t Location;
 
   RootParameterInfo() = default;
 
-  RootParameterInfo(dxbc::RootParameterHeader H, size_t L)
+  RootParameterInfo(dxbc::RTS0::v0::RootParameterHeader H, size_t L)
       : Header(H), Location(L) {}
 };
-using DescriptorRanges = std::variant<dxbc::RST0::v0::DescriptorRange,
-                                      dxbc::RST0::v1::DescriptorRange>;
+using DescriptorRanges = std::variant<dxbc::RTS0::v0::DescriptorRange,
+                                      dxbc::RTS0::v1::DescriptorRange>;
 struct DescriptorTable {
   SmallVector<DescriptorRanges> Ranges;
 
@@ -42,59 +42,61 @@ struct DescriptorTable {
   }
 };
 
-using RootDescriptor = std::variant<dxbc::RST0::v0::RootDescriptor,
-                                    dxbc::RST0::v1::RootDescriptor>;
+using RootDescriptor = std::variant<dxbc::RTS0::v0::RootDescriptor,
+                                    dxbc::RTS0::v1::RootDescriptor>;
 
-using ParametersView = std::variant<
-    const dxbc::RootConstants *, const dxbc::RST0::v0::RootDescriptor *,
-    const dxbc::RST0::v1::RootDescriptor *, const DescriptorTable *>;
+using ParametersView = std::variant<const dxbc::RTS0::v0::RootConstants *,
+                                    const dxbc::RTS0::v0::RootDescriptor *,
+                                    const dxbc::RTS0::v1::RootDescriptor *,
+                                    const DescriptorTable *>;
 struct RootParametersContainer {
   SmallVector<RootParameterInfo> ParametersInfo;
-  SmallVector<dxbc::RootConstants> Constants;
+  SmallVector<dxbc::RTS0::v0::RootConstants> Constants;
   SmallVector<RootDescriptor> Descriptors;
   SmallVector<DescriptorTable> Tables;
 
-  void addInfo(dxbc::RootParameterHeader H, size_t L) {
+  void addInfo(dxbc::RTS0::v0::RootParameterHeader H, size_t L) {
     ParametersInfo.push_back(RootParameterInfo(H, L));
   }
 
-  void addParameter(dxbc::RootParameterHeader H, dxbc::RootConstants C) {
+  void addParameter(dxbc::RTS0::v0::RootParameterHeader H,
+                    dxbc::RTS0::v0::RootConstants C) {
     addInfo(H, Constants.size());
     Constants.push_back(C);
   }
 
-  void addParameter(dxbc::RootParameterHeader H,
-                    dxbc::RST0::v0::RootDescriptor D) {
+  void addParameter(dxbc::RTS0::v0::RootParameterHeader H,
+                    dxbc::RTS0::v0::RootDescriptor D) {
     addInfo(H, Descriptors.size());
     Descriptors.push_back(D);
   }
 
-  void addParameter(dxbc::RootParameterHeader H,
-                    dxbc::RST0::v1::RootDescriptor D) {
+  void addParameter(dxbc::RTS0::v0::RootParameterHeader H,
+                    dxbc::RTS0::v1::RootDescriptor D) {
     addInfo(H, Descriptors.size());
     Descriptors.push_back(D);
   }
 
-  void addParameter(dxbc::RootParameterHeader H, DescriptorTable D) {
+  void addParameter(dxbc::RTS0::v0::RootParameterHeader H, DescriptorTable D) {
     addInfo(H, Tables.size());
     Tables.push_back(D);
   }
 
   std::optional<ParametersView> getParameter(const RootParameterInfo *H) const {
     switch (H->Header.ParameterType) {
-    case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
+    case llvm::to_underlying(dxbc::RTS0::RootParameterType::Constants32Bit):
       return &Constants[H->Location];
-    case llvm::to_underlying(dxbc::RootParameterType::CBV):
-    case llvm::to_underlying(dxbc::RootParameterType::SRV):
-    case llvm::to_underlying(dxbc::RootParameterType::UAV): {
+    case llvm::to_underlying(dxbc::RTS0::RootParameterType::CBV):
+    case llvm::to_underlying(dxbc::RTS0::RootParameterType::SRV):
+    case llvm::to_underlying(dxbc::RTS0::RootParameterType::UAV): {
       const RootDescriptor &VersionedParam = Descriptors[H->Location];
-      if (std::holds_alternative<dxbc::RST0::v0::RootDescriptor>(
+      if (std::holds_alternative<dxbc::RTS0::v0::RootDescriptor>(
               VersionedParam)) {
-        return &std::get<dxbc::RST0::v0::RootDescriptor>(VersionedParam);
+        return &std::get<dxbc::RTS0::v0::RootDescriptor>(VersionedParam);
       }
-      return &std::get<dxbc::RST0::v1::RootDescriptor>(VersionedParam);
+      return &std::get<dxbc::RTS0::v1::RootDescriptor>(VersionedParam);
     }
-    case llvm::to_underlying(dxbc::RootParameterType::DescriptorTable):
+    case llvm::to_underlying(dxbc::RTS0::RootParameterType::DescriptorTable):
       return &Tables[H->Location];
     }
 
diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index c6c22213d7de8..3e32870c5fb8f 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -120,11 +120,12 @@ template <typename T> struct ViewArray {
 
 namespace DirectX {
 struct RootParameterView {
-  const dxbc::RootParameterHeader &Header;
+  const dxbc::RTS0::v0::RootParameterHeader &Header;
   StringRef ParamData;
   uint32_t Version;
 
-  RootParameterView(uint32_t V, const dxbc::RootParameterHeader &H, StringRef P)
+  RootParameterView(uint32_t V, const dxbc::RTS0::v0::RootParameterHeader &H,
+                    StringRef P)
       : Header(H), ParamData(P), Version(V) {}
 
   template <typename T, typename VersionT = T> Expected<T> readParameter() {
@@ -147,29 +148,29 @@ struct RootParameterView {
 struct RootConstantView : RootParameterView {
   static bool classof(const RootParameterView *V) {
     return V->Header.ParameterType ==
-           (uint32_t)dxbc::RootParameterType::Constants32Bit;
+           (uint32_t)dxbc::RTS0::RootParameterType::Constants32Bit;
   }
 
-  llvm::Expected<dxbc::RootConstants> read() {
-    return readParameter<dxbc::RootConstants>();
+  llvm::Expected<dxbc::RTS0::v0::RootConstants> read() {
+    return readParameter<dxbc::RTS0::v0::RootConstants>();
   }
 };
 
 struct RootDescriptorView : RootParameterView {
   static bool classof(const RootParameterView *V) {
     return (V->Header.ParameterType ==
-                llvm::to_underlying(dxbc::RootParameterType::CBV) ||
+                llvm::to_underlying(dxbc::RTS0::RootParameterType::CBV) ||
             V->Header.ParameterType ==
-                llvm::to_underlying(dxbc::RootParameterType::SRV) ||
+                llvm::to_underlying(dxbc::RTS0::RootParameterType::SRV) ||
             V->Header.ParameterType ==
-                llvm::to_underlying(dxbc::RootParameterType::UAV));
+                llvm::to_underlying(dxbc::RTS0::RootParameterType::UAV));
   }
 
-  llvm::Expected<dxbc::RST0::v1::RootDescriptor> read(uint32_t Version) {
+  llvm::Expected<dxbc::RTS0::v1::RootDescriptor> read(uint32_t Version) {
     if (Version == 1)
-      return readParameter<dxbc::RST0::v1::RootDescriptor,
-                           dxbc::RST0::v0::RootDescriptor>();
-    return readParameter<dxbc::RST0::v1::RootDescriptor>();
+      return readParameter<dxbc::RTS0::v1::RootDescriptor,
+                           dxbc::RTS0::v0::RootDescriptor>();
+    return readParameter<dxbc::RTS0::v1::RootDescriptor>();
   }
 };
 template <typename T> struct DescriptorTable {
@@ -186,11 +187,11 @@ template <typename T> struct TemplateTypeToVersion {
   static constexpr uint32_t Value = -1;
 };
 
-template <> struct TemplateTypeToVersion<dxbc::RST0::v0::DescriptorRange> {
+template <> struct TemplateTypeToVersion<dxbc::RTS0::v0::DescriptorRange> {
   static constexpr uint32_t Value = 1;
 };
 
-template <> struct TemplateTypeToVersion<dxbc::RST0::v1::DescriptorRange> {
+template <> struct TemplateTypeToVersion<dxbc::RTS0::v1::DescriptorRange> {
   static constexpr uint32_t Value = 2;
 };
 
@@ -199,7 +200,8 @@ template <typename T> struct DescriptorTableView : RootParameterView {
 
   static bool classof(const RootParameterView *V) {
     return (V->Header.ParameterType ==
-            llvm::to_underlying(dxbc::RootParameterType::DescriptorTable)) &&
+            llvm::to_underlying(
+                dxbc::RTS0::RootParameterType::DescriptorTable)) &&
            (V->Version == TemplateTypeToVersion<T>::Value);
   }
 
@@ -234,10 +236,11 @@ class RootSignature {
   uint32_t NumStaticSamplers;
   uint32_t StaticSamplersOffset;
   uint32_t Flags;
-  ViewArray<dxbc::RootParameterHeader> ParametersHeaders;
+  ViewArray<dxbc::RTS0::v0::RootParameterHeader> ParametersHeaders;
   StringRef PartData;
 
-  using param_header_iterator = ViewArray<dxbc::RootParameterHeader>::iterator;
+  using param_header_iterator =
+      ViewArray<dxbc::RTS0::v0::RootParameterHeader>::iterator;
 
 public:
   RootSignature(StringRef PD) : PartData(PD) {}
@@ -255,33 +258,33 @@ class RootSignature {
   uint32_t getFlags() const { return Flags; }
 
   llvm::Expected<RootParameterView>
-  getParameter(const dxbc::RootParameterHeader &Header) const {
+  getParameter(const dxbc::RTS0::v0::RootParameterHeader &Header) const {
     size_t DataSize;
 
-    if (!dxbc::isValidParameterType(Header.ParameterType))
+    if (!dxbc::RTS0::isValidParameterType(Header.ParameterType))
       return parseFailed("invalid parameter type");
 
-    switch (static_cast<dxbc::RootParameterType>(Header.ParameterType)) {
-    case dxbc::RootParameterType::Constants32Bit:
-      DataSize = sizeof(dxbc::RootConstants);
+    switch (static_cast<dxbc::RTS0::RootParameterType>(Header.ParameterType)) {
+    case dxbc::RTS0::RootParameterType::Constants32Bit:
+      DataSize = sizeof(dxbc::RTS0::v0::RootConstants);
       break;
-    case dxbc::RootParameterType::CBV:
-    case dxbc::RootParameterType::SRV:
-    case dxbc::RootParameterType::UAV:
+    case dxbc::RTS0::RootParameterType::CBV:
+    case dxbc::RTS0::RootParameterType::SRV:
+    case dxbc::RTS0::RootParameterType::UAV:
       if (Version == 1)
-        DataSize = sizeof(dxbc::RST0::v0::RootDescriptor);
+        DataSize = sizeof(dxbc::RTS0::v0::RootDescriptor);
       else
-        DataSize = sizeof(dxbc::RST0::v1::RootDescriptor);
+        DataSize = sizeof(dxbc::RTS0::v1::RootDescriptor);
       break;
-    case dxbc::RootParameterType::DescriptorTable:
+    case dxbc::RTS0::RootParameterType::DescriptorTable:
       uint32_t NumRanges =
           support::endian::read<uint32_t, llvm::endianness::little>(
               PartData.begin() + Header.ParameterOffset);
       if (Version == 1)
-        DataSize = sizeof(dxbc::RST0::v0::DescriptorRange) * NumRanges +
+        DataSize = sizeof(dxbc::RTS0::v0::DescriptorRange) * NumRanges +
                    2 * sizeof(uint32_t);
       else
-        DataSize = sizeof(dxbc::RST0::v1::DescriptorRange) * NumRanges +
+        DataSize = sizeof(dxbc::RTS0::v1::DescriptorRange) * NumRanges +
                    2 * sizeof(uint32_t);
       break;
     }
diff --git a/llvm/lib/BinaryFormat/DXContainer.cpp b/llvm/lib/BinaryFormat/DXContainer.cpp
index 8e7b7d313706a..1e4fc002f1519 100644
--- a/llvm/lib/BinaryFormat/DXContainer.cpp
+++ b/llvm/lib/BinaryFormat/DXContainer.cpp
@@ -60,23 +60,27 @@ ArrayRef<EnumEntry<SigComponentType>> dxbc::getSigComponentTypes() {
   return ArrayRef(SigComponentTypes);
 }
 
-#define SHADER_VISIBILITY(Val, Enum) {#Enum, ShaderVisibility::Enum},
+#define SHADER_VISIBILITY(Val, Enum)                                           \
+  {#Enum, dxbc::RTS0::ShaderVisibility::Enum},
 
-static const EnumEntry<ShaderVisibility> ShaderVisibilityValues[] = {
+static const EnumEntry<dxbc::RTS0::ShaderVisibility> ShaderVisibilityValues[] =
+    {
 #include "llvm/BinaryFormat/DXContainerConstants.def"
 };
 
-ArrayRef<EnumEntry<ShaderVisibility>> dxbc::getShaderVisibility() {
+ArrayRef<EnumEntry<dxbc::RTS0::ShaderVisibility>>
+dxbc::RTS0::getShaderVisibility() {
   return ArrayRef(ShaderVisibilityValues);
 }
 
-#define ROOT_PARAMETER(Val, Enum) {#Enum, RootParameterType::Enum},
+#define ROOT_PARAMETER(Val, Enum) {#Enum, dxbc::RTS0::RootParameterType::Enum},
 
-static const EnumEntry<RootParameterType> RootParameterTypes[] = {
+static const EnumEntry<dxbc::RTS0::RootParameterType> RootParameterTypes[] = {
 #include "llvm/BinaryFormat/DXContainerConstants.def"
 };
 
-ArrayRef<EnumEntry<RootParameterType>> dxbc::getRootParameterTypes() {
+ArrayRef<EnumEntry<dxbc::RTS0::RootParameterType>>
+dxbc::RTS0::getRootParameterTypes() {
   return ArrayRef(RootParameterTypes);
 }
 
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 4c725969e63cf..352a8d3a9c603 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -21,25 +21,25 @@ class SizeCalculatorVisitor {
   SizeCalculatorVisitor(uint32_t Version, size_t &SizeRef)
       : Size(SizeRef), Version(Version) {}
 
-  void operator()(const dxbc::RootConstants *Value) const {
-    Size += sizeof(dxbc::RootConstants);
+  void operator()(const dxbc::RTS0::v0::RootConstants *Value) const {
+    Size += sizeof(dxbc::RTS0::v0::RootConstants);
   }
 
-  void operator()(const dxbc::RST0::v0::RootDescriptor *Value) const {
-    Size += sizeof(dxbc::RST0::v0::RootDescriptor);
+  void operator()(const dxbc::RTS0::v0::RootDescriptor *Value) const {
+    Size += sizeof(dxbc::RTS0::v0::RootDescriptor);
   }
 
-  void operator()(const dxbc::RST0::v1::RootDescriptor *Value) const {
-    Size += sizeof(dxbc::RST0::v1::RootDescriptor);
+  void operator()(const dxbc::RTS0::v1::RootDescriptor *Value) const {
+    Size += sizeof(dxbc::RTS0::v1::RootDescriptor);
   }
 
   void operator()(const DescriptorTable *Value) const {
     if (Version == 1)
       Size +=
-          sizeof(dxbc::RST0::v0::DescriptorRange) * Value->Ranges.size() + 8;
+          sizeof(dxbc::RTS0::v0::DescriptorRange) * Value->Ranges.size() + 8;
     else
       Size +=
-          sizeof(dxbc::RST0::v1::DescriptorRange) * Value->Ranges.size() + 8;
+          sizeof(dxbc::RTS0::v1::DescriptorRange) * Value->Ranges.size() + 8;
   }
 
 private:
@@ -63,8 +63,9 @@ static void rewriteOffsetToCurrentByte(raw_svector_ostream &Stream,
 }
 
 size_t RootSignatureDesc::getSize() const {
-  size_t Size = sizeof(dxbc::RootSignatureHeader) +
-                ParametersContainer.size() * sizeof(dxbc::RootParameterHeader);
+  size_t Size =
+      sizeof(dxbc::RTS0::v0::RootSignatureHeader) +
+      ParametersContainer.size() * sizeof(dxbc::RTS0::v0::RootParameterHeader);
 
   for (const auto &I : ParametersContainer) {
     std::optional<ParametersView> P = ParametersContainer.getParameter(&I);
@@ -108,26 +109,28 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
     auto P = ParametersContainer.getParameter(H);
     if (!P)
       continue;
-    if (std::holds_alternative<const dxbc::RootConstants *>(P.value())) {
-      auto *Constants = std::get<const dxbc::RootConstants *>(P.value());
+    if (std::holds_alternative<const dxbc::RTS0::v0::RootConstants *>(
+            P.value())) {
+      auto *Constants =
+          std::get<const dxbc::RTS0::v0::RootConstants *>(P.value());
       support::endian::write(BOS, Constants->ShaderRegister,
                              llvm::endianness::little);
       support::endian::write(BOS, Constants->RegisterSpace,
                              llvm::endianness::little);
       support::endian::write(BOS, Constants->Num32BitValues,
                              llvm::endianness::little);
-    } else if (std::holds_alternative<const dxbc::RST0::v0::RootDescriptor *>(
+    } else if (std::holds_alternative<const dxbc::RTS0::v0::RootDescriptor *>(
                    *P)) {
       auto *Descriptor =
-          std::get<const dxbc::RST0::v0::RootDescriptor *>(P.value());
+          std::get<const dxbc::RTS0::v0::RootDescriptor *>(P.value());
       support::endian::write(BOS, Descriptor->ShaderRegister,
                              llvm::endianness::little);
       support::endian::write(BOS, Descriptor->RegisterSpace,
                              llvm::endianness::little);
-    } else if (std::holds_alternative<const dxbc::RST0::v1::RootDescriptor *>(
+    } else if (std::holds_alternative<const dxbc::RTS0::v1::RootDescriptor *>(
                    *P)) {
       auto *Descriptor =
-          std::get<const dxbc::RST0::v1::RootDescriptor *>(P.value());
+          std::get<const dxbc::RTS0::v1::RootDescriptor *>(P.value());
 
       support::endian::write(BOS, Descriptor->ShaderRegister,
                              llvm::endianness::little);
@@ -141,8 +144,8 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       rewriteOffsetToCurrentByte(BOS, writePlaceholder(BOS));
       for (const auto &R : *Table) {
-        if (std::holds_alternative<dxbc::RST0::v0::DescriptorRange>(R)) {
-          auto Range = std::get<dxbc::RST0::v0::DescriptorRange>(R);
+        if (std::holds_alternative<dxbc::RTS0::v0::DescriptorRange>(R)) {
+          auto Range = std::get<dxbc::RTS0::v0::DescriptorRange>(R);
 
           support::endian::write(BOS, Range.RangeType,
                                  llvm::endianness::little);
@@ -155,8 +158,8 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
           support::endian::write(BOS, Range.OffsetInDescriptorsFromTableStart,
                                  llvm::endianness::little);
         } else {
-          if (std::holds_alternative<dxbc::RST0::v1::DescriptorRange>(R)) {
-            auto Range = std::get<dxbc::RST0::v1::DescriptorRange>(R);
+          if (std::holds_alternative<dxbc::RTS0::v1::DescriptorRange>(R)) {
+            auto Range = std::get<dxbc::RTS0::v1::DescriptorRange>(R);
 
             support::endian::write(BOS, Range.RangeType,
                                    llvm::endianness::little);
diff --git a/llvm/lib/Object/DXContainer.cpp b/llvm/lib/Object/DXContainer.cpp
index 95f6788e75aa6..f4617bd87e0f7 100644
--- a/llvm/lib/Object/DXContainer.cpp
+++ b/llvm/lib/Object/DXContainer.cpp
@@ -273,7 +273,8 @@ Error DirectX::RootSignature::parse() {
   Current += sizeof(uint32_t);
 
   ParametersHeaders.Data = PartData.substr(
-      RootParametersOffset, NumParameters * sizeof(dxbc::RootParameterHeader));
+      RootParametersOffset,
+      NumParameters * sizeof(dxbc::RTS0::v0::RootParameterHeader));
 
   return Error::success();
 }
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index 9f31f4efdeab7..e24d5cb528389 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -277,15 +277,15 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
       RS.StaticSamplersOffset = P.RootSignature->StaticSamplersOffset;
 
       for (const auto &Param : P.RootSignature->Parameters) {
-        auto Header = dxbc::RootParameterHeader{Param.Type, Param.Visibility,
-                                                Param.Offset};
+        auto Header = dxbc::RTS0::v0::RootParameterHeader{
+            Param.Type, Param.Visibility, Param.Offset};
 
         if (std::holds_alternative<DXContainerYAML::RootConstantsYaml>(
                 Param.Data)) {
           auto ConstantYaml =
               std::get<DXContainerYAML::RootConstantsYaml>(Param.Data);
 
-          dxbc::RootConstants Constants;
+          dxbc::RTS0::v0::RootConstants Constants;
           Constants.Num32BitValues = ConstantYaml.Num32BitValues;
           Constants.RegisterSpace = ConstantYaml.RegisterSpace;
           Constants.ShaderRegister = ConstantYaml.ShaderRegister;
@@ -296,12 +296,12 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
               std::get<DXContainerYAML::RootDescriptorYaml>(Param.Data);
 
           if (RS.Version == 1) {
-            dxbc::RST0::v0::RootDescriptor Descriptor;
+            dxbc::RTS0::v0::RootDescriptor Descriptor;
             Descriptor.RegisterSpace = DescriptorYaml.RegisterSpace;
             Descriptor.ShaderRegister = DescriptorYaml.ShaderRegister;
             RS.ParametersContainer.addParameter(Header, Descriptor);
           } else {
-            dxbc::RST0::v1::RootDescriptor Descriptor;
+            dxbc::RTS0::v1::RootDescriptor Descriptor;
             Descriptor.RegisterSpace = DescriptorYaml.RegisterSpace;
             Descriptor.ShaderRegister = DescriptorYaml.ShaderRegister;
             Descriptor.Flags = DescriptorYaml.getEncodedFlags();
@@ -315,7 +315,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
 
           for (const auto &R : TableYaml.Ranges) {
             if (RS.Version == 1) {
-              dxbc::RST0::v0::DescriptorRange Range;
+              dxbc::RTS0::v0::DescriptorRange Range;
               Range.RangeType = R.RangeType;
               Range.NumDescriptors = R.NumDescriptors;
               Range.BaseShaderRegister = R.BaseShaderRegister;
@@ -324,7 +324,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
                   R.OffsetInDescriptorsFromTableStart;
               Table.Ranges.push_back(Range);
             } else {
-              dxbc::RST0::v1::DescriptorRange Range;
+              dxbc::RTS0::v1::DescriptorRange Range;
               Range.RangeType = R.RangeType;
               Range.NumDescriptors = R.NumDescriptors;
               Range.BaseShaderRegister = R.BaseShaderRegister;
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index 8a578a838a249..f61ef9dc3e2ef 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -48,9 +48,9 @@ DXContainerYAML::RootSignatureYamlDesc::create(
   RootSigDesc.RootParametersOffset = Data.getRootParametersOffset();
 
   uint32_t Flags = Data.getFlags();
-  for (const dxbc::RootParameterHeader &PH : Data.param_headers()) {
+  for (const dxbc::RTS0::v0::RootParameterHeader &PH : Data.param_headers()) {
 
-    if (!dxbc::isValidParameterType(PH.ParameterType))
+    if (!dxbc::RTS0::isValidParameterType(PH.ParameterType))
       return createStringError(std::errc::invalid_argument,
                                "Invalid value for parameter type");
 
@@ -58,7 +58,7 @@ DXContainerYAML::RootSignatureYamlDesc::create(
     NewP.Offset = PH.ParameterOffset;
     NewP.Type = PH.ParameterType;
 
-    if (!dxbc::isValidShaderVisibility(PH.ShaderVisibility))
+    if (!dxbc::RTS0::isValidShaderVisibility(PH.ShaderVisibility))
       return createStringError(std::errc::invalid_argument,
                                "Invalid value for shader visibility");
 
@@ -71,7 +71,8 @@ DXContainerYAML::RootSignatureYamlDesc::create(
     object::DirectX::RootParameterView ParamView = ParamViewOrErr.get();
 
     if (auto *RCV = dyn_cast<object::DirectX::RootConstantView>(&ParamView)) {
-      llvm::Expected<dxbc::RootConstants> ConstantsOrErr = RCV->read();
+      llvm::Expected<dxbc::RTS0::v0::RootConstants> ConstantsOrErr =
+          RCV->read();
       if (Error E = ConstantsOrErr.takeError())
         return std::move(E);
 
@@ -83,7 +84,7 @@ DXContainerYAML::RootSignatureYamlDesc::create(
       NewP.Data = ConstantYaml;
     } else if (auto *RDV =
                    dyn_cast<object::DirectX::RootDescriptorView>(&ParamView)) {
-      llvm::Expected<dxbc::RST0::v1::RootDescriptor> DescriptorOrErr =
+      llvm::Expected<dxbc::RTS0::v1::RootDescriptor> DescriptorOrErr =
           RDV->read(Version);
       if (Error E = DescriptorOrErr.takeError())
         return std::move(E);
@@ -95,14 +96,14 @@ DXContainerYAML::RootSignatureYamlDesc::create(
 #define ROOT_DESCRIPTOR_FLAG(Num, Val)                                         \
   YamlDescriptor.Val =                                                         \
       (Descriptor.Flags &                                                      \
-       llvm::to_underlying(dxbc::RootDescriptorFlag::Val)) > 0;
+       llvm::to_underlying(dxbc::RTS0::RootDescriptorFlag::Val)) > 0;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
       }
       NewP.Data = YamlDescriptor;
     } else if (auto *TDV = dyn_cast<object::DirectX::DescriptorTableView<
-                   dxbc::RST0::v0::DescriptorRange>>(&ParamView)) {
+                   dxbc::RTS0::v0::DescriptorRange>>(&ParamView)) {
       llvm::Expected<
-          object::DirectX::DescriptorTable<dxbc::RST0::v0::DescriptorRange>>
+          object::DirectX::DescriptorTable<dxbc::RTS0::v0::DescriptorRange>>
           TableOrErr = TDV->read();
       if (Error E = TableOrErr.takeError())
         return std::move(E);
@@ -125,9 +126,9 @@ DXContainerYAML::RootSignatureYamlDesc::create(
       }
       NewP.Data = YamlTable;
     } else if (auto *TDV = dyn_cast<object::DirectX::DescriptorTableView<
-                   dxbc::RST0::v1::DescriptorRange>>(&ParamView)) {
+                   dxbc::RTS0::v1::DescriptorRange>>(&ParamView)) {
       llvm::Expected<
-          object::DirectX::DescriptorTable<dxbc::RST0::v1::DescriptorRange>>
+          object::DirectX::DescriptorTable<dxbc::RTS0::v1::DescriptorRange>>
           TableOrErr = TDV->read();
       if (Error E = TableOrErr.takeError())
         return std::move(E);
@@ -146,8 +147,8 @@ DXContainerYAML::RootSignatureYamlDesc::create(
         NewR.RegisterSpace = R.RegisterSpace;
         NewR.RangeType = R.RangeType;
 #define DESCRIPTOR_RANGE_FLAG(Num, Val)                                        \
-  NewR.Val =                                                                   \
-      (R.Flags & llvm::to_underlying(dxbc::DescriptorRangeFlag::Val)) > 0;
+  NewR.Val = (R.Flags &                                                        \
+              llvm::to_underlying(dxbc::RTS0::DescriptorRangeFlag::Val)) > 0;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
         YamlTable.Ranges.push_back(NewR);
       }
@@ -158,7 +159,7 @@ DXContainerYAML::RootSignatureYamlDesc::create(
   }
 #define ROOT_ELEMENT_FLAG(Num, Val)                                            \
   RootSigDesc.Val =                                                            \
-      (Flags & llvm::to_underlying(dxbc::RootElementFlag::Val)) > 0;
+      (Flags & llvm::to_underlying(dxbc::RTS0::RootElementFlag::Val)) > 0;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
   return RootSigDesc;
 }
@@ -167,7 +168,7 @@ uint32_t DXContainerYAML::RootDescriptorYaml::getEncodedFlags() const {
   uint64_t Flag = 0;
 #define ROOT_DESCRIPTOR_FLAG(Num, Val)                                         \
   if (Val)                                                                     \
-    Flag |= (uint32_t)dxbc::RootDescriptorFlag::Val;
+    Flag |= (uint32_t)dxbc::RTS0::RootDescriptorFlag::Val;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
   return Flag;
 }
@@ -176,7 +177,7 @@ uint32_t DXContainerYAML::RootSignatureYamlDesc::getEncodedFlags() {
   uint64_t Flag = 0;
 #define ROOT_ELEMENT_FLAG(Num, Val)                                            \
   if (Val)                                                                     \
-    Flag |= (uint32_t)dxbc::RootElementFlag::Val;
+    Flag |= (uint32_t)dxbc::RTS0::RootElementFlag::Val;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
   return Flag;
 }
@@ -185,7 +186,7 @@ uint32_t DXContainerYAML::DescriptorRangeYaml::getEncodedFlags() const {
   uint64_t Flag = 0;
 #define DESCRIPTOR_RANGE_FLAG(Num, Val)                                        \
   if (Val)                                                                     \
-    Flag |= (uint32_t)dxbc::DescriptorRangeFlag::Val;
+    Flag |= (uint32_t)dxbc::RTS0::DescriptorRangeFlag::Val;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
   return Flag;
 }
@@ -401,23 +402,23 @@ void MappingTraits<llvm::DXContainerYAML::RootParameterYamlDesc>::mapping(
   IO.mapRequired("ShaderVisibility", P.Visibility);
 
   switch (P.Type) {
-  case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit): {
+  case llvm::to_underlying(dxbc::RTS0::RootParameterType::Constants32Bit): {
     DXContainerYAML::RootConstantsYaml Constants;
     if (IO.outputting())
       Constants = std::get<DXContainerYAML::RootConstantsYaml>(P.Data);
     IO.mapRequired("Constants", Constants);
     P.Data = Constants;
   } break;
-  case llvm::to_underlying(dxbc::RootParameterType::CBV):
-  case llvm::to_underlying(dxbc::RootParameterType::SRV):
-  case llvm::to_underlying(dxbc::RootParameterType::UAV): {
+  case llvm::to_underlying(dxbc::RTS0::RootParameterType::CBV):
+  case llvm::to_underlying(dxbc::RTS0::RootParameterType::SRV):
+  case llvm::to_underlying(dxbc::RTS0::RootParameterType::UAV): {
     DXContainerYAML::RootDescriptorYaml Descriptor;
     if (IO.outputting())
       Descriptor = std::get<DXContainerYAML::RootDescriptorYaml>(P.Data);
     IO.mapRequired("Descriptor", Descriptor);
     P.Data = Descriptor;
   } break;
-  case llvm::to_underlying(dxbc::RootParameterType::DescriptorTable): {
+  case llvm::to_underlying(dxbc::RTS0::RootParameterType::DescriptorTable): {
     DXContainerYAML::DescriptorTableYaml Table;
     if (IO.outputting())
       Table = std::get<DXContainerYAML::DescriptorTableYaml>(P.Data);
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index 30ca4d8f7c8ed..ddd3bd11c3ab0 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -76,16 +76,16 @@ static bool parseRootConstants(LLVMContext *Ctx, mcdxbc::RootSignatureDesc &RSD,
   if (RootConstantNode->getNumOperands() != 5)
     return reportError(Ctx, "Invalid format for RootConstants Element");
 
-  dxbc::RootParameterHeader Header;
+  dxbc::RTS0::v0::RootParameterHeader Header;
   Header.ParameterType =
-      llvm::to_underlying(dxbc::RootParameterType::Constants32Bit);
+      llvm::to_underlying(dxbc::RTS0::RootParameterType::Constants32Bit);
 
   if (std::optional<uint32_t> Val = extractMdIntValue(RootConstantNode, 1))
     Header.ShaderVisibility = *Val;
   else
     return reportError(Ctx, "Invalid value for ShaderVisibility");
 
-  dxbc::RootConstants Constants;
+  dxbc::RTS0::v0::RootConstants Constants;
   if (std::optional<uint32_t> Val = extractMdIntValue(RootConstantNode, 2))
     Constants.ShaderRegister = *Val;
   else
@@ -167,11 +167,11 @@ static bool validate(LLVMContext *Ctx, const mcdxbc::RootSignatureDesc &RSD) {
   }
 
   for (const llvm::mcdxbc::RootParameterInfo &Info : RSD.ParametersContainer) {
-    if (!dxbc::isValidShaderVisibility(Info.Header.ShaderVisibility))
+    if (!dxbc::RTS0::isValidShaderVisibility(Info.Header.ShaderVisibility))
       return reportValueError(Ctx, "ShaderVisibility",
                               Info.Header.ShaderVisibility);
 
-    assert(dxbc::isValidParameterType(Info.Header.ParameterType) &&
+    assert(dxbc::RTS0::isValidParameterType(Info.Header.ParameterType) &&
            "Invalid value for ParameterType");
   }
 
@@ -246,7 +246,7 @@ analyzeModule(Module &M) {
     // Clang emits the root signature data in dxcontainer following a specific
     // sequence. First the header, then the root parameters. So the header
     // offset will always equal to the header size.
-    RSD.RootParameterOffset = sizeof(dxbc::RootSignatureHeader);
+    RSD.RootParameterOffset = sizeof(dxbc::RTS0::v0::RootSignatureHeader);
 
     if (parse(Ctx, RSD, RootElementListNode) || validate(Ctx, RSD)) {
       return RSDMap;
@@ -301,8 +301,8 @@ PreservedAnalyses RootSignatureAnalysisPrinter::run(Module &M,
           RS.ParametersContainer.getParameter(&Info);
       if (!P)
         continue;
-      if (std::holds_alternative<const dxbc::RootConstants *>(*P)) {
-        auto *Constants = std::get<const dxbc::RootConstants *>(*P);
+      if (std::holds_alternative<const dxbc::RTS0::v0::RootConstants *>(*P)) {
+        auto *Constants = std::get<const dxbc::RTS0::v0::RootConstants *>(*P);
         OS << indent(Space + 2)
            << "Register Space: " << Constants->RegisterSpace << "\n";
         OS << indent(Space + 2)
diff --git a/llvm/unittests/Object/DXContainerTest.cpp b/llvm/unittests/Object/DXContainerTest.cpp
index 955b832459879..602aae875a283 100644
--- a/llvm/unittests/Object/DXContainerTest.cpp
+++ b/llvm/unittests/Object/DXContainerTest.cpp
@@ -1086,7 +1086,7 @@ TEST(RootSignature, ParseDescriptorTable) {
     ASSERT_THAT_ERROR(ParamView.takeError(), Succeeded());
 
     auto *DescriptorTableView =
-        dyn_cast<DirectX::DescriptorTableView<dxbc::RST0::v1::DescriptorRange>>(
+        dyn_cast<DirectX::DescriptorTableView<dxbc::RTS0::v1::DescriptorRange>>(
             &*ParamView);
     ASSERT_TRUE(DescriptorTableView != nullptr);
     auto Table = DescriptorTableView->read();
@@ -1139,7 +1139,7 @@ TEST(RootSignature, ParseDescriptorTable) {
     ASSERT_THAT_ERROR(ParamView.takeError(), Succeeded());
 
     auto *DescriptorTableView =
-        dyn_cast<DirectX::DescriptorTableView<dxbc::RST0::v0::DescriptorRange>>(
+        dyn_cast<DirectX::DescriptorTableView<dxbc::RTS0::v0::DescriptorRange>>(
             &*ParamView);
     ASSERT_TRUE(DescriptorTableView != nullptr);
     auto Table = DescriptorTableView->read();

>From b9d7f076e9c1b3a1c1027b4ed9e8012a58b7cd2b Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Mon, 5 May 2025 18:26:14 +0000
Subject: [PATCH 03/29] fix naming

---
 llvm/include/llvm/BinaryFormat/DXContainerConstants.def | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/include/llvm/BinaryFormat/DXContainerConstants.def b/llvm/include/llvm/BinaryFormat/DXContainerConstants.def
index bd9bd760547dc..db0379b90ef6b 100644
--- a/llvm/include/llvm/BinaryFormat/DXContainerConstants.def
+++ b/llvm/include/llvm/BinaryFormat/DXContainerConstants.def
@@ -73,7 +73,7 @@ ROOT_ELEMENT_FLAG(11, SamplerHeapDirectlyIndexed)
 #endif // ROOT_ELEMENT_FLAG
 
  
-// ROOT_ELEMENT_FLAG(bit offset for the flag, name).
+// ROOT_DESCRIPTOR_FLAG(bit offset for the flag, name).
 #ifdef ROOT_DESCRIPTOR_FLAG
 
 ROOT_DESCRIPTOR_FLAG(0, NONE)

>From 46cc8c1a557c2783159411b72543e1d350e2b55b Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Thu, 8 May 2025 17:37:32 +0000
Subject: [PATCH 04/29] addressing comments

---
 llvm/include/llvm/MC/DXContainerRootSignature.h | 2 --
 llvm/lib/MC/DXContainerRootSignature.cpp        | 2 --
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp      | 6 ++++--
 llvm/lib/Target/DirectX/DXILRootSignature.cpp   | 1 -
 4 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index c8af613a57094..b290f4c96c20f 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -6,9 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/BinaryFormat/DXContainer.h"
-#include <cstddef>
 #include <cstdint>
 #include <optional>
 #include <utility>
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 641c2f5fa1b1b..54a8bd3e90c69 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -8,9 +8,7 @@
 
 #include "llvm/MC/DXContainerRootSignature.h"
 #include "llvm/ADT/SmallString.h"
-#include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/Support/EndianStream.h"
-#include <variant>
 
 using namespace llvm;
 using namespace llvm::mcdxbc;
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index b8ea1b048edfe..1c163587d295c 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -298,11 +298,13 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
             Descriptor.RegisterSpace = Param.Descriptor.RegisterSpace;
             Descriptor.ShaderRegister = Param.Descriptor.ShaderRegister;
             Descriptor.Flags = Param.Descriptor.getEncodedFlags();
-          RS.ParametersContainer.addParameter(Header, Descriptor);
+            RS.ParametersContainer.addParameter(Header, Descriptor);
           }
           break;
         default:
-          // Handling invalid parameter type edge case
+          // Handling invalid parameter type edge case. We intentionally let
+          // obj2yaml/yaml2obj parse and emit invalid dxcontainer data, in order
+          // for that to be used as a testing tool more effectively.
           RS.ParametersContainer.addInfo(Header, -1);
         }
       }
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index 30ca4d8f7c8ed..1bd816b026fec 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -30,7 +30,6 @@
 #include <cstdint>
 #include <optional>
 #include <utility>
-#include <variant>
 
 using namespace llvm;
 using namespace llvm::dxil;

>From 1b3e10ab85716e194ce16c273a6091e0136bf890 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Thu, 8 May 2025 21:44:55 +0000
Subject: [PATCH 05/29] addressing comments

---
 llvm/include/llvm/BinaryFormat/DXContainer.h  | 21 ++++++++-----
 .../llvm/MC/DXContainerRootSignature.h        |  2 +-
 llvm/include/llvm/Object/DXContainer.h        | 31 +++++++++++--------
 .../include/llvm/ObjectYAML/DXContainerYAML.h |  2 +-
 llvm/lib/MC/DXContainerRootSignature.cpp      |  4 +--
 llvm/lib/ObjectYAML/DXContainerYAML.cpp       |  2 +-
 6 files changed, 36 insertions(+), 26 deletions(-)

diff --git a/llvm/include/llvm/BinaryFormat/DXContainer.h b/llvm/include/llvm/BinaryFormat/DXContainer.h
index 3dbcfa82f3d7c..4fbc0cf1e5954 100644
--- a/llvm/include/llvm/BinaryFormat/DXContainer.h
+++ b/llvm/include/llvm/BinaryFormat/DXContainer.h
@@ -585,8 +585,8 @@ struct ProgramSignatureElement {
 
 static_assert(sizeof(ProgramSignatureElement) == 32,
               "ProgramSignatureElement is misaligned");
-namespace RST0 {
-namespace v0 {
+namespace RTS0 {
+namespace v1 {
 struct RootDescriptor {
   uint32_t ShaderRegister;
   uint32_t RegisterSpace;
@@ -595,18 +595,23 @@ struct RootDescriptor {
     sys::swapByteOrder(RegisterSpace);
   }
 };
-} // namespace v0
+} // namespace v1
 
-namespace v1 {
-struct RootDescriptor : public v0::RootDescriptor {
+namespace v2 {
+struct RootDescriptor : public v1::RootDescriptor {
   uint32_t Flags;
+
+  RootDescriptor() = default;
+  RootDescriptor(v1::RootDescriptor &Base)
+      : v1::RootDescriptor(Base), Flags(0u) {}
+
   void swapBytes() {
-    v0::RootDescriptor::swapBytes();
+    v1::RootDescriptor::swapBytes();
     sys::swapByteOrder(Flags);
   }
 };
-} // namespace v1
-} // namespace RST0
+} // namespace v2
+} // namespace RTS0
 // following dx12 naming
 // https://learn.microsoft.com/en-us/windows/win32/api/d3d12/ns-d3d12-d3d12_root_constants
 struct RootConstants {
diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index 44e26c81eedc1..e3c4900ba175c 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -19,7 +19,7 @@ struct RootParameter {
   dxbc::RootParameterHeader Header;
   union {
     dxbc::RootConstants Constants;
-    dxbc::RST0::v1::RootDescriptor Descriptor;
+    dxbc::RTS0::v2::RootDescriptor Descriptor;
   };
 };
 struct RootSignatureDesc {
diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index e359d85f08bec..f23797149d377 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -17,6 +17,7 @@
 
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/Object/Error.h"
 #include "llvm/Support/Error.h"
@@ -124,16 +125,13 @@ struct RootParameterView {
   RootParameterView(uint32_t V, const dxbc::RootParameterHeader &H, StringRef P)
       : Header(H), ParamData(P) {}
 
-  template <typename T, typename VersionT = T> Expected<T> readParameter() {
-    assert(sizeof(VersionT) <= sizeof(T) &&
-           "Parameter of higher version must inherit all previous version data "
-           "members");
-    if (sizeof(VersionT) != ParamData.size())
+  template <typename T> Expected<T> readParameter() {
+    if (sizeof(T) != ParamData.size())
       return make_error<GenericBinaryError>(
           "Reading structure out of file bounds", object_error::parse_failed);
 
     T Struct;
-    memcpy(&Struct, ParamData.data(), sizeof(VersionT));
+    memcpy(&Struct, ParamData.data(), sizeof(T));
     // DXContainer is always little endian
     if (sys::IsBigEndianHost)
       Struct.swapBytes();
@@ -162,11 +160,18 @@ struct RootDescriptorView : RootParameterView {
                 llvm::to_underlying(dxbc::RootParameterType::UAV));
   }
 
-  llvm::Expected<dxbc::RST0::v1::RootDescriptor> read(uint32_t Version) {
-    if (Version == 1)
-      return readParameter<dxbc::RST0::v1::RootDescriptor,
-                           dxbc::RST0::v0::RootDescriptor>();
-    return readParameter<dxbc::RST0::v1::RootDescriptor>();
+  llvm::Expected<dxbc::RTS0::v2::RootDescriptor> read(uint32_t Version) {
+    if (Version == 1) {
+      auto Descriptor = readParameter<dxbc::RTS0::v1::RootDescriptor>();
+      if (Error E = Descriptor.takeError())
+        return E;
+      return dxbc::RTS0::v2::RootDescriptor(*Descriptor);
+    }
+    if (Version != 2)
+      return make_error<GenericBinaryError>("Invalid Root Signature version: " +
+                                                Twine(Version),
+                                            object_error::parse_failed);
+    return readParameter<dxbc::RTS0::v2::RootDescriptor>();
   }
 };
 
@@ -217,9 +222,9 @@ class RootSignature {
     case dxbc::RootParameterType::SRV:
     case dxbc::RootParameterType::UAV:
       if (Version == 1)
-        DataSize = sizeof(dxbc::RST0::v0::RootDescriptor);
+        DataSize = sizeof(dxbc::RTS0::v1::RootDescriptor);
       else
-        DataSize = sizeof(dxbc::RST0::v1::RootDescriptor);
+        DataSize = sizeof(dxbc::RTS0::v2::RootDescriptor);
       break;
     }
     size_t EndOfSectionByte = getNumStaticSamplers() == 0
diff --git a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
index 8bb9da7884bed..d9d43b40db299 100644
--- a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
+++ b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
@@ -95,7 +95,7 @@ struct RootParameterYamlDesc {
   uint32_t Type;
   uint32_t Visibility;
   uint32_t Offset;
-  RootParameterYamlDesc(){};
+  RootParameterYamlDesc() {};
   RootParameterYamlDesc(uint32_t T) : Type(T) {
     switch (T) {
 
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 2693cb9943d5e..161711a79e467 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -41,9 +41,9 @@ size_t RootSignatureDesc::getSize() const {
     case llvm::to_underlying(dxbc::RootParameterType::SRV):
     case llvm::to_underlying(dxbc::RootParameterType::UAV):
       if (Version == 1)
-        Size += sizeof(dxbc::RST0::v0::RootDescriptor);
+        Size += sizeof(dxbc::RTS0::v1::RootDescriptor);
       else
-        Size += sizeof(dxbc::RST0::v1::RootDescriptor);
+        Size += sizeof(dxbc::RTS0::v2::RootDescriptor);
 
       break;
     }
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index 18c1299d4b867..4c681d80b3358 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -82,7 +82,7 @@ DXContainerYAML::RootSignatureYamlDesc::create(
       NewP.Constants.RegisterSpace = Constants.RegisterSpace;
     } else if (auto *RDV =
                    dyn_cast<object::DirectX::RootDescriptorView>(&ParamView)) {
-      llvm::Expected<dxbc::RST0::v1::RootDescriptor> DescriptorOrErr =
+      llvm::Expected<dxbc::RTS0::v2::RootDescriptor> DescriptorOrErr =
           RDV->read(Version);
       if (Error E = DescriptorOrErr.takeError())
         return std::move(E);

>From 1f3195784775b3244fd6c0d7447026d290605e85 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Thu, 8 May 2025 21:48:35 +0000
Subject: [PATCH 06/29] addressing comments

---
 llvm/include/llvm/Object/DXContainer.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index f23797149d377..c93c85e638f7b 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -25,6 +25,7 @@
 #include "llvm/TargetParser/Triple.h"
 #include <array>
 #include <cstddef>
+#include <cstdint>
 #include <variant>
 
 namespace llvm {
@@ -122,8 +123,10 @@ namespace DirectX {
 struct RootParameterView {
   const dxbc::RootParameterHeader &Header;
   StringRef ParamData;
+  uint32_t Version;
+
   RootParameterView(uint32_t V, const dxbc::RootParameterHeader &H, StringRef P)
-      : Header(H), ParamData(P) {}
+      : Header(H), ParamData(P), Version(V) {}
 
   template <typename T> Expected<T> readParameter() {
     if (sizeof(T) != ParamData.size())

>From e8fbfce6d9c761a640534e8d9ed731a5a4ac986a Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Thu, 8 May 2025 22:03:45 +0000
Subject: [PATCH 07/29] clean up

---
 llvm/include/llvm/Object/DXContainer.h         | 2 +-
 llvm/include/llvm/ObjectYAML/DXContainerYAML.h | 1 -
 llvm/lib/ObjectYAML/DXContainerYAML.cpp        | 1 -
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index c93c85e638f7b..985a4b0c49e5a 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -129,11 +129,11 @@ struct RootParameterView {
       : Header(H), ParamData(P), Version(V) {}
 
   template <typename T> Expected<T> readParameter() {
+    T Struct;
     if (sizeof(T) != ParamData.size())
       return make_error<GenericBinaryError>(
           "Reading structure out of file bounds", object_error::parse_failed);
 
-    T Struct;
     memcpy(&Struct, ParamData.data(), sizeof(T));
     // DXContainer is always little endian
     if (sys::IsBigEndianHost)
diff --git a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
index d9d43b40db299..73532fa392520 100644
--- a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
+++ b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
@@ -21,7 +21,6 @@
 #include "llvm/ObjectYAML/YAML.h"
 #include "llvm/Support/YAMLTraits.h"
 #include <array>
-#include <cstdint>
 #include <optional>
 #include <string>
 #include <vector>
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index 4c681d80b3358..8964c913946f2 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -15,7 +15,6 @@
 #include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/BinaryFormat/DXContainer.h"
-#include "llvm/Object/DXContainer.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/ScopedPrinter.h"
 #include <cstdint>

>From a31e5a5d14a2e81a411e30e2b50150a0ba85d409 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Fri, 9 May 2025 00:10:39 +0000
Subject: [PATCH 08/29] removing v parameter

---
 llvm/include/llvm/Object/DXContainer.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index 985a4b0c49e5a..61bfa9411cc57 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -123,10 +123,9 @@ namespace DirectX {
 struct RootParameterView {
   const dxbc::RootParameterHeader &Header;
   StringRef ParamData;
-  uint32_t Version;
 
-  RootParameterView(uint32_t V, const dxbc::RootParameterHeader &H, StringRef P)
-      : Header(H), ParamData(P), Version(V) {}
+  RootParameterView(const dxbc::RootParameterHeader &H, StringRef P)
+      : Header(H), ParamData(P) {}
 
   template <typename T> Expected<T> readParameter() {
     T Struct;
@@ -238,7 +237,7 @@ class RootSignature {
       return parseFailed("Reading structure out of file bounds");
 
     StringRef Buff = PartData.substr(Header.ParameterOffset, DataSize);
-    RootParameterView View = RootParameterView(Version, Header, Buff);
+    RootParameterView View = RootParameterView(Header, Buff);
     return View;
   }
 };

>From ad415a7a5a4ac5be41445f2d0527895b60e05d7b Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Fri, 9 May 2025 00:28:07 +0000
Subject: [PATCH 09/29] clean up

---
 llvm/include/llvm/MC/DXContainerRootSignature.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index 7489b7437ff69..b07d0f66e02a4 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -8,8 +8,7 @@
 
 #include "llvm/BinaryFormat/DXContainer.h"
 #include <cstdint>
-#include <optional>
-#include <utility>
+#include <limits>
 #include <variant>
 
 namespace llvm {

>From 98c6a5f2134ff4e55147c36aeb621a5e3b4ef367 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 14 May 2025 18:20:46 +0000
Subject: [PATCH 10/29] updating namespace naming

---
 llvm/include/llvm/BinaryFormat/DXContainer.h  | 16 ++++----
 .../llvm/MC/DXContainerRootSignature.h        | 40 +++++++++----------
 llvm/include/llvm/Object/DXContainer.h        | 36 ++++++++---------
 llvm/lib/MC/DXContainerRootSignature.cpp      | 40 +++++++++----------
 llvm/lib/Object/DXContainer.cpp               |  2 +-
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp    | 12 +++---
 llvm/lib/ObjectYAML/DXContainerYAML.cpp       | 14 +++----
 llvm/lib/Target/DirectX/DXILRootSignature.cpp | 10 ++---
 llvm/unittests/Object/DXContainerTest.cpp     |  4 +-
 9 files changed, 87 insertions(+), 87 deletions(-)

diff --git a/llvm/include/llvm/BinaryFormat/DXContainer.h b/llvm/include/llvm/BinaryFormat/DXContainer.h
index 98e30b1b6a8af..c18d1e3d7f024 100644
--- a/llvm/include/llvm/BinaryFormat/DXContainer.h
+++ b/llvm/include/llvm/BinaryFormat/DXContainer.h
@@ -600,7 +600,7 @@ inline bool isValidShaderVisibility(uint32_t V) {
   return false;
 }
 
-namespace v0 {
+namespace v1 {
 
 struct RootSignatureHeader {
   uint32_t Version;
@@ -667,25 +667,25 @@ struct DescriptorRange {
     sys::swapByteOrder(OffsetInDescriptorsFromTableStart);
   }
 };
-} // namespace v0
+} // namespace v1
 
-namespace v1 {
-struct RootDescriptor : public v0::RootDescriptor {
+namespace v2 {
+struct RootDescriptor : public v1::RootDescriptor {
   uint32_t Flags;
   void swapBytes() {
-    v0::RootDescriptor::swapBytes();
+    v1::RootDescriptor::swapBytes();
     sys::swapByteOrder(Flags);
   }
 };
 
-struct DescriptorRange : public v0::DescriptorRange {
+struct DescriptorRange : public v1::DescriptorRange {
   uint32_t Flags;
   void swapBytes() {
-    v0::DescriptorRange::swapBytes();
+    v1::DescriptorRange::swapBytes();
     sys::swapByteOrder(Flags);
   }
 };
-} // namespace v1
+} // namespace v2
 } // namespace RTS0
 // following dx12 naming
 // https://learn.microsoft.com/en-us/windows/win32/api/d3d12/ns-d3d12-d3d12_root_constants
diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index 84f6421d8ad9d..caebf4716863b 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -21,16 +21,16 @@ class raw_ostream;
 namespace mcdxbc {
 
 struct RootParameterInfo {
-  dxbc::RTS0::v0::RootParameterHeader Header;
+  dxbc::RTS0::v1::RootParameterHeader Header;
   size_t Location;
 
   RootParameterInfo() = default;
 
-  RootParameterInfo(dxbc::RTS0::v0::RootParameterHeader H, size_t L)
+  RootParameterInfo(dxbc::RTS0::v1::RootParameterHeader H, size_t L)
       : Header(H), Location(L) {}
 };
-using DescriptorRanges = std::variant<dxbc::RTS0::v0::DescriptorRange,
-                                      dxbc::RTS0::v1::DescriptorRange>;
+using DescriptorRanges = std::variant<dxbc::RTS0::v1::DescriptorRange,
+                                      dxbc::RTS0::v2::DescriptorRange>;
 struct DescriptorTable {
   SmallVector<DescriptorRanges> Ranges;
 
@@ -42,42 +42,42 @@ struct DescriptorTable {
   }
 };
 
-using RootDescriptor = std::variant<dxbc::RTS0::v0::RootDescriptor,
-                                    dxbc::RTS0::v1::RootDescriptor>;
+using RootDescriptor = std::variant<dxbc::RTS0::v1::RootDescriptor,
+                                    dxbc::RTS0::v2::RootDescriptor>;
 
-using ParametersView = std::variant<const dxbc::RTS0::v0::RootConstants *,
-                                    const dxbc::RTS0::v0::RootDescriptor *,
+using ParametersView = std::variant<const dxbc::RTS0::v1::RootConstants *,
                                     const dxbc::RTS0::v1::RootDescriptor *,
+                                    const dxbc::RTS0::v2::RootDescriptor *,
                                     const DescriptorTable *>;
 struct RootParametersContainer {
   SmallVector<RootParameterInfo> ParametersInfo;
-  SmallVector<dxbc::RTS0::v0::RootConstants> Constants;
+  SmallVector<dxbc::RTS0::v1::RootConstants> Constants;
   SmallVector<RootDescriptor> Descriptors;
   SmallVector<DescriptorTable> Tables;
 
-  void addInfo(dxbc::RTS0::v0::RootParameterHeader H, size_t L) {
+  void addInfo(dxbc::RTS0::v1::RootParameterHeader H, size_t L) {
     ParametersInfo.push_back(RootParameterInfo(H, L));
   }
 
-  void addParameter(dxbc::RTS0::v0::RootParameterHeader H,
-                    dxbc::RTS0::v0::RootConstants C) {
+  void addParameter(dxbc::RTS0::v1::RootParameterHeader H,
+                    dxbc::RTS0::v1::RootConstants C) {
     addInfo(H, Constants.size());
     Constants.push_back(C);
   }
 
-  void addParameter(dxbc::RTS0::v0::RootParameterHeader H,
-                    dxbc::RTS0::v0::RootDescriptor D) {
+  void addParameter(dxbc::RTS0::v1::RootParameterHeader H,
+                    dxbc::RTS0::v1::RootDescriptor D) {
     addInfo(H, Descriptors.size());
     Descriptors.push_back(D);
   }
 
-  void addParameter(dxbc::RTS0::v0::RootParameterHeader H,
-                    dxbc::RTS0::v1::RootDescriptor D) {
+  void addParameter(dxbc::RTS0::v1::RootParameterHeader H,
+                    dxbc::RTS0::v2::RootDescriptor D) {
     addInfo(H, Descriptors.size());
     Descriptors.push_back(D);
   }
 
-  void addParameter(dxbc::RTS0::v0::RootParameterHeader H, DescriptorTable D) {
+  void addParameter(dxbc::RTS0::v1::RootParameterHeader H, DescriptorTable D) {
     addInfo(H, Tables.size());
     Tables.push_back(D);
   }
@@ -90,11 +90,11 @@ struct RootParametersContainer {
     case llvm::to_underlying(dxbc::RTS0::RootParameterType::SRV):
     case llvm::to_underlying(dxbc::RTS0::RootParameterType::UAV): {
       const RootDescriptor &VersionedParam = Descriptors[H->Location];
-      if (std::holds_alternative<dxbc::RTS0::v0::RootDescriptor>(
+      if (std::holds_alternative<dxbc::RTS0::v1::RootDescriptor>(
               VersionedParam)) {
-        return &std::get<dxbc::RTS0::v0::RootDescriptor>(VersionedParam);
+        return &std::get<dxbc::RTS0::v1::RootDescriptor>(VersionedParam);
       }
-      return &std::get<dxbc::RTS0::v1::RootDescriptor>(VersionedParam);
+      return &std::get<dxbc::RTS0::v2::RootDescriptor>(VersionedParam);
     }
     case llvm::to_underlying(dxbc::RTS0::RootParameterType::DescriptorTable):
       return &Tables[H->Location];
diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index 3e32870c5fb8f..a4b1f91cd16ff 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -120,11 +120,11 @@ template <typename T> struct ViewArray {
 
 namespace DirectX {
 struct RootParameterView {
-  const dxbc::RTS0::v0::RootParameterHeader &Header;
+  const dxbc::RTS0::v1::RootParameterHeader &Header;
   StringRef ParamData;
   uint32_t Version;
 
-  RootParameterView(uint32_t V, const dxbc::RTS0::v0::RootParameterHeader &H,
+  RootParameterView(uint32_t V, const dxbc::RTS0::v1::RootParameterHeader &H,
                     StringRef P)
       : Header(H), ParamData(P), Version(V) {}
 
@@ -151,8 +151,8 @@ struct RootConstantView : RootParameterView {
            (uint32_t)dxbc::RTS0::RootParameterType::Constants32Bit;
   }
 
-  llvm::Expected<dxbc::RTS0::v0::RootConstants> read() {
-    return readParameter<dxbc::RTS0::v0::RootConstants>();
+  llvm::Expected<dxbc::RTS0::v1::RootConstants> read() {
+    return readParameter<dxbc::RTS0::v1::RootConstants>();
   }
 };
 
@@ -166,11 +166,11 @@ struct RootDescriptorView : RootParameterView {
                 llvm::to_underlying(dxbc::RTS0::RootParameterType::UAV));
   }
 
-  llvm::Expected<dxbc::RTS0::v1::RootDescriptor> read(uint32_t Version) {
+  llvm::Expected<dxbc::RTS0::v2::RootDescriptor> read(uint32_t Version) {
     if (Version == 1)
-      return readParameter<dxbc::RTS0::v1::RootDescriptor,
-                           dxbc::RTS0::v0::RootDescriptor>();
-    return readParameter<dxbc::RTS0::v1::RootDescriptor>();
+      return readParameter<dxbc::RTS0::v2::RootDescriptor,
+                           dxbc::RTS0::v1::RootDescriptor>();
+    return readParameter<dxbc::RTS0::v2::RootDescriptor>();
   }
 };
 template <typename T> struct DescriptorTable {
@@ -187,11 +187,11 @@ template <typename T> struct TemplateTypeToVersion {
   static constexpr uint32_t Value = -1;
 };
 
-template <> struct TemplateTypeToVersion<dxbc::RTS0::v0::DescriptorRange> {
+template <> struct TemplateTypeToVersion<dxbc::RTS0::v1::DescriptorRange> {
   static constexpr uint32_t Value = 1;
 };
 
-template <> struct TemplateTypeToVersion<dxbc::RTS0::v1::DescriptorRange> {
+template <> struct TemplateTypeToVersion<dxbc::RTS0::v2::DescriptorRange> {
   static constexpr uint32_t Value = 2;
 };
 
@@ -236,11 +236,11 @@ class RootSignature {
   uint32_t NumStaticSamplers;
   uint32_t StaticSamplersOffset;
   uint32_t Flags;
-  ViewArray<dxbc::RTS0::v0::RootParameterHeader> ParametersHeaders;
+  ViewArray<dxbc::RTS0::v1::RootParameterHeader> ParametersHeaders;
   StringRef PartData;
 
   using param_header_iterator =
-      ViewArray<dxbc::RTS0::v0::RootParameterHeader>::iterator;
+      ViewArray<dxbc::RTS0::v1::RootParameterHeader>::iterator;
 
 public:
   RootSignature(StringRef PD) : PartData(PD) {}
@@ -258,7 +258,7 @@ class RootSignature {
   uint32_t getFlags() const { return Flags; }
 
   llvm::Expected<RootParameterView>
-  getParameter(const dxbc::RTS0::v0::RootParameterHeader &Header) const {
+  getParameter(const dxbc::RTS0::v1::RootParameterHeader &Header) const {
     size_t DataSize;
 
     if (!dxbc::RTS0::isValidParameterType(Header.ParameterType))
@@ -266,25 +266,25 @@ class RootSignature {
 
     switch (static_cast<dxbc::RTS0::RootParameterType>(Header.ParameterType)) {
     case dxbc::RTS0::RootParameterType::Constants32Bit:
-      DataSize = sizeof(dxbc::RTS0::v0::RootConstants);
+      DataSize = sizeof(dxbc::RTS0::v1::RootConstants);
       break;
     case dxbc::RTS0::RootParameterType::CBV:
     case dxbc::RTS0::RootParameterType::SRV:
     case dxbc::RTS0::RootParameterType::UAV:
       if (Version == 1)
-        DataSize = sizeof(dxbc::RTS0::v0::RootDescriptor);
-      else
         DataSize = sizeof(dxbc::RTS0::v1::RootDescriptor);
+      else
+        DataSize = sizeof(dxbc::RTS0::v2::RootDescriptor);
       break;
     case dxbc::RTS0::RootParameterType::DescriptorTable:
       uint32_t NumRanges =
           support::endian::read<uint32_t, llvm::endianness::little>(
               PartData.begin() + Header.ParameterOffset);
       if (Version == 1)
-        DataSize = sizeof(dxbc::RTS0::v0::DescriptorRange) * NumRanges +
+        DataSize = sizeof(dxbc::RTS0::v1::DescriptorRange) * NumRanges +
                    2 * sizeof(uint32_t);
       else
-        DataSize = sizeof(dxbc::RTS0::v1::DescriptorRange) * NumRanges +
+        DataSize = sizeof(dxbc::RTS0::v2::DescriptorRange) * NumRanges +
                    2 * sizeof(uint32_t);
       break;
     }
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 352a8d3a9c603..1da4910f3a3db 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -21,25 +21,25 @@ class SizeCalculatorVisitor {
   SizeCalculatorVisitor(uint32_t Version, size_t &SizeRef)
       : Size(SizeRef), Version(Version) {}
 
-  void operator()(const dxbc::RTS0::v0::RootConstants *Value) const {
-    Size += sizeof(dxbc::RTS0::v0::RootConstants);
-  }
-
-  void operator()(const dxbc::RTS0::v0::RootDescriptor *Value) const {
-    Size += sizeof(dxbc::RTS0::v0::RootDescriptor);
+  void operator()(const dxbc::RTS0::v1::RootConstants *Value) const {
+    Size += sizeof(dxbc::RTS0::v1::RootConstants);
   }
 
   void operator()(const dxbc::RTS0::v1::RootDescriptor *Value) const {
     Size += sizeof(dxbc::RTS0::v1::RootDescriptor);
   }
 
+  void operator()(const dxbc::RTS0::v2::RootDescriptor *Value) const {
+    Size += sizeof(dxbc::RTS0::v2::RootDescriptor);
+  }
+
   void operator()(const DescriptorTable *Value) const {
     if (Version == 1)
       Size +=
-          sizeof(dxbc::RTS0::v0::DescriptorRange) * Value->Ranges.size() + 8;
+          sizeof(dxbc::RTS0::v1::DescriptorRange) * Value->Ranges.size() + 8;
     else
       Size +=
-          sizeof(dxbc::RTS0::v1::DescriptorRange) * Value->Ranges.size() + 8;
+          sizeof(dxbc::RTS0::v2::DescriptorRange) * Value->Ranges.size() + 8;
   }
 
 private:
@@ -64,8 +64,8 @@ static void rewriteOffsetToCurrentByte(raw_svector_ostream &Stream,
 
 size_t RootSignatureDesc::getSize() const {
   size_t Size =
-      sizeof(dxbc::RTS0::v0::RootSignatureHeader) +
-      ParametersContainer.size() * sizeof(dxbc::RTS0::v0::RootParameterHeader);
+      sizeof(dxbc::RTS0::v1::RootSignatureHeader) +
+      ParametersContainer.size() * sizeof(dxbc::RTS0::v1::RootParameterHeader);
 
   for (const auto &I : ParametersContainer) {
     std::optional<ParametersView> P = ParametersContainer.getParameter(&I);
@@ -109,28 +109,28 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
     auto P = ParametersContainer.getParameter(H);
     if (!P)
       continue;
-    if (std::holds_alternative<const dxbc::RTS0::v0::RootConstants *>(
+    if (std::holds_alternative<const dxbc::RTS0::v1::RootConstants *>(
             P.value())) {
       auto *Constants =
-          std::get<const dxbc::RTS0::v0::RootConstants *>(P.value());
+          std::get<const dxbc::RTS0::v1::RootConstants *>(P.value());
       support::endian::write(BOS, Constants->ShaderRegister,
                              llvm::endianness::little);
       support::endian::write(BOS, Constants->RegisterSpace,
                              llvm::endianness::little);
       support::endian::write(BOS, Constants->Num32BitValues,
                              llvm::endianness::little);
-    } else if (std::holds_alternative<const dxbc::RTS0::v0::RootDescriptor *>(
+    } else if (std::holds_alternative<const dxbc::RTS0::v1::RootDescriptor *>(
                    *P)) {
       auto *Descriptor =
-          std::get<const dxbc::RTS0::v0::RootDescriptor *>(P.value());
+          std::get<const dxbc::RTS0::v1::RootDescriptor *>(P.value());
       support::endian::write(BOS, Descriptor->ShaderRegister,
                              llvm::endianness::little);
       support::endian::write(BOS, Descriptor->RegisterSpace,
                              llvm::endianness::little);
-    } else if (std::holds_alternative<const dxbc::RTS0::v1::RootDescriptor *>(
+    } else if (std::holds_alternative<const dxbc::RTS0::v2::RootDescriptor *>(
                    *P)) {
       auto *Descriptor =
-          std::get<const dxbc::RTS0::v1::RootDescriptor *>(P.value());
+          std::get<const dxbc::RTS0::v2::RootDescriptor *>(P.value());
 
       support::endian::write(BOS, Descriptor->ShaderRegister,
                              llvm::endianness::little);
@@ -144,8 +144,8 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       rewriteOffsetToCurrentByte(BOS, writePlaceholder(BOS));
       for (const auto &R : *Table) {
-        if (std::holds_alternative<dxbc::RTS0::v0::DescriptorRange>(R)) {
-          auto Range = std::get<dxbc::RTS0::v0::DescriptorRange>(R);
+        if (std::holds_alternative<dxbc::RTS0::v1::DescriptorRange>(R)) {
+          auto Range = std::get<dxbc::RTS0::v1::DescriptorRange>(R);
 
           support::endian::write(BOS, Range.RangeType,
                                  llvm::endianness::little);
@@ -158,8 +158,8 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
           support::endian::write(BOS, Range.OffsetInDescriptorsFromTableStart,
                                  llvm::endianness::little);
         } else {
-          if (std::holds_alternative<dxbc::RTS0::v1::DescriptorRange>(R)) {
-            auto Range = std::get<dxbc::RTS0::v1::DescriptorRange>(R);
+          if (std::holds_alternative<dxbc::RTS0::v2::DescriptorRange>(R)) {
+            auto Range = std::get<dxbc::RTS0::v2::DescriptorRange>(R);
 
             support::endian::write(BOS, Range.RangeType,
                                    llvm::endianness::little);
diff --git a/llvm/lib/Object/DXContainer.cpp b/llvm/lib/Object/DXContainer.cpp
index f4617bd87e0f7..2d05566626bfc 100644
--- a/llvm/lib/Object/DXContainer.cpp
+++ b/llvm/lib/Object/DXContainer.cpp
@@ -274,7 +274,7 @@ Error DirectX::RootSignature::parse() {
 
   ParametersHeaders.Data = PartData.substr(
       RootParametersOffset,
-      NumParameters * sizeof(dxbc::RTS0::v0::RootParameterHeader));
+      NumParameters * sizeof(dxbc::RTS0::v1::RootParameterHeader));
 
   return Error::success();
 }
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index e24d5cb528389..66aad157cd5c2 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -277,7 +277,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
       RS.StaticSamplersOffset = P.RootSignature->StaticSamplersOffset;
 
       for (const auto &Param : P.RootSignature->Parameters) {
-        auto Header = dxbc::RTS0::v0::RootParameterHeader{
+        auto Header = dxbc::RTS0::v1::RootParameterHeader{
             Param.Type, Param.Visibility, Param.Offset};
 
         if (std::holds_alternative<DXContainerYAML::RootConstantsYaml>(
@@ -285,7 +285,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
           auto ConstantYaml =
               std::get<DXContainerYAML::RootConstantsYaml>(Param.Data);
 
-          dxbc::RTS0::v0::RootConstants Constants;
+          dxbc::RTS0::v1::RootConstants Constants;
           Constants.Num32BitValues = ConstantYaml.Num32BitValues;
           Constants.RegisterSpace = ConstantYaml.RegisterSpace;
           Constants.ShaderRegister = ConstantYaml.ShaderRegister;
@@ -296,12 +296,12 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
               std::get<DXContainerYAML::RootDescriptorYaml>(Param.Data);
 
           if (RS.Version == 1) {
-            dxbc::RTS0::v0::RootDescriptor Descriptor;
+            dxbc::RTS0::v1::RootDescriptor Descriptor;
             Descriptor.RegisterSpace = DescriptorYaml.RegisterSpace;
             Descriptor.ShaderRegister = DescriptorYaml.ShaderRegister;
             RS.ParametersContainer.addParameter(Header, Descriptor);
           } else {
-            dxbc::RTS0::v1::RootDescriptor Descriptor;
+            dxbc::RTS0::v2::RootDescriptor Descriptor;
             Descriptor.RegisterSpace = DescriptorYaml.RegisterSpace;
             Descriptor.ShaderRegister = DescriptorYaml.ShaderRegister;
             Descriptor.Flags = DescriptorYaml.getEncodedFlags();
@@ -315,7 +315,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
 
           for (const auto &R : TableYaml.Ranges) {
             if (RS.Version == 1) {
-              dxbc::RTS0::v0::DescriptorRange Range;
+              dxbc::RTS0::v1::DescriptorRange Range;
               Range.RangeType = R.RangeType;
               Range.NumDescriptors = R.NumDescriptors;
               Range.BaseShaderRegister = R.BaseShaderRegister;
@@ -324,7 +324,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
                   R.OffsetInDescriptorsFromTableStart;
               Table.Ranges.push_back(Range);
             } else {
-              dxbc::RTS0::v1::DescriptorRange Range;
+              dxbc::RTS0::v2::DescriptorRange Range;
               Range.RangeType = R.RangeType;
               Range.NumDescriptors = R.NumDescriptors;
               Range.BaseShaderRegister = R.BaseShaderRegister;
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index f61ef9dc3e2ef..8656fc288e92a 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -48,7 +48,7 @@ DXContainerYAML::RootSignatureYamlDesc::create(
   RootSigDesc.RootParametersOffset = Data.getRootParametersOffset();
 
   uint32_t Flags = Data.getFlags();
-  for (const dxbc::RTS0::v0::RootParameterHeader &PH : Data.param_headers()) {
+  for (const dxbc::RTS0::v1::RootParameterHeader &PH : Data.param_headers()) {
 
     if (!dxbc::RTS0::isValidParameterType(PH.ParameterType))
       return createStringError(std::errc::invalid_argument,
@@ -71,7 +71,7 @@ DXContainerYAML::RootSignatureYamlDesc::create(
     object::DirectX::RootParameterView ParamView = ParamViewOrErr.get();
 
     if (auto *RCV = dyn_cast<object::DirectX::RootConstantView>(&ParamView)) {
-      llvm::Expected<dxbc::RTS0::v0::RootConstants> ConstantsOrErr =
+      llvm::Expected<dxbc::RTS0::v1::RootConstants> ConstantsOrErr =
           RCV->read();
       if (Error E = ConstantsOrErr.takeError())
         return std::move(E);
@@ -84,7 +84,7 @@ DXContainerYAML::RootSignatureYamlDesc::create(
       NewP.Data = ConstantYaml;
     } else if (auto *RDV =
                    dyn_cast<object::DirectX::RootDescriptorView>(&ParamView)) {
-      llvm::Expected<dxbc::RTS0::v1::RootDescriptor> DescriptorOrErr =
+      llvm::Expected<dxbc::RTS0::v2::RootDescriptor> DescriptorOrErr =
           RDV->read(Version);
       if (Error E = DescriptorOrErr.takeError())
         return std::move(E);
@@ -101,9 +101,9 @@ DXContainerYAML::RootSignatureYamlDesc::create(
       }
       NewP.Data = YamlDescriptor;
     } else if (auto *TDV = dyn_cast<object::DirectX::DescriptorTableView<
-                   dxbc::RTS0::v0::DescriptorRange>>(&ParamView)) {
+                   dxbc::RTS0::v1::DescriptorRange>>(&ParamView)) {
       llvm::Expected<
-          object::DirectX::DescriptorTable<dxbc::RTS0::v0::DescriptorRange>>
+          object::DirectX::DescriptorTable<dxbc::RTS0::v1::DescriptorRange>>
           TableOrErr = TDV->read();
       if (Error E = TableOrErr.takeError())
         return std::move(E);
@@ -126,9 +126,9 @@ DXContainerYAML::RootSignatureYamlDesc::create(
       }
       NewP.Data = YamlTable;
     } else if (auto *TDV = dyn_cast<object::DirectX::DescriptorTableView<
-                   dxbc::RTS0::v1::DescriptorRange>>(&ParamView)) {
+                   dxbc::RTS0::v2::DescriptorRange>>(&ParamView)) {
       llvm::Expected<
-          object::DirectX::DescriptorTable<dxbc::RTS0::v1::DescriptorRange>>
+          object::DirectX::DescriptorTable<dxbc::RTS0::v2::DescriptorRange>>
           TableOrErr = TDV->read();
       if (Error E = TableOrErr.takeError())
         return std::move(E);
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index ddd3bd11c3ab0..f3c6835822a32 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -76,7 +76,7 @@ static bool parseRootConstants(LLVMContext *Ctx, mcdxbc::RootSignatureDesc &RSD,
   if (RootConstantNode->getNumOperands() != 5)
     return reportError(Ctx, "Invalid format for RootConstants Element");
 
-  dxbc::RTS0::v0::RootParameterHeader Header;
+  dxbc::RTS0::v1::RootParameterHeader Header;
   Header.ParameterType =
       llvm::to_underlying(dxbc::RTS0::RootParameterType::Constants32Bit);
 
@@ -85,7 +85,7 @@ static bool parseRootConstants(LLVMContext *Ctx, mcdxbc::RootSignatureDesc &RSD,
   else
     return reportError(Ctx, "Invalid value for ShaderVisibility");
 
-  dxbc::RTS0::v0::RootConstants Constants;
+  dxbc::RTS0::v1::RootConstants Constants;
   if (std::optional<uint32_t> Val = extractMdIntValue(RootConstantNode, 2))
     Constants.ShaderRegister = *Val;
   else
@@ -246,7 +246,7 @@ analyzeModule(Module &M) {
     // Clang emits the root signature data in dxcontainer following a specific
     // sequence. First the header, then the root parameters. So the header
     // offset will always equal to the header size.
-    RSD.RootParameterOffset = sizeof(dxbc::RTS0::v0::RootSignatureHeader);
+    RSD.RootParameterOffset = sizeof(dxbc::RTS0::v1::RootSignatureHeader);
 
     if (parse(Ctx, RSD, RootElementListNode) || validate(Ctx, RSD)) {
       return RSDMap;
@@ -301,8 +301,8 @@ PreservedAnalyses RootSignatureAnalysisPrinter::run(Module &M,
           RS.ParametersContainer.getParameter(&Info);
       if (!P)
         continue;
-      if (std::holds_alternative<const dxbc::RTS0::v0::RootConstants *>(*P)) {
-        auto *Constants = std::get<const dxbc::RTS0::v0::RootConstants *>(*P);
+      if (std::holds_alternative<const dxbc::RTS0::v1::RootConstants *>(*P)) {
+        auto *Constants = std::get<const dxbc::RTS0::v1::RootConstants *>(*P);
         OS << indent(Space + 2)
            << "Register Space: " << Constants->RegisterSpace << "\n";
         OS << indent(Space + 2)
diff --git a/llvm/unittests/Object/DXContainerTest.cpp b/llvm/unittests/Object/DXContainerTest.cpp
index 602aae875a283..d2c4e5bb91ee9 100644
--- a/llvm/unittests/Object/DXContainerTest.cpp
+++ b/llvm/unittests/Object/DXContainerTest.cpp
@@ -1086,7 +1086,7 @@ TEST(RootSignature, ParseDescriptorTable) {
     ASSERT_THAT_ERROR(ParamView.takeError(), Succeeded());
 
     auto *DescriptorTableView =
-        dyn_cast<DirectX::DescriptorTableView<dxbc::RTS0::v1::DescriptorRange>>(
+        dyn_cast<DirectX::DescriptorTableView<dxbc::RTS0::v2::DescriptorRange>>(
             &*ParamView);
     ASSERT_TRUE(DescriptorTableView != nullptr);
     auto Table = DescriptorTableView->read();
@@ -1139,7 +1139,7 @@ TEST(RootSignature, ParseDescriptorTable) {
     ASSERT_THAT_ERROR(ParamView.takeError(), Succeeded());
 
     auto *DescriptorTableView =
-        dyn_cast<DirectX::DescriptorTableView<dxbc::RTS0::v0::DescriptorRange>>(
+        dyn_cast<DirectX::DescriptorTableView<dxbc::RTS0::v1::DescriptorRange>>(
             &*ParamView);
     ASSERT_TRUE(DescriptorTableView != nullptr);
     auto Table = DescriptorTableView->read();

>From d67f7d3f528e5e2bf476444dfa32a7d4433ecf07 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 14 May 2025 22:19:07 +0000
Subject: [PATCH 11/29] addressing comment

---
 .../llvm/MC/DXContainerRootSignature.h        | 39 +++++------
 .../include/llvm/ObjectYAML/DXContainerYAML.h |  2 +-
 llvm/lib/MC/DXContainerRootSignature.cpp      | 69 ++++++++++---------
 llvm/lib/Target/DirectX/DXILRootSignature.cpp | 40 ++++++-----
 4 files changed, 76 insertions(+), 74 deletions(-)

diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index b07d0f66e02a4..f02afddc8d57d 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -35,7 +35,7 @@ struct RootParametersContainer {
   SmallVector<RootParameterInfo> ParametersInfo;
 
   SmallVector<dxbc::RootConstants> Constants;
-  SmallVector<RootDescriptor> Descriptors;
+  SmallVector<dxbc::RTS0::v2::RootDescriptor> Descriptors;
 
   void addInfo(dxbc::RootParameterHeader H, size_t L) {
     ParametersInfo.push_back(RootParameterInfo(H, L));
@@ -47,33 +47,28 @@ struct RootParametersContainer {
   }
 
   void addParameter(dxbc::RootParameterHeader H,
-                    dxbc::RTS0::v1::RootDescriptor D) {
+                    dxbc::RTS0::v2::RootDescriptor D) {
     addInfo(H, Descriptors.size());
     Descriptors.push_back(D);
   }
 
-  void addParameter(dxbc::RootParameterHeader H,
-                    dxbc::RTS0::v2::RootDescriptor D) {
-    addInfo(H, Descriptors.size());
-    Descriptors.push_back(D);
+  const std::pair<uint32_t, uint32_t>
+  getTypeAndLocForParameter(uint32_t Index) const {
+    const RootParameterInfo &Info = ParametersInfo[Index];
+    return {Info.Header.ParameterType, Info.Location};
+  }
+
+  const dxbc::RootParameterHeader &getHeader(size_t Index) const {
+    const RootParameterInfo &Info = ParametersInfo[Index];
+    return Info.Header;
+  }
+
+  const dxbc::RootConstants &getConstant(size_t Index) const {
+    return Constants[Index];
   }
 
-  std::optional<ParametersView> getParameter(const RootParameterInfo *H) const {
-    switch (H->Header.ParameterType) {
-    case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
-      return &Constants[H->Location];
-    case llvm::to_underlying(dxbc::RootParameterType::CBV):
-    case llvm::to_underlying(dxbc::RootParameterType::SRV):
-    case llvm::to_underlying(dxbc::RootParameterType::UAV):
-      const RootDescriptor &VersionedParam = Descriptors[H->Location];
-      if (std::holds_alternative<dxbc::RTS0::v1::RootDescriptor>(
-              VersionedParam)) {
-        return &std::get<dxbc::RTS0::v1::RootDescriptor>(VersionedParam);
-      }
-      return &std::get<dxbc::RTS0::v2::RootDescriptor>(VersionedParam);
-    }
-
-    return std::nullopt;
+  const dxbc::RTS0::v2::RootDescriptor &getRootDescriptor(size_t Index) const {
+    return Descriptors[Index];
   }
 
   size_t size() const { return ParametersInfo.size(); }
diff --git a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
index 72bf5a9964a7d..73532fa392520 100644
--- a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
+++ b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
@@ -94,7 +94,7 @@ struct RootParameterYamlDesc {
   uint32_t Type;
   uint32_t Visibility;
   uint32_t Offset;
-  RootParameterYamlDesc(){};
+  RootParameterYamlDesc() {};
   RootParameterYamlDesc(uint32_t T) : Type(T) {
     switch (T) {
 
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 4980413472ede..f68f7cca752e1 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -7,7 +7,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/MC/DXContainerRootSignature.h"
+#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/ADT/SmallString.h"
+#include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/Support/EndianStream.h"
 
 using namespace llvm;
@@ -33,15 +35,20 @@ size_t RootSignatureDesc::getSize() const {
                 ParametersContainer.size() * sizeof(dxbc::RootParameterHeader);
 
   for (const auto &I : ParametersContainer) {
-    std::optional<ParametersView> P = ParametersContainer.getParameter(&I);
-    if (!P)
-      continue;
-    std::visit(
-        [&Size](auto &Value) -> void {
-          using T = std::decay_t<decltype(*Value)>;
-          Size += sizeof(T);
-        },
-        *P);
+    switch (I.Header.ParameterType) {
+    case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
+      Size += sizeof(dxbc::RootConstants);
+      break;
+    case llvm::to_underlying(dxbc::RootParameterType::CBV):
+    case llvm::to_underlying(dxbc::RootParameterType::SRV):
+    case llvm::to_underlying(dxbc::RootParameterType::UAV):
+      if (Version == 1)
+        Size += sizeof(dxbc::RTS0::v1::RootDescriptor);
+      else
+        Size += sizeof(dxbc::RTS0::v2::RootDescriptor);
+
+      break;
+    }
   }
 
   return Size;
@@ -62,7 +69,7 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
   support::endian::write(BOS, Flags, llvm::endianness::little);
 
   SmallVector<uint32_t> ParamsOffsets;
-  for (const auto &P : ParametersContainer) {
+  for (const RootParameterInfo &P : ParametersContainer) {
     support::endian::write(BOS, P.Header.ParameterType,
                            llvm::endianness::little);
     support::endian::write(BOS, P.Header.ShaderVisibility,
@@ -75,35 +82,31 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
   const RootParameterInfo *H = ParametersContainer.begin();
   for (size_t I = 0; I < NumParameters; ++I, H++) {
     rewriteOffsetToCurrentByte(BOS, ParamsOffsets[I]);
-    auto P = ParametersContainer.getParameter(H);
-    if (!P)
-      continue;
-    if (std::holds_alternative<const dxbc::RootConstants *>(P.value())) {
-      auto *Constants = std::get<const dxbc::RootConstants *>(P.value());
-      support::endian::write(BOS, Constants->ShaderRegister,
-                             llvm::endianness::little);
-      support::endian::write(BOS, Constants->RegisterSpace,
+    const auto &[Type, Loc] = ParametersContainer.getTypeAndLocForParameter(I);
+    switch (Type) {
+    case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit): {
+      const dxbc::RootConstants Constants =
+          ParametersContainer.getConstant(Loc);
+      support::endian::write(BOS, Constants.ShaderRegister,
                              llvm::endianness::little);
-      support::endian::write(BOS, Constants->Num32BitValues,
+      support::endian::write(BOS, Constants.RegisterSpace,
                              llvm::endianness::little);
-    } else if (std::holds_alternative<const dxbc::RTS0::v1::RootDescriptor *>(
-                   *P)) {
-      auto *Descriptor =
-          std::get<const dxbc::RTS0::v1::RootDescriptor *>(P.value());
-      support::endian::write(BOS, Descriptor->ShaderRegister,
+      support::endian::write(BOS, Constants.Num32BitValues,
                              llvm::endianness::little);
-      support::endian::write(BOS, Descriptor->RegisterSpace,
-                             llvm::endianness::little);
-    } else if (std::holds_alternative<const dxbc::RTS0::v2::RootDescriptor *>(
-                   *P)) {
-      auto *Descriptor =
-          std::get<const dxbc::RTS0::v2::RootDescriptor *>(P.value());
+    } break;
+    case llvm::to_underlying(dxbc::RootParameterType::CBV):
+    case llvm::to_underlying(dxbc::RootParameterType::SRV):
+    case llvm::to_underlying(dxbc::RootParameterType::UAV): {
+      const dxbc::RTS0::v2::RootDescriptor Descriptor =
+          ParametersContainer.getRootDescriptor(Loc);
 
-      support::endian::write(BOS, Descriptor->ShaderRegister,
+      support::endian::write(BOS, Descriptor.ShaderRegister,
                              llvm::endianness::little);
-      support::endian::write(BOS, Descriptor->RegisterSpace,
+      support::endian::write(BOS, Descriptor.RegisterSpace,
                              llvm::endianness::little);
-      support::endian::write(BOS, Descriptor->Flags, llvm::endianness::little);
+      if (Version > 1)
+        support::endian::write(BOS, Descriptor.Flags, llvm::endianness::little);
+    }
     }
   }
   assert(Storage.size() == getSize());
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index 1bd816b026fec..39083b6f1f757 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 #include "DXILRootSignature.h"
 #include "DirectX.h"
+#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Analysis/DXILMetadataAnalysis.h"
@@ -27,6 +28,7 @@
 #include "llvm/Support/Error.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
+#include <cstddef>
 #include <cstdint>
 #include <optional>
 #include <utility>
@@ -291,35 +293,37 @@ PreservedAnalyses RootSignatureAnalysisPrinter::run(Module &M,
     OS << indent(Space) << "NumParameters: " << RS.ParametersContainer.size()
        << "\n";
     Space++;
-    for (auto const &Info : RS.ParametersContainer) {
-      OS << indent(Space) << "- Parameter Type: " << Info.Header.ParameterType
-         << "\n";
+    for (size_t I = 0; I < RS.ParametersContainer.size(); I++) {
+      const auto &[Type, Loc] =
+          RS.ParametersContainer.getTypeAndLocForParameter(I);
+      const dxbc::RootParameterHeader Header =
+          RS.ParametersContainer.getHeader(I);
+
+      OS << indent(Space) << "- Parameter Type: " << Type << "\n";
       OS << indent(Space + 2)
-         << "Shader Visibility: " << Info.Header.ShaderVisibility << "\n";
-      std::optional<mcdxbc::ParametersView> P =
-          RS.ParametersContainer.getParameter(&Info);
-      if (!P)
-        continue;
-      if (std::holds_alternative<const dxbc::RootConstants *>(*P)) {
-        auto *Constants = std::get<const dxbc::RootConstants *>(*P);
-        OS << indent(Space + 2)
-           << "Register Space: " << Constants->RegisterSpace << "\n";
+         << "Shader Visibility: " << Header.ShaderVisibility << "\n";
+
+      switch (Type) {
+      case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit): {
+        auto Constants = RS.ParametersContainer.getConstant(Loc);
+        OS << indent(Space + 2) << "Register Space: " << Constants.RegisterSpace
+           << "\n";
         OS << indent(Space + 2)
-           << "Shader Register: " << Constants->ShaderRegister << "\n";
+           << "Shader Register: " << Constants.ShaderRegister << "\n";
         OS << indent(Space + 2)
-           << "Num 32 Bit Values: " << Constants->Num32BitValues << "\n";
+           << "Num 32 Bit Values: " << Constants.Num32BitValues << "\n";
+      }
       }
+      Space--;
     }
-    Space--;
     OS << indent(Space) << "NumStaticSamplers: " << 0 << "\n";
     OS << indent(Space) << "StaticSamplersOffset: " << RS.StaticSamplersOffset
        << "\n";
 
     Space--;
     // end root signature header
-  }
-
-  return PreservedAnalyses::all();
+}
+return PreservedAnalyses::all();
 }
 
 //===----------------------------------------------------------------------===//

>From 5453ad082730aca3b066408c25334bd9e1665335 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 14 May 2025 22:29:09 +0000
Subject: [PATCH 12/29] clean up

---
 llvm/include/llvm/MC/DXContainerRootSignature.h | 6 ------
 llvm/lib/MC/DXContainerRootSignature.cpp        | 2 --
 llvm/lib/Target/DirectX/DXILRootSignature.cpp   | 2 --
 3 files changed, 10 deletions(-)

diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index f02afddc8d57d..ca27a0f0379cc 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -9,7 +9,6 @@
 #include "llvm/BinaryFormat/DXContainer.h"
 #include <cstdint>
 #include <limits>
-#include <variant>
 
 namespace llvm {
 
@@ -26,11 +25,6 @@ struct RootParameterInfo {
       : Header(H), Location(L) {}
 };
 
-using RootDescriptor = std::variant<dxbc::RTS0::v1::RootDescriptor,
-                                    dxbc::RTS0::v2::RootDescriptor>;
-using ParametersView = std::variant<const dxbc::RootConstants *,
-                                    const dxbc::RTS0::v1::RootDescriptor *,
-                                    const dxbc::RTS0::v2::RootDescriptor *>;
 struct RootParametersContainer {
   SmallVector<RootParameterInfo> ParametersInfo;
 
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index f68f7cca752e1..ac061ebb4be33 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -7,9 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/MC/DXContainerRootSignature.h"
-#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/ADT/SmallString.h"
-#include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/Support/EndianStream.h"
 
 using namespace llvm;
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index 39083b6f1f757..8064c7c9511e6 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -12,7 +12,6 @@
 //===----------------------------------------------------------------------===//
 #include "DXILRootSignature.h"
 #include "DirectX.h"
-#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Analysis/DXILMetadataAnalysis.h"
@@ -28,7 +27,6 @@
 #include "llvm/Support/Error.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-#include <cstddef>
 #include <cstdint>
 #include <optional>
 #include <utility>

>From 836a8a8eb02bac84e6c5a222994c5c7a478dd4ae Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 14 May 2025 22:58:30 +0000
Subject: [PATCH 13/29] format

---
 llvm/lib/Target/DirectX/DXILRootSignature.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index 8064c7c9511e6..e39ba7b519161 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -320,8 +320,8 @@ PreservedAnalyses RootSignatureAnalysisPrinter::run(Module &M,
 
     Space--;
     // end root signature header
-}
-return PreservedAnalyses::all();
+  }
+  return PreservedAnalyses::all();
 }
 
 //===----------------------------------------------------------------------===//

>From 5bd57a645b6bdf8c3f0829d0cd4e79ffd93a5806 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 14 May 2025 23:04:18 +0000
Subject: [PATCH 14/29] adding comment

---
 llvm/lib/Target/DirectX/DXILRootSignature.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index e39ba7b519161..7545a9bc5304b 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -76,6 +76,8 @@ static bool parseRootConstants(LLVMContext *Ctx, mcdxbc::RootSignatureDesc &RSD,
     return reportError(Ctx, "Invalid format for RootConstants Element");
 
   dxbc::RootParameterHeader Header;
+  // this will be properly calculated when writing it.
+  Header.ParameterOffset = 0;
   Header.ParameterType =
       llvm::to_underlying(dxbc::RootParameterType::Constants32Bit);
 

>From 960cb9cdfef111ad7126e1250de676c66f8d7767 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 14 May 2025 23:19:54 +0000
Subject: [PATCH 15/29] adrresing comments

---
 llvm/lib/MC/DXContainerRootSignature.cpp      | 9 ++++-----
 llvm/lib/Target/DirectX/DXILRootSignature.cpp | 2 +-
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index ac061ebb4be33..6e2eaf5e6fdf8 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -77,13 +77,12 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
   }
 
   assert(NumParameters == ParamsOffsets.size());
-  const RootParameterInfo *H = ParametersContainer.begin();
-  for (size_t I = 0; I < NumParameters; ++I, H++) {
+  for (size_t I = 0; I < NumParameters; ++I) {
     rewriteOffsetToCurrentByte(BOS, ParamsOffsets[I]);
     const auto &[Type, Loc] = ParametersContainer.getTypeAndLocForParameter(I);
     switch (Type) {
     case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit): {
-      const dxbc::RootConstants Constants =
+      const dxbc::RootConstants &Constants =
           ParametersContainer.getConstant(Loc);
       support::endian::write(BOS, Constants.ShaderRegister,
                              llvm::endianness::little);
@@ -95,7 +94,7 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
     case llvm::to_underlying(dxbc::RootParameterType::CBV):
     case llvm::to_underlying(dxbc::RootParameterType::SRV):
     case llvm::to_underlying(dxbc::RootParameterType::UAV): {
-      const dxbc::RTS0::v2::RootDescriptor Descriptor =
+      const dxbc::RTS0::v2::RootDescriptor &Descriptor =
           ParametersContainer.getRootDescriptor(Loc);
 
       support::endian::write(BOS, Descriptor.ShaderRegister,
@@ -104,7 +103,7 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       if (Version > 1)
         support::endian::write(BOS, Descriptor.Flags, llvm::endianness::little);
-    }
+    } break ;
     }
   }
   assert(Storage.size() == getSize());
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index 7545a9bc5304b..7e33329eb0219 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -305,7 +305,7 @@ PreservedAnalyses RootSignatureAnalysisPrinter::run(Module &M,
 
       switch (Type) {
       case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit): {
-        auto Constants = RS.ParametersContainer.getConstant(Loc);
+        const dxbc::RootConstants &Constants = RS.ParametersContainer.getConstant(Loc);
         OS << indent(Space + 2) << "Register Space: " << Constants.RegisterSpace
            << "\n";
         OS << indent(Space + 2)

>From a60c7a3b2a66a571f09982cd32f74d4bf24e751e Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 14 May 2025 23:26:31 +0000
Subject: [PATCH 16/29] clean up

---
 llvm/lib/MC/DXContainerRootSignature.cpp      | 3 +--
 llvm/lib/Target/DirectX/DXILRootSignature.cpp | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 6e2eaf5e6fdf8..00d04f6f2a767 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -32,7 +32,7 @@ size_t RootSignatureDesc::getSize() const {
   size_t Size = sizeof(dxbc::RootSignatureHeader) +
                 ParametersContainer.size() * sizeof(dxbc::RootParameterHeader);
 
-  for (const auto &I : ParametersContainer) {
+  for (const RootParameterInfo &I : ParametersContainer) {
     switch (I.Header.ParameterType) {
     case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
       Size += sizeof(dxbc::RootConstants);
@@ -48,7 +48,6 @@ size_t RootSignatureDesc::getSize() const {
       break;
     }
   }
-
   return Size;
 }
 
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index 7e33329eb0219..f69ebf423f311 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -167,7 +167,7 @@ static bool validate(LLVMContext *Ctx, const mcdxbc::RootSignatureDesc &RSD) {
     return reportValueError(Ctx, "RootFlags", RSD.Flags);
   }
 
-  for (const llvm::mcdxbc::RootParameterInfo &Info : RSD.ParametersContainer) {
+  for (const mcdxbc::RootParameterInfo &Info : RSD.ParametersContainer) {
     if (!dxbc::isValidShaderVisibility(Info.Header.ShaderVisibility))
       return reportValueError(Ctx, "ShaderVisibility",
                               Info.Header.ShaderVisibility);

>From 2a4c2cb1f23936e39ab38702283d442c33d028d9 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Thu, 15 May 2025 00:26:05 +0000
Subject: [PATCH 17/29] formatting

---
 llvm/lib/MC/DXContainerRootSignature.cpp      | 2 +-
 llvm/lib/Target/DirectX/DXILRootSignature.cpp | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 00d04f6f2a767..262c81c72d6b0 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -102,7 +102,7 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       if (Version > 1)
         support::endian::write(BOS, Descriptor.Flags, llvm::endianness::little);
-    } break ;
+    } break;
     }
   }
   assert(Storage.size() == getSize());
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index f69ebf423f311..aca0104b53c1f 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -305,7 +305,8 @@ PreservedAnalyses RootSignatureAnalysisPrinter::run(Module &M,
 
       switch (Type) {
       case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit): {
-        const dxbc::RootConstants &Constants = RS.ParametersContainer.getConstant(Loc);
+        const dxbc::RootConstants &Constants =
+            RS.ParametersContainer.getConstant(Loc);
         OS << indent(Space + 2) << "Register Space: " << Constants.RegisterSpace
            << "\n";
         OS << indent(Space + 2)

>From c29d3f2cddf20d0a4af8c42b2da16d5d400be878 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Thu, 15 May 2025 17:26:54 +0000
Subject: [PATCH 18/29] addressing comments

---
 llvm/include/llvm/BinaryFormat/DXContainer.h  |  2 +-
 .../llvm/MC/DXContainerRootSignature.h        | 35 +++++++++++--------
 llvm/lib/MC/DXContainerRootSignature.cpp      |  6 ++--
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp    | 22 +++++-------
 llvm/lib/Target/DirectX/DXILRootSignature.cpp |  4 +--
 5 files changed, 35 insertions(+), 34 deletions(-)

diff --git a/llvm/include/llvm/BinaryFormat/DXContainer.h b/llvm/include/llvm/BinaryFormat/DXContainer.h
index 4fbc0cf1e5954..82890bf814935 100644
--- a/llvm/include/llvm/BinaryFormat/DXContainer.h
+++ b/llvm/include/llvm/BinaryFormat/DXContainer.h
@@ -602,7 +602,7 @@ struct RootDescriptor : public v1::RootDescriptor {
   uint32_t Flags;
 
   RootDescriptor() = default;
-  RootDescriptor(v1::RootDescriptor &Base)
+  explicit RootDescriptor(v1::RootDescriptor &Base)
       : v1::RootDescriptor(Base), Flags(0u) {}
 
   void swapBytes() {
diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index ca27a0f0379cc..3496b5fff398f 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -21,8 +21,8 @@ struct RootParameterInfo {
 
   RootParameterInfo() = default;
 
-  RootParameterInfo(dxbc::RootParameterHeader H, size_t L)
-      : Header(H), Location(L) {}
+  RootParameterInfo(dxbc::RootParameterHeader Header, size_t Location)
+      : Header(Header), Location(Location) {}
 };
 
 struct RootParametersContainer {
@@ -31,29 +31,34 @@ struct RootParametersContainer {
   SmallVector<dxbc::RootConstants> Constants;
   SmallVector<dxbc::RTS0::v2::RootDescriptor> Descriptors;
 
-  void addInfo(dxbc::RootParameterHeader H, size_t L) {
-    ParametersInfo.push_back(RootParameterInfo(H, L));
+  void addInfo(dxbc::RootParameterHeader Header, size_t Location) {
+    ParametersInfo.push_back(RootParameterInfo(Header, Location));
   }
 
-  void addParameter(dxbc::RootParameterHeader H, dxbc::RootConstants C) {
-    addInfo(H, Constants.size());
-    Constants.push_back(C);
+  void addParameter(dxbc::RootParameterHeader Header,
+                    dxbc::RootConstants Constant) {
+    addInfo(Header, Constants.size());
+    Constants.push_back(Constant);
   }
 
-  void addParameter(dxbc::RootParameterHeader H,
-                    dxbc::RTS0::v2::RootDescriptor D) {
-    addInfo(H, Descriptors.size());
-    Descriptors.push_back(D);
+  void addInvalidParameter(dxbc::RootParameterHeader Header) {
+    addInfo(Header, -1);
+  }
+
+  void addParameter(dxbc::RootParameterHeader Header,
+                    dxbc::RTS0::v2::RootDescriptor Descriptor) {
+    addInfo(Header, Descriptors.size());
+    Descriptors.push_back(Descriptor);
   }
 
   const std::pair<uint32_t, uint32_t>
-  getTypeAndLocForParameter(uint32_t Index) const {
-    const RootParameterInfo &Info = ParametersInfo[Index];
+  getTypeAndLocForParameter(uint32_t Location) const {
+    const RootParameterInfo &Info = ParametersInfo[Location];
     return {Info.Header.ParameterType, Info.Location};
   }
 
-  const dxbc::RootParameterHeader &getHeader(size_t Index) const {
-    const RootParameterInfo &Info = ParametersInfo[Index];
+  const dxbc::RootParameterHeader &getHeader(size_t Location) const {
+    const RootParameterInfo &Info = ParametersInfo[Location];
     return Info.Header;
   }
 
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 262c81c72d6b0..a9394541d18da 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -89,7 +89,8 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       support::endian::write(BOS, Constants.Num32BitValues,
                              llvm::endianness::little);
-    } break;
+      break;
+    }
     case llvm::to_underlying(dxbc::RootParameterType::CBV):
     case llvm::to_underlying(dxbc::RootParameterType::SRV):
     case llvm::to_underlying(dxbc::RootParameterType::UAV): {
@@ -102,7 +103,8 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       if (Version > 1)
         support::endian::write(BOS, Descriptor.Flags, llvm::endianness::little);
-    } break;
+      break;
+    }
     }
   }
   assert(Storage.size() == getSize());
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index dabc23380fa02..c00cd3e08d59d 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -274,8 +274,8 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
       RS.StaticSamplersOffset = P.RootSignature->StaticSamplersOffset;
 
       for (const auto &Param : P.RootSignature->Parameters) {
-        auto Header = dxbc::RootParameterHeader{Param.Type, Param.Visibility,
-                                                Param.Offset};
+        dxbc::RootParameterHeader Header{Param.Type, Param.Visibility,
+                                         Param.Offset};
 
         switch (Param.Type) {
         case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
@@ -288,24 +288,18 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
         case llvm::to_underlying(dxbc::RootParameterType::SRV):
         case llvm::to_underlying(dxbc::RootParameterType::UAV):
         case llvm::to_underlying(dxbc::RootParameterType::CBV):
-          if (RS.Version == 1) {
-            dxbc::RTS0::v1::RootDescriptor Descriptor;
-            Descriptor.RegisterSpace = Param.Descriptor.RegisterSpace;
-            Descriptor.ShaderRegister = Param.Descriptor.ShaderRegister;
-            RS.ParametersContainer.addParameter(Header, Descriptor);
-          } else {
-            dxbc::RTS0::v2::RootDescriptor Descriptor;
-            Descriptor.RegisterSpace = Param.Descriptor.RegisterSpace;
-            Descriptor.ShaderRegister = Param.Descriptor.ShaderRegister;
+          dxbc::RTS0::v2::RootDescriptor Descriptor;
+          Descriptor.RegisterSpace = Param.Descriptor.RegisterSpace;
+          Descriptor.ShaderRegister = Param.Descriptor.ShaderRegister;
+          if (RS.Version > 1)
             Descriptor.Flags = Param.Descriptor.getEncodedFlags();
-            RS.ParametersContainer.addParameter(Header, Descriptor);
-          }
+          RS.ParametersContainer.addParameter(Header, Descriptor);
           break;
         default:
           // Handling invalid parameter type edge case. We intentionally let
           // obj2yaml/yaml2obj parse and emit invalid dxcontainer data, in order
           // for that to be used as a testing tool more effectively.
-          RS.ParametersContainer.addInfo(Header, -1);
+          RS.ParametersContainer.addInvalidParameter(Header);
         }
       }
 
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index aca0104b53c1f..43e06ee278b49 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -76,8 +76,8 @@ static bool parseRootConstants(LLVMContext *Ctx, mcdxbc::RootSignatureDesc &RSD,
     return reportError(Ctx, "Invalid format for RootConstants Element");
 
   dxbc::RootParameterHeader Header;
-  // this will be properly calculated when writing it.
-  Header.ParameterOffset = 0;
+  // The parameter offset doesn't matter here - we recalculate it during
+  // serialization  Header.ParameterOffset = 0;
   Header.ParameterType =
       llvm::to_underlying(dxbc::RootParameterType::Constants32Bit);
 

>From eb97f1b60fdee91cf524aa7ceb51bf1970c2c803 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Fri, 16 May 2025 20:35:10 +0000
Subject: [PATCH 19/29] fixing test issues

---
 llvm/include/llvm/Object/DXContainer.h  | 1 +
 llvm/lib/ObjectYAML/DXContainerYAML.cpp | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index 27d7ee0c94d91..8908719640e63 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -211,6 +211,7 @@ struct DescriptorTableView : RootParameterView {
     if(Version > 1)
       RangeSize = sizeof(dxbc::RTS0::v2::DescriptorRange);
 
+    Table.Ranges.Stride = RangeSize;
     Table.Ranges.Data =
         ParamData.substr(2 * sizeof(uint32_t), Table.NumRanges * RangeSize);
     return Table;
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index ce3aaf2bfac1f..830d5ea46459c 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -117,8 +117,8 @@ DXContainerYAML::RootSignatureYamlDesc::create(
   NewR.Val =                                                                   \
       (R.Flags & llvm::to_underlying(dxbc::DescriptorRangeFlag::Val)) > 0;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
-        NewP.Table.Ranges.push_back(NewR);
-      }
+}
+NewP.Table.Ranges.push_back(NewR);
     }
     } 
 

>From a9b87c2f11858cec9ea896e2c8f1ae38243d9920 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Fri, 16 May 2025 20:52:39 +0000
Subject: [PATCH 20/29] format

---
 llvm/lib/ObjectYAML/DXContainerYAML.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index 830d5ea46459c..64c9335caa495 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -117,8 +117,8 @@ DXContainerYAML::RootSignatureYamlDesc::create(
   NewR.Val =                                                                   \
       (R.Flags & llvm::to_underlying(dxbc::DescriptorRangeFlag::Val)) > 0;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
-}
-NewP.Table.Ranges.push_back(NewR);
+        }
+        NewP.Table.Ranges.push_back(NewR);
     }
     } 
 

>From 28be2f89dfe0a10387b0f5ef6293037da866c5d6 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Tue, 20 May 2025 16:37:27 +0000
Subject: [PATCH 21/29] format

---
 .../llvm/MC/DXContainerRootSignature.h        |   6 +-
 llvm/include/llvm/Object/DXContainer.h        |  10 +-
 llvm/lib/MC/DXContainerRootSignature.cpp      |  53 ++++----
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp    |  20 +--
 llvm/lib/ObjectYAML/DXContainerYAML.cpp       |   8 +-
 llvm/unittests/Object/DXContainerTest.cpp     | 127 +++++++++---------
 6 files changed, 112 insertions(+), 112 deletions(-)

diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index 5abcf1710e8ee..cdf526d40d77d 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -28,10 +28,8 @@ struct RootParameterInfo {
       : Header(Header), Location(Location) {}
 };
 
-
 struct DescriptorTable {
   SmallVector<dxbc::RTS0::v2::DescriptorRange> Ranges;
-
   SmallVector<dxbc::RTS0::v2::DescriptorRange>::const_iterator begin() const {
     return Ranges.begin();
   }
@@ -40,8 +38,6 @@ struct DescriptorTable {
   }
 };
 
-
-
 struct RootParametersContainer {
   SmallVector<RootParameterInfo> ParametersInfo;
   SmallVector<dxbc::RootConstants> Constants;
@@ -91,7 +87,7 @@ struct RootParametersContainer {
   const dxbc::RTS0::v2::RootDescriptor &getRootDescriptor(size_t Index) const {
     return Descriptors[Index];
   }
-   const DescriptorTable &getDescriptorTable(size_t Index) const {
+  const DescriptorTable &getDescriptorTable(size_t Index) const {
     return Tables[Index];
   }
 
diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index 8908719640e63..3f15eb1a44c77 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -183,9 +183,13 @@ struct DescriptorTable {
   uint32_t RangesOffset;
   ViewArray<dxbc::RTS0::v2::DescriptorRange> Ranges;
 
-  typename ViewArray<dxbc::RTS0::v2::DescriptorRange>::iterator begin() const { return Ranges.begin(); }
+  typename ViewArray<dxbc::RTS0::v2::DescriptorRange>::iterator begin() const {
+    return Ranges.begin();
+  }
 
-  typename ViewArray<dxbc::RTS0::v2::DescriptorRange>::iterator end() const { return Ranges.end(); }
+  typename ViewArray<dxbc::RTS0::v2::DescriptorRange>::iterator end() const {
+    return Ranges.end();
+  }
 };
 
 struct DescriptorTableView : RootParameterView {
@@ -208,7 +212,7 @@ struct DescriptorTableView : RootParameterView {
     Current += sizeof(uint32_t);
 
     size_t RangeSize = sizeof(dxbc::RTS0::v1::DescriptorRange);
-    if(Version > 1)
+    if (Version > 1)
       RangeSize = sizeof(dxbc::RTS0::v2::DescriptorRange);
 
     Table.Ranges.Stride = RangeSize;
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 116ada468582c..dde7ecfb7e928 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -48,15 +48,16 @@ size_t RootSignatureDesc::getSize() const {
         Size += sizeof(dxbc::RTS0::v2::RootDescriptor);
 
       break;
-    case llvm::to_underlying(dxbc::RootParameterType::DescriptorTable): 
-    const DescriptorTable &Table = ParametersContainer.getDescriptorTable(I.Location);
-    if (Version == 1)
-      Size +=
-          sizeof(dxbc::RTS0::v1::DescriptorRange) * Table.Ranges.size() + 8;
-    else
-      Size +=
-          sizeof(dxbc::RTS0::v2::DescriptorRange) * Table.Ranges.size() + 8;
-    break;
+    case llvm::to_underlying(dxbc::RootParameterType::DescriptorTable):
+      const DescriptorTable &Table =
+          ParametersContainer.getDescriptorTable(I.Location);
+      if (Version == 1)
+        Size +=
+            sizeof(dxbc::RTS0::v1::DescriptorRange) * Table.Ranges.size() + 8;
+      else
+        Size +=
+            sizeof(dxbc::RTS0::v2::DescriptorRange) * Table.Ranges.size() + 8;
+      break;
     }
   }
   return Size;
@@ -100,8 +101,7 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       support::endian::write(BOS, Constants.Num32BitValues,
                              llvm::endianness::little);
-                            }
-                            break;
+    } break;
     case llvm::to_underlying(dxbc::RootParameterType::CBV):
     case llvm::to_underlying(dxbc::RootParameterType::SRV):
     case llvm::to_underlying(dxbc::RootParameterType::UAV): {
@@ -114,29 +114,26 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       if (Version > 1)
         support::endian::write(BOS, Descriptor.Flags, llvm::endianness::little);
-    }
-    break;
-    case llvm::to_underlying(dxbc::RootParameterType::DescriptorTable):{
+    } break;
+    case llvm::to_underlying(dxbc::RootParameterType::DescriptorTable): {
       const DescriptorTable &Table =
           ParametersContainer.getDescriptorTable(Loc);
       support::endian::write(BOS, (uint32_t)Table.Ranges.size(),
                              llvm::endianness::little);
       rewriteOffsetToCurrentByte(BOS, writePlaceholder(BOS));
       for (const auto &Range : Table) {
-          support::endian::write(BOS, Range.RangeType,
-                                 llvm::endianness::little);
-          support::endian::write(BOS, Range.NumDescriptors,
-                                 llvm::endianness::little);
-          support::endian::write(BOS, Range.BaseShaderRegister,
-                                 llvm::endianness::little);
-          support::endian::write(BOS, Range.RegisterSpace,
-                                 llvm::endianness::little);
-          support::endian::write(BOS, Range.OffsetInDescriptorsFromTableStart,
-                                 llvm::endianness::little);
-          if(Version > 1)
-            support::endian::write(BOS, Range.Flags,
-                                  llvm::endianness::little);
-          }
+        support::endian::write(BOS, Range.RangeType, llvm::endianness::little);
+        support::endian::write(BOS, Range.NumDescriptors,
+                               llvm::endianness::little);
+        support::endian::write(BOS, Range.BaseShaderRegister,
+                               llvm::endianness::little);
+        support::endian::write(BOS, Range.RegisterSpace,
+                               llvm::endianness::little);
+        support::endian::write(BOS, Range.OffsetInDescriptorsFromTableStart,
+                               llvm::endianness::little);
+        if (Version > 1)
+          support::endian::write(BOS, Range.Flags, llvm::endianness::little);
+      }
     } break;
     }
   }
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index 13ee8758e363d..8b1b61b880f1d 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -300,16 +300,16 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
           mcdxbc::DescriptorTable Table;
           for (const auto &R : Param.Table.Ranges) {
 
-              dxbc::RTS0::v2::DescriptorRange Range;
-              Range.RangeType = R.RangeType;
-              Range.NumDescriptors = R.NumDescriptors;
-              Range.BaseShaderRegister = R.BaseShaderRegister;
-              Range.RegisterSpace = R.RegisterSpace;
-              Range.OffsetInDescriptorsFromTableStart =
-                  R.OffsetInDescriptorsFromTableStart;
-              if (RS.Version > 1)
-                Range.Flags = R.getEncodedFlags();
-              Table.Ranges.push_back(Range);
+            dxbc::RTS0::v2::DescriptorRange Range;
+            Range.RangeType = R.RangeType;
+            Range.NumDescriptors = R.NumDescriptors;
+            Range.BaseShaderRegister = R.BaseShaderRegister;
+            Range.RegisterSpace = R.RegisterSpace;
+            Range.OffsetInDescriptorsFromTableStart =
+                R.OffsetInDescriptorsFromTableStart;
+            if (RS.Version > 1)
+              Range.Flags = R.getEncodedFlags();
+            Table.Ranges.push_back(Range);
           }
           RS.ParametersContainer.addParameter(Header, Table);
         } break;
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index 64c9335caa495..cccd5ea49b0b1 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -95,8 +95,10 @@ DXContainerYAML::RootSignatureYamlDesc::create(
        llvm::to_underlying(dxbc::RootDescriptorFlag::Val)) > 0;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
       }
-    } else if (auto *TDV = dyn_cast<object::DirectX::DescriptorTableView>(&ParamView)) {
-      llvm::Expected<object::DirectX::DescriptorTable>TableOrErr = TDV->read(Version);
+    } else if (auto *TDV =
+                   dyn_cast<object::DirectX::DescriptorTableView>(&ParamView)) {
+      llvm::Expected<object::DirectX::DescriptorTable> TableOrErr =
+          TDV->read(Version);
       if (Error E = TableOrErr.takeError())
         return std::move(E);
       auto Table = *TableOrErr;
@@ -119,8 +121,8 @@ DXContainerYAML::RootSignatureYamlDesc::create(
 #include "llvm/BinaryFormat/DXContainerConstants.def"
         }
         NewP.Table.Ranges.push_back(NewR);
+      }
     }
-    } 
 
     RootSigDesc.Parameters.push_back(NewP);
   }
diff --git a/llvm/unittests/Object/DXContainerTest.cpp b/llvm/unittests/Object/DXContainerTest.cpp
index d33a4264e1b14..0c25a8982af5b 100644
--- a/llvm/unittests/Object/DXContainerTest.cpp
+++ b/llvm/unittests/Object/DXContainerTest.cpp
@@ -248,49 +248,49 @@ generateDXContainer(StringRef Yaml, SmallVectorImpl<char> &BinaryData) {
 
 TEST(DXCFile, PSVResourceIterators) {
   const char *Yaml = R"(
---- !dxcontainer
-Header:
-  Hash:            [ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
-                     0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ]
-  Version:
-    Major:           1
-    Minor:           0
-  PartCount:       2
-Parts:
-  - Name:            PSV0
-    Size:            144
-    PSVInfo:
-      Version:         0
-      ShaderStage:     14
-      PayloadSizeInBytes: 4092
-      MinimumWaveLaneCount: 0
-      MaximumWaveLaneCount: 4294967295
-      ResourceStride:  16
-      Resources:
-        - Type:            Sampler
-          Space:           1
-          LowerBound:      1
-          UpperBound:      1
-        - Type:            CBV
-          Space:           2
-          LowerBound:      2
-          UpperBound:      2
-        - Type:            SRVTyped
-          Space:           3
-          LowerBound:      3
-          UpperBound:      3
-  - Name:            DXIL
-    Size:            24
-    Program:
-      MajorVersion:    6
-      MinorVersion:    0
-      ShaderKind:      14
-      Size:            6
-      DXILMajorVersion: 1
-      DXILMinorVersion: 0
-      DXILSize:        0
-...
-)";
+        --- !dxcontainer
+        Header:
+          Hash:            [ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
+                            0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ]
+          Version:
+            Major:           1
+            Minor:           0
+          PartCount:       2
+        Parts:
+          - Name:            PSV0
+            Size:            144
+            PSVInfo:
+              Version:         0
+              ShaderStage:     14
+              PayloadSizeInBytes: 4092
+              MinimumWaveLaneCount: 0
+              MaximumWaveLaneCount: 4294967295
+              ResourceStride:  16
+              Resources:
+                - Type:            Sampler
+                  Space:           1
+                  LowerBound:      1
+                  UpperBound:      1
+                - Type:            CBV
+                  Space:           2
+                  LowerBound:      2
+                  UpperBound:      2
+                - Type:            SRVTyped
+                  Space:           3
+                  LowerBound:      3
+                  UpperBound:      3
+          - Name:            DXIL
+            Size:            24
+            Program:
+              MajorVersion:    6
+              MinorVersion:    0
+              ShaderKind:      14
+              Size:            6
+              DXILMajorVersion: 1
+              DXILMinorVersion: 0
+              DXILSize:        0
+        ...
+        )";
 
   SmallVector<char, 256> BinaryData;
   auto C = generateDXContainer(Yaml, BinaryData);
@@ -560,20 +560,23 @@ TEST(DXCFile, MaliciousFiles) {
 // ...
 TEST(DXCFile, PSVResourceIteratorsStride) {
   uint8_t Buffer[] = {
-        0x44, 0x58, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0xB0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 
-        0x28, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C, 0x18, 0x00, 0x00, 0x00,
-        0x60, 0x00, 0x0E, 0x00, 0x06, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C, 0x00, 0x01, 0x00, 0x00,
-        0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x50, 0x53, 0x56, 0x30, 0x64, 0x00, 0x00, 0x00,
-        0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
-        0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00,
-        0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00,
-        0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00,
-    }; 
-    DXContainer C =
+      0x44, 0x58, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+      0xB0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00,
+      0x48, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C, 0x18, 0x00, 0x00, 0x00,
+      0x60, 0x00, 0x0E, 0x00, 0x06, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C,
+      0x00, 0x01, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+      0x50, 0x53, 0x56, 0x30, 0x64, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
+      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+      0x02, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+      0x02, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
+      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+      0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00,
+      0x07, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  };
+  DXContainer C =
       llvm::cantFail(DXContainer::create(getMemoryBuffer<180>(Buffer)));
 
   const auto &PSVInfo = C.getPSVInfo();
@@ -625,8 +628,8 @@ TEST(DXCFile, PSVResourceIteratorsStride) {
   EXPECT_EQ(Binding.Type, dxbc::PSV::ResourceType::SRVStructured);
   EXPECT_EQ(Binding.Space, 6u);
   EXPECT_EQ(Binding.LowerBound, 7u);
-  EXPECT_EQ(Binding.UpperBound, 8u);;
-
+  EXPECT_EQ(Binding.UpperBound, 8u);
+  ;
 
   EXPECT_FALSE(It == PSVInfo->getResources().end());
 
@@ -1086,8 +1089,7 @@ TEST(RootSignature, ParseDescriptorTable) {
     ASSERT_THAT_ERROR(ParamView.takeError(), Succeeded());
 
     auto *DescriptorTableView =
-        dyn_cast<DirectX::DescriptorTableView>(
-            &*ParamView);
+        dyn_cast<DirectX::DescriptorTableView>(&*ParamView);
     ASSERT_TRUE(DescriptorTableView != nullptr);
     auto Table = DescriptorTableView->read(2);
 
@@ -1139,8 +1141,7 @@ TEST(RootSignature, ParseDescriptorTable) {
     ASSERT_THAT_ERROR(ParamView.takeError(), Succeeded());
 
     auto *DescriptorTableView =
-        dyn_cast<DirectX::DescriptorTableView>(
-            &*ParamView);
+        dyn_cast<DirectX::DescriptorTableView>(&*ParamView);
     ASSERT_TRUE(DescriptorTableView != nullptr);
     auto Table = DescriptorTableView->read(1);
 

>From 76a2b07dd4c6e8507f23df76ce7f530375ce8812 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 21 May 2025 17:11:41 +0000
Subject: [PATCH 22/29] clean up

---
 .../llvm/MC/DXContainerRootSignature.h        |   3 +-
 llvm/include/llvm/Object/DXContainer.h        |  14 ++-
 .../include/llvm/ObjectYAML/DXContainerYAML.h |   2 -
 llvm/lib/MC/DXContainerRootSignature.cpp      |  22 ++--
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp    |   1 -
 llvm/lib/ObjectYAML/DXContainerYAML.cpp       |   1 -
 llvm/unittests/Object/DXContainerTest.cpp     | 118 +++++++++---------
 7 files changed, 81 insertions(+), 80 deletions(-)

diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index cdf526d40d77d..7b47c697fcfa6 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -6,12 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/BinaryFormat/DXContainer.h"
 #include <cstdint>
 #include <limits>
-#include <variant>
 
 namespace llvm {
 
@@ -87,6 +85,7 @@ struct RootParametersContainer {
   const dxbc::RTS0::v2::RootDescriptor &getRootDescriptor(size_t Index) const {
     return Descriptors[Index];
   }
+
   const DescriptorTable &getDescriptorTable(size_t Index) const {
     return Tables[Index];
   }
diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index 3f15eb1a44c77..12fdcb38f1e42 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -20,11 +20,12 @@
 #include "llvm/ADT/Twine.h"
 #include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/Object/Error.h"
-#include "llvm/Support/Casting.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/MemoryBufferRef.h"
 #include "llvm/TargetParser/Triple.h"
+#include <array>
+#include <cstddef>
 #include <cstdint>
 #include <variant>
 
@@ -41,7 +42,6 @@ template <typename T>
 std::enable_if_t<std::is_class<T>::value, void> swapBytes(T &value) {
   value.swapBytes();
 }
-
 } // namespace detail
 
 // This class provides a view into the underlying resource array. The Resource
@@ -278,11 +278,13 @@ class RootSignature {
           support::endian::read<uint32_t, llvm::endianness::little>(
               PartData.begin() + Header.ParameterOffset);
       if (Version == 1)
-        DataSize = sizeof(dxbc::RTS0::v1::DescriptorRange) * NumRanges +
-                   2 * sizeof(uint32_t);
+        DataSize = sizeof(dxbc::RTS0::v1::DescriptorRange) * NumRanges;
       else
-        DataSize = sizeof(dxbc::RTS0::v2::DescriptorRange) * NumRanges +
-                   2 * sizeof(uint32_t);
+        DataSize = sizeof(dxbc::RTS0::v2::DescriptorRange) * NumRanges;
+
+      // 4 bits for the number of ranges in table and
+      // 4 bits for the ranges offset
+      DataSize += 2 * sizeof(uint32_t);
       break;
     }
     size_t EndOfSectionByte = getNumStaticSamplers() == 0
diff --git a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
index ced8c9583d6ad..80177c0b087fd 100644
--- a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
+++ b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
@@ -15,8 +15,6 @@
 #ifndef LLVM_OBJECTYAML_DXCONTAINERYAML_H
 #define LLVM_OBJECTYAML_DXCONTAINERYAML_H
 
-#include "llvm/ADT/STLForwardCompat.h"
-#include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/Object/DXContainer.h"
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index dde7ecfb7e928..74463e374270e 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -7,10 +7,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/MC/DXContainerRootSignature.h"
-#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/ADT/SmallString.h"
-#include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/Support/EndianStream.h"
+#include <cstdint>
 
 using namespace llvm;
 using namespace llvm::mcdxbc;
@@ -51,12 +50,14 @@ size_t RootSignatureDesc::getSize() const {
     case llvm::to_underlying(dxbc::RootParameterType::DescriptorTable):
       const DescriptorTable &Table =
           ParametersContainer.getDescriptorTable(I.Location);
+
+      // 4 bits for the number of ranges in table and
+      // 4 bits for the ranges offset
+      Size += 2 * sizeof(uint32_t);
       if (Version == 1)
-        Size +=
-            sizeof(dxbc::RTS0::v1::DescriptorRange) * Table.Ranges.size() + 8;
+        Size += sizeof(dxbc::RTS0::v1::DescriptorRange) * Table.Ranges.size();
       else
-        Size +=
-            sizeof(dxbc::RTS0::v2::DescriptorRange) * Table.Ranges.size() + 8;
+        Size += sizeof(dxbc::RTS0::v2::DescriptorRange) * Table.Ranges.size();
       break;
     }
   }
@@ -101,7 +102,8 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       support::endian::write(BOS, Constants.Num32BitValues,
                              llvm::endianness::little);
-    } break;
+      break;
+    }
     case llvm::to_underlying(dxbc::RootParameterType::CBV):
     case llvm::to_underlying(dxbc::RootParameterType::SRV):
     case llvm::to_underlying(dxbc::RootParameterType::UAV): {
@@ -114,7 +116,8 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
                              llvm::endianness::little);
       if (Version > 1)
         support::endian::write(BOS, Descriptor.Flags, llvm::endianness::little);
-    } break;
+      break;
+    }
     case llvm::to_underlying(dxbc::RootParameterType::DescriptorTable): {
       const DescriptorTable &Table =
           ParametersContainer.getDescriptorTable(Loc);
@@ -134,7 +137,8 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
         if (Version > 1)
           support::endian::write(BOS, Range.Flags, llvm::endianness::little);
       }
-    } break;
+      break;
+    }
     }
   }
   assert(Storage.size() == getSize());
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index 8b1b61b880f1d..7494273beb57a 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -11,7 +11,6 @@
 ///
 //===----------------------------------------------------------------------===//
 
-#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/MC/DXContainerPSVInfo.h"
 #include "llvm/MC/DXContainerRootSignature.h"
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index cccd5ea49b0b1..5f6305921c21f 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -382,7 +382,6 @@ void MappingTraits<llvm::DXContainerYAML::RootParameterYamlDesc>::mapping(
   case llvm::to_underlying(dxbc::RootParameterType::DescriptorTable):
     IO.mapRequired("Table", P.Table);
     break;
-    break;
   }
 }
 
diff --git a/llvm/unittests/Object/DXContainerTest.cpp b/llvm/unittests/Object/DXContainerTest.cpp
index 0c25a8982af5b..2505c9e728201 100644
--- a/llvm/unittests/Object/DXContainerTest.cpp
+++ b/llvm/unittests/Object/DXContainerTest.cpp
@@ -248,49 +248,49 @@ generateDXContainer(StringRef Yaml, SmallVectorImpl<char> &BinaryData) {
 
 TEST(DXCFile, PSVResourceIterators) {
   const char *Yaml = R"(
-        --- !dxcontainer
-        Header:
-          Hash:            [ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
-                            0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ]
-          Version:
-            Major:           1
-            Minor:           0
-          PartCount:       2
-        Parts:
-          - Name:            PSV0
-            Size:            144
-            PSVInfo:
-              Version:         0
-              ShaderStage:     14
-              PayloadSizeInBytes: 4092
-              MinimumWaveLaneCount: 0
-              MaximumWaveLaneCount: 4294967295
-              ResourceStride:  16
-              Resources:
-                - Type:            Sampler
-                  Space:           1
-                  LowerBound:      1
-                  UpperBound:      1
-                - Type:            CBV
-                  Space:           2
-                  LowerBound:      2
-                  UpperBound:      2
-                - Type:            SRVTyped
-                  Space:           3
-                  LowerBound:      3
-                  UpperBound:      3
-          - Name:            DXIL
-            Size:            24
-            Program:
-              MajorVersion:    6
-              MinorVersion:    0
-              ShaderKind:      14
-              Size:            6
-              DXILMajorVersion: 1
-              DXILMinorVersion: 0
-              DXILSize:        0
-        ...
-        )";
+--- !dxcontainer
+Header:
+  Hash:            [ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
+                    0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ]
+  Version:
+    Major:           1
+    Minor:           0
+  PartCount:       2
+Parts:
+  - Name:            PSV0
+    Size:            144
+    PSVInfo:
+      Version:         0
+      ShaderStage:     14
+      PayloadSizeInBytes: 4092
+      MinimumWaveLaneCount: 0
+      MaximumWaveLaneCount: 4294967295
+      ResourceStride:  16
+      Resources:
+        - Type:            Sampler
+          Space:           1
+          LowerBound:      1
+          UpperBound:      1
+        - Type:            CBV
+          Space:           2
+          LowerBound:      2
+          UpperBound:      2
+        - Type:            SRVTyped
+          Space:           3
+          LowerBound:      3
+          UpperBound:      3
+  - Name:            DXIL
+    Size:            24
+    Program:
+      MajorVersion:    6
+      MinorVersion:    0
+      ShaderKind:      14
+      Size:            6
+      DXILMajorVersion: 1
+      DXILMinorVersion: 0
+      DXILSize:        0
+...
+)";
 
   SmallVector<char, 256> BinaryData;
   auto C = generateDXContainer(Yaml, BinaryData);
@@ -560,21 +560,21 @@ TEST(DXCFile, MaliciousFiles) {
 // ...
 TEST(DXCFile, PSVResourceIteratorsStride) {
   uint8_t Buffer[] = {
-      0x44, 0x58, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-      0xB0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00,
-      0x48, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C, 0x18, 0x00, 0x00, 0x00,
-      0x60, 0x00, 0x0E, 0x00, 0x06, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C,
-      0x00, 0x01, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x50, 0x53, 0x56, 0x30, 0x64, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x02, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-      0x02, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00,
-      0x07, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x44, 0x58, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+        0xB0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00,
+        0x48, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C, 0x18, 0x00, 0x00, 0x00,
+        0x60, 0x00, 0x0E, 0x00, 0x06, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C,
+        0x00, 0x01, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x50, 0x53, 0x56, 0x30, 0x64, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x02, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+        0x02, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00,
+        0x07, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   };
   DXContainer C =
       llvm::cantFail(DXContainer::create(getMemoryBuffer<180>(Buffer)));
@@ -602,7 +602,7 @@ TEST(DXCFile, PSVResourceIteratorsStride) {
   EXPECT_EQ(Binding.Type, dxbc::PSV::ResourceType::SRVStructured);
   EXPECT_EQ(Binding.Space, 6u);
   EXPECT_EQ(Binding.LowerBound, 7u);
-  EXPECT_EQ(Binding.UpperBound, 8u);
+  EXPECT_EQ(Binding.UpperBound, 8u);;
 
   --It;
   Binding = *It;

>From b8911261de5bbda37ce1be0385f8aab69d996ccc Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 21 May 2025 17:30:24 +0000
Subject: [PATCH 23/29] clean up

---
 llvm/lib/MC/DXContainerRootSignature.cpp   | 1 -
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp | 1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 74463e374270e..3f3e86ae1e1a6 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -9,7 +9,6 @@
 #include "llvm/MC/DXContainerRootSignature.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/Support/EndianStream.h"
-#include <cstdint>
 
 using namespace llvm;
 using namespace llvm::mcdxbc;
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index 7494273beb57a..0ae8f4e5610dd 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -317,6 +317,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
           // obj2yaml/yaml2obj parse and emit invalid dxcontainer data, in order
           // for that to be used as a testing tool more effectively.
           RS.ParametersContainer.addInvalidParameter(Header);
+          break;
         }
       }
 

>From 2a9325250e09daacf68b8764bc1f005fde7accf6 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 21 May 2025 22:11:52 +0000
Subject: [PATCH 24/29] fix formating issue

---
 llvm/unittests/Object/DXContainerTest.cpp | 37 +++++++++++------------
 1 file changed, 17 insertions(+), 20 deletions(-)

diff --git a/llvm/unittests/Object/DXContainerTest.cpp b/llvm/unittests/Object/DXContainerTest.cpp
index 2505c9e728201..5415d28779801 100644
--- a/llvm/unittests/Object/DXContainerTest.cpp
+++ b/llvm/unittests/Object/DXContainerTest.cpp
@@ -560,23 +560,20 @@ TEST(DXCFile, MaliciousFiles) {
 // ...
 TEST(DXCFile, PSVResourceIteratorsStride) {
   uint8_t Buffer[] = {
-        0x44, 0x58, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-        0xB0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00,
-        0x48, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C, 0x18, 0x00, 0x00, 0x00,
-        0x60, 0x00, 0x0E, 0x00, 0x06, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C,
-        0x00, 0x01, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x50, 0x53, 0x56, 0x30, 0x64, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x02, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-        0x02, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00,
-        0x07, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  };
-  DXContainer C =
+        0x44, 0x58, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0xB0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 
+        0x28, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C, 0x18, 0x00, 0x00, 0x00,
+        0x60, 0x00, 0x0E, 0x00, 0x06, 0x00, 0x00, 0x00, 0x44, 0x58, 0x49, 0x4C, 0x00, 0x01, 0x00, 0x00,
+        0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x50, 0x53, 0x56, 0x30, 0x64, 0x00, 0x00, 0x00,
+        0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
+        0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00,
+        0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00,
+        0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+    }; 
+    DXContainer C =
       llvm::cantFail(DXContainer::create(getMemoryBuffer<180>(Buffer)));
 
   const auto &PSVInfo = C.getPSVInfo();
@@ -602,7 +599,7 @@ TEST(DXCFile, PSVResourceIteratorsStride) {
   EXPECT_EQ(Binding.Type, dxbc::PSV::ResourceType::SRVStructured);
   EXPECT_EQ(Binding.Space, 6u);
   EXPECT_EQ(Binding.LowerBound, 7u);
-  EXPECT_EQ(Binding.UpperBound, 8u);;
+  EXPECT_EQ(Binding.UpperBound, 8u);
 
   --It;
   Binding = *It;
@@ -628,8 +625,8 @@ TEST(DXCFile, PSVResourceIteratorsStride) {
   EXPECT_EQ(Binding.Type, dxbc::PSV::ResourceType::SRVStructured);
   EXPECT_EQ(Binding.Space, 6u);
   EXPECT_EQ(Binding.LowerBound, 7u);
-  EXPECT_EQ(Binding.UpperBound, 8u);
-  ;
+  EXPECT_EQ(Binding.UpperBound, 8u);;
+
 
   EXPECT_FALSE(It == PSVInfo->getResources().end());
 

>From d616b659a7d56fcf2774a7e6d6961026021dc530 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Wed, 21 May 2025 22:13:45 +0000
Subject: [PATCH 25/29] fix formating issue

---
 llvm/unittests/Object/DXContainerTest.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/unittests/Object/DXContainerTest.cpp b/llvm/unittests/Object/DXContainerTest.cpp
index 5415d28779801..b52e96e9aefc9 100644
--- a/llvm/unittests/Object/DXContainerTest.cpp
+++ b/llvm/unittests/Object/DXContainerTest.cpp
@@ -251,7 +251,7 @@ TEST(DXCFile, PSVResourceIterators) {
 --- !dxcontainer
 Header:
   Hash:            [ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
-                    0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ]
+                     0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ]
   Version:
     Major:           1
     Minor:           0

>From 6eac7c4494e73e195c08d40915aa01aa15d69dad Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Thu, 22 May 2025 18:19:42 +0000
Subject: [PATCH 26/29] making NumDescriptors uint32_t

---
 llvm/include/llvm/BinaryFormat/DXContainer.h  |  2 +-
 .../llvm/MC/DXContainerRootSignature.h        |  6 +-
 llvm/include/llvm/Object/DXContainer.h        |  4 +-
 .../include/llvm/ObjectYAML/DXContainerYAML.h |  3 +-
 llvm/lib/MC/DXContainerRootSignature.cpp      |  4 +-
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp    |  1 +
 llvm/lib/ObjectYAML/DXContainerYAML.cpp       | 19 +++-
 .../RootSignature-DescriptorTable1.0.yaml     |  8 +-
 .../RootSignature-DescriptorTable1.1.yaml     |  8 +-
 .../RootSignature-MultipleParameters.yaml     | 86 +++++++++----------
 llvm/unittests/Object/DXContainerTest.cpp     | 16 ++--
 .../ObjectYAML/DXContainerYAMLTest.cpp        | 12 +--
 12 files changed, 91 insertions(+), 78 deletions(-)

diff --git a/llvm/include/llvm/BinaryFormat/DXContainer.h b/llvm/include/llvm/BinaryFormat/DXContainer.h
index 2f1a9fe2e8f93..677583ffee22d 100644
--- a/llvm/include/llvm/BinaryFormat/DXContainer.h
+++ b/llvm/include/llvm/BinaryFormat/DXContainer.h
@@ -613,7 +613,7 @@ struct DescriptorRange {
   uint32_t NumDescriptors;
   uint32_t BaseShaderRegister;
   uint32_t RegisterSpace;
-  int32_t OffsetInDescriptorsFromTableStart;
+  uint32_t OffsetInDescriptorsFromTableStart;
   void swapBytes() {
     sys::swapByteOrder(RangeType);
     sys::swapByteOrder(NumDescriptors);
diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index 7b47c697fcfa6..c9dc382c3c1c0 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -62,9 +62,9 @@ struct RootParametersContainer {
     Descriptors.push_back(Descriptor);
   }
 
-  void addParameter(dxbc::RootParameterHeader H, DescriptorTable D) {
-    addInfo(H, Tables.size());
-    Tables.push_back(D);
+  void addParameter(dxbc::RootParameterHeader Header, DescriptorTable Table) {
+    addInfo(Header, Tables.size());
+    Tables.push_back(Table);
   }
 
   const std::pair<uint32_t, uint32_t>
diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index 12fdcb38f1e42..0b8d71f686fd6 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -282,8 +282,8 @@ class RootSignature {
       else
         DataSize = sizeof(dxbc::RTS0::v2::DescriptorRange) * NumRanges;
 
-      // 4 bits for the number of ranges in table and
-      // 4 bits for the ranges offset
+      // 4 bytes for the number of ranges in table and
+      // 4 bytes for the ranges offset
       DataSize += 2 * sizeof(uint32_t);
       break;
     }
diff --git a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
index 80177c0b087fd..730a4cd11f37f 100644
--- a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
+++ b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
@@ -95,7 +95,7 @@ struct DescriptorRangeYaml {
   uint32_t NumDescriptors;
   uint32_t BaseShaderRegister;
   uint32_t RegisterSpace;
-  int32_t OffsetInDescriptorsFromTableStart;
+  uint32_t OffsetInDescriptorsFromTableStart;
 
   uint32_t getEncodedFlags() const;
 
@@ -195,7 +195,6 @@ struct RootParameterYamlDesc {
     return *this;
   }
 
-  // ToDo: Fix this (Already have a follow up PR with it)
   union {
     RootConstantsYaml Constants;
     RootDescriptorYaml Descriptor;
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index 3f3e86ae1e1a6..bb6c14804e2cb 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -50,8 +50,8 @@ size_t RootSignatureDesc::getSize() const {
       const DescriptorTable &Table =
           ParametersContainer.getDescriptorTable(I.Location);
 
-      // 4 bits for the number of ranges in table and
-      // 4 bits for the ranges offset
+      // 4 bytes for the number of ranges in table and
+      // 4 bytes for the ranges offset
       Size += 2 * sizeof(uint32_t);
       if (Version == 1)
         Size += sizeof(dxbc::RTS0::v1::DescriptorRange) * Table.Ranges.size();
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index 0ae8f4e5610dd..27e05d7577eba 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -322,6 +322,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
       }
 
       RS.write(OS);
+      break;
     }
     uint64_t BytesWritten = OS.tell() - DataStart;
     RollingOffset += BytesWritten;
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index 5f6305921c21f..d25e908a9af26 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -17,6 +17,7 @@
 #include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/ScopedPrinter.h"
+#include <climits>
 #include <cstdint>
 #include <system_error>
 
@@ -95,10 +96,10 @@ DXContainerYAML::RootSignatureYamlDesc::create(
        llvm::to_underlying(dxbc::RootDescriptorFlag::Val)) > 0;
 #include "llvm/BinaryFormat/DXContainerConstants.def"
       }
-    } else if (auto *TDV =
+    } else if (auto *DTV =
                    dyn_cast<object::DirectX::DescriptorTableView>(&ParamView)) {
       llvm::Expected<object::DirectX::DescriptorTable> TableOrErr =
-          TDV->read(Version);
+          DTV->read(Version);
       if (Error E = TableOrErr.takeError())
         return std::move(E);
       auto Table = *TableOrErr;
@@ -349,7 +350,19 @@ void MappingTraits<llvm::DXContainerYAML::RootDescriptorYaml>::mapping(
 void MappingTraits<llvm::DXContainerYAML::DescriptorRangeYaml>::mapping(
     IO &IO, llvm::DXContainerYAML::DescriptorRangeYaml &R) {
   IO.mapRequired("RangeType", R.RangeType);
-  IO.mapRequired("NumDescriptors", R.NumDescriptors);
+  // handling the edge case where NumDescriptors might be -1
+  if (IO.outputting()) {
+    if (R.NumDescriptors == UINT_MAX) {
+      int32_t NegOne = -1;
+      IO.mapRequired("NumDescriptors", NegOne);
+    } else
+      IO.mapRequired("NumDescriptors", R.NumDescriptors);
+  } else {
+    int32_t TmpNumDesc = 0;
+    IO.mapRequired("NumDescriptors", TmpNumDesc);
+    R.NumDescriptors = static_cast<uint32_t>(TmpNumDesc);
+  }
+
   IO.mapRequired("BaseShaderRegister", R.BaseShaderRegister);
   IO.mapRequired("RegisterSpace", R.RegisterSpace);
   IO.mapRequired("OffsetInDescriptorsFromTableStart",
diff --git a/llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.0.yaml b/llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.0.yaml
index f431afa3cd3d3..0441bb7a256b1 100644
--- a/llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.0.yaml
+++ b/llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.0.yaml
@@ -26,10 +26,10 @@ Parts:
         NumRanges: 1
         Ranges:
           - RangeType: 0
-            NumDescriptors: 41
+            NumDescriptors: -1
             BaseShaderRegister: 42
             RegisterSpace: 43
-            OffsetInDescriptorsFromTableStart: -1
+            OffsetInDescriptorsFromTableStart: 41
     AllowInputAssemblerInputLayout: true
     DenyGeometryShaderRootAccess: true
 
@@ -49,9 +49,9 @@ Parts:
 # CHECK-NEXT:         RangesOffset: 44
 # CHECK-NEXT:         Ranges:
 # CHECK-NEXT:           - RangeType: 0
-# CHECK-NEXT:             NumDescriptors: 41
+# CHECK-NEXT:             NumDescriptors: -1
 # CHECK-NEXT:             BaseShaderRegister: 42
 # CHECK-NEXT:             RegisterSpace: 43
-# CHECK-NEXT:             OffsetInDescriptorsFromTableStart: -1
+# CHECK-NEXT:             OffsetInDescriptorsFromTableStart: 41
 # CHECK-NEXT:     AllowInputAssemblerInputLayout: true
 # CHECK-NEXT:     DenyGeometryShaderRootAccess: true
diff --git a/llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.1.yaml b/llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.1.yaml
index 54899cae57bf9..d06be5e181418 100644
--- a/llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.1.yaml
+++ b/llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.1.yaml
@@ -26,10 +26,10 @@ Parts:
         NumRanges: 1
         Ranges:
           - RangeType: 0
-            NumDescriptors: 41
+            NumDescriptors: -1
             BaseShaderRegister: 42
             RegisterSpace: 43
-            OffsetInDescriptorsFromTableStart: -1
+            OffsetInDescriptorsFromTableStart: 41
             DATA_STATIC_WHILE_SET_AT_EXECUTE: true
     AllowInputAssemblerInputLayout: true
     DenyGeometryShaderRootAccess: true
@@ -50,10 +50,10 @@ Parts:
 # CHECK-NEXT:             RangesOffset:    44
 # CHECK-NEXT:             Ranges:
 # CHECK-NEXT:               - RangeType:       0
-# CHECK-NEXT:                 NumDescriptors:  41
+# CHECK-NEXT:                 NumDescriptors:  -1
 # CHECK-NEXT:                 BaseShaderRegister: 42
 # CHECK-NEXT:                 RegisterSpace:   43
-# CHECK-NEXT:                 OffsetInDescriptorsFromTableStart: -1
+# CHECK-NEXT:                 OffsetInDescriptorsFromTableStart: 41
 # CHECK-NEXT:                 DATA_STATIC_WHILE_SET_AT_EXECUTE: true
 # CHECK-NEXT:       AllowInputAssemblerInputLayout: true
 # CHECK-NEXT:       DenyGeometryShaderRootAccess: true
diff --git a/llvm/test/ObjectYAML/DXContainer/RootSignature-MultipleParameters.yaml b/llvm/test/ObjectYAML/DXContainer/RootSignature-MultipleParameters.yaml
index 50cf7950be8aa..947fc096a9207 100644
--- a/llvm/test/ObjectYAML/DXContainer/RootSignature-MultipleParameters.yaml
+++ b/llvm/test/ObjectYAML/DXContainer/RootSignature-MultipleParameters.yaml
@@ -43,52 +43,52 @@ Parts:
           NumRanges: 1
           Ranges:
             - RangeType: 0
-              NumDescriptors: 41
+              NumDescriptors: -1
               BaseShaderRegister: 42
               RegisterSpace: 43
-              OffsetInDescriptorsFromTableStart: -1
+              OffsetInDescriptorsFromTableStart: 41
               DESCRIPTORS_STATIC_KEEPING_BUFFER_BOUNDS_CHECKS: true
       AllowInputAssemblerInputLayout: true
       DenyGeometryShaderRootAccess: true
 
-#CHECK:  - Name:            RTS0
-#CHECK-NEXT:    Size:            200
-#CHECK-NEXT:    RootSignature:
-#CHECK-NEXT:      Version:         2
-#CHECK-NEXT:      NumRootParameters: 4
-#CHECK-NEXT:      RootParametersOffset: 24
-#CHECK-NEXT:      NumStaticSamplers: 0
-#CHECK-NEXT:      StaticSamplersOffset: 60
-#CHECK-NEXT:      Parameters:
-#CHECK-NEXT:        - ParameterType:   1
-#CHECK-NEXT:          ShaderVisibility: 2
-#CHECK-NEXT:          Constants:
-#CHECK-NEXT:            Num32BitValues:  16
-#CHECK-NEXT:            RegisterSpace:   14
-#CHECK-NEXT:            ShaderRegister:  15
-#CHECK-NEXT:        - ParameterType:   1
-#CHECK-NEXT:          ShaderVisibility: 4
-#CHECK-NEXT:          Constants:
-#CHECK-NEXT:            Num32BitValues:  21
-#CHECK-NEXT:            RegisterSpace:   23
-#CHECK-NEXT:            ShaderRegister:  22
-#CHECK-NEXT:        - ParameterType:   2
-#CHECK-NEXT:          ShaderVisibility: 3
-#CHECK-NEXT:          Descriptor:
-#CHECK-NEXT:            RegisterSpace:   32
-#CHECK-NEXT:            ShaderRegister:  31
-#CHECK-NEXT:            DATA_STATIC_WHILE_SET_AT_EXECUTE: true
-#CHECK-NEXT:        - ParameterType:   0
-#CHECK-NEXT:          ShaderVisibility: 3
-#CHECK-NEXT:          Table:
-#CHECK-NEXT:            NumRanges:       1
-#CHECK-NEXT:            RangesOffset:    116
-#CHECK-NEXT:            Ranges:
-#CHECK-NEXT:              - RangeType:       0
-#CHECK-NEXT:                NumDescriptors:  41
-#CHECK-NEXT:                BaseShaderRegister: 42
-#CHECK-NEXT:                RegisterSpace:   43
-#CHECK-NEXT:                OffsetInDescriptorsFromTableStart: -1
-#CHECK-NEXT:                DESCRIPTORS_STATIC_KEEPING_BUFFER_BOUNDS_CHECKS: true
-#CHECK-NEXT:      AllowInputAssemblerInputLayout: true
-#CHECK-NEXT:      DenyGeometryShaderRootAccess: true
+# CHECK:  - Name:            RTS0
+# CHECK-NEXT:    Size:            200
+# CHECK-NEXT:    RootSignature:
+# CHECK-NEXT:      Version:         2
+# CHECK-NEXT:      NumRootParameters: 4
+# CHECK-NEXT:      RootParametersOffset: 24
+# CHECK-NEXT:      NumStaticSamplers: 0
+# CHECK-NEXT:      StaticSamplersOffset: 60
+# CHECK-NEXT:      Parameters:
+# CHECK-NEXT:        - ParameterType:   1
+# CHECK-NEXT:          ShaderVisibility: 2
+# CHECK-NEXT:          Constants:
+# CHECK-NEXT:            Num32BitValues:  16
+# CHECK-NEXT:            RegisterSpace:   14
+# CHECK-NEXT:            ShaderRegister:  15
+# CHECK-NEXT:        - ParameterType:   1
+# CHECK-NEXT:          ShaderVisibility: 4
+# CHECK-NEXT:          Constants:
+# CHECK-NEXT:            Num32BitValues:  21
+# CHECK-NEXT:            RegisterSpace:   23
+# CHECK-NEXT:            ShaderRegister:  22
+# CHECK-NEXT:        - ParameterType:   2
+# CHECK-NEXT:          ShaderVisibility: 3
+# CHECK-NEXT:          Descriptor:
+# CHECK-NEXT:            RegisterSpace:   32
+# CHECK-NEXT:            ShaderRegister:  31
+# CHECK-NEXT:            DATA_STATIC_WHILE_SET_AT_EXECUTE: true
+# CHECK-NEXT:        - ParameterType:   0
+# CHECK-NEXT:          ShaderVisibility: 3
+# CHECK-NEXT:          Table:
+# CHECK-NEXT:            NumRanges:       1
+# CHECK-NEXT:            RangesOffset:    116
+# CHECK-NEXT:            Ranges:
+# CHECK-NEXT:              - RangeType:       0
+# CHECK-NEXT:                NumDescriptors:  -1
+# CHECK-NEXT:                BaseShaderRegister: 42
+# CHECK-NEXT:                RegisterSpace:   43
+# CHECK-NEXT:                OffsetInDescriptorsFromTableStart: 41
+# CHECK-NEXT:                DESCRIPTORS_STATIC_KEEPING_BUFFER_BOUNDS_CHECKS: true
+# CHECK-NEXT:      AllowInputAssemblerInputLayout: true
+# CHECK-NEXT:      DenyGeometryShaderRootAccess: true
diff --git a/llvm/unittests/Object/DXContainerTest.cpp b/llvm/unittests/Object/DXContainerTest.cpp
index b52e96e9aefc9..71503729b5f34 100644
--- a/llvm/unittests/Object/DXContainerTest.cpp
+++ b/llvm/unittests/Object/DXContainerTest.cpp
@@ -1061,8 +1061,8 @@ TEST(RootSignature, ParseDescriptorTable) {
         0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x3c, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x03, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-        0x2c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x00, 0x00, 0x00,
-        0x2a, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+        0x2c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+        0x2a, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0x29, 0x00, 0x00, 0x00,
         0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x00};
@@ -1097,10 +1097,10 @@ TEST(RootSignature, ParseDescriptorTable) {
     auto Range = *Table->begin();
 
     ASSERT_EQ(Range.RangeType, 0u);
-    ASSERT_EQ(Range.NumDescriptors, 41u);
+    ASSERT_EQ(Range.NumDescriptors, -1u);
     ASSERT_EQ(Range.BaseShaderRegister, 42u);
     ASSERT_EQ(Range.RegisterSpace, 43u);
-    ASSERT_EQ(Range.OffsetInDescriptorsFromTableStart, -1);
+    ASSERT_EQ(Range.OffsetInDescriptorsFromTableStart, 41u);
     ASSERT_EQ(Range.Flags, 65536u);
   }
 
@@ -1113,8 +1113,8 @@ TEST(RootSignature, ParseDescriptorTable) {
         0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x3c, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x03, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-        0x2c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x00, 0x00, 0x00,
-        0x2a, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+        0x2c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+        0x2a, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0x29, 0x00, 0x00, 0x00,
         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x00};
@@ -1149,9 +1149,9 @@ TEST(RootSignature, ParseDescriptorTable) {
     auto Range = *Table->begin();
 
     ASSERT_EQ(Range.RangeType, 0u);
-    ASSERT_EQ(Range.NumDescriptors, 41u);
+    ASSERT_EQ(Range.NumDescriptors, -1u);
     ASSERT_EQ(Range.BaseShaderRegister, 42u);
     ASSERT_EQ(Range.RegisterSpace, 43u);
-    ASSERT_EQ(Range.OffsetInDescriptorsFromTableStart, -1);
+    ASSERT_EQ(Range.OffsetInDescriptorsFromTableStart, 41u);
   }
 }
diff --git a/llvm/unittests/ObjectYAML/DXContainerYAMLTest.cpp b/llvm/unittests/ObjectYAML/DXContainerYAMLTest.cpp
index fa3af7045a4fd..9215b609a485a 100644
--- a/llvm/unittests/ObjectYAML/DXContainerYAMLTest.cpp
+++ b/llvm/unittests/ObjectYAML/DXContainerYAMLTest.cpp
@@ -388,7 +388,7 @@ TEST(RootSignature, ParseDescriptorTableV10) {
               NumDescriptors: 41
               BaseShaderRegister: 42
               RegisterSpace: 43
-              OffsetInDescriptorsFromTableStart: -1
+              OffsetInDescriptorsFromTableStart: 44
       AllowInputAssemblerInputLayout: true
       DenyGeometryShaderRootAccess: true
     )"));
@@ -402,7 +402,7 @@ TEST(RootSignature, ParseDescriptorTableV10) {
       0x3c, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x03, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
       0x2c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x00, 0x00, 0x00,
-      0x2a, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+      0x2a, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0x2c, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00};
@@ -441,10 +441,10 @@ TEST(RootSignature, ParseDescriptorTableV11) {
           NumRanges: 1
           Ranges:
             - RangeType: 0
-              NumDescriptors: 41
+              NumDescriptors: -1
               BaseShaderRegister: 42
               RegisterSpace: 43
-              OffsetInDescriptorsFromTableStart: -1
+              OffsetInDescriptorsFromTableStart: 41
               DESCRIPTORS_STATIC_KEEPING_BUFFER_BOUNDS_CHECKS: true
       AllowInputAssemblerInputLayout: true
       DenyGeometryShaderRootAccess: true
@@ -458,8 +458,8 @@ TEST(RootSignature, ParseDescriptorTableV11) {
       0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x3c, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x03, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-      0x2c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x00, 0x00, 0x00,
-      0x2a, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+      0x2c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+      0x2a, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0x29, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00};

>From f8080c45e7070d0e3a8e7673b3195ab53b902041 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Thu, 22 May 2025 21:50:05 +0000
Subject: [PATCH 27/29] fix tests

---
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp | 17 +++++++++++++++++
 llvm/lib/ObjectYAML/DXContainerYAML.cpp    |  9 +++++++++
 2 files changed, 26 insertions(+)

diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index b4eed282f1c8a..5a31b1205f95e 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -14,6 +14,7 @@
 #include "llvm/BinaryFormat/DXContainer.h"
 #include "llvm/MC/DXContainerPSVInfo.h"
 #include "llvm/MC/DXContainerRootSignature.h"
+#include "llvm/ObjectYAML/DXContainerYAML.h"
 #include "llvm/ObjectYAML/ObjectYAML.h"
 #include "llvm/ObjectYAML/yaml2obj.h"
 #include "llvm/Support/Errc.h"
@@ -293,6 +294,22 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
           if (RS.Version > 1)
             Descriptor.Flags = DescriptorYaml->getEncodedFlags();
           RS.ParametersContainer.addParameter(Header, Descriptor);
+        } else if (auto *TableYaml = std::get_if<DXContainerYAML::DescriptorTableYaml>(&Param.Data)) {  
+          mcdxbc::DescriptorTable Table;
+          for (const auto &R : TableYaml->Ranges) {
+
+            dxbc::RTS0::v2::DescriptorRange Range;
+            Range.RangeType = R.RangeType;
+            Range.NumDescriptors = R.NumDescriptors;
+            Range.BaseShaderRegister = R.BaseShaderRegister;
+            Range.RegisterSpace = R.RegisterSpace;
+            Range.OffsetInDescriptorsFromTableStart =
+                R.OffsetInDescriptorsFromTableStart;
+            if (RS.Version > 1)
+              Range.Flags = R.getEncodedFlags();
+            Table.Ranges.push_back(Range);
+          }
+          RS.ParametersContainer.addParameter(Header, Table);
         } else {
           // Handling invalid parameter type edge case. We intentionally let
           // obj2yaml/yaml2obj parse and emit invalid dxcontainer data, in order
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index c5a9500b4ce5d..a7e199b47da26 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -158,6 +158,15 @@ uint32_t DXContainerYAML::RootSignatureYamlDesc::getEncodedFlags() {
   return Flag;
 }
 
+uint32_t DXContainerYAML::DescriptorRangeYaml::getEncodedFlags() const {
+  uint64_t Flag = 0;
+#define DESCRIPTOR_RANGE_FLAG(Num, Val)                                        \
+  if (Val)                                                                     \
+    Flag |= (uint32_t)dxbc::DescriptorRangeFlag::Val;
+#include "llvm/BinaryFormat/DXContainerConstants.def"
+  return Flag;
+}
+
 uint64_t DXContainerYAML::ShaderFeatureFlags::getEncodedFlags() {
   uint64_t Flag = 0;
 #define SHADER_FEATURE_FLAG(Num, DxilModuleNum, Val, Str)                      \

>From e6553158dbfd718a2e9d76d6209cc36666004abf Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Fri, 23 May 2025 01:00:24 +0000
Subject: [PATCH 28/29] move to namespace

---
 llvm/include/llvm/BinaryFormat/DXContainer.h  | 52 ++++++++++---------
 .../llvm/MC/DXContainerRootSignature.h        | 20 +++----
 llvm/include/llvm/Object/DXContainer.h        | 17 +++---
 llvm/lib/MC/DXContainerRootSignature.cpp      |  9 ++--
 llvm/lib/Object/DXContainer.cpp               |  3 +-
 llvm/lib/ObjectYAML/DXContainerEmitter.cpp    |  6 +--
 llvm/lib/ObjectYAML/DXContainerYAML.cpp       |  5 +-
 llvm/lib/Target/DirectX/DXILRootSignature.cpp | 10 ++--
 8 files changed, 64 insertions(+), 58 deletions(-)

diff --git a/llvm/include/llvm/BinaryFormat/DXContainer.h b/llvm/include/llvm/BinaryFormat/DXContainer.h
index 82890bf814935..ef628cbc34c9d 100644
--- a/llvm/include/llvm/BinaryFormat/DXContainer.h
+++ b/llvm/include/llvm/BinaryFormat/DXContainer.h
@@ -587,31 +587,6 @@ static_assert(sizeof(ProgramSignatureElement) == 32,
               "ProgramSignatureElement is misaligned");
 namespace RTS0 {
 namespace v1 {
-struct RootDescriptor {
-  uint32_t ShaderRegister;
-  uint32_t RegisterSpace;
-  void swapBytes() {
-    sys::swapByteOrder(ShaderRegister);
-    sys::swapByteOrder(RegisterSpace);
-  }
-};
-} // namespace v1
-
-namespace v2 {
-struct RootDescriptor : public v1::RootDescriptor {
-  uint32_t Flags;
-
-  RootDescriptor() = default;
-  explicit RootDescriptor(v1::RootDescriptor &Base)
-      : v1::RootDescriptor(Base), Flags(0u) {}
-
-  void swapBytes() {
-    v1::RootDescriptor::swapBytes();
-    sys::swapByteOrder(Flags);
-  }
-};
-} // namespace v2
-} // namespace RTS0
 // following dx12 naming
 // https://learn.microsoft.com/en-us/windows/win32/api/d3d12/ns-d3d12-d3d12_root_constants
 struct RootConstants {
@@ -655,6 +630,33 @@ struct RootSignatureHeader {
     sys::swapByteOrder(Flags);
   }
 };
+
+struct RootDescriptor {
+  uint32_t ShaderRegister;
+  uint32_t RegisterSpace;
+  void swapBytes() {
+    sys::swapByteOrder(ShaderRegister);
+    sys::swapByteOrder(RegisterSpace);
+  }
+};
+} // namespace v1
+
+namespace v2 {
+struct RootDescriptor : public v1::RootDescriptor {
+  uint32_t Flags;
+
+  RootDescriptor() = default;
+  explicit RootDescriptor(v1::RootDescriptor &Base)
+      : v1::RootDescriptor(Base), Flags(0u) {}
+
+  void swapBytes() {
+    v1::RootDescriptor::swapBytes();
+    sys::swapByteOrder(Flags);
+  }
+};
+} // namespace v2
+} // namespace RTS0
+
 } // namespace dxbc
 } // namespace llvm
 
diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h b/llvm/include/llvm/MC/DXContainerRootSignature.h
index 3496b5fff398f..5f5919122b3c5 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -16,36 +16,36 @@ class raw_ostream;
 namespace mcdxbc {
 
 struct RootParameterInfo {
-  dxbc::RootParameterHeader Header;
+  dxbc::RTS0::v1::RootParameterHeader Header;
   size_t Location;
 
   RootParameterInfo() = default;
 
-  RootParameterInfo(dxbc::RootParameterHeader Header, size_t Location)
+  RootParameterInfo(dxbc::RTS0::v1::RootParameterHeader Header, size_t Location)
       : Header(Header), Location(Location) {}
 };
 
 struct RootParametersContainer {
   SmallVector<RootParameterInfo> ParametersInfo;
 
-  SmallVector<dxbc::RootConstants> Constants;
+  SmallVector<dxbc::RTS0::v1::RootConstants> Constants;
   SmallVector<dxbc::RTS0::v2::RootDescriptor> Descriptors;
 
-  void addInfo(dxbc::RootParameterHeader Header, size_t Location) {
+  void addInfo(dxbc::RTS0::v1::RootParameterHeader Header, size_t Location) {
     ParametersInfo.push_back(RootParameterInfo(Header, Location));
   }
 
-  void addParameter(dxbc::RootParameterHeader Header,
-                    dxbc::RootConstants Constant) {
+  void addParameter(dxbc::RTS0::v1::RootParameterHeader Header,
+                    dxbc::RTS0::v1::RootConstants Constant) {
     addInfo(Header, Constants.size());
     Constants.push_back(Constant);
   }
 
-  void addInvalidParameter(dxbc::RootParameterHeader Header) {
+  void addInvalidParameter(dxbc::RTS0::v1::RootParameterHeader Header) {
     addInfo(Header, -1);
   }
 
-  void addParameter(dxbc::RootParameterHeader Header,
+  void addParameter(dxbc::RTS0::v1::RootParameterHeader Header,
                     dxbc::RTS0::v2::RootDescriptor Descriptor) {
     addInfo(Header, Descriptors.size());
     Descriptors.push_back(Descriptor);
@@ -57,12 +57,12 @@ struct RootParametersContainer {
     return {Info.Header.ParameterType, Info.Location};
   }
 
-  const dxbc::RootParameterHeader &getHeader(size_t Location) const {
+  const dxbc::RTS0::v1::RootParameterHeader &getHeader(size_t Location) const {
     const RootParameterInfo &Info = ParametersInfo[Location];
     return Info.Header;
   }
 
-  const dxbc::RootConstants &getConstant(size_t Index) const {
+  const dxbc::RTS0::v1::RootConstants &getConstant(size_t Index) const {
     return Constants[Index];
   }
 
diff --git a/llvm/include/llvm/Object/DXContainer.h b/llvm/include/llvm/Object/DXContainer.h
index 61bfa9411cc57..37cd5ca7dc935 100644
--- a/llvm/include/llvm/Object/DXContainer.h
+++ b/llvm/include/llvm/Object/DXContainer.h
@@ -121,10 +121,10 @@ template <typename T> struct ViewArray {
 
 namespace DirectX {
 struct RootParameterView {
-  const dxbc::RootParameterHeader &Header;
+  const dxbc::RTS0::v1::RootParameterHeader &Header;
   StringRef ParamData;
 
-  RootParameterView(const dxbc::RootParameterHeader &H, StringRef P)
+  RootParameterView(const dxbc::RTS0::v1::RootParameterHeader &H, StringRef P)
       : Header(H), ParamData(P) {}
 
   template <typename T> Expected<T> readParameter() {
@@ -147,8 +147,8 @@ struct RootConstantView : RootParameterView {
            (uint32_t)dxbc::RootParameterType::Constants32Bit;
   }
 
-  llvm::Expected<dxbc::RootConstants> read() {
-    return readParameter<dxbc::RootConstants>();
+  llvm::Expected<dxbc::RTS0::v1::RootConstants> read() {
+    return readParameter<dxbc::RTS0::v1::RootConstants>();
   }
 };
 
@@ -189,10 +189,11 @@ class RootSignature {
   uint32_t NumStaticSamplers;
   uint32_t StaticSamplersOffset;
   uint32_t Flags;
-  ViewArray<dxbc::RootParameterHeader> ParametersHeaders;
+  ViewArray<dxbc::RTS0::v1::RootParameterHeader> ParametersHeaders;
   StringRef PartData;
 
-  using param_header_iterator = ViewArray<dxbc::RootParameterHeader>::iterator;
+  using param_header_iterator =
+      ViewArray<dxbc::RTS0::v1::RootParameterHeader>::iterator;
 
 public:
   RootSignature(StringRef PD) : PartData(PD) {}
@@ -210,7 +211,7 @@ class RootSignature {
   uint32_t getFlags() const { return Flags; }
 
   llvm::Expected<RootParameterView>
-  getParameter(const dxbc::RootParameterHeader &Header) const {
+  getParameter(const dxbc::RTS0::v1::RootParameterHeader &Header) const {
     size_t DataSize;
 
     if (!dxbc::isValidParameterType(Header.ParameterType))
@@ -218,7 +219,7 @@ class RootSignature {
 
     switch (static_cast<dxbc::RootParameterType>(Header.ParameterType)) {
     case dxbc::RootParameterType::Constants32Bit:
-      DataSize = sizeof(dxbc::RootConstants);
+      DataSize = sizeof(dxbc::RTS0::v1::RootConstants);
       break;
     case dxbc::RootParameterType::CBV:
     case dxbc::RootParameterType::SRV:
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp b/llvm/lib/MC/DXContainerRootSignature.cpp
index a9394541d18da..3a4bd8321eb95 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -29,13 +29,14 @@ static void rewriteOffsetToCurrentByte(raw_svector_ostream &Stream,
 }
 
 size_t RootSignatureDesc::getSize() const {
-  size_t Size = sizeof(dxbc::RootSignatureHeader) +
-                ParametersContainer.size() * sizeof(dxbc::RootParameterHeader);
+  size_t Size =
+      sizeof(dxbc::RTS0::v1::RootSignatureHeader) +
+      ParametersContainer.size() * sizeof(dxbc::RTS0::v1::RootParameterHeader);
 
   for (const RootParameterInfo &I : ParametersContainer) {
     switch (I.Header.ParameterType) {
     case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
-      Size += sizeof(dxbc::RootConstants);
+      Size += sizeof(dxbc::RTS0::v1::RootConstants);
       break;
     case llvm::to_underlying(dxbc::RootParameterType::CBV):
     case llvm::to_underlying(dxbc::RootParameterType::SRV):
@@ -81,7 +82,7 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
     const auto &[Type, Loc] = ParametersContainer.getTypeAndLocForParameter(I);
     switch (Type) {
     case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit): {
-      const dxbc::RootConstants &Constants =
+      const dxbc::RTS0::v1::RootConstants &Constants =
           ParametersContainer.getConstant(Loc);
       support::endian::write(BOS, Constants.ShaderRegister,
                              llvm::endianness::little);
diff --git a/llvm/lib/Object/DXContainer.cpp b/llvm/lib/Object/DXContainer.cpp
index 95f6788e75aa6..2d05566626bfc 100644
--- a/llvm/lib/Object/DXContainer.cpp
+++ b/llvm/lib/Object/DXContainer.cpp
@@ -273,7 +273,8 @@ Error DirectX::RootSignature::parse() {
   Current += sizeof(uint32_t);
 
   ParametersHeaders.Data = PartData.substr(
-      RootParametersOffset, NumParameters * sizeof(dxbc::RootParameterHeader));
+      RootParametersOffset,
+      NumParameters * sizeof(dxbc::RTS0::v1::RootParameterHeader));
 
   return Error::success();
 }
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index ace2eca5072bd..71a87f6aa24fc 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -274,12 +274,12 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
       RS.StaticSamplersOffset = P.RootSignature->StaticSamplersOffset;
 
       for (const auto &Param : P.RootSignature->Parameters) {
-        auto Header = dxbc::RootParameterHeader{Param.Type, Param.Visibility,
-                                                Param.Offset};
+        auto Header = dxbc::RTS0::v1::RootParameterHeader{
+            Param.Type, Param.Visibility, Param.Offset};
 
         if (auto *ConstantYaml =
                 std::get_if<DXContainerYAML::RootConstantsYaml>(&Param.Data)) {
-          dxbc::RootConstants Constants;
+          dxbc::RTS0::v1::RootConstants Constants;
           Constants.Num32BitValues = ConstantYaml->Num32BitValues;
           Constants.RegisterSpace = ConstantYaml->RegisterSpace;
           Constants.ShaderRegister = ConstantYaml->ShaderRegister;
diff --git a/llvm/lib/ObjectYAML/DXContainerYAML.cpp b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
index fdb039e75fdda..b824a408e30a6 100644
--- a/llvm/lib/ObjectYAML/DXContainerYAML.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerYAML.cpp
@@ -47,7 +47,7 @@ DXContainerYAML::RootSignatureYamlDesc::create(
   RootSigDesc.RootParametersOffset = Data.getRootParametersOffset();
 
   uint32_t Flags = Data.getFlags();
-  for (const dxbc::RootParameterHeader &PH : Data.param_headers()) {
+  for (const dxbc::RTS0::v1::RootParameterHeader &PH : Data.param_headers()) {
 
     if (!dxbc::isValidParameterType(PH.ParameterType))
       return createStringError(std::errc::invalid_argument,
@@ -70,7 +70,8 @@ DXContainerYAML::RootSignatureYamlDesc::create(
     object::DirectX::RootParameterView ParamView = ParamViewOrErr.get();
 
     if (auto *RCV = dyn_cast<object::DirectX::RootConstantView>(&ParamView)) {
-      llvm::Expected<dxbc::RootConstants> ConstantsOrErr = RCV->read();
+      llvm::Expected<dxbc::RTS0::v1::RootConstants> ConstantsOrErr =
+          RCV->read();
       if (Error E = ConstantsOrErr.takeError())
         return std::move(E);
 
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index 43e06ee278b49..40277899b5c7e 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -75,7 +75,7 @@ static bool parseRootConstants(LLVMContext *Ctx, mcdxbc::RootSignatureDesc &RSD,
   if (RootConstantNode->getNumOperands() != 5)
     return reportError(Ctx, "Invalid format for RootConstants Element");
 
-  dxbc::RootParameterHeader Header;
+  dxbc::RTS0::v1::RootParameterHeader Header;
   // The parameter offset doesn't matter here - we recalculate it during
   // serialization  Header.ParameterOffset = 0;
   Header.ParameterType =
@@ -86,7 +86,7 @@ static bool parseRootConstants(LLVMContext *Ctx, mcdxbc::RootSignatureDesc &RSD,
   else
     return reportError(Ctx, "Invalid value for ShaderVisibility");
 
-  dxbc::RootConstants Constants;
+  dxbc::RTS0::v1::RootConstants Constants;
   if (std::optional<uint32_t> Val = extractMdIntValue(RootConstantNode, 2))
     Constants.ShaderRegister = *Val;
   else
@@ -247,7 +247,7 @@ analyzeModule(Module &M) {
     // Clang emits the root signature data in dxcontainer following a specific
     // sequence. First the header, then the root parameters. So the header
     // offset will always equal to the header size.
-    RSD.RootParameterOffset = sizeof(dxbc::RootSignatureHeader);
+    RSD.RootParameterOffset = sizeof(dxbc::RTS0::v1::RootSignatureHeader);
 
     if (parse(Ctx, RSD, RootElementListNode) || validate(Ctx, RSD)) {
       return RSDMap;
@@ -296,7 +296,7 @@ PreservedAnalyses RootSignatureAnalysisPrinter::run(Module &M,
     for (size_t I = 0; I < RS.ParametersContainer.size(); I++) {
       const auto &[Type, Loc] =
           RS.ParametersContainer.getTypeAndLocForParameter(I);
-      const dxbc::RootParameterHeader Header =
+      const dxbc::RTS0::v1::RootParameterHeader Header =
           RS.ParametersContainer.getHeader(I);
 
       OS << indent(Space) << "- Parameter Type: " << Type << "\n";
@@ -305,7 +305,7 @@ PreservedAnalyses RootSignatureAnalysisPrinter::run(Module &M,
 
       switch (Type) {
       case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit): {
-        const dxbc::RootConstants &Constants =
+        const dxbc::RTS0::v1::RootConstants &Constants =
             RS.ParametersContainer.getConstant(Loc);
         OS << indent(Space + 2) << "Register Space: " << Constants.RegisterSpace
            << "\n";

>From 3094a758cd2ab9537bcb288527d26388ed1553fe Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saffran at microsoft.com>
Date: Fri, 23 May 2025 01:18:57 +0000
Subject: [PATCH 29/29] cleanup

---
 llvm/include/llvm/BinaryFormat/DXContainer.h | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/llvm/include/llvm/BinaryFormat/DXContainer.h b/llvm/include/llvm/BinaryFormat/DXContainer.h
index ef628cbc34c9d..3494e0fe1a0e9 100644
--- a/llvm/include/llvm/BinaryFormat/DXContainer.h
+++ b/llvm/include/llvm/BinaryFormat/DXContainer.h
@@ -585,8 +585,18 @@ struct ProgramSignatureElement {
 
 static_assert(sizeof(ProgramSignatureElement) == 32,
               "ProgramSignatureElement is misaligned");
+
 namespace RTS0 {
 namespace v1 {
+struct RootDescriptor {
+  uint32_t ShaderRegister;
+  uint32_t RegisterSpace;
+  void swapBytes() {
+    sys::swapByteOrder(ShaderRegister);
+    sys::swapByteOrder(RegisterSpace);
+  }
+};
+
 // following dx12 naming
 // https://learn.microsoft.com/en-us/windows/win32/api/d3d12/ns-d3d12-d3d12_root_constants
 struct RootConstants {
@@ -630,15 +640,6 @@ struct RootSignatureHeader {
     sys::swapByteOrder(Flags);
   }
 };
-
-struct RootDescriptor {
-  uint32_t ShaderRegister;
-  uint32_t RegisterSpace;
-  void swapBytes() {
-    sys::swapByteOrder(ShaderRegister);
-    sys::swapByteOrder(RegisterSpace);
-  }
-};
 } // namespace v1
 
 namespace v2 {



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