[clang] Reland [NVPTX] Add support for maxclusterrank in launch_bounds (#66496) (PR #67667)

Jakub Chlanda via cfe-commits cfe-commits at lists.llvm.org
Thu Sep 28 05:49:19 PDT 2023


https://github.com/jchlanda created https://github.com/llvm/llvm-project/pull/67667

This reverts commit 0afbcb20fd908f8bf9073697423da097be7db592.

>From d8c1372998a74dfbfea921bf049575e5e9c0c5a7 Mon Sep 17 00:00:00 2001
From: Jakub Chlanda <jakub at codeplay.com>
Date: Thu, 28 Sep 2023 13:30:27 +0100
Subject: [PATCH] Reland [NVPTX] Add support for maxclusterrank in
 launch_bounds (#66496)

This reverts commit 0afbcb20fd908f8bf9073697423da097be7db592.
---
 clang/include/clang/Basic/Attr.td             |  3 +-
 .../clang/Basic/DiagnosticSemaKinds.td        |  4 +
 clang/include/clang/Sema/Sema.h               |  5 +-
 clang/lib/Basic/Targets/NVPTX.h               |  2 +
 clang/lib/CodeGen/Targets/NVPTX.cpp           | 12 ++-
 clang/lib/Parse/ParseOpenMP.cpp               |  3 +-
 clang/lib/Sema/SemaDeclAttr.cpp               | 43 ++++++++---
 .../lib/Sema/SemaTemplateInstantiateDecl.cpp  | 10 ++-
 clang/test/CodeGenCUDA/launch-bounds.cu       | 69 +++++++++++++++++
 clang/test/SemaCUDA/launch_bounds.cu          |  7 +-
 clang/test/SemaCUDA/launch_bounds_sm_90.cu    | 57 ++++++++++++++
 llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp     | 77 ++++++++-----------
 llvm/lib/Target/NVPTX/NVPTXUtilities.cpp      |  4 +
 llvm/lib/Target/NVPTX/NVPTXUtilities.h        |  1 +
 llvm/test/CodeGen/NVPTX/maxclusterrank.ll     | 26 +++++++
 15 files changed, 262 insertions(+), 61 deletions(-)
 create mode 100644 clang/test/SemaCUDA/launch_bounds_sm_90.cu
 create mode 100644 llvm/test/CodeGen/NVPTX/maxclusterrank.ll

diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
index dd4d45171db4899..fbc27d166ed9dd1 100644
--- a/clang/include/clang/Basic/Attr.td
+++ b/clang/include/clang/Basic/Attr.td
@@ -1267,7 +1267,8 @@ def CUDAInvalidTarget : InheritableAttr {
 
 def CUDALaunchBounds : InheritableAttr {
   let Spellings = [GNU<"launch_bounds">, Declspec<"__launch_bounds__">];
-  let Args = [ExprArgument<"MaxThreads">, ExprArgument<"MinBlocks", 1>];
+  let Args = [ExprArgument<"MaxThreads">, ExprArgument<"MinBlocks", 1>,
+              ExprArgument<"MaxBlocks", 1>];
   let LangOpts = [CUDA];
   let Subjects = SubjectList<[ObjCMethod, FunctionLike]>;
   // An AST node is created for this attribute, but is not used by other parts
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index f4eb02fd9570c2f..29362df68365350 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -11850,6 +11850,10 @@ def err_sycl_special_type_num_init_method : Error<
   "types with 'sycl_special_class' attribute must have one and only one '__init' "
   "method defined">;
 
+def warn_cuda_maxclusterrank_sm_90 : Warning<
+  "maxclusterrank requires sm_90 or higher, CUDA arch provided: %0, ignoring "
+  "%1 attribute">, InGroup<IgnoredAttributes>;
+
 def err_bit_int_bad_size : Error<"%select{signed|unsigned}0 _BitInt must "
                                  "have a bit size of at least %select{2|1}0">;
 def err_bit_int_max_size : Error<"%select{signed|unsigned}0 _BitInt of bit "
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 712db0a3dd895d5..e13524b5f3b30cf 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -11053,12 +11053,13 @@ class Sema final {
   /// Create an CUDALaunchBoundsAttr attribute.
   CUDALaunchBoundsAttr *CreateLaunchBoundsAttr(const AttributeCommonInfo &CI,
                                                Expr *MaxThreads,
-                                               Expr *MinBlocks);
+                                               Expr *MinBlocks,
+                                               Expr *MaxBlocks);
 
   /// AddLaunchBoundsAttr - Adds a launch_bounds attribute to a particular
   /// declaration.
   void AddLaunchBoundsAttr(Decl *D, const AttributeCommonInfo &CI,
-                           Expr *MaxThreads, Expr *MinBlocks);
+                           Expr *MaxThreads, Expr *MinBlocks, Expr *MaxBlocks);
 
   /// AddModeAttr - Adds a mode attribute to a particular declaration.
   void AddModeAttr(Decl *D, const AttributeCommonInfo &CI, IdentifierInfo *Name,
diff --git a/clang/lib/Basic/Targets/NVPTX.h b/clang/lib/Basic/Targets/NVPTX.h
index 6fa0b8df97d7894..20d76b702a9426e 100644
--- a/clang/lib/Basic/Targets/NVPTX.h
+++ b/clang/lib/Basic/Targets/NVPTX.h
@@ -181,6 +181,8 @@ class LLVM_LIBRARY_VISIBILITY NVPTXTargetInfo : public TargetInfo {
 
   bool hasBitIntType() const override { return true; }
   bool hasBFloat16Type() const override { return true; }
+
+  CudaArch getGPU() const { return GPU; }
 };
 } // namespace targets
 } // namespace clang
diff --git a/clang/lib/CodeGen/Targets/NVPTX.cpp b/clang/lib/CodeGen/Targets/NVPTX.cpp
index 0d4bbd795648008..64d019a10514d60 100644
--- a/clang/lib/CodeGen/Targets/NVPTX.cpp
+++ b/clang/lib/CodeGen/Targets/NVPTX.cpp
@@ -296,8 +296,8 @@ void CodeGenModule::handleCUDALaunchBoundsAttr(
     NVPTXTargetCodeGenInfo::addNVVMMetadata(F, "maxntidx",
                                             MaxThreads.getExtValue());
 
-  // min blocks is an optional argument for CUDALaunchBoundsAttr. If it was
-  // not specified in __launch_bounds__ or if the user specified a 0 value,
+  // min and max blocks is an optional argument for CUDALaunchBoundsAttr. If it
+  // was not specified in __launch_bounds__ or if the user specified a 0 value,
   // we don't have to add a PTX directive.
   if (Attr->getMinBlocks()) {
     llvm::APSInt MinBlocks(32);
@@ -307,6 +307,14 @@ void CodeGenModule::handleCUDALaunchBoundsAttr(
       NVPTXTargetCodeGenInfo::addNVVMMetadata(F, "minctasm",
                                               MinBlocks.getExtValue());
   }
+  if (Attr->getMaxBlocks()) {
+    llvm::APSInt MaxBlocks(32);
+    MaxBlocks = Attr->getMaxBlocks()->EvaluateKnownConstInt(getContext());
+    if (MaxBlocks > 0)
+      // Create !{<func-ref>, metadata !"maxclusterrank", i32 <val>} node
+      NVPTXTargetCodeGenInfo::addNVVMMetadata(F, "maxclusterrank",
+                                              MaxBlocks.getExtValue());
+  }
 }
 
 std::unique_ptr<TargetCodeGenInfo>
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 605b97617432ed3..8a8a126bf7244d4 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -3739,7 +3739,8 @@ OMPClause *Parser::ParseOpenMPOMPXAttributesClause(bool ParseOnly) {
         continue;
       if (auto *A = Actions.CreateLaunchBoundsAttr(
               PA, PA.getArgAsExpr(0),
-              PA.getNumArgs() > 1 ? PA.getArgAsExpr(1) : nullptr))
+              PA.getNumArgs() > 1 ? PA.getArgAsExpr(1) : nullptr,
+              PA.getNumArgs() > 2 ? PA.getArgAsExpr(2) : nullptr))
         Attrs.push_back(A);
       continue;
     default:
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 090a54eedaa07d0..a17378675b22777 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -5608,6 +5608,14 @@ bool Sema::CheckRegparmAttr(const ParsedAttr &AL, unsigned &numParams) {
   return false;
 }
 
+// Helper to get CudaArch.
+static CudaArch getCudaArch(const TargetInfo &TI) {
+  if (!TI.getTriple().isNVPTX())
+    llvm_unreachable("getCudaArch is only valid for NVPTX triple");
+  auto &TO = TI.getTargetOpts();
+  return StringToCudaArch(TO.CPU);
+}
+
 // Checks whether an argument of launch_bounds attribute is
 // acceptable, performs implicit conversion to Rvalue, and returns
 // non-nullptr Expr result on success. Otherwise, it returns nullptr
@@ -5651,34 +5659,51 @@ static Expr *makeLaunchBoundsArgExpr(Sema &S, Expr *E,
 
 CUDALaunchBoundsAttr *
 Sema::CreateLaunchBoundsAttr(const AttributeCommonInfo &CI, Expr *MaxThreads,
-                             Expr *MinBlocks) {
-  CUDALaunchBoundsAttr TmpAttr(Context, CI, MaxThreads, MinBlocks);
+                             Expr *MinBlocks, Expr *MaxBlocks) {
+  CUDALaunchBoundsAttr TmpAttr(Context, CI, MaxThreads, MinBlocks, MaxBlocks);
   MaxThreads = makeLaunchBoundsArgExpr(*this, MaxThreads, TmpAttr, 0);
-  if (MaxThreads == nullptr)
+  if (!MaxThreads)
     return nullptr;
 
   if (MinBlocks) {
     MinBlocks = makeLaunchBoundsArgExpr(*this, MinBlocks, TmpAttr, 1);
-    if (MinBlocks == nullptr)
+    if (!MinBlocks)
       return nullptr;
   }
 
+  if (MaxBlocks) {
+    // '.maxclusterrank' ptx directive requires .target sm_90 or higher.
+    auto SM = getCudaArch(Context.getTargetInfo());
+    if (SM == CudaArch::UNKNOWN || SM < CudaArch::SM_90) {
+      Diag(MaxBlocks->getBeginLoc(), diag::warn_cuda_maxclusterrank_sm_90)
+          << CudaArchToString(SM) << CI << MaxBlocks->getSourceRange();
+      // Ignore it by setting MaxBlocks to null;
+      MaxBlocks = nullptr;
+    } else {
+      MaxBlocks = makeLaunchBoundsArgExpr(*this, MaxBlocks, TmpAttr, 2);
+      if (!MaxBlocks)
+        return nullptr;
+    }
+  }
+
   return ::new (Context)
-      CUDALaunchBoundsAttr(Context, CI, MaxThreads, MinBlocks);
+      CUDALaunchBoundsAttr(Context, CI, MaxThreads, MinBlocks, MaxBlocks);
 }
 
 void Sema::AddLaunchBoundsAttr(Decl *D, const AttributeCommonInfo &CI,
-                               Expr *MaxThreads, Expr *MinBlocks) {
-  if (auto *Attr = CreateLaunchBoundsAttr(CI, MaxThreads, MinBlocks))
+                               Expr *MaxThreads, Expr *MinBlocks,
+                               Expr *MaxBlocks) {
+  if (auto *Attr = CreateLaunchBoundsAttr(CI, MaxThreads, MinBlocks, MaxBlocks))
     D->addAttr(Attr);
 }
 
 static void handleLaunchBoundsAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
-  if (!AL.checkAtLeastNumArgs(S, 1) || !AL.checkAtMostNumArgs(S, 2))
+  if (!AL.checkAtLeastNumArgs(S, 1) || !AL.checkAtMostNumArgs(S, 3))
     return;
 
   S.AddLaunchBoundsAttr(D, AL, AL.getArgAsExpr(0),
-                        AL.getNumArgs() > 1 ? AL.getArgAsExpr(1) : nullptr);
+                        AL.getNumArgs() > 1 ? AL.getArgAsExpr(1) : nullptr,
+                        AL.getNumArgs() > 2 ? AL.getArgAsExpr(2) : nullptr);
 }
 
 static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D,
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index fa839e9b71a3cf9..1aa4036756f3692 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -302,7 +302,15 @@ static void instantiateDependentCUDALaunchBoundsAttr(
     MinBlocks = Result.getAs<Expr>();
   }
 
-  S.AddLaunchBoundsAttr(New, Attr, MaxThreads, MinBlocks);
+  Expr *MaxBlocks = nullptr;
+  if (Attr.getMaxBlocks()) {
+    Result = S.SubstExpr(Attr.getMaxBlocks(), TemplateArgs);
+    if (Result.isInvalid())
+      return;
+    MaxBlocks = Result.getAs<Expr>();
+  }
+
+  S.AddLaunchBoundsAttr(New, Attr, MaxThreads, MinBlocks, MaxBlocks);
 }
 
 static void
diff --git a/clang/test/CodeGenCUDA/launch-bounds.cu b/clang/test/CodeGenCUDA/launch-bounds.cu
index 58bcc410201f35f..31ca9216b413e92 100644
--- a/clang/test/CodeGenCUDA/launch-bounds.cu
+++ b/clang/test/CodeGenCUDA/launch-bounds.cu
@@ -1,9 +1,13 @@
 // RUN: %clang_cc1 %s -triple nvptx-unknown-unknown -fcuda-is-device -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 %s -triple nvptx-unknown-unknown -target-cpu sm_90 -DUSE_MAX_BLOCKS -fcuda-is-device -emit-llvm -o - | FileCheck -check-prefix=CHECK_MAX_BLOCKS %s
 
 #include "Inputs/cuda.h"
 
 #define MAX_THREADS_PER_BLOCK 256
 #define MIN_BLOCKS_PER_MP     2
+#ifdef USE_MAX_BLOCKS
+#define MAX_BLOCKS_PER_MP     4
+#endif
 
 // Test both max threads per block and Min cta per sm.
 extern "C" {
@@ -17,6 +21,21 @@ Kernel1()
 // CHECK: !{{[0-9]+}} = !{ptr @Kernel1, !"maxntidx", i32 256}
 // CHECK: !{{[0-9]+}} = !{ptr @Kernel1, !"minctasm", i32 2}
 
+#ifdef USE_MAX_BLOCKS
+// Test max threads per block and min/max cta per sm.
+extern "C" {
+__global__ void
+__launch_bounds__( MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP, MAX_BLOCKS_PER_MP )
+Kernel1_sm_90()
+{
+}
+}
+
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @Kernel1_sm_90, !"maxntidx", i32 256}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @Kernel1_sm_90, !"minctasm", i32 2}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @Kernel1_sm_90, !"maxclusterrank", i32 4}
+#endif // USE_MAX_BLOCKS
+
 // Test only max threads per block. Min cta per sm defaults to 0, and
 // CodeGen doesn't output a zero value for minctasm.
 extern "C" {
@@ -50,6 +69,20 @@ template __global__ void Kernel4<MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP>();
 // CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4{{.*}}, !"maxntidx", i32 256}
 // CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4{{.*}}, !"minctasm", i32 2}
 
+#ifdef USE_MAX_BLOCKS
+template <int max_threads_per_block, int min_blocks_per_mp, int max_blocks_per_mp>
+__global__ void
+__launch_bounds__(max_threads_per_block, min_blocks_per_mp, max_blocks_per_mp)
+Kernel4_sm_90()
+{
+}
+template __global__ void Kernel4_sm_90<MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP, MAX_BLOCKS_PER_MP>();
+
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4_sm_90{{.*}}, !"maxntidx", i32 256}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4_sm_90{{.*}}, !"minctasm", i32 2}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4_sm_90{{.*}}, !"maxclusterrank", i32 4}
+#endif //USE_MAX_BLOCKS
+
 const int constint = 100;
 template <int max_threads_per_block, int min_blocks_per_mp>
 __global__ void
@@ -63,6 +96,23 @@ template __global__ void Kernel5<MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP>();
 // CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5{{.*}}, !"maxntidx", i32 356}
 // CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5{{.*}}, !"minctasm", i32 258}
 
+#ifdef USE_MAX_BLOCKS
+
+template <int max_threads_per_block, int min_blocks_per_mp, int max_blocks_per_mp>
+__global__ void
+__launch_bounds__(max_threads_per_block + constint,
+                  min_blocks_per_mp + max_threads_per_block,
+                  max_blocks_per_mp + max_threads_per_block)
+Kernel5_sm_90()
+{
+}
+template __global__ void Kernel5_sm_90<MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP, MAX_BLOCKS_PER_MP>();
+
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5_sm_90{{.*}}, !"maxntidx", i32 356}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5_sm_90{{.*}}, !"minctasm", i32 258}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5_sm_90{{.*}}, !"maxclusterrank", i32 260}
+#endif //USE_MAX_BLOCKS
+
 // Make sure we don't emit negative launch bounds values.
 __global__ void
 __launch_bounds__( -MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP )
@@ -80,7 +130,26 @@ Kernel7()
 // CHECK:     !{{[0-9]+}} = !{ptr @{{.*}}Kernel7{{.*}}, !"maxntidx",
 // CHECK-NOT: !{{[0-9]+}} = !{ptr @{{.*}}Kernel7{{.*}}, !"minctasm",
 
+#ifdef USE_MAX_BLOCKS
+__global__ void
+__launch_bounds__( MAX_THREADS_PER_BLOCK, -MIN_BLOCKS_PER_MP, -MAX_BLOCKS_PER_MP )
+Kernel7_sm_90()
+{
+}
+// CHECK_MAX_BLOCKS:     !{{[0-9]+}} = !{ptr @{{.*}}Kernel7_sm_90{{.*}}, !"maxntidx",
+// CHECK_MAX_BLOCKS-NOT: !{{[0-9]+}} = !{ptr @{{.*}}Kernel7_sm_90{{.*}}, !"minctasm",
+// CHECK_MAX_BLOCKS-NOT: !{{[0-9]+}} = !{ptr @{{.*}}Kernel7_sm_90{{.*}}, !"maxclusterrank",
+#endif // USE_MAX_BLOCKS
+
 const char constchar = 12;
 __global__ void __launch_bounds__(constint, constchar) Kernel8() {}
 // CHECK:     !{{[0-9]+}} = !{ptr @{{.*}}Kernel8{{.*}}, !"maxntidx", i32 100
 // CHECK:     !{{[0-9]+}} = !{ptr @{{.*}}Kernel8{{.*}}, !"minctasm", i32 12
+
+#ifdef USE_MAX_BLOCKS
+const char constchar_2 = 14;
+__global__ void __launch_bounds__(constint, constchar, constchar_2) Kernel8_sm_90() {}
+// CHECK_MAX_BLOCKS:     !{{[0-9]+}} = !{ptr @{{.*}}Kernel8_sm_90{{.*}}, !"maxntidx", i32 100
+// CHECK_MAX_BLOCKS:     !{{[0-9]+}} = !{ptr @{{.*}}Kernel8_sm_90{{.*}}, !"minctasm", i32 12
+// CHECK_MAX_BLOCKS:     !{{[0-9]+}} = !{ptr @{{.*}}Kernel8_sm_90{{.*}}, !"maxclusterrank", i32 14
+#endif // USE_MAX_BLOCKS
diff --git a/clang/test/SemaCUDA/launch_bounds.cu b/clang/test/SemaCUDA/launch_bounds.cu
index 0ca0c0145d8bbb6..045f4756929593c 100644
--- a/clang/test/SemaCUDA/launch_bounds.cu
+++ b/clang/test/SemaCUDA/launch_bounds.cu
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -triple nvptx-unknown-unknown -target-cpu sm_75 -verify %s
 
 #include "Inputs/cuda.h"
 
@@ -11,8 +11,9 @@ __launch_bounds__(0x10000000000000000) void TestWayTooBigArg(void); // expected-
 
 __launch_bounds__(-128, 7) void TestNegArg1(void); // expected-warning {{'launch_bounds' attribute parameter 0 is negative and will be ignored}}
 __launch_bounds__(128, -7) void TestNegArg2(void); // expected-warning {{'launch_bounds' attribute parameter 1 is negative and will be ignored}}
+__launch_bounds__(128, 2, -8) void TestNegArg2(void); // expected-warning {{maxclusterrank requires sm_90 or higher, CUDA arch provided: sm_75, ignoring 'launch_bounds' attribute}}
 
-__launch_bounds__(1, 2, 3) void Test3Args(void); // expected-error {{'launch_bounds' attribute takes no more than 2 arguments}}
+__launch_bounds__(1, 2, 3, 4) void Test4Args(void); // expected-error {{'launch_bounds' attribute takes no more than 3 arguments}}
 __launch_bounds__() void TestNoArgs(void); // expected-error {{'launch_bounds' attribute takes at least 1 argument}}
 
 int TestNoFunction __launch_bounds__(128, 7); // expected-warning {{'launch_bounds' attribute only applies to Objective-C methods, functions, and function pointers}}
@@ -47,3 +48,5 @@ __launch_bounds__(Args) void TestTemplateVariadicArgs(void) {} // expected-error
 
 template <int... Args>
 __launch_bounds__(1, Args) void TestTemplateVariadicArgs2(void) {} // expected-error {{expression contains unexpanded parameter pack 'Args'}}
+
+__launch_bounds__(1, 2, 3) void Test3Args(void); // expected-warning {{maxclusterrank requires sm_90 or higher, CUDA arch provided: sm_75, ignoring 'launch_bounds' attribute}}
diff --git a/clang/test/SemaCUDA/launch_bounds_sm_90.cu b/clang/test/SemaCUDA/launch_bounds_sm_90.cu
new file mode 100644
index 000000000000000..d5d902816c64c62
--- /dev/null
+++ b/clang/test/SemaCUDA/launch_bounds_sm_90.cu
@@ -0,0 +1,57 @@
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -triple nvptx-unknown-unknown -target-cpu sm_90 -verify %s
+
+#include "Inputs/cuda.h"
+
+__launch_bounds__(128, 7) void Test2Args(void);
+__launch_bounds__(128) void Test1Arg(void);
+
+__launch_bounds__(0xffffffff) void TestMaxArg(void);
+__launch_bounds__(0x100000000) void TestTooBigArg(void); // expected-error {{integer constant expression evaluates to value 4294967296 that cannot be represented in a 32-bit unsigned integer type}}
+__launch_bounds__(0x10000000000000000) void TestWayTooBigArg(void); // expected-error {{integer literal is too large to be represented in any integer type}}
+__launch_bounds__(1, 1, 0x10000000000000000) void TestWayTooBigArg(void); // expected-error {{integer literal is too large to be represented in any integer type}}
+
+__launch_bounds__(-128, 7) void TestNegArg1(void); // expected-warning {{'launch_bounds' attribute parameter 0 is negative and will be ignored}}
+__launch_bounds__(128, -7) void TestNegArg2(void); // expected-warning {{'launch_bounds' attribute parameter 1 is negative and will be ignored}}
+__launch_bounds__(-128, 1, 7) void TestNegArg2(void); // expected-warning {{'launch_bounds' attribute parameter 0 is negative and will be ignored}}
+__launch_bounds__(128, -1, 7) void TestNegArg2(void); // expected-warning {{'launch_bounds' attribute parameter 1 is negative and will be ignored}}
+__launch_bounds__(128, 1, -7) void TestNegArg2(void); // expected-warning {{'launch_bounds' attribute parameter 2 is negative and will be ignored}}
+// expected-warning at 20 {{'launch_bounds' attribute parameter 0 is negative and will be ignored}}
+// expected-warning at 20 {{'launch_bounds' attribute parameter 1 is negative and will be ignored}}
+__launch_bounds__(-128, -1, 7) void TestNegArg2(void);
+// expected-warning at 23 {{'launch_bounds' attribute parameter 0 is negative and will be ignored}}
+// expected-warning at 23 {{'launch_bounds' attribute parameter 2 is negative and will be ignored}}
+__launch_bounds__(-128, 1, -7) void TestNegArg2(void);
+// expected-warning at 27 {{'launch_bounds' attribute parameter 0 is negative and will be ignored}}
+// expected-warning at 27 {{'launch_bounds' attribute parameter 1 is negative and will be ignored}}
+// expected-warning at 27 {{'launch_bounds' attribute parameter 2 is negative and will be ignored}}
+__launch_bounds__(-128, -1, -7) void TestNegArg2(void);
+
+
+__launch_bounds__(1, 2, 3, 4) void Test4Args(void); // expected-error {{'launch_bounds' attribute takes no more than 3 arguments}}
+__launch_bounds__() void TestNoArgs(void); // expected-error {{'launch_bounds' attribute takes at least 1 argument}}
+
+int TestNoFunction __launch_bounds__(128, 7, 13); // expected-warning {{'launch_bounds' attribute only applies to Objective-C methods, functions, and function pointers}}
+
+__launch_bounds__(true) void TestBool(void);
+__launch_bounds__(128, 1, 128.0) void TestFP(void); // expected-error {{'launch_bounds' attribute requires parameter 2 to be an integer constant}}
+__launch_bounds__(128, 1, (void*)0) void TestNullptr(void); // expected-error {{'launch_bounds' attribute requires parameter 2 to be an integer constant}}
+
+int nonconstint = 256;
+__launch_bounds__(125, 1, nonconstint) void TestNonConstInt(void); // expected-error {{'launch_bounds' attribute requires parameter 2 to be an integer constant}}
+
+const int constint = 512;
+__launch_bounds__(128, 1, constint) void TestConstInt(void);
+__launch_bounds__(128, 1, constint * 2 + 3) void TestConstIntExpr(void);
+
+template <int a, int b, int c> __launch_bounds__(a, b, c) void TestTemplate2Args(void) {}
+template void TestTemplate2Args<128,7, 13>(void);
+
+template <int a, int b, int c>
+__launch_bounds__(a + b, c + constint, a + b + c + constint) void TestTemplateExpr(void) {}
+template void TestTemplateExpr<128+constint, 3, 7>(void);
+
+template <int... Args>
+__launch_bounds__(Args) void TestTemplateVariadicArgs(void) {} // expected-error {{expression contains unexpanded parameter pack 'Args'}}
+
+template <int... Args>
+__launch_bounds__(1, 22, Args) void TestTemplateVariadicArgs2(void) {} // expected-error {{expression contains unexpanded parameter pack 'Args'}}
diff --git a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
index 5d6127419d6318e..c1df063d80f5ffb 100644
--- a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
@@ -537,59 +537,50 @@ void NVPTXAsmPrinter::emitKernelFunctionDirectives(const Function &F,
                                                    raw_ostream &O) const {
   // If the NVVM IR has some of reqntid* specified, then output
   // the reqntid directive, and set the unspecified ones to 1.
-  // If none of reqntid* is specified, don't output reqntid directive.
-  unsigned reqntidx, reqntidy, reqntidz;
-  bool specified = false;
-  if (!getReqNTIDx(F, reqntidx))
-    reqntidx = 1;
-  else
-    specified = true;
-  if (!getReqNTIDy(F, reqntidy))
-    reqntidy = 1;
-  else
-    specified = true;
-  if (!getReqNTIDz(F, reqntidz))
-    reqntidz = 1;
-  else
-    specified = true;
-
-  if (specified)
-    O << ".reqntid " << reqntidx << ", " << reqntidy << ", " << reqntidz
+  // If none of Reqntid* is specified, don't output reqntid directive.
+  unsigned Reqntidx, Reqntidy, Reqntidz;
+  Reqntidx = Reqntidy = Reqntidz = 1;
+  bool ReqSpecified = false;
+  ReqSpecified |= getReqNTIDx(F, Reqntidx);
+  ReqSpecified |= getReqNTIDy(F, Reqntidy);
+  ReqSpecified |= getReqNTIDz(F, Reqntidz);
+
+  if (ReqSpecified)
+    O << ".reqntid " << Reqntidx << ", " << Reqntidy << ", " << Reqntidz
       << "\n";
 
   // If the NVVM IR has some of maxntid* specified, then output
   // the maxntid directive, and set the unspecified ones to 1.
   // If none of maxntid* is specified, don't output maxntid directive.
-  unsigned maxntidx, maxntidy, maxntidz;
-  specified = false;
-  if (!getMaxNTIDx(F, maxntidx))
-    maxntidx = 1;
-  else
-    specified = true;
-  if (!getMaxNTIDy(F, maxntidy))
-    maxntidy = 1;
-  else
-    specified = true;
-  if (!getMaxNTIDz(F, maxntidz))
-    maxntidz = 1;
-  else
-    specified = true;
-
-  if (specified)
-    O << ".maxntid " << maxntidx << ", " << maxntidy << ", " << maxntidz
+  unsigned Maxntidx, Maxntidy, Maxntidz;
+  Maxntidx = Maxntidy = Maxntidz = 1;
+  bool MaxSpecified = false;
+  MaxSpecified |= getMaxNTIDx(F, Maxntidx);
+  MaxSpecified |= getMaxNTIDy(F, Maxntidy);
+  MaxSpecified |= getMaxNTIDz(F, Maxntidz);
+
+  if (MaxSpecified)
+    O << ".maxntid " << Maxntidx << ", " << Maxntidy << ", " << Maxntidz
       << "\n";
 
-  unsigned mincta;
-  if (getMinCTASm(F, mincta))
-    O << ".minnctapersm " << mincta << "\n";
+  unsigned Mincta = 0;
+  if (getMinCTASm(F, Mincta))
+    O << ".minnctapersm " << Mincta << "\n";
+
+  unsigned Maxnreg = 0;
+  if (getMaxNReg(F, Maxnreg))
+    O << ".maxnreg " << Maxnreg << "\n";
 
-  unsigned maxnreg;
-  if (getMaxNReg(F, maxnreg))
-    O << ".maxnreg " << maxnreg << "\n";
+  // .maxclusterrank directive requires SM_90 or higher, make sure that we
+  // filter it out for lower SM versions, as it causes a hard ptxas crash.
+  const NVPTXTargetMachine &NTM = static_cast<const NVPTXTargetMachine &>(TM);
+  const auto *STI = static_cast<const NVPTXSubtarget *>(NTM.getSubtargetImpl());
+  unsigned Maxclusterrank = 0;
+  if (getMaxClusterRank(F, Maxclusterrank) && STI->getSmVersion() >= 90)
+    O << ".maxclusterrank " << Maxclusterrank << "\n";
 }
 
-std::string
-NVPTXAsmPrinter::getVirtualRegisterName(unsigned Reg) const {
+std::string NVPTXAsmPrinter::getVirtualRegisterName(unsigned Reg) const {
   const TargetRegisterClass *RC = MRI->getRegClass(Reg);
 
   std::string Name;
diff --git a/llvm/lib/Target/NVPTX/NVPTXUtilities.cpp b/llvm/lib/Target/NVPTX/NVPTXUtilities.cpp
index c3737f9fcca82a6..35302889095f862 100644
--- a/llvm/lib/Target/NVPTX/NVPTXUtilities.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXUtilities.cpp
@@ -262,6 +262,10 @@ bool getMaxNTIDz(const Function &F, unsigned &z) {
   return findOneNVVMAnnotation(&F, "maxntidz", z);
 }
 
+bool getMaxClusterRank(const Function &F, unsigned &x) {
+  return findOneNVVMAnnotation(&F, "maxclusterrank", x);
+}
+
 bool getReqNTIDx(const Function &F, unsigned &x) {
   return findOneNVVMAnnotation(&F, "reqntidx", x);
 }
diff --git a/llvm/lib/Target/NVPTX/NVPTXUtilities.h b/llvm/lib/Target/NVPTX/NVPTXUtilities.h
index 521f8198911f29e..449973bb53de75c 100644
--- a/llvm/lib/Target/NVPTX/NVPTXUtilities.h
+++ b/llvm/lib/Target/NVPTX/NVPTXUtilities.h
@@ -55,6 +55,7 @@ bool getReqNTIDx(const Function &, unsigned &);
 bool getReqNTIDy(const Function &, unsigned &);
 bool getReqNTIDz(const Function &, unsigned &);
 
+bool getMaxClusterRank(const Function &, unsigned &);
 bool getMinCTASm(const Function &, unsigned &);
 bool getMaxNReg(const Function &, unsigned &);
 bool isKernelFunction(const Function &);
diff --git a/llvm/test/CodeGen/NVPTX/maxclusterrank.ll b/llvm/test/CodeGen/NVPTX/maxclusterrank.ll
new file mode 100644
index 000000000000000..828dd5e4cc400c6
--- /dev/null
+++ b/llvm/test/CodeGen/NVPTX/maxclusterrank.ll
@@ -0,0 +1,26 @@
+; RUN: llc < %s -march=nvptx64 -mcpu=sm_90 | FileCheck %s --check-prefixes=CHECK,CHECK_SM_90
+; RUN: llc < %s -march=nvptx64 -mcpu=sm_80 | FileCheck %s --check-prefixes=CHECK,CHECK_SM_80
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64"
+target triple = "nvptx64-unknown-unknown"
+
+; CHECK: .maxntid 128, 1, 1
+; CHECK: .minnctapersm 2
+; CHECK_SM_90: .maxclusterrank 8
+; CHECK_SM_80-NOT: .maxclusterrank 8
+
+; Make sure that for SM version prior to 90 `.maxclusterrank` directive is
+; sielently ignored.
+define dso_local void @_Z18TestMaxClusterRankv() {
+entry:
+  %a = alloca i32, align 4
+  store volatile i32 1, ptr %a, align 4
+  ret void
+}
+
+!nvvm.annotations = !{!0, !1, !2, !3}
+
+!0 = !{ptr @_Z18TestMaxClusterRankv, !"kernel", i32 1}
+!1 = !{ptr @_Z18TestMaxClusterRankv, !"maxntidx", i32 128}
+!2 = !{ptr @_Z18TestMaxClusterRankv, !"minctasm", i32 2}
+!3 = !{ptr @_Z18TestMaxClusterRankv, !"maxclusterrank", i32 8}



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