[llvm] [LLVM][IR][Sanitizers] Add sanitize_numerical_stability attribute (PR #95051)

[Alexander Shaposhnikov via llvm-commits]

https://github.com/alexander-shaposhnikov created https://github.com/llvm/llvm-project/pull/95051

Split out the attribute-related changes from https://github.com/llvm/llvm-project/pull/85916.

Test plan: ninja check-all

>From 1b44cf8d735c3cac8b7eecfabcea35337343a4ed Mon Sep 17 00:00:00 2001
From: Alexander Shaposhnikov <ashaposhnikov at google.com>
Date: Mon, 10 Jun 2024 21:32:33 +0000
Subject: [PATCH] [LLVM][IR][Sanitizers] Add sanitize_numerical_stability
 attribute

---
 llvm/include/llvm/Bitcode/LLVMBitCodes.h    | 1 +
 llvm/include/llvm/IR/Attributes.td          | 4 ++++
 llvm/lib/Bitcode/Reader/BitcodeReader.cpp   | 2 ++
 llvm/lib/Bitcode/Writer/BitcodeWriter.cpp   | 2 ++
 llvm/lib/Transforms/Utils/CodeExtractor.cpp | 1 +
 llvm/test/Bitcode/compatibility.ll          | 7 +++++--
 6 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/llvm/include/llvm/Bitcode/LLVMBitCodes.h b/llvm/include/llvm/Bitcode/LLVMBitCodes.h
index 9999aee61528e..39dcd209afdc6 100644
--- a/llvm/include/llvm/Bitcode/LLVMBitCodes.h
+++ b/llvm/include/llvm/Bitcode/LLVMBitCodes.h
@@ -754,6 +754,7 @@ enum AttributeKindCodes {
   ATTR_KIND_CORO_ONLY_DESTROY_WHEN_COMPLETE = 90,
   ATTR_KIND_DEAD_ON_UNWIND = 91,
   ATTR_KIND_RANGE = 92,
+  ATTR_KIND_SANITIZE_NUMERICAL_STABILITY = 93,
 };
 
 enum ComdatSelectionKindCodes {
diff --git a/llvm/include/llvm/IR/Attributes.td b/llvm/include/llvm/IR/Attributes.td
index cef8b17769f0d..772c7579aec6d 100644
--- a/llvm/include/llvm/IR/Attributes.td
+++ b/llvm/include/llvm/IR/Attributes.td
@@ -285,6 +285,9 @@ def SanitizeHWAddress : EnumAttr<"sanitize_hwaddress", [FnAttr]>;
 /// MemTagSanitizer is on.
 def SanitizeMemTag : EnumAttr<"sanitize_memtag", [FnAttr]>;
 
+/// NumericalStabilitySanitizer is on.
+def SanitizeNumericalStability : EnumAttr<"sanitize_numerical_stability", [FnAttr]>;
+
 /// Speculative Load Hardening is enabled.
 ///
 /// Note that this uses the default compatibility (always compatible during
@@ -372,6 +375,7 @@ def : CompatRule<"isEqual<SanitizeThreadAttr>">;
 def : CompatRule<"isEqual<SanitizeMemoryAttr>">;
 def : CompatRule<"isEqual<SanitizeHWAddressAttr>">;
 def : CompatRule<"isEqual<SanitizeMemTagAttr>">;
+def : CompatRule<"isEqual<SanitizeNumericalStabilityAttr>">;
 def : CompatRule<"isEqual<SafeStackAttr>">;
 def : CompatRule<"isEqual<ShadowCallStackAttr>">;
 def : CompatRule<"isEqual<UseSampleProfileAttr>">;
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 8519796deeb1a..c667913005cd8 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -2128,6 +2128,8 @@ static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
     return Attribute::SanitizeThread;
   case bitc::ATTR_KIND_SANITIZE_MEMORY:
     return Attribute::SanitizeMemory;
+  case bitc::ATTR_KIND_SANITIZE_NUMERICAL_STABILITY:
+    return Attribute::SanitizeNumericalStability;
   case bitc::ATTR_KIND_SPECULATIVE_LOAD_HARDENING:
     return Attribute::SpeculativeLoadHardening;
   case bitc::ATTR_KIND_SWIFT_ERROR:
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 35ea3c11396e7..b08d5c50e5ae3 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -828,6 +828,8 @@ static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
     return bitc::ATTR_KIND_SANITIZE_THREAD;
   case Attribute::SanitizeMemory:
     return bitc::ATTR_KIND_SANITIZE_MEMORY;
+  case Attribute::SanitizeNumericalStability:
+    return bitc::ATTR_KIND_SANITIZE_NUMERICAL_STABILITY;
   case Attribute::SpeculativeLoadHardening:
     return bitc::ATTR_KIND_SPECULATIVE_LOAD_HARDENING;
   case Attribute::SwiftError:
diff --git a/llvm/lib/Transforms/Utils/CodeExtractor.cpp b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
index f2672b8e9118f..b2775eb6c6c7a 100644
--- a/llvm/lib/Transforms/Utils/CodeExtractor.cpp
+++ b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
@@ -954,6 +954,7 @@ Function *CodeExtractor::constructFunction(const ValueSet &inputs,
       case Attribute::ShadowCallStack:
       case Attribute::SanitizeAddress:
       case Attribute::SanitizeMemory:
+      case Attribute::SanitizeNumericalStability:
       case Attribute::SanitizeThread:
       case Attribute::SanitizeHWAddress:
       case Attribute::SanitizeMemTag:
diff --git a/llvm/test/Bitcode/compatibility.ll b/llvm/test/Bitcode/compatibility.ll
index 2a846e036924c..e437c37d8d1c8 100644
--- a/llvm/test/Bitcode/compatibility.ll
+++ b/llvm/test/Bitcode/compatibility.ll
@@ -1564,7 +1564,7 @@ exit:
   ; CHECK: select <2 x i1> <i1 true, i1 false>, <2 x i8> <i8 2, i8 3>, <2 x i8> <i8 3, i8 2>
 
   call void @f.nobuiltin() builtin
-  ; CHECK: call void @f.nobuiltin() #51
+  ; CHECK: call void @f.nobuiltin() #52
 
   call fastcc noalias ptr @f.noalias() noinline
   ; CHECK: call fastcc noalias ptr @f.noalias() #12
@@ -1988,6 +1988,8 @@ declare void @f.nosanitize_bounds() nosanitize_bounds
 declare void @f.allockind() allockind("alloc,uninitialized")
 ; CHECK: declare void @f.allockind() #50
 
+declare void @f.sanitize_numerical_stability() sanitize_numerical_stability
+; CHECK: declare void @f.sanitize_numerical_stability() #51
 
 ; CHECK: declare nofpclass(snan) float @nofpclass_snan(float nofpclass(snan))
 declare nofpclass(snan) float @nofpclass_snan(float nofpclass(snan))
@@ -2110,7 +2112,8 @@ define float @nofpclass_callsites(float %arg) {
 ; CHECK: attributes #48 = { allocsize(1,0) }
 ; CHECK: attributes #49 = { nosanitize_bounds }
 ; CHECK: attributes #50 = { allockind("alloc,uninitialized") }
-; CHECK: attributes #51 = { builtin }
+; CHECK: attributes #51 = { sanitize_numerical_stability }
+; CHECK: attributes #52 = { builtin }
 
 ;; Metadata