[clang] clang/AMDGPU: Stop emitting amdgpu-unsafe-fp-atomics attribute (PR #111579)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Matt Arsenault (arsenm)

<details>
<summary>Changes</summary>

This has been replaced with metadata on individual atomicrmw instructions.

---
Full diff: https://github.com/llvm/llvm-project/pull/111579.diff


3 Files Affected:

- (modified) clang/lib/CodeGen/Targets/AMDGPU.cpp (-3) 
- (removed) clang/test/CodeGenCUDA/amdgpu-func-attrs.cu (-22) 
- (modified) clang/test/OpenMP/amdgcn-attributes.cpp (-3) 


``````````diff
diff --git a/clang/lib/CodeGen/Targets/AMDGPU.cpp b/clang/lib/CodeGen/Targets/AMDGPU.cpp
index 37e6af3d4196a8..b852dcffb295c9 100644
--- a/clang/lib/CodeGen/Targets/AMDGPU.cpp
+++ b/clang/lib/CodeGen/Targets/AMDGPU.cpp
@@ -452,9 +452,6 @@ void AMDGPUTargetCodeGenInfo::setTargetAttributes(
   if (FD)
     setFunctionDeclAttributes(FD, F, M);
 
-  if (M.getContext().getTargetInfo().allowAMDGPUUnsafeFPAtomics())
-    F->addFnAttr("amdgpu-unsafe-fp-atomics", "true");
-
   if (!getABIInfo().getCodeGenOpts().EmitIEEENaNCompliantInsts)
     F->addFnAttr("amdgpu-ieee", "false");
 }
diff --git a/clang/test/CodeGenCUDA/amdgpu-func-attrs.cu b/clang/test/CodeGenCUDA/amdgpu-func-attrs.cu
deleted file mode 100644
index 89add87919c12d..00000000000000
--- a/clang/test/CodeGenCUDA/amdgpu-func-attrs.cu
+++ /dev/null
@@ -1,22 +0,0 @@
-// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa \
-// RUN:     -fcuda-is-device -emit-llvm -o - -x hip %s \
-// RUN:     | FileCheck -check-prefixes=NO-UNSAFE-FP-ATOMICS %s
-// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa \
-// RUN:     -fcuda-is-device -emit-llvm -o - -x hip %s \
-// RUN:     -munsafe-fp-atomics \
-// RUN:     | FileCheck -check-prefixes=UNSAFE-FP-ATOMICS %s
-// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm \
-// RUN:     -o - -x hip %s -munsafe-fp-atomics \
-// RUN:     | FileCheck -check-prefix=NO-UNSAFE-FP-ATOMICS %s
-
-#include "Inputs/cuda.h"
-
-__device__ void test() {
-// UNSAFE-FP-ATOMICS: define{{.*}} void @_Z4testv() [[ATTR:#[0-9]+]]
-}
-
-
-// Make sure this is silently accepted on other targets.
-// NO-UNSAFE-FP-ATOMICS-NOT: "amdgpu-unsafe-fp-atomics"
-
-// UNSAFE-FP-ATOMICS-DAG: attributes [[ATTR]] = {{.*}}"amdgpu-unsafe-fp-atomics"="true"
diff --git a/clang/test/OpenMP/amdgcn-attributes.cpp b/clang/test/OpenMP/amdgcn-attributes.cpp
index 5ddc34537d12fb..2c9e16a4f5098e 100644
--- a/clang/test/OpenMP/amdgcn-attributes.cpp
+++ b/clang/test/OpenMP/amdgcn-attributes.cpp
@@ -5,7 +5,6 @@
 // RUN: %clang_cc1 -target-cpu gfx900 -fopenmp -x c++ -std=c++11 -triple amdgcn-amd-amdhsa -fopenmp-targets=amdgcn-amd-amdhsa -emit-llvm %s -fopenmp-is-target-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck -check-prefixes=CPU,ALL %s
 
 // RUN: %clang_cc1 -menable-no-nans -mno-amdgpu-ieee -fopenmp -x c++ -std=c++11 -triple amdgcn-amd-amdhsa -fopenmp-targets=amdgcn-amd-amdhsa -emit-llvm %s -fopenmp-is-target-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck -check-prefixes=NOIEEE,ALL %s
-// RUN: %clang_cc1 -munsafe-fp-atomics -fopenmp -x c++ -std=c++11 -triple amdgcn-amd-amdhsa -fopenmp-targets=amdgcn-amd-amdhsa -emit-llvm %s -fopenmp-is-target-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck -check-prefixes=UNSAFEATOMIC,ALL %s
 
 // expected-no-diagnostics
 
@@ -35,9 +34,7 @@ int callable(int x) {
 // DEFAULT: attributes #0 = { convergent mustprogress noinline norecurse nounwind optnone "amdgpu-flat-work-group-size"="1,42" "kernel" "no-trapping-math"="true" "omp_target_thread_limit"="42" "stack-protector-buffer-size"="8" "uniform-work-group-size"="true" }
 // CPU: attributes #0 = { convergent mustprogress noinline norecurse nounwind optnone "amdgpu-flat-work-group-size"="1,42" "kernel" "no-trapping-math"="true" "omp_target_thread_limit"="42" "stack-protector-buffer-size"="8" "target-cpu"="gfx900" "target-features"="+16-bit-insts,+ci-insts,+dpp,+gfx8-insts,+gfx9-insts,+s-memrealtime,+s-memtime-inst,+wavefrontsize64" "uniform-work-group-size"="true" }
 // NOIEEE: attributes #0 = { convergent mustprogress noinline norecurse nounwind optnone "amdgpu-flat-work-group-size"="1,42" "amdgpu-ieee"="false" "kernel" "no-nans-fp-math"="true" "no-trapping-math"="true" "omp_target_thread_limit"="42" "stack-protector-buffer-size"="8" "uniform-work-group-size"="true" }
-// UNSAFEATOMIC: attributes #0 = { convergent mustprogress noinline norecurse nounwind optnone "amdgpu-flat-work-group-size"="1,42" "amdgpu-unsafe-fp-atomics"="true" "kernel" "no-trapping-math"="true" "omp_target_thread_limit"="42" "stack-protector-buffer-size"="8" "uniform-work-group-size"="true" }
 
 // DEFAULT: attributes #2 = { convergent mustprogress noinline nounwind optnone "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
 // CPU: attributes #2 = { convergent mustprogress noinline nounwind optnone "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="gfx900" "target-features"="+16-bit-insts,+ci-insts,+dpp,+gfx8-insts,+gfx9-insts,+s-memrealtime,+s-memtime-inst,+wavefrontsize64" }
 // NOIEEE: attributes #2 = { convergent mustprogress noinline nounwind optnone "amdgpu-ieee"="false" "no-nans-fp-math"="true" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
-// UNSAFEATOMIC: attributes #2 = { convergent mustprogress noinline nounwind optnone "amdgpu-unsafe-fp-atomics"="true" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }

``````````

</details>


https://github.com/llvm/llvm-project/pull/111579