Inliner: Correctly merge amdgpu-unsafe-fp-atomics attribute

[arsenm]

Summary

It seems we don't have already have any target specific attributes
handled in the inliner. Include a separate tablegen file to define the
rules, similar to the target specific intrinsics.

[jdoerfert]

LG

[arsenm]

169ebf03ab2a6f16bfa32a36305929c7bc8e4784

llvm/include/llvm/IR/Attributes.td

 def : MergeRule<"setOR<ProfileSampleAccurateAttr>">;
 def : MergeRule<"setOR<SpeculativeLoadHardeningAttr>">;
 def : MergeRule<"adjustCallerSSPLevel">;
 def : MergeRule<"adjustCallerStackProbes">;
 def : MergeRule<"adjustCallerStackProbeSize">;
 def : MergeRule<"adjustMinLegalVectorWidth">;
 def : MergeRule<"adjustNullPointerValidAttr">;
 def : MergeRule<"setAND<MustProgressAttr>">;
+
+// Target dependent attributes
+include "llvm/IR/AttributesAMDGPU.td"

llvm/include/llvm/IR/AttributesAMDGPU.td

+//===- AttributesAMDGPU.td - Defines AMDGPU attributes -----*- tablegen -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines AMDGPU specific attributes.
+//
+//===----------------------------------------------------------------------===//
+
+def AMDGPUUnsafeFPAtomics : StrBoolAttr<"amdgpu-unsafe-fp-atomics">;
+def : MergeRule<"setAND<AMDGPUUnsafeFPAtomicsAttr>">;

llvm/test/Transforms/Inline/AMDGPU/inline-amdgpu-unsafe-fp-atomics.ll

 ; CHECK-NEXT:    ret i32 0
 ;
   %call = call i32 @func_default()
   ret i32 %call
 }
 
 define i32 @unsafe_fp_atomic_enabled_call_default() #1 {
 ; CHECK-LABEL: define {{[^@]+}}@unsafe_fp_atomic_enabled_call_default
-; CHECK-SAME: () #[[ATTR1]] {
+; CHECK-SAME: () #[[ATTR2]] {
 ; CHECK-NEXT:    ret i32 0
 ;
   %call = call i32 @func_default()
   ret i32 %call
 }
 
 define i32 @unsafe_fp_atomic_enabled_call_unsafe_fp_atomic_enabled() #1 {
 ; CHECK-LABEL: define {{[^@]+}}@unsafe_fp_atomic_enabled_call_unsafe_fp_atomic_enabled
 ; CHECK-SAME: () #[[ATTR1]] {
 ; CHECK-NEXT:    ret i32 0
 ;
   %call = call i32 @func_unsafe_fp_atomic_enabled()
   ret i32 %call
 }
 
 define i32 @unsafe_fp_atomic_enabled_call_unsafe_fp_atomic_disabled() #1 {
 ; CHECK-LABEL: define {{[^@]+}}@unsafe_fp_atomic_enabled_call_unsafe_fp_atomic_disabled
-; CHECK-SAME: () #[[ATTR1]] {
+; CHECK-SAME: () #[[ATTR2]] {
 ; CHECK-NEXT:    ret i32 0
 ;
   %call = call i32 @func_unsafe_fp_atomic_disabled()
   ret i32 %call
 }
 
 define i32 @unsafe_fp_atomic_disabled_call_default() #2 {
 ; CHECK-LABEL: define {{[^@]+}}@unsafe_fp_atomic_disabled_call_default