[AMDGPU] Add s-memrealtime and s-memtime-inst to RemoveIncompatibleFunctions

[cfang]

Summary

Under -O0, device-libs may still emit these instructions under conditions.
So we need to remove them with warning if not compatible.

Fixes: SWDEV-417219

[Pierre-vh]

LGTM but maybe wait for @arsenm or @b-sumner to comment just in case

[b-sumner]

I am fine with this.

llvm/lib/Target/AMDGPU/AMDGPURemoveIncompatibleFunctions.cpp

constexpr unsigned FeaturesToCheck[] = {
     AMDGPU::FeatureDot2Insts,
     AMDGPU::FeatureDot3Insts,
     AMDGPU::FeatureDot4Insts,
     AMDGPU::FeatureDot5Insts,
     AMDGPU::FeatureDot6Insts,
     AMDGPU::FeatureDot7Insts,
     AMDGPU::FeatureDot8Insts,
     AMDGPU::FeatureExtendedImageInsts,
+    AMDGPU::FeatureSMemRealTime,
+    AMDGPU::FeatureSMemTimeInst
 };
 
 FeatureBitset expandImpliedFeatures(const FeatureBitset &Features) {
   FeatureBitset Result = Features;
   for (const SubtargetFeatureKV &FE : AMDGPUFeatureKV) {
     if (Features.test(FE.Value) && FE.Implies.any())
       Result |= expandImpliedFeatures(FE.Implies.getAsBitset());
   }

llvm/test/CodeGen/AMDGPU/remove-incompatible-s-time.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -march=amdgcn -mcpu=gfx1030 -stop-after=amdgpu-remove-incompatible-functions\
+; RUN:   -pass-remarks=amdgpu-remove-incompatible-functions %s -o - 2>%t | FileCheck -check-prefixes=COMPATIBLE,REALTIME,MEMTIME %s
+; RUN: FileCheck -allow-empty --check-prefixes=WARN-REALTIME,WARN-MEMTIME %s < %t
+; RUN: llc -march=amdgcn -mcpu=gfx1030 -verify-machineinstrs < %s
+
+; RUN: llc -march=amdgcn -mcpu=gfx1102 -stop-after=amdgpu-remove-incompatible-functions\
+; RUN:   -pass-remarks=amdgpu-remove-incompatible-functions %s -o - 2>%t | FileCheck -check-prefixes=INCOMPATIBLE,NOREALTIME,NOMEMTIME %s
+; RUN: FileCheck --check-prefixes=WARN-NOREALTIME,WARN-NOMEMTIME %s < %t
+; RUN: llc -march=amdgcn -mcpu=gfx1102 -verify-machineinstrs < %s
+
+; Note: This test checks the IR, but also has a run line to codegen the file just to check we
+; do not crash when trying to select those functions.
+
+; WARN-REALTIME-NOT: removing function 'needs_s_memrealtime':
+; WARN-MEMTIME-NOT:  removing function 'needs_s_memtime':
+; WARN-NOREALTIME:   removing function 'needs_s_memrealtime': +s-memrealtime is not supported on the current target
+; WARN-NOMEMTIME:    removing function 'needs_s_memtime': +s-memtime-inst is not supported on the current target
+
+; COMPATIBLE:       @GVRefs  {{.*}} [ptr @needs_s_memrealtime, ptr @needs_s_memtime]
+; INCOMPATIBLE:     @GVRefs {{.*}} zeroinitializer
+@GVRefs = internal global [2 x ptr] [
+  ptr @needs_s_memrealtime,
+  ptr @needs_s_memtime
+]
+
+; REALTIME:    @ConstantExpr0 = internal global i64 ptrtoint (ptr @needs_s_memrealtime to i64)
+; NOREALTIME:  @ConstantExpr0 = internal global i64 0
+@ConstantExpr0 = internal global i64 ptrtoint (ptr @needs_s_memrealtime to i64)
+
+; MEMTIME:     @ConstantExpr1 = internal global i64 ptrtoint (ptr @needs_s_memtime to i64)
+; NOMEMTIME:   @ConstantExpr1 = internal global i64 0
+@ConstantExpr1 = internal global i64 ptrtoint (ptr @needs_s_memtime to i64)
+
+; REALTIME:         define i64 @needs_s_memrealtime
+; NOREALTIME-NOT:   define i64 @needs_s_memrealtime
+define i64 @needs_s_memrealtime() #0 {
+  %t = tail call i64 @llvm.amdgcn.s.memrealtime()
+  ret i64 %t
+}
+
+; IR: define void @s_memrealtime_caller(
+define i64 @s_memrealtime_caller() {
+  ; REALTIME: call i64 @needs_s_memrealtime(
+  ; NOREALTIME: call i64 null
+  %t = call i64 @needs_s_memrealtime()
+  ; IR: ret i64 %t
+  ret i64 %t
+}
+
+; MEMTIME:         define i64 @needs_s_memtime
+; NOMEMTIME-NOT:   define i64 @needs_s_memtime
+define i64 @needs_s_memtime() #1 {
+  %t = tail call i64 @llvm.amdgcn.s.memtime()
+  ret i64 %t
+}
+
+; IR: define void @s_memtime_caller(
+define i64 @s_memtime_caller() {
+  ; MEMTIME: call i64 @needs_s_memtime(
+  ; NOMEMTIME: call i64 null
+  %t = call i64 @needs_s_memtime()
+  ; IR: ret i64 %t
+  ret i64 %t
+}
+
+
+declare i64 @llvm.amdgcn.s.memrealtime()
+declare i64 @llvm.amdgcn.s.memtime()
+
+attributes #0 = { "target-features"="+s-memrealtime"}
+attributes #1 = { "target-features"="+s-memtime-inst"}