[AMDGPU] Allow readonly features to be written to IR when there is no target (llvm#148141) (llvm#3364)

Author: vamovsik

clang/lib/Basic/Targets/AMDGPU.cpp

@@ -253,8 +253,11 @@ AMDGPUTargetInfo::AMDGPUTargetInfo(const llvm::Triple &Triple,
 
   MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
   CUMode = !(GPUFeatures & llvm::AMDGPU::FEATURE_WGP);
-  for (auto F : {"image-insts", "gws", "vmem-to-lds-load-insts"})
-    ReadOnlyFeatures.insert(F);
+
+  for (auto F : {"image-insts", "gws", "vmem-to-lds-load-insts"}) {
+    if (GPUKind != llvm::AMDGPU::GK_NONE)
+      ReadOnlyFeatures.insert(F);
+  }
   HalfArgsAndReturns = true;
 }
 

clang/test/CodeGenOpenCL/amdgpu-features-readonly.cl

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple amdgcn -target-feature +gws -o /dev/null %s 2>&1 \
+// RUN: %clang_cc1 -triple amdgcn -target-cpu gfx942 -target-feature +gws -o /dev/null %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=GWS %s
 
 // GWS: warning: feature flag '+gws' is ignored since the feature is read only [-Winvalid-command-line-argument]

clang/test/CodeGenOpenCL/amdgpu-readonly-features-written-with-no-target.cl

@@ -0,0 +1,16 @@
+// REQUIRES: amdgpu-registered-target
+
+// Check the readonly feature will can be written to the IR
+// if there is no target specified.
+
+// RUN: %clang_cc1 -triple amdgcn -emit-llvm -o - %s | FileCheck --check-prefix=NOCPU %s
+// RUN: %clang_cc1 -triple amdgcn -target-cpu gfx942 -emit-llvm -o - %s | FileCheck --check-prefix=GFX942 %s
+// RUN: %clang_cc1 -triple amdgcn -target-cpu gfx1100 -emit-llvm -o - %s | FileCheck --check-prefix=GFX1100 %s
+// RUN: %clang_cc1 -triple amdgcn -target-cpu gfx1200 -emit-llvm -o - %s | FileCheck --check-prefix=GFX1200 %s
+
+__attribute__((target("gws,image-insts,vmem-to-lds-load-insts"))) void test() {}
+
+// NOCPU: "target-features"="+gws,+image-insts,+vmem-to-lds-load-insts"
+// GFX942: "target-features"="+16-bit-insts,+atomic-buffer-global-pk-add-f16-insts,+atomic-ds-pk-add-16-insts,+atomic-fadd-rtn-insts,+atomic-flat-pk-add-16-insts,+atomic-global-pk-add-bf16-inst,+ci-insts,+dl-insts,+dot1-insts,+dot10-insts,+dot2-insts,+dot3-insts,+dot4-insts,+dot5-insts,+dot6-insts,+dot7-insts,+dpp,+fp8-conversion-insts,+fp8-insts,+gfx8-insts,+gfx9-insts,+gfx90a-insts,+gfx940-insts,+mai-insts,+s-memrealtime,+s-memtime-inst,+wavefrontsize64,+xf32-insts"
+// GFX1100: "target-features"="+16-bit-insts,+atomic-fadd-rtn-insts,+ci-insts,+dl-insts,+dot10-insts,+dot12-insts,+dot5-insts,+dot7-insts,+dot8-insts,+dot9-insts,+dpp,+gfx10-3-insts,+gfx10-insts,+gfx11-insts,+gfx8-insts,+gfx9-insts,+wavefrontsize32"
+// GFX1200: "target-features"="+16-bit-insts,+atomic-buffer-global-pk-add-f16-insts,+atomic-buffer-pk-add-bf16-inst,+atomic-ds-pk-add-16-insts,+atomic-fadd-rtn-insts,+atomic-flat-pk-add-16-insts,+atomic-global-pk-add-bf16-inst,+ci-insts,+dl-insts,+dot10-insts,+dot11-insts,+dot12-insts,+dot7-insts,+dot8-insts,+dot9-insts,+dpp,+fp8-conversion-insts,+gfx10-3-insts,+gfx10-insts,+gfx11-insts,+gfx12-insts,+gfx8-insts,+gfx9-insts,+wavefrontsize32"

llvm/lib/Target/AMDGPU/GCNProcessors.td

@@ -9,11 +9,11 @@
 // The code produced for "generic" is only useful for tests and cannot
 // reasonably be expected to execute on any particular target.
 def : ProcessorModel<"generic", NoSchedModel,
-  [FeatureGDS, FeatureGWS]
+  [FeatureGDS]
 >;
 
 def : ProcessorModel<"generic-hsa", NoSchedModel,
-  [FeatureGDS, FeatureGWS, FeatureFlatAddressSpace]
+  [FeatureGDS, FeatureFlatAddressSpace]
 >;
 
 //===------------------------------------------------------------===//