[PATCH] D31482: [AMDGPU][GFX9] Set +fp32-denormals for >=gfx900 unless -cl-denorms-are-zero is set

[Konstantin Zhuravlyov via Phabricator via cfe-commits]

kzhuravl created this revision.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, wdng.

https://reviews.llvm.org/D31482

Files:
  llvm/tools/clang/lib/Basic/Targets.cpp
  llvm/tools/clang/test/CodeGenOpenCL/gfx9-fp32-denorms.cl


Index: llvm/tools/clang/test/CodeGenOpenCL/gfx9-fp32-denorms.cl
===================================================================
--- llvm/tools/clang/test/CodeGenOpenCL/gfx9-fp32-denorms.cl
+++ llvm/tools/clang/test/CodeGenOpenCL/gfx9-fp32-denorms.cl
@@ -0,0 +1,13 @@
+// REQUIRES: amdgpu-registered-target
+
+// RUN: %clang_cc1 -triple amdgcn-unknown-unknown -target-cpu gfx900 -S -emit-llvm -o - %s | FileCheck --check-prefix=DEFAULT %s
+// RUN: %clang_cc1 -triple amdgcn-unknown-unknown -target-cpu gfx900 -S -emit-llvm -o - -target-feature +fp32-denormals %s | FileCheck --check-prefix=FEATURE_FP32_DENORMALS_ON %s
+// RUN: %clang_cc1 -triple amdgcn-unknown-unknown -target-cpu gfx900 -S -emit-llvm -o - -target-feature -fp32-denormals %s | FileCheck --check-prefix=FEATURE_FP32_DENORMALS_OFF %s
+// RUN: %clang_cc1 -triple amdgcn-unknown-unknown -target-cpu gfx900 -S -emit-llvm -o - -cl-denorms-are-zero %s | FileCheck --check-prefix=OPT_DENORMS_ARE_ZERO %s
+
+// DEFAULT: +fp32-denormals
+// FEATURE_FP32_DENORMALS_ON: +fp32-denormals
+// FEATURE_FP32_DENORMALS_OFF: -fp32-denormals
+// OPT_DENORMS_ARE_ZERO: -fp32-denormals
+
+kernel void gfx9_fp32_denorms() {}
Index: llvm/tools/clang/lib/Basic/Targets.cpp
===================================================================
--- llvm/tools/clang/lib/Basic/Targets.cpp
+++ llvm/tools/clang/lib/Basic/Targets.cpp
@@ -2109,9 +2109,12 @@
   bool hasFP64:1;
   bool hasFMAF:1;
   bool hasLDEXPF:1;
-  bool hasFullSpeedFP32Denorms:1;
   const AddrSpace AS;
 
+  static bool hasFullSpeedFP32Denorms(StringRef GPUName) {
+    return parseAMDGCNName(GPUName) >= GK_GFX9;
+  }
+
   static bool isAMDGCN(const llvm::Triple &TT) {
     return TT.getArch() == llvm::Triple::amdgcn;
   }
@@ -2127,7 +2130,6 @@
       hasFP64(false),
       hasFMAF(false),
       hasLDEXPF(false),
-      hasFullSpeedFP32Denorms(false),
       AS(isGenericZero(Triple)){
     if (getTriple().getArch() == llvm::Triple::amdgcn) {
       hasFP64 = true;
@@ -2196,7 +2198,8 @@
         hasFP64Denormals = true;
     }
     if (!hasFP32Denormals)
-      TargetOpts.Features.push_back((Twine(hasFullSpeedFP32Denorms &&
+      TargetOpts.Features.push_back(
+          (Twine(hasFullSpeedFP32Denorms(TargetOpts.CPU) &&
           !CGOpts.FlushDenorm ? '+' : '-') + Twine("fp32-denormals")).str());
     // Always do not flush fp64 or fp16 denorms.
     if (!hasFP64Denormals && hasFP64)


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