AMDGPU: Override getCFInstrCost

The default cost was 0 with the assumption that it is predictable.

llvm-svn: 255796

2 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
index c7ea412ce22..eb9e837d291 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
@@ -81,6 +81,17 @@ unsigned AMDGPUTTIImpl::getMaxInterleaveFactor(unsigned VF) {
   return 64;
 }
 
+unsigned AMDGPUTTIImpl::getCFInstrCost(unsigned Opcode) {
+  // XXX - For some reason this isn't called for switch.
+  switch (Opcode) {
+  case Instruction::Br:
+  case Instruction::Ret:
+    return 10;
+  default:
+    return BaseT::getCFInstrCost(Opcode);
+  }
+}
+
 int AMDGPUTTIImpl::getVectorInstrCost(unsigned Opcode, Type *ValTy,
                                       unsigned Index) {
   switch (Opcode) {
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
index 2a9727141b3..976afb03443 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
@@ -61,6 +61,8 @@ public:
   unsigned getRegisterBitWidth(bool Vector);
   unsigned getMaxInterleaveFactor(unsigned VF);
 
+  unsigned getCFInstrCost(unsigned Opcode);
+
   int getVectorInstrCost(unsigned Opcode, Type *ValTy, unsigned Index);
   bool isSourceOfDivergence(const Value *V) const;
 };