2 files changed, 13 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
index 6dacc742b12..4afcc60984f 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
@@ -80,3 +80,14 @@ unsigned AMDGPUTTIImpl::getMaxInterleaveFactor(unsigned VF) {
   // Semi-arbitrary large amount.
   return 64;
 }
+
+int AMDGPUTTIImpl::getVectorInstrCost(unsigned Opcode, Type *ValTy,
+                                      unsigned Index) {
+  switch (Opcode) {
+  case Instruction::ExtractElement:
+    // Dynamic indexing isn't free and is best avoided.
+    return Index == ~0u ? 2 : 0;
+  default:
+    return BaseT::getVectorInstrCost(Opcode, ValTy, Index);
+  }
+}
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
index dee0a69d1e6..5a94a0ba470 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
@@ -60,6 +60,8 @@ public:
   unsigned getNumberOfRegisters(bool Vector);
   unsigned getRegisterBitWidth(bool Vector);
   unsigned getMaxInterleaveFactor(unsigned VF);
+
+  int getVectorInstrCost(unsigned Opcode, Type *ValTy, unsigned Index);
 };
 
 } // end namespace llvm