1 files changed, 14 insertions, 1 deletions
diff --git a/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp b/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
index dee3d2856701..0d6689bd04c4 100644
--- a/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
+++ b/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
@@ -195,7 +195,7 @@ unsigned AMDGPUTTIImpl::getNumberOfRegisters(bool Vec) {
   return 4 * 128; // XXX - 4 channels. Should these count as vector instead?
 }
 
-unsigned AMDGPUTTIImpl::getRegisterBitWidth(bool Vector) {
+unsigned AMDGPUTTIImpl::getRegisterBitWidth(bool Vector) const {
   return Vector ? 0 : 32;
 }
 
@@ -489,6 +489,19 @@ bool AMDGPUTTIImpl::isSourceOfDivergence(const Value *V) const {
   return false;
 }
 
+bool AMDGPUTTIImpl::isAlwaysUniform(const Value *V) const {
+  if (const IntrinsicInst *Intrinsic = dyn_cast<IntrinsicInst>(V)) {
+    switch (Intrinsic->getIntrinsicID()) {
+    default:
+      return false;
+    case Intrinsic::amdgcn_readfirstlane:
+    case Intrinsic::amdgcn_readlane:
+      return true;
+    }
+  }
+  return false;
+}
+
 unsigned AMDGPUTTIImpl::getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index,
                                        Type *SubTp) {
   if (ST->hasVOP3PInsts()) {