[CodeGen][ExpandMemcmp] Allow memcmp to expand to vector loads (2).

 - Targets that want to support memcmp expansions now return the list of
   supported load sizes.
 - Expansion codegen does not assume that all power-of-two load sizes
   smaller than the max load size are valid. For examples, this is not the
   case for x86(32bit)+sse2.

Fixes PR34887.

llvm-svn: 316905

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp
index c3185bf2bbd..53bedfe3f63 100644
--- a/llvm/lib/Analysis/TargetTransformInfo.cpp
+++ b/llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -250,8 +250,9 @@ bool TargetTransformInfo::enableAggressiveInterleaving(bool LoopHasReductions) c
   return TTIImpl->enableAggressiveInterleaving(LoopHasReductions);
 }
 
-bool TargetTransformInfo::enableMemCmpExpansion(unsigned &MaxLoadSize) const {
-  return TTIImpl->enableMemCmpExpansion(MaxLoadSize);
+const TargetTransformInfo::MemCmpExpansionOptions *
+TargetTransformInfo::enableMemCmpExpansion(bool IsZeroCmp) const {
+  return TTIImpl->enableMemCmpExpansion(IsZeroCmp);
 }
 
 bool TargetTransformInfo::enableInterleavedAccessVectorization() const {