[LIR] Set attributes on memset_pattern16.

"inferattrs" will deduce the attribute, but it will be too late for
many optimizations. Set it ourselves when creating the call.

Differential Revision: http://reviews.llvm.org/D17598

llvm-svn: 267762

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp b/llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp
index c93f9438eea..67778398332 100644
--- a/llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp
@@ -53,6 +53,7 @@
 #include "llvm/IR/Module.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/Utils/BuildLibCalls.h"
 #include "llvm/Transforms/Utils/Local.h"
 #include "llvm/Transforms/Utils/LoopUtils.h"
 using namespace llvm;
@@ -769,6 +770,7 @@ bool LoopIdiomRecognize::processLoopStridedStore(
     Value *MSP =
         M->getOrInsertFunction("memset_pattern16", Builder.getVoidTy(),
                                Int8PtrTy, Int8PtrTy, IntPtr, (void *)nullptr);
+    inferLibFuncAttributes(*M->getFunction("memset_pattern16"), *TLI);
 
     // Otherwise we should form a memset_pattern16.  PatternValue is known to be
     // an constant array of 16-bytes.  Plop the value into a mergable global.