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[LIR] Set attributes on memset_pattern16.

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"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
This commit is contained in:
Ahmed Bougacha 2016-04-27 19:04:50 +00:00
parent 837b4a5338
commit 591dc29993
2 changed files with 6 additions and 0 deletions
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2
lib/Transforms/Scalar/LoopIdiomRecognize.cpp
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@ -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.

4
test/Transforms/LoopIdiom/basic.ll
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@ -564,3 +564,7 @@ for.end6: ; preds = %for.inc4
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* %X, i8 0, i64 10000, i32 1, i1 false)
; CHECK: ret void
}
; Validate that "memset_pattern" has the proper attributes.
; CHECK: declare void @memset_pattern16(i8* nocapture, i8* nocapture readonly, i64) [[ATTRS:#[0-9]+]]
; CHECK: [[ATTRS]] = { argmemonly }