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SimplifyLibCalls: Add basic optimization of memchr calls.

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This is just memchr(x, y, 0) -> nullptr and constant folding.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232896 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2015-03-21 15:36:21 +00:00
parent 046c58a3ee
commit 4b74df7229
4 changed files with 168 additions and 3 deletions
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include/llvm/Transforms/Utils/SimplifyLibCalls.h
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@@ -116,6 +116,7 @@ private:
Value *optimizeStrSpn(CallInst *CI, IRBuilder<> &B);
Value *optimizeStrCSpn(CallInst *CI, IRBuilder<> &B);
Value *optimizeStrStr(CallInst *CI, IRBuilder<> &B);
Value *optimizeMemChr(CallInst *CI, IRBuilder<> &B);
Value *optimizeMemCmp(CallInst *CI, IRBuilder<> &B);
Value *optimizeMemCpy(CallInst *CI, IRBuilder<> &B);
Value *optimizeMemMove(CallInst *CI, IRBuilder<> &B);