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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-10-27 15:18:28 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-10-27 15:18:28 +0000 |
| commit | badffcf8fddf3978acf9843a43e66766e9e830c6 (patch) | |
| tree | 14095ac554d0100cdb8f797d6d44b409b8641c37 /lib | |
| parent | d11c5d08a5f4f030d6e357378d0d46d93efd9a59 (diff) | |
| download | llvm-badffcf8fddf3978acf9843a43e66766e9e830c6.tar.gz llvm-badffcf8fddf3978acf9843a43e66766e9e830c6.tar.bz2 llvm-badffcf8fddf3978acf9843a43e66766e9e830c6.tar.xz | |
LoopIdiom: Add checks to avoid turning memmove into an infinite loop.
I don't think this is possible with the current implementation but that may change eventually.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166877 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/LoopIdiomRecognize.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/LoopIdiomRecognize.cpp b/lib/Transforms/Scalar/LoopIdiomRecognize.cpp index 495d403e54..bc8ae66036 100644 --- a/lib/Transforms/Scalar/LoopIdiomRecognize.cpp +++ b/lib/Transforms/Scalar/LoopIdiomRecognize.cpp @@ -178,7 +178,7 @@ bool LoopIdiomRecognize::runOnLoop(Loop *L, LPPassManager &LPM) { // Disable loop idiom recognition if the function's name is a common idiom. StringRef Name = L->getHeader()->getParent()->getName(); - if (Name == "memset" || Name == "memcpy") + if (Name == "memset" || Name == "memcpy" || Name == "memmove") return false; // The trip count of the loop must be analyzable. @@ -524,7 +524,7 @@ processLoopStoreOfLoopLoad(StoreInst *SI, unsigned StoreSize, const SCEVAddRecExpr *LoadEv, const SCEV *BECount) { // If we're not allowed to form memcpy, we fail. - if (!TLI->has(LibFunc::memcpy)) + if (!TLI->has(LibFunc::memcpy) || !TLI->has(LibFunc::memmove)) return false; LoadInst *LI = cast<LoadInst>(SI->getValueOperand()); |