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| author | Chris Lattner <sabre@nondot.org> | 2012-12-31 08:10:58 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2012-12-31 08:10:58 +0000 |
| commit | 240b9b1d80ae237805e8b5ec8280c139f7455b60 (patch) | |
| tree | 48a63368ef4769a7082cf21b1018c0e881b4822a /lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp | |
| parent | b6d9c4181a57a4b57d92a4437761387606f49c2d (diff) | |
| download | llvm-240b9b1d80ae237805e8b5ec8280c139f7455b60.tar.gz llvm-240b9b1d80ae237805e8b5ec8280c139f7455b60.tar.bz2 llvm-240b9b1d80ae237805e8b5ec8280c139f7455b60.tar.xz | |
teach instcombine to preserve TBAA tag when merging two stores, part of
PR14753
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171279 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp index 5726d3a91d..ca06957281 100644 --- a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp +++ b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp @@ -802,6 +802,13 @@ bool InstCombiner::SimplifyStoreAtEndOfBlock(StoreInst &SI) { InsertNewInstBefore(NewSI, *BBI); NewSI->setDebugLoc(OtherStore->getDebugLoc()); + // If the two stores had the same TBAA tag, preserve it. + if (MDNode *TBAATag1 = SI.getMetadata(LLVMContext::MD_tbaa)) + if (MDNode *TBAATag2 = OtherStore->getMetadata(LLVMContext::MD_tbaa)) + if (TBAATag1 == TBAATag2) + NewSI->setMetadata(LLVMContext::MD_tbaa, TBAATag1); + + // Nuke the old stores. EraseInstFromFunction(SI); EraseInstFromFunction(*OtherStore); |