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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 | eeefe1bc07ac7ce7f774220fc4f099b6ba24bacd (patch) | |
| tree | 3ffb5c9a08d3b30d3fe7a0b77e2a575a0a61cd89 /llvm/lib/Transforms/InstCombine | |
| parent | 82f61bf4b69e39b6f0b8ac82a8c9be953148b5e2 (diff) | |
| download | bcm5719-llvm-eeefe1bc07ac7ce7f774220fc4f099b6ba24bacd.tar.gz bcm5719-llvm-eeefe1bc07ac7ce7f774220fc4f099b6ba24bacd.zip | |
teach instcombine to preserve TBAA tag when merging two stores, part of
PR14753
llvm-svn: 171279
Diffstat (limited to 'llvm/lib/Transforms/InstCombine')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp b/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp index 5726d3a91de..ca069572812 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp +++ b/llvm/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); |
