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Preserving 'nonnull' metadata in SimplifyCFG

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When we hoist two loads above an if, we can preserve the nonnull metadata.  We could also do the same for sinking them, but we appear to not handle metadata at all in that case.

Thanks to Hal for the review.

Differential Revision: http://reviews.llvm.org/D5910



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220392 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Philip Reames 2014-10-22 16:37:13 +00:00
parent dc18ebc4b1
commit 1b8af6a8f0
1 changed files with 4 additions and 1 deletions
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5
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -1061,7 +1061,8 @@ static bool HoistThenElseCodeToIf(BranchInst *BI, const DataLayout *DL) {
LLVMContext::MD_tbaa,
LLVMContext::MD_range,
LLVMContext::MD_fpmath,
LLVMContext::MD_invariant_load
LLVMContext::MD_invariant_load,
LLVMContext::MD_nonnull
};
combineMetadata(I1, I2, KnownIDs);
I2->eraseFromParent();
@ -1311,6 +1312,8 @@ static bool SinkThenElseCodeToEnd(BranchInst *BI1) {
if (!I2->use_empty())
I2->replaceAllUsesWith(I1);
I1->intersectOptionalDataWith(I2);
// TODO: Use combineMetadata here to preserve what metadata we can
// (analogous to the hoisting case above).
I2->eraseFromParent();
if (UpdateRE1)