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Introduce a helper to combine instruction metadata.

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Replace the old code in GVN and BBVectorize with it. Update SimplifyCFG to use
it.

Patch by Björn Steinbrink!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215723 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-08-15 15:46:38 +00:00
parent f36437d945
commit d37ec47374
5 changed files with 74 additions and 74 deletions
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36
lib/Transforms/Utils/Local.cpp
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@ -1305,3 +1305,39 @@ bool llvm::removeUnreachableBlocks(Function &F) {
return true;
}
void llvm::combineMetadata(Instruction *K, const Instruction *J, ArrayRef<unsigned> KnownIDs) {
SmallVector<std::pair<unsigned, MDNode*>, 4> Metadata;
K->dropUnknownMetadata(KnownIDs);
K->getAllMetadataOtherThanDebugLoc(Metadata);
for (unsigned i = 0, n = Metadata.size(); i < n; ++i) {
unsigned Kind = Metadata[i].first;
MDNode *JMD = J->getMetadata(Kind);
MDNode *KMD = Metadata[i].second;
switch (Kind) {
default:
K->setMetadata(Kind, nullptr); // Remove unknown metadata
break;
case LLVMContext::MD_dbg:
llvm_unreachable("getAllMetadataOtherThanDebugLoc returned a MD_dbg");
case LLVMContext::MD_tbaa:
K->setMetadata(Kind, MDNode::getMostGenericTBAA(JMD, KMD));
break;
case LLVMContext::MD_alias_scope:
case LLVMContext::MD_noalias:
K->setMetadata(Kind, MDNode::intersect(JMD, KMD));
break;
case LLVMContext::MD_range:
K->setMetadata(Kind, MDNode::getMostGenericRange(JMD, KMD));
break;
case LLVMContext::MD_fpmath:
K->setMetadata(Kind, MDNode::getMostGenericFPMath(JMD, KMD));
break;
case LLVMContext::MD_invariant_load:
// Only set the !invariant.load if it is present in both instructions.
K->setMetadata(Kind, JMD);
break;
}
}
}