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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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39
lib/Transforms/Vectorize/BBVectorize.cpp
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@ -391,8 +391,6 @@ namespace {
Instruction *&InsertionPt,
Instruction *I, Instruction *J);
void combineMetadata(Instruction *K, const Instruction *J);
bool vectorizeBB(BasicBlock &BB) {
if (skipOptnoneFunction(BB))
return false;
@ -2964,35 +2962,6 @@ namespace {
}
}
// When the first instruction in each pair is cloned, it will inherit its
// parent's metadata. This metadata must be combined with that of the other
// instruction in a safe way.
void BBVectorize::combineMetadata(Instruction *K, const Instruction *J) {
SmallVector<std::pair<unsigned, MDNode*>, 4> Metadata;
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_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_fpmath:
K->setMetadata(Kind, MDNode::getMostGenericFPMath(JMD, KMD));
break;
}
}
}
// This function fuses the chosen instruction pairs into vector instructions,
// taking care preserve any needed scalar outputs and, then, it reorders the
// remaining instructions as needed (users of the first member of the pair
@ -3142,7 +3111,13 @@ namespace {
if (!isa<StoreInst>(K))
K->mutateType(getVecTypeForPair(L->getType(), H->getType()));
combineMetadata(K, H);
unsigned KnownIDs[] = {
LLVMContext::MD_tbaa,
LLVMContext::MD_alias_scope,
LLVMContext::MD_noalias,
LLVMContext::MD_fpmath
};
combineMetadata(K, H, KnownIDs);
K->intersectOptionalDataWith(H);
for (unsigned o = 0; o < NumOperands; ++o)