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Migrate metadata information from scalar to vector instructions during

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SLP vectorization. Based on the code in BBVectorizer.

Fixes PR17741.

Patch by Raul Silvera, reviewed by Hal and Nadav. Reformatted by my
driving of clang-format. =]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195528 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2013-11-23 00:48:34 +00:00
parent b88831b204
commit fbe605e712
1 changed files with 37 additions and 2 deletions
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39
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -163,6 +163,37 @@ static unsigned getSameOpcode(ArrayRef<Value *> VL) {
return Opcode;
}
/// \returns \p I after propagating metadata from \p VL.
static Instruction *propagateMetadata(Instruction *I, ArrayRef<Value *> VL) {
Instruction *I0 = cast<Instruction>(VL[0]);
SmallVector<std::pair<unsigned, MDNode *>, 4> Metadata;
I0->getAllMetadataOtherThanDebugLoc(Metadata);
for (unsigned i = 0, n = Metadata.size(); i != n; ++i) {
unsigned Kind = Metadata[i].first;
MDNode *MD = Metadata[i].second;
for (int i = 1, e = VL.size(); MD && i != e; i++) {
Instruction *I = cast<Instruction>(VL[i]);
MDNode *IMD = I->getMetadata(Kind);
switch (Kind) {
default:
MD = 0; // Remove unknown metadata
break;
case LLVMContext::MD_tbaa:
MD = MDNode::getMostGenericTBAA(MD, IMD);
break;
case LLVMContext::MD_fpmath:
MD = MDNode::getMostGenericFPMath(MD, IMD);
break;
}
}
I->setMetadata(Kind, MD);
}
return I;
}
/// \returns The type that all of the values in \p VL have or null if there
/// are different types.
static Type* getSameType(ArrayRef<Value *> VL) {
@ -1481,6 +1512,10 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
BinaryOperator *BinOp = cast<BinaryOperator>(VL0);
Value *V = Builder.CreateBinOp(BinOp->getOpcode(), LHS, RHS);
E->VectorizedValue = V;
if (Instruction *I = dyn_cast<Instruction>(V))
return propagateMetadata(I, E->Scalars);
return V;
}
case Instruction::Load: {
@ -1497,7 +1532,7 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
LI = Builder.CreateLoad(VecPtr);
LI->setAlignment(Alignment);
E->VectorizedValue = LI;
return LI;
return propagateMetadata(LI, E->Scalars);
}
case Instruction::Store: {
StoreInst *SI = cast<StoreInst>(VL0);
@ -1516,7 +1551,7 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
StoreInst *S = Builder.CreateStore(VecValue, VecPtr);
S->setAlignment(Alignment);
E->VectorizedValue = S;
return S;
return propagateMetadata(S, E->Scalars);
}
default:
llvm_unreachable("unknown inst");