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Fix a bug in the vectorization of wide load/store operations.

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We used a SCEV to detect that A[X] is consecutive. We assumed that X was
the induction variable. But X can be any expression that uses the induction
for example: X = i + 2;



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166388 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-10-21 06:49:10 +00:00
parent c847872629
commit bb950854ac
2 changed files with 44 additions and 4 deletions
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18
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -740,10 +740,15 @@ SingleBlockLoopVectorizer::vectorizeLoop(LoopVectorizationLegality *Legal) {
break;
}
// The last index does not have to be the induction. It can be
// consecutive and be a function of the index. For example A[I+1];
unsigned NumOperands = Gep->getNumOperands();
Value *LastIndex = getVectorValue(Gep->getOperand(NumOperands -1));
LastIndex = Builder.CreateExtractElement(LastIndex, Builder.getInt32(0));
// Create the new GEP with the new induction variable.
GetElementPtrInst *Gep2 = cast<GetElementPtrInst>(Gep->clone());
unsigned NumOperands = Gep->getNumOperands();
Gep2->setOperand(NumOperands - 1, Induction);
Gep2->setOperand(NumOperands - 1, LastIndex);
Ptr = Builder.Insert(Gep2);
Ptr = Builder.CreateBitCast(Ptr, StTy->getPointerTo());
Value *Val = getVectorValue(SI->getValueOperand());
@ -764,10 +769,15 @@ SingleBlockLoopVectorizer::vectorizeLoop(LoopVectorizationLegality *Legal) {
break;
}
// The last index does not have to be the induction. It can be
// consecutive and be a function of the index. For example A[I+1];
unsigned NumOperands = Gep->getNumOperands();
Value *LastIndex = getVectorValue(Gep->getOperand(NumOperands -1));
LastIndex = Builder.CreateExtractElement(LastIndex, Builder.getInt32(0));
// Create the new GEP with the new induction variable.
GetElementPtrInst *Gep2 = cast<GetElementPtrInst>(Gep->clone());
unsigned NumOperands = Gep->getNumOperands();
Gep2->setOperand(NumOperands - 1, Induction);
Gep2->setOperand(NumOperands - 1, LastIndex);
Ptr = Builder.Insert(Gep2);
Ptr = Builder.CreateBitCast(Ptr, RetTy->getPointerTo());
LI = Builder.CreateLoad(Ptr);