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SLPVectorizer: Accelerate the isConsecutive check by replacing the subtraction of the two values with a simple SCEV expression that adds the offset to one of the pointers that we compare.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186479 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-07-17 00:48:31 +00:00
parent fe47bf8fa0
commit a38edf071d
1 changed files with 5 additions and 10 deletions
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15
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -1004,19 +1004,14 @@ bool BoUpSLP::isConsecutiveAccess(Value *A, Value *B) {
// Calculate the distance.
const SCEV *PtrSCEVA = SE->getSCEV(PtrA);
const SCEV *PtrSCEVB = SE->getSCEV(PtrB);
const SCEV *OffsetSCEV = SE->getMinusSCEV(PtrSCEVB, PtrSCEVA);
const SCEVConstant *ConstOffSCEV = dyn_cast<SCEVConstant>(OffsetSCEV);
// Non constant distance.
if (!ConstOffSCEV)
return false;
int64_t Offset = ConstOffSCEV->getValue()->getSExtValue();
Type *Ty = cast<PointerType>(PtrA->getType())->getElementType();
// The Instructions are consecutive if the size of the first load/store is
// The instructions are consecutive if the size of the first load/store is
// the same as the offset.
int64_t Sz = DL->getTypeStoreSize(Ty);
return (Offset == Sz);
const SCEV *C = SE->getConstant(PtrSCEVA->getType(), Sz);
const SCEV *X = SE->getAddExpr(PtrSCEVA, C);
return X == PtrSCEVB;
}
Value *BoUpSLP::getSinkBarrier(Instruction *Src, Instruction *Dst) {