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Process the step before the start, because it's usually the simpler 

of the two.

llvm-svn: 111495
This commit is contained in:
Dan Gohman 2010-08-19 01:02:31 +00:00
parent beb506eeed
commit 129a816ee6
1 changed files with 3 additions and 3 deletions
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6
llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -441,12 +441,12 @@ static const SCEV *getExactSDiv(const SCEV *LHS, const SCEV *RHS,
// Distribute the sdiv over addrec operands, if the addrec doesn't overflow.
if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(LHS)) {
if (IgnoreSignificantBits || isAddRecSExtable(AR, SE)) {
const SCEV *Start = getExactSDiv(AR->getStart(), RHS, SE,
IgnoreSignificantBits);
if (!Start) return 0;
const SCEV *Step = getExactSDiv(AR->getStepRecurrence(SE), RHS, SE,
IgnoreSignificantBits);
if (!Step) return 0;
const SCEV *Start = getExactSDiv(AR->getStart(), RHS, SE,
IgnoreSignificantBits);
if (!Start) return 0;
return SE.getAddRecExpr(Start, Step, AR->getLoop());
}
return 0;