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LSR: ignore strides in outer loops.

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Since we're not rewriting IVs in other loops, there's not much reason
to consider their stride when generating formulae.
This should reduce the number of useless formulas considered by LSR.

llvm-svn: 146302
This commit is contained in:
Andrew Trick 2011-12-10 00:25:00 +00:00
parent ece09e5e6b
commit 65fca605c6
1 changed files with 2 additions and 1 deletions
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3
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2061,7 +2061,8 @@ void LSRInstance::CollectInterestingTypesAndFactors() {
do {
const SCEV *S = Worklist.pop_back_val();
if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) {
Strides.insert(AR->getStepRecurrence(SE));
if (EnableNested || AR->getLoop() == L)
Strides.insert(AR->getStepRecurrence(SE));
Worklist.push_back(AR->getStart());
} else if (const SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(S)) {
Worklist.append(Add->op_begin(), Add->op_end());