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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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146302 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-12-10 00:25:00 +00:00
parent 48171e7fbe
commit fa1948a40f
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());