diff options
| author | Andrew Trick <atrick@apple.com> | 2011-12-10 00:25:00 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2011-12-10 00:25:00 +0000 |
| commit | fa1948a40f14d98c1a31a2ec19035a2d5254e854 (patch) | |
| tree | aabe5d0b5556ea47bbe49448950e27a9c67eb1db /lib/Transforms/Scalar/LoopStrengthReduce.cpp | |
| parent | 48171e7fbe58bb418f09717813779d03903d35e4 (diff) | |
LSR: ignore strides in outer loops.
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
Diffstat (limited to 'lib/Transforms/Scalar/LoopStrengthReduce.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopStrengthReduce.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp index 7867d9fad3..ad2f52d8ec 100644 --- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -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()); |