[PATCH] D30632: [LoopUnrolling] Fix loop size check for peeling
Max Kazantsev via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sun Mar 5 20:41:11 PST 2017
mkazantsev updated this revision to Diff 90641.
https://reviews.llvm.org/D30632
Files:
lib/Transforms/Utils/LoopUnrollPeel.cpp
Index: lib/Transforms/Utils/LoopUnrollPeel.cpp
===================================================================
--- lib/Transforms/Utils/LoopUnrollPeel.cpp
+++ lib/Transforms/Utils/LoopUnrollPeel.cpp
@@ -75,25 +75,27 @@
// its only back edge. If there is such Phi, peeling 1 iteration from the
// loop is profitable, because starting from 2nd iteration we will have an
// invariant instead of this Phi.
- if (auto *BackEdge = L->getLoopLatch()) {
- BasicBlock *Header = L->getHeader();
- // Iterate over Phis to find one with invariant input on back edge.
- bool FoundCandidate = false;
- PHINode *Phi;
- for (auto BI = Header->begin(); isa<PHINode>(&*BI); ++BI) {
- Phi = cast<PHINode>(&*BI);
- Value *Input = Phi->getIncomingValueForBlock(BackEdge);
- if (L->isLoopInvariant(Input)) {
- FoundCandidate = true;
- break;
+ if (LoopSize <= UP.Threshold) {
+ if (auto *BackEdge = L->getLoopLatch()) {
+ BasicBlock *Header = L->getHeader();
+ // Iterate over Phis to find one with invariant input on back edge.
+ bool FoundCandidate = false;
+ PHINode *Phi;
+ for (auto BI = Header->begin(); isa<PHINode>(&*BI); ++BI) {
+ Phi = cast<PHINode>(&*BI);
+ Value *Input = Phi->getIncomingValueForBlock(BackEdge);
+ if (L->isLoopInvariant(Input)) {
+ FoundCandidate = true;
+ break;
+ }
+ }
+ if (FoundCandidate) {
+ DEBUG(dbgs() << "Peel one iteration to get rid of " << *Phi
+ << " because starting from 2nd iteration it is always"
+ << " an invariant\n");
+ UP.PeelCount = 1;
+ return;
}
- }
- if (FoundCandidate) {
- DEBUG(dbgs() << "Peel one iteration to get rid of " << *Phi
- << " because starting from 2nd iteration it is always"
- << " an invariant\n");
- UP.PeelCount = 1;
- return;
}
}
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