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| author | Andrew Trick <atrick@apple.com> | 2011-10-04 03:50:44 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2011-10-04 03:50:44 +0000 |
| commit | f143b79b78d1d244809fa59320f2af2edf4e1a86 (patch) | |
| tree | d98851fb9036648d18eeb33137346849071a4847 /lib/Transforms/Scalar/LoopStrengthReduce.cpp | |
| parent | 2aeb8027d649320d5ad3a30d9bbeb71c783b50d4 (diff) | |
| download | llvm-f143b79b78d1d244809fa59320f2af2edf4e1a86.tar.gz llvm-f143b79b78d1d244809fa59320f2af2edf4e1a86.tar.bz2 llvm-f143b79b78d1d244809fa59320f2af2edf4e1a86.tar.xz | |
LSR should avoid redundant edge splitting.
This handles the case in which LSR rewrites an IV user that is a phi and
splits critical edges originating from a switch.
Fixes <rdar://problem/6453893> LSR is not splitting edges "nicely"
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141059 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/LoopStrengthReduce.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopStrengthReduce.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp index 7b1a340156..4b6c55e162 100644 --- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -3677,7 +3677,9 @@ void LSRInstance::RewriteForPHI(PHINode *PN, // Split the critical edge. BasicBlock *NewBB = 0; if (!Parent->isLandingPad()) { - NewBB = SplitCriticalEdge(BB, Parent, P); + NewBB = SplitCriticalEdge(BB, Parent, P, + /*MergeIdenticalEdges=*/true, + /*DontDeleteUselessPhis=*/true); } else { SmallVector<BasicBlock*, 2> NewBBs; SplitLandingPadPredecessors(Parent, BB, "", "", P, NewBBs); |