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| author | Dan Gohman <gohman@apple.com> | 2009-11-05 21:11:53 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-11-05 21:11:53 +0000 |
| commit | 03e896bd6073efc4523d8bcd0239d6ed62126db7 (patch) | |
| tree | 940b395910c450d7c9e00a014e1592e4982bdca8 /lib/Transforms/Scalar/LoopUnswitch.cpp | |
| parent | 7040d6e2f5d503e9948b9caff940a66238a0c605 (diff) | |
| download | llvm-03e896bd6073efc4523d8bcd0239d6ed62126db7.tar.gz llvm-03e896bd6073efc4523d8bcd0239d6ed62126db7.tar.bz2 llvm-03e896bd6073efc4523d8bcd0239d6ed62126db7.tar.xz | |
Update various Loop optimization passes to cope with the possibility that
LoopSimplify form may not be available.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86175 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/LoopUnswitch.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopUnswitch.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/LoopUnswitch.cpp b/lib/Transforms/Scalar/LoopUnswitch.cpp index c7b00da159..be8366d98c 100644 --- a/lib/Transforms/Scalar/LoopUnswitch.cpp +++ b/lib/Transforms/Scalar/LoopUnswitch.cpp @@ -407,6 +407,10 @@ bool LoopUnswitch::UnswitchIfProfitable(Value *LoopCond, Constant *Val){ initLoopData(); Function *F = loopHeader->getParent(); + // If LoopSimplify was unable to form a preheader, don't do any unswitching. + if (!loopPreheader) + return false; + // If the condition is trivial, always unswitch. There is no code growth for // this case. if (!IsTrivialUnswitchCondition(LoopCond)) { |