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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 | a83ac2d9e7b990df6978598d9dec860b5ef13a9a (patch) | |
| tree | a0ac873f025057cdce7b82ad870f52de16f6e107 /llvm/lib/Transforms/Scalar/LoopUnswitch.cpp | |
| parent | 87869bc435c1fb81ae0a3fd5c76becaaa0f90284 (diff) | |
| download | bcm5719-llvm-a83ac2d9e7b990df6978598d9dec860b5ef13a9a.tar.gz bcm5719-llvm-a83ac2d9e7b990df6978598d9dec860b5ef13a9a.zip | |
Update various Loop optimization passes to cope with the possibility that
LoopSimplify form may not be available.
llvm-svn: 86175
Diffstat (limited to 'llvm/lib/Transforms/Scalar/LoopUnswitch.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/LoopUnswitch.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp b/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp index c7b00da159c..be8366d98c4 100644 --- a/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp +++ b/llvm/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)) { |
