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| author | Chris Lattner <sabre@nondot.org> | 2011-01-15 07:36:13 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2011-01-15 07:36:13 +0000 |
| commit | 8df83c4a240293463700b0b97ca9e5425878c0ef (patch) | |
| tree | 55369f41522b8b2ef02baf063cc7dfbed39b767d /llvm/lib/Transforms | |
| parent | ee588defc6957cbd9624e0061f7e6f20e5189f4a (diff) | |
| download | bcm5719-llvm-8df83c4a240293463700b0b97ca9e5425878c0ef.tar.gz bcm5719-llvm-8df83c4a240293463700b0b97ca9e5425878c0ef.zip | |
fix rdar://8785296 - -fcatch-undefined-behavior generates inefficient code
The basic issue is that isel (very reasonably!) expects conditional branches
to be folded, so CGP leaving around a bunch dead computation feeding
conditional branches isn't such a good idea. Just fold branches on constants
into unconditional branches.
llvm-svn: 123526
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp b/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp index 72c8bf30477..3496aa20abb 100644 --- a/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp +++ b/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp @@ -1071,6 +1071,9 @@ bool CodeGenPrepare::OptimizeInst(Instruction *I) { if (CallInst *CI = dyn_cast<CallInst>(I)) return OptimizeCallInst(CI); + if (isa<TerminatorInst>(I)) + return ConstantFoldTerminator(I->getParent()); + return false; } |
