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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 | eeba3f5695e39ca970a7aeb161558575216005b2 (patch) | |
| tree | 2f42b2f1c59fe0888c4357c3a3b0f68db85a29fb /lib | |
| parent | 1a8943a1f872a47b821fe7075f07b42403fa1a3f (diff) | |
| download | external_llvm-eeba3f5695e39ca970a7aeb161558575216005b2.zip external_llvm-eeba3f5695e39ca970a7aeb161558575216005b2.tar.gz external_llvm-eeba3f5695e39ca970a7aeb161558575216005b2.tar.bz2 | |
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123526 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/CodeGenPrepare.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp index 72c8bf3..3496aa2 100644 --- a/lib/Transforms/Scalar/CodeGenPrepare.cpp +++ b/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; } |