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| author | Chris Lattner <sabre@nondot.org> | 2006-11-18 22:25:39 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-11-18 22:25:39 +0000 |
| commit | ea017f66f709b32e900d3203bf371193d29d522a (patch) | |
| tree | 92481b5eab65caf8a9a95b17299c3ff1bf3abaa3 /llvm/lib/CodeGen/BranchFolding.cpp | |
| parent | 56ec81ff731c4f515eb59faf8139b93179216c13 (diff) | |
| download | bcm5719-llvm-ea017f66f709b32e900d3203bf371193d29d522a.tar.gz bcm5719-llvm-ea017f66f709b32e900d3203bf371193d29d522a.zip | |
Don't transform in another bad case: if the block is empty, it should be
simplified before we do this xform so that our cost model is accurate.
llvm-svn: 31864
Diffstat (limited to 'llvm/lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/BranchFolding.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp index c69930da81e..8ded3cdc64d 100644 --- a/llvm/lib/CodeGen/BranchFolding.cpp +++ b/llvm/lib/CodeGen/BranchFolding.cpp @@ -729,7 +729,8 @@ void BranchFolder::OptimizeBlock(MachineBasicBlock *MBB) { // // In this case, we could actually be moving the return block *into* a // loop! - if (DoTransform && !MBB->succ_empty() && !CanFallThrough(PriorTBB)) + if (DoTransform && !MBB->succ_empty() && + (!CanFallThrough(PriorTBB) || PriorTBB->empty())) DoTransform = false; |
