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| author | Eli Friedman <eli.friedman@gmail.com> | 2011-07-06 23:41:48 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2011-07-06 23:41:48 +0000 |
| commit | a38cfb2fceb266bd78164021c08284dc59a1e8a3 (patch) | |
| tree | 13b80d12f19b28d8a08957a769e6c6cfeac8814e /lib/CodeGen/BranchFolding.h | |
| parent | 66c9ee7e6d7072a5ecc0131b9dd78a20e72cb597 (diff) | |
| download | external_llvm-a38cfb2fceb266bd78164021c08284dc59a1e8a3.zip external_llvm-a38cfb2fceb266bd78164021c08284dc59a1e8a3.tar.gz external_llvm-a38cfb2fceb266bd78164021c08284dc59a1e8a3.tar.bz2 | |
When tail-merging multiple blocks, make sure to correctly update the live-in list on the merged block to correctly account for the live-outs of all the predecessors. They might not be the same in all cases (the testcase I have involves a PHI node where one of the operands is an IMPLICIT_DEF).
Unfortunately, the testcase I have is large and confidential, so I don't have a test to commit at the moment; I'll see if I can come up with something smaller where this issue reproduces.
<rdar://problem/9716278>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134565 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/BranchFolding.h')
| -rw-r--r-- | lib/CodeGen/BranchFolding.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/CodeGen/BranchFolding.h b/lib/CodeGen/BranchFolding.h index 4ed42c0..df795df 100644 --- a/lib/CodeGen/BranchFolding.h +++ b/lib/CodeGen/BranchFolding.h @@ -95,6 +95,8 @@ namespace llvm { bool TailMergeBlocks(MachineFunction &MF); bool TryTailMergeBlocks(MachineBasicBlock* SuccBB, MachineBasicBlock* PredBB); + void MaintainLiveIns(MachineBasicBlock *CurMBB, + MachineBasicBlock *NewMBB); void ReplaceTailWithBranchTo(MachineBasicBlock::iterator OldInst, MachineBasicBlock *NewDest); MachineBasicBlock *SplitMBBAt(MachineBasicBlock &CurMBB, |