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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 | bf007364bf520a60a48c498472e2dbd76753cf08 (patch) | |
| tree | 2081b32e7828684ae015c9f3448aa3fb36a7ef30 /llvm/lib/CodeGen/BranchFolding.h | |
| parent | fdc02c1b0d810f073146f4b8c72116fe15b72631 (diff) | |
| download | bcm5719-llvm-bf007364bf520a60a48c498472e2dbd76753cf08.tar.gz bcm5719-llvm-bf007364bf520a60a48c498472e2dbd76753cf08.zip | |
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>
llvm-svn: 134565
Diffstat (limited to 'llvm/lib/CodeGen/BranchFolding.h')
| -rw-r--r-- | llvm/lib/CodeGen/BranchFolding.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/BranchFolding.h b/llvm/lib/CodeGen/BranchFolding.h index 4ed42c03464..df795dfc248 100644 --- a/llvm/lib/CodeGen/BranchFolding.h +++ b/llvm/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, |
