diff options
| author | Dan Gohman <gohman@apple.com> | 2009-11-11 19:48:59 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-11-11 19:48:59 +0000 |
| commit | 2210c0bea83aa8a8585d793a1f63e8c01b65be38 (patch) | |
| tree | b424f49eec4e671264bc206aef236dbb369e08aa /lib/CodeGen/MachineBasicBlock.cpp | |
| parent | 3e20475feebca3bfb29375ac7f3e5acbeb2a95c8 (diff) | |
Add support for tail duplication to BranchFolding, and extend
tail merging support to handle more cases.
- Recognize several cases where tail merging is beneficial even when
the tail size is smaller than the generic threshold.
- Make use of MachineInstrDesc::isBarrier to help detect
non-fallthrough blocks.
- Check for and avoid disrupting fall-through edges in more cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86871 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineBasicBlock.cpp')
| -rw-r--r-- | lib/CodeGen/MachineBasicBlock.cpp | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp index 7fbdb128fd..14d66821bb 100644 --- a/lib/CodeGen/MachineBasicBlock.cpp +++ b/lib/CodeGen/MachineBasicBlock.cpp @@ -371,10 +371,7 @@ bool MachineBasicBlock::CorrectExtraCFGEdges(MachineBasicBlock *DestA, MachineBasicBlock::succ_iterator SI = succ_begin(); MachineBasicBlock *OrigDestA = DestA, *OrigDestB = DestB; while (SI != succ_end()) { - if (*SI == DestA && DestA == DestB) { - DestA = DestB = 0; - ++SI; - } else if (*SI == DestA) { + if (*SI == DestA) { DestA = 0; ++SI; } else if (*SI == DestB) { |