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| 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 | 64b5d0f46849f74fac5f853bb335de29cf2e1b83 (patch) | |
| tree | e6ff4563185f2980b265bc6de9066f1776c634c4 /llvm/lib/CodeGen/MachineBasicBlock.cpp | |
| parent | 062c2919494fabd10e68964b571903c8d8577a2c (diff) | |
| download | llvm-64b5d0f46849f74fac5f853bb335de29cf2e1b83.zip llvm-64b5d0f46849f74fac5f853bb335de29cf2e1b83.tar.gz llvm-64b5d0f46849f74fac5f853bb335de29cf2e1b83.tar.bz2 | |
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.
llvm-svn: 86871
Diffstat (limited to 'llvm/lib/CodeGen/MachineBasicBlock.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineBasicBlock.cpp | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/llvm/lib/CodeGen/MachineBasicBlock.cpp b/llvm/lib/CodeGen/MachineBasicBlock.cpp index 7fbdb12..14d6682 100644 --- a/llvm/lib/CodeGen/MachineBasicBlock.cpp +++ b/llvm/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) { |