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| author | Evan Cheng <evan.cheng@apple.com> | 2010-04-02 02:21:24 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-04-02 02:21:24 +0000 |
| commit | 604bc162daa21fca33fb2c71b4af52e35a29f60f (patch) | |
| tree | d7968bacf81644ee20e215d273a8a464fd7f99f5 /llvm/lib/CodeGen/MachineCSE.cpp | |
| parent | 4a70ae54b4b86cc97bb07e20c9e1d71439fb88b6 (diff) | |
| download | bcm5719-llvm-604bc162daa21fca33fb2c71b4af52e35a29f60f.tar.gz bcm5719-llvm-604bc162daa21fca33fb2c71b4af52e35a29f60f.zip | |
After trivial coalescing, the MI being visited may have become a copy. Avoid adding it to CSE hash table since copies aren't being considered for CSE and they may be deleted.
rdar://7819990
llvm-svn: 100170
Diffstat (limited to 'llvm/lib/CodeGen/MachineCSE.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCSE.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp index fc9dea8e827..597d51d4f37 100644 --- a/llvm/lib/CodeGen/MachineCSE.cpp +++ b/llvm/lib/CodeGen/MachineCSE.cpp @@ -294,8 +294,12 @@ bool MachineCSE::ProcessBlock(MachineDomTreeNode *Node) { bool FoundCSE = VNT.count(MI); if (!FoundCSE) { // Look for trivial copy coalescing opportunities. - if (PerformTrivialCoalescing(MI, MBB)) + if (PerformTrivialCoalescing(MI, MBB)) { + // After coalescing MI itself may become a copy. + if (isCopy(MI, TII)) + continue; FoundCSE = VNT.count(MI); + } } // FIXME: commute commutable instructions? |
