diff options
| 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 | db8771af286bc84267e7b5bd17eab51cd4ea552f (patch) | |
| tree | 2c677d60e37c1f22f63a26a354e5536357608089 /lib/CodeGen | |
| parent | 93d6a7e9c21204c52d6efec6c672163e7de79660 (diff) | |
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100170 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/MachineCSE.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp index fc9dea8e82..597d51d4f3 100644 --- a/lib/CodeGen/MachineCSE.cpp +++ b/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? |