diff options
Diffstat (limited to 'lib/CodeGen/MachineCSE.cpp')
| -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? |