diff options
| -rw-r--r-- | lib/CodeGen/RegisterCoalescer.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp index 6e7d90dd65..70a2462880 100644 --- a/lib/CodeGen/RegisterCoalescer.cpp +++ b/lib/CodeGen/RegisterCoalescer.cpp @@ -2072,6 +2072,9 @@ static bool isLocalCopy(MachineInstr *Copy, const LiveIntervals *LIS) { if (!Copy->isCopy()) return false; + if (Copy->getOperand(1).isUndef()) + return false; + unsigned SrcReg = Copy->getOperand(1).getReg(); unsigned DstReg = Copy->getOperand(0).getReg(); if (TargetRegisterInfo::isPhysicalRegister(SrcReg) |