diff options
Diffstat (limited to 'contrib/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/contrib/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp index bf6e402..d4e666c 100644 --- a/contrib/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/contrib/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -309,6 +309,11 @@ PPCInstrInfo::commuteInstruction(MachineInstr *MI, bool NewMI) const { unsigned MB = MI->getOperand(4).getImm(); unsigned ME = MI->getOperand(5).getImm(); + // We can't commute a trivial mask (there is no way to represent an all-zero + // mask). + if (MB == 0 && ME == 31) + return nullptr; + if (NewMI) { // Create a new instruction. unsigned Reg0 = ChangeReg0 ? Reg2 : MI->getOperand(0).getReg(); |
