diff options
| -rw-r--r-- | lib/CodeGen/MachineLICM.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/CodeGen/MachineLICM.cpp b/lib/CodeGen/MachineLICM.cpp index 302581f4dd..1ec32b5336 100644 --- a/lib/CodeGen/MachineLICM.cpp +++ b/lib/CodeGen/MachineLICM.cpp @@ -273,7 +273,14 @@ bool MachineLICM::IsLoopInvariantInst(MachineInstr &I) { for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) { const MachineOperand &MO = I.getOperand(i); - if (!MO.isRegister() || !MO.isUse()) + if (!MO.isRegister()) + continue; + + if (MO.isDef() && TargetRegisterInfo::isPhysicalRegister(MO.getReg())) + // Don't hoist an instruction that defines a physical register. + return false; + + if (!MO.isUse()) continue; unsigned Reg = MO.getReg(); |