================
@@ -7594,16 +7595,28 @@ MachineInstr *X86InstrInfo::foldMemoryOperandImpl(
if (NoNDDM && !IsTwoAddr) {
Register SrcReg = MI.getOperand(1).getReg();
+ unsigned SrcSub = MI.getOperand(1).getSubReg();
if (MI.killsRegister(SrcReg, /*TRI=*/nullptr))
return NewMI;
const TargetRegisterClass &RC = *MF.getRegInfo().getRegClass(SrcReg);
- Register NewSrc = MF.getRegInfo().createVirtualRegister(&RC);
- BuildMI(*NewMI->getParent(), *NewMI, MI.getDebugLoc(),
- get(TargetOpcode::COPY))
- .addReg(NewSrc, RegState::Define)
- .addReg(SrcReg);
+ MachineRegisterInfo &MRI = MF.getRegInfo();
+ unsigned SubReg = X86::NoSubRegister;
+ Register NewSrc;
+
+ if (MRI.isSSA()) {
----------------
phoebewang wrote:
foldMemoryOperand called by X86FastISel and PeepholeOptimizer. Both are SSA
form.
https://github.com/llvm/llvm-project/pull/191368
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