-void X86RegisterInfo::reMaterialize(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator I,
- unsigned DestReg,
- const MachineInstr *Orig) const {
- // MOV32r0 etc. are implemented with xor which clobbers condition code.
- // Re-materialize them as movri instructions to avoid side effects.
- switch (Orig->getOpcode()) {
- case X86::MOV8r0:
- BuildMI(MBB, I, TII.get(X86::MOV8ri), DestReg).addImm(0);
- break;
- case X86::MOV16r0:
- BuildMI(MBB, I, TII.get(X86::MOV16ri), DestReg).addImm(0);
- break;
- case X86::MOV32r0:
- BuildMI(MBB, I, TII.get(X86::MOV32ri), DestReg).addImm(0);
- break;
- case X86::MOV64r0:
- BuildMI(MBB, I, TII.get(X86::MOV64ri32), DestReg).addImm(0);
- break;
- default: {
- MachineInstr *MI = Orig->clone();
- MI->getOperand(0).setReg(DestReg);
- MBB.insert(I, MI);
- break;
- }
- }
-}
-