961   uint8_t REX = 0;  in DetermineREXPrefix()  local
965     REX |= 1 << 3; // set REX.W  in DetermineREXPrefix()
967   if (MI.getNumOperands() == 0) return REX;  in DetermineREXPrefix()
982     REX |= 0x40; // REX fixed encoding prefix  in DetermineREXPrefix()
988     REX |= isX86_64ExtendedReg(MI, CurOp++) << 0; // REX.B  in DetermineREXPrefix()
991     REX |= isX86_64ExtendedReg(MI, CurOp++) << 2; // REX.R  in DetermineREXPrefix()
992     REX |= isX86_64ExtendedReg(MI, CurOp++) << 0; // REX.B  in DetermineREXPrefix()
995     REX |= isX86_64ExtendedReg(MI, CurOp++) << 2; // REX.R  in DetermineREXPrefix()
996     REX |= isX86_64ExtendedReg(MI, MemOperand+X86::AddrBaseReg) << 0; // REX.B  in DetermineREXPrefix()
997     REX |= isX86_64ExtendedReg(MI, MemOperand+X86::AddrIndexReg) << 1; // REX.X  in DetermineREXPrefix()
1002     REX |= isX86_64ExtendedReg(MI, CurOp++) << 0; // REX.B  in DetermineREXPrefix()
1003     REX |= isX86_64ExtendedReg(MI, CurOp++) << 2; // REX.R  in DetermineREXPrefix()
1006     REX |= isX86_64ExtendedReg(MI, MemOperand+X86::AddrBaseReg) << 0; // REX.B  in DetermineREXPrefix()
1007     REX |= isX86_64ExtendedReg(MI, MemOperand+X86::AddrIndexReg) << 1; // REX.X  in DetermineREXPrefix()
1009     REX |= isX86_64ExtendedReg(MI, CurOp++) << 2; // REX.R  in DetermineREXPrefix()
1016     REX |= isX86_64ExtendedReg(MI, MemOperand+X86::AddrBaseReg) << 0; // REX.B  in DetermineREXPrefix()
1017     REX |= isX86_64ExtendedReg(MI, MemOperand+X86::AddrIndexReg) << 1; // REX.X  in DetermineREXPrefix()
1024     REX |= isX86_64ExtendedReg(MI, CurOp++) << 0; // REX.B  in DetermineREXPrefix()
1027   if (REX && UsesHighByteReg)  in DetermineREXPrefix()
1030   return REX;  in DetermineREXPrefix()
1087     if (uint8_t REX = DetermineREXPrefix(MI, TSFlags, MemOperand, Desc)) {  in emitOpcodePrefix()  local
1088       EmitByte(0x40 | REX, CurByte, OS);  in emitOpcodePrefix()