2704 void X86_64Assembler::rex(bool force, bool w, Register* r, Register* x, Register* b) {
2710   uint8_t rex = force ? 0x40 : 0;
2712     rex |= 0x48;  // REX.W000
2715     rex |= 0x44;  // REX.0R00
2719     rex |= 0x42;  // REX.00X0
2723     rex |= 0x41;  // REX.000B
2726   if (rex != 0) {
2727     EmitUint8(rex);
2737   uint8_t rex = mem->rex();
2739     rex |= 0x40;  // REX.0000
2742     rex |= 0x48;  // REX.W000
2745     rex |= 0x44;  // REX.0R00
2748   if (rex != 0) {
2749     EmitUint8(rex);
3757   uint8_t rex = force ? 0x40 : 0;  in EmitOptionalRex()  local
3759     rex |= 0x48;  // REX.W000  in EmitOptionalRex()
3762     rex |= 0x44;  // REX.0R00  in EmitOptionalRex()
3765     rex |= 0x42;  // REX.00X0  in EmitOptionalRex()
3768     rex |= 0x41;  // REX.000B  in EmitOptionalRex()
3770   if (rex != 0) {  in EmitOptionalRex()
3771     EmitUint8(rex);  in EmitOptionalRex()
3796   uint8_t rex = operand.rex();  in EmitOptionalRex32()  local
3797   if (rex != 0) {  in EmitOptionalRex32()
3798     EmitUint8(rex);  in EmitOptionalRex32()
3803   uint8_t rex = operand.rex();  in EmitOptionalRex32()  local
3805     rex |= 0x44;  // REX.0R00  in EmitOptionalRex32()
3807   if (rex != 0) {  in EmitOptionalRex32()
3808     EmitUint8(rex);  in EmitOptionalRex32()
3813   uint8_t rex = operand.rex();  in EmitOptionalRex32()  local
3815     rex |= 0x44;  // REX.0R00  in EmitOptionalRex32()
3817   if (rex != 0) {  in EmitOptionalRex32()
3818     EmitUint8(rex);  in EmitOptionalRex32()
3831   uint8_t rex = operand.rex();  in EmitRex64()  local
3832   rex |= 0x48;  // REX.W000  in EmitRex64()
3833   EmitUint8(rex);  in EmitRex64()
3849   uint8_t rex = 0x48 | operand.rex();  // REX.W000  in EmitRex64()  local
3851     rex |= 0x44;  // REX.0R00  in EmitRex64()
3853   EmitUint8(rex);  in EmitRex64()
3857   uint8_t rex = 0x48 | operand.rex();  // REX.W000  in EmitRex64()  local
3859     rex |= 0x44;  // REX.0R00  in EmitRex64()
3861   EmitUint8(rex);  in EmitRex64()
3871   uint8_t rex = operand.rex();  in EmitOptionalByteRegNormalizingRex32()  local
3875     rex |= 0x40;  // REX.0000  in EmitOptionalByteRegNormalizingRex32()
3878     rex |= 0x44;  // REX.0R00  in EmitOptionalByteRegNormalizingRex32()
3880   if (rex != 0) {  in EmitOptionalByteRegNormalizingRex32()
3881     EmitUint8(rex);  in EmitOptionalByteRegNormalizingRex32()