1492 void X86_64Assembler::rex(bool force, bool w, Register* r, Register* x, Register* b) {
1498   uint8_t rex = force ? 0x40 : 0;
1500     rex |= 0x48;  // REX.W000
1503     rex |= 0x44;  // REX.0R00
1507     rex |= 0x42;  // REX.00X0
1511     rex |= 0x41;  // REX.000B
1514   if (rex != 0) {
1515     EmitUint8(rex);
1525   uint8_t rex = mem->rex();
1527     rex |= 0x40;  // REX.0000
1530     rex |= 0x48;  // REX.W000
1533     rex |= 0x44;  // REX.0R00
1536   if (rex != 0) {
1537     EmitUint8(rex);
2220   uint8_t rex = force ? 0x40 : 0;  in EmitOptionalRex()  local
2222     rex |= 0x48;  // REX.W000  in EmitOptionalRex()
2225     rex |= 0x44;  // REX.0R00  in EmitOptionalRex()
2228     rex |= 0x42;  // REX.00X0  in EmitOptionalRex()
2231     rex |= 0x41;  // REX.000B  in EmitOptionalRex()
2233   if (rex != 0) {  in EmitOptionalRex()
2234     EmitUint8(rex);  in EmitOptionalRex()
2259   uint8_t rex = operand.rex();  in EmitOptionalRex32()  local
2260   if (rex != 0) {  in EmitOptionalRex32()
2261     EmitUint8(rex);  in EmitOptionalRex32()
2266   uint8_t rex = operand.rex();  in EmitOptionalRex32()  local
2268     rex |= 0x44;  // REX.0R00  in EmitOptionalRex32()
2270   if (rex != 0) {  in EmitOptionalRex32()
2271     EmitUint8(rex);  in EmitOptionalRex32()
2276   uint8_t rex = operand.rex();  in EmitOptionalRex32()  local
2278     rex |= 0x44;  // REX.0R00  in EmitOptionalRex32()
2280   if (rex != 0) {  in EmitOptionalRex32()
2281     EmitUint8(rex);  in EmitOptionalRex32()
2294   uint8_t rex = operand.rex();  in EmitRex64()  local
2295   rex |= 0x48;  // REX.W000  in EmitRex64()
2296   EmitUint8(rex);  in EmitRex64()
2312   uint8_t rex = 0x48 | operand.rex();  // REX.W000  in EmitRex64()  local
2314     rex |= 0x44;  // REX.0R00  in EmitRex64()
2316   EmitUint8(rex);  in EmitRex64()
2320   uint8_t rex = 0x48 | operand.rex();  // REX.W000  in EmitRex64()  local
2322     rex |= 0x44;  // REX.0R00  in EmitRex64()
2324   EmitUint8(rex);  in EmitRex64()
2334   uint8_t rex = operand.rex();  in EmitOptionalByteRegNormalizingRex32()  local
2338     rex |= 0x40;  // REX.0000  in EmitOptionalByteRegNormalizingRex32()
2341     rex |= 0x44;  // REX.0R00  in EmitOptionalByteRegNormalizingRex32()
2343   if (rex != 0) {  in EmitOptionalByteRegNormalizingRex32()
2344     EmitUint8(rex);  in EmitOptionalByteRegNormalizingRex32()