251     data_.buf[0] = mod << 6 | rm_reg.low_bits();  in set_modrm()
262     data_.buf[1] = (scale << 6) | (index.low_bits() << 3) | base.low_bits();  in set_sib()
709   if (rm_reg.low_bits() == 4)  {  // Forces SIB byte.  in arithmetic_op()
725   if (rm_reg.low_bits() == 4) {  // Forces SIB byte.  in arithmetic_op_16()
762   if (rm_reg.low_bits() == 4)  {  // Forces SIB byte.  in arithmetic_op_8()
936   emit(0xC8 + dst.low_bits());  in bswapl()
943   emit(0xC8 + dst.low_bits());  in bswapq()
1699   emit(0xB0 + dst.low_bits());  in movb()
1759   if (src.low_bits() == 4) {  in emit_mov()
1786     emit(0xB8 + dst.low_bits());  in emit_mov()
1808     emit(0xB8 | dst.low_bits());  in movp()
1816   emit(0xB8 | dst.low_bits());  in movp_heap_number()
1830     emit(0xB8 | dst.low_bits());  in movq()
2163   emit(0x58 | dst.low_bits());  in popq()
2183   emit(0x50 | src.low_bits());  in pushq()
2298     emit(0x90 | other.low_bits());  in emit_xchg()
2299   } else if (dst.low_bits() == 4) {  in emit_xchg()
2383   if (src.low_bits() == 4) std::swap(dst, src);  in emit_test()
3034   if (dst.low_bits() == 4) {  in movq()
3294   if (src.low_bits() == 4) {  in movaps()
3323   if (src.low_bits() == 4) {  in movapd()
4736   if (src.low_bits() == 4) {  in movups()
4905   emit(0xC0 | (dst.low_bits() << 3) | src.low_bits());  in emit_sse_operand()
4910   emit(0xC0 | (dst.low_bits() << 3) | src.low_bits());  in emit_sse_operand()
4915   emit(0xC0 | (dst.low_bits() << 3) | src.low_bits());  in emit_sse_operand()
4919   emit(0xD8 | dst.low_bits());  in emit_sse_operand()