ref: 9b144a94e2e8cebf8082c8418ca3a7338c0677c1
dir: /sys/src/ape/lib/ap/386/cycles.s/
#define RDTSC BYTE $0x0F; BYTE $0x31 TEXT _cycles(SB),1,$0 /* time stamp counter; cycles since power up */ RDTSC MOVL vlong+0(FP), CX /* &vlong */ MOVL AX, 0(CX) /* lo */ MOVL DX, 4(CX) /* hi */ RET