ref: 7c98cda87f2328baf5fe4fab48aadc0b8277d047 dir: /plan9_builtins_amd64.s/
TEXT __builtin_clz(SB),1,$0 BYTE $0x0F; BYTE $0xBD; BYTE $0xC5 /* BSRL RARG, AX */ XORL $31, AX RET