ref: 8e5d5789171e00a9208fea587c81e7322281bbc0 dir: /builtins_plan9_amd64.s/
TEXT __builtin_clz(SB),1,$0 BYTE $0x0F; BYTE $0xBD; BYTE $0xC5 /* BSRL RARG, AX */ XORL $31, AX RET