shithub: dav1d

ref: 2e3fd4d6c9fe649a032218093e50e55577528dde
dir: /src/plan9_builtins_amd64.s/

View raw version 
TEXT __builtin_ctz(SB),1,$0
	BYTE $0x0F; BYTE $0xBC; BYTE $0xC5 /* BSFL RARG, AX */
	RET

TEXT __builtin_clz(SB),1,$0
	BYTE $0x0F; BYTE $0xBD; BYTE $0xC5 /* BSRL RARG, AX */
	XORL $31, AX
	RET

TEXT __builtin_clzll(SB),1,$0
	BYTE $0x48; BYTE $0x0F; BYTE $0xBD; BYTE $0xC5 /* BSRQ RARG, AX */
	XORL $63, AX
	RET