scc

 1	.file 	"memchr.s"
 2
 3	.text
 4	.globl	memchr,_memchr
 5_memchr:
 6memchr:
 7	cmpq	$0,%rdx
 8	je	notfound
 9
10	movq	%rdx,%rcx
11	movb	%sil,%al
12	cld
13	repne
14	scasb
15	je 	found
16
17notfound:
18	xor	%eax,%eax
19	ret
20
21found:
22	leaq	-1(%rdi),%rax
23	ret