1/* 2 * Written by J.T. Conklin <jtc@netbsd.org>. 3 * Public domain. 4 * Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl@wasabisystems.com> 5 */ 6 7#include <machine/asm.h> 8 9ENTRY(strlen) 10 cld /* set search forward */ 11 xorl %eax,%eax /* set search for null terminator */ 12 movq $-1,%rcx /* set search for lots of characters */ 13 repne /* search! */ 14 scasb 15 notq %rcx /* get length by taking complement */ 16 leaq -1(%rcx),%rax /* and subtracting one */ 17 ret 18