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Annotation of sys/lib/libkern/arch/amd64/strlen.S, Revision 1.1

1.1     ! nbrk        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:
        !             9: #if defined(LIBC_SCCS)
        !            10:        RCSID("$NetBSD: strlen.S,v 1.1 2001/06/19 00:22:47 fvdl Exp $")
        !            11: #endif
        !            12:
        !            13: ENTRY(strlen)
        !            14:        cld                             /* set search forward */
        !            15:        xorl    %eax,%eax               /* set search for null terminator */
        !            16:        movq    $-1,%rcx                /* set search for lots of characters */
        !            17:        repne                           /* search! */
        !            18:        scasb
        !            19:        notq    %rcx                    /* get length by taking complement */
        !            20:        leaq    -1(%rcx),%rax           /* and subtracting one */
        !            21:        ret