lib/libc/amd64/string/bcmp.S

   1 #include <machine/asm.h>
   2 __FBSDID("$FreeBSD$");
   3
   4 #if 0
   5         RCSID("$NetBSD: bcmp.S,v 1.1 2001/06/19 00:25:04 fvdl Exp $")
   6 #endif
   7
   8 ENTRY(bcmp)
   9         cld                             /* set compare direction forward */
  10
  11         movq    %rdx,%rcx               /* compare by words */
  12         shrq    $3,%rcx
  13         repe
  14         cmpsq
  15         jne     L1
  16
  17         movq    %rdx,%rcx               /* compare remainder by bytes */
  18         andq    $7,%rcx
  19         repe
  20         cmpsb
  21 L1:
  22         setne   %al
  23         movsbl  %al,%eax
  24         ret
  25 END(bcmp)
  26
  27         .section .note.GNU-stack,"",%progbits