sysdeps/alpha/stpcpy.S

   1 /* Copyright (C) 1996 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson (rth@tamu.edu)
   3
   4 This file is part of the GNU C Library.
   5
   6 The GNU C Library is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU Library General Public License as
   8 published by the Free Software Foundation; either version 2 of the
   9 License, or (at your option) any later version.
  10
  11 The GNU C Library is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 Library General Public License for more details.
  15
  16 You should have received a copy of the GNU Library General Public
  17 License along with the GNU C Library; see the file COPYING.LIB.  If
  18 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  19 Cambridge, MA 02139, USA.  */
  20
  21 /* Copy a null-terminated string from SRC to DST.  Return a pointer
  22    to the null-terminator in the source.  */
  23
  24 #include <sysdep.h>
  25
  26         .text
  27
  28 ENTRY(__stpcpy)
  29         ldgp    gp, 0(pv)
  30         .prologue 1
  31
  32         jsr     t9, __stxcpy    # do the work of the copy
  33
  34         and     t8, 0xf0, t2    # binary search for byte offset of the
  35         and     t8, 0xcc, t1    # last byte written.
  36         and     t8, 0xaa, t0
  37         andnot  a0, 7, a0
  38         cmovne  t2, 4, t2
  39         cmovne  t1, 2, t1
  40         cmovne  t0, 1, t0
  41         addq    a0, t2, v0
  42         addq    t0, t1, t0
  43         addq    v0, t0, v0
  44
  45         ret
  46
  47         END(__stpcpy)
  48
  49 weak_alias (__stpcpy, stpcpy)