sysdeps/s390/strcmp-z900.S

   1 /* strcmp - compare two string.  64 bit S/390 version.
   2    This file is part of the GNU C Library.
   3    Copyright (C) 2001-2022 Free Software Foundation, Inc.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* INPUT PARAMETERS
  20      %r2 = address of string 1
  21      %r3 = address of string 2.  */
  22
  23 #include <ifunc-strcmp.h>
  24 #include "sysdep.h"
  25 #include "asm-syntax.h"
  26
  27 #if HAVE_STRCMP_Z900_G5
  28 # if defined __s390x__
  29 #  define SLGR  slgr
  30 #  define LGHI  lghi
  31 # else
  32 #  define SLGR  slr
  33 #  define LGHI  lhi
  34 # endif /* ! defined __s390x__  */
  35
  36         .text
  37 ENTRY(STRCMP_Z900_G5)
  38         SLGR   %r0,%r0
  39 0:      clst  %r2,%r3
  40         jo    0b
  41         jp    1f
  42         jm    2f
  43         SLGR  %r2,%r2
  44         br    %r14
  45 1:      LGHI  %r2,1
  46         br    %r14
  47 2:      LGHI  %r2,-1
  48         br    %r14
  49 END(STRCMP_Z900_G5)
  50
  51 # if ! HAVE_STRCMP_IFUNC
  52 strong_alias (STRCMP_Z900_G5, strcmp)
  53 # endif
  54
  55 # if defined SHARED && IS_IN (libc)
  56 strong_alias (STRCMP_Z900_G5, __GI_strcmp)
  57 # endif
  58 #endif