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) 2001-2018 Free Software Foundation, Inc.
   4    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the 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    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 /* INPUT PARAMETERS
  21      %r2 = address of string 1
  22      %r3 = address of string 2.  */
  23
  24 #include <ifunc-strcmp.h>
  25 #include "sysdep.h"
  26 #include "asm-syntax.h"
  27
  28 #if HAVE_STRCMP_Z900_G5
  29 # if defined __s390x__
  30 #  define SLGR  slgr
  31 #  define LGHI  lghi
  32 # else
  33 #  define SLGR  slr
  34 #  define LGHI  lhi
  35 # endif /* ! defined __s390x__  */
  36
  37         .text
  38 ENTRY(STRCMP_Z900_G5)
  39         SLGR   %r0,%r0
  40 0:      clst  %r2,%r3
  41         jo    0b
  42         jp    1f
  43         jm    2f
  44         SLGR  %r2,%r2
  45         br    %r14
  46 1:      LGHI  %r2,1
  47         br    %r14
  48 2:      LGHI  %r2,-1
  49         br    %r14
  50 END(STRCMP_Z900_G5)
  51
  52 # if ! HAVE_STRCMP_IFUNC
  53 strong_alias (STRCMP_Z900_G5, strcmp)
  54 # endif
  55
  56 # if defined SHARED && IS_IN (libc)
  57 strong_alias (STRCMP_Z900_G5, __GI_strcmp)
  58 # endif
  59 #endif