sysdeps/s390/s390-32/memchr.S

   1 /* Search a character in a block of memory.  For IBM S390
   2    Copyright (C) 2000-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 /*
  21  * R2 = address to memory area
  22  * R3 = character to find
  23  * R4 = number of bytes to search
  24  */
  25
  26 #include "sysdep.h"
  27 #include "asm-syntax.h"
  28
  29         .text
  30 ENTRY(memchr)
  31         lhi   %r0,0xff
  32         nr    %r0,%r3
  33         lr    %r1,%r2
  34         la    %r2,0(%r4,%r1)
  35 0:      srst  %r2,%r1
  36         jo    0b
  37         brc   13,1f
  38         slr   %r2,%r2
  39 1:      br    %r14
  40 END(memchr)
  41 libc_hidden_builtin_def (memchr)