text: /* ffs -- find first set bit in a word, counted from least significant end.
     S/390 version.
     Copyright (C) 2000-2016 Free Software Foundation, Inc.
     Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <http://www.gnu.org/licenses/>.  */
  
  #include <limits.h>
  #define ffsl __something_else
  #include <string.h>
  
  #undef	ffs
  
  /* ffs: find first bit set. This is defined the same way as
     the libc and compiler builtin ffs routines, therefore
     differs in spirit from the above ffz (man ffs).  */
  
  int
  __ffs (int x)
  {
  	int r;
  
  	if (x == 0)
  	  return 0;
  	__asm__("    lr	  %%r1,%1\n"
  		"    sr	  %0,%0\n"
  		"    tml  %%r1,0xFFFF\n"
  		"    jnz  0f\n"
  		"    ahi  %0,16\n"
  		"    srl  %%r1,16\n"
  		"0:  tml  %%r1,0x00FF\n"
  		"    jnz  1f\n"
  		"    ahi  %0,8\n"
  		"    srl  %%r1,8\n"
  		"1:  tml  %%r1,0x000F\n"
  		"    jnz  2f\n"
  		"    ahi  %0,4\n"
  		"    srl  %%r1,4\n"
  		"2:  tml  %%r1,0x0003\n"
  		"    jnz  3f\n"
  		"    ahi  %0,2\n"
  		"    srl  %%r1,2\n"
  		"3:  tml  %%r1,0x0001\n"
  		"    jnz  4f\n"
  		"    ahi  %0,1\n"
  		"4:"
  		: "=&d" (r) : "d" (x) : "cc", "1" );
  	return r+1;
  }
  
  weak_alias (__ffs, ffs)
  libc_hidden_def (__ffs)
  libc_hidden_builtin_def (ffs)
  #if ULONG_MAX == UINT_MAX
  #undef ffsl
  weak_alias (__ffs, ffsl)
  #endif
  