ports/sysdeps/m68k/m680x0/fpu/s_remquo.c

   1 /* Compute remainder and a congruent to the quotient.  m68k fpu version
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
   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 #include <math.h>
  21
  22 #ifndef SUFF
  23 #define SUFF
  24 #endif
  25 #ifndef float_type
  26 #define float_type double
  27 #endif
  28
  29 #define CONCATX(a,b) __CONCAT(a,b)
  30 #define s(name) CONCATX(name,SUFF)
  31
  32 float_type
  33 s(__remquo) (float_type x, float_type y, int *quo)
  34 {
  35   float_type result;
  36   int cquo, fpsr;
  37
  38   __asm ("frem%.x %2,%0\n\tfmove%.l %/fpsr,%1"
  39          : "=f" (result), "=dm" (fpsr) : "f" (y), "0" (x));
  40   cquo = (fpsr >> 16) & 0x7f;
  41   if (fpsr & (1 << 23))
  42     cquo = -cquo;
  43   *quo = cquo;
  44   return result;
  45 }
  46 weak_alias (s(__remquo), s(remquo))