Subversion Repositories openrisc

/* Compute remainder and a congruent to the quotient.

   Copyright (C) 1997, 1999, 2002 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and

                  Jakub Jelinek <jj@ultra.linux.cz>, 1999.

   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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include "quadmath-imp.h"

static const __float128 zero = 0.0;

__float128

remquoq (__float128 x, __float128 y, int *quo)

{

  int64_t hx,hy;

  uint64_t sx,lx,ly,qs;

  int cquo;

  GET_FLT128_WORDS64 (hx, lx, x);

  GET_FLT128_WORDS64 (hy, ly, y);

  sx = hx & 0x8000000000000000ULL;

  qs = sx ^ (hy & 0x8000000000000000ULL);

  hy &= 0x7fffffffffffffffLL;

  hx &= 0x7fffffffffffffffLL;

  /* Purge off exception values.  */

  if ((hy | ly) == 0)

    return (x * y) / (x * y);                   /* y = 0 */

  if ((hx >= 0x7fff000000000000LL)              /* x not finite */

      || ((hy >= 0x7fff000000000000LL)          /* y is NaN */

          && (((hy - 0x7fff000000000000LL) | ly) != 0)))

    return (x * y) / (x * y);

  if (hy <= 0x7ffbffffffffffffLL)

    x = fmodq (x, 8 * y);              /* now x < 8y */

  if (((hx - hy) | (lx - ly)) == 0)

    {

      *quo = qs ? -1 : 1;

      return zero * x;

    }

  x  = fabsq (x);

  y  = fabsq (y);

  cquo = 0;

  if (x >= 4 * y)

    {

      x -= 4 * y;

      cquo += 4;

    }

  if (x >= 2 * y)

    {

      x -= 2 * y;

      cquo += 2;

    }

  if (hy < 0x0002000000000000LL)

    {

      if (x + x > y)

        {

          x -= y;

          ++cquo;

          if (x + x >= y)

            {

              x -= y;

              ++cquo;

            }

        }

    }

  else

    {

      __float128 y_half = 0.5Q * y;

      if (x > y_half)

        {

          x -= y;

          ++cquo;

          if (x >= y_half)

            {

              x -= y;

              ++cquo;

            }

        }

    }

  *quo = qs ? -cquo : cquo;

  if (sx)

    x = -x;

  return x;

}