/* Software floating-point emulation.

   Helper routine for _Q_* routines.

   Simulate exceptions using double arithmetics.

   Copyright (C) 1999-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Jakub Jelinek (jj@ultra.linux.cz).

   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 <float.h>

#include <math.h>

#include <assert.h>

#include "soft-fp.h"

unsigned long long ___Q_zero = 0x0000000000000000ULL;

void ___Q_simulate_exceptions(int exceptions)

{

  if (exceptions & FP_EX_INVALID)

    {

      float f = 0.0;

      __asm__ __volatile__ ("fdivs %0, %0, %0" : "+f" (f));

    }

  if (exceptions & FP_EX_DIVZERO)

    {

      float f = 1.0, g = 0.0;

      __asm__ __volatile__ ("fdivs %0, %1, %0"

			    : "+f" (f)

			    : "f" (g));

    }

  if (exceptions & FP_EX_OVERFLOW)

    {

      float f = FLT_MAX;

      __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));

      exceptions &= ~FP_EX_INEXACT;

    }

  if (exceptions & FP_EX_UNDERFLOW)

    {

      float f = FLT_MIN;

      __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));

      exceptions &= ~FP_EX_INEXACT;

    }

  if (exceptions & FP_EX_INEXACT)

    {

      double d = 1.0, e = M_PI;

      __asm__ __volatile__ ("fdivd %0, %1, %0"

			    : "+f" (d)

			    : "f" (e));

    }

}