/* Raise given exceptions.   Copyright (C) 1997, 1998, 2000, 2001, 2002, 2007   Free Software Foundation, Inc.   This file is part of the GNU C Library.   Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000.   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 <fenv.h>#include <float.h>#include <math.h>#include <signal.h>#include <unistd.h>intferaiseexcept (int excepts){  double tmp;  double dummy;  /* Raise exceptions represented by EXPECTS.  But we must raise only     one signal at a time.  It is important the if the overflow/underflow     exception and the inexact exception are given at the same time,     the overflow/underflow exception precedes the inexact exception.  */  /* We do these bits in assembly to be certain GCC doesn't optimize     away something important.  */  /* First: invalid exception.  */  if (FE_INVALID & excepts)    {      /* One example of a invalid operation is 0 * Infinity.  */      tmp = 0;      __asm__ __volatile__ ("frcpa.s0 %0,p1=f0,f0" : "=f" (tmp) : : "p1" );    }  /* Next: division by zero.  */  if (FE_DIVBYZERO & excepts)    __asm__ __volatile__ ("frcpa.s0 %0,p1=f1,f0" : "=f" (tmp) : : "p1" );  /* Next: overflow.  */  if (FE_OVERFLOW & excepts)    {      dummy = DBL_MAX;      __asm__ __volatile__ ("fadd.d.s0 %0=%1,%1" : "=f" (dummy) : "0" (dummy));    }  /* Next: underflow.  */  if (FE_UNDERFLOW & excepts)    {      dummy = DBL_MIN;      __asm__ __volatile__ ("fnma.d.s0 %0=%1,%1,f0" : "=f" (tmp) : "f" (dummy));  }  /* Last: inexact.  */  if (FE_INEXACT & excepts)    {      dummy = DBL_MAX;      __asm__ __volatile__ ("fsub.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy));    }  /* Success.  */  return 0;}libm_hidden_def (feraiseexcept)