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81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/* Raise given exceptions.
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Copyright (C) 1997-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <float.h>
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#include <math.h>
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#include <signal.h>
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#include <unistd.h>
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int
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__feraiseexcept (int excepts)
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{
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double tmp;
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double dummy;
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/* Raise exceptions represented by EXPECTS. But we must raise only
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one signal at a time. It is important the if the overflow/underflow
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exception and the inexact exception are given at the same time,
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the overflow/underflow exception precedes the inexact exception. */
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/* We do these bits in assembly to be certain GCC doesn't optimize
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away something important. */
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/* First: invalid exception. */
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if (FE_INVALID & excepts)
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{
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/* One example of an invalid operation is 0 * Infinity. */
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tmp = 0;
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__asm__ __volatile__ ("frcpa.s0 %0,p1=f0,f0" : "=f" (tmp) : : "p1" );
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}
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/* Next: division by zero. */
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if (FE_DIVBYZERO & excepts)
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__asm__ __volatile__ ("frcpa.s0 %0,p1=f1,f0" : "=f" (tmp) : : "p1" );
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/* Next: overflow. */
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if (FE_OVERFLOW & excepts)
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{
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dummy = DBL_MAX;
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__asm__ __volatile__ ("fadd.d.s0 %0=%1,%1" : "=f" (dummy) : "0" (dummy));
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}
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/* Next: underflow. */
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if (FE_UNDERFLOW & excepts)
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{
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dummy = DBL_MIN;
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__asm__ __volatile__ ("fnma.d.s0 %0=%1,%1,f0" : "=f" (tmp) : "f" (dummy));
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}
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/* Last: inexact. */
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if (FE_INEXACT & excepts)
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{
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dummy = DBL_MAX;
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__asm__ __volatile__ ("fsub.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy));
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}
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/* Success. */
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return 0;
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}
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libm_hidden_def (__feraiseexcept)
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weak_alias (__feraiseexcept, feraiseexcept)
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libm_hidden_weak (feraiseexcept)
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