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75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
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/* Raise given exceptions.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <fenv.h>
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#include <math.h>
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void
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feraiseexcept (int excepts)
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{
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/* Raise exceptions represented by EXCEPTS. But we must raise only one
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signal at a time. It is important that if the overflow/underflow
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exception and the divide by zero exception are given at the same
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time, the overflow/underflow exception follows the divide by zero
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exception. */
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/* First: invalid exception. */
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if (excepts & FE_INVALID)
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{
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/* One example of a invalid operation is 0 * Infinity. */
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double d = 0.0 * HUGE_VAL;
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/* Now force the exception. */
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__asm__ __volatile__ ("fnop" : : "f" (d));
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}
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/* Next: division by zero. */
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if (excepts & FE_DIVBYZERO)
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{
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double d = 1.0;
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__asm__ __volatile__ ("fdiv%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d));
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}
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/* Next: overflow. */
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if (excepts & FE_OVERFLOW)
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{
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long double d = LDBL_MAX * LDBL_MAX;
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/* Now force the exception. */
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__asm__ __volatile__ ("fnop" : : "f" (d));
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}
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/* Next: underflow. */
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if (excepts & FE_UNDERFLOW)
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{
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long double d = LDBL_MIN / 16.0;
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/* Now force the exception. */
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__asm__ __volatile__ ("fnop" : : "f" (d));
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}
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/* Last: inexact. */
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if (excepts & FE_INEXACT)
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{
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long double d1, d2 = 1.0;
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__asm__ __volatile__ ("fmovecr %#0,%0\n\t"
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"fdiv%.x %1,%0\n\t"
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"fnop"
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: "=&f" (d1) : "f" (d2));
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}
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}
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