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83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/* Raise given exceptions.
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Copyright (C) 1997-2014 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 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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int
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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 an invalid operation is 0 * Infinity. */
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double d = HUGE_VAL;
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__asm__ __volatile__ ("fmul%.s %#0r0,%0; fnop" : "=f" (d) : "0" (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;
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__asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (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_MAX;
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__asm__ __volatile__ ("fetox%.x %0; fnop" : "=f" (d) : "0" (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 d = 1.0;
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__asm__ __volatile__ ("fdiv%.s %#0r3,%0; fnop" : "=f" (d) : "0" (d));
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}
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/* Success. */
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return 0;
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}
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
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strong_alias (__feraiseexcept, __old_feraiseexcept)
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compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
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#endif
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libm_hidden_ver (__feraiseexcept, feraiseexcept)
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versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);
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