73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/* 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 Richard Henderson <rth@tamu.edu>, 1997.
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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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double tmp;
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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 a invalid operation is 0 * Infinity. */
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__asm__ __volatile__("mult/sui $f31,%1,%0; trapb"
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: "=f"(tmp) : "f"(HUGE_VAL));
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}
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/* Next: division by zero. */
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if (FE_DIVBYZERO & excepts)
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{
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__asm__ __volatile__("cmpteq $f31,$f31,%0; divt/sui %0,$f31,%0; trapb"
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: "=f"(tmp));
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}
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/* Next: overflow. */
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if (FE_OVERFLOW & excepts)
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{
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__asm__ __volatile__("mult/sui %1,%1,%0; trapb"
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: "=f"(tmp) : "f"(DBL_MAX));
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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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__asm__ __volatile__("divt/sui %1,%2,%0; trapb"
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: "=f"(tmp) : "f"(DBL_MIN), "f"(16.0));
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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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__asm__ __volatile__("divt/sui %1,%2,%0; trapb"
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: "=f"(tmp) : "f"(1.0), "f"(M_PI));
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}
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}
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