75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* Raise given exceptions.
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Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <float.h>
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#include <fpu_control.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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if (excepts == 0)
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return 0;
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/* Raise exceptions represented by EXPECTS. */
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if (excepts & FE_INEXACT)
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{
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double d = 1.0, x = 3.0;
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__asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x));
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}
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if (excepts & FE_UNDERFLOW)
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{
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long double d = LDBL_MIN, x = 10;
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__asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x));
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}
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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 %0, %0" : "+d" (d) : "d" (d));
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}
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if (excepts & FE_DIVBYZERO)
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{
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double d = 1.0, x = 0.0;
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__asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x));
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}
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if (excepts & FE_INVALID)
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{
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double d = HUGE_VAL, x = 0.0;
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__asm__ __volatile__ ("fmul %1, %0" : "+d" (d) : "d" (x));
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}
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{
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/* Restore flag fields. */
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fpu_control_t cw;
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_FPU_GETCW (cw);
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cw |= (excepts & FE_ALL_EXCEPT);
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_FPU_SETCW (cw);
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}
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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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