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/* Raise given exceptions.
Copyright (C) 2022-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <fenv.h>
#include <fpu_control.h>
#include <float.h>
int
__feraiseexcept (int excepts)
{
const float fp_zero = 0.0f;
const float fp_one = 1.0f;
const float fp_max = FLT_MAX;
const float fp_min = FLT_MIN;
const float fp_1e32 = 1.0e32f;
const float fp_two = 2.0f;
const float fp_three = 3.0f;
/* Raise exceptions represented by EXPECTS. But we must raise only
one signal at a time. It is important that if the overflow/underflow
exception and the inexact exception are given at the same time,
the overflow/underflow exception follows the inexact exception. */
/* First: invalid exception. */
if (FE_INVALID & excepts)
__asm__ __volatile__("fdiv.s $f0,%0,%0\n\t"
:
: "f"(fp_zero)
: "$f0");
/* Next: division by zero. */
if (FE_DIVBYZERO & excepts)
__asm__ __volatile__("fdiv.s $f0,%0,%1\n\t"
:
: "f"(fp_one), "f"(fp_zero)
: "$f0");
/* Next: overflow. */
if (FE_OVERFLOW & excepts)
/* There's no way to raise overflow without also raising inexact. */
__asm__ __volatile__("fadd.s $f0,%0,%1\n\t"
:
: "f"(fp_max), "f"(fp_1e32)
: "$f0");
/* Next: underflow. */
if (FE_UNDERFLOW & excepts)
__asm__ __volatile__("fdiv.s $f0,%0,%1\n\t"
:
: "f"(fp_min), "f"(fp_three)
: "$f0");
/* Last: inexact. */
if (FE_INEXACT & excepts)
__asm__ __volatile__("fdiv.s $f0, %0, %1\n\t"
:
: "f"(fp_two), "f"(fp_three)
: "$f0");
/* Success. */
return 0;
}
libm_hidden_def (__feraiseexcept) weak_alias (__feraiseexcept, feraiseexcept)
libm_hidden_weak (feraiseexcept)
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