81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
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/* Raise given exceptions.
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Copyright (C) 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 <fpu_control.h>
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#include <float.h>
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int
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__feraiseexcept (int excepts)
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{
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const float fp_zero = 0.0f;
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const float fp_one = 1.0f;
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const float fp_max = FLT_MAX;
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const float fp_min = FLT_MIN;
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const float fp_1e32 = 1.0e32f;
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const float fp_two = 2.0f;
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const float fp_three = 3.0f;
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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 that 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 follows the inexact exception. */
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/* First: invalid exception. */
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if (FE_INVALID & excepts)
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__asm__ __volatile__("fdiv.s $f0,%0,%0\n\t"
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:
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: "f"(fp_zero)
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: "$f0");
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/* Next: division by zero. */
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if (FE_DIVBYZERO & excepts)
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__asm__ __volatile__("fdiv.s $f0,%0,%1\n\t"
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:
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: "f"(fp_one), "f"(fp_zero)
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: "$f0");
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/* Next: overflow. */
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if (FE_OVERFLOW & excepts)
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/* There's no way to raise overflow without also raising inexact. */
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__asm__ __volatile__("fadd.s $f0,%0,%1\n\t"
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:
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: "f"(fp_max), "f"(fp_1e32)
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: "$f0");
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/* Next: underflow. */
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if (FE_UNDERFLOW & excepts)
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__asm__ __volatile__("fdiv.s $f0,%0,%1\n\t"
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:
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: "f"(fp_min), "f"(fp_three)
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: "$f0");
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/* Last: inexact. */
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if (FE_INEXACT & excepts)
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__asm__ __volatile__("fdiv.s $f0, %0, %1\n\t"
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:
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: "f"(fp_two), "f"(fp_three)
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: "$f0");
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/* Success. */
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return 0;
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}
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libm_hidden_def (__feraiseexcept) weak_alias (__feraiseexcept, feraiseexcept)
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libm_hidden_weak (feraiseexcept)
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