62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* Software floating-point emulation.
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Helper routine for _Q_* routines.
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Simulate exceptions using double arithmetics.
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Copyright (C) 1999-2022 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 <float.h>
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#include <math.h>
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#include <assert.h>
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#include "soft-fp.h"
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unsigned long long ___Q_zero = 0x0000000000000000ULL;
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void ___Q_simulate_exceptions(int exceptions)
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{
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if (exceptions & FP_EX_INVALID)
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{
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float f = 0.0;
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__asm__ __volatile__ ("fdivs %0, %0, %0" : "+f" (f));
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}
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if (exceptions & FP_EX_DIVZERO)
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{
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float f = 1.0, g = 0.0;
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__asm__ __volatile__ ("fdivs %0, %1, %0"
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: "+f" (f)
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: "f" (g));
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}
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if (exceptions & FP_EX_OVERFLOW)
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{
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float f = FLT_MAX;
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__asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));
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exceptions &= ~FP_EX_INEXACT;
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}
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if (exceptions & FP_EX_UNDERFLOW)
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{
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float f = FLT_MIN;
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__asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));
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exceptions &= ~FP_EX_INEXACT;
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}
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if (exceptions & FP_EX_INEXACT)
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{
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double d = 1.0, e = M_PI;
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__asm__ __volatile__ ("fdivd %0, %1, %0"
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: "+f" (d)
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: "f" (e));
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}
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}
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