mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* Software floating-point emulation.
|
|
Helper routine for _Q_* routines.
|
|
Simulate exceptions using double arithmetics.
|
|
Copyright (C) 1999-2024 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 <float.h>
|
|
#include <math.h>
|
|
#include <assert.h>
|
|
#include "soft-fp.h"
|
|
|
|
unsigned long long ___Q_zero = 0x0000000000000000ULL;
|
|
|
|
void ___Q_simulate_exceptions(int exceptions)
|
|
{
|
|
if (exceptions & FP_EX_INVALID)
|
|
{
|
|
float f = 0.0;
|
|
__asm__ __volatile__ ("fdivs %0, %0, %0" : "+f" (f));
|
|
}
|
|
if (exceptions & FP_EX_DIVZERO)
|
|
{
|
|
float f = 1.0, g = 0.0;
|
|
__asm__ __volatile__ ("fdivs %0, %1, %0"
|
|
: "+f" (f)
|
|
: "f" (g));
|
|
}
|
|
if (exceptions & FP_EX_OVERFLOW)
|
|
{
|
|
float f = FLT_MAX;
|
|
__asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));
|
|
exceptions &= ~FP_EX_INEXACT;
|
|
}
|
|
if (exceptions & FP_EX_UNDERFLOW)
|
|
{
|
|
float f = FLT_MIN;
|
|
__asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));
|
|
exceptions &= ~FP_EX_INEXACT;
|
|
}
|
|
if (exceptions & FP_EX_INEXACT)
|
|
{
|
|
double d = 1.0, e = M_PI;
|
|
__asm__ __volatile__ ("fdivd %0, %1, %0"
|
|
: "+f" (d)
|
|
: "f" (e));
|
|
}
|
|
}
|