1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
/* Software floating-point emulation.
Helper routine for _Q_* routines.
Simulate exceptions using double arithmetics.
Copyright (C) 1999-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek (jj@ultra.linux.cz).
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
<http://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));
}
}
|
