sfp-exceptions.c revision 1.9 
1/*
2 * Copyright (C) 2012-2020 Free Software Foundation, Inc.
3 *
4 * This file is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 3, or (at your option) any
7 * later version.
8 *
9 * This file is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * General Public License for more details.
13 *
14 * Under Section 7 of GPL version 3, you are granted additional
15 * permissions described in the GCC Runtime Library Exception, version
16 * 3.1, as published by the Free Software Foundation.
17 *
18 * You should have received a copy of the GNU General Public License and
19 * a copy of the GCC Runtime Library Exception along with this program;
20 * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
21 * <http://www.gnu.org/licenses/>.
22 */
23
24#include "sfp-machine.h"
25
26void
27__sfp_handle_exceptions (int _fex)
28{
29  const float fp_max = __FLT_MAX__;
30  const float fp_min = __FLT_MIN__;
31  const float fp_1e32 = 1.0e32f;
32  const float fp_zero = 0.0;
33  const float fp_one = 1.0;
34  unsigned fpsr;
35
36  if (_fex & FP_EX_INVALID)
37    {
38      __asm__ __volatile__ ("fdiv\ts0, %s0, %s0"
39			    :
40			    : "w" (fp_zero)
41			    : "s0");
42      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
43    }
44  if (_fex & FP_EX_DIVZERO)
45    {
46      __asm__ __volatile__ ("fdiv\ts0, %s0, %s1"
47			    :
48			    : "w" (fp_one), "w" (fp_zero)
49			    : "s0");
50      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
51    }
52  if (_fex & FP_EX_OVERFLOW)
53    {
54      __asm__ __volatile__ ("fadd\ts0, %s0, %s1"
55			    :
56			    : "w" (fp_max), "w" (fp_1e32)
57			    : "s0");
58      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
59    }
60  if (_fex & FP_EX_UNDERFLOW)
61    {
62      __asm__ __volatile__ ("fmul\ts0, %s0, %s0"
63			    :
64			    : "w" (fp_min)
65			    : "s0");
66      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
67    }
68  if (_fex & FP_EX_INEXACT)
69    {
70      __asm__ __volatile__ ("fsub\ts0, %s0, %s1"
71			    :
72			    : "w" (fp_max), "w" (fp_one)
73			    : "s0");
74      __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
75    }
76}
77