1/* Software floating-point emulation.
2 Helper routine for _Qp_* routines.
3 Simulate exceptions using double arithmetics.
4 Copyright (C) 1999-2024 Free Software Foundation, Inc.
5 This file is part of the GNU C Library.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <https://www.gnu.org/licenses/>. */
20
21#include <float.h>
22#include <math.h>
23#include <assert.h>
24#include "soft-fp.h"
25
26void __Qp_handle_exceptions(int exceptions)
27{
28 if (exceptions & FP_EX_INVALID)
29 {
30 float f = 0.0;
31 __asm__ __volatile__ ("fdivs %0, %0, %0" : "+f" (f));
32 }
33 if (exceptions & FP_EX_DIVZERO)
34 {
35 float f = 1.0, g = 0.0;
36 __asm__ __volatile__ ("fdivs %0, %1, %0"
37 : "+f" (f)
38 : "f" (g));
39 }
40 if (exceptions & FP_EX_OVERFLOW)
41 {
42 float f = FLT_MAX;
43 __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));
44 exceptions &= ~FP_EX_INEXACT;
45 }
46 if (exceptions & FP_EX_UNDERFLOW)
47 {
48 float f = FLT_MIN;
49 __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f));
50 exceptions &= ~FP_EX_INEXACT;
51 }
52 if (exceptions & FP_EX_INEXACT)
53 {
54 double d = 1.0, e = M_PI;
55 __asm__ __volatile__ ("fdivd %0, %1, %0"
56 : "+f" (d)
57 : "f" (e));
58 }
59}
60

source code of glibc/sysdeps/sparc/sparc64/qp_util.c