1 | /* Software floating-point emulation. |
2 | Helper routine for _Q_* 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 | |
26 | unsigned long long ___Q_zero = 0x0000000000000000ULL; |
27 | |
28 | void ___Q_simulate_exceptions(int exceptions) |
29 | { |
30 | if (exceptions & FP_EX_INVALID) |
31 | { |
32 | float f = 0.0; |
33 | __asm__ __volatile__ ("fdivs %0, %0, %0" : "+f" (f)); |
34 | } |
35 | if (exceptions & FP_EX_DIVZERO) |
36 | { |
37 | float f = 1.0, g = 0.0; |
38 | __asm__ __volatile__ ("fdivs %0, %1, %0" |
39 | : "+f" (f) |
40 | : "f" (g)); |
41 | } |
42 | if (exceptions & FP_EX_OVERFLOW) |
43 | { |
44 | float f = FLT_MAX; |
45 | __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f)); |
46 | exceptions &= ~FP_EX_INEXACT; |
47 | } |
48 | if (exceptions & FP_EX_UNDERFLOW) |
49 | { |
50 | float f = FLT_MIN; |
51 | __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f)); |
52 | exceptions &= ~FP_EX_INEXACT; |
53 | } |
54 | if (exceptions & FP_EX_INEXACT) |
55 | { |
56 | double d = 1.0, e = M_PI; |
57 | __asm__ __volatile__ ("fdivd %0, %1, %0" |
58 | : "+f" (d) |
59 | : "f" (e)); |
60 | } |
61 | } |
62 | |