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3846ef75 | 1 | /* Raise given exceptions. |
2b778ceb | 2 | Copyright (C) 1997-2021 Free Software Foundation, Inc. |
3846ef75 | 3 | This file is part of the GNU C Library. |
8a53f50f | 4 | Contributed by Nobuhiro Iwamatsu <iwamatsu@nigauri.org>, 2012. |
3846ef75 UD |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
3846ef75 UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
3846ef75 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
3846ef75 UD |
19 | |
20 | #include <fenv.h> | |
8a53f50f | 21 | #include <float.h> |
3846ef75 UD |
22 | #include <fpu_control.h> |
23 | #include <math.h> | |
24 | ||
25 | int | |
0747f818 | 26 | __feraiseexcept (int excepts) |
3846ef75 | 27 | { |
8a53f50f KK |
28 | if (excepts == 0) |
29 | return 0; | |
30 | ||
3846ef75 | 31 | /* Raise exceptions represented by EXPECTS. */ |
8a53f50f KK |
32 | |
33 | if (excepts & FE_INEXACT) | |
34 | { | |
35 | double d = 1.0, x = 3.0; | |
36 | __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x)); | |
37 | } | |
38 | ||
39 | if (excepts & FE_UNDERFLOW) | |
40 | { | |
41 | long double d = LDBL_MIN, x = 10; | |
42 | __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x)); | |
43 | } | |
44 | ||
45 | if (excepts & FE_OVERFLOW) | |
46 | { | |
47 | long double d = LDBL_MAX; | |
48 | __asm__ __volatile__ ("fmul %0, %0" : "+d" (d) : "d" (d)); | |
49 | } | |
50 | ||
51 | if (excepts & FE_DIVBYZERO) | |
52 | { | |
53 | double d = 1.0, x = 0.0; | |
54 | __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x)); | |
55 | } | |
56 | ||
57 | if (excepts & FE_INVALID) | |
58 | { | |
59 | double d = HUGE_VAL, x = 0.0; | |
60 | __asm__ __volatile__ ("fmul %1, %0" : "+d" (d) : "d" (x)); | |
61 | } | |
3846ef75 | 62 | |
3f99608f KK |
63 | { |
64 | /* Restore flag fields. */ | |
65 | fpu_control_t cw; | |
66 | _FPU_GETCW (cw); | |
67 | cw |= (excepts & FE_ALL_EXCEPT); | |
68 | _FPU_SETCW (cw); | |
69 | } | |
70 | ||
3846ef75 UD |
71 | return 0; |
72 | } | |
0747f818 JM |
73 | libm_hidden_def (__feraiseexcept) |
74 | weak_alias (__feraiseexcept, feraiseexcept) | |
75 | libm_hidden_weak (feraiseexcept) |