1 | /* Raise given exceptions. |
2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <fenv.h> |
20 | #include <float.h> |
21 | #include <fpu_control.h> |
22 | #include <math.h> |
23 | |
24 | int |
25 | __feraiseexcept (int excepts) |
26 | { |
27 | if (excepts == 0) |
28 | return 0; |
29 | |
30 | /* Raise exceptions represented by EXPECTS. */ |
31 | |
32 | if (excepts & FE_INEXACT) |
33 | { |
34 | double d = 1.0, x = 3.0; |
35 | __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x)); |
36 | } |
37 | |
38 | if (excepts & FE_UNDERFLOW) |
39 | { |
40 | long double d = LDBL_MIN, x = 10; |
41 | __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x)); |
42 | } |
43 | |
44 | if (excepts & FE_OVERFLOW) |
45 | { |
46 | long double d = LDBL_MAX; |
47 | __asm__ __volatile__ ("fmul %0, %0" : "+d" (d) : "d" (d)); |
48 | } |
49 | |
50 | if (excepts & FE_DIVBYZERO) |
51 | { |
52 | double d = 1.0, x = 0.0; |
53 | __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x)); |
54 | } |
55 | |
56 | if (excepts & FE_INVALID) |
57 | { |
58 | double d = HUGE_VAL, x = 0.0; |
59 | __asm__ __volatile__ ("fmul %1, %0" : "+d" (d) : "d" (x)); |
60 | } |
61 | |
62 | { |
63 | /* Restore flag fields. */ |
64 | fpu_control_t cw; |
65 | _FPU_GETCW (cw); |
66 | cw |= (excepts & FE_ALL_EXCEPT); |
67 | _FPU_SETCW (cw); |
68 | } |
69 | |
70 | return 0; |
71 | } |
72 | libm_hidden_def (__feraiseexcept) |
73 | weak_alias (__feraiseexcept, feraiseexcept) |
74 | libm_hidden_weak (feraiseexcept) |
75 | |