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 <math.h> |
22 | |
23 | int |
24 | __feraiseexcept (int excepts) |
25 | { |
26 | /* Raise exceptions represented by EXCEPTS. But we must raise only one |
27 | signal at a time. It is important that if the overflow/underflow |
28 | exception and the divide by zero exception are given at the same |
29 | time, the overflow/underflow exception follows the divide by zero |
30 | exception. */ |
31 | |
32 | /* First: invalid exception. */ |
33 | if (excepts & FE_INVALID) |
34 | { |
35 | /* One example of an invalid operation is 0 * Infinity. */ |
36 | double d = HUGE_VAL; |
37 | __asm__ __volatile__ ("fmul%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d)); |
38 | } |
39 | |
40 | /* Next: division by zero. */ |
41 | if (excepts & FE_DIVBYZERO) |
42 | { |
43 | double d = 1.0; |
44 | __asm__ __volatile__ ("fdiv%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d)); |
45 | } |
46 | |
47 | /* Next: overflow. */ |
48 | if (excepts & FE_OVERFLOW) |
49 | { |
50 | long double d = LDBL_MAX; |
51 | |
52 | __asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (d)); |
53 | } |
54 | |
55 | /* Next: underflow. */ |
56 | if (excepts & FE_UNDERFLOW) |
57 | { |
58 | long double d = -LDBL_MAX; |
59 | |
60 | __asm__ __volatile__ ("fetox%.x %0; fnop" : "=f" (d) : "0" (d)); |
61 | } |
62 | |
63 | /* Last: inexact. */ |
64 | if (excepts & FE_INEXACT) |
65 | { |
66 | long double d = 1.0; |
67 | __asm__ __volatile__ ("fdiv%.s %#0r3,%0; fnop" : "=f" (d) : "0" (d)); |
68 | } |
69 | |
70 | /* Success. */ |
71 | return 0; |
72 | } |
73 | |
74 | #include <shlib-compat.h> |
75 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
76 | strong_alias (__feraiseexcept, __old_feraiseexcept) |
77 | compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1); |
78 | #endif |
79 | |
80 | libm_hidden_def (__feraiseexcept) |
81 | libm_hidden_ver (__feraiseexcept, feraiseexcept) |
82 | versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2); |
83 | |