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5146356f | 1 | /* Test fesetexcept: exception traps enabled. |
dff8da6b | 2 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
5146356f JM |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
5146356f JM |
18 | |
19 | #include <fenv.h> | |
20 | #include <stdio.h> | |
21 | #include <math-tests.h> | |
47a9eeb9 | 22 | #include <math-barriers.h> |
5146356f JM |
23 | |
24 | static int | |
25 | do_test (void) | |
26 | { | |
27 | int result = 0; | |
28 | ||
29 | fedisableexcept (FE_ALL_EXCEPT); | |
30 | int ret = feenableexcept (FE_ALL_EXCEPT); | |
31 | if (!EXCEPTION_ENABLE_SUPPORTED (FE_ALL_EXCEPT) && (ret == -1)) | |
32 | { | |
33 | puts ("feenableexcept (FE_ALL_EXCEPT) not supported, cannot test"); | |
34 | return 77; | |
35 | } | |
36 | else if (ret != 0) | |
37 | { | |
38 | puts ("feenableexcept (FE_ALL_EXCEPT) failed"); | |
39 | result = 1; | |
40 | return result; | |
41 | } | |
42 | ||
ecb1e722 AZ |
43 | /* Verify fesetexcept does not cause exception traps. For architectures |
44 | where setting the exception might result in traps the function should | |
47a9eeb9 AZ |
45 | return a nonzero value. |
46 | Also check if the function does not alter the exception mask. */ | |
5146356f | 47 | ret = fesetexcept (FE_ALL_EXCEPT); |
ecb1e722 AZ |
48 | |
49 | _Static_assert (!(EXCEPTION_SET_FORCES_TRAP && !EXCEPTION_TESTS(float)), | |
50 | "EXCEPTION_SET_FORCES_TRAP only makes sense if the " | |
51 | "architecture suports exceptions"); | |
47a9eeb9 AZ |
52 | { |
53 | int exc_before = fegetexcept (); | |
54 | ret = fesetexcept (FE_ALL_EXCEPT); | |
55 | int exc_after = fegetexcept (); | |
56 | if (exc_before != exc_after) | |
57 | { | |
58 | puts ("fesetexcept (FE_ALL_EXCEPT) changed the exceptions mask"); | |
59 | return 1; | |
60 | } | |
61 | } | |
62 | ||
63 | /* Execute some floating-point operations, since on some CPUs exceptions | |
64 | triggers a trap only at the next floating-point instruction. */ | |
65 | volatile double a = 1.0; | |
66 | volatile double b = a + a; | |
67 | math_force_eval (b); | |
68 | volatile long double al = 1.0L; | |
69 | volatile long double bl = al + al; | |
70 | math_force_eval (bl); | |
ecb1e722 | 71 | |
5146356f | 72 | if (ret == 0) |
ecb1e722 AZ |
73 | { |
74 | if (EXCEPTION_SET_FORCES_TRAP) | |
75 | { | |
76 | puts ("unexpected fesetexcept success"); | |
77 | result = 1; | |
78 | } | |
79 | } | |
80 | else if (!EXCEPTION_SET_FORCES_TRAP) | |
5146356f JM |
81 | { |
82 | puts ("fesetexcept (FE_ALL_EXCEPT) failed"); | |
83 | if (EXCEPTION_TESTS (float)) | |
84 | { | |
85 | puts ("failure of fesetexcept was unexpected"); | |
86 | result = 1; | |
87 | } | |
88 | else | |
89 | puts ("failure of fesetexcept OK"); | |
90 | } | |
91 | feclearexcept (FE_ALL_EXCEPT); | |
92 | ||
93 | return result; | |
94 | } | |
95 | ||
47a9eeb9 | 96 | #include <support/test-driver.c> |