1 | /* Test fesetexcept: exception traps enabled. |
2 | Copyright (C) 2016-2024 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 <stdio.h> |
21 | #include <math-tests.h> |
22 | #include <math-barriers.h> |
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 (s: "feenableexcept (FE_ALL_EXCEPT) not supported, cannot test" ); |
34 | return 77; |
35 | } |
36 | else if (ret != 0) |
37 | { |
38 | puts (s: "feenableexcept (FE_ALL_EXCEPT) failed" ); |
39 | result = 1; |
40 | return result; |
41 | } |
42 | |
43 | /* Verify fesetexcept does not cause exception traps. For architectures |
44 | where setting the exception might result in traps the function should |
45 | return a nonzero value. |
46 | Also check if the function does not alter the exception mask. */ |
47 | ret = fesetexcept (FE_ALL_EXCEPT); |
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" ); |
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 (s: "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); |
71 | |
72 | if (ret == 0) |
73 | { |
74 | if (EXCEPTION_SET_FORCES_TRAP) |
75 | { |
76 | puts (s: "unexpected fesetexcept success" ); |
77 | result = 1; |
78 | } |
79 | } |
80 | else if (!EXCEPTION_SET_FORCES_TRAP) |
81 | { |
82 | puts (s: "fesetexcept (FE_ALL_EXCEPT) failed" ); |
83 | if (EXCEPTION_TESTS (float)) |
84 | { |
85 | puts (s: "failure of fesetexcept was unexpected" ); |
86 | result = 1; |
87 | } |
88 | else |
89 | puts (s: "failure of fesetexcept OK" ); |
90 | } |
91 | feclearexcept (FE_ALL_EXCEPT); |
92 | |
93 | return result; |
94 | } |
95 | |
96 | #include <support/test-driver.c> |
97 | |