1 | /* Test fegetexceptflag and fesetexceptflag: 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 = feraiseexcept (FE_ALL_EXCEPT); |
31 | if (ret != 0) |
32 | { |
33 | if (EXCEPTION_TESTS (float)) |
34 | { |
35 | puts (s: "feraiseexcept (FE_ALL_EXCEPT) failed" ); |
36 | result = 1; |
37 | return result; |
38 | } |
39 | else |
40 | { |
41 | puts (s: "feraiseexcept (FE_ALL_EXCEPT) unsupported, cannot test" ); |
42 | return 77; |
43 | } |
44 | } |
45 | fexcept_t saved; |
46 | ret = fegetexceptflag (flagp: &saved, FE_ALL_EXCEPT); |
47 | if (ret != 0) |
48 | { |
49 | puts (s: "fegetexceptflag failed" ); |
50 | result = 1; |
51 | return result; |
52 | } |
53 | feclearexcept (FE_ALL_EXCEPT); |
54 | |
55 | ret = feenableexcept (FE_ALL_EXCEPT); |
56 | if (!EXCEPTION_ENABLE_SUPPORTED (FE_ALL_EXCEPT) && (ret == -1)) |
57 | { |
58 | puts (s: "feenableexcept (FE_ALL_EXCEPT) not supported, cannot test" ); |
59 | return 77; |
60 | } |
61 | else if (ret != 0) |
62 | { |
63 | puts (s: "feenableexcept (FE_ALL_EXCEPT) failed" ); |
64 | result = 1; |
65 | } |
66 | |
67 | /* The test is that this does not cause exception traps. For architectures |
68 | where setting the exception might result in traps the function should |
69 | return a nonzero value. |
70 | Also check if the function does not alter the exception mask. */ |
71 | ret = fesetexceptflag (flagp: &saved, FE_ALL_EXCEPT); |
72 | |
73 | _Static_assert (!(EXCEPTION_SET_FORCES_TRAP && !EXCEPTION_TESTS(float)), |
74 | "EXCEPTION_SET_FORCES_TRAP only makes sense if the " |
75 | "architecture suports exceptions" ); |
76 | { |
77 | int exc_before = fegetexcept (); |
78 | ret = fesetexceptflag (flagp: &saved, FE_ALL_EXCEPT); |
79 | int exc_after = fegetexcept (); |
80 | if (exc_before != exc_after) |
81 | { |
82 | puts (s: "fesetexceptflag (FE_ALL_EXCEPT) changed the exceptions mask" ); |
83 | return 1; |
84 | } |
85 | } |
86 | |
87 | /* Execute some floating-point operations, since on some CPUs exceptions |
88 | triggers a trap only at the next floating-point instruction. */ |
89 | volatile double a = 1.0; |
90 | volatile double b = a + a; |
91 | math_force_eval (b); |
92 | volatile long double al = 1.0L; |
93 | volatile long double bl = al + al; |
94 | math_force_eval (bl); |
95 | |
96 | if (ret != 0 && !EXCEPTION_SET_FORCES_TRAP) |
97 | { |
98 | puts (s: "fesetexceptflag failed" ); |
99 | result = 1; |
100 | } |
101 | feclearexcept (FE_ALL_EXCEPT); |
102 | |
103 | return result; |
104 | } |
105 | |
106 | #define TEST_FUNCTION do_test () |
107 | #include "../test-skeleton.c" |
108 | |