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63551311 | 1 | /* Clear given exceptions in current floating-point environment. |
d614a753 | 2 | Copyright (C) 1997-2020 Free Software Foundation, Inc. |
63551311 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
63551311 UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
63551311 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
63551311 UD |
19 | |
20 | #include <fenv.h> | |
11bf8ce1 UD |
21 | #include <unistd.h> |
22 | #include <ldsodefs.h> | |
23 | #include <dl-procinfo.h> | |
63551311 | 24 | |
63ae7b63 UD |
25 | int |
26 | __feclearexcept (int excepts) | |
63551311 UD |
27 | { |
28 | fenv_t temp; | |
29 | ||
30 | /* Mask out unsupported bits/exceptions. */ | |
31 | excepts &= FE_ALL_EXCEPT; | |
32 | ||
33 | /* Bah, we have to clear selected exceptions. Since there is no | |
34 | `fldsw' instruction we have to do it the hard way. */ | |
35 | __asm__ ("fnstenv %0" : "=m" (*&temp)); | |
36 | ||
37 | /* Clear the relevant bits. */ | |
33d1a2c5 | 38 | temp.__status_word &= excepts ^ FE_ALL_EXCEPT; |
63551311 UD |
39 | |
40 | /* Put the new data in effect. */ | |
41 | __asm__ ("fldenv %0" : : "m" (*&temp)); | |
63ae7b63 | 42 | |
11bf8ce1 | 43 | /* If the CPU supports SSE, we clear the MXCSR as well. */ |
bf773019 | 44 | if (HAS_CPU_FEATURE (SSE)) |
11bf8ce1 UD |
45 | { |
46 | unsigned int xnew_exc; | |
47 | ||
48 | /* Get the current MXCSR. */ | |
49 | __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); | |
26721ed6 | 50 | |
11bf8ce1 | 51 | /* Clear the relevant bits. */ |
ff136edd | 52 | xnew_exc &= ~excepts; |
26721ed6 | 53 | |
11bf8ce1 UD |
54 | /* Put the new data in effect. */ |
55 | __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); | |
56 | } | |
57 | ||
63ae7b63 UD |
58 | /* Success. */ |
59 | return 0; | |
63551311 | 60 | } |
4eb8a862 RM |
61 | |
62 | #include <shlib-compat.h> | |
63 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) | |
63ae7b63 | 64 | strong_alias (__feclearexcept, __old_feclearexcept) |
4eb8a862 RM |
65 | compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1); |
66 | #endif | |
67 | ||
5b5b04d6 | 68 | libm_hidden_ver (__feclearexcept, feclearexcept) |
4eb8a862 | 69 | versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2); |