]>
Commit | Line | Data |
---|---|---|
63551311 | 1 | /* Set floating-point environment exception handling. |
581c785b | 2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
63551311 | 3 | This file is part of the GNU C Library. |
63551311 UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
63551311 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
63551311 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
63551311 UD |
18 | |
19 | #include <fenv.h> | |
20 | #include <math.h> | |
11bf8ce1 UD |
21 | #include <unistd.h> |
22 | #include <ldsodefs.h> | |
23 | #include <dl-procinfo.h> | |
63551311 | 24 | |
63ae7b63 UD |
25 | int |
26 | __fesetexceptflag (const fexcept_t *flagp, int excepts) | |
63551311 UD |
27 | { |
28 | fenv_t temp; | |
29 | ||
30 | /* Get the current environment. We have to do this since we cannot | |
31 | separately set the status word. */ | |
32 | __asm__ ("fnstenv %0" : "=m" (*&temp)); | |
33 | ||
33d1a2c5 UD |
34 | temp.__status_word &= ~(excepts & FE_ALL_EXCEPT); |
35 | temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT; | |
63551311 UD |
36 | |
37 | /* Store the new status word (along with the rest of the environment. | |
38 | Possibly new exceptions are set but they won't get executed unless | |
39 | the next floating-point instruction. */ | |
40 | __asm__ ("fldenv %0" : : "m" (*&temp)); | |
63ae7b63 | 41 | |
11bf8ce1 | 42 | /* If the CPU supports SSE, we set the MXCSR as well. */ |
107e6a3c | 43 | if (CPU_FEATURE_USABLE (SSE)) |
11bf8ce1 UD |
44 | { |
45 | unsigned int xnew_exc; | |
46 | ||
47 | /* Get the current MXCSR. */ | |
48 | __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); | |
49 | ||
50 | /* Set the relevant bits. */ | |
51 | xnew_exc &= ~(excepts & FE_ALL_EXCEPT); | |
52 | xnew_exc |= *flagp & excepts & FE_ALL_EXCEPT; | |
53 | ||
54 | /* Put the new data in effect. */ | |
55 | __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); | |
56 | } | |
afdca0f2 | 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 (__fesetexceptflag, __old_fesetexceptflag) |
e97ed6dd | 65 | compat_symbol (libm, __old_fesetexceptflag, fesetexceptflag, GLIBC_2_1); |
4eb8a862 RM |
66 | #endif |
67 | ||
e97ed6dd | 68 | versioned_symbol (libm, __fesetexceptflag, fesetexceptflag, GLIBC_2_2); |