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32b9e00b UD |
1 | /* Set floating-point environment exception handling. |
2 | Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by David Huggins-Daines <dhd@debian.org>, 2000 | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
3214b89b 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. | |
32b9e00b 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 | |
3214b89b | 14 | Lesser General Public License for more details. |
32b9e00b | 15 | |
3214b89b | 16 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff PE |
17 | License along with the GNU C Library. If not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
32b9e00b UD |
19 | |
20 | #include <fenv.h> | |
21 | #include <math.h> | |
22 | ||
23 | int | |
24 | fesetexceptflag (const fexcept_t *flagp, int excepts) | |
25 | { | |
48dcf1c5 | 26 | union { unsigned long long l; unsigned int sw[2]; } s; |
32b9e00b UD |
27 | |
28 | /* Get the current status word. */ | |
48dcf1c5 CD |
29 | __asm__ ("fstd %%fr0,0(%1)" : "=m" (s.l) : "r" (&s.l) : "%r0"); |
30 | /* Install new raised trap bits */ | |
31 | s.sw[0] |= (*flagp & excepts & FE_ALL_EXCEPT) << 27; | |
32b9e00b | 32 | /* Store the new status word. */ |
48dcf1c5 | 33 | __asm__ ("fldd 0(%0),%%fr0" : : "r" (&s.l), "m" (s.l) : "%r0"); |
32b9e00b UD |
34 | |
35 | /* Success. */ | |
36 | return 0; | |
37 | } |