]>
Commit | Line | Data |
---|---|---|
528be9fe | 1 | /* Set floating-point environment exception handling. |
f7a9f785 | 2 | Copyright (C) 2000-2016 Free Software Foundation, Inc. |
528be9fe AJ |
3 | This file is part of the GNU C Library. |
4 | Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com). | |
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. | |
528be9fe AJ |
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. |
528be9fe | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
528be9fe AJ |
19 | |
20 | #include <fenv_libc.h> | |
21 | #include <math.h> | |
22 | #include <fpu_control.h> | |
23 | ||
24 | int | |
25 | fesetexceptflag (const fexcept_t *flagp, int excepts) | |
26 | { | |
5d96fe8c | 27 | fexcept_t temp, newexcepts; |
528be9fe AJ |
28 | |
29 | /* Get the current environment. We have to do this since we cannot | |
30 | separately set the status word. */ | |
31 | _FPU_GETCW (temp); | |
32 | /* Install the new exception bits in the Accrued Exception Byte. */ | |
33 | excepts = excepts & FE_ALL_EXCEPT; | |
5d96fe8c | 34 | newexcepts = excepts << FPC_FLAGS_SHIFT; |
528be9fe | 35 | temp &= ~newexcepts; |
5d96fe8c SL |
36 | if ((temp & FPC_NOT_FPU_EXCEPTION) == 0) |
37 | /* Bits 6, 7 of dxc-byte are zero, | |
38 | thus bits 0-5 of dxc-byte correspond to the flag-bits. | |
39 | Clear given exceptions in dxc-field. */ | |
40 | temp &= ~(excepts << FPC_DXC_SHIFT); | |
41 | ||
42 | /* Integrate dxc-byte of flagp into flags. The dxc-byte of flagp contains | |
43 | either an ieee-exception or 0 (see fegetexceptflag). */ | |
44 | temp |= (*flagp | ((*flagp >> FPC_DXC_SHIFT) << FPC_FLAGS_SHIFT)) | |
45 | & newexcepts; | |
528be9fe AJ |
46 | |
47 | /* Store the new status word (along with the rest of the environment. | |
48 | Possibly new exceptions are set but they won't get executed unless | |
49 | the next floating-point instruction. */ | |
50 | _FPU_SETCW (temp); | |
51 | ||
52 | /* Success. */ | |
53 | return 0; | |
54 | } |