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1f8d3bd8 | 1 | /* Store current floating-point environment and clear exceptions. |
b168057a | 2 | Copyright (C) 2000-2015 Free Software Foundation, Inc. |
1f8d3bd8 UD |
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. | |
1f8d3bd8 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. |
1f8d3bd8 | 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/>. */ | |
1f8d3bd8 UD |
19 | |
20 | #include <fenv.h> | |
21 | #include <string.h> | |
22 | ||
23 | int | |
24 | feholdexcept (fenv_t *envp) | |
25 | { | |
48dcf1c5 CD |
26 | union { unsigned long long buf[4]; fenv_t env; } clear; |
27 | unsigned long long *bufptr; | |
1f8d3bd8 UD |
28 | |
29 | /* Store the environment. */ | |
48dcf1c5 | 30 | bufptr = clear.buf; |
4923dcf1 UD |
31 | __asm__ ( |
32 | "fstd,ma %%fr0,8(%1)\n" | |
48dcf1c5 CD |
33 | : "=m" (clear), "+r" (bufptr) : : "%r0"); |
34 | memcpy (envp, &clear.env, sizeof (fenv_t)); | |
1f8d3bd8 | 35 | |
48dcf1c5 CD |
36 | /* Clear exception queues */ |
37 | memset (clear.env.__exception, 0, sizeof (clear.env.__exception)); | |
1f8d3bd8 | 38 | /* And set all exceptions to non-stop. */ |
48dcf1c5 CD |
39 | clear.env.__status_word &= ~FE_ALL_EXCEPT; |
40 | /* Now clear all flags */ | |
41 | clear.env.__status_word &= ~(FE_ALL_EXCEPT << 27); | |
1f8d3bd8 | 42 | |
5556231d | 43 | /* Load the new environment. Note: fr0 must load last to enable T-bit |
48dcf1c5 | 44 | Thus we start bufptr at the end and work backwards */ |
80ceeaee | 45 | bufptr = (unsigned long long *)((unsigned int)(clear.buf) + sizeof(unsigned int)*4); |
4923dcf1 | 46 | __asm__ ( |
48dcf1c5 CD |
47 | "fldd,mb -8(%0),%%fr0\n" |
48 | : : "r" (bufptr), "m" (clear) : "%r0"); | |
1f8d3bd8 UD |
49 | |
50 | return 0; | |
51 | } | |
48dcf1c5 CD |
52 | |
53 | libm_hidden_def (feholdexcept) |