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3c8325fb | 1 | /* Raise given exceptions, given the SPEFSCR bits for those exceptions. |
bfff8b1b | 2 | Copyright (C) 1997-2017 Free Software Foundation, Inc. |
3c8325fb JM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
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. | |
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 | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <fenv_libc.h> | |
20 | ||
21 | int | |
22 | __FERAISEEXCEPT_INTERNAL (int excepts) | |
23 | { | |
24 | unsigned long f; | |
25 | ||
26 | f = fegetenv_register (); | |
27 | f |= (excepts & SPEFSCR_ALL_EXCEPT); | |
28 | fesetenv_register (f); | |
29 | ||
30 | /* Force the operations that cause the exceptions. */ | |
31 | if ((SPEFSCR_FINVS & excepts) != 0) | |
32 | /* 0 / 0 */ | |
33 | asm volatile ("efsdiv %0,%0,%1" : : "r" (0), "r" (0)); | |
34 | ||
35 | if ((SPEFSCR_FDBZS & excepts) != 0) | |
36 | /* 1.0 / 0.0 */ | |
37 | asm volatile ("efsdiv %0,%0,%1" : : "r" (1.0F), "r" (0)); | |
38 | ||
39 | if ((SPEFSCR_FOVFS & excepts) != 0) | |
40 | /* Largest normalized number plus itself. */ | |
41 | asm volatile ("efsadd %0,%0,%1" : : "r" (0x7f7fffff), "r" (0x7f7fffff)); | |
42 | ||
43 | if ((SPEFSCR_FUNFS & excepts) != 0) | |
44 | /* Smallest normalized number times itself. */ | |
45 | asm volatile ("efsmul %0,%0,%1" : : "r" (0x800000), "r" (0x800000)); | |
46 | ||
47 | if ((SPEFSCR_FINXS & excepts) != 0) | |
48 | /* Smallest normalized minus 1.0 raises the inexact flag. */ | |
49 | asm volatile ("efssub %0,%0,%1" : : "r" (0x00800000), "r" (1.0F)); | |
50 | ||
51 | /* Success. */ | |
52 | return 0; | |
53 | } |