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63551311 | 1 | /* Set current rounding direction. |
b168057a | 2 | Copyright (C) 1997-2015 Free Software Foundation, Inc. |
63551311 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
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. | |
63551311 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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
63551311 | 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/>. */ | |
63551311 UD |
19 | |
20 | #include <fenv.h> | |
e40468fa UD |
21 | #include <unistd.h> |
22 | #include <ldsodefs.h> | |
23 | #include <dl-procinfo.h> | |
63551311 UD |
24 | |
25 | int | |
26 | fesetround (int round) | |
27 | { | |
28 | unsigned short int cw; | |
29 | ||
30 | if ((round & ~0xc00) != 0) | |
31 | /* ROUND is no valid rounding mode. */ | |
8a94dfe4 | 32 | return 1; |
63551311 UD |
33 | |
34 | __asm__ ("fnstcw %0" : "=m" (*&cw)); | |
35 | cw &= ~0xc00; | |
36 | cw |= round; | |
37 | __asm__ ("fldcw %0" : : "m" (*&cw)); | |
38 | ||
e40468fa | 39 | /* If the CPU supports SSE we set the MXCSR as well. */ |
afdca0f2 | 40 | if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0) |
e40468fa UD |
41 | { |
42 | unsigned int xcw; | |
43 | ||
44 | __asm__ ("stmxcsr %0" : "=m" (*&xcw)); | |
85dd1003 UD |
45 | xcw &= ~0x6000; |
46 | xcw |= round << 3; | |
e40468fa UD |
47 | __asm__ ("ldmxcsr %0" : : "m" (*&xcw)); |
48 | } | |
49 | ||
8a94dfe4 | 50 | return 0; |
63551311 | 51 | } |
9b8a7277 | 52 | libm_hidden_def (fesetround) |