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8c34028d | 1 | /* Set current rounding direction. |
2b778ceb | 2 | Copyright (C) 2000-2021 Free Software Foundation, Inc. |
8c34028d 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. | |
8c34028d 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. |
8c34028d | 15 | |
3214b89b | 16 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff | 17 | License along with the GNU C Library. If not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
8c34028d UD |
19 | |
20 | #include <fenv.h> | |
21 | ||
22 | int | |
01238691 | 23 | __fesetround (int round) |
8c34028d | 24 | { |
48dcf1c5 | 25 | union { unsigned long long l; unsigned int sw[2]; } s; |
8c34028d UD |
26 | |
27 | if (round & ~FE_DOWNWARD) | |
48dcf1c5 | 28 | /* round is not a valid rounding mode. */ |
8c34028d | 29 | return 1; |
5556231d | 30 | |
8c34028d | 31 | /* Get the current status word. */ |
48dcf1c5 CD |
32 | __asm__ ("fstd %%fr0,0(%1)" : "=m" (s.l) : "r" (&s.l) : "%r0"); |
33 | s.sw[0] &= ~FE_DOWNWARD; | |
34 | s.sw[0] |= round & FE_DOWNWARD; | |
35 | __asm__ ("fldd 0(%0),%%fr0" : : "r" (&s.l), "m" (s.l) : "%r0"); | |
8c34028d UD |
36 | |
37 | return 0; | |
38 | } | |
48dcf1c5 | 39 | |
01238691 JM |
40 | libm_hidden_def (__fesetround) |
41 | weak_alias (__fesetround, fesetround) | |
42 | libm_hidden_weak (fesetround) |