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91650f79 | 1 | /* Set current rounding direction. |
688903eb | 2 | Copyright (C) 1997-2018 Free Software Foundation, Inc. |
91650f79 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Richard Henderson <rth@tamu.edu>, 1997 | |
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. | |
91650f79 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. |
91650f79 | 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/>. */ | |
91650f79 | 19 | |
c9bca511 | 20 | #include <fenv_libc.h> |
91650f79 UD |
21 | |
22 | int | |
01238691 | 23 | __fesetround (int round) |
91650f79 UD |
24 | { |
25 | unsigned long fpcr; | |
26 | ||
27 | if (round & ~3) | |
16e4bf6f | 28 | return 1; |
91650f79 UD |
29 | |
30 | /* Get the current state. */ | |
31 | __asm__ __volatile__("excb; mf_fpcr %0" : "=f"(fpcr)); | |
32 | ||
33 | /* Set the relevant bits. */ | |
c9bca511 UD |
34 | fpcr = ((fpcr & ~FPCR_ROUND_MASK) |
35 | | ((unsigned long)round << FPCR_ROUND_SHIFT)); | |
91650f79 UD |
36 | |
37 | /* Put the new state in effect. */ | |
38 | __asm__ __volatile__("mt_fpcr %0; excb" : : "f"(fpcr)); | |
39 | ||
16e4bf6f | 40 | return 0; |
91650f79 | 41 | } |
01238691 JM |
42 | libm_hidden_def (__fesetround) |
43 | weak_alias (__fesetround, fesetround) | |
44 | libm_hidden_weak (fesetround) |