| 1 | /* Set current rounding direction. |
|---|
| 2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
|---|
| 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 | <https://www.gnu.org/licenses/>. */ |
|---|
| 18 | |
|---|
| 19 | #include <fenv_libc.h> |
|---|
| 20 | |
|---|
| 21 | int |
|---|
| 22 | __fesetround (int round) |
|---|
| 23 | { |
|---|
| 24 | unsigned long fpcr; |
|---|
| 25 | |
|---|
| 26 | if (round & ~3) |
|---|
| 27 | return 1; |
|---|
| 28 | |
|---|
| 29 | /* Get the current state. */ |
|---|
| 30 | __asm__ __volatile__("excb; mf_fpcr %0" : "=f" (fpcr)); |
|---|
| 31 | |
|---|
| 32 | /* Set the relevant bits. */ |
|---|
| 33 | fpcr = ((fpcr & ~FPCR_ROUND_MASK) |
|---|
| 34 | | ((unsigned long)round << FPCR_ROUND_SHIFT)); |
|---|
| 35 | |
|---|
| 36 | /* Put the new state in effect. */ |
|---|
| 37 | __asm__ __volatile__("mt_fpcr %0; excb" : : "f" (fpcr)); |
|---|
| 38 | |
|---|
| 39 | return 0; |
|---|
| 40 | } |
|---|
| 41 | libm_hidden_def (__fesetround) |
|---|
| 42 | weak_alias (__fesetround, fesetround) |
|---|
| 43 | libm_hidden_weak (fesetround) |
|---|
| 44 | |
|---|
