1 /* Set current rounding direction.
2 Copyright (C) 1997-2025 Free Software Foundation, Inc.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <fenv.h>
19
20 int
fesetround(int round)21 fesetround (int round)
22 {
23 fexcept_t fpcr;
24
25 if (round & ~FE_UPWARD)
26 /* ROUND is no valid rounding mode. */
27 return 1;
28
29 __asm__ ("fmove%.l %!,%0" : "=dm" (fpcr));
30 fpcr &= ~FE_UPWARD;
31 fpcr |= round;
32 __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr));
33
34 return 0;
35 }
36