1 /* Set the FPU control word.
2 Copyright (C) 1996-2022 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 <math.h>
20 #include <fpu_control.h>
21
22 void
__setfpucw(fpu_control_t set)23 __setfpucw (fpu_control_t set)
24 {
25 fpu_control_t cw;
26
27 /* Fetch the current control word. */
28 _FPU_GETCW (cw);
29
30 /* Preserve the reserved bits, and set the rest as the user
31 specified (or the default, if the user gave zero). */
32 cw &= _FPU_RESERVED;
33 cw |= set & ~_FPU_RESERVED;
34
35 _FPU_SETCW (cw);
36 }
37