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[glibc/history.git] / math / setfpucw.c
blobcb50f9f3f15bd131a5e6e636578e648ba1a65765
1 /* Set the FPU control word.
2 Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <math.h>
21 #include <fpu_control.h>
23 void
24 __setfpucw (fpu_control_t set)
26 fpu_control_t cw;
28 /* Fetch the current control word. */
29 _FPU_GETCW (cw);
31 /* Preserve the reserved bits, and set the rest as the user
32 specified (or the default, if the user gave zero). */
33 cw &= _FPU_RESERVED;
34 cw |= set & ~_FPU_RESERVED;
36 _FPU_SETCW (cw);