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577565f9 1/*
83ffe9cd 2 * Copyright (C) 2007-2023 Free Software Foundation, Inc.
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3 *
4 * This file is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
748086b7 6 * Free Software Foundation; either version 3, or (at your option) any
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7 * later version.
8 *
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9 * This file is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
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14 * Under Section 7 of GPL version 3, you are granted additional
15 * permissions described in the GCC Runtime Library Exception, version
16 * 3.1, as published by the Free Software Foundation.
17 *
18 * You should have received a copy of the GNU General Public License and
19 * a copy of the GCC Runtime Library Exception along with this program;
20 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
21 * <http://www.gnu.org/licenses/>.
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22 */
23
61221141 24#ifndef _SOFT_FLOAT
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25#if __PREC == 32
26 #define X87CW (0 << 8) /* Single precision (24 bits) */
27#elif __PREC == 64
28 #define X87CW (2 << 8) /* Double precision (53 bits) */
29#elif __PREC == 80
30 #define X87CW (3 << 8) /* Extended precision (64 bits) */
31#else
32 #error "Wrong precision requested."
33#endif
34
35#define X87CW_PCMASK (3 << 8)
36
37static void __attribute__((constructor))
38set_precision (void)
39{
40 unsigned short int cwd;
41
0a76bba4 42 asm volatile ("fnstcw\t%0" : "=m" (cwd));
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43
44 cwd &= ~X87CW_PCMASK;
45 cwd |= X87CW;
46
47 asm volatile ("fldcw\t%0" : : "m" (cwd));
48}
61221141 49#endif