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git.ipfire.org Git - thirdparty/gcc.git/blob - libgcc/config/i386/crtprec.c
2 * Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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
6 * Free Software Foundation; either version 3, or (at your option) any
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.
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.
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/>.
25 #define X87CW (0 << 8) /* Single precision (24 bits) */
27 #define X87CW (2 << 8) /* Double precision (53 bits) */
29 #define X87CW (3 << 8) /* Extended precision (64 bits) */
31 #error "Wrong precision requested."
34 #define X87CW_PCMASK (3 << 8)
36 static void __attribute__((constructor
))
39 unsigned short int cwd
;
41 asm volatile ("fstcw\t%0" : "=m" (cwd
));
46 asm volatile ("fldcw\t%0" : : "m" (cwd
));