Mercurial > hg > CbC > CbC_gcc
comparison gcc/config/sparc/crtfastmath.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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-1:000000000000 | 0:a06113de4d67 |
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1 /* | |
2 * Copyright (C) 2001, 2009 Free Software Foundation, Inc. | |
3 * Contributed by David S. Miller (davem@redhat.com) | |
4 * | |
5 * This file is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License as published by the | |
7 * Free Software Foundation; either version 3, or (at your option) any | |
8 * later version. | |
9 * | |
10 * This file is distributed in the hope that it will be useful, but | |
11 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 * General Public License for more details. | |
14 * | |
15 * Under Section 7 of GPL version 3, you are granted additional | |
16 * permissions described in the GCC Runtime Library Exception, version | |
17 * 3.1, as published by the Free Software Foundation. | |
18 * | |
19 * You should have received a copy of the GNU General Public License and | |
20 * a copy of the GCC Runtime Library Exception along with this program; | |
21 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
22 * <http://www.gnu.org/licenses/>. | |
23 */ | |
24 | |
25 #define FPRS_NS (1 << 22) /* Non-Standard fpu results */ | |
26 | |
27 static void __attribute__((constructor)) | |
28 set_fast_math (void) | |
29 { | |
30 unsigned int fsr; | |
31 | |
32 /* This works for the 64-bit case because, even if 32-bit ld/st of | |
33 the fsr register modified the upper 32-bit, the only thing up there | |
34 are the 3 other condition codes which are "do not care" at the time | |
35 that this runs. */ | |
36 | |
37 __asm__("st %%fsr, %0" | |
38 : "=m" (fsr)); | |
39 | |
40 fsr |= FPRS_NS; | |
41 | |
42 __asm__("ld %0, %%fsr" | |
43 : : "m" (fsr)); | |
44 } |