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f24facde | 1 | /* |
f1717362 | 2 | * Copyright (C) 2001-2016 Free Software Foundation, Inc. |
f24facde | 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 | |
6bc9506f | 7 | * Free Software Foundation; either version 3, or (at your option) any |
f24facde | 8 | * later version. |
9 | * | |
f24facde | 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 | * | |
6bc9506f | 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/>. | |
f24facde | 23 | */ |
24 | ||
25 | #define FPRS_NS (1 << 22) /* Non-Standard fpu results */ | |
26 | ||
27 | static void __attribute__((constructor)) | |
28 | set_fast_math (void) | |
29 | { | |
21612212 | 30 | unsigned int fsr; |
f24facde | 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 | } |