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5a0ff57c | 1 | /* |
7adcbafe | 2 | * Copyright (C) 2014-2022 Free Software Foundation, Inc. |
5a0ff57c SL |
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 | |
6 | * Free Software Foundation; either version 3, or (at your option) any | |
7 | * later version. | |
8 | * | |
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 | * | |
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/>. | |
22 | */ | |
23 | ||
24 | /* Enable flush-to-zero support for -ffast-math on VFP targets. */ | |
25 | #ifndef __SOFTFP__ | |
26 | ||
27 | #define FPSCR_FZ (1 << 24) | |
28 | ||
29 | static void __attribute__((constructor)) | |
30 | __arm_set_fast_math (void) | |
31 | { | |
32 | unsigned int fpscr_save; | |
33 | ||
34 | /* Set the FZ (flush-to-zero) bit in FPSCR. */ | |
35 | __asm__("vmrs %0, fpscr" : "=r" (fpscr_save)); | |
36 | fpscr_save |= FPSCR_FZ; | |
37 | __asm__("vmsr fpscr, %0" : : "r" (fpscr_save)); | |
38 | } | |
39 | ||
40 | #endif /* __SOFTFP__ */ |