1 /* Copyright (C) 2021-2022 Free Software Foundation, Inc.
2 Contributed by Loongson Ltd.
3 Based on MIPS target for GNU compiler.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 License for more details.
16
17 Under Section 7 of GPL version 3, you are granted additional
18 permissions described in the GCC Runtime Library Exception, version
19 3.1, as published by the Free Software Foundation.
20
21 You should have received a copy of the GNU General Public License
22 and a copy of the GCC Runtime Library Exception along with this
23 program; see the files COPYING3 and COPYING.RUNTIME respectively.
24 If not, see <http://www.gnu.org/licenses/>. */
25
26 #ifdef __loongarch_hard_float
27
28 /* Rounding control. */
29 #define _FPU_RC_NEAREST 0x000 /* RECOMMENDED. */
30 #define _FPU_RC_ZERO 0x100
31 #define _FPU_RC_UP 0x200
32 #define _FPU_RC_DOWN 0x300
33
34 /* Enable interrupts for IEEE exceptions. */
35 #define _FPU_IEEE 0x0000001F
36
37 /* Macros for accessing the hardware control word. */
38 #define _FPU_GETCW(cw) __asm__ volatile ("movfcsr2gr %0,$r0" : "=r" (cw))
39 #define _FPU_SETCW(cw) __asm__ volatile ("movgr2fcsr $r0,%0" : : "r" (cw))
40
41 static void __attribute__((constructor))
set_fast_math(void)42 set_fast_math (void)
43 {
44 unsigned int fcr;
45
46 /* Flush to zero, round to nearest, IEEE exceptions disabled. */
47 fcr = _FPU_RC_NEAREST;
48
49 _FPU_SETCW (fcr);
50 }
51
52 #endif /* __loongarch_hard_float */
53