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)) 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