1 /* 2 * Copyright (C) 2014-2019 Free Software Foundation, Inc. 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__ */ 41