crtfastmath.c revision 1.1
1/* 2 * Copyright (C) 2014-2015 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#define _FPU_FPCR_FZ 0x1000000 25 26#define _FPU_SETCW(fpcr) \ 27 { \ 28 __asm__ __volatile__ ("msr fpcr, %0" : : "r" (fpcr)); \ 29 } 30 31static void __attribute__((constructor)) 32set_fast_math (void) 33{ 34 /* Flush to zero, round to nearest, IEEE exceptions disabled. */ 35 _FPU_SETCW (_FPU_FPCR_FZ); 36} 37