1/* 2 * Copyright (C) 2001-2022 Free Software Foundation, Inc. 3 * Contributed by David S. Miller (davem@redhat.com) 4 * 5 * This file is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License as published by the 7 * Free Software Foundation; either version 3, or (at your option) any 8 * later version. 9 * 10 * This file is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * Under Section 7 of GPL version 3, you are granted additional 16 * permissions described in the GCC Runtime Library Exception, version 17 * 3.1, as published by the Free Software Foundation. 18 * 19 * You should have received a copy of the GNU General Public License and 20 * a copy of the GCC Runtime Library Exception along with this program; 21 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 22 * <http://www.gnu.org/licenses/>. 23 */ 24 25#define FPRS_NS (1 << 22) /* Non-Standard fpu results */ 26 27static void __attribute__((constructor)) 28set_fast_math (void) 29{ 30 unsigned int fsr; 31 32 /* This works for the 64-bit case because, even if 32-bit ld/st of 33 the fsr register modified the upper 32-bit, the only thing up there 34 are the 3 other condition codes which are "do not care" at the time 35 that this runs. */ 36 37 __asm__("st %%fsr, %0" 38 : "=m" (fsr)); 39 40 fsr |= FPRS_NS; 41 42 __asm__("ld %0, %%fsr" 43 : : "m" (fsr)); 44} 45