sfp-exceptions.c revision 1.3
1/* 2 * Copyright (C) 2012-2015 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#include "sfp-machine.h" 25 26void 27__sfp_handle_exceptions (int _fex) 28{ 29 const float fp_max = __FLT_MAX__; 30 const float fp_min = __FLT_MIN__; 31 const float fp_1e32 = 1.0e32f; 32 const float fp_zero = 0.0; 33 const float fp_one = 1.0; 34 unsigned fpsr; 35 36 if (_fex & FP_EX_INVALID) 37 { 38 __asm__ __volatile__ ("fdiv\ts0, %s0, %s0" 39 : 40 : "w" (fp_zero) 41 : "s0"); 42 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr)); 43 } 44 if (_fex & FP_EX_DIVZERO) 45 { 46 __asm__ __volatile__ ("fdiv\ts0, %s0, %s1" 47 : 48 : "w" (fp_one), "w" (fp_zero) 49 : "s0"); 50 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr)); 51 } 52 if (_fex & FP_EX_OVERFLOW) 53 { 54 __asm__ __volatile__ ("fadd\ts0, %s0, %s1" 55 : 56 : "w" (fp_max), "w" (fp_1e32) 57 : "s0"); 58 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr)); 59 } 60 if (_fex & FP_EX_UNDERFLOW) 61 { 62 __asm__ __volatile__ ("fmul\ts0, %s0, %s0" 63 : 64 : "w" (fp_min) 65 : "s0"); 66 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr)); 67 } 68 if (_fex & FP_EX_INEXACT) 69 { 70 __asm__ __volatile__ ("fsub\ts0, %s0, %s1" 71 : 72 : "w" (fp_max), "w" (fp_one) 73 : "s0"); 74 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr)); 75 } 76} 77