1/* IEEE754 floating point arithmetic 2 * double precision: common utilities 3 */ 4/* 5 * MIPS floating point support 6 * Copyright (C) 1994-2000 Algorithmics Ltd. 7 * 8 * This program is free software; you can distribute it and/or modify it 9 * under the terms of the GNU General Public License (Version 2) as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * for more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 */ 21 22#include "ieee754dp.h" 23 24union ieee754dp ieee754dp_neg(union ieee754dp x) 25{ 26 union ieee754dp y; 27 28 if (ieee754_csr.abs2008) { 29 y = x; 30 DPSIGN(y) = !DPSIGN(x); 31 } else { 32 unsigned int oldrm; 33 34 oldrm = ieee754_csr.rm; 35 ieee754_csr.rm = FPU_CSR_RD; 36 y = ieee754dp_sub(ieee754dp_zero(0), x); 37 ieee754_csr.rm = oldrm; 38 } 39 return y; 40} 41 42union ieee754dp ieee754dp_abs(union ieee754dp x) 43{ 44 union ieee754dp y; 45 46 if (ieee754_csr.abs2008) { 47 y = x; 48 DPSIGN(y) = 0; 49 } else { 50 unsigned int oldrm; 51 52 oldrm = ieee754_csr.rm; 53 ieee754_csr.rm = FPU_CSR_RD; 54 if (DPSIGN(x)) 55 y = ieee754dp_sub(ieee754dp_zero(0), x); 56 else 57 y = ieee754dp_add(ieee754dp_zero(0), x); 58 ieee754_csr.rm = oldrm; 59 } 60 return y; 61} 62