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 * http://www.algor.co.uk 8 * 9 * ######################################################################## 10 * 11 * This program is free software; you can distribute it and/or modify it 12 * under the terms of the GNU General Public License (Version 2) as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope it will be useful, but WITHOUT 16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 18 * for more details. 19 * 20 * You should have received a copy of the GNU General Public License along 21 * with this program; if not, write to the Free Software Foundation, Inc., 22 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 23 * 24 * ######################################################################## 25 */ 26 27 28 #include "ieee754dp.h" 29 30 int ieee754dp_finite(ieee754dp x) 31 { 32 return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS; 33 } 34 35 ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y) 36 { 37 CLEARCX; 38 DPSIGN(x) = DPSIGN(y); 39 return x; 40 } 41 42 43 ieee754dp ieee754dp_neg(ieee754dp x) 44 { 45 COMPXDP; 46 47 EXPLODEXDP; 48 CLEARCX; 49 FLUSHXDP; 50 51 /* 52 * Invert the sign ALWAYS to prevent an endless recursion on 53 * pow() in libc. 54 */ 55 /* quick fix up */ 56 DPSIGN(x) ^= 1; 57 58 if (xc == IEEE754_CLASS_SNAN) { 59 ieee754dp y = ieee754dp_indef(); 60 SETCX(IEEE754_INVALID_OPERATION); 61 DPSIGN(y) = DPSIGN(x); 62 return ieee754dp_nanxcpt(y, "neg"); 63 } 64 65 if (ieee754dp_isnan(x)) /* but not infinity */ 66 return ieee754dp_nanxcpt(x, "neg", x); 67 return x; 68 } 69 70 71 ieee754dp ieee754dp_abs(ieee754dp x) 72 { 73 COMPXDP; 74 75 EXPLODEXDP; 76 CLEARCX; 77 FLUSHXDP; 78 79 if (xc == IEEE754_CLASS_SNAN) { 80 SETCX(IEEE754_INVALID_OPERATION); 81 return ieee754dp_nanxcpt(ieee754dp_indef(), "neg"); 82 } 83 84 if (ieee754dp_isnan(x)) /* but not infinity */ 85 return ieee754dp_nanxcpt(x, "abs", x); 86 87 /* quick fix up */ 88 DPSIGN(x) = 0; 89 return x; 90 } 91