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