1 /* IEEE754 floating point arithmetic 2 * single precision 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 "ieee754sp.h" 28 29 int ieee754sp_finite(ieee754sp x) 30 { 31 return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS; 32 } 33 34 ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y) 35 { 36 CLEARCX; 37 SPSIGN(x) = SPSIGN(y); 38 return x; 39 } 40 41 42 ieee754sp ieee754sp_neg(ieee754sp x) 43 { 44 COMPXSP; 45 46 EXPLODEXSP; 47 CLEARCX; 48 FLUSHXSP; 49 50 /* 51 * Invert the sign ALWAYS to prevent an endless recursion on 52 * pow() in libc. 53 */ 54 /* quick fix up */ 55 SPSIGN(x) ^= 1; 56 57 if (xc == IEEE754_CLASS_SNAN) { 58 ieee754sp y = ieee754sp_indef(); 59 SETCX(IEEE754_INVALID_OPERATION); 60 SPSIGN(y) = SPSIGN(x); 61 return ieee754sp_nanxcpt(y, "neg"); 62 } 63 64 return x; 65 } 66 67 68 ieee754sp ieee754sp_abs(ieee754sp x) 69 { 70 COMPXSP; 71 72 EXPLODEXSP; 73 CLEARCX; 74 FLUSHXSP; 75 76 /* Clear sign ALWAYS, irrespective of NaN */ 77 SPSIGN(x) = 0; 78 79 if (xc == IEEE754_CLASS_SNAN) { 80 SETCX(IEEE754_INVALID_OPERATION); 81 return ieee754sp_nanxcpt(ieee754sp_indef(), "abs"); 82 } 83 84 return x; 85 } 86