1 /* ieee754 floating point arithmetic 2 * single and double precision 3 * 4 * BUGS 5 * not much dp done 6 * doesn't generate IEEE754_INEXACT 7 * 8 */ 9 /* 10 * MIPS floating point support 11 * Copyright (C) 1994-2000 Algorithmics Ltd. 12 * http://www.algor.co.uk 13 * 14 * ######################################################################## 15 * 16 * This program is free software; you can distribute it and/or modify it 17 * under the terms of the GNU General Public License (Version 2) as 18 * published by the Free Software Foundation. 19 * 20 * This program is distributed in the hope it will be useful, but WITHOUT 21 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 22 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 23 * for more details. 24 * 25 * You should have received a copy of the GNU General Public License along 26 * with this program; if not, write to the Free Software Foundation, Inc., 27 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 28 * 29 * ######################################################################## 30 */ 31 32 33 #include "ieee754int.h" 34 #include "ieee754sp.h" 35 #include "ieee754dp.h" 36 37 #define DP_EBIAS 1023 38 #define DP_EMIN (-1022) 39 #define DP_EMAX 1023 40 41 #define SP_EBIAS 127 42 #define SP_EMIN (-126) 43 #define SP_EMAX 127 44 45 /* special constants 46 */ 47 48 49 #if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__) 50 #define SPSTR(s,b,m) {m,b,s} 51 #define DPSTR(s,b,mh,ml) {ml,mh,b,s} 52 #endif 53 54 #ifdef __MIPSEB__ 55 #define SPSTR(s,b,m) {s,b,m} 56 #define DPSTR(s,b,mh,ml) {s,b,mh,ml} 57 #endif 58 59 const struct ieee754dp_konst __ieee754dp_spcvals[] = { 60 DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */ 61 DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */ 62 DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */ 63 DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */ 64 DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */ 65 DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */ 66 DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */ 67 DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */ 68 DPSTR(0,DP_EMAX+1+DP_EBIAS,0x7FFFF,0xFFFFFFFF), /* + indef quiet Nan */ 69 DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */ 70 DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */ 71 DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */ 72 DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */ 73 DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */ 74 DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */ 75 DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */ 76 DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */ 77 }; 78 79 const struct ieee754sp_konst __ieee754sp_spcvals[] = { 80 SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */ 81 SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */ 82 SPSTR(0, SP_EBIAS, 0), /* + 1.0 */ 83 SPSTR(1, SP_EBIAS, 0), /* - 1.0 */ 84 SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */ 85 SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */ 86 SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */ 87 SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */ 88 SPSTR(0,SP_EMAX+1+SP_EBIAS,0x3FFFFF), /* + indef quiet Nan */ 89 SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */ 90 SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */ 91 SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */ 92 SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */ 93 SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */ 94 SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */ 95 SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */ 96 SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */ 97 }; 98 99 100 int ieee754si_xcpt(int r, const char *op, ...) 101 { 102 struct ieee754xctx ax; 103 104 if (!TSTX()) 105 return r; 106 ax.op = op; 107 ax.rt = IEEE754_RT_SI; 108 ax.rv.si = r; 109 va_start(ax.ap, op); 110 ieee754_xcpt(&ax); 111 return ax.rv.si; 112 } 113 114 s64 ieee754di_xcpt(s64 r, const char *op, ...) 115 { 116 struct ieee754xctx ax; 117 118 if (!TSTX()) 119 return r; 120 ax.op = op; 121 ax.rt = IEEE754_RT_DI; 122 ax.rv.di = r; 123 va_start(ax.ap, op); 124 ieee754_xcpt(&ax); 125 return ax.rv.di; 126 } 127