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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 | /* ieee754 floating point arithmetic * single and double precision * * BUGS * not much dp done * doesn't generate IEEE754_INEXACT * */ /* * MIPS floating point support * Copyright (C) 1994-2000 Algorithmics Ltd. All rights reserved. * http://www.algor.co.uk * * ######################################################################## * * This program is free software; you can distribute it and/or modify it * under the terms of the GNU General Public License (Version 2) as * published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. * * ######################################################################## */ #include "ieee754int.h" #define DP_EBIAS 1023 #define DP_EMIN (-1022) #define DP_EMAX 1023 #define SP_EBIAS 127 #define SP_EMIN (-126) #define SP_EMAX 127 /* indexed by class */ const char *const ieee754_cname[] = { "Normal", "Zero", "Denormal", "Infinity", "QNaN", "SNaN", }; /* the control status register */ struct ieee754_csr ieee754_csr; /* special constants */ #if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__) #define SPSTR(s,b,m) {m,b,s} #define DPSTR(s,b,mh,ml) {ml,mh,b,s} #endif #ifdef __MIPSEB__ #define SPSTR(s,b,m) {s,b,m} #define DPSTR(s,b,mh,ml) {s,b,mh,ml} #endif const struct ieee754dp_konst __ieee754dp_spcvals[] = { DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */ DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */ DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */ DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */ DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */ DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */ DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */ DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */ DPSTR(0,DP_EMAX+1+DP_EBIAS,0x7FFFF,0xFFFFFFFF), /* + indef quiet Nan */ DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */ DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */ DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */ DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */ DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */ DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */ DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */ DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */ }; const struct ieee754sp_konst __ieee754sp_spcvals[] = { SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */ SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */ SPSTR(0, SP_EBIAS, 0), /* + 1.0 */ SPSTR(1, SP_EBIAS, 0), /* - 1.0 */ SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */ SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */ SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */ SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */ SPSTR(0,SP_EMAX+1+SP_EBIAS,0x3FFFFF), /* + indef quiet Nan */ SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */ SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */ SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */ SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */ SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */ SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */ SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */ SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */ }; int ieee754si_xcpt(int r, const char *op, ...) { struct ieee754xctx ax; if (!TSTX()) return r; ax.op = op; ax.rt = IEEE754_RT_SI; ax.rv.si = r; va_start(ax.ap, op); ieee754_xcpt(&ax); return ax.rv.si; } s64 ieee754di_xcpt(s64 r, const char *op, ...) { struct ieee754xctx ax; if (!TSTX()) return r; ax.op = op; ax.rt = IEEE754_RT_DI; ax.rv.di = r; va_start(ax.ap, op); ieee754_xcpt(&ax); return ax.rv.di; } |