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 35 #define DP_EBIAS 1023 36 #define DP_EMIN (-1022) 37 #define DP_EMAX 1023 38 39 #define SP_EBIAS 127 40 #define SP_EMIN (-126) 41 #define SP_EMAX 127 42 43 /* indexed by class */ 44 const char *const ieee754_cname[] = { 45 "Normal", 46 "Zero", 47 "Denormal", 48 "Infinity", 49 "QNaN", 50 "SNaN", 51 }; 52 53 /* the control status register 54 */ 55 struct ieee754_csr ieee754_csr; 56 57 /* special constants 58 */ 59 60 61 #if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__) 62 #define SPSTR(s,b,m) {m,b,s} 63 #define DPSTR(s,b,mh,ml) {ml,mh,b,s} 64 #endif 65 66 #ifdef __MIPSEB__ 67 #define SPSTR(s,b,m) {s,b,m} 68 #define DPSTR(s,b,mh,ml) {s,b,mh,ml} 69 #endif 70 71 const struct ieee754dp_konst __ieee754dp_spcvals[] = { 72 DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */ 73 DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */ 74 DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */ 75 DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */ 76 DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */ 77 DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */ 78 DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */ 79 DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */ 80 DPSTR(0,DP_EMAX+1+DP_EBIAS,0x7FFFF,0xFFFFFFFF), /* + indef quiet Nan */ 81 DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */ 82 DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */ 83 DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */ 84 DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */ 85 DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */ 86 DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */ 87 DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */ 88 DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */ 89 }; 90 91 const struct ieee754sp_konst __ieee754sp_spcvals[] = { 92 SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */ 93 SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */ 94 SPSTR(0, SP_EBIAS, 0), /* + 1.0 */ 95 SPSTR(1, SP_EBIAS, 0), /* - 1.0 */ 96 SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */ 97 SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */ 98 SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */ 99 SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */ 100 SPSTR(0,SP_EMAX+1+SP_EBIAS,0x3FFFFF), /* + indef quiet Nan */ 101 SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */ 102 SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */ 103 SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */ 104 SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */ 105 SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */ 106 SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */ 107 SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */ 108 SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */ 109 }; 110 111 112 int ieee754si_xcpt(int r, const char *op, ...) 113 { 114 struct ieee754xctx ax; 115 116 if (!TSTX()) 117 return r; 118 ax.op = op; 119 ax.rt = IEEE754_RT_SI; 120 ax.rv.si = r; 121 va_start(ax.ap, op); 122 ieee754_xcpt(&ax); 123 return ax.rv.si; 124 } 125 126 s64 ieee754di_xcpt(s64 r, const char *op, ...) 127 { 128 struct ieee754xctx ax; 129 130 if (!TSTX()) 131 return r; 132 ax.op = op; 133 ax.rt = IEEE754_RT_DI; 134 ax.rv.di = r; 135 va_start(ax.ap, op); 136 ieee754_xcpt(&ax); 137 return ax.rv.di; 138 } 139