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 * 13 * ######################################################################## 14 * 15 * This program is free software; you can distribute it and/or modify it 16 * under the terms of the GNU General Public License (Version 2) as 17 * published by the Free Software Foundation. 18 * 19 * This program is distributed in the hope it will be useful, but WITHOUT 20 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 21 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 22 * for more details. 23 * 24 * You should have received a copy of the GNU General Public License along 25 * with this program; if not, write to the Free Software Foundation, Inc., 26 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 27 * 28 * ######################################################################## 29 */ 30 31 32 #include "ieee754int.h" 33 #include "ieee754sp.h" 34 #include "ieee754dp.h" 35 36 #define DP_EBIAS 1023 37 #define DP_EMIN (-1022) 38 #define DP_EMAX 1023 39 40 #define SP_EBIAS 127 41 #define SP_EMIN (-126) 42 #define SP_EMAX 127 43 44 /* special constants 45 */ 46 47 48 #if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__) 49 #define SPSTR(s, b, m) {m, b, s} 50 #define DPSTR(s, b, mh, ml) {ml, mh, b, s} 51 #endif 52 53 #ifdef __MIPSEB__ 54 #define SPSTR(s, b, m) {s, b, m} 55 #define DPSTR(s, b, mh, ml) {s, b, mh, ml} 56 #endif 57 58 const struct ieee754dp_konst __ieee754dp_spcvals[] = { 59 DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */ 60 DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */ 61 DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */ 62 DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */ 63 DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */ 64 DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */ 65 DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */ 66 DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */ 67 DPSTR(0, DP_EMAX+1+DP_EBIAS, 0x7FFFF, 0xFFFFFFFF), /* + indef quiet Nan */ 68 DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */ 69 DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */ 70 DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */ 71 DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */ 72 DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */ 73 DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */ 74 DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */ 75 DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */ 76 }; 77 78 const struct ieee754sp_konst __ieee754sp_spcvals[] = { 79 SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */ 80 SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */ 81 SPSTR(0, SP_EBIAS, 0), /* + 1.0 */ 82 SPSTR(1, SP_EBIAS, 0), /* - 1.0 */ 83 SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */ 84 SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */ 85 SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */ 86 SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */ 87 SPSTR(0, SP_EMAX+1+SP_EBIAS, 0x3FFFFF), /* + indef quiet Nan */ 88 SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */ 89 SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */ 90 SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */ 91 SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */ 92 SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */ 93 SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */ 94 SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */ 95 SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */ 96 }; 97 98 99 int ieee754si_xcpt(int r, const char *op, ...) 100 { 101 struct ieee754xctx ax; 102 103 if (!TSTX()) 104 return r; 105 ax.op = op; 106 ax.rt = IEEE754_RT_SI; 107 ax.rv.si = r; 108 va_start(ax.ap, op); 109 ieee754_xcpt(&ax); 110 va_end(ax.ap); 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 va_end(ax.ap); 126 return ax.rv.di; 127 } 128