11da177e4SLinus Torvalds /* ieee754 floating point arithmetic 21da177e4SLinus Torvalds * single and double precision 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * BUGS 51da177e4SLinus Torvalds * not much dp done 61da177e4SLinus Torvalds * doesn't generate IEEE754_INEXACT 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds /* 101da177e4SLinus Torvalds * MIPS floating point support 111da177e4SLinus Torvalds * Copyright (C) 1994-2000 Algorithmics Ltd. 121da177e4SLinus Torvalds * http://www.algor.co.uk 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * ######################################################################## 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * This program is free software; you can distribute it and/or modify it 171da177e4SLinus Torvalds * under the terms of the GNU General Public License (Version 2) as 181da177e4SLinus Torvalds * published by the Free Software Foundation. 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds * This program is distributed in the hope it will be useful, but WITHOUT 211da177e4SLinus Torvalds * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 221da177e4SLinus Torvalds * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 231da177e4SLinus Torvalds * for more details. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License along 261da177e4SLinus Torvalds * with this program; if not, write to the Free Software Foundation, Inc., 271da177e4SLinus Torvalds * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * ######################################################################## 301da177e4SLinus Torvalds */ 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds #include "ieee754int.h" 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #define DP_EBIAS 1023 361da177e4SLinus Torvalds #define DP_EMIN (-1022) 371da177e4SLinus Torvalds #define DP_EMAX 1023 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #define SP_EBIAS 127 401da177e4SLinus Torvalds #define SP_EMIN (-126) 411da177e4SLinus Torvalds #define SP_EMAX 127 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds /* indexed by class */ 441da177e4SLinus Torvalds const char *const ieee754_cname[] = { 451da177e4SLinus Torvalds "Normal", 461da177e4SLinus Torvalds "Zero", 471da177e4SLinus Torvalds "Denormal", 481da177e4SLinus Torvalds "Infinity", 491da177e4SLinus Torvalds "QNaN", 501da177e4SLinus Torvalds "SNaN", 511da177e4SLinus Torvalds }; 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds /* the control status register 541da177e4SLinus Torvalds */ 551da177e4SLinus Torvalds struct ieee754_csr ieee754_csr; 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds /* special constants 581da177e4SLinus Torvalds */ 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__) 621da177e4SLinus Torvalds #define SPSTR(s,b,m) {m,b,s} 631da177e4SLinus Torvalds #define DPSTR(s,b,mh,ml) {ml,mh,b,s} 641da177e4SLinus Torvalds #endif 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds #ifdef __MIPSEB__ 671da177e4SLinus Torvalds #define SPSTR(s,b,m) {s,b,m} 681da177e4SLinus Torvalds #define DPSTR(s,b,mh,ml) {s,b,mh,ml} 691da177e4SLinus Torvalds #endif 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds const struct ieee754dp_konst __ieee754dp_spcvals[] = { 721da177e4SLinus Torvalds DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */ 731da177e4SLinus Torvalds DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */ 741da177e4SLinus Torvalds DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */ 751da177e4SLinus Torvalds DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */ 761da177e4SLinus Torvalds DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */ 771da177e4SLinus Torvalds DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */ 781da177e4SLinus Torvalds DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */ 791da177e4SLinus Torvalds DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */ 801da177e4SLinus Torvalds DPSTR(0,DP_EMAX+1+DP_EBIAS,0x7FFFF,0xFFFFFFFF), /* + indef quiet Nan */ 811da177e4SLinus Torvalds DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */ 821da177e4SLinus Torvalds DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */ 831da177e4SLinus Torvalds DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */ 841da177e4SLinus Torvalds DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */ 851da177e4SLinus Torvalds DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */ 861da177e4SLinus Torvalds DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */ 871da177e4SLinus Torvalds DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */ 881da177e4SLinus Torvalds DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */ 891da177e4SLinus Torvalds }; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds const struct ieee754sp_konst __ieee754sp_spcvals[] = { 921da177e4SLinus Torvalds SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */ 931da177e4SLinus Torvalds SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */ 941da177e4SLinus Torvalds SPSTR(0, SP_EBIAS, 0), /* + 1.0 */ 951da177e4SLinus Torvalds SPSTR(1, SP_EBIAS, 0), /* - 1.0 */ 961da177e4SLinus Torvalds SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */ 971da177e4SLinus Torvalds SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */ 981da177e4SLinus Torvalds SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */ 991da177e4SLinus Torvalds SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */ 1001da177e4SLinus Torvalds SPSTR(0,SP_EMAX+1+SP_EBIAS,0x3FFFFF), /* + indef quiet Nan */ 1011da177e4SLinus Torvalds SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */ 1021da177e4SLinus Torvalds SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */ 1031da177e4SLinus Torvalds SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */ 1041da177e4SLinus Torvalds SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */ 1051da177e4SLinus Torvalds SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */ 1061da177e4SLinus Torvalds SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */ 1071da177e4SLinus Torvalds SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */ 1081da177e4SLinus Torvalds SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */ 1091da177e4SLinus Torvalds }; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds int ieee754si_xcpt(int r, const char *op, ...) 1131da177e4SLinus Torvalds { 1141da177e4SLinus Torvalds struct ieee754xctx ax; 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds if (!TSTX()) 1171da177e4SLinus Torvalds return r; 1181da177e4SLinus Torvalds ax.op = op; 1191da177e4SLinus Torvalds ax.rt = IEEE754_RT_SI; 1201da177e4SLinus Torvalds ax.rv.si = r; 1211da177e4SLinus Torvalds va_start(ax.ap, op); 1221da177e4SLinus Torvalds ieee754_xcpt(&ax); 1231da177e4SLinus Torvalds return ax.rv.si; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds s64 ieee754di_xcpt(s64 r, const char *op, ...) 1271da177e4SLinus Torvalds { 1281da177e4SLinus Torvalds struct ieee754xctx ax; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds if (!TSTX()) 1311da177e4SLinus Torvalds return r; 1321da177e4SLinus Torvalds ax.op = op; 1331da177e4SLinus Torvalds ax.rt = IEEE754_RT_DI; 1341da177e4SLinus Torvalds ax.rv.di = r; 1351da177e4SLinus Torvalds va_start(ax.ap, op); 1361da177e4SLinus Torvalds ieee754_xcpt(&ax); 1371da177e4SLinus Torvalds return ax.rv.di; 1381da177e4SLinus Torvalds } 139