| /* 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. |
| * 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" |
| #include "ieee754sp.h" |
| #include "ieee754dp.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", |
| }; |
| |
| /* 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; |
| } |