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Diffstat (limited to 'arch/mips/math-emu/ieee754.c')
| -rw-r--r-- | arch/mips/math-emu/ieee754.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/arch/mips/math-emu/ieee754.c b/arch/mips/math-emu/ieee754.c new file mode 100644 index 0000000..f0a364a --- /dev/null +++ b/arch/mips/math-emu/ieee754.c @@ -0,0 +1,138 @@ +/* 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. + * 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; +} |
