[deliverable/linux.git] / arch / mips / math-emu / ieee754.c

/* 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.
 *
 * ########################################################################
 *
 *  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 <linux/compiler.h>

#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

/* 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 __cold 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);
	va_end(ax.ap);
	return ax.rv.si;
}

s64 __cold 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);
	va_end(ax.ap);
	return ax.rv.di;
}
Commit	Line	Data
1da177e4 LT	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.
1da177e4 LT	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
cae55066	31	#include <linux/compiler.h>
1da177e4 LT	32
1da177e4 LT	33	#include "ieee754int.h"
efec3c4e RB	34	#include "ieee754sp.h"
efec3c4e RB	35	#include "ieee754dp.h"
1da177e4 LT	36
	37	#define DP_EBIAS 1023
	38	#define DP_EMIN (-1022)
	39	#define DP_EMAX 1023
	40
	41	#define SP_EBIAS 127
	42	#define SP_EMIN (-126)
	43	#define SP_EMAX 127
	44
1da177e4 LT	45	/* special constants
	46	*/
	47
	48
	49	#if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) \|\| defined(__MIPSEL__)
21a151d8 RB	50	#define SPSTR(s, b, m) {m, b, s}
21a151d8 RB	51	#define DPSTR(s, b, mh, ml) {ml, mh, b, s}
1da177e4 LT	52	#endif
	53
	54	#ifdef __MIPSEB__
21a151d8 RB	55	#define SPSTR(s, b, m) {s, b, m}
21a151d8 RB	56	#define DPSTR(s, b, mh, ml) {s, b, mh, ml}
1da177e4 LT	57	#endif
	58
	59	const struct ieee754dp_konst __ieee754dp_spcvals[] = {
70342287 RB	60	DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */
70342287 RB	61	DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */
1da177e4 LT	62	DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */
	63	DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */
	64	DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */
	65	DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */
70342287 RB	66	DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */
70342287 RB	67	DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */
21a151d8	68	DPSTR(0, DP_EMAX+1+DP_EBIAS, 0x7FFFF, 0xFFFFFFFF), /* + indef quiet Nan */
1da177e4 LT	69	DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */
	70	DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */
	71	DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */
	72	DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */
70342287 RB	73	DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */
70342287 RB	74	DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */
1da177e4 LT	75	DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */
	76	DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */
	77	};
	78
	79	const struct ieee754sp_konst __ieee754sp_spcvals[] = {
	80	SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */
	81	SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */
	82	SPSTR(0, SP_EBIAS, 0), /* + 1.0 */
	83	SPSTR(1, SP_EBIAS, 0), /* - 1.0 */
	84	SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */
	85	SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */
	86	SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */
	87	SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */
70342287 RB	88	SPSTR(0, SP_EMAX+1+SP_EBIAS, 0x3FFFFF), /* + indef quiet Nan */
	89	SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */
	90	SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */
1da177e4 LT	91	SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */
	92	SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */
	93	SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */
	94	SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */
	95	SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */
	96	SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */
	97	};
	98
	99
cae55066	100	int __cold ieee754si_xcpt(int r, const char *op, ...)
1da177e4 LT	101	{
	102	struct ieee754xctx ax;
	103
	104	if (!TSTX())
	105	return r;
	106	ax.op = op;
	107	ax.rt = IEEE754_RT_SI;
	108	ax.rv.si = r;
	109	va_start(ax.ap, op);
	110	ieee754_xcpt(&ax);
8142294d	111	va_end(ax.ap);
1da177e4 LT	112	return ax.rv.si;
	113	}
	114
cae55066	115	s64 __cold ieee754di_xcpt(s64 r, const char *op, ...)
1da177e4 LT	116	{
	117	struct ieee754xctx ax;
	118
	119	if (!TSTX())
	120	return r;
	121	ax.op = op;
	122	ax.rt = IEEE754_RT_DI;
	123	ax.rv.di = r;
	124	va_start(ax.ap, op);
	125	ieee754_xcpt(&ax);
8142294d	126	va_end(ax.ap);
1da177e4 LT	127	return ax.rv.di;
1da177e4 LT	128	}