linux/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"

/* special constants
*/

#define DPSTR(s, b, mh, ml)						\
{									\
	.sign	= (s),							\
	.bexp	= (b),							\
	.manthi	= (mh),							\
	.mantlo	= (ml)							\
}

const struct ieee754dp_const __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 */
};

#define SPSTR(s, b, m)							\
{									\
	.sign	= (s),							\
	.bexp	= (b),							\
	.mant	= (m)							\
}

const struct ieee754sp_const __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 */
};