[mirror_ubuntu-bionic-kernel.git] / arch / mips / math-emu / dp_fsp.c

/* IEEE754 floating point arithmetic
 * double precision: common utilities
 */
/*
 * 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 "ieee754dp.h"

ieee754dp ieee754dp_fsp(ieee754sp x)
{
	COMPXSP;

	EXPLODEXSP;

	CLEARCX;

	FLUSHXSP;

	switch (xc) {
	case IEEE754_CLASS_SNAN:
		SETCX(IEEE754_INVALID_OPERATION);
		return ieee754dp_nanxcpt(ieee754dp_indef(), "fsp");
	case IEEE754_CLASS_QNAN:
		return ieee754dp_nanxcpt(builddp(xs,
						 DP_EMAX + 1 + DP_EBIAS,
						 ((u64) xm
						  << (DP_MBITS -
						      SP_MBITS))), "fsp",
					 x);
	case IEEE754_CLASS_INF:
		return ieee754dp_inf(xs);
	case IEEE754_CLASS_ZERO:
		return ieee754dp_zero(xs);
	case IEEE754_CLASS_DNORM:
		/* normalize */
		while ((xm >> SP_MBITS) == 0) {
			xm <<= 1;
			xe--;
		}
		break;
	case IEEE754_CLASS_NORM:
		break;
	}

	/* CAN'T possibly overflow,underflow, or need rounding
	 */

	/* drop the hidden bit */
	xm &= ~SP_HIDDEN_BIT;

	return builddp(xs, xe + DP_EBIAS,
		       (u64) xm << (DP_MBITS - SP_MBITS));
}
Commit	Line	Data
1da177e4 LT	1	/* IEEE754 floating point arithmetic
	2	* double precision: common utilities
	3	*/
	4	/*
	5	* MIPS floating point support
	6	* Copyright (C) 1994-2000 Algorithmics Ltd.
1da177e4 LT	7	*
	8	* ########################################################################
	9	*
	10	* This program is free software; you can distribute it and/or modify it
	11	* under the terms of the GNU General Public License (Version 2) as
	12	* published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope it will be useful, but WITHOUT
	15	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	16	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	17	* for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	22	*
	23	* ########################################################################
	24	*/
	25
	26
	27	#include "ieee754dp.h"
	28
	29	ieee754dp ieee754dp_fsp(ieee754sp x)
	30	{
	31	COMPXSP;
	32
	33	EXPLODEXSP;
	34
	35	CLEARCX;
	36
	37	FLUSHXSP;
	38
	39	switch (xc) {
	40	case IEEE754_CLASS_SNAN:
	41	SETCX(IEEE754_INVALID_OPERATION);
	42	return ieee754dp_nanxcpt(ieee754dp_indef(), "fsp");
	43	case IEEE754_CLASS_QNAN:
	44	return ieee754dp_nanxcpt(builddp(xs,
	45	DP_EMAX + 1 + DP_EBIAS,
	46	((u64) xm
	47	<< (DP_MBITS -
	48	SP_MBITS))), "fsp",
	49	x);
	50	case IEEE754_CLASS_INF:
	51	return ieee754dp_inf(xs);
	52	case IEEE754_CLASS_ZERO:
	53	return ieee754dp_zero(xs);
	54	case IEEE754_CLASS_DNORM:
	55	/* normalize */
	56	while ((xm >> SP_MBITS) == 0) {
	57	xm <<= 1;
	58	xe--;
	59	}
	60	break;
	61	case IEEE754_CLASS_NORM:
	62	break;
	63	}
	64
25985edc	65	/* CAN'T possibly overflow,underflow, or need rounding
1da177e4 LT	66	*/
	67
	68	/* drop the hidden bit */
	69	xm &= ~SP_HIDDEN_BIT;
	70
	71	return builddp(xs, xe + DP_EBIAS,
	72	(u64) xm << (DP_MBITS - SP_MBITS));
	73	}