[linux-2.6-block.git] / arch / mips / math-emu / ieee754dp.h

/*
 * IEEE754 floating point
 * double precision internal header file
 */
/*
 * 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 assert(expr) ((void)0)

/* 3bit extended double precision sticky right shift */
#define XDPSRS(v,rs)	\
  ((rs > (DP_MBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))

#define XDPSRSX1() \
  (xe++, (xm = (xm >> 1) | (xm & 1)))

#define XDPSRS1(v)	\
  (((v) >> 1) | ((v) & 1))

/* convert denormal to normalized with extended exponent */
#define DPDNORMx(m,e) \
  while( (m >> DP_MBITS) == 0) { m <<= 1; e--; }
#define DPDNORMX	DPDNORMx(xm, xe)
#define DPDNORMY	DPDNORMx(ym, ye)

static inline ieee754dp builddp(int s, int bx, u64 m)
{
	ieee754dp r;

	assert((s) == 0 || (s) == 1);
	assert((bx) >= DP_EMIN - 1 + DP_EBIAS
	       && (bx) <= DP_EMAX + 1 + DP_EBIAS);
	assert(((m) >> DP_MBITS) == 0);

	r.parts.sign = s;
	r.parts.bexp = bx;
	r.parts.mant = m;
	return r;
}

extern int ieee754dp_isnan(ieee754dp);
extern int ieee754dp_issnan(ieee754dp);
extern int ieee754si_xcpt(int, const char *, ...);
extern s64 ieee754di_xcpt(s64, const char *, ...);
extern ieee754dp ieee754dp_xcpt(ieee754dp, const char *, ...);
extern ieee754dp ieee754dp_nanxcpt(ieee754dp, const char *, ...);
extern ieee754dp ieee754dp_bestnan(ieee754dp, ieee754dp);
extern ieee754dp ieee754dp_format(int, int, u64);


#define DPNORMRET2(s, e, m, name, a0, a1) \
{ \
    ieee754dp V = ieee754dp_format(s, e, m); \
    if(TSTX()) \
      return ieee754dp_xcpt(V, name, a0, a1); \
    else \
      return V; \
}

#define DPNORMRET1(s, e, m, name, a0)  DPNORMRET2(s, e, m, name, a0, a0)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* IEEE754 floating point
	3	* double precision internal header file
	4	*/
	5	/*
	6	* MIPS floating point support
	7	* Copyright (C) 1994-2000 Algorithmics Ltd.
	8	* http://www.algor.co.uk
	9	*
	10	* ########################################################################
	11	*
	12	* This program is free software; you can distribute it and/or modify it
	13	* under the terms of the GNU General Public License (Version 2) as
	14	* published by the Free Software Foundation.
	15	*
	16	* This program is distributed in the hope it will be useful, but WITHOUT
	17	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	18	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	19	* for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License along
	22	* with this program; if not, write to the Free Software Foundation, Inc.,
	23	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	24	*
	25	* ########################################################################
	26	*/
	27
	28
	29	#include "ieee754int.h"
	30
	31	#define assert(expr) ((void)0)
	32
	33	/* 3bit extended double precision sticky right shift */
	34	#define XDPSRS(v,rs) \
	35	((rs > (DP_MBITS+3))?1:((v) >> (rs)) \| ((v) << (64-(rs)) != 0))
	36
	37	#define XDPSRSX1() \
	38	(xe++, (xm = (xm >> 1) \| (xm & 1)))
	39
	40	#define XDPSRS1(v) \
	41	(((v) >> 1) \| ((v) & 1))
	42
	43	/* convert denormal to normalized with extended exponent */
	44	#define DPDNORMx(m,e) \
	45	while( (m >> DP_MBITS) == 0) { m <<= 1; e--; }
21a151d8 RB	46	#define DPDNORMX DPDNORMx(xm, xe)
21a151d8 RB	47	#define DPDNORMY DPDNORMx(ym, ye)
1da177e4	48
389310e2	49	static inline ieee754dp builddp(int s, int bx, u64 m)
1da177e4 LT	50	{
	51	ieee754dp r;
	52
	53	assert((s) == 0 \|\| (s) == 1);
	54	assert((bx) >= DP_EMIN - 1 + DP_EBIAS
	55	&& (bx) <= DP_EMAX + 1 + DP_EBIAS);
	56	assert(((m) >> DP_MBITS) == 0);
	57
	58	r.parts.sign = s;
	59	r.parts.bexp = bx;
	60	r.parts.mant = m;
	61	return r;
	62	}
	63
	64	extern int ieee754dp_isnan(ieee754dp);
	65	extern int ieee754dp_issnan(ieee754dp);
	66	extern int ieee754si_xcpt(int, const char *, ...);
	67	extern s64 ieee754di_xcpt(s64, const char *, ...);
	68	extern ieee754dp ieee754dp_xcpt(ieee754dp, const char *, ...);
	69	extern ieee754dp ieee754dp_nanxcpt(ieee754dp, const char *, ...);
	70	extern ieee754dp ieee754dp_bestnan(ieee754dp, ieee754dp);
	71	extern ieee754dp ieee754dp_format(int, int, u64);
	72
	73
21a151d8	74	#define DPNORMRET2(s, e, m, name, a0, a1) \
1da177e4	75	{ \
21a151d8	76	ieee754dp V = ieee754dp_format(s, e, m); \
1da177e4	77	if(TSTX()) \
21a151d8	78	return ieee754dp_xcpt(V, name, a0, a1); \
1da177e4 LT	79	else \
	80	return V; \
	81	}
	82
21a151d8	83	#define DPNORMRET1(s, e, m, name, a0) DPNORMRET2(s, e, m, name, a0, a0)