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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/math-emu/ieee754dp.h
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/*

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 * IEEE754 floating point

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 * double precision internal header file

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 */

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/*

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 * MIPS floating point support

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 * Copyright (C) 1994-2000 Algorithmics Ltd.

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 *

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 * ########################################################################

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 *

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 *  This program is free software; you can distribute it and/or modify it

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 *  under the terms of the GNU General Public License (Version 2) as

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 *  published by the Free Software Foundation.

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 *

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 *  This program is distributed in the hope it will be useful, but WITHOUT

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 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

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 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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 *  for more details.

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 *

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 *  You should have received a copy of the GNU General Public License along

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 *  with this program; if not, write to the Free Software Foundation, Inc.,

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 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.

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 *

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 * ########################################################################

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 */

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#include "ieee754int.h"

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#define assert(expr) ((void)0)

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/* 3bit extended double precision sticky right shift */

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#define XDPSRS(v,rs)	\

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  ((rs > (DP_MBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))

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#define XDPSRSX1() \

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  (xe++, (xm = (xm >> 1) | (xm & 1)))

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#define XDPSRS1(v)	\

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  (((v) >> 1) | ((v) & 1))

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/* convert denormal to normalized with extended exponent */

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#define DPDNORMx(m,e) \

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  while( (m >> DP_MBITS) == 0) { m <<= 1; e--; }

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#define DPDNORMX	DPDNORMx(xm, xe)

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#define DPDNORMY	DPDNORMx(ym, ye)

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

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{

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	ieee754dp r;

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	assert((s) == 0 || (s) == 1);

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	assert((bx) >= DP_EMIN - 1 + DP_EBIAS

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	       && (bx) <= DP_EMAX + 1 + DP_EBIAS);

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	assert(((m) >> DP_MBITS) == 0);

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	r.parts.sign = s;

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	r.parts.bexp = bx;

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	r.parts.mant = m;

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	return r;

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}

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extern int ieee754dp_isnan(ieee754dp);

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extern int ieee754dp_issnan(ieee754dp);

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extern int ieee754si_xcpt(int, const char *, ...);

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extern s64 ieee754di_xcpt(s64, const char *, ...);

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extern ieee754dp ieee754dp_xcpt(ieee754dp, const char *, ...);

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extern ieee754dp ieee754dp_nanxcpt(ieee754dp, const char *, ...);

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extern ieee754dp ieee754dp_bestnan(ieee754dp, ieee754dp);

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extern ieee754dp ieee754dp_format(int, int, u64);

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#define DPNORMRET2(s, e, m, name, a0, a1) \

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{ \

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    ieee754dp V = ieee754dp_format(s, e, m); \

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    if(TSTX()) \

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      return ieee754dp_xcpt(V, name, a0, a1); \

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    else \

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      return V; \

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}

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#define DPNORMRET1(s, e, m, name, a0)  DPNORMRET2(s, e, m, name, a0, a0)

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