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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/math-emu/sp_fdp.c
10818 views
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/* IEEE754 floating point arithmetic

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 * single precision

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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 "ieee754sp.h"

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ieee754sp ieee754sp_fdp(ieee754dp x)

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{

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	COMPXDP;

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	ieee754sp nan;

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	EXPLODEXDP;

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	CLEARCX;

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	FLUSHXDP;

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	switch (xc) {

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	case IEEE754_CLASS_SNAN:

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		SETCX(IEEE754_INVALID_OPERATION);

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		return ieee754sp_nanxcpt(ieee754sp_indef(), "fdp");

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	case IEEE754_CLASS_QNAN:

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		nan = buildsp(xs, SP_EMAX + 1 + SP_EBIAS, (u32)

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				(xm >> (DP_MBITS - SP_MBITS)));

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		if (!ieee754sp_isnan(nan))

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			nan = ieee754sp_indef();

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		return ieee754sp_nanxcpt(nan, "fdp", x);

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	case IEEE754_CLASS_INF:

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		return ieee754sp_inf(xs);

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	case IEEE754_CLASS_ZERO:

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		return ieee754sp_zero(xs);

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	case IEEE754_CLASS_DNORM:

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		/* can't possibly be sp representable */

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		SETCX(IEEE754_UNDERFLOW);

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		SETCX(IEEE754_INEXACT);

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		if ((ieee754_csr.rm == IEEE754_RU && !xs) ||

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				(ieee754_csr.rm == IEEE754_RD && xs))

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			return ieee754sp_xcpt(ieee754sp_mind(xs), "fdp", x);

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		return ieee754sp_xcpt(ieee754sp_zero(xs), "fdp", x);

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	case IEEE754_CLASS_NORM:

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		break;

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	}

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	{

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		u32 rm;

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		/* convert from DP_MBITS to SP_MBITS+3 with sticky right shift

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		 */

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		rm = (xm >> (DP_MBITS - (SP_MBITS + 3))) |

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		    ((xm << (64 - (DP_MBITS - (SP_MBITS + 3)))) != 0);

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		SPNORMRET1(xs, xe, rm, "fdp", x);

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	}

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}

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