text: /* IEEE754 floating point arithmetic
   * double precision: common utilities
   */
  /*
   * 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 "ieee754dp.h"
  
  s64 ieee754dp_tlong(ieee754dp x)
  {
  	COMPXDP;
  
  	CLEARCX;
  
  	EXPLODEXDP;
  	FLUSHXDP;
  
  	switch (xc) {
  	case IEEE754_CLASS_SNAN:
  	case IEEE754_CLASS_QNAN:
  	case IEEE754_CLASS_INF:
  		SETCX(IEEE754_INVALID_OPERATION);
  		return ieee754di_xcpt(ieee754di_indef(), "dp_tlong", x);
  	case IEEE754_CLASS_ZERO:
  		return 0;
  	case IEEE754_CLASS_DNORM:
  	case IEEE754_CLASS_NORM:
  		break;
  	}
  	if (xe >= 63) {
  		/* look for valid corner case */
  		if (xe == 63 && xs && xm == DP_HIDDEN_BIT)
  			return -0x8000000000000000LL;
  		/* Set invalid. We will only use overflow for floating
  		   point overflow */
  		SETCX(IEEE754_INVALID_OPERATION);
  		return ieee754di_xcpt(ieee754di_indef(), "dp_tlong", x);
  	}
  	/* oh gawd */
  	if (xe > DP_MBITS) {
  		xm <<= xe - DP_MBITS;
  	} else if (xe < DP_MBITS) {
  		u64 residue;
  		int round;
  		int sticky;
  		int odd;
  
  		if (xe < -1) {
  			residue = xm;
  			round = 0;
  			sticky = residue != 0;
  			xm = 0;
  		} else {
  			/* Shifting a u64 64 times does not work,
  			* so we do it in two steps. Be aware that xe
  			* may be -1 */
  			residue = xm << (xe + 1);
  			residue <<= 63 - DP_MBITS;
  			round = (residue >> 63) != 0;
  			sticky = (residue << 1) != 0;
  			xm >>= DP_MBITS - xe;
  		}
  		odd = (xm & 0x1) != 0x0;
  		switch (ieee754_csr.rm) {
  		case IEEE754_RN:
  			if (round && (sticky || odd))
  				xm++;
  			break;
  		case IEEE754_RZ:
  			break;
  		case IEEE754_RU:	/* toward +Infinity */
  			if ((round || sticky) && !xs)
  				xm++;
  			break;
  		case IEEE754_RD:	/* toward -Infinity */
  			if ((round || sticky) && xs)
  				xm++;
  			break;
  		}
  		if ((xm >> 63) != 0) {
  			/* This can happen after rounding */
  			SETCX(IEEE754_INVALID_OPERATION);
  			return ieee754di_xcpt(ieee754di_indef(), "dp_tlong", x);
  		}
  		if (round || sticky)
  			SETCX(IEEE754_INEXACT);
  	}
  	if (xs)
  		return -xm;
  	else
  		return xm;
  }
  
  
  u64 ieee754dp_tulong(ieee754dp x)
  {
  	ieee754dp hb = ieee754dp_1e63();
  
  	/* what if x < 0 ?? */
  	if (ieee754dp_lt(x, hb))
  		return (u64) ieee754dp_tlong(x);
  
  	return (u64) ieee754dp_tlong(ieee754dp_sub(x, hb)) |
  	    (1ULL << 63);
  }
  