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arch/mips/math-emu/dp_scalb.c 1.45 KB
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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  /* IEEE754 floating point arithmetic
   * double precision: common utilities
   */
  /*
   * MIPS floating point support
   * Copyright (C) 1994-2000 Algorithmics Ltd.
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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   *
   * ########################################################################
   *
   *  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_scalb(ieee754dp x, int n)
  {
  	COMPXDP;
  
  	CLEARCX;
  
  	EXPLODEXDP;
  
  	switch (xc) {
  	case IEEE754_CLASS_SNAN:
  		return ieee754dp_nanxcpt(x, "scalb", x, n);
  	case IEEE754_CLASS_QNAN:
  	case IEEE754_CLASS_INF:
  	case IEEE754_CLASS_ZERO:
  		return x;
  	case IEEE754_CLASS_DNORM:
  		DPDNORMX;
  		break;
  	case IEEE754_CLASS_NORM:
  		break;
  	}
  	DPNORMRET2(xs, xe + n, xm << 3, "scalb", x, n);
  }
  
  
  ieee754dp ieee754dp_ldexp(ieee754dp x, int n)
  {
  	return ieee754dp_scalb(x, n);
  }