LXR linux/arch/mips/math-emu/sp

   1/* IEEE754 floating point arithmetic
   2 * single precision
   3 */
   4/*
   5 * MIPS floating point support
   6 * Copyright (C) 1994-2000 Algorithmics Ltd.
   7 *
   8 *  This program is free software; you can distribute it and/or modify it
   9 *  under the terms of the GNU General Public License (Version 2) as
  10 *  published by the Free Software Foundation.
  11 *
  12 *  This program is distributed in the hope it will be useful, but WITHOUT
  13 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 *  for more details.
  16 *
  17 *  You should have received a copy of the GNU General Public License along
  18 *  with this program; if not, write to the Free Software Foundation, Inc.,
  19 *  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
  20 */
  21
  22#include "ieee754sp.h"
  23
  24int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cmp, int sig)
  25{
  26        int vx;
  27        int vy;
  28
  29        COMPXSP;
  30        COMPYSP;
  31
  32        EXPLODEXSP;
  33        EXPLODEYSP;
  34        FLUSHXSP;
  35        FLUSHYSP;
  36        ieee754_clearcx();      /* Even clear inexact flag here */
  37
  38        if (ieee754_class_nan(xc) || ieee754_class_nan(yc)) {
  39                if (sig ||
  40                    xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN)
  41                        ieee754_setcx(IEEE754_INVALID_OPERATION);
  42                return (cmp & IEEE754_CUN) != 0;
  43        } else {
  44                vx = x.bits;
  45                vy = y.bits;
  46
  47                if (vx < 0)
  48                        vx = -vx ^ SP_SIGN_BIT;
  49                if (vy < 0)
  50                        vy = -vy ^ SP_SIGN_BIT;
  51
  52                if (vx < vy)
  53                        return (cmp & IEEE754_CLT) != 0;
  54                else if (vx == vy)
  55                        return (cmp & IEEE754_CEQ) != 0;
  56                else
  57                        return (cmp & IEEE754_CGT) != 0;
  58        }
  59}
  60