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 * http://www.algor.co.uk
   8 *
   9 * ########################################################################
  10 *
  11 *  This program is free software; you can distribute it and/or modify it
  12 *  under the terms of the GNU General Public License (Version 2) as
  13 *  published by the Free Software Foundation.
  14 *
  15 *  This program is distributed in the hope it will be useful, but WITHOUT
  16 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18 *  for more details.
  19 *
  20 *  You should have received a copy of the GNU General Public License along
  21 *  with this program; if not, write to the Free Software Foundation, Inc.,
  22 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  23 *
  24 * ########################################################################
  25 */
  26
  27
  28#include "ieee754sp.h"
  29
  30int ieee754sp_cmp(ieee754sp x, ieee754sp y, int cmp, int sig)
  31{
  32        COMPXSP;
  33        COMPYSP;
  34
  35        EXPLODEXSP;
  36        EXPLODEYSP;
  37        FLUSHXSP;
  38        FLUSHYSP;
  39        CLEARCX;        /* Even clear inexact flag here */
  40
  41        if (ieee754sp_isnan(x) || ieee754sp_isnan(y)) {
  42                if (sig || xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN)
  43                        SETCX(IEEE754_INVALID_OPERATION);
  44                if (cmp & IEEE754_CUN)
  45                        return 1;
  46                if (cmp & (IEEE754_CLT | IEEE754_CGT)) {
  47                        if (sig && SETANDTESTCX(IEEE754_INVALID_OPERATION))
  48                                return ieee754si_xcpt(0, "fcmpf", x);
  49                }
  50                return 0;
  51        } else {
  52                int vx = x.bits;
  53                int vy = y.bits;
  54
  55                if (vx < 0)
  56                        vx = -vx ^ SP_SIGN_BIT;
  57                if (vy < 0)
  58                        vy = -vy ^ SP_SIGN_BIT;
  59
  60                if (vx < vy)
  61                        return (cmp & IEEE754_CLT) != 0;
  62                else if (vx == vy)
  63                        return (cmp & IEEE754_CEQ) != 0;
  64                else
  65                        return (cmp & IEEE754_CGT) != 0;
  66        }
  67}
  68