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

   1/* IEEE754 floating point arithmetic
   2 * double precision: common utilities
   3 */
   4/*
   5 * MIPS floating point support
   6 * Copyright (C) 1994-2000 Algorithmics Ltd.
   7 *
   8 * ########################################################################
   9 *
  10 *  This program is free software; you can distribute it and/or modify it
  11 *  under the terms of the GNU General Public License (Version 2) as
  12 *  published by the Free Software Foundation.
  13 *
  14 *  This program is distributed in the hope it will be useful, but WITHOUT
  15 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 *  for more details.
  18 *
  19 *  You should have received a copy of the GNU General Public License along
  20 *  with this program; if not, write to the Free Software Foundation, Inc.,
  21 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22 *
  23 * ########################################################################
  24 */
  25
  26
  27#include "ieee754dp.h"
  28
  29int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cmp, int sig)
  30{
  31        COMPXDP;
  32        COMPYDP;
  33
  34        EXPLODEXDP;
  35        EXPLODEYDP;
  36        FLUSHXDP;
  37        FLUSHYDP;
  38        CLEARCX;        /* Even clear inexact flag here */
  39
  40        if (ieee754dp_isnan(x) || ieee754dp_isnan(y)) {
  41                if (sig || xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN)
  42                        SETCX(IEEE754_INVALID_OPERATION);
  43                if (cmp & IEEE754_CUN)
  44                        return 1;
  45                if (cmp & (IEEE754_CLT | IEEE754_CGT)) {
  46                        if (sig && SETANDTESTCX(IEEE754_INVALID_OPERATION))
  47                                return ieee754si_xcpt(0, "fcmpf", x);
  48                }
  49                return 0;
  50        } else {
  51                s64 vx = x.bits;
  52                s64 vy = y.bits;
  53
  54                if (vx < 0)
  55                        vx = -vx ^ DP_SIGN_BIT;
  56                if (vy < 0)
  57                        vy = -vy ^ DP_SIGN_BIT;
  58
  59                if (vx < vy)
  60                        return (cmp & IEEE754_CLT) != 0;
  61                else if (vx == vy)
  62                        return (cmp & IEEE754_CEQ) != 0;
  63                else
  64                        return (cmp & IEEE754_CGT) != 0;
  65        }
  66}
  67