arch/mips/math-emu/dp_cmp.c

   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  * 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 "ieee754dp.h"
  29
  30 int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cmp, int sig)
  31 {
  32         COMPXDP;
  33         COMPYDP;
  34
  35         EXPLODEXDP;
  36         EXPLODEYDP;
  37         FLUSHXDP;
  38         FLUSHYDP;
  39         CLEARCX;        /* Even clear inexact flag here */
  40
  41         if (ieee754dp_isnan(x) || ieee754dp_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                 s64 vx = x.bits;
  53                 s64 vy = y.bits;
  54
  55                 if (vx < 0)
  56                         vx = -vx ^ DP_SIGN_BIT;
  57                 if (vy < 0)
  58                         vy = -vy ^ DP_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 }