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  *
   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
  29 int 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 }