arch/mips/math-emu/dp_simple.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 union ieee754dp ieee754dp_neg(union ieee754dp x)
  30 {
  31         COMPXDP;
  32
  33         EXPLODEXDP;
  34         ieee754_clearcx();
  35         FLUSHXDP;
  36
  37         /*
  38          * Invert the sign ALWAYS to prevent an endless recursion on
  39          * pow() in libc.
  40          */
  41         /* quick fix up */
  42         DPSIGN(x) ^= 1;
  43
  44         if (xc == IEEE754_CLASS_SNAN) {
  45                 union ieee754dp y = ieee754dp_indef();
  46                 ieee754_setcx(IEEE754_INVALID_OPERATION);
  47                 DPSIGN(y) = DPSIGN(x);
  48                 return ieee754dp_nanxcpt(y);
  49         }
  50
  51         return x;
  52 }
  53
  54
  55 union ieee754dp ieee754dp_abs(union ieee754dp x)
  56 {
  57         COMPXDP;
  58
  59         EXPLODEXDP;
  60         ieee754_clearcx();
  61         FLUSHXDP;
  62
  63         /* Clear sign ALWAYS, irrespective of NaN */
  64         DPSIGN(x) = 0;
  65
  66         if (xc == IEEE754_CLASS_SNAN) {
  67                 ieee754_setcx(IEEE754_INVALID_OPERATION);
  68                 return ieee754dp_nanxcpt(ieee754dp_indef());
  69         }
  70
  71         return x;
  72 }