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  *  This program is free software; you can distribute it and/or modify it
   9  *  under the terms of the GNU General Public License (Version 2) as
  10  *  published by the Free Software Foundation.
  11  *
  12  *  This program is distributed in the hope it will be useful, but WITHOUT
  13  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  *  for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
  20  */
  21
  22 #include "ieee754dp.h"
  23
  24 union ieee754dp ieee754dp_neg(union ieee754dp x)
  25 {
  26         union ieee754dp y;
  27
  28         if (ieee754_csr.abs2008) {
  29                 y = x;
  30                 DPSIGN(y) = !DPSIGN(x);
  31         } else {
  32                 unsigned int oldrm;
  33
  34                 oldrm = ieee754_csr.rm;
  35                 ieee754_csr.rm = FPU_CSR_RD;
  36                 y = ieee754dp_sub(ieee754dp_zero(0), x);
  37                 ieee754_csr.rm = oldrm;
  38         }
  39         return y;
  40 }
  41
  42 union ieee754dp ieee754dp_abs(union ieee754dp x)
  43 {
  44         union ieee754dp y;
  45
  46         if (ieee754_csr.abs2008) {
  47                 y = x;
  48                 DPSIGN(y) = 0;
  49         } else {
  50                 unsigned int oldrm;
  51
  52                 oldrm = ieee754_csr.rm;
  53                 ieee754_csr.rm = FPU_CSR_RD;
  54                 if (DPSIGN(x))
  55                         y = ieee754dp_sub(ieee754dp_zero(0), x);
  56                 else
  57                         y = ieee754dp_add(ieee754dp_zero(0), x);
  58                 ieee754_csr.rm = oldrm;
  59         }
  60         return y;
  61 }