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

   1/* IEEE754 floating point arithmetic
   2 * single precision
   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 "ieee754sp.h"
  23
  24union ieee754sp ieee754sp_neg(union ieee754sp x)
  25{
  26        union ieee754sp y;
  27
  28        if (ieee754_csr.abs2008) {
  29                y = x;
  30                SPSIGN(y) = !SPSIGN(x);
  31        } else {
  32                unsigned int oldrm;
  33
  34                oldrm = ieee754_csr.rm;
  35                ieee754_csr.rm = FPU_CSR_RD;
  36                y = ieee754sp_sub(ieee754sp_zero(0), x);
  37                ieee754_csr.rm = oldrm;
  38        }
  39        return y;
  40}
  41
  42union ieee754sp ieee754sp_abs(union ieee754sp x)
  43{
  44        union ieee754sp y;
  45
  46        if (ieee754_csr.abs2008) {
  47                y = x;
  48                SPSIGN(y) = 0;
  49        } else {
  50                unsigned int oldrm;
  51
  52                oldrm = ieee754_csr.rm;
  53                ieee754_csr.rm = FPU_CSR_RD;
  54                if (SPSIGN(x))
  55                        y = ieee754sp_sub(ieee754sp_zero(0), x);
  56                else
  57                        y = ieee754sp_add(ieee754sp_zero(0), x);
  58                ieee754_csr.rm = oldrm;
  59        }
  60        return y;
  61}
  62