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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgcc/] [soft-fp/] [op-8.h] - Blame information for rev 834

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1 734 jeremybenn
/* Software floating-point emulation.
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   Basic eight-word fraction declaration and manipulation.
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   Copyright (C) 1997,1998,1999,2006 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Richard Henderson (rth@cygnus.com),
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                  Jakub Jelinek (jj@ultra.linux.cz) and
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                  Peter Maydell (pmaydell@chiark.greenend.org.uk).
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   In addition to the permissions in the GNU Lesser General Public
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   License, the Free Software Foundation gives you unlimited
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   permission to link the compiled version of this file into
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   combinations with other programs, and to distribute those
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   combinations without any restriction coming from the use of this
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   file.  (The Lesser General Public License restrictions do apply in
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   other respects; for example, they cover modification of the file,
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   and distribution when not linked into a combine executable.)
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, write to the Free
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   Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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/* We need just a few things from here for op-4, if we ever need some
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   other macros, they can be added. */
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#define _FP_FRAC_DECL_8(X)      _FP_W_TYPE X##_f[8]
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#define _FP_FRAC_HIGH_8(X)      (X##_f[7])
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#define _FP_FRAC_LOW_8(X)       (X##_f[0])
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#define _FP_FRAC_WORD_8(X,w)    (X##_f[w])
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#define _FP_FRAC_SLL_8(X,N)                                             \
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  do {                                                                  \
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    _FP_I_TYPE _up, _down, _skip, _i;                                   \
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    _skip = (N) / _FP_W_TYPE_SIZE;                                      \
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    _up = (N) % _FP_W_TYPE_SIZE;                                        \
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    _down = _FP_W_TYPE_SIZE - _up;                                      \
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    if (!_up)                                                           \
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      for (_i = 7; _i >= _skip; --_i)                                   \
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        X##_f[_i] = X##_f[_i-_skip];                                    \
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    else                                                                \
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      {                                                                 \
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        for (_i = 7; _i > _skip; --_i)                                  \
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          X##_f[_i] = X##_f[_i-_skip] << _up                            \
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                      | X##_f[_i-_skip-1] >> _down;                     \
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        X##_f[_i--] = X##_f[0] << _up;                                  \
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      }                                                                 \
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    for (; _i >= 0; --_i)                                                \
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      X##_f[_i] = 0;                                                    \
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  } while (0)
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#define _FP_FRAC_SRL_8(X,N)                                             \
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  do {                                                                  \
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    _FP_I_TYPE _up, _down, _skip, _i;                                   \
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    _skip = (N) / _FP_W_TYPE_SIZE;                                      \
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    _down = (N) % _FP_W_TYPE_SIZE;                                      \
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    _up = _FP_W_TYPE_SIZE - _down;                                      \
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    if (!_down)                                                         \
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      for (_i = 0; _i <= 7-_skip; ++_i)                                  \
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        X##_f[_i] = X##_f[_i+_skip];                                    \
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    else                                                                \
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      {                                                                 \
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        for (_i = 0; _i < 7-_skip; ++_i)                         \
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          X##_f[_i] = X##_f[_i+_skip] >> _down                          \
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                      | X##_f[_i+_skip+1] << _up;                       \
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        X##_f[_i++] = X##_f[7] >> _down;                                \
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      }                                                                 \
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    for (; _i < 8; ++_i)                                                \
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      X##_f[_i] = 0;                                                    \
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  } while (0)
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/* Right shift with sticky-lsb.
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 * What this actually means is that we do a standard right-shift,
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 * but that if any of the bits that fall off the right hand side
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 * were one then we always set the LSbit.
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 */
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#define _FP_FRAC_SRS_8(X,N,size)                                        \
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  do {                                                                  \
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    _FP_I_TYPE _up, _down, _skip, _i;                                   \
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    _FP_W_TYPE _s;                                                      \
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    _skip = (N) / _FP_W_TYPE_SIZE;                                      \
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    _down = (N) % _FP_W_TYPE_SIZE;                                      \
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    _up = _FP_W_TYPE_SIZE - _down;                                      \
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    for (_s = _i = 0; _i < _skip; ++_i)                                  \
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      _s |= X##_f[_i];                                                  \
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    if (!_down)                                                         \
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      for (_i = 0; _i <= 7-_skip; ++_i)                                  \
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        X##_f[_i] = X##_f[_i+_skip];                                    \
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    else                                                                \
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      {                                                                 \
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        _s |= X##_f[_i] << _up;                                         \
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        for (_i = 0; _i < 7-_skip; ++_i)                         \
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          X##_f[_i] = X##_f[_i+_skip] >> _down                          \
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                      | X##_f[_i+_skip+1] << _up;                       \
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        X##_f[_i++] = X##_f[7] >> _down;                                \
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      }                                                                 \
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    for (; _i < 8; ++_i)                                                \
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      X##_f[_i] = 0;                                                    \
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    /* don't fix the LSB until the very end when we're sure f[0] is stable */   \
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    X##_f[0] |= (_s != 0);                                              \
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  } while (0)
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