aboutsummaryrefslogtreecommitdiff
path: root/soft-fp/op-8.h
blob: 78443b3b3bb40843af9dd089f8b1eea13c5a17c4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
/* Software floating-point emulation.
   Basic eight-word fraction declaration and manipulation.
   Copyright (C) 1997-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson (rth@cygnus.com),
		  Jakub Jelinek (jj@ultra.linux.cz) and
		  Peter Maydell (pmaydell@chiark.greenend.org.uk).

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   In addition to the permissions in the GNU Lesser General Public
   License, the Free Software Foundation gives you unlimited
   permission to link the compiled version of this file into
   combinations with other programs, and to distribute those
   combinations without any restriction coming from the use of this
   file.  (The Lesser General Public License restrictions do apply in
   other respects; for example, they cover modification of the file,
   and distribution when not linked into a combine executable.)

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef SOFT_FP_OP_8_H
#define SOFT_FP_OP_8_H	1

/* We need just a few things from here for op-4, if we ever need some
   other macros, they can be added.  */
#define _FP_FRAC_DECL_8(X)	_FP_W_TYPE X##_f[8]
#define _FP_FRAC_SET_8(X, I)    __FP_FRAC_SET_8 (X, I)
#define _FP_FRAC_HIGH_8(X)	(X##_f[7])
#define _FP_FRAC_LOW_8(X)	(X##_f[0])
#define _FP_FRAC_WORD_8(X, w)	(X##_f[w])

#define _FP_FRAC_SLL_8(X, N)						\
  do									\
    {									\
      _FP_I_TYPE _FP_FRAC_SLL_8_up, _FP_FRAC_SLL_8_down;		\
      _FP_I_TYPE _FP_FRAC_SLL_8_skip, _FP_FRAC_SLL_8_i;			\
      _FP_FRAC_SLL_8_skip = (N) / _FP_W_TYPE_SIZE;			\
      _FP_FRAC_SLL_8_up = (N) % _FP_W_TYPE_SIZE;			\
      _FP_FRAC_SLL_8_down = _FP_W_TYPE_SIZE - _FP_FRAC_SLL_8_up;	\
      if (!_FP_FRAC_SLL_8_up)						\
	for (_FP_FRAC_SLL_8_i = 7;					\
	     _FP_FRAC_SLL_8_i >= _FP_FRAC_SLL_8_skip;			\
	     --_FP_FRAC_SLL_8_i)					\
	  X##_f[_FP_FRAC_SLL_8_i]					\
	    = X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip];		\
      else								\
	{								\
	  for (_FP_FRAC_SLL_8_i = 7;					\
	       _FP_FRAC_SLL_8_i > _FP_FRAC_SLL_8_skip;			\
	       --_FP_FRAC_SLL_8_i)					\
	    X##_f[_FP_FRAC_SLL_8_i]					\
	      = ((X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip]		\
		  << _FP_FRAC_SLL_8_up)					\
		 | (X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip-1]	\
		    >> _FP_FRAC_SLL_8_down));				\
	  X##_f[_FP_FRAC_SLL_8_i--] = X##_f[0] << _FP_FRAC_SLL_8_up;	\
	}								\
      for (; _FP_FRAC_SLL_8_i >= 0; --_FP_FRAC_SLL_8_i)			\
	X##_f[_FP_FRAC_SLL_8_i] = 0;					\
    }									\
  while (0)

#define _FP_FRAC_SRL_8(X, N)						\
  do									\
    {									\
      _FP_I_TYPE _FP_FRAC_SRL_8_up, _FP_FRAC_SRL_8_down;		\
      _FP_I_TYPE _FP_FRAC_SRL_8_skip, _FP_FRAC_SRL_8_i;			\
      _FP_FRAC_SRL_8_skip = (N) / _FP_W_TYPE_SIZE;			\
      _FP_FRAC_SRL_8_down = (N) % _FP_W_TYPE_SIZE;			\
      _FP_FRAC_SRL_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRL_8_down;	\
      if (!_FP_FRAC_SRL_8_down)						\
	for (_FP_FRAC_SRL_8_i = 0;					\
	     _FP_FRAC_SRL_8_i <= 7-_FP_FRAC_SRL_8_skip;			\
	     ++_FP_FRAC_SRL_8_i)					\
	  X##_f[_FP_FRAC_SRL_8_i]					\
	    = X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip];		\
      else								\
	{								\
	  for (_FP_FRAC_SRL_8_i = 0;					\
	       _FP_FRAC_SRL_8_i < 7-_FP_FRAC_SRL_8_skip;		\
	       ++_FP_FRAC_SRL_8_i)					\
	    X##_f[_FP_FRAC_SRL_8_i]					\
	      = ((X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip]		\
		  >> _FP_FRAC_SRL_8_down)				\
		 | (X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip+1]	\
		    << _FP_FRAC_SRL_8_up));				\
	  X##_f[_FP_FRAC_SRL_8_i++] = X##_f[7] >> _FP_FRAC_SRL_8_down;	\
	}								\
      for (; _FP_FRAC_SRL_8_i < 8; ++_FP_FRAC_SRL_8_i)			\
	X##_f[_FP_FRAC_SRL_8_i] = 0;					\
    }									\
  while (0)


/* Right shift with sticky-lsb.
   What this actually means is that we do a standard right-shift,
   but that if any of the bits that fall off the right hand side
   were one then we always set the LSbit.  */
#define _FP_FRAC_SRS_8(X, N, size)					\
  do									\
    {									\
      _FP_I_TYPE _FP_FRAC_SRS_8_up, _FP_FRAC_SRS_8_down;		\
      _FP_I_TYPE _FP_FRAC_SRS_8_skip, _FP_FRAC_SRS_8_i;			\
      _FP_W_TYPE _FP_FRAC_SRS_8_s;					\
      _FP_FRAC_SRS_8_skip = (N) / _FP_W_TYPE_SIZE;			\
      _FP_FRAC_SRS_8_down = (N) % _FP_W_TYPE_SIZE;			\
      _FP_FRAC_SRS_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRS_8_down;	\
      for (_FP_FRAC_SRS_8_s = _FP_FRAC_SRS_8_i = 0;			\
	   _FP_FRAC_SRS_8_i < _FP_FRAC_SRS_8_skip;			\
	   ++_FP_FRAC_SRS_8_i)						\
	_FP_FRAC_SRS_8_s |= X##_f[_FP_FRAC_SRS_8_i];			\
      if (!_FP_FRAC_SRS_8_down)						\
	for (_FP_FRAC_SRS_8_i = 0;					\
	     _FP_FRAC_SRS_8_i <= 7-_FP_FRAC_SRS_8_skip;			\
	     ++_FP_FRAC_SRS_8_i)					\
	  X##_f[_FP_FRAC_SRS_8_i]					\
	    = X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip];		\
      else								\
	{								\
	  _FP_FRAC_SRS_8_s						\
	    |= X##_f[_FP_FRAC_SRS_8_i] << _FP_FRAC_SRS_8_up;		\
	  for (_FP_FRAC_SRS_8_i = 0;					\
	       _FP_FRAC_SRS_8_i < 7-_FP_FRAC_SRS_8_skip;		\
	       ++_FP_FRAC_SRS_8_i)					\
	    X##_f[_FP_FRAC_SRS_8_i]					\
	      = ((X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip]		\
		  >> _FP_FRAC_SRS_8_down)				\
		 | (X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip+1]	\
		    << _FP_FRAC_SRS_8_up));				\
	  X##_f[_FP_FRAC_SRS_8_i++] = X##_f[7] >> _FP_FRAC_SRS_8_down;	\
	}								\
      for (; _FP_FRAC_SRS_8_i < 8; ++_FP_FRAC_SRS_8_i)			\
	X##_f[_FP_FRAC_SRS_8_i] = 0;					\
      /* Don't fix the LSB until the very end when we're sure f[0] is	\
	 stable.  */							\
      X##_f[0] |= (_FP_FRAC_SRS_8_s != 0);				\
    }									\
  while (0)

#define _FP_FRAC_ADD_8(R, X, Y)                                             \
  do                                                                        \
    {                                                                       \
      _FP_W_TYPE _FP_FRAC_ADD_8_c = 0;                                      \
      _FP_I_TYPE _FP_FRAC_ADD_8_i;                                          \
      for (_FP_FRAC_ADD_8_i = 0; _FP_FRAC_ADD_8_i < 8; ++_FP_FRAC_ADD_8_i)  \
        {                                                                   \
          R##_f[_FP_FRAC_ADD_8_i]                                           \
            = (X##_f[_FP_FRAC_ADD_8_i] + Y##_f[_FP_FRAC_ADD_8_i]            \
               + _FP_FRAC_ADD_8_c);                                         \
          _FP_FRAC_ADD_8_c                                                  \
            = (_FP_FRAC_ADD_8_c                                             \
               ? R##_f[_FP_FRAC_ADD_8_i] <= X##_f[_FP_FRAC_ADD_8_i]         \
               : R##_f[_FP_FRAC_ADD_8_i] < X##_f[_FP_FRAC_ADD_8_i]);        \
        }                                                                   \
    }                                                                       \
  while (0)

#define _FP_FRAC_SUB_8(R, X, Y)                                             \
  do                                                                        \
    {                                                                       \
      _FP_W_TYPE _FP_FRAC_SUB_8_tmp[8];                                     \
      _FP_W_TYPE _FP_FRAC_SUB_8_c = 0;                                      \
      _FP_I_TYPE _FP_FRAC_SUB_8_i;                                          \
      for (_FP_FRAC_SUB_8_i = 0; _FP_FRAC_SUB_8_i < 8; ++_FP_FRAC_SUB_8_i)  \
        {                                                                   \
          _FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i]                              \
            = (X##_f[_FP_FRAC_SUB_8_i] - Y##_f[_FP_FRAC_SUB_8_i]            \
               - _FP_FRAC_SUB_8_c);                                         \
          _FP_FRAC_SUB_8_c                                                  \
            = (_FP_FRAC_SUB_8_c                                             \
               ? (_FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i]                      \
                  >= X##_f[_FP_FRAC_SUB_8_i])                               \
               : (_FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i]                      \
                  > X##_f[_FP_FRAC_SUB_8_i]));                              \
        }                                                                   \
      for (_FP_FRAC_SUB_8_i = 0; _FP_FRAC_SUB_8_i < 8; ++_FP_FRAC_SUB_8_i)  \
        R##_f[_FP_FRAC_SUB_8_i] = _FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i];     \
    }                                                                       \
  while (0)

#define _FP_FRAC_CLZ_8(R, X)                                                \
  do                                                                        \
    {                                                                       \
      _FP_I_TYPE _FP_FRAC_CLZ_8_i;                                          \
      for (_FP_FRAC_CLZ_8_i = 7; _FP_FRAC_CLZ_8_i > 0; _FP_FRAC_CLZ_8_i--)  \
        if (X##_f[_FP_FRAC_CLZ_8_i])                                        \
          break;                                                            \
      __FP_CLZ ((R), X##_f[_FP_FRAC_CLZ_8_i]);                              \
      (R) += _FP_W_TYPE_SIZE * (7 - _FP_FRAC_CLZ_8_i);                      \
    }                                                                       \
  while (0)

#define _FP_MINFRAC_8   0, 0, 0, 0, 0, 0, 0, 1

#define _FP_FRAC_NEGP_8(X)      ((_FP_WS_TYPE) X##_f[7] < 0)
#define _FP_FRAC_ZEROP_8(X)                                             \
  ((X##_f[0] | X##_f[1] | X##_f[2] | X##_f[3]                           \
    | X##_f[4] | X##_f[5] | X##_f[6] | X##_f[7]) == 0)
#define _FP_FRAC_HIGHBIT_DW_8(fs, X)                                    \
  (_FP_FRAC_HIGH_DW_##fs (X) & _FP_HIGHBIT_DW_##fs)

#define _FP_FRAC_COPY_4_8(D, S)                           \
  do                                                      \
    {                                                     \
      D##_f[0] = S##_f[0];                                \
      D##_f[1] = S##_f[1];                                \
      D##_f[2] = S##_f[2];                                \
      D##_f[3] = S##_f[3];                                \
    }                                                     \
  while (0)

#define _FP_FRAC_COPY_8_4(D, S)                           \
  do                                                      \
    {                                                     \
      D##_f[0] = S##_f[0];                                \
      D##_f[1] = S##_f[1];                                \
      D##_f[2] = S##_f[2];                                \
      D##_f[3] = S##_f[3];                                \
      D##_f[4] = D##_f[5] = D##_f[6] = D##_f[7]= 0;       \
    }                                                     \
  while (0)

#define __FP_FRAC_SET_8(X, I7, I6, I5, I4, I3, I2, I1, I0)             \
  (X##_f[7] = I7, X##_f[6] = I6, X##_f[5] = I5, X##_f[4] = I4,         \
   X##_f[3] = I3, X##_f[2] = I2, X##_f[1] = I1, X##_f[0] = I0)

#endif /* !SOFT_FP_OP_8_H */