OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [machmode.def] - Blame information for rev 707

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 684 jeremybenn
/* This file contains the definitions and documentation for the
2
   machine modes used in the GNU compiler.
3
   Copyright (C) 1987, 1992, 1994, 1997, 1998, 2000, 2003, 2004, 2005,
4
   2007, 2010  Free Software Foundation, Inc.
5
 
6
This file is part of GCC.
7
 
8
GCC is free software; you can redistribute it and/or modify it under
9
the terms of the GNU General Public License as published by the Free
10
Software Foundation; either version 3, or (at your option) any later
11
version.
12
 
13
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14
WARRANTY; without even the implied warranty of MERCHANTABILITY or
15
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16
for more details.
17
 
18
You should have received a copy of the GNU General Public License
19
along with GCC; see the file COPYING3.  If not see
20
.  */
21
 
22
 
23
/* This file defines all the MACHINE MODES used by GCC.
24
 
25
   A machine mode specifies a size and format of data
26
   at the machine level.
27
 
28
   Each RTL expression has a machine mode.
29
 
30
   At the syntax tree level, each ..._TYPE and each ..._DECL node
31
   has a machine mode which describes data of that type or the
32
   data of the variable declared.  */
33
 
34
/* This file is included by the genmodes program.  Its text is the
35
   body of a function.  Do not rely on this, it will change in the
36
   future.
37
 
38
   The following statements can be used in this file -- all have
39
   the form of a C macro call.  In their arguments:
40
 
41
   A CLASS argument must be one of the constants defined in
42
   mode-classes.def, less the leading MODE_ prefix; some statements
43
   that take CLASS arguments have restrictions on which classes are
44
   acceptable.  For instance, INT.
45
 
46
   A MODE argument must be the printable name of a machine mode,
47
   without quotation marks or trailing "mode".  For instance, SI.
48
 
49
   A PRECISION, BYTESIZE, or COUNT argument must be a positive integer
50
   constant.
51
 
52
   A FORMAT argument must be one of the real_mode_format structures
53
   declared in real.h, or else a literal 0.  Do not put a leading &
54
   on the argument.
55
 
56
   An EXPR argument must be a syntactically valid C expression.
57
   If an EXPR contains commas, you may need to write an extra pair of
58
   parentheses around it, so it appears to be a single argument to the
59
   statement.
60
 
61
   This file defines only those modes which are of use on almost all
62
   machines.  Other modes can be defined in the target-specific
63
   mode definition file, config/ARCH/ARCH-modes.def.
64
 
65
   Order matters in this file in so far as statements which refer to
66
   other modes must appear after the modes they refer to.  However,
67
   statements which do not refer to other modes may appear in any
68
   order.
69
 
70
     RANDOM_MODE (MODE);
71
        declares MODE to be of class RANDOM.
72
 
73
     CC_MODE (MODE);
74
        declares MODE to be of class CC.
75
 
76
     INT_MODE (MODE, BYTESIZE);
77
        declares MODE to be of class INT and BYTESIZE bytes wide.
78
        All of the bits of its representation are significant.
79
 
80
     FRACTIONAL_INT_MODE (MODE, PRECISION, BYTESIZE);
81
        declares MODE to be of class INT, BYTESIZE bytes wide in
82
        storage, but with only PRECISION significant bits.
83
 
84
     FLOAT_MODE (MODE, BYTESIZE, FORMAT);
85
        declares MODE to be of class FLOAT and BYTESIZE bytes wide,
86
        using floating point format FORMAT.
87
        All of the bits of its representation are significant.
88
 
89
     FRACTIONAL_FLOAT_MODE (MODE, PRECISION, BYTESIZE, FORMAT);
90
        declares MODE to be of class FLOAT, BYTESIZE bytes wide in
91
        storage, but with only PRECISION significant bits, using
92
        floating point format FORMAT.
93
 
94
     DECIMAL_FLOAT_MODE (MODE, BYTESIZE, FORMAT);
95
        declares MODE to be of class DECIMAL_FLOAT and BYTESIZE bytes
96
        wide.  All of the bits of its representation are significant.
97
 
98
     FRACTIONAL_DECIMAL_FLOAT_MODE (MODE, BYTESIZE, FORMAT);
99
        declares MODE to be of class DECIMAL_FLOAT and BYTESIZE bytes
100
        wide.  All of the bits of its representation are significant.
101
 
102
     FRACT_MODE (MODE, BYTESIZE, FBIT);
103
        declares MODE to be of class FRACT and BYTESIZE bytes wide
104
        with FBIT fractional bits.  There may be padding bits.
105
 
106
     UFRACT_MODE (MODE, BYTESIZE, FBIT);
107
        declares MODE to be of class UFRACT and BYTESIZE bytes wide
108
        with FBIT fractional bits.  There may be padding bits.
109
 
110
     ACCUM_MODE (MODE, BYTESIZE, IBIT, FBIT);
111
        declares MODE to be of class ACCUM and BYTESIZE bytes wide
112
        with IBIT integral bits and FBIT fractional bits.
113
        There may be padding bits.
114
 
115
     UACCUM_MODE (MODE, BYTESIZE, IBIT, FBIT);
116
        declares MODE to be of class UACCUM and BYTESIZE bytes wide
117
        with IBIT integral bits and FBIT fractional bits.
118
        There may be padding bits.
119
 
120
     RESET_FLOAT_FORMAT (MODE, FORMAT);
121
        changes the format of MODE, which must be class FLOAT,
122
        to FORMAT.  Use in an ARCH-modes.def to reset the format
123
        of one of the float modes defined in this file.
124
 
125
     PARTIAL_INT_MODE (MODE);
126
        declares a mode of class PARTIAL_INT with the same size as
127
        MODE (which must be an INT mode).  The name of the new mode
128
        is made by prefixing a P to the name MODE.  This statement
129
        may grow a PRECISION argument in the future.
130
 
131
     VECTOR_MODE (CLASS, MODE, COUNT);
132
        Declare a vector mode whose component mode is MODE (of class
133
        CLASS) with COUNT components.  CLASS must be INT or FLOAT.
134
        The name of the vector mode takes the form VnX where n is
135
        COUNT in decimal and X is MODE.
136
 
137
     VECTOR_MODES (CLASS, WIDTH);
138
        For all modes presently declared in class CLASS, construct
139
        corresponding vector modes having width WIDTH.  Modes whose
140
        byte sizes do not evenly divide WIDTH are ignored, as are
141
        modes that would produce vector modes with only one component,
142
        and modes smaller than one byte (if CLASS is INT) or smaller
143
        than two bytes (if CLASS is FLOAT).  CLASS must be INT or
144
        FLOAT.  The names follow the same rule as VECTOR_MODE uses.
145
 
146
     COMPLEX_MODES (CLASS);
147
        For all modes presently declared in class CLASS, construct
148
        corresponding complex modes.  Modes smaller than one byte
149
        are ignored.  For FLOAT modes, the names are derived by
150
        replacing the 'F' in the mode name with a 'C'.  (It is an
151
        error if there is no 'F'.  For INT modes, the names are
152
        derived by prefixing a C to the name.
153
 
154
     ADJUST_BYTESIZE (MODE, EXPR);
155
     ADJUST_ALIGNMENT (MODE, EXPR);
156
     ADJUST_FLOAT_FORMAT (MODE, EXPR);
157
     ADJUST_IBIT (MODE, EXPR);
158
     ADJUST_FBIT (MODE, EXPR);
159
        Arrange for the byte size, alignment, floating point format, ibit,
160
        or fbit of MODE to be adjustable at run time.  EXPR will be executed
161
        once after processing all command line options, and should
162
        evaluate to the desired byte size, alignment, format, ibit or fbit.
163
 
164
        Unlike a FORMAT argument, if you are adjusting a float format
165
        you must put an & in front of the name of each format structure.
166
 
167
   Note: If a mode is ever made which is more than 255 bytes wide,
168
   machmode.h and genmodes.c will have to be changed to allocate
169
   more space for the mode_size and mode_alignment arrays.  */
170
 
171
/* VOIDmode is used when no mode needs to be specified,
172
   as for example on CONST_INT RTL expressions.  */
173
RANDOM_MODE (VOID);
174
 
175
/* BLKmode is used for structures, arrays, etc.
176
   that fit no more specific mode.  */
177
RANDOM_MODE (BLK);
178
 
179
/* Single bit mode used for booleans.  */
180
FRACTIONAL_INT_MODE (BI, 1, 1);
181
 
182
/* Basic integer modes.  We go up to TI in generic code (128 bits).
183
   The name OI is reserved for a 256-bit type (needed by some back ends).
184
   FIXME TI shouldn't be generically available either.  */
185
INT_MODE (QI, 1);
186
INT_MODE (HI, 2);
187
INT_MODE (SI, 4);
188
INT_MODE (DI, 8);
189
INT_MODE (TI, 16);
190
 
191
/* No partial integer modes are defined by default.  */
192
 
193
/* Basic floating point modes.  SF and DF are the only modes provided
194
   by default.  The names QF, HF, XF, and TF are reserved for targets
195
   that need 1-word, 2-word, 80-bit, or 128-bit float types respectively.
196
 
197
   These are the IEEE mappings.  They can be overridden with
198
   RESET_FLOAT_FORMAT or at runtime (in TARGET_OPTION_OVERRIDE).  */
199
 
200
FLOAT_MODE (SF, 4, ieee_single_format);
201
FLOAT_MODE (DF, 8, ieee_double_format);
202
 
203
/* Basic CC modes.
204
   FIXME define this only for targets that need it.  */
205
CC_MODE (CC);
206
 
207
/* Fixed-point modes.  */
208
FRACT_MODE (QQ, 1, 7); /* s.7 */
209
FRACT_MODE (HQ, 2, 15); /* s.15 */
210
FRACT_MODE (SQ, 4, 31); /* s.31 */
211
FRACT_MODE (DQ, 8, 63); /* s.63 */
212
FRACT_MODE (TQ, 16, 127); /* s.127 */
213
 
214
UFRACT_MODE (UQQ, 1, 8); /* .8 */
215
UFRACT_MODE (UHQ, 2, 16); /* .16 */
216
UFRACT_MODE (USQ, 4, 32); /* .32 */
217
UFRACT_MODE (UDQ, 8, 64); /* .64 */
218
UFRACT_MODE (UTQ, 16, 128); /* .128 */
219
 
220
ACCUM_MODE (HA, 2, 8, 7); /* s8.7 */
221
ACCUM_MODE (SA, 4, 16, 15); /* s16.15 */
222
ACCUM_MODE (DA, 8, 32, 31); /* s32.31 */
223
ACCUM_MODE (TA, 16, 64, 63); /* s64.63 */
224
 
225
UACCUM_MODE (UHA, 2, 8, 8); /* 8.8 */
226
UACCUM_MODE (USA, 4, 16, 16); /* 16.16 */
227
UACCUM_MODE (UDA, 8, 32, 32); /* 32.32 */
228
UACCUM_MODE (UTA, 16, 64, 64); /* 64.64 */
229
 
230
/* Allow the target to specify additional modes of various kinds.  */
231
#if HAVE_EXTRA_MODES
232
# include EXTRA_MODES_FILE
233
#endif
234
 
235
/* Complex modes.  */
236
COMPLEX_MODES (INT);
237
COMPLEX_MODES (FLOAT);
238
 
239
/* Decimal floating point modes.  */
240
DECIMAL_FLOAT_MODE (SD, 4, decimal_single_format);
241
DECIMAL_FLOAT_MODE (DD, 8, decimal_double_format);
242
DECIMAL_FLOAT_MODE (TD, 16, decimal_quad_format);
243
 
244
/* The symbol Pmode stands for one of the above machine modes (usually SImode).
245
   The tm.h file specifies which one.  It is not a distinct mode.  */
246
 
247
/*
248
Local variables:
249
mode:c
250
version-control: t
251
End:
252
*/

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.