machmode.h revision 90075 
1/* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
2   Copyright (C) 1991, 1993, 1994, 1996, 1998, 1999, 2000, 2001
3   Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to the Free
19Software Foundation, 59 Temple Place - Suite 330, Boston, MA
2002111-1307, USA.  */
21
22#ifndef HAVE_MACHINE_MODES
23#define HAVE_MACHINE_MODES
24
25/* Make an enum class that gives all the machine modes.  */
26
27#define DEF_MACHMODE(SYM, NAME, TYPE, BITSIZE, SIZE, UNIT, WIDER)  SYM,
28
29enum machine_mode {
30#include "machmode.def"
31MAX_MACHINE_MODE };
32
33#undef DEF_MACHMODE
34
35#ifndef NUM_MACHINE_MODES
36#define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
37#endif
38
39/* Get the name of mode MODE as a string.  */
40
41extern const char * const mode_name[NUM_MACHINE_MODES];
42#define GET_MODE_NAME(MODE)		(mode_name[(int) (MODE)])
43
44enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
45		  MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT,
46		  MODE_VECTOR_INT, MODE_VECTOR_FLOAT,
47		  MAX_MODE_CLASS};
48
49/* Get the general kind of object that mode MODE represents
50   (integer, floating, complex, etc.)  */
51
52extern const enum mode_class mode_class[NUM_MACHINE_MODES];
53#define GET_MODE_CLASS(MODE)		(mode_class[(int) (MODE)])
54
55/* Nonzero if MODE is an integral mode.  */
56#define INTEGRAL_MODE_P(MODE)			\
57  (GET_MODE_CLASS (MODE) == MODE_INT		\
58   || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
59   || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT \
60   || GET_MODE_CLASS (MODE) == MODE_VECTOR_INT)
61
62/* Nonzero if MODE is a floating-point mode.  */
63#define FLOAT_MODE_P(MODE)		\
64  (GET_MODE_CLASS (MODE) == MODE_FLOAT	\
65   || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT \
66   || GET_MODE_CLASS (MODE) == MODE_VECTOR_FLOAT)
67
68/* Nonzero if MODE is a complex mode.  */
69#define COMPLEX_MODE_P(MODE)			\
70  (GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT	\
71   || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
72
73/* Nonzero if MODE is a vector mode.  */
74#define VECTOR_MODE_P(MODE)			\
75  (GET_MODE_CLASS (MODE) == MODE_VECTOR_INT	\
76   || GET_MODE_CLASS (MODE) == MODE_VECTOR_FLOAT)
77
78/* Get the size in bytes of an object of mode MODE.  */
79
80extern const unsigned char mode_size[NUM_MACHINE_MODES];
81#define GET_MODE_SIZE(MODE)		(mode_size[(int) (MODE)])
82
83/* Get the size in bytes of the basic parts of an object of mode MODE.  */
84
85extern const unsigned char mode_unit_size[NUM_MACHINE_MODES];
86#define GET_MODE_UNIT_SIZE(MODE)	(mode_unit_size[(int) (MODE)])
87
88/* Get the number of units in the object.  */
89
90#define GET_MODE_NUNITS(MODE)  \
91  ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
92   : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
93
94/* Get the size in bits of an object of mode MODE.  */
95
96extern const unsigned short mode_bitsize[NUM_MACHINE_MODES];
97#define GET_MODE_BITSIZE(MODE)  (mode_bitsize[(int) (MODE)])
98
99#endif /* not HAVE_MACHINE_MODES */
100
101#if defined HOST_WIDE_INT && ! defined GET_MODE_MASK
102
103/* Get a bitmask containing 1 for all bits in a word
104   that fit within mode MODE.  */
105
106extern const unsigned HOST_WIDE_INT mode_mask_array[NUM_MACHINE_MODES];
107
108#define GET_MODE_MASK(MODE) mode_mask_array[(int) (MODE)]
109
110#endif /* defined (HOST_WIDE_INT) && ! defined GET_MODE_MASK */
111
112#if ! defined GET_MODE_WIDER_MODE || ! defined GET_MODE_ALIGNMENT \
113    || ! defined GET_CLASS_NARROWEST_MODE
114
115/* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
116
117extern const unsigned char mode_wider_mode[NUM_MACHINE_MODES];
118#define GET_MODE_WIDER_MODE(MODE)	((enum machine_mode)mode_wider_mode[(int) (MODE)])
119
120/* Return the mode for data of a given size SIZE and mode class CLASS.
121   If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
122   The value is BLKmode if no other mode is found.  */
123
124extern enum machine_mode mode_for_size PARAMS ((unsigned int,
125						enum mode_class, int));
126
127/* Similar, but find the smallest mode for a given width.  */
128
129extern enum machine_mode smallest_mode_for_size
130				PARAMS ((unsigned int, enum mode_class));
131
132
133/* Return an integer mode of the exact same size as the input mode,
134   or BLKmode on failure.  */
135
136extern enum machine_mode int_mode_for_mode PARAMS ((enum machine_mode));
137
138/* Find the best mode to use to access a bit field.  */
139
140extern enum machine_mode get_best_mode PARAMS ((int, int, unsigned int,
141						enum machine_mode, int));
142
143/* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
144
145extern unsigned get_mode_alignment PARAMS ((enum machine_mode));
146
147#define GET_MODE_ALIGNMENT(MODE) get_mode_alignment (MODE)
148
149/* For each class, get the narrowest mode in that class.  */
150
151extern const enum machine_mode class_narrowest_mode[(int) MAX_MODE_CLASS];
152#define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int) (CLASS)]
153
154/* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
155   and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
156
157extern enum machine_mode byte_mode;
158extern enum machine_mode word_mode;
159extern enum machine_mode ptr_mode;
160
161#endif /* ! defined GET_MODE_WIDER_MODE || ! defined GET_MODE_ALIGNMENT
162	  || ! defined GET_CLASS_NARROWEST_MODE */
163