machmode.h revision 52284 
1/* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
2   Copyright (C) 1991, 1993, 1994, 1996, 1998 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6GNU CC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2, or (at your option)
9any later version.
10
11GNU CC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
20
21#ifndef HAVE_MACHINE_MODES
22#define HAVE_MACHINE_MODES
23
24/* Strictly speaking, this isn't the proper place to include these definitions,
25   but this file is included by every GCC file. */
26
27/* Provide a default way to print an address in hex via printf.  */
28
29#ifndef HOST_PTR_PRINTF
30# ifdef HAVE_PRINTF_PTR
31#  define HOST_PTR_PRINTF "%p"
32# else
33#  define HOST_PTR_PRINTF \
34    (sizeof (int) == sizeof (char *) ? "%x" \
35     : sizeof (long) == sizeof (char *) ? "%lx" : "%llx")
36# endif
37#endif /* ! HOST_PTR_PRINTF */
38
39/* Make an enum class that gives all the machine modes.  */
40
41#define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
42
43enum machine_mode {
44#include "machmode.def"
45
46#ifdef EXTRA_CC_MODES
47  EXTRA_CC_MODES,
48#endif
49MAX_MACHINE_MODE };
50
51#undef DEF_MACHMODE
52
53#ifndef NUM_MACHINE_MODES
54#define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
55#endif
56
57/* Get the name of mode MODE as a string.  */
58
59extern char *mode_name[];
60#define GET_MODE_NAME(MODE)		(mode_name[(int) (MODE)])
61
62enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
63		  MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
64
65/* Get the general kind of object that mode MODE represents
66   (integer, floating, complex, etc.)  */
67
68extern enum mode_class mode_class[];
69#define GET_MODE_CLASS(MODE)		(mode_class[(int) (MODE)])
70
71/* Nonzero if MODE is an integral mode.  */
72#define INTEGRAL_MODE_P(MODE)			\
73  (GET_MODE_CLASS (MODE) == MODE_INT		\
74   || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
75   || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT)
76
77/* Nonzero if MODE is a floating-point mode.  */
78#define FLOAT_MODE_P(MODE)		\
79  (GET_MODE_CLASS (MODE) == MODE_FLOAT	\
80   || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
81
82/* Nonzero if MODE is a complex mode.  */
83#define COMPLEX_MODE_P(MODE)			\
84  (GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT	\
85   || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
86
87/* Get the size in bytes of an object of mode MODE.  */
88
89extern int mode_size[];
90#define GET_MODE_SIZE(MODE)		(mode_size[(int) (MODE)])
91
92/* Get the size in bytes of the basic parts of an object of mode MODE.  */
93
94extern int mode_unit_size[];
95#define GET_MODE_UNIT_SIZE(MODE)	(mode_unit_size[(int) (MODE)])
96
97/* Get the number of units in the object.  */
98
99#define GET_MODE_NUNITS(MODE)  \
100  ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
101   : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
102
103/* Get the size in bits of an object of mode MODE.  */
104
105#define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int) (MODE)])
106
107#ifdef HOST_WIDE_INT
108
109/* Get a bitmask containing 1 for all bits in a word
110   that fit within mode MODE.  */
111
112extern unsigned HOST_WIDE_INT mode_mask_array[];
113
114#define GET_MODE_MASK(MODE) mode_mask_array[(int) (MODE)]
115
116#endif /* HOST_WIDE_INT */
117
118/* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
119
120extern unsigned char mode_wider_mode[];
121#define GET_MODE_WIDER_MODE(MODE)	((enum machine_mode)mode_wider_mode[(int) (MODE)])
122
123/* Return the mode for data of a given size SIZE and mode class CLASS.
124   If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
125   The value is BLKmode if no other mode is found.  */
126
127extern enum machine_mode mode_for_size PROTO((unsigned int, enum mode_class, int));
128
129/* Similar, but find the smallest mode for a given width.  */
130
131extern enum machine_mode smallest_mode_for_size  PROTO((unsigned int,
132                                                        enum mode_class));
133
134
135/* Return an integer mode of the exact same size as the input mode,
136   or BLKmode on failure.  */
137
138extern enum machine_mode int_mode_for_mode PROTO((enum machine_mode));
139
140/* Find the best mode to use to access a bit field.  */
141
142extern enum machine_mode get_best_mode PROTO((int, int, int, enum machine_mode, int));
143
144/* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
145
146#define GET_MODE_ALIGNMENT(MODE)   \
147  MIN (BIGGEST_ALIGNMENT, 	   \
148       MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
149
150/* For each class, get the narrowest mode in that class.  */
151
152extern enum machine_mode class_narrowest_mode[];
153#define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int) (CLASS)]
154
155/* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
156   and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
157
158extern enum machine_mode byte_mode;
159extern enum machine_mode word_mode;
160extern enum machine_mode ptr_mode;
161
162#endif /* not HAVE_MACHINE_MODES */
163