1 /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
2 Copyright (C) 1991 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #ifndef HAVE_MACHINE_MODES
23 /* Strictly speaking, this isn't the proper place to include these definitions,
24 but this file is included by every GCC file.
26 Some systems define these in, e.g., param.h. We undefine these names
27 here to avoid the warnings. We prefer to use our definitions since we
28 know they are correct. */
33 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
34 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
36 /* Find the largest host integer type and set its size and type. */
38 #ifndef HOST_BITS_PER_WIDE_INT
40 #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
41 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
42 #define HOST_WIDE_INT long
44 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
45 #define HOST_WIDE_INT int
50 /* Define the number of entries in an 8-bit `shorts' array needed to represent
51 the largest supported constant, which is twice the width of the largest
55 #define MAX_SHORTS (HOST_BITS_PER_WIDE_INT * 2 / 8)
58 /* Provide a default way to print an address in hex via printf. */
60 #ifndef HOST_PTR_PRINTF
61 #define HOST_PTR_PRINTF sizeof (int) == sizeof (char *) ? "%x" : "%lx"
64 /* Make an enum class that gives all the machine modes. */
66 #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER) SYM,
69 #include "machmode.def"
78 #define HAVE_MACHINE_MODES
80 #ifndef NUM_MACHINE_MODES
81 #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
84 /* Get the name of mode MODE as a string. */
86 extern char *mode_name
[];
87 #define GET_MODE_NAME(MODE) (mode_name[(int)(MODE)])
89 enum mode_class
{ MODE_RANDOM
, MODE_INT
, MODE_FLOAT
, MODE_PARTIAL_INT
, MODE_CC
,
90 MODE_COMPLEX_INT
, MODE_COMPLEX_FLOAT
, MAX_MODE_CLASS
};
92 /* Get the general kind of object that mode MODE represents
93 (integer, floating, complex, etc.) */
95 extern enum mode_class mode_class
[];
96 #define GET_MODE_CLASS(MODE) (mode_class[(int)(MODE)])
98 /* Get the size in bytes of an object of mode MODE. */
100 extern int mode_size
[];
101 #define GET_MODE_SIZE(MODE) (mode_size[(int)(MODE)])
103 /* Get the size in bytes of the basic parts of an object of mode MODE. */
105 extern int mode_unit_size
[];
106 #define GET_MODE_UNIT_SIZE(MODE) (mode_unit_size[(int)(MODE)])
108 /* Get the number of units in the object. */
110 #define GET_MODE_NUNITS(MODE) \
111 ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
112 : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
114 /* Get the size in bits of an object of mode MODE. */
116 #define GET_MODE_BITSIZE(MODE) (BITS_PER_UNIT * mode_size[(int)(MODE)])
118 /* Get a bitmask containing 1 for all bits in a word
119 that fit within mode MODE. */
121 #define GET_MODE_MASK(MODE) \
122 ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_WIDE_INT) \
123 ?(HOST_WIDE_INT) ~0 : (((HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (MODE)) - 1))
125 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI). */
127 extern enum machine_mode mode_wider_mode
[];
128 #define GET_MODE_WIDER_MODE(MODE) (mode_wider_mode[(int)(MODE)])
130 /* Return the mode for data of a given size SIZE and mode class CLASS.
131 If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
132 The value is BLKmode if no other mode is found. */
134 extern enum machine_mode
mode_for_size ();
136 /* Find the best mode to use to access a bit field. */
138 extern enum machine_mode
get_best_mode ();
140 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT. */
142 #define GET_MODE_ALIGNMENT(MODE) \
143 MIN (BIGGEST_ALIGNMENT, \
144 MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
146 /* For each class, get the narrowest mode in that class. */
148 extern enum machine_mode class_narrowest_mode
[];
149 #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
151 /* Define the integer modes whose sizes are BITS_PER_UNIT
152 and BITS_PER_WORD. */
154 extern enum machine_mode byte_mode
;
155 extern enum machine_mode word_mode
;
157 #endif /* not HAVE_MACHINE_MODES */