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 /* Make an enum class that gives all the machine modes. */
38 #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER) SYM,
41 #include "machmode.def"
50 #define HAVE_MACHINE_MODES
52 #ifndef NUM_MACHINE_MODES
53 #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
56 /* Get the name of mode MODE as a string. */
58 extern char *mode_name
[];
59 #define GET_MODE_NAME(MODE) (mode_name[(int)(MODE)])
61 enum mode_class
{ MODE_RANDOM
, MODE_INT
, MODE_FLOAT
, MODE_PARTIAL_INT
, MODE_CC
,
62 MODE_COMPLEX_INT
, MODE_COMPLEX_FLOAT
, MAX_MODE_CLASS
};
64 /* Get the general kind of object that mode MODE represents
65 (integer, floating, complex, etc.) */
67 extern enum mode_class mode_class
[];
68 #define GET_MODE_CLASS(MODE) (mode_class[(int)(MODE)])
70 /* Get the size in bytes of an object of mode MODE. */
72 extern int mode_size
[];
73 #define GET_MODE_SIZE(MODE) (mode_size[(int)(MODE)])
75 /* Get the size in bytes of the basic parts of an object of mode MODE. */
77 extern int mode_unit_size
[];
78 #define GET_MODE_UNIT_SIZE(MODE) (mode_unit_size[(int)(MODE)])
80 /* Get the number of units in the object. */
82 #define GET_MODE_NUNITS(MODE) \
83 (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE)))
85 /* Get the size in bits of an object of mode MODE. */
87 #define GET_MODE_BITSIZE(MODE) (BITS_PER_UNIT * mode_size[(int)(MODE)])
89 /* Get a bitmask containing 1 for all bits in a word
90 that fit within mode MODE. */
92 #define GET_MODE_MASK(MODE) \
93 ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_INT) \
94 ? -1 : ((1 << GET_MODE_BITSIZE (MODE)) - 1))
96 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI). */
98 extern enum machine_mode mode_wider_mode
[];
99 #define GET_MODE_WIDER_MODE(MODE) (mode_wider_mode[(int)(MODE)])
101 /* Find the best mode to use to access a bit field. */
103 extern enum machine_mode
get_best_mode ();
105 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT. */
107 #define GET_MODE_ALIGNMENT(MODE) \
108 MIN (BIGGEST_ALIGNMENT, \
109 MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
111 /* For each class, get the narrowest mode in that class. */
113 extern enum machine_mode class_narrowest_mode
[];
114 #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
116 /* Define the integer modes whose sizes are BITS_PER_UNIT
117 and BITS_PER_WORD. */
119 extern enum machine_mode byte_mode
;
120 extern enum machine_mode word_mode
;
122 #endif /* not HAVE_MACHINE_MODES */