gcc/machmode.h

   1 /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
   2    Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   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)
   9 any later version.
  10
  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.
  15
  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, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef HAVE_MACHINE_MODES
  22 #define HAVE_MACHINE_MODES
  23
  24 #include "gansidecl.h"
  25
  26 /* Strictly speaking, this isn't the proper place to include these definitions,
  27    but this file is included by every GCC file.
  28
  29    Some systems define these in, e.g., param.h.  We undefine these names
  30    here to avoid the warnings.  We prefer to use our definitions since we
  31    know they are correct.  */
  32
  33 #undef MIN
  34 #undef MAX
  35
  36 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
  37 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
  38
  39 /* Find the largest host integer type and set its size and type.  */
  40
  41 #ifndef HOST_BITS_PER_WIDE_INT
  42
  43 #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
  44 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
  45 #define HOST_WIDE_INT long
  46 #else
  47 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
  48 #define HOST_WIDE_INT int
  49 #endif
  50
  51 #endif
  52
  53 /* Provide a default way to print an address in hex via printf.  */
  54
  55 #ifndef HOST_PTR_PRINTF
  56 #define HOST_PTR_PRINTF sizeof (int) == sizeof (char *) ? "%x" : "%lx"
  57 #endif
  58
  59 /* Make an enum class that gives all the machine modes.  */
  60
  61 #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
  62
  63 enum machine_mode {
  64 #include "machmode.def"
  65
  66 #ifdef EXTRA_CC_MODES
  67   EXTRA_CC_MODES,
  68 #endif
  69 MAX_MACHINE_MODE };
  70
  71 #undef DEF_MACHMODE
  72
  73 #ifndef NUM_MACHINE_MODES
  74 #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
  75 #endif
  76
  77 /* Get the name of mode MODE as a string.  */
  78
  79 extern char *mode_name[];
  80 #define GET_MODE_NAME(MODE)             (mode_name[(int) (MODE)])
  81
  82 enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
  83                   MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
  84
  85 /* Get the general kind of object that mode MODE represents
  86    (integer, floating, complex, etc.)  */
  87
  88 extern enum mode_class mode_class[];
  89 #define GET_MODE_CLASS(MODE)            (mode_class[(int) (MODE)])
  90
  91 /* Nonzero if MODE is an integral mode.  */
  92 #define INTEGRAL_MODE_P(MODE)                   \
  93   (GET_MODE_CLASS (MODE) == MODE_INT            \
  94    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
  95    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT)
  96
  97 /* Nonzero if MODE is a floating-point mode.  */
  98 #define FLOAT_MODE_P(MODE)              \
  99   (GET_MODE_CLASS (MODE) == MODE_FLOAT  \
 100    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
 101
 102 /* Get the size in bytes of an object of mode MODE.  */
 103
 104 extern int mode_size[];
 105 #define GET_MODE_SIZE(MODE)             (mode_size[(int) (MODE)])
 106
 107 /* Get the size in bytes of the basic parts of an object of mode MODE.  */
 108
 109 extern int mode_unit_size[];
 110 #define GET_MODE_UNIT_SIZE(MODE)        (mode_unit_size[(int) (MODE)])
 111
 112 /* Get the number of units in the object.  */
 113
 114 #define GET_MODE_NUNITS(MODE)  \
 115   ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
 116    : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
 117
 118 /* Get the size in bits of an object of mode MODE.  */
 119
 120 #define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int) (MODE)])
 121
 122 /* Get a bitmask containing 1 for all bits in a word
 123    that fit within mode MODE.  */
 124
 125 #define GET_MODE_MASK(MODE)  \
 126    ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_WIDE_INT)  \
 127     ?(HOST_WIDE_INT) ~0 : (((HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (MODE)) - 1))
 128
 129 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 130
 131 extern enum machine_mode mode_wider_mode[];
 132 #define GET_MODE_WIDER_MODE(MODE)       (mode_wider_mode[(int) (MODE)])
 133
 134 /* Return the mode for data of a given size SIZE and mode class CLASS.
 135    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 136    The value is BLKmode if no other mode is found.  */
 137
 138 extern enum machine_mode mode_for_size PROTO((unsigned int, enum mode_class, int));
 139
 140 /* Find the best mode to use to access a bit field.  */
 141
 142 extern 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
 152 extern 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
 158 extern enum machine_mode byte_mode;
 159 extern enum machine_mode word_mode;
 160 extern enum machine_mode ptr_mode;
 161
 162 #endif /* not HAVE_MACHINE_MODES */