gcc/machmode.h

   1 /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
   2    Copyright (C) 1991  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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #ifndef HAVE_MACHINE_MODES
  22
  23 /* Strictly speaking, this isn't the proper place to include these definitions,
  24    but this file is included by every GCC file.
  25
  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.  */
  29
  30 #undef MIN
  31 #undef MAX
  32
  33 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
  34 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
  35
  36 /* Make an enum class that gives all the machine modes.  */
  37
  38 #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
  39
  40 enum machine_mode {
  41 #include "machmode.def"
  42
  43 #ifdef EXTRA_CC_MODES
  44   EXTRA_CC_MODES,
  45 #endif
  46 MAX_MACHINE_MODE };
  47
  48 #undef DEF_MACHMODE
  49
  50 #define HAVE_MACHINE_MODES
  51
  52 #ifndef NUM_MACHINE_MODES
  53 #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
  54 #endif
  55
  56 /* Get the name of mode MODE as a string.  */
  57
  58 extern char *mode_name[];
  59 #define GET_MODE_NAME(MODE)             (mode_name[(int)(MODE)])
  60
  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};
  63
  64 /* Get the general kind of object that mode MODE represents
  65    (integer, floating, complex, etc.)  */
  66
  67 extern enum mode_class mode_class[];
  68 #define GET_MODE_CLASS(MODE)            (mode_class[(int)(MODE)])
  69
  70 /* Get the size in bytes of an object of mode MODE.  */
  71
  72 extern int mode_size[];
  73 #define GET_MODE_SIZE(MODE)             (mode_size[(int)(MODE)])
  74
  75 /* Get the size in bytes of the basic parts of an object of mode MODE.  */
  76
  77 extern int mode_unit_size[];
  78 #define GET_MODE_UNIT_SIZE(MODE)        (mode_unit_size[(int)(MODE)])
  79
  80 /* Get the number of units in the object.  */
  81
  82 #define GET_MODE_NUNITS(MODE)  \
  83   (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE)))
  84
  85 /* Get the size in bits of an object of mode MODE.  */
  86
  87 #define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int)(MODE)])
  88
  89 /* Get a bitmask containing 1 for all bits in a word
  90    that fit within mode MODE.  */
  91
  92 #define GET_MODE_MASK(MODE)  \
  93    ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_INT)  \
  94     ? -1 : ((1 << GET_MODE_BITSIZE (MODE)) - 1))
  95
  96 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
  97
  98 extern enum machine_mode mode_wider_mode[];
  99 #define GET_MODE_WIDER_MODE(MODE)       (mode_wider_mode[(int)(MODE)])
 100
 101 /* Return the mode for data of a given size SIZE and mode class CLASS.
 102    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 103    The value is BLKmode if no other mode is found.  */
 104
 105 extern enum machine_mode mode_for_size ();
 106
 107 /* Find the best mode to use to access a bit field.  */
 108
 109 extern enum machine_mode get_best_mode ();
 110
 111 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 112
 113 #define GET_MODE_ALIGNMENT(MODE)   \
 114   MIN (BIGGEST_ALIGNMENT,          \
 115        MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
 116
 117 /* For each class, get the narrowest mode in that class.  */
 118
 119 extern enum machine_mode class_narrowest_mode[];
 120 #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
 121
 122 /* Define the integer modes whose sizes are BITS_PER_UNIT
 123    and BITS_PER_WORD.  */
 124
 125 extern enum machine_mode byte_mode;
 126 extern enum machine_mode word_mode;
 127
 128 #endif /* not HAVE_MACHINE_MODES */