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 /* Add prototype support.  */
  22 #ifndef PROTO
  23 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
  24 #define PROTO(ARGS) ARGS
  25 #else
  26 #define PROTO(ARGS) ()
  27 #endif
  28 #endif
  29
  30 #ifndef HAVE_MACHINE_MODES
  31
  32 /* Strictly speaking, this isn't the proper place to include these definitions,
  33    but this file is included by every GCC file.
  34
  35    Some systems define these in, e.g., param.h.  We undefine these names
  36    here to avoid the warnings.  We prefer to use our definitions since we
  37    know they are correct.  */
  38
  39 #undef MIN
  40 #undef MAX
  41
  42 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
  43 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
  44
  45 /* Find the largest host integer type and set its size and type.  */
  46
  47 #ifndef HOST_BITS_PER_WIDE_INT
  48
  49 #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
  50 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
  51 #define HOST_WIDE_INT long
  52 #else
  53 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
  54 #define HOST_WIDE_INT int
  55 #endif
  56
  57 #endif
  58
  59 /* Define the number of entries in an 8-bit `shorts' array needed to represent
  60    the largest supported constant, which is twice the width of the largest
  61    host integer type.  */
  62
  63 #ifndef MAX_SHORTS
  64 #define MAX_SHORTS (HOST_BITS_PER_WIDE_INT * 2 / 8)
  65 #endif
  66
  67 /* Provide a default way to print an address in hex via printf.  */
  68
  69 #ifndef HOST_PTR_PRINTF
  70 #define HOST_PTR_PRINTF sizeof (int) == sizeof (char *) ? "%x" : "%lx"
  71 #endif
  72
  73 /* Make an enum class that gives all the machine modes.  */
  74
  75 #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
  76
  77 enum machine_mode {
  78 #include "machmode.def"
  79
  80 #ifdef EXTRA_CC_MODES
  81   EXTRA_CC_MODES,
  82 #endif
  83 MAX_MACHINE_MODE };
  84
  85 #undef DEF_MACHMODE
  86
  87 #define HAVE_MACHINE_MODES
  88
  89 #ifndef NUM_MACHINE_MODES
  90 #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
  91 #endif
  92
  93 /* Get the name of mode MODE as a string.  */
  94
  95 extern char *mode_name[];
  96 #define GET_MODE_NAME(MODE)             (mode_name[(int)(MODE)])
  97
  98 enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
  99                   MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
 100
 101 /* Get the general kind of object that mode MODE represents
 102    (integer, floating, complex, etc.)  */
 103
 104 extern enum mode_class mode_class[];
 105 #define GET_MODE_CLASS(MODE)            (mode_class[(int)(MODE)])
 106
 107 /* Get the size in bytes of an object of mode MODE.  */
 108
 109 extern int mode_size[];
 110 #define GET_MODE_SIZE(MODE)             (mode_size[(int)(MODE)])
 111
 112 /* Get the size in bytes of the basic parts of an object of mode MODE.  */
 113
 114 extern int mode_unit_size[];
 115 #define GET_MODE_UNIT_SIZE(MODE)        (mode_unit_size[(int)(MODE)])
 116
 117 /* Get the number of units in the object.  */
 118
 119 #define GET_MODE_NUNITS(MODE)  \
 120   ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
 121    : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
 122
 123 /* Get the size in bits of an object of mode MODE.  */
 124
 125 #define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int)(MODE)])
 126
 127 /* Get a bitmask containing 1 for all bits in a word
 128    that fit within mode MODE.  */
 129
 130 #define GET_MODE_MASK(MODE)  \
 131    ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_WIDE_INT)  \
 132     ?(HOST_WIDE_INT) ~0 : (((HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (MODE)) - 1))
 133
 134 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 135
 136 extern enum machine_mode mode_wider_mode[];
 137 #define GET_MODE_WIDER_MODE(MODE)       (mode_wider_mode[(int)(MODE)])
 138
 139 /* Return the mode for data of a given size SIZE and mode class CLASS.
 140    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 141    The value is BLKmode if no other mode is found.  */
 142
 143 extern enum machine_mode mode_for_size PROTO((unsigned int, enum mode_class, int));
 144
 145 /* Find the best mode to use to access a bit field.  */
 146
 147 extern enum machine_mode get_best_mode PROTO((int, int, int, enum machine_mode, int));
 148
 149 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 150
 151 #define GET_MODE_ALIGNMENT(MODE)   \
 152   MIN (BIGGEST_ALIGNMENT,          \
 153        MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
 154
 155 /* For each class, get the narrowest mode in that class.  */
 156
 157 extern enum machine_mode class_narrowest_mode[];
 158 #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
 159
 160 /* Define the integer modes whose sizes are BITS_PER_UNIT
 161    and BITS_PER_WORD.  */
 162
 163 extern enum machine_mode byte_mode;
 164 extern enum machine_mode word_mode;
 165
 166 #endif /* not HAVE_MACHINE_MODES */