gcc/machmode.h

   1 /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
   2    Copyright (C) 1991, 1993, 1994  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
  22 /* Add prototype support.  */
  23 #ifndef PROTO
  24 #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
  25 #define PROTO(ARGS) ARGS
  26 #else
  27 #define PROTO(ARGS) ()
  28 #endif
  29 #endif
  30
  31 #ifndef HAVE_MACHINE_MODES
  32
  33 /* Strictly speaking, this isn't the proper place to include these definitions,
  34    but this file is included by every GCC file.
  35
  36    Some systems define these in, e.g., param.h.  We undefine these names
  37    here to avoid the warnings.  We prefer to use our definitions since we
  38    know they are correct.  */
  39
  40 #undef MIN
  41 #undef MAX
  42
  43 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
  44 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
  45
  46 /* Find the largest host integer type and set its size and type.  */
  47
  48 #ifndef HOST_BITS_PER_WIDE_INT
  49
  50 #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
  51 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
  52 #define HOST_WIDE_INT long
  53 #else
  54 #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
  55 #define HOST_WIDE_INT int
  56 #endif
  57
  58 #endif
  59
  60 /* Provide a default way to print an address in hex via printf.  */
  61
  62 #ifndef HOST_PTR_PRINTF
  63 #define HOST_PTR_PRINTF sizeof (int) == sizeof (char *) ? "%x" : "%lx"
  64 #endif
  65
  66 /* Make an enum class that gives all the machine modes.  */
  67
  68 #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
  69
  70 enum machine_mode {
  71 #include "machmode.def"
  72
  73 #ifdef EXTRA_CC_MODES
  74   EXTRA_CC_MODES,
  75 #endif
  76 MAX_MACHINE_MODE };
  77
  78 #undef DEF_MACHMODE
  79
  80 #define HAVE_MACHINE_MODES
  81
  82 #ifndef NUM_MACHINE_MODES
  83 #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
  84 #endif
  85
  86 /* Get the name of mode MODE as a string.  */
  87
  88 extern char *mode_name[];
  89 #define GET_MODE_NAME(MODE)             (mode_name[(int)(MODE)])
  90
  91 enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
  92                   MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
  93
  94 /* Get the general kind of object that mode MODE represents
  95    (integer, floating, complex, etc.)  */
  96
  97 extern enum mode_class mode_class[];
  98 #define GET_MODE_CLASS(MODE)            (mode_class[(int)(MODE)])
  99
 100 /* Nonzero if MODE is an integral mode.  */
 101 #define INTEGRAL_MODE_P(MODE)                   \
 102   (GET_MODE_CLASS (MODE) == MODE_INT            \
 103    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
 104    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT)
 105
 106 /* Nonzero if MODE is a floating-point mode.  */
 107 #define FLOAT_MODE_P(MODE)              \
 108   (GET_MODE_CLASS (MODE) == MODE_FLOAT  \
 109    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
 110
 111 /* Get the size in bytes of an object of mode MODE.  */
 112
 113 extern int mode_size[];
 114 #define GET_MODE_SIZE(MODE)             (mode_size[(int)(MODE)])
 115
 116 /* Get the size in bytes of the basic parts of an object of mode MODE.  */
 117
 118 extern int mode_unit_size[];
 119 #define GET_MODE_UNIT_SIZE(MODE)        (mode_unit_size[(int)(MODE)])
 120
 121 /* Get the number of units in the object.  */
 122
 123 #define GET_MODE_NUNITS(MODE)  \
 124   ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
 125    : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
 126
 127 /* Get the size in bits of an object of mode MODE.  */
 128
 129 #define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int)(MODE)])
 130
 131 /* Get a bitmask containing 1 for all bits in a word
 132    that fit within mode MODE.  */
 133
 134 #define GET_MODE_MASK(MODE)  \
 135    ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_WIDE_INT)  \
 136     ?(HOST_WIDE_INT) ~0 : (((HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (MODE)) - 1))
 137
 138 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 139
 140 extern enum machine_mode mode_wider_mode[];
 141 #define GET_MODE_WIDER_MODE(MODE)       (mode_wider_mode[(int)(MODE)])
 142
 143 /* Return the mode for data of a given size SIZE and mode class CLASS.
 144    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 145    The value is BLKmode if no other mode is found.  */
 146
 147 extern enum machine_mode mode_for_size PROTO((unsigned int, enum mode_class, int));
 148
 149 /* Find the best mode to use to access a bit field.  */
 150
 151 extern enum machine_mode get_best_mode PROTO((int, int, int, enum machine_mode, int));
 152
 153 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 154
 155 #define GET_MODE_ALIGNMENT(MODE)   \
 156   MIN (BIGGEST_ALIGNMENT,          \
 157        MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
 158
 159 /* For each class, get the narrowest mode in that class.  */
 160
 161 extern enum machine_mode class_narrowest_mode[];
 162 #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
 163
 164 /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
 165    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
 166
 167 extern enum machine_mode byte_mode;
 168 extern enum machine_mode word_mode;
 169 extern enum machine_mode ptr_mode;
 170
 171 #endif /* not HAVE_MACHINE_MODES */