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, 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 /* Provide a default way to print an address in hex via printf.  */
  60
  61 #ifndef HOST_PTR_PRINTF
  62 #define HOST_PTR_PRINTF sizeof (int) == sizeof (char *) ? "%x" : "%lx"
  63 #endif
  64
  65 /* Make an enum class that gives all the machine modes.  */
  66
  67 #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
  68
  69 enum machine_mode {
  70 #include "machmode.def"
  71
  72 #ifdef EXTRA_CC_MODES
  73   EXTRA_CC_MODES,
  74 #endif
  75 MAX_MACHINE_MODE };
  76
  77 #undef DEF_MACHMODE
  78
  79 #define HAVE_MACHINE_MODES
  80
  81 #ifndef NUM_MACHINE_MODES
  82 #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
  83 #endif
  84
  85 /* Get the name of mode MODE as a string.  */
  86
  87 extern char *mode_name[];
  88 #define GET_MODE_NAME(MODE)             (mode_name[(int)(MODE)])
  89
  90 enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
  91                   MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
  92
  93 /* Get the general kind of object that mode MODE represents
  94    (integer, floating, complex, etc.)  */
  95
  96 extern enum mode_class mode_class[];
  97 #define GET_MODE_CLASS(MODE)            (mode_class[(int)(MODE)])
  98
  99 /* Nonzero if MODE is an integral mode.  */
 100 #define INTEGRAL_MODE_P(MODE)                   \
 101   (GET_MODE_CLASS (MODE) == MODE_INT            \
 102    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
 103    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT)
 104
 105 /* Nonzero if MODE is a floating-point mode.  */
 106 #define FLOAT_MODE_P(MODE)              \
 107   (GET_MODE_CLASS (MODE) == MODE_FLOAT  \
 108    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
 109
 110 /* Get the size in bytes of an object of mode MODE.  */
 111
 112 extern int mode_size[];
 113 #define GET_MODE_SIZE(MODE)             (mode_size[(int)(MODE)])
 114
 115 /* Get the size in bytes of the basic parts of an object of mode MODE.  */
 116
 117 extern int mode_unit_size[];
 118 #define GET_MODE_UNIT_SIZE(MODE)        (mode_unit_size[(int)(MODE)])
 119
 120 /* Get the number of units in the object.  */
 121
 122 #define GET_MODE_NUNITS(MODE)  \
 123   ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
 124    : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
 125
 126 /* Get the size in bits of an object of mode MODE.  */
 127
 128 #define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int)(MODE)])
 129
 130 /* Get a bitmask containing 1 for all bits in a word
 131    that fit within mode MODE.  */
 132
 133 #define GET_MODE_MASK(MODE)  \
 134    ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_WIDE_INT)  \
 135     ?(HOST_WIDE_INT) ~0 : (((HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (MODE)) - 1))
 136
 137 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 138
 139 extern enum machine_mode mode_wider_mode[];
 140 #define GET_MODE_WIDER_MODE(MODE)       (mode_wider_mode[(int)(MODE)])
 141
 142 /* Return the mode for data of a given size SIZE and mode class CLASS.
 143    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 144    The value is BLKmode if no other mode is found.  */
 145
 146 extern enum machine_mode mode_for_size PROTO((unsigned int, enum mode_class, int));
 147
 148 /* Find the best mode to use to access a bit field.  */
 149
 150 extern enum machine_mode get_best_mode PROTO((int, int, int, enum machine_mode, int));
 151
 152 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 153
 154 #define GET_MODE_ALIGNMENT(MODE)   \
 155   MIN (BIGGEST_ALIGNMENT,          \
 156        MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
 157
 158 /* For each class, get the narrowest mode in that class.  */
 159
 160 extern enum machine_mode class_narrowest_mode[];
 161 #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
 162
 163 /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
 164    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
 165
 166 extern enum machine_mode byte_mode;
 167 extern enum machine_mode word_mode;
 168 extern enum machine_mode ptr_mode;
 169
 170 #endif /* not HAVE_MACHINE_MODES */