gcc/machmode.h

   1 /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
   2    Copyright (C) 1991, 93, 94, 96, 98, 99, 2000 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 /* Make an enum class that gives all the machine modes.  */
  25
  26 #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
  27
  28 enum machine_mode {
  29 #include "machmode.def"
  30 MAX_MACHINE_MODE };
  31
  32 #undef DEF_MACHMODE
  33
  34 #ifndef NUM_MACHINE_MODES
  35 #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
  36 #endif
  37
  38 /* Get the name of mode MODE as a string.  */
  39
  40 extern const char * const mode_name[];
  41 #define GET_MODE_NAME(MODE)             (mode_name[(int) (MODE)])
  42
  43 enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
  44                   MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
  45
  46 /* Get the general kind of object that mode MODE represents
  47    (integer, floating, complex, etc.)  */
  48
  49 extern const enum mode_class mode_class[];
  50 #define GET_MODE_CLASS(MODE)            (mode_class[(int) (MODE)])
  51
  52 /* Nonzero if MODE is an integral mode.  */
  53 #define INTEGRAL_MODE_P(MODE)                   \
  54   (GET_MODE_CLASS (MODE) == MODE_INT            \
  55    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
  56    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT)
  57
  58 /* Nonzero if MODE is a floating-point mode.  */
  59 #define FLOAT_MODE_P(MODE)              \
  60   (GET_MODE_CLASS (MODE) == MODE_FLOAT  \
  61    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
  62
  63 /* Nonzero if MODE is a complex mode.  */
  64 #define COMPLEX_MODE_P(MODE)                    \
  65   (GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT    \
  66    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
  67
  68 /* Get the size in bytes of an object of mode MODE.  */
  69
  70 extern const int mode_size[];
  71 #define GET_MODE_SIZE(MODE)             (mode_size[(int) (MODE)])
  72
  73 /* Get the size in bytes of the basic parts of an object of mode MODE.  */
  74
  75 extern const int mode_unit_size[];
  76 #define GET_MODE_UNIT_SIZE(MODE)        (mode_unit_size[(int) (MODE)])
  77
  78 /* Get the number of units in the object.  */
  79
  80 #define GET_MODE_NUNITS(MODE)  \
  81   ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
  82    : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
  83
  84 /* Get the size in bits of an object of mode MODE.  */
  85
  86 #define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int) (MODE)])
  87
  88 #ifdef HOST_WIDE_INT
  89
  90 /* Get a bitmask containing 1 for all bits in a word
  91    that fit within mode MODE.  */
  92
  93 extern const unsigned HOST_WIDE_INT mode_mask_array[];
  94
  95 #define GET_MODE_MASK(MODE) mode_mask_array[(int) (MODE)]
  96
  97 #endif /* HOST_WIDE_INT */
  98
  99 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 100
 101 extern const unsigned char mode_wider_mode[];
 102 #define GET_MODE_WIDER_MODE(MODE)       ((enum machine_mode)mode_wider_mode[(int) (MODE)])
 103
 104 /* Return the mode for data of a given size SIZE and mode class CLASS.
 105    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 106    The value is BLKmode if no other mode is found.  */
 107
 108 extern enum machine_mode mode_for_size PARAMS ((unsigned int, enum mode_class, int));
 109
 110 /* Similar, but find the smallest mode for a given width.  */
 111
 112 extern enum machine_mode smallest_mode_for_size  PARAMS ((unsigned int,
 113                                                         enum mode_class));
 114
 115
 116 /* Return an integer mode of the exact same size as the input mode,
 117    or BLKmode on failure.  */
 118
 119 extern enum machine_mode int_mode_for_mode PARAMS ((enum machine_mode));
 120
 121 /* Find the best mode to use to access a bit field.  */
 122
 123 extern enum machine_mode get_best_mode PARAMS ((int, int, int, enum machine_mode, int));
 124
 125 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 126
 127 #define GET_MODE_ALIGNMENT(MODE)   \
 128   MIN (BIGGEST_ALIGNMENT,          \
 129        MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
 130
 131 /* For each class, get the narrowest mode in that class.  */
 132
 133 extern const enum machine_mode class_narrowest_mode[];
 134 #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int) (CLASS)]
 135
 136 /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
 137    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
 138
 139 extern enum machine_mode byte_mode;
 140 extern enum machine_mode word_mode;
 141 extern enum machine_mode ptr_mode;
 142
 143 #endif /* not HAVE_MACHINE_MODES */