gcc/machmode.h

   1 /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
   2    Copyright (C) 1991, 1993, 1994, 1996, 1998, 1999, 2000
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef HAVE_MACHINE_MODES
  23 #define HAVE_MACHINE_MODES
  24
  25 /* Make an enum class that gives all the machine modes.  */
  26
  27 #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,
  28
  29 enum machine_mode {
  30 #include "machmode.def"
  31 MAX_MACHINE_MODE };
  32
  33 #undef DEF_MACHMODE
  34
  35 #ifndef NUM_MACHINE_MODES
  36 #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
  37 #endif
  38
  39 /* Get the name of mode MODE as a string.  */
  40
  41 extern const char * const mode_name[];
  42 #define GET_MODE_NAME(MODE)             (mode_name[(int) (MODE)])
  43
  44 enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
  45                   MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
  46
  47 /* Get the general kind of object that mode MODE represents
  48    (integer, floating, complex, etc.)  */
  49
  50 extern const enum mode_class mode_class[];
  51 #define GET_MODE_CLASS(MODE)            (mode_class[(int) (MODE)])
  52
  53 /* Nonzero if MODE is an integral mode.  */
  54 #define INTEGRAL_MODE_P(MODE)                   \
  55   (GET_MODE_CLASS (MODE) == MODE_INT            \
  56    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
  57    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT)
  58
  59 /* Nonzero if MODE is a floating-point mode.  */
  60 #define FLOAT_MODE_P(MODE)              \
  61   (GET_MODE_CLASS (MODE) == MODE_FLOAT  \
  62    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
  63
  64 /* Nonzero if MODE is a complex mode.  */
  65 #define COMPLEX_MODE_P(MODE)                    \
  66   (GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT    \
  67    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
  68
  69 /* Get the size in bytes of an object of mode MODE.  */
  70
  71 extern const unsigned int mode_size[];
  72 #define GET_MODE_SIZE(MODE)             (mode_size[(int) (MODE)])
  73
  74 /* Get the size in bytes of the basic parts of an object of mode MODE.  */
  75
  76 extern const unsigned int mode_unit_size[];
  77 #define GET_MODE_UNIT_SIZE(MODE)        (mode_unit_size[(int) (MODE)])
  78
  79 /* Get the number of units in the object.  */
  80
  81 #define GET_MODE_NUNITS(MODE)  \
  82   ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
  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 #ifdef HOST_WIDE_INT
  90
  91 /* Get a bitmask containing 1 for all bits in a word
  92    that fit within mode MODE.  */
  93
  94 extern const unsigned HOST_WIDE_INT mode_mask_array[];
  95
  96 #define GET_MODE_MASK(MODE) mode_mask_array[(int) (MODE)]
  97
  98 #endif /* HOST_WIDE_INT */
  99
 100 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 101
 102 extern const unsigned char mode_wider_mode[];
 103 #define GET_MODE_WIDER_MODE(MODE)       ((enum machine_mode)mode_wider_mode[(int) (MODE)])
 104
 105 /* Return the mode for data of a given size SIZE and mode class CLASS.
 106    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 107    The value is BLKmode if no other mode is found.  */
 108
 109 extern enum machine_mode mode_for_size PARAMS ((unsigned int,
 110                                                 enum mode_class, int));
 111
 112 /* Similar, but find the smallest mode for a given width.  */
 113
 114 extern enum machine_mode smallest_mode_for_size
 115                                 PARAMS ((unsigned int, enum mode_class));
 116
 117
 118 /* Return an integer mode of the exact same size as the input mode,
 119    or BLKmode on failure.  */
 120
 121 extern enum machine_mode int_mode_for_mode PARAMS ((enum machine_mode));
 122
 123 /* Find the best mode to use to access a bit field.  */
 124
 125 extern enum machine_mode get_best_mode PARAMS ((int, int, unsigned int,
 126                                                 enum machine_mode, int));
 127
 128 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 129
 130 extern unsigned get_mode_alignment PARAMS ((enum machine_mode));
 131
 132 #define GET_MODE_ALIGNMENT(MODE) get_mode_alignment (MODE)
 133
 134 /* For each class, get the narrowest mode in that class.  */
 135
 136 extern const enum machine_mode class_narrowest_mode[];
 137 #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int) (CLASS)]
 138
 139 /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
 140    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
 141
 142 extern enum machine_mode byte_mode;
 143 extern enum machine_mode word_mode;
 144 extern enum machine_mode ptr_mode;
 145
 146 #endif /* not HAVE_MACHINE_MODES */