gcc/machmode.h

   1 /* Machine mode definitions for GCC; included by rtl.h and tree.h.
   2    Copyright (C) 1991, 1993, 1994, 1996, 1998, 1999, 2000, 2001, 2003
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, 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 #include "insn-modes.h"
  27
  28 /* Get the name of mode MODE as a string.  */
  29
  30 extern const char * const mode_name[NUM_MACHINE_MODES];
  31 #define GET_MODE_NAME(MODE)  mode_name[MODE]
  32
  33 /* Mode classes.  */
  34
  35 #include "mode-classes.def"
  36 #define DEF_MODE_CLASS(M) M
  37 enum mode_class { MODE_CLASSES, MAX_MODE_CLASS };
  38 #undef DEF_MODE_CLASS
  39 #undef MODE_CLASSES
  40
  41 /* Get the general kind of object that mode MODE represents
  42    (integer, floating, complex, etc.)  */
  43
  44 extern const unsigned char mode_class[NUM_MACHINE_MODES];
  45 #define GET_MODE_CLASS(MODE)  mode_class[MODE]
  46
  47 /* Nonzero if MODE is an integral mode.  */
  48 #define INTEGRAL_MODE_P(MODE)                   \
  49   (GET_MODE_CLASS (MODE) == MODE_INT            \
  50    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
  51    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT \
  52    || GET_MODE_CLASS (MODE) == MODE_VECTOR_INT)
  53
  54 /* Nonzero if MODE is a floating-point mode.  */
  55 #define FLOAT_MODE_P(MODE)              \
  56   (GET_MODE_CLASS (MODE) == MODE_FLOAT  \
  57    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT \
  58    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FLOAT)
  59
  60 /* Nonzero if MODE is a complex mode.  */
  61 #define COMPLEX_MODE_P(MODE)                    \
  62   (GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT    \
  63    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
  64
  65 /* Nonzero if MODE is a vector mode.  */
  66 #define VECTOR_MODE_P(MODE)                     \
  67   (GET_MODE_CLASS (MODE) == MODE_VECTOR_INT     \
  68    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FLOAT)
  69
  70 /* Nonzero if MODE is a scalar integral mode.  */
  71 #define SCALAR_INT_MODE_P(MODE)                 \
  72   (GET_MODE_CLASS (MODE) == MODE_INT            \
  73    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT)
  74
  75 /* Nonzero if MODE is a scalar floating point mode.  */
  76 #define SCALAR_FLOAT_MODE_P(MODE)               \
  77   (GET_MODE_CLASS (MODE) == MODE_FLOAT)
  78
  79 /* Nonzero if CLASS modes can be widened.  */
  80 #define CLASS_HAS_WIDER_MODES_P(CLASS)         \
  81   (CLASS == MODE_INT                           \
  82    || CLASS == MODE_FLOAT                      \
  83    || CLASS == MODE_COMPLEX_FLOAT)
  84
  85 /* Get the size in bytes and bits of an object of mode MODE.  */
  86
  87 extern CONST_MODE_SIZE unsigned char mode_size[NUM_MACHINE_MODES];
  88 #define GET_MODE_SIZE(MODE)    ((unsigned short) mode_size[MODE])
  89 #define GET_MODE_BITSIZE(MODE) ((unsigned short) (GET_MODE_SIZE (MODE) * BITS_PER_UNIT))
  90
  91 /* Get the number of value bits of an object of mode MODE.  */
  92 extern const unsigned short mode_precision[NUM_MACHINE_MODES];
  93 #define GET_MODE_PRECISION(MODE)  mode_precision[MODE]
  94
  95 /* Get a bitmask containing 1 for all bits in a word
  96    that fit within mode MODE.  */
  97
  98 extern const unsigned HOST_WIDE_INT mode_mask_array[NUM_MACHINE_MODES];
  99
 100 #define GET_MODE_MASK(MODE) mode_mask_array[MODE]
 101
 102 /* Return the mode of the inner elements in a vector.  */
 103
 104 extern const unsigned char mode_inner[NUM_MACHINE_MODES];
 105 #define GET_MODE_INNER(MODE) mode_inner[MODE]
 106
 107 /* Get the size in bytes of the basic parts of an object of mode MODE.  */
 108
 109 #define GET_MODE_UNIT_SIZE(MODE)                \
 110   (GET_MODE_INNER (MODE) == VOIDmode            \
 111    ? GET_MODE_SIZE (MODE)                       \
 112    : GET_MODE_SIZE (GET_MODE_INNER (MODE)))
 113
 114 /* Get the number of units in the object.  */
 115
 116 extern const unsigned char mode_nunits[NUM_MACHINE_MODES];
 117 #define GET_MODE_NUNITS(MODE)  mode_nunits[MODE]
 118
 119 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 120
 121 extern const unsigned char mode_wider[NUM_MACHINE_MODES];
 122 #define GET_MODE_WIDER_MODE(MODE) mode_wider[MODE]
 123
 124 extern const unsigned char mode_2xwider[NUM_MACHINE_MODES];
 125 #define GET_MODE_2XWIDER_MODE(MODE) mode_2xwider[MODE]
 126
 127 /* Return the mode for data of a given size SIZE and mode class CLASS.
 128    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 129    The value is BLKmode if no other mode is found.  */
 130
 131 extern enum machine_mode mode_for_size (unsigned int, enum mode_class, int);
 132
 133 /* Similar, but find the smallest mode for a given width.  */
 134
 135 extern enum machine_mode smallest_mode_for_size (unsigned int,
 136                                                  enum mode_class);
 137
 138
 139 /* Return an integer mode of the exact same size as the input mode,
 140    or BLKmode on failure.  */
 141
 142 extern enum machine_mode int_mode_for_mode (enum machine_mode);
 143
 144 /* Find the best mode to use to access a bit field.  */
 145
 146 extern enum machine_mode get_best_mode (int, int, unsigned int,
 147                                         enum machine_mode, int);
 148
 149 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 150
 151 extern CONST_MODE_BASE_ALIGN unsigned char mode_base_align[NUM_MACHINE_MODES];
 152
 153 extern unsigned get_mode_alignment (enum machine_mode);
 154
 155 #define GET_MODE_ALIGNMENT(MODE) get_mode_alignment (MODE)
 156
 157 /* For each class, get the narrowest mode in that class.  */
 158
 159 extern const unsigned char class_narrowest_mode[MAX_MODE_CLASS];
 160 #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[CLASS]
 161
 162 /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
 163    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
 164
 165 extern enum machine_mode byte_mode;
 166 extern enum machine_mode word_mode;
 167 extern enum machine_mode ptr_mode;
 168
 169 /* Target-dependent machine mode initialization - in insn-modes.c.  */
 170 extern void init_adjust_machine_modes (void);
 171
 172 #endif /* not HAVE_MACHINE_MODES */