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    2007, 2008, 2009, 2010 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef HAVE_MACHINE_MODES
  22 #define HAVE_MACHINE_MODES
  23
  24 /* Make an enum class that gives all the machine modes.  */
  25 #include "insn-modes.h"
  26
  27 /* Get the name of mode MODE as a string.  */
  28
  29 extern const char * const mode_name[NUM_MACHINE_MODES];
  30 #define GET_MODE_NAME(MODE)  mode_name[MODE]
  31
  32 /* Mode classes.  */
  33
  34 #include "mode-classes.def"
  35 #define DEF_MODE_CLASS(M) M
  36 enum mode_class { MODE_CLASSES, MAX_MODE_CLASS };
  37 #undef DEF_MODE_CLASS
  38 #undef MODE_CLASSES
  39
  40 /* Get the general kind of object that mode MODE represents
  41    (integer, floating, complex, etc.)  */
  42
  43 extern const unsigned char mode_class[NUM_MACHINE_MODES];
  44 #define GET_MODE_CLASS(MODE)  ((enum mode_class) mode_class[MODE])
  45
  46 /* Nonzero if MODE is an integral mode.  */
  47 #define INTEGRAL_MODE_P(MODE)                   \
  48   (GET_MODE_CLASS (MODE) == MODE_INT            \
  49    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
  50    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT \
  51    || GET_MODE_CLASS (MODE) == MODE_VECTOR_INT)
  52
  53 /* Nonzero if MODE is a floating-point mode.  */
  54 #define FLOAT_MODE_P(MODE)              \
  55   (GET_MODE_CLASS (MODE) == MODE_FLOAT  \
  56    || GET_MODE_CLASS (MODE) == MODE_DECIMAL_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    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FRACT        \
  70    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UFRACT       \
  71    || GET_MODE_CLASS (MODE) == MODE_VECTOR_ACCUM        \
  72    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UACCUM)
  73
  74 /* Nonzero if MODE is a scalar integral mode.  */
  75 #define SCALAR_INT_MODE_P(MODE)                 \
  76   (GET_MODE_CLASS (MODE) == MODE_INT            \
  77    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT)
  78
  79 /* Nonzero if MODE is a scalar floating point mode.  */
  80 #define SCALAR_FLOAT_MODE_P(MODE)               \
  81   (GET_MODE_CLASS (MODE) == MODE_FLOAT          \
  82    || GET_MODE_CLASS (MODE) == MODE_DECIMAL_FLOAT)
  83
  84 /* Nonzero if MODE is a decimal floating point mode.  */
  85 #define DECIMAL_FLOAT_MODE_P(MODE)              \
  86   (GET_MODE_CLASS (MODE) == MODE_DECIMAL_FLOAT)
  87
  88 /* Nonzero if MODE is a scalar fract mode.  */
  89 #define SCALAR_FRACT_MODE_P(MODE)       \
  90   (GET_MODE_CLASS (MODE) == MODE_FRACT)
  91
  92 /* Nonzero if MODE is a scalar ufract mode.  */
  93 #define SCALAR_UFRACT_MODE_P(MODE)      \
  94   (GET_MODE_CLASS (MODE) == MODE_UFRACT)
  95
  96 /* Nonzero if MODE is a scalar fract or ufract mode.  */
  97 #define ALL_SCALAR_FRACT_MODE_P(MODE)   \
  98   (SCALAR_FRACT_MODE_P (MODE) || SCALAR_UFRACT_MODE_P (MODE))
  99
 100 /* Nonzero if MODE is a scalar accum mode.  */
 101 #define SCALAR_ACCUM_MODE_P(MODE)       \
 102   (GET_MODE_CLASS (MODE) == MODE_ACCUM)
 103
 104 /* Nonzero if MODE is a scalar uaccum mode.  */
 105 #define SCALAR_UACCUM_MODE_P(MODE)      \
 106   (GET_MODE_CLASS (MODE) == MODE_UACCUM)
 107
 108 /* Nonzero if MODE is a scalar accum or uaccum mode.  */
 109 #define ALL_SCALAR_ACCUM_MODE_P(MODE)   \
 110   (SCALAR_ACCUM_MODE_P (MODE) || SCALAR_UACCUM_MODE_P (MODE))
 111
 112 /* Nonzero if MODE is a scalar fract or accum mode.  */
 113 #define SIGNED_SCALAR_FIXED_POINT_MODE_P(MODE)  \
 114   (SCALAR_FRACT_MODE_P (MODE) || SCALAR_ACCUM_MODE_P (MODE))
 115
 116 /* Nonzero if MODE is a scalar ufract or uaccum mode.  */
 117 #define UNSIGNED_SCALAR_FIXED_POINT_MODE_P(MODE)        \
 118   (SCALAR_UFRACT_MODE_P (MODE) || SCALAR_UACCUM_MODE_P (MODE))
 119
 120 /* Nonzero if MODE is a scalar fract, ufract, accum or uaccum mode.  */
 121 #define ALL_SCALAR_FIXED_POINT_MODE_P(MODE)     \
 122   (SIGNED_SCALAR_FIXED_POINT_MODE_P (MODE)      \
 123    || UNSIGNED_SCALAR_FIXED_POINT_MODE_P (MODE))
 124
 125 /* Nonzero if MODE is a scalar/vector fract mode.  */
 126 #define FRACT_MODE_P(MODE)              \
 127   (GET_MODE_CLASS (MODE) == MODE_FRACT  \
 128    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FRACT)
 129
 130 /* Nonzero if MODE is a scalar/vector ufract mode.  */
 131 #define UFRACT_MODE_P(MODE)             \
 132   (GET_MODE_CLASS (MODE) == MODE_UFRACT \
 133    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UFRACT)
 134
 135 /* Nonzero if MODE is a scalar/vector fract or ufract mode.  */
 136 #define ALL_FRACT_MODE_P(MODE)          \
 137   (FRACT_MODE_P (MODE) || UFRACT_MODE_P (MODE))
 138
 139 /* Nonzero if MODE is a scalar/vector accum mode.  */
 140 #define ACCUM_MODE_P(MODE)              \
 141   (GET_MODE_CLASS (MODE) == MODE_ACCUM  \
 142    || GET_MODE_CLASS (MODE) == MODE_VECTOR_ACCUM)
 143
 144 /* Nonzero if MODE is a scalar/vector uaccum mode.  */
 145 #define UACCUM_MODE_P(MODE)             \
 146   (GET_MODE_CLASS (MODE) == MODE_UACCUM \
 147    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UACCUM)
 148
 149 /* Nonzero if MODE is a scalar/vector accum or uaccum mode.  */
 150 #define ALL_ACCUM_MODE_P(MODE)          \
 151   (ACCUM_MODE_P (MODE) || UACCUM_MODE_P (MODE))
 152
 153 /* Nonzero if MODE is a scalar/vector fract or accum mode.  */
 154 #define SIGNED_FIXED_POINT_MODE_P(MODE)         \
 155   (FRACT_MODE_P (MODE) || ACCUM_MODE_P (MODE))
 156
 157 /* Nonzero if MODE is a scalar/vector ufract or uaccum mode.  */
 158 #define UNSIGNED_FIXED_POINT_MODE_P(MODE)       \
 159   (UFRACT_MODE_P (MODE) || UACCUM_MODE_P (MODE))
 160
 161 /* Nonzero if MODE is a scalar/vector fract, ufract, accum or uaccum mode.  */
 162 #define ALL_FIXED_POINT_MODE_P(MODE)            \
 163   (SIGNED_FIXED_POINT_MODE_P (MODE)             \
 164    || UNSIGNED_FIXED_POINT_MODE_P (MODE))
 165
 166 /* Nonzero if CLASS modes can be widened.  */
 167 #define CLASS_HAS_WIDER_MODES_P(CLASS)         \
 168   (CLASS == MODE_INT                           \
 169    || CLASS == MODE_PARTIAL_INT                \
 170    || CLASS == MODE_FLOAT                      \
 171    || CLASS == MODE_DECIMAL_FLOAT              \
 172    || CLASS == MODE_COMPLEX_FLOAT              \
 173    || CLASS == MODE_FRACT                      \
 174    || CLASS == MODE_UFRACT                     \
 175    || CLASS == MODE_ACCUM                      \
 176    || CLASS == MODE_UACCUM)
 177
 178 /* Get the size in bytes and bits of an object of mode MODE.  */
 179
 180 extern CONST_MODE_SIZE unsigned char mode_size[NUM_MACHINE_MODES];
 181 #define GET_MODE_SIZE(MODE)    ((unsigned short) mode_size[MODE])
 182 #define GET_MODE_BITSIZE(MODE) ((unsigned short) (GET_MODE_SIZE (MODE) * BITS_PER_UNIT))
 183
 184 /* Get the number of value bits of an object of mode MODE.  */
 185 extern const unsigned short mode_precision[NUM_MACHINE_MODES];
 186 #define GET_MODE_PRECISION(MODE)  mode_precision[MODE]
 187
 188 /* Get the number of integral bits of an object of mode MODE.  */
 189 extern CONST_MODE_IBIT unsigned char mode_ibit[NUM_MACHINE_MODES];
 190 #define GET_MODE_IBIT(MODE) mode_ibit[MODE]
 191
 192 /* Get the number of fractional bits of an object of mode MODE.  */
 193 extern CONST_MODE_FBIT unsigned char mode_fbit[NUM_MACHINE_MODES];
 194 #define GET_MODE_FBIT(MODE) mode_fbit[MODE]
 195
 196 /* Get a bitmask containing 1 for all bits in a word
 197    that fit within mode MODE.  */
 198
 199 extern const unsigned HOST_WIDE_INT mode_mask_array[NUM_MACHINE_MODES];
 200
 201 #define GET_MODE_MASK(MODE) mode_mask_array[MODE]
 202
 203 /* Return the mode of the inner elements in a vector.  */
 204
 205 extern const unsigned char mode_inner[NUM_MACHINE_MODES];
 206 #define GET_MODE_INNER(MODE) ((enum machine_mode) mode_inner[MODE])
 207
 208 /* Get the size in bytes of the basic parts of an object of mode MODE.  */
 209
 210 #define GET_MODE_UNIT_SIZE(MODE)                \
 211   (GET_MODE_INNER (MODE) == VOIDmode            \
 212    ? GET_MODE_SIZE (MODE)                       \
 213    : GET_MODE_SIZE (GET_MODE_INNER (MODE)))
 214
 215 /* Get the number of units in the object.  */
 216
 217 extern const unsigned char mode_nunits[NUM_MACHINE_MODES];
 218 #define GET_MODE_NUNITS(MODE)  mode_nunits[MODE]
 219
 220 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 221
 222 extern const unsigned char mode_wider[NUM_MACHINE_MODES];
 223 #define GET_MODE_WIDER_MODE(MODE) ((enum machine_mode) mode_wider[MODE])
 224
 225 /* For scalars, this is a mode with twice the precision.  For vectors,
 226    this is a mode with the same inner mode but with twice the elements.  */
 227 extern const unsigned char mode_2xwider[NUM_MACHINE_MODES];
 228 #define GET_MODE_2XWIDER_MODE(MODE) ((enum machine_mode) mode_2xwider[MODE])
 229
 230 /* Return the mode for data of a given size SIZE and mode class CLASS.
 231    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 232    The value is BLKmode if no other mode is found.  */
 233
 234 extern enum machine_mode mode_for_size (unsigned int, enum mode_class, int);
 235
 236 /* Similar, but find the smallest mode for a given width.  */
 237
 238 extern enum machine_mode smallest_mode_for_size (unsigned int,
 239                                                  enum mode_class);
 240
 241
 242 /* Return an integer mode of the exact same size as the input mode,
 243    or BLKmode on failure.  */
 244
 245 extern enum machine_mode int_mode_for_mode (enum machine_mode);
 246
 247 /* Return a mode that is suitable for representing a vector,
 248    or BLKmode on failure.  */
 249
 250 extern enum machine_mode mode_for_vector (enum machine_mode, unsigned);
 251
 252 /* Find the best mode to use to access a bit field.  */
 253
 254 extern enum machine_mode get_best_mode (int, int,
 255                                         unsigned HOST_WIDE_INT,
 256                                         unsigned HOST_WIDE_INT,
 257                                         unsigned int,
 258                                         enum machine_mode, int);
 259
 260 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 261
 262 extern CONST_MODE_BASE_ALIGN unsigned char mode_base_align[NUM_MACHINE_MODES];
 263
 264 extern unsigned get_mode_alignment (enum machine_mode);
 265
 266 #define GET_MODE_ALIGNMENT(MODE) get_mode_alignment (MODE)
 267
 268 /* For each class, get the narrowest mode in that class.  */
 269
 270 extern const unsigned char class_narrowest_mode[MAX_MODE_CLASS];
 271 #define GET_CLASS_NARROWEST_MODE(CLASS) \
 272   ((enum machine_mode) class_narrowest_mode[CLASS])
 273
 274 /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
 275    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
 276
 277 extern enum machine_mode byte_mode;
 278 extern enum machine_mode word_mode;
 279 extern enum machine_mode ptr_mode;
 280
 281 /* Target-dependent machine mode initialization - in insn-modes.c.  */
 282 extern void init_adjust_machine_modes (void);
 283
 284 #define TRULY_NOOP_TRUNCATION_MODES_P(MODE1, MODE2) \
 285   TRULY_NOOP_TRUNCATION (GET_MODE_PRECISION (MODE1), \
 286                          GET_MODE_PRECISION (MODE2))
 287
 288 #define HWI_COMPUTABLE_MODE_P(MODE) \
 289   (SCALAR_INT_MODE_P (MODE) \
 290    && GET_MODE_PRECISION (MODE) <= HOST_BITS_PER_WIDE_INT)
 291
 292 #endif /* not HAVE_MACHINE_MODES */