gcc/machmode.h

   1 /* Machine mode definitions for GCC; included by rtl.h and tree.h.
   2    Copyright (C) 1991-2013 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef HAVE_MACHINE_MODES
  21 #define HAVE_MACHINE_MODES
  22
  23 /* Make an enum class that gives all the machine modes.  */
  24 #include "insn-modes.h"
  25
  26 /* Get the name of mode MODE as a string.  */
  27
  28 extern const char * const mode_name[NUM_MACHINE_MODES];
  29 #define GET_MODE_NAME(MODE)  mode_name[MODE]
  30
  31 /* Mode classes.  */
  32
  33 #include "mode-classes.def"
  34 #define DEF_MODE_CLASS(M) M
  35 enum mode_class { MODE_CLASSES, MAX_MODE_CLASS };
  36 #undef DEF_MODE_CLASS
  37 #undef MODE_CLASSES
  38
  39 /* Get the general kind of object that mode MODE represents
  40    (integer, floating, complex, etc.)  */
  41
  42 extern const unsigned char mode_class[NUM_MACHINE_MODES];
  43 #define GET_MODE_CLASS(MODE)  ((enum mode_class) mode_class[MODE])
  44
  45 /* Nonzero if MODE is an integral mode.  */
  46 #define INTEGRAL_MODE_P(MODE)                   \
  47   (GET_MODE_CLASS (MODE) == MODE_INT            \
  48    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
  49    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT \
  50    || GET_MODE_CLASS (MODE) == MODE_VECTOR_INT)
  51
  52 /* Nonzero if MODE is a floating-point mode.  */
  53 #define FLOAT_MODE_P(MODE)              \
  54   (GET_MODE_CLASS (MODE) == MODE_FLOAT  \
  55    || GET_MODE_CLASS (MODE) == MODE_DECIMAL_FLOAT \
  56    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT \
  57    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FLOAT)
  58
  59 /* Nonzero if MODE is a complex mode.  */
  60 #define COMPLEX_MODE_P(MODE)                    \
  61   (GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT    \
  62    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
  63
  64 /* Nonzero if MODE is a vector mode.  */
  65 #define VECTOR_MODE_P(MODE)                     \
  66   (GET_MODE_CLASS (MODE) == MODE_VECTOR_INT     \
  67    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FLOAT        \
  68    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FRACT        \
  69    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UFRACT       \
  70    || GET_MODE_CLASS (MODE) == MODE_VECTOR_ACCUM        \
  71    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UACCUM)
  72
  73 /* Nonzero if MODE is a scalar integral mode.  */
  74 #define SCALAR_INT_MODE_P(MODE)                 \
  75   (GET_MODE_CLASS (MODE) == MODE_INT            \
  76    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT)
  77
  78 /* Nonzero if MODE is a scalar floating point mode.  */
  79 #define SCALAR_FLOAT_MODE_P(MODE)               \
  80   (GET_MODE_CLASS (MODE) == MODE_FLOAT          \
  81    || GET_MODE_CLASS (MODE) == MODE_DECIMAL_FLOAT)
  82
  83 /* Nonzero if MODE is a decimal floating point mode.  */
  84 #define DECIMAL_FLOAT_MODE_P(MODE)              \
  85   (GET_MODE_CLASS (MODE) == MODE_DECIMAL_FLOAT)
  86
  87 /* Nonzero if MODE is a scalar fract mode.  */
  88 #define SCALAR_FRACT_MODE_P(MODE)       \
  89   (GET_MODE_CLASS (MODE) == MODE_FRACT)
  90
  91 /* Nonzero if MODE is a scalar ufract mode.  */
  92 #define SCALAR_UFRACT_MODE_P(MODE)      \
  93   (GET_MODE_CLASS (MODE) == MODE_UFRACT)
  94
  95 /* Nonzero if MODE is a scalar fract or ufract mode.  */
  96 #define ALL_SCALAR_FRACT_MODE_P(MODE)   \
  97   (SCALAR_FRACT_MODE_P (MODE) || SCALAR_UFRACT_MODE_P (MODE))
  98
  99 /* Nonzero if MODE is a scalar accum mode.  */
 100 #define SCALAR_ACCUM_MODE_P(MODE)       \
 101   (GET_MODE_CLASS (MODE) == MODE_ACCUM)
 102
 103 /* Nonzero if MODE is a scalar uaccum mode.  */
 104 #define SCALAR_UACCUM_MODE_P(MODE)      \
 105   (GET_MODE_CLASS (MODE) == MODE_UACCUM)
 106
 107 /* Nonzero if MODE is a scalar accum or uaccum mode.  */
 108 #define ALL_SCALAR_ACCUM_MODE_P(MODE)   \
 109   (SCALAR_ACCUM_MODE_P (MODE) || SCALAR_UACCUM_MODE_P (MODE))
 110
 111 /* Nonzero if MODE is a scalar fract or accum mode.  */
 112 #define SIGNED_SCALAR_FIXED_POINT_MODE_P(MODE)  \
 113   (SCALAR_FRACT_MODE_P (MODE) || SCALAR_ACCUM_MODE_P (MODE))
 114
 115 /* Nonzero if MODE is a scalar ufract or uaccum mode.  */
 116 #define UNSIGNED_SCALAR_FIXED_POINT_MODE_P(MODE)        \
 117   (SCALAR_UFRACT_MODE_P (MODE) || SCALAR_UACCUM_MODE_P (MODE))
 118
 119 /* Nonzero if MODE is a scalar fract, ufract, accum or uaccum mode.  */
 120 #define ALL_SCALAR_FIXED_POINT_MODE_P(MODE)     \
 121   (SIGNED_SCALAR_FIXED_POINT_MODE_P (MODE)      \
 122    || UNSIGNED_SCALAR_FIXED_POINT_MODE_P (MODE))
 123
 124 /* Nonzero if MODE is a scalar/vector fract mode.  */
 125 #define FRACT_MODE_P(MODE)              \
 126   (GET_MODE_CLASS (MODE) == MODE_FRACT  \
 127    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FRACT)
 128
 129 /* Nonzero if MODE is a scalar/vector ufract mode.  */
 130 #define UFRACT_MODE_P(MODE)             \
 131   (GET_MODE_CLASS (MODE) == MODE_UFRACT \
 132    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UFRACT)
 133
 134 /* Nonzero if MODE is a scalar/vector fract or ufract mode.  */
 135 #define ALL_FRACT_MODE_P(MODE)          \
 136   (FRACT_MODE_P (MODE) || UFRACT_MODE_P (MODE))
 137
 138 /* Nonzero if MODE is a scalar/vector accum mode.  */
 139 #define ACCUM_MODE_P(MODE)              \
 140   (GET_MODE_CLASS (MODE) == MODE_ACCUM  \
 141    || GET_MODE_CLASS (MODE) == MODE_VECTOR_ACCUM)
 142
 143 /* Nonzero if MODE is a scalar/vector uaccum mode.  */
 144 #define UACCUM_MODE_P(MODE)             \
 145   (GET_MODE_CLASS (MODE) == MODE_UACCUM \
 146    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UACCUM)
 147
 148 /* Nonzero if MODE is a scalar/vector accum or uaccum mode.  */
 149 #define ALL_ACCUM_MODE_P(MODE)          \
 150   (ACCUM_MODE_P (MODE) || UACCUM_MODE_P (MODE))
 151
 152 /* Nonzero if MODE is a scalar/vector fract or accum mode.  */
 153 #define SIGNED_FIXED_POINT_MODE_P(MODE)         \
 154   (FRACT_MODE_P (MODE) || ACCUM_MODE_P (MODE))
 155
 156 /* Nonzero if MODE is a scalar/vector ufract or uaccum mode.  */
 157 #define UNSIGNED_FIXED_POINT_MODE_P(MODE)       \
 158   (UFRACT_MODE_P (MODE) || UACCUM_MODE_P (MODE))
 159
 160 /* Nonzero if MODE is a scalar/vector fract, ufract, accum or uaccum mode.  */
 161 #define ALL_FIXED_POINT_MODE_P(MODE)            \
 162   (SIGNED_FIXED_POINT_MODE_P (MODE)             \
 163    || UNSIGNED_FIXED_POINT_MODE_P (MODE))
 164
 165 /* Nonzero if CLASS modes can be widened.  */
 166 #define CLASS_HAS_WIDER_MODES_P(CLASS)         \
 167   (CLASS == MODE_INT                           \
 168    || CLASS == MODE_PARTIAL_INT                \
 169    || CLASS == MODE_FLOAT                      \
 170    || CLASS == MODE_DECIMAL_FLOAT              \
 171    || CLASS == MODE_COMPLEX_FLOAT              \
 172    || CLASS == MODE_FRACT                      \
 173    || CLASS == MODE_UFRACT                     \
 174    || CLASS == MODE_ACCUM                      \
 175    || CLASS == MODE_UACCUM)
 176
 177 /* Get the size in bytes and bits of an object of mode MODE.  */
 178
 179 extern CONST_MODE_SIZE unsigned char mode_size[NUM_MACHINE_MODES];
 180 #define GET_MODE_SIZE(MODE)    ((unsigned short) mode_size[MODE])
 181 #define GET_MODE_BITSIZE(MODE) \
 182   ((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 or bites of the basic parts of an
 209    object of mode MODE.  */
 210
 211 #define GET_MODE_UNIT_SIZE(MODE)                \
 212   (GET_MODE_INNER (MODE) == VOIDmode            \
 213    ? GET_MODE_SIZE (MODE)                       \
 214    : GET_MODE_SIZE (GET_MODE_INNER (MODE)))
 215
 216 #define GET_MODE_UNIT_BITSIZE(MODE) \
 217   ((unsigned short) (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT))
 218
 219 #define GET_MODE_UNIT_PRECISION(MODE)           \
 220   (GET_MODE_INNER (MODE) == VOIDmode            \
 221    ? GET_MODE_PRECISION (MODE)                  \
 222    : GET_MODE_PRECISION (GET_MODE_INNER (MODE)))
 223
 224 /* Get the number of units in the object.  */
 225
 226 extern const unsigned char mode_nunits[NUM_MACHINE_MODES];
 227 #define GET_MODE_NUNITS(MODE)  mode_nunits[MODE]
 228
 229 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 230
 231 extern const unsigned char mode_wider[NUM_MACHINE_MODES];
 232 #define GET_MODE_WIDER_MODE(MODE) ((enum machine_mode) mode_wider[MODE])
 233
 234 /* For scalars, this is a mode with twice the precision.  For vectors,
 235    this is a mode with the same inner mode but with twice the elements.  */
 236 extern const unsigned char mode_2xwider[NUM_MACHINE_MODES];
 237 #define GET_MODE_2XWIDER_MODE(MODE) ((enum machine_mode) mode_2xwider[MODE])
 238
 239 /* Return the mode for data of a given size SIZE and mode class CLASS.
 240    If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
 241    The value is BLKmode if no other mode is found.  */
 242
 243 extern enum machine_mode mode_for_size (unsigned int, enum mode_class, int);
 244
 245 /* Similar, but find the smallest mode for a given width.  */
 246
 247 extern enum machine_mode smallest_mode_for_size (unsigned int,
 248                                                  enum mode_class);
 249
 250
 251 /* Return an integer mode of the exact same size as the input mode,
 252    or BLKmode on failure.  */
 253
 254 extern enum machine_mode int_mode_for_mode (enum machine_mode);
 255
 256 /* Return a mode that is suitable for representing a vector,
 257    or BLKmode on failure.  */
 258
 259 extern enum machine_mode mode_for_vector (enum machine_mode, unsigned);
 260
 261 /* A class for iterating through possible bitfield modes.  */
 262 class bit_field_mode_iterator
 263 {
 264 public:
 265   bit_field_mode_iterator (HOST_WIDE_INT, HOST_WIDE_INT,
 266                            HOST_WIDE_INT, HOST_WIDE_INT,
 267                            unsigned int, bool);
 268   bool next_mode (enum machine_mode *);
 269   bool prefer_smaller_modes ();
 270
 271 private:
 272   enum machine_mode mode_;
 273   /* We use signed values here because the bit position can be negative
 274      for invalid input such as gcc.dg/pr48335-8.c.  */
 275   HOST_WIDE_INT bitsize_;
 276   HOST_WIDE_INT bitpos_;
 277   HOST_WIDE_INT bitregion_start_;
 278   HOST_WIDE_INT bitregion_end_;
 279   unsigned int align_;
 280   bool volatilep_;
 281   int count_;
 282 };
 283
 284 /* Find the best mode to use to access a bit field.  */
 285
 286 extern enum machine_mode get_best_mode (int, int,
 287                                         unsigned HOST_WIDE_INT,
 288                                         unsigned HOST_WIDE_INT,
 289                                         unsigned int,
 290                                         enum machine_mode, bool);
 291
 292 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 293
 294 extern CONST_MODE_BASE_ALIGN unsigned char mode_base_align[NUM_MACHINE_MODES];
 295
 296 extern unsigned get_mode_alignment (enum machine_mode);
 297
 298 #define GET_MODE_ALIGNMENT(MODE) get_mode_alignment (MODE)
 299
 300 /* Get the precision of the mode or its inner mode if it has one.  */
 301
 302 extern unsigned int element_precision (enum machine_mode);
 303
 304 /* For each class, get the narrowest mode in that class.  */
 305
 306 extern const unsigned char class_narrowest_mode[MAX_MODE_CLASS];
 307 #define GET_CLASS_NARROWEST_MODE(CLASS) \
 308   ((enum machine_mode) class_narrowest_mode[CLASS])
 309
 310 /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
 311    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
 312
 313 extern enum machine_mode byte_mode;
 314 extern enum machine_mode word_mode;
 315 extern enum machine_mode ptr_mode;
 316
 317 /* Target-dependent machine mode initialization - in insn-modes.c.  */
 318 extern void init_adjust_machine_modes (void);
 319
 320 #define TRULY_NOOP_TRUNCATION_MODES_P(MODE1, MODE2) \
 321   TRULY_NOOP_TRUNCATION (GET_MODE_PRECISION (MODE1), \
 322                          GET_MODE_PRECISION (MODE2))
 323
 324 #define HWI_COMPUTABLE_MODE_P(MODE) \
 325   (SCALAR_INT_MODE_P (MODE) \
 326    && GET_MODE_PRECISION (MODE) <= HOST_BITS_PER_WIDE_INT)
 327
 328 #endif /* not HAVE_MACHINE_MODES */