gcc/machmode.h

   1 /* Machine mode definitions for GCC; included by rtl.h and tree.h.
   2    Copyright (C) 1991-2021 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 typedef opt_mode<machine_mode> opt_machine_mode;
  24
  25 extern CONST_MODE_SIZE poly_uint16_pod mode_size[NUM_MACHINE_MODES];
  26 extern CONST_MODE_PRECISION poly_uint16_pod mode_precision[NUM_MACHINE_MODES];
  27 extern const unsigned char mode_inner[NUM_MACHINE_MODES];
  28 extern CONST_MODE_NUNITS poly_uint16_pod mode_nunits[NUM_MACHINE_MODES];
  29 extern CONST_MODE_UNIT_SIZE unsigned char mode_unit_size[NUM_MACHINE_MODES];
  30 extern const unsigned short mode_unit_precision[NUM_MACHINE_MODES];
  31 extern const unsigned char mode_wider[NUM_MACHINE_MODES];
  32 extern const unsigned char mode_2xwider[NUM_MACHINE_MODES];
  33
  34 template<typename T>
  35 struct mode_traits
  36 {
  37   /* For use by the machmode support code only.
  38
  39      There are cases in which the machmode support code needs to forcibly
  40      convert a machine_mode to a specific mode class T, and in which the
  41      context guarantees that this is valid without the need for an assert.
  42      This can be done using:
  43
  44        return typename mode_traits<T>::from_int (mode);
  45
  46      when returning a T and:
  47
  48        res = T (typename mode_traits<T>::from_int (mode));
  49
  50      when assigning to a value RES that must be assignment-compatible
  51      with (but possibly not the same as) T.  */
  52 #ifdef USE_ENUM_MODES
  53   /* Allow direct conversion of enums to specific mode classes only
  54      when USE_ENUM_MODES is defined.  This is only intended for use
  55      by gencondmd, so that it can tell more easily when .md conditions
  56      are always false.  */
  57   typedef machine_mode from_int;
  58 #else
  59   /* Here we use an enum type distinct from machine_mode but with the
  60      same range as machine_mode.  T should have a constructor that
  61      accepts this enum type; it should not have a constructor that
  62      accepts machine_mode.
  63
  64      We use this somewhat indirect approach to avoid too many constructor
  65      calls when the compiler is built with -O0.  For example, even in
  66      unoptimized code, the return statement above would construct the
  67      returned T directly from the numerical value of MODE.  */
  68   enum from_int { dummy = MAX_MACHINE_MODE };
  69 #endif
  70 };
  71
  72 template<>
  73 struct mode_traits<machine_mode>
  74 {
  75   /* machine_mode itself needs no conversion.  */
  76   typedef machine_mode from_int;
  77 };
  78
  79 /* Always treat machine modes as fixed-size while compiling code specific
  80    to targets that have no variable-size modes.  */
  81 #if defined (IN_TARGET_CODE) && NUM_POLY_INT_COEFFS == 1
  82 #define ONLY_FIXED_SIZE_MODES 1
  83 #else
  84 #define ONLY_FIXED_SIZE_MODES 0
  85 #endif
  86
  87 /* Get the name of mode MODE as a string.  */
  88
  89 extern const char * const mode_name[NUM_MACHINE_MODES];
  90 #define GET_MODE_NAME(MODE)  mode_name[MODE]
  91
  92 /* Mode classes.  */
  93
  94 #include "mode-classes.def"
  95 #define DEF_MODE_CLASS(M) M
  96 enum mode_class { MODE_CLASSES, MAX_MODE_CLASS };
  97 #undef DEF_MODE_CLASS
  98 #undef MODE_CLASSES
  99
 100 /* Get the general kind of object that mode MODE represents
 101    (integer, floating, complex, etc.)  */
 102
 103 extern const unsigned char mode_class[NUM_MACHINE_MODES];
 104 #define GET_MODE_CLASS(MODE)  ((enum mode_class) mode_class[MODE])
 105
 106 /* Nonzero if MODE is an integral mode.  */
 107 #define INTEGRAL_MODE_P(MODE)                   \
 108   (GET_MODE_CLASS (MODE) == MODE_INT            \
 109    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT \
 110    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT \
 111    || GET_MODE_CLASS (MODE) == MODE_VECTOR_BOOL \
 112    || GET_MODE_CLASS (MODE) == MODE_VECTOR_INT)
 113
 114 /* Nonzero if MODE is a floating-point mode.  */
 115 #define FLOAT_MODE_P(MODE)              \
 116   (GET_MODE_CLASS (MODE) == MODE_FLOAT  \
 117    || GET_MODE_CLASS (MODE) == MODE_DECIMAL_FLOAT \
 118    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT \
 119    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FLOAT)
 120
 121 /* Nonzero if MODE is a complex mode.  */
 122 #define COMPLEX_MODE_P(MODE)                    \
 123   (GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT    \
 124    || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)
 125
 126 /* Nonzero if MODE is a vector mode.  */
 127 #define VECTOR_MODE_P(MODE)                             \
 128   (GET_MODE_CLASS (MODE) == MODE_VECTOR_BOOL            \
 129    || GET_MODE_CLASS (MODE) == MODE_VECTOR_INT          \
 130    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FLOAT        \
 131    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FRACT        \
 132    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UFRACT       \
 133    || GET_MODE_CLASS (MODE) == MODE_VECTOR_ACCUM        \
 134    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UACCUM)
 135
 136 /* Nonzero if MODE is a scalar integral mode.  */
 137 #define SCALAR_INT_MODE_P(MODE)                 \
 138   (GET_MODE_CLASS (MODE) == MODE_INT            \
 139    || GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT)
 140
 141 /* Nonzero if MODE is a scalar floating point mode.  */
 142 #define SCALAR_FLOAT_MODE_P(MODE)               \
 143   (GET_MODE_CLASS (MODE) == MODE_FLOAT          \
 144    || GET_MODE_CLASS (MODE) == MODE_DECIMAL_FLOAT)
 145
 146 /* Nonzero if MODE is a decimal floating point mode.  */
 147 #define DECIMAL_FLOAT_MODE_P(MODE)              \
 148   (GET_MODE_CLASS (MODE) == MODE_DECIMAL_FLOAT)
 149
 150 /* Nonzero if MODE is a scalar fract mode.  */
 151 #define SCALAR_FRACT_MODE_P(MODE)       \
 152   (GET_MODE_CLASS (MODE) == MODE_FRACT)
 153
 154 /* Nonzero if MODE is a scalar ufract mode.  */
 155 #define SCALAR_UFRACT_MODE_P(MODE)      \
 156   (GET_MODE_CLASS (MODE) == MODE_UFRACT)
 157
 158 /* Nonzero if MODE is a scalar fract or ufract mode.  */
 159 #define ALL_SCALAR_FRACT_MODE_P(MODE)   \
 160   (SCALAR_FRACT_MODE_P (MODE) || SCALAR_UFRACT_MODE_P (MODE))
 161
 162 /* Nonzero if MODE is a scalar accum mode.  */
 163 #define SCALAR_ACCUM_MODE_P(MODE)       \
 164   (GET_MODE_CLASS (MODE) == MODE_ACCUM)
 165
 166 /* Nonzero if MODE is a scalar uaccum mode.  */
 167 #define SCALAR_UACCUM_MODE_P(MODE)      \
 168   (GET_MODE_CLASS (MODE) == MODE_UACCUM)
 169
 170 /* Nonzero if MODE is a scalar accum or uaccum mode.  */
 171 #define ALL_SCALAR_ACCUM_MODE_P(MODE)   \
 172   (SCALAR_ACCUM_MODE_P (MODE) || SCALAR_UACCUM_MODE_P (MODE))
 173
 174 /* Nonzero if MODE is a scalar fract or accum mode.  */
 175 #define SIGNED_SCALAR_FIXED_POINT_MODE_P(MODE)  \
 176   (SCALAR_FRACT_MODE_P (MODE) || SCALAR_ACCUM_MODE_P (MODE))
 177
 178 /* Nonzero if MODE is a scalar ufract or uaccum mode.  */
 179 #define UNSIGNED_SCALAR_FIXED_POINT_MODE_P(MODE)        \
 180   (SCALAR_UFRACT_MODE_P (MODE) || SCALAR_UACCUM_MODE_P (MODE))
 181
 182 /* Nonzero if MODE is a scalar fract, ufract, accum or uaccum mode.  */
 183 #define ALL_SCALAR_FIXED_POINT_MODE_P(MODE)     \
 184   (SIGNED_SCALAR_FIXED_POINT_MODE_P (MODE)      \
 185    || UNSIGNED_SCALAR_FIXED_POINT_MODE_P (MODE))
 186
 187 /* Nonzero if MODE is a scalar/vector fract mode.  */
 188 #define FRACT_MODE_P(MODE)              \
 189   (GET_MODE_CLASS (MODE) == MODE_FRACT  \
 190    || GET_MODE_CLASS (MODE) == MODE_VECTOR_FRACT)
 191
 192 /* Nonzero if MODE is a scalar/vector ufract mode.  */
 193 #define UFRACT_MODE_P(MODE)             \
 194   (GET_MODE_CLASS (MODE) == MODE_UFRACT \
 195    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UFRACT)
 196
 197 /* Nonzero if MODE is a scalar/vector fract or ufract mode.  */
 198 #define ALL_FRACT_MODE_P(MODE)          \
 199   (FRACT_MODE_P (MODE) || UFRACT_MODE_P (MODE))
 200
 201 /* Nonzero if MODE is a scalar/vector accum mode.  */
 202 #define ACCUM_MODE_P(MODE)              \
 203   (GET_MODE_CLASS (MODE) == MODE_ACCUM  \
 204    || GET_MODE_CLASS (MODE) == MODE_VECTOR_ACCUM)
 205
 206 /* Nonzero if MODE is a scalar/vector uaccum mode.  */
 207 #define UACCUM_MODE_P(MODE)             \
 208   (GET_MODE_CLASS (MODE) == MODE_UACCUM \
 209    || GET_MODE_CLASS (MODE) == MODE_VECTOR_UACCUM)
 210
 211 /* Nonzero if MODE is a scalar/vector accum or uaccum mode.  */
 212 #define ALL_ACCUM_MODE_P(MODE)          \
 213   (ACCUM_MODE_P (MODE) || UACCUM_MODE_P (MODE))
 214
 215 /* Nonzero if MODE is a scalar/vector fract or accum mode.  */
 216 #define SIGNED_FIXED_POINT_MODE_P(MODE)         \
 217   (FRACT_MODE_P (MODE) || ACCUM_MODE_P (MODE))
 218
 219 /* Nonzero if MODE is a scalar/vector ufract or uaccum mode.  */
 220 #define UNSIGNED_FIXED_POINT_MODE_P(MODE)       \
 221   (UFRACT_MODE_P (MODE) || UACCUM_MODE_P (MODE))
 222
 223 /* Nonzero if MODE is a scalar/vector fract, ufract, accum or uaccum mode.  */
 224 #define ALL_FIXED_POINT_MODE_P(MODE)            \
 225   (SIGNED_FIXED_POINT_MODE_P (MODE)             \
 226    || UNSIGNED_FIXED_POINT_MODE_P (MODE))
 227
 228 /* Nonzero if MODE is opaque.  */
 229 #define OPAQUE_MODE_P(MODE)                     \
 230     (GET_MODE_CLASS (MODE) == MODE_OPAQUE)
 231
 232 /* Nonzero if CLASS modes can be widened.  */
 233 #define CLASS_HAS_WIDER_MODES_P(CLASS)         \
 234   (CLASS == MODE_INT                           \
 235    || CLASS == MODE_PARTIAL_INT                \
 236    || CLASS == MODE_FLOAT                      \
 237    || CLASS == MODE_DECIMAL_FLOAT              \
 238    || CLASS == MODE_COMPLEX_FLOAT              \
 239    || CLASS == MODE_FRACT                      \
 240    || CLASS == MODE_UFRACT                     \
 241    || CLASS == MODE_ACCUM                      \
 242    || CLASS == MODE_UACCUM)
 243
 244 /* An optional T (i.e. a T or nothing), where T is some form of mode class.  */
 245 template<typename T>
 246 class opt_mode
 247 {
 248 public:
 249   enum from_int { dummy = MAX_MACHINE_MODE };
 250
 251   ALWAYS_INLINE CONSTEXPR opt_mode () : m_mode (E_VOIDmode) {}
 252   ALWAYS_INLINE CONSTEXPR opt_mode (const T &m) : m_mode (m) {}
 253   template<typename U>
 254   ALWAYS_INLINE CONSTEXPR opt_mode (const U &m) : m_mode (T (m)) {}
 255   ALWAYS_INLINE CONSTEXPR opt_mode (from_int m) : m_mode (machine_mode (m)) {}
 256
 257   machine_mode else_void () const;
 258   machine_mode else_blk () const { return else_mode (BLKmode); }
 259   machine_mode else_mode (machine_mode) const;
 260   T require () const;
 261
 262   bool exists () const;
 263   template<typename U> bool exists (U *) const;
 264
 265   bool operator== (const T &m) const { return m_mode == m; }
 266   bool operator!= (const T &m) const { return m_mode != m; }
 267
 268 private:
 269   machine_mode m_mode;
 270 };
 271
 272 /* If the object contains a T, return its enum value, otherwise return
 273    E_VOIDmode.  */
 274
 275 template<typename T>
 276 ALWAYS_INLINE machine_mode
 277 opt_mode<T>::else_void () const
 278 {
 279   return m_mode;
 280 }
 281
 282 /* If the T exists, return its enum value, otherwise return FALLBACK.  */
 283
 284 template<typename T>
 285 inline machine_mode
 286 opt_mode<T>::else_mode (machine_mode fallback) const
 287 {
 288   return m_mode == E_VOIDmode ? fallback : m_mode;
 289 }
 290
 291 /* Assert that the object contains a T and return it.  */
 292
 293 template<typename T>
 294 inline T
 295 opt_mode<T>::require () const
 296 {
 297   gcc_checking_assert (m_mode != E_VOIDmode);
 298   return typename mode_traits<T>::from_int (m_mode);
 299 }
 300
 301 /* Return true if the object contains a T rather than nothing.  */
 302
 303 template<typename T>
 304 ALWAYS_INLINE bool
 305 opt_mode<T>::exists () const
 306 {
 307   return m_mode != E_VOIDmode;
 308 }
 309
 310 /* Return true if the object contains a T, storing it in *MODE if so.  */
 311
 312 template<typename T>
 313 template<typename U>
 314 inline bool
 315 opt_mode<T>::exists (U *mode) const
 316 {
 317   if (m_mode != E_VOIDmode)
 318     {
 319       *mode = T (typename mode_traits<T>::from_int (m_mode));
 320       return true;
 321     }
 322   return false;
 323 }
 324
 325 /* A POD version of mode class T.  */
 326
 327 template<typename T>
 328 struct pod_mode
 329 {
 330   typedef typename mode_traits<T>::from_int from_int;
 331   typedef typename T::measurement_type measurement_type;
 332
 333   machine_mode m_mode;
 334   ALWAYS_INLINE CONSTEXPR
 335   operator machine_mode () const { return m_mode; }
 336
 337   ALWAYS_INLINE CONSTEXPR
 338   operator T () const { return from_int (m_mode); }
 339
 340   ALWAYS_INLINE pod_mode &operator = (const T &m) { m_mode = m; return *this; }
 341 };
 342
 343 /* Return true if mode M has type T.  */
 344
 345 template<typename T>
 346 inline bool
 347 is_a (machine_mode m)
 348 {
 349   return T::includes_p (m);
 350 }
 351
 352 template<typename T, typename U>
 353 inline bool
 354 is_a (const opt_mode<U> &m)
 355 {
 356   return T::includes_p (m.else_void ());
 357 }
 358
 359 /* Assert that mode M has type T, and return it in that form.  */
 360
 361 template<typename T>
 362 inline T
 363 as_a (machine_mode m)
 364 {
 365   gcc_checking_assert (T::includes_p (m));
 366   return typename mode_traits<T>::from_int (m);
 367 }
 368
 369 template<typename T, typename U>
 370 inline T
 371 as_a (const opt_mode<U> &m)
 372 {
 373   return as_a <T> (m.else_void ());
 374 }
 375
 376 /* Convert M to an opt_mode<T>.  */
 377
 378 template<typename T>
 379 inline opt_mode<T>
 380 dyn_cast (machine_mode m)
 381 {
 382   if (T::includes_p (m))
 383     return T (typename mode_traits<T>::from_int (m));
 384   return opt_mode<T> ();
 385 }
 386
 387 template<typename T, typename U>
 388 inline opt_mode<T>
 389 dyn_cast (const opt_mode<U> &m)
 390 {
 391   return dyn_cast <T> (m.else_void ());
 392 }
 393
 394 /* Return true if mode M has type T, storing it as a T in *RESULT
 395    if so.  */
 396
 397 template<typename T, typename U>
 398 inline bool
 399 is_a (machine_mode m, U *result)
 400 {
 401   if (T::includes_p (m))
 402     {
 403       *result = T (typename mode_traits<T>::from_int (m));
 404       return true;
 405     }
 406   return false;
 407 }
 408
 409 /* Represents a machine mode that is known to be a SCALAR_INT_MODE_P.  */
 410 class scalar_int_mode
 411 {
 412 public:
 413   typedef mode_traits<scalar_int_mode>::from_int from_int;
 414   typedef unsigned short measurement_type;
 415
 416   ALWAYS_INLINE scalar_int_mode () {}
 417
 418   ALWAYS_INLINE CONSTEXPR
 419   scalar_int_mode (from_int m) : m_mode (machine_mode (m)) {}
 420
 421   ALWAYS_INLINE CONSTEXPR operator machine_mode () const { return m_mode; }
 422
 423   static bool includes_p (machine_mode);
 424
 425 protected:
 426   machine_mode m_mode;
 427 };
 428
 429 /* Return true if M is a scalar_int_mode.  */
 430
 431 inline bool
 432 scalar_int_mode::includes_p (machine_mode m)
 433 {
 434   return SCALAR_INT_MODE_P (m);
 435 }
 436
 437 /* Represents a machine mode that is known to be a SCALAR_FLOAT_MODE_P.  */
 438 class scalar_float_mode
 439 {
 440 public:
 441   typedef mode_traits<scalar_float_mode>::from_int from_int;
 442   typedef unsigned short measurement_type;
 443
 444   ALWAYS_INLINE scalar_float_mode () {}
 445
 446   ALWAYS_INLINE CONSTEXPR
 447   scalar_float_mode (from_int m) : m_mode (machine_mode (m)) {}
 448
 449   ALWAYS_INLINE CONSTEXPR operator machine_mode () const { return m_mode; }
 450
 451   static bool includes_p (machine_mode);
 452
 453 protected:
 454   machine_mode m_mode;
 455 };
 456
 457 /* Return true if M is a scalar_float_mode.  */
 458
 459 inline bool
 460 scalar_float_mode::includes_p (machine_mode m)
 461 {
 462   return SCALAR_FLOAT_MODE_P (m);
 463 }
 464
 465 /* Represents a machine mode that is known to be scalar.  */
 466 class scalar_mode
 467 {
 468 public:
 469   typedef mode_traits<scalar_mode>::from_int from_int;
 470   typedef unsigned short measurement_type;
 471
 472   ALWAYS_INLINE scalar_mode () {}
 473
 474   ALWAYS_INLINE CONSTEXPR
 475   scalar_mode (from_int m) : m_mode (machine_mode (m)) {}
 476
 477   ALWAYS_INLINE CONSTEXPR
 478   scalar_mode (const scalar_int_mode &m) : m_mode (m) {}
 479
 480   ALWAYS_INLINE CONSTEXPR
 481   scalar_mode (const scalar_float_mode &m) : m_mode (m) {}
 482
 483   ALWAYS_INLINE CONSTEXPR
 484   scalar_mode (const scalar_int_mode_pod &m) : m_mode (m) {}
 485
 486   ALWAYS_INLINE CONSTEXPR operator machine_mode () const { return m_mode; }
 487
 488   static bool includes_p (machine_mode);
 489
 490 protected:
 491   machine_mode m_mode;
 492 };
 493
 494 /* Return true if M represents some kind of scalar value.  */
 495
 496 inline bool
 497 scalar_mode::includes_p (machine_mode m)
 498 {
 499   switch (GET_MODE_CLASS (m))
 500     {
 501     case MODE_INT:
 502     case MODE_PARTIAL_INT:
 503     case MODE_FRACT:
 504     case MODE_UFRACT:
 505     case MODE_ACCUM:
 506     case MODE_UACCUM:
 507     case MODE_FLOAT:
 508     case MODE_DECIMAL_FLOAT:
 509       return true;
 510     default:
 511       return false;
 512     }
 513 }
 514
 515 /* Represents a machine mode that is known to be a COMPLEX_MODE_P.  */
 516 class complex_mode
 517 {
 518 public:
 519   typedef mode_traits<complex_mode>::from_int from_int;
 520   typedef unsigned short measurement_type;
 521
 522   ALWAYS_INLINE complex_mode () {}
 523
 524   ALWAYS_INLINE CONSTEXPR
 525   complex_mode (from_int m) : m_mode (machine_mode (m)) {}
 526
 527   ALWAYS_INLINE CONSTEXPR operator machine_mode () const { return m_mode; }
 528
 529   static bool includes_p (machine_mode);
 530
 531 protected:
 532   machine_mode m_mode;
 533 };
 534
 535 /* Return true if M is a complex_mode.  */
 536
 537 inline bool
 538 complex_mode::includes_p (machine_mode m)
 539 {
 540   return COMPLEX_MODE_P (m);
 541 }
 542
 543 /* Return the base GET_MODE_SIZE value for MODE.  */
 544
 545 ALWAYS_INLINE poly_uint16
 546 mode_to_bytes (machine_mode mode)
 547 {
 548 #if GCC_VERSION >= 4001
 549   return (__builtin_constant_p (mode)
 550           ? mode_size_inline (mode) : mode_size[mode]);
 551 #else
 552   return mode_size[mode];
 553 #endif
 554 }
 555
 556 /* Return the base GET_MODE_BITSIZE value for MODE.  */
 557
 558 ALWAYS_INLINE poly_uint16
 559 mode_to_bits (machine_mode mode)
 560 {
 561   return mode_to_bytes (mode) * BITS_PER_UNIT;
 562 }
 563
 564 /* Return the base GET_MODE_PRECISION value for MODE.  */
 565
 566 ALWAYS_INLINE poly_uint16
 567 mode_to_precision (machine_mode mode)
 568 {
 569   return mode_precision[mode];
 570 }
 571
 572 /* Return the base GET_MODE_INNER value for MODE.  */
 573
 574 ALWAYS_INLINE scalar_mode
 575 mode_to_inner (machine_mode mode)
 576 {
 577 #if GCC_VERSION >= 4001
 578   return scalar_mode::from_int (__builtin_constant_p (mode)
 579                                 ? mode_inner_inline (mode)
 580                                 : mode_inner[mode]);
 581 #else
 582   return scalar_mode::from_int (mode_inner[mode]);
 583 #endif
 584 }
 585
 586 /* Return the base GET_MODE_UNIT_SIZE value for MODE.  */
 587
 588 ALWAYS_INLINE unsigned char
 589 mode_to_unit_size (machine_mode mode)
 590 {
 591 #if GCC_VERSION >= 4001
 592   return (__builtin_constant_p (mode)
 593           ? mode_unit_size_inline (mode) : mode_unit_size[mode]);
 594 #else
 595   return mode_unit_size[mode];
 596 #endif
 597 }
 598
 599 /* Return the base GET_MODE_UNIT_PRECISION value for MODE.  */
 600
 601 ALWAYS_INLINE unsigned short
 602 mode_to_unit_precision (machine_mode mode)
 603 {
 604 #if GCC_VERSION >= 4001
 605   return (__builtin_constant_p (mode)
 606           ? mode_unit_precision_inline (mode) : mode_unit_precision[mode]);
 607 #else
 608   return mode_unit_precision[mode];
 609 #endif
 610 }
 611
 612 /* Return the base GET_MODE_NUNITS value for MODE.  */
 613
 614 ALWAYS_INLINE poly_uint16
 615 mode_to_nunits (machine_mode mode)
 616 {
 617 #if GCC_VERSION >= 4001
 618   return (__builtin_constant_p (mode)
 619           ? mode_nunits_inline (mode) : mode_nunits[mode]);
 620 #else
 621   return mode_nunits[mode];
 622 #endif
 623 }
 624
 625 /* Get the size in bytes of an object of mode MODE.  */
 626
 627 #if ONLY_FIXED_SIZE_MODES
 628 #define GET_MODE_SIZE(MODE) ((unsigned short) mode_to_bytes (MODE).coeffs[0])
 629 #else
 630 ALWAYS_INLINE poly_uint16
 631 GET_MODE_SIZE (machine_mode mode)
 632 {
 633   return mode_to_bytes (mode);
 634 }
 635
 636 template<typename T>
 637 ALWAYS_INLINE typename if_poly<typename T::measurement_type>::type
 638 GET_MODE_SIZE (const T &mode)
 639 {
 640   return mode_to_bytes (mode);
 641 }
 642
 643 template<typename T>
 644 ALWAYS_INLINE typename if_nonpoly<typename T::measurement_type>::type
 645 GET_MODE_SIZE (const T &mode)
 646 {
 647   return mode_to_bytes (mode).coeffs[0];
 648 }
 649 #endif
 650
 651 /* Get the size in bits of an object of mode MODE.  */
 652
 653 #if ONLY_FIXED_SIZE_MODES
 654 #define GET_MODE_BITSIZE(MODE) ((unsigned short) mode_to_bits (MODE).coeffs[0])
 655 #else
 656 ALWAYS_INLINE poly_uint16
 657 GET_MODE_BITSIZE (machine_mode mode)
 658 {
 659   return mode_to_bits (mode);
 660 }
 661
 662 template<typename T>
 663 ALWAYS_INLINE typename if_poly<typename T::measurement_type>::type
 664 GET_MODE_BITSIZE (const T &mode)
 665 {
 666   return mode_to_bits (mode);
 667 }
 668
 669 template<typename T>
 670 ALWAYS_INLINE typename if_nonpoly<typename T::measurement_type>::type
 671 GET_MODE_BITSIZE (const T &mode)
 672 {
 673   return mode_to_bits (mode).coeffs[0];
 674 }
 675 #endif
 676
 677 /* Get the number of value bits of an object of mode MODE.  */
 678
 679 #if ONLY_FIXED_SIZE_MODES
 680 #define GET_MODE_PRECISION(MODE) \
 681   ((unsigned short) mode_to_precision (MODE).coeffs[0])
 682 #else
 683 ALWAYS_INLINE poly_uint16
 684 GET_MODE_PRECISION (machine_mode mode)
 685 {
 686   return mode_to_precision (mode);
 687 }
 688
 689 template<typename T>
 690 ALWAYS_INLINE typename if_poly<typename T::measurement_type>::type
 691 GET_MODE_PRECISION (const T &mode)
 692 {
 693   return mode_to_precision (mode);
 694 }
 695
 696 template<typename T>
 697 ALWAYS_INLINE typename if_nonpoly<typename T::measurement_type>::type
 698 GET_MODE_PRECISION (const T &mode)
 699 {
 700   return mode_to_precision (mode).coeffs[0];
 701 }
 702 #endif
 703
 704 /* Get the number of integral bits of an object of mode MODE.  */
 705 extern CONST_MODE_IBIT unsigned char mode_ibit[NUM_MACHINE_MODES];
 706 #define GET_MODE_IBIT(MODE) mode_ibit[MODE]
 707
 708 /* Get the number of fractional bits of an object of mode MODE.  */
 709 extern CONST_MODE_FBIT unsigned char mode_fbit[NUM_MACHINE_MODES];
 710 #define GET_MODE_FBIT(MODE) mode_fbit[MODE]
 711
 712 /* Get a bitmask containing 1 for all bits in a word
 713    that fit within mode MODE.  */
 714
 715 extern CONST_MODE_MASK unsigned HOST_WIDE_INT
 716   mode_mask_array[NUM_MACHINE_MODES];
 717
 718 #define GET_MODE_MASK(MODE) mode_mask_array[MODE]
 719
 720 /* Return the mode of the basic parts of MODE.  For vector modes this is the
 721    mode of the vector elements.  For complex modes it is the mode of the real
 722    and imaginary parts.  For other modes it is MODE itself.  */
 723
 724 #define GET_MODE_INNER(MODE) (mode_to_inner (MODE))
 725
 726 /* Get the size in bytes or bits of the basic parts of an
 727    object of mode MODE.  */
 728
 729 #define GET_MODE_UNIT_SIZE(MODE) mode_to_unit_size (MODE)
 730
 731 #define GET_MODE_UNIT_BITSIZE(MODE) \
 732   ((unsigned short) (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT))
 733
 734 #define GET_MODE_UNIT_PRECISION(MODE) (mode_to_unit_precision (MODE))
 735
 736 /* Get the number of units in an object of mode MODE.  This is 2 for
 737    complex modes and the number of elements for vector modes.  */
 738
 739 #if ONLY_FIXED_SIZE_MODES
 740 #define GET_MODE_NUNITS(MODE) (mode_to_nunits (MODE).coeffs[0])
 741 #else
 742 ALWAYS_INLINE poly_uint16
 743 GET_MODE_NUNITS (machine_mode mode)
 744 {
 745   return mode_to_nunits (mode);
 746 }
 747
 748 template<typename T>
 749 ALWAYS_INLINE typename if_poly<typename T::measurement_type>::type
 750 GET_MODE_NUNITS (const T &mode)
 751 {
 752   return mode_to_nunits (mode);
 753 }
 754
 755 template<typename T>
 756 ALWAYS_INLINE typename if_nonpoly<typename T::measurement_type>::type
 757 GET_MODE_NUNITS (const T &mode)
 758 {
 759   return mode_to_nunits (mode).coeffs[0];
 760 }
 761 #endif
 762
 763 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 764
 765 template<typename T>
 766 ALWAYS_INLINE opt_mode<T>
 767 GET_MODE_WIDER_MODE (const T &m)
 768 {
 769   return typename opt_mode<T>::from_int (mode_wider[m]);
 770 }
 771
 772 /* For scalars, this is a mode with twice the precision.  For vectors,
 773    this is a mode with the same inner mode but with twice the elements.  */
 774
 775 template<typename T>
 776 ALWAYS_INLINE opt_mode<T>
 777 GET_MODE_2XWIDER_MODE (const T &m)
 778 {
 779   return typename opt_mode<T>::from_int (mode_2xwider[m]);
 780 }
 781
 782 /* Get the complex mode from the component mode.  */
 783 extern const unsigned char mode_complex[NUM_MACHINE_MODES];
 784 #define GET_MODE_COMPLEX_MODE(MODE) ((machine_mode) mode_complex[MODE])
 785
 786 /* Represents a machine mode that must have a fixed size.  The main
 787    use of this class is to represent the modes of objects that always
 788    have static storage duration, such as constant pool entries.
 789    (No current target supports the concept of variable-size static data.)  */
 790 class fixed_size_mode
 791 {
 792 public:
 793   typedef mode_traits<fixed_size_mode>::from_int from_int;
 794   typedef unsigned short measurement_type;
 795
 796   ALWAYS_INLINE fixed_size_mode () {}
 797
 798   ALWAYS_INLINE CONSTEXPR
 799   fixed_size_mode (from_int m) : m_mode (machine_mode (m)) {}
 800
 801   ALWAYS_INLINE CONSTEXPR
 802   fixed_size_mode (const scalar_mode &m) : m_mode (m) {}
 803
 804   ALWAYS_INLINE CONSTEXPR
 805   fixed_size_mode (const scalar_int_mode &m) : m_mode (m) {}
 806
 807   ALWAYS_INLINE CONSTEXPR
 808   fixed_size_mode (const scalar_float_mode &m) : m_mode (m) {}
 809
 810   ALWAYS_INLINE CONSTEXPR
 811   fixed_size_mode (const scalar_mode_pod &m) : m_mode (m) {}
 812
 813   ALWAYS_INLINE CONSTEXPR
 814   fixed_size_mode (const scalar_int_mode_pod &m) : m_mode (m) {}
 815
 816   ALWAYS_INLINE CONSTEXPR
 817   fixed_size_mode (const complex_mode &m) : m_mode (m) {}
 818
 819   ALWAYS_INLINE CONSTEXPR operator machine_mode () const { return m_mode; }
 820
 821   static bool includes_p (machine_mode);
 822
 823 protected:
 824   machine_mode m_mode;
 825 };
 826
 827 /* Return true if MODE has a fixed size.  */
 828
 829 inline bool
 830 fixed_size_mode::includes_p (machine_mode mode)
 831 {
 832   return mode_to_bytes (mode).is_constant ();
 833 }
 834
 835 /* Wrapper for mode arguments to target macros, so that if a target
 836    doesn't need polynomial-sized modes, its header file can continue
 837    to treat everything as fixed_size_mode.  This should go away once
 838    macros are moved to target hooks.  It shouldn't be used in other
 839    contexts.  */
 840 #if NUM_POLY_INT_COEFFS == 1
 841 #define MACRO_MODE(MODE) (as_a <fixed_size_mode> (MODE))
 842 #else
 843 #define MACRO_MODE(MODE) (MODE)
 844 #endif
 845
 846 extern opt_machine_mode mode_for_size (poly_uint64, enum mode_class, int);
 847
 848 /* Return the machine mode to use for a MODE_INT of SIZE bits, if one
 849    exists.  If LIMIT is nonzero, modes wider than MAX_FIXED_MODE_SIZE
 850    will not be used.  */
 851
 852 inline opt_scalar_int_mode
 853 int_mode_for_size (poly_uint64 size, int limit)
 854 {
 855   return dyn_cast <scalar_int_mode> (mode_for_size (size, MODE_INT, limit));
 856 }
 857
 858 /* Return the machine mode to use for a MODE_FLOAT of SIZE bits, if one
 859    exists.  */
 860
 861 inline opt_scalar_float_mode
 862 float_mode_for_size (poly_uint64 size)
 863 {
 864   return dyn_cast <scalar_float_mode> (mode_for_size (size, MODE_FLOAT, 0));
 865 }
 866
 867 /* Likewise for MODE_DECIMAL_FLOAT.  */
 868
 869 inline opt_scalar_float_mode
 870 decimal_float_mode_for_size (unsigned int size)
 871 {
 872   return dyn_cast <scalar_float_mode>
 873     (mode_for_size (size, MODE_DECIMAL_FLOAT, 0));
 874 }
 875
 876 extern machine_mode smallest_mode_for_size (poly_uint64, enum mode_class);
 877
 878 /* Find the narrowest integer mode that contains at least SIZE bits.
 879    Such a mode must exist.  */
 880
 881 inline scalar_int_mode
 882 smallest_int_mode_for_size (poly_uint64 size)
 883 {
 884   return as_a <scalar_int_mode> (smallest_mode_for_size (size, MODE_INT));
 885 }
 886
 887 extern opt_scalar_int_mode int_mode_for_mode (machine_mode);
 888 extern opt_machine_mode bitwise_mode_for_mode (machine_mode);
 889 extern opt_machine_mode mode_for_vector (scalar_mode, poly_uint64);
 890 extern opt_machine_mode related_vector_mode (machine_mode, scalar_mode,
 891                                              poly_uint64 = 0);
 892 extern opt_machine_mode related_int_vector_mode (machine_mode);
 893
 894 /* A class for iterating through possible bitfield modes.  */
 895 class bit_field_mode_iterator
 896 {
 897 public:
 898   bit_field_mode_iterator (HOST_WIDE_INT, HOST_WIDE_INT,
 899                            poly_int64, poly_int64,
 900                            unsigned int, bool);
 901   bool next_mode (scalar_int_mode *);
 902   bool prefer_smaller_modes ();
 903
 904 private:
 905   opt_scalar_int_mode m_mode;
 906   /* We use signed values here because the bit position can be negative
 907      for invalid input such as gcc.dg/pr48335-8.c.  */
 908   HOST_WIDE_INT m_bitsize;
 909   HOST_WIDE_INT m_bitpos;
 910   poly_int64 m_bitregion_start;
 911   poly_int64 m_bitregion_end;
 912   unsigned int m_align;
 913   bool m_volatilep;
 914   int m_count;
 915 };
 916
 917 /* Find the best mode to use to access a bit field.  */
 918
 919 extern bool get_best_mode (int, int, poly_uint64, poly_uint64, unsigned int,
 920                            unsigned HOST_WIDE_INT, bool, scalar_int_mode *);
 921
 922 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 923
 924 extern CONST_MODE_BASE_ALIGN unsigned short mode_base_align[NUM_MACHINE_MODES];
 925
 926 extern unsigned get_mode_alignment (machine_mode);
 927
 928 #define GET_MODE_ALIGNMENT(MODE) get_mode_alignment (MODE)
 929
 930 /* For each class, get the narrowest mode in that class.  */
 931
 932 extern const unsigned char class_narrowest_mode[MAX_MODE_CLASS];
 933 #define GET_CLASS_NARROWEST_MODE(CLASS) \
 934   ((machine_mode) class_narrowest_mode[CLASS])
 935
 936 /* The narrowest full integer mode available on the target.  */
 937
 938 #define NARROWEST_INT_MODE \
 939   (scalar_int_mode \
 940    (scalar_int_mode::from_int (class_narrowest_mode[MODE_INT])))
 941
 942 /* Return the narrowest mode in T's class.  */
 943
 944 template<typename T>
 945 inline T
 946 get_narrowest_mode (T mode)
 947 {
 948   return typename mode_traits<T>::from_int
 949     (class_narrowest_mode[GET_MODE_CLASS (mode)]);
 950 }
 951
 952 /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
 953    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
 954
 955 extern scalar_int_mode byte_mode;
 956 extern scalar_int_mode word_mode;
 957 extern scalar_int_mode ptr_mode;
 958
 959 /* Target-dependent machine mode initialization - in insn-modes.c.  */
 960 extern void init_adjust_machine_modes (void);
 961
 962 #define TRULY_NOOP_TRUNCATION_MODES_P(MODE1, MODE2) \
 963   (targetm.truly_noop_truncation (GET_MODE_PRECISION (MODE1), \
 964                                   GET_MODE_PRECISION (MODE2)))
 965
 966 /* Return true if MODE is a scalar integer mode that fits in a
 967    HOST_WIDE_INT.  */
 968
 969 inline bool
 970 HWI_COMPUTABLE_MODE_P (machine_mode mode)
 971 {
 972   machine_mode mme = mode;
 973   return (SCALAR_INT_MODE_P (mme)
 974           && mode_to_precision (mme).coeffs[0] <= HOST_BITS_PER_WIDE_INT);
 975 }
 976
 977 inline bool
 978 HWI_COMPUTABLE_MODE_P (scalar_int_mode mode)
 979 {
 980   return GET_MODE_PRECISION (mode) <= HOST_BITS_PER_WIDE_INT;
 981 }
 982
 983 struct int_n_data_t {
 984   /* These parts are initailized by genmodes output */
 985   unsigned int bitsize;
 986   scalar_int_mode_pod m;
 987   /* RID_* is RID_INTN_BASE + index into this array */
 988 };
 989
 990 /* This is also in tree.h.  genmodes.c guarantees the're sorted from
 991    smallest bitsize to largest bitsize. */
 992 extern bool int_n_enabled_p[NUM_INT_N_ENTS];
 993 extern const int_n_data_t int_n_data[NUM_INT_N_ENTS];
 994
 995 /* Return true if MODE has class MODE_INT, storing it as a scalar_int_mode
 996    in *INT_MODE if so.  */
 997
 998 template<typename T>
 999 inline bool
1000 is_int_mode (machine_mode mode, T *int_mode)
1001 {
1002   if (GET_MODE_CLASS (mode) == MODE_INT)
1003     {
1004       *int_mode = scalar_int_mode (scalar_int_mode::from_int (mode));
1005       return true;
1006     }
1007   return false;
1008 }
1009
1010 /* Return true if MODE has class MODE_FLOAT, storing it as a
1011    scalar_float_mode in *FLOAT_MODE if so.  */
1012
1013 template<typename T>
1014 inline bool
1015 is_float_mode (machine_mode mode, T *float_mode)
1016 {
1017   if (GET_MODE_CLASS (mode) == MODE_FLOAT)
1018     {
1019       *float_mode = scalar_float_mode (scalar_float_mode::from_int (mode));
1020       return true;
1021     }
1022   return false;
1023 }
1024
1025 /* Return true if MODE has class MODE_COMPLEX_INT, storing it as
1026    a complex_mode in *CMODE if so.  */
1027
1028 template<typename T>
1029 inline bool
1030 is_complex_int_mode (machine_mode mode, T *cmode)
1031 {
1032   if (GET_MODE_CLASS (mode) == MODE_COMPLEX_INT)
1033     {
1034       *cmode = complex_mode (complex_mode::from_int (mode));
1035       return true;
1036     }
1037   return false;
1038 }
1039
1040 /* Return true if MODE has class MODE_COMPLEX_FLOAT, storing it as
1041    a complex_mode in *CMODE if so.  */
1042
1043 template<typename T>
1044 inline bool
1045 is_complex_float_mode (machine_mode mode, T *cmode)
1046 {
1047   if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT)
1048     {
1049       *cmode = complex_mode (complex_mode::from_int (mode));
1050       return true;
1051     }
1052   return false;
1053 }
1054
1055 /* Return true if MODE is a scalar integer mode with a precision
1056    smaller than LIMIT's precision.  */
1057
1058 inline bool
1059 is_narrower_int_mode (machine_mode mode, scalar_int_mode limit)
1060 {
1061   scalar_int_mode int_mode;
1062   return (is_a <scalar_int_mode> (mode, &int_mode)
1063           && GET_MODE_PRECISION (int_mode) < GET_MODE_PRECISION (limit));
1064 }
1065
1066 namespace mode_iterator
1067 {
1068   /* Start mode iterator *ITER at the first mode in class MCLASS, if any.  */
1069
1070   template<typename T>
1071   inline void
1072   start (opt_mode<T> *iter, enum mode_class mclass)
1073   {
1074     if (GET_CLASS_NARROWEST_MODE (mclass) == E_VOIDmode)
1075       *iter = opt_mode<T> ();
1076     else
1077       *iter = as_a<T> (GET_CLASS_NARROWEST_MODE (mclass));
1078   }
1079
1080   inline void
1081   start (machine_mode *iter, enum mode_class mclass)
1082   {
1083     *iter = GET_CLASS_NARROWEST_MODE (mclass);
1084   }
1085
1086   /* Return true if mode iterator *ITER has not reached the end.  */
1087
1088   template<typename T>
1089   inline bool
1090   iterate_p (opt_mode<T> *iter)
1091   {
1092     return iter->exists ();
1093   }
1094
1095   inline bool
1096   iterate_p (machine_mode *iter)
1097   {
1098     return *iter != E_VOIDmode;
1099   }
1100
1101   /* Set mode iterator *ITER to the next widest mode in the same class,
1102      if any.  */
1103
1104   template<typename T>
1105   inline void
1106   get_wider (opt_mode<T> *iter)
1107   {
1108     *iter = GET_MODE_WIDER_MODE (iter->require ());
1109   }
1110
1111   inline void
1112   get_wider (machine_mode *iter)
1113   {
1114     *iter = GET_MODE_WIDER_MODE (*iter).else_void ();
1115   }
1116
1117   /* Set mode iterator *ITER to the next widest mode in the same class.
1118      Such a mode is known to exist.  */
1119
1120   template<typename T>
1121   inline void
1122   get_known_wider (T *iter)
1123   {
1124     *iter = GET_MODE_WIDER_MODE (*iter).require ();
1125   }
1126
1127   /* Set mode iterator *ITER to the mode that is two times wider than the
1128      current one, if such a mode exists.  */
1129
1130   template<typename T>
1131   inline void
1132   get_2xwider (opt_mode<T> *iter)
1133   {
1134     *iter = GET_MODE_2XWIDER_MODE (iter->require ());
1135   }
1136
1137   inline void
1138   get_2xwider (machine_mode *iter)
1139   {
1140     *iter = GET_MODE_2XWIDER_MODE (*iter).else_void ();
1141   }
1142 }
1143
1144 /* Make ITERATOR iterate over all the modes in mode class CLASS,
1145    from narrowest to widest.  */
1146 #define FOR_EACH_MODE_IN_CLASS(ITERATOR, CLASS)  \
1147   for (mode_iterator::start (&(ITERATOR), CLASS); \
1148        mode_iterator::iterate_p (&(ITERATOR)); \
1149        mode_iterator::get_wider (&(ITERATOR)))
1150
1151 /* Make ITERATOR iterate over all the modes in the range [START, END),
1152    in order of increasing width.  */
1153 #define FOR_EACH_MODE(ITERATOR, START, END) \
1154   for ((ITERATOR) = (START); \
1155        (ITERATOR) != (END); \
1156        mode_iterator::get_known_wider (&(ITERATOR)))
1157
1158 /* Make ITERATOR iterate over START and all wider modes in the same
1159    class, in order of increasing width.  */
1160 #define FOR_EACH_MODE_FROM(ITERATOR, START) \
1161   for ((ITERATOR) = (START); \
1162        mode_iterator::iterate_p (&(ITERATOR)); \
1163        mode_iterator::get_wider (&(ITERATOR)))
1164
1165 /* Make ITERATOR iterate over modes in the range [NARROWEST, END)
1166    in order of increasing width, where NARROWEST is the narrowest mode
1167    in END's class.  */
1168 #define FOR_EACH_MODE_UNTIL(ITERATOR, END) \
1169   FOR_EACH_MODE (ITERATOR, get_narrowest_mode (END), END)
1170
1171 /* Make ITERATOR iterate over modes in the same class as MODE, in order
1172    of increasing width.  Start at the first mode wider than START,
1173    or don't iterate at all if there is no wider mode.  */
1174 #define FOR_EACH_WIDER_MODE(ITERATOR, START) \
1175   for ((ITERATOR) = (START), mode_iterator::get_wider (&(ITERATOR)); \
1176        mode_iterator::iterate_p (&(ITERATOR)); \
1177        mode_iterator::get_wider (&(ITERATOR)))
1178
1179 /* Make ITERATOR iterate over modes in the same class as MODE, in order
1180    of increasing width, and with each mode being twice the width of the
1181    previous mode.  Start at the mode that is two times wider than START,
1182    or don't iterate at all if there is no such mode.  */
1183 #define FOR_EACH_2XWIDER_MODE(ITERATOR, START) \
1184   for ((ITERATOR) = (START), mode_iterator::get_2xwider (&(ITERATOR)); \
1185        mode_iterator::iterate_p (&(ITERATOR)); \
1186        mode_iterator::get_2xwider (&(ITERATOR)))
1187
1188 template<typename T>
1189 void
1190 gt_ggc_mx (pod_mode<T> *)
1191 {
1192 }
1193
1194 template<typename T>
1195 void
1196 gt_pch_nx (pod_mode<T> *)
1197 {
1198 }
1199
1200 template<typename T>
1201 void
1202 gt_pch_nx (pod_mode<T> *, gt_pointer_operator, void *)
1203 {
1204 }
1205
1206 #endif /* not HAVE_MACHINE_MODES */