gcc/machmode.h

   1 /* Machine mode definitions for GCC; included by rtl.h and tree.h.
   2    Copyright (C) 1991-2020 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 unsigned HOST_WIDE_INT mode_mask_array[NUM_MACHINE_MODES];
 716
 717 #define GET_MODE_MASK(MODE) mode_mask_array[MODE]
 718
 719 /* Return the mode of the basic parts of MODE.  For vector modes this is the
 720    mode of the vector elements.  For complex modes it is the mode of the real
 721    and imaginary parts.  For other modes it is MODE itself.  */
 722
 723 #define GET_MODE_INNER(MODE) (mode_to_inner (MODE))
 724
 725 /* Get the size in bytes or bits of the basic parts of an
 726    object of mode MODE.  */
 727
 728 #define GET_MODE_UNIT_SIZE(MODE) mode_to_unit_size (MODE)
 729
 730 #define GET_MODE_UNIT_BITSIZE(MODE) \
 731   ((unsigned short) (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT))
 732
 733 #define GET_MODE_UNIT_PRECISION(MODE) (mode_to_unit_precision (MODE))
 734
 735 /* Get the number of units in an object of mode MODE.  This is 2 for
 736    complex modes and the number of elements for vector modes.  */
 737
 738 #if ONLY_FIXED_SIZE_MODES
 739 #define GET_MODE_NUNITS(MODE) (mode_to_nunits (MODE).coeffs[0])
 740 #else
 741 ALWAYS_INLINE poly_uint16
 742 GET_MODE_NUNITS (machine_mode mode)
 743 {
 744   return mode_to_nunits (mode);
 745 }
 746
 747 template<typename T>
 748 ALWAYS_INLINE typename if_poly<typename T::measurement_type>::type
 749 GET_MODE_NUNITS (const T &mode)
 750 {
 751   return mode_to_nunits (mode);
 752 }
 753
 754 template<typename T>
 755 ALWAYS_INLINE typename if_nonpoly<typename T::measurement_type>::type
 756 GET_MODE_NUNITS (const T &mode)
 757 {
 758   return mode_to_nunits (mode).coeffs[0];
 759 }
 760 #endif
 761
 762 /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */
 763
 764 template<typename T>
 765 ALWAYS_INLINE opt_mode<T>
 766 GET_MODE_WIDER_MODE (const T &m)
 767 {
 768   return typename opt_mode<T>::from_int (mode_wider[m]);
 769 }
 770
 771 /* For scalars, this is a mode with twice the precision.  For vectors,
 772    this is a mode with the same inner mode but with twice the elements.  */
 773
 774 template<typename T>
 775 ALWAYS_INLINE opt_mode<T>
 776 GET_MODE_2XWIDER_MODE (const T &m)
 777 {
 778   return typename opt_mode<T>::from_int (mode_2xwider[m]);
 779 }
 780
 781 /* Get the complex mode from the component mode.  */
 782 extern const unsigned char mode_complex[NUM_MACHINE_MODES];
 783 #define GET_MODE_COMPLEX_MODE(MODE) ((machine_mode) mode_complex[MODE])
 784
 785 /* Represents a machine mode that must have a fixed size.  The main
 786    use of this class is to represent the modes of objects that always
 787    have static storage duration, such as constant pool entries.
 788    (No current target supports the concept of variable-size static data.)  */
 789 class fixed_size_mode
 790 {
 791 public:
 792   typedef mode_traits<fixed_size_mode>::from_int from_int;
 793   typedef unsigned short measurement_type;
 794
 795   ALWAYS_INLINE fixed_size_mode () {}
 796
 797   ALWAYS_INLINE CONSTEXPR
 798   fixed_size_mode (from_int m) : m_mode (machine_mode (m)) {}
 799
 800   ALWAYS_INLINE CONSTEXPR
 801   fixed_size_mode (const scalar_mode &m) : m_mode (m) {}
 802
 803   ALWAYS_INLINE CONSTEXPR
 804   fixed_size_mode (const scalar_int_mode &m) : m_mode (m) {}
 805
 806   ALWAYS_INLINE CONSTEXPR
 807   fixed_size_mode (const scalar_float_mode &m) : m_mode (m) {}
 808
 809   ALWAYS_INLINE CONSTEXPR
 810   fixed_size_mode (const scalar_mode_pod &m) : m_mode (m) {}
 811
 812   ALWAYS_INLINE CONSTEXPR
 813   fixed_size_mode (const scalar_int_mode_pod &m) : m_mode (m) {}
 814
 815   ALWAYS_INLINE CONSTEXPR
 816   fixed_size_mode (const complex_mode &m) : m_mode (m) {}
 817
 818   ALWAYS_INLINE CONSTEXPR operator machine_mode () const { return m_mode; }
 819
 820   static bool includes_p (machine_mode);
 821
 822 protected:
 823   machine_mode m_mode;
 824 };
 825
 826 /* Return true if MODE has a fixed size.  */
 827
 828 inline bool
 829 fixed_size_mode::includes_p (machine_mode mode)
 830 {
 831   return mode_to_bytes (mode).is_constant ();
 832 }
 833
 834 /* Wrapper for mode arguments to target macros, so that if a target
 835    doesn't need polynomial-sized modes, its header file can continue
 836    to treat everything as fixed_size_mode.  This should go away once
 837    macros are moved to target hooks.  It shouldn't be used in other
 838    contexts.  */
 839 #if NUM_POLY_INT_COEFFS == 1
 840 #define MACRO_MODE(MODE) (as_a <fixed_size_mode> (MODE))
 841 #else
 842 #define MACRO_MODE(MODE) (MODE)
 843 #endif
 844
 845 extern opt_machine_mode mode_for_size (poly_uint64, enum mode_class, int);
 846
 847 /* Return the machine mode to use for a MODE_INT of SIZE bits, if one
 848    exists.  If LIMIT is nonzero, modes wider than MAX_FIXED_MODE_SIZE
 849    will not be used.  */
 850
 851 inline opt_scalar_int_mode
 852 int_mode_for_size (poly_uint64 size, int limit)
 853 {
 854   return dyn_cast <scalar_int_mode> (mode_for_size (size, MODE_INT, limit));
 855 }
 856
 857 /* Return the machine mode to use for a MODE_FLOAT of SIZE bits, if one
 858    exists.  */
 859
 860 inline opt_scalar_float_mode
 861 float_mode_for_size (poly_uint64 size)
 862 {
 863   return dyn_cast <scalar_float_mode> (mode_for_size (size, MODE_FLOAT, 0));
 864 }
 865
 866 /* Likewise for MODE_DECIMAL_FLOAT.  */
 867
 868 inline opt_scalar_float_mode
 869 decimal_float_mode_for_size (unsigned int size)
 870 {
 871   return dyn_cast <scalar_float_mode>
 872     (mode_for_size (size, MODE_DECIMAL_FLOAT, 0));
 873 }
 874
 875 extern machine_mode smallest_mode_for_size (poly_uint64, enum mode_class);
 876
 877 /* Find the narrowest integer mode that contains at least SIZE bits.
 878    Such a mode must exist.  */
 879
 880 inline scalar_int_mode
 881 smallest_int_mode_for_size (poly_uint64 size)
 882 {
 883   return as_a <scalar_int_mode> (smallest_mode_for_size (size, MODE_INT));
 884 }
 885
 886 extern opt_scalar_int_mode int_mode_for_mode (machine_mode);
 887 extern opt_machine_mode bitwise_mode_for_mode (machine_mode);
 888 extern opt_machine_mode mode_for_vector (scalar_mode, poly_uint64);
 889 extern opt_machine_mode related_vector_mode (machine_mode, scalar_mode,
 890                                              poly_uint64 = 0);
 891 extern opt_machine_mode related_int_vector_mode (machine_mode);
 892
 893 /* A class for iterating through possible bitfield modes.  */
 894 class bit_field_mode_iterator
 895 {
 896 public:
 897   bit_field_mode_iterator (HOST_WIDE_INT, HOST_WIDE_INT,
 898                            poly_int64, poly_int64,
 899                            unsigned int, bool);
 900   bool next_mode (scalar_int_mode *);
 901   bool prefer_smaller_modes ();
 902
 903 private:
 904   opt_scalar_int_mode m_mode;
 905   /* We use signed values here because the bit position can be negative
 906      for invalid input such as gcc.dg/pr48335-8.c.  */
 907   HOST_WIDE_INT m_bitsize;
 908   HOST_WIDE_INT m_bitpos;
 909   poly_int64 m_bitregion_start;
 910   poly_int64 m_bitregion_end;
 911   unsigned int m_align;
 912   bool m_volatilep;
 913   int m_count;
 914 };
 915
 916 /* Find the best mode to use to access a bit field.  */
 917
 918 extern bool get_best_mode (int, int, poly_uint64, poly_uint64, unsigned int,
 919                            unsigned HOST_WIDE_INT, bool, scalar_int_mode *);
 920
 921 /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */
 922
 923 extern CONST_MODE_BASE_ALIGN unsigned short mode_base_align[NUM_MACHINE_MODES];
 924
 925 extern unsigned get_mode_alignment (machine_mode);
 926
 927 #define GET_MODE_ALIGNMENT(MODE) get_mode_alignment (MODE)
 928
 929 /* For each class, get the narrowest mode in that class.  */
 930
 931 extern const unsigned char class_narrowest_mode[MAX_MODE_CLASS];
 932 #define GET_CLASS_NARROWEST_MODE(CLASS) \
 933   ((machine_mode) class_narrowest_mode[CLASS])
 934
 935 /* The narrowest full integer mode available on the target.  */
 936
 937 #define NARROWEST_INT_MODE \
 938   (scalar_int_mode \
 939    (scalar_int_mode::from_int (class_narrowest_mode[MODE_INT])))
 940
 941 /* Return the narrowest mode in T's class.  */
 942
 943 template<typename T>
 944 inline T
 945 get_narrowest_mode (T mode)
 946 {
 947   return typename mode_traits<T>::from_int
 948     (class_narrowest_mode[GET_MODE_CLASS (mode)]);
 949 }
 950
 951 /* Define the integer modes whose sizes are BITS_PER_UNIT and BITS_PER_WORD
 952    and the mode whose class is Pmode and whose size is POINTER_SIZE.  */
 953
 954 extern scalar_int_mode byte_mode;
 955 extern scalar_int_mode word_mode;
 956 extern scalar_int_mode ptr_mode;
 957
 958 /* Target-dependent machine mode initialization - in insn-modes.c.  */
 959 extern void init_adjust_machine_modes (void);
 960
 961 #define TRULY_NOOP_TRUNCATION_MODES_P(MODE1, MODE2) \
 962   (targetm.truly_noop_truncation (GET_MODE_PRECISION (MODE1), \
 963                                   GET_MODE_PRECISION (MODE2)))
 964
 965 /* Return true if MODE is a scalar integer mode that fits in a
 966    HOST_WIDE_INT.  */
 967
 968 inline bool
 969 HWI_COMPUTABLE_MODE_P (machine_mode mode)
 970 {
 971   machine_mode mme = mode;
 972   return (SCALAR_INT_MODE_P (mme)
 973           && mode_to_precision (mme).coeffs[0] <= HOST_BITS_PER_WIDE_INT);
 974 }
 975
 976 inline bool
 977 HWI_COMPUTABLE_MODE_P (scalar_int_mode mode)
 978 {
 979   return GET_MODE_PRECISION (mode) <= HOST_BITS_PER_WIDE_INT;
 980 }
 981
 982 struct int_n_data_t {
 983   /* These parts are initailized by genmodes output */
 984   unsigned int bitsize;
 985   scalar_int_mode_pod m;
 986   /* RID_* is RID_INTN_BASE + index into this array */
 987 };
 988
 989 /* This is also in tree.h.  genmodes.c guarantees the're sorted from
 990    smallest bitsize to largest bitsize. */
 991 extern bool int_n_enabled_p[NUM_INT_N_ENTS];
 992 extern const int_n_data_t int_n_data[NUM_INT_N_ENTS];
 993
 994 /* Return true if MODE has class MODE_INT, storing it as a scalar_int_mode
 995    in *INT_MODE if so.  */
 996
 997 template<typename T>
 998 inline bool
 999 is_int_mode (machine_mode mode, T *int_mode)
1000 {
1001   if (GET_MODE_CLASS (mode) == MODE_INT)
1002     {
1003       *int_mode = scalar_int_mode (scalar_int_mode::from_int (mode));
1004       return true;
1005     }
1006   return false;
1007 }
1008
1009 /* Return true if MODE has class MODE_FLOAT, storing it as a
1010    scalar_float_mode in *FLOAT_MODE if so.  */
1011
1012 template<typename T>
1013 inline bool
1014 is_float_mode (machine_mode mode, T *float_mode)
1015 {
1016   if (GET_MODE_CLASS (mode) == MODE_FLOAT)
1017     {
1018       *float_mode = scalar_float_mode (scalar_float_mode::from_int (mode));
1019       return true;
1020     }
1021   return false;
1022 }
1023
1024 /* Return true if MODE has class MODE_COMPLEX_INT, storing it as
1025    a complex_mode in *CMODE if so.  */
1026
1027 template<typename T>
1028 inline bool
1029 is_complex_int_mode (machine_mode mode, T *cmode)
1030 {
1031   if (GET_MODE_CLASS (mode) == MODE_COMPLEX_INT)
1032     {
1033       *cmode = complex_mode (complex_mode::from_int (mode));
1034       return true;
1035     }
1036   return false;
1037 }
1038
1039 /* Return true if MODE has class MODE_COMPLEX_FLOAT, storing it as
1040    a complex_mode in *CMODE if so.  */
1041
1042 template<typename T>
1043 inline bool
1044 is_complex_float_mode (machine_mode mode, T *cmode)
1045 {
1046   if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT)
1047     {
1048       *cmode = complex_mode (complex_mode::from_int (mode));
1049       return true;
1050     }
1051   return false;
1052 }
1053
1054 /* Return true if MODE is a scalar integer mode with a precision
1055    smaller than LIMIT's precision.  */
1056
1057 inline bool
1058 is_narrower_int_mode (machine_mode mode, scalar_int_mode limit)
1059 {
1060   scalar_int_mode int_mode;
1061   return (is_a <scalar_int_mode> (mode, &int_mode)
1062           && GET_MODE_PRECISION (int_mode) < GET_MODE_PRECISION (limit));
1063 }
1064
1065 namespace mode_iterator
1066 {
1067   /* Start mode iterator *ITER at the first mode in class MCLASS, if any.  */
1068
1069   template<typename T>
1070   inline void
1071   start (opt_mode<T> *iter, enum mode_class mclass)
1072   {
1073     if (GET_CLASS_NARROWEST_MODE (mclass) == E_VOIDmode)
1074       *iter = opt_mode<T> ();
1075     else
1076       *iter = as_a<T> (GET_CLASS_NARROWEST_MODE (mclass));
1077   }
1078
1079   inline void
1080   start (machine_mode *iter, enum mode_class mclass)
1081   {
1082     *iter = GET_CLASS_NARROWEST_MODE (mclass);
1083   }
1084
1085   /* Return true if mode iterator *ITER has not reached the end.  */
1086
1087   template<typename T>
1088   inline bool
1089   iterate_p (opt_mode<T> *iter)
1090   {
1091     return iter->exists ();
1092   }
1093
1094   inline bool
1095   iterate_p (machine_mode *iter)
1096   {
1097     return *iter != E_VOIDmode;
1098   }
1099
1100   /* Set mode iterator *ITER to the next widest mode in the same class,
1101      if any.  */
1102
1103   template<typename T>
1104   inline void
1105   get_wider (opt_mode<T> *iter)
1106   {
1107     *iter = GET_MODE_WIDER_MODE (iter->require ());
1108   }
1109
1110   inline void
1111   get_wider (machine_mode *iter)
1112   {
1113     *iter = GET_MODE_WIDER_MODE (*iter).else_void ();
1114   }
1115
1116   /* Set mode iterator *ITER to the next widest mode in the same class.
1117      Such a mode is known to exist.  */
1118
1119   template<typename T>
1120   inline void
1121   get_known_wider (T *iter)
1122   {
1123     *iter = GET_MODE_WIDER_MODE (*iter).require ();
1124   }
1125
1126   /* Set mode iterator *ITER to the mode that is two times wider than the
1127      current one, if such a mode exists.  */
1128
1129   template<typename T>
1130   inline void
1131   get_2xwider (opt_mode<T> *iter)
1132   {
1133     *iter = GET_MODE_2XWIDER_MODE (iter->require ());
1134   }
1135
1136   inline void
1137   get_2xwider (machine_mode *iter)
1138   {
1139     *iter = GET_MODE_2XWIDER_MODE (*iter).else_void ();
1140   }
1141 }
1142
1143 /* Make ITERATOR iterate over all the modes in mode class CLASS,
1144    from narrowest to widest.  */
1145 #define FOR_EACH_MODE_IN_CLASS(ITERATOR, CLASS)  \
1146   for (mode_iterator::start (&(ITERATOR), CLASS); \
1147        mode_iterator::iterate_p (&(ITERATOR)); \
1148        mode_iterator::get_wider (&(ITERATOR)))
1149
1150 /* Make ITERATOR iterate over all the modes in the range [START, END),
1151    in order of increasing width.  */
1152 #define FOR_EACH_MODE(ITERATOR, START, END) \
1153   for ((ITERATOR) = (START); \
1154        (ITERATOR) != (END); \
1155        mode_iterator::get_known_wider (&(ITERATOR)))
1156
1157 /* Make ITERATOR iterate over START and all wider modes in the same
1158    class, in order of increasing width.  */
1159 #define FOR_EACH_MODE_FROM(ITERATOR, START) \
1160   for ((ITERATOR) = (START); \
1161        mode_iterator::iterate_p (&(ITERATOR)); \
1162        mode_iterator::get_wider (&(ITERATOR)))
1163
1164 /* Make ITERATOR iterate over modes in the range [NARROWEST, END)
1165    in order of increasing width, where NARROWEST is the narrowest mode
1166    in END's class.  */
1167 #define FOR_EACH_MODE_UNTIL(ITERATOR, END) \
1168   FOR_EACH_MODE (ITERATOR, get_narrowest_mode (END), END)
1169
1170 /* Make ITERATOR iterate over modes in the same class as MODE, in order
1171    of increasing width.  Start at the first mode wider than START,
1172    or don't iterate at all if there is no wider mode.  */
1173 #define FOR_EACH_WIDER_MODE(ITERATOR, START) \
1174   for ((ITERATOR) = (START), mode_iterator::get_wider (&(ITERATOR)); \
1175        mode_iterator::iterate_p (&(ITERATOR)); \
1176        mode_iterator::get_wider (&(ITERATOR)))
1177
1178 /* Make ITERATOR iterate over modes in the same class as MODE, in order
1179    of increasing width, and with each mode being twice the width of the
1180    previous mode.  Start at the mode that is two times wider than START,
1181    or don't iterate at all if there is no such mode.  */
1182 #define FOR_EACH_2XWIDER_MODE(ITERATOR, START) \
1183   for ((ITERATOR) = (START), mode_iterator::get_2xwider (&(ITERATOR)); \
1184        mode_iterator::iterate_p (&(ITERATOR)); \
1185        mode_iterator::get_2xwider (&(ITERATOR)))
1186
1187 template<typename T>
1188 void
1189 gt_ggc_mx (pod_mode<T> *)
1190 {
1191 }
1192
1193 template<typename T>
1194 void
1195 gt_pch_nx (pod_mode<T> *)
1196 {
1197 }
1198
1199 template<typename T>
1200 void
1201 gt_pch_nx (pod_mode<T> *, void (*) (void *, void *), void *)
1202 {
1203 }
1204
1205 #endif /* not HAVE_MACHINE_MODES */