gcc/targhooks.c

   1 /* Default target hook functions.
   2    Copyright (C) 2003-2018 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 /* The migration of target macros to target hooks works as follows:
  21
  22    1. Create a target hook that uses the existing target macros to
  23       implement the same functionality.
  24
  25    2. Convert all the MI files to use the hook instead of the macro.
  26
  27    3. Repeat for a majority of the remaining target macros.  This will
  28       take some time.
  29
  30    4. Tell target maintainers to start migrating.
  31
  32    5. Eventually convert the backends to override the hook instead of
  33       defining the macros.  This will take some time too.
  34
  35    6. TBD when, poison the macros.  Unmigrated targets will break at
  36       this point.
  37
  38    Note that we expect steps 1-3 to be done by the people that
  39    understand what the MI does with each macro, and step 5 to be done
  40    by the target maintainers for their respective targets.
  41
  42    Note that steps 1 and 2 don't have to be done together, but no
  43    target can override the new hook until step 2 is complete for it.
  44
  45    Once the macros are poisoned, we will revert to the old migration
  46    rules - migrate the macro, callers, and targets all at once.  This
  47    comment can thus be removed at that point.  */
  48
  49 #include "config.h"
  50 #include "system.h"
  51 #include "coretypes.h"
  52 #include "target.h"
  53 #include "function.h"
  54 #include "rtl.h"
  55 #include "tree.h"
  56 #include "tree-ssa-alias.h"
  57 #include "gimple-expr.h"
  58 #include "memmodel.h"
  59 #include "tm_p.h"
  60 #include "stringpool.h"
  61 #include "tree-vrp.h"
  62 #include "tree-ssanames.h"
  63 #include "profile-count.h"
  64 #include "optabs.h"
  65 #include "regs.h"
  66 #include "recog.h"
  67 #include "diagnostic-core.h"
  68 #include "fold-const.h"
  69 #include "stor-layout.h"
  70 #include "varasm.h"
  71 #include "flags.h"
  72 #include "explow.h"
  73 #include "calls.h"
  74 #include "expr.h"
  75 #include "output.h"
  76 #include "common/common-target.h"
  77 #include "reload.h"
  78 #include "intl.h"
  79 #include "opts.h"
  80 #include "gimplify.h"
  81 #include "predict.h"
  82 #include "params.h"
  83 #include "real.h"
  84 #include "langhooks.h"
  85 #include "sbitmap.h"
  86
  87 bool
  88 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED,
  89                               rtx addr ATTRIBUTE_UNUSED,
  90                               bool strict ATTRIBUTE_UNUSED)
  91 {
  92 #ifdef GO_IF_LEGITIMATE_ADDRESS
  93   /* Defer to the old implementation using a goto.  */
  94   if (strict)
  95     return strict_memory_address_p (mode, addr);
  96   else
  97     return memory_address_p (mode, addr);
  98 #else
  99   gcc_unreachable ();
 100 #endif
 101 }
 102
 103 void
 104 default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
 105 {
 106 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
 107   ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun);
 108 #endif
 109 }
 110
 111 int
 112 default_unspec_may_trap_p (const_rtx x, unsigned flags)
 113 {
 114   int i;
 115
 116   /* Any floating arithmetic may trap.  */
 117   if ((SCALAR_FLOAT_MODE_P (GET_MODE (x)) && flag_trapping_math))
 118     return 1;
 119
 120   for (i = 0; i < XVECLEN (x, 0); ++i)
 121     {
 122       if (may_trap_p_1 (XVECEXP (x, 0, i), flags))
 123         return 1;
 124     }
 125
 126   return 0;
 127 }
 128
 129 machine_mode
 130 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
 131                                machine_mode mode,
 132                                int *punsignedp ATTRIBUTE_UNUSED,
 133                                const_tree funtype ATTRIBUTE_UNUSED,
 134                                int for_return ATTRIBUTE_UNUSED)
 135 {
 136   if (type != NULL_TREE && for_return == 2)
 137     return promote_mode (type, mode, punsignedp);
 138   return mode;
 139 }
 140
 141 machine_mode
 142 default_promote_function_mode_always_promote (const_tree type,
 143                                               machine_mode mode,
 144                                               int *punsignedp,
 145                                               const_tree funtype ATTRIBUTE_UNUSED,
 146                                               int for_return ATTRIBUTE_UNUSED)
 147 {
 148   return promote_mode (type, mode, punsignedp);
 149 }
 150
 151 machine_mode
 152 default_cc_modes_compatible (machine_mode m1, machine_mode m2)
 153 {
 154   if (m1 == m2)
 155     return m1;
 156   return VOIDmode;
 157 }
 158
 159 bool
 160 default_return_in_memory (const_tree type,
 161                           const_tree fntype ATTRIBUTE_UNUSED)
 162 {
 163   return (TYPE_MODE (type) == BLKmode);
 164 }
 165
 166 rtx
 167 default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED,
 168                             machine_mode mode ATTRIBUTE_UNUSED)
 169 {
 170   return x;
 171 }
 172
 173 bool
 174 default_legitimize_address_displacement (rtx *, rtx *, poly_int64,
 175                                          machine_mode)
 176 {
 177   return false;
 178 }
 179
 180 bool
 181 default_const_not_ok_for_debug_p (rtx x)
 182 {
 183   if (GET_CODE (x) == UNSPEC)
 184     return true;
 185   return false;
 186 }
 187
 188 rtx
 189 default_expand_builtin_saveregs (void)
 190 {
 191   error ("__builtin_saveregs not supported by this target");
 192   return const0_rtx;
 193 }
 194
 195 void
 196 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED,
 197                                 machine_mode mode ATTRIBUTE_UNUSED,
 198                                 tree type ATTRIBUTE_UNUSED,
 199                                 int *pretend_arg_size ATTRIBUTE_UNUSED,
 200                                 int second_time ATTRIBUTE_UNUSED)
 201 {
 202 }
 203
 204 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE.  */
 205
 206 rtx
 207 default_builtin_setjmp_frame_value (void)
 208 {
 209   return virtual_stack_vars_rtx;
 210 }
 211
 212 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false.  */
 213
 214 bool
 215 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED)
 216 {
 217   return false;
 218 }
 219
 220 bool
 221 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED)
 222 {
 223   return (targetm.calls.setup_incoming_varargs
 224           != default_setup_incoming_varargs);
 225 }
 226
 227 scalar_int_mode
 228 default_eh_return_filter_mode (void)
 229 {
 230   return targetm.unwind_word_mode ();
 231 }
 232
 233 scalar_int_mode
 234 default_libgcc_cmp_return_mode (void)
 235 {
 236   return word_mode;
 237 }
 238
 239 scalar_int_mode
 240 default_libgcc_shift_count_mode (void)
 241 {
 242   return word_mode;
 243 }
 244
 245 scalar_int_mode
 246 default_unwind_word_mode (void)
 247 {
 248   return word_mode;
 249 }
 250
 251 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK.  */
 252
 253 unsigned HOST_WIDE_INT
 254 default_shift_truncation_mask (machine_mode mode)
 255 {
 256   return SHIFT_COUNT_TRUNCATED ? GET_MODE_UNIT_BITSIZE (mode) - 1 : 0;
 257 }
 258
 259 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL.  */
 260
 261 unsigned int
 262 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED)
 263 {
 264   return have_insn_for (DIV, mode) ? 3 : 2;
 265 }
 266
 267 /* The default implementation of TARGET_MODE_REP_EXTENDED.  */
 268
 269 int
 270 default_mode_rep_extended (scalar_int_mode, scalar_int_mode)
 271 {
 272   return UNKNOWN;
 273 }
 274
 275 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true.  */
 276
 277 bool
 278 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED)
 279 {
 280   return true;
 281 }
 282
 283 /* Return machine mode for non-standard suffix
 284    or VOIDmode if non-standard suffixes are unsupported.  */
 285 machine_mode
 286 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED)
 287 {
 288   return VOIDmode;
 289 }
 290
 291 /* The generic C++ ABI specifies this is a 64-bit value.  */
 292 tree
 293 default_cxx_guard_type (void)
 294 {
 295   return long_long_integer_type_node;
 296 }
 297
 298 /* Returns the size of the cookie to use when allocating an array
 299    whose elements have the indicated TYPE.  Assumes that it is already
 300    known that a cookie is needed.  */
 301
 302 tree
 303 default_cxx_get_cookie_size (tree type)
 304 {
 305   tree cookie_size;
 306
 307   /* We need to allocate an additional max (sizeof (size_t), alignof
 308      (true_type)) bytes.  */
 309   tree sizetype_size;
 310   tree type_align;
 311
 312   sizetype_size = size_in_bytes (sizetype);
 313   type_align = size_int (TYPE_ALIGN_UNIT (type));
 314   if (tree_int_cst_lt (type_align, sizetype_size))
 315     cookie_size = sizetype_size;
 316   else
 317     cookie_size = type_align;
 318
 319   return cookie_size;
 320 }
 321
 322 /* Return true if a parameter must be passed by reference.  This version
 323    of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK.  */
 324
 325 bool
 326 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED,
 327         machine_mode mode ATTRIBUTE_UNUSED, const_tree type ATTRIBUTE_UNUSED,
 328         bool named_arg ATTRIBUTE_UNUSED)
 329 {
 330   return targetm.calls.must_pass_in_stack (mode, type);
 331 }
 332
 333 /* Return true if a parameter follows callee copies conventions.  This
 334    version of the hook is true for all named arguments.  */
 335
 336 bool
 337 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED,
 338                           machine_mode mode ATTRIBUTE_UNUSED,
 339                           const_tree type ATTRIBUTE_UNUSED, bool named)
 340 {
 341   return named;
 342 }
 343
 344 /* Emit to STREAM the assembler syntax for insn operand X.  */
 345
 346 void
 347 default_print_operand (FILE *stream ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
 348                        int code ATTRIBUTE_UNUSED)
 349 {
 350 #ifdef PRINT_OPERAND
 351   PRINT_OPERAND (stream, x, code);
 352 #else
 353   gcc_unreachable ();
 354 #endif
 355 }
 356
 357 /* Emit to STREAM the assembler syntax for an insn operand whose memory
 358    address is X.  */
 359
 360 void
 361 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED,
 362                                machine_mode /*mode*/,
 363                                rtx x ATTRIBUTE_UNUSED)
 364 {
 365 #ifdef PRINT_OPERAND_ADDRESS
 366   PRINT_OPERAND_ADDRESS (stream, x);
 367 #else
 368   gcc_unreachable ();
 369 #endif
 370 }
 371
 372 /* Return true if CODE is a valid punctuation character for the
 373    `print_operand' hook.  */
 374
 375 bool
 376 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED)
 377 {
 378 #ifdef PRINT_OPERAND_PUNCT_VALID_P
 379   return PRINT_OPERAND_PUNCT_VALID_P (code);
 380 #else
 381   return false;
 382 #endif
 383 }
 384
 385 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME.  */
 386 tree
 387 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED)
 388 {
 389   const char *skipped = name + (*name == '*' ? 1 : 0);
 390   const char *stripped = targetm.strip_name_encoding (skipped);
 391   if (*name != '*' && user_label_prefix[0])
 392     stripped = ACONCAT ((user_label_prefix, stripped, NULL));
 393   return get_identifier (stripped);
 394 }
 395
 396 /* True if MODE is valid for the target.  By "valid", we mean able to
 397    be manipulated in non-trivial ways.  In particular, this means all
 398    the arithmetic is supported.
 399
 400    By default we guess this means that any C type is supported.  If
 401    we can't map the mode back to a type that would be available in C,
 402    then reject it.  Special case, here, is the double-word arithmetic
 403    supported by optabs.c.  */
 404
 405 bool
 406 default_scalar_mode_supported_p (scalar_mode mode)
 407 {
 408   int precision = GET_MODE_PRECISION (mode);
 409
 410   switch (GET_MODE_CLASS (mode))
 411     {
 412     case MODE_PARTIAL_INT:
 413     case MODE_INT:
 414       if (precision == CHAR_TYPE_SIZE)
 415         return true;
 416       if (precision == SHORT_TYPE_SIZE)
 417         return true;
 418       if (precision == INT_TYPE_SIZE)
 419         return true;
 420       if (precision == LONG_TYPE_SIZE)
 421         return true;
 422       if (precision == LONG_LONG_TYPE_SIZE)
 423         return true;
 424       if (precision == 2 * BITS_PER_WORD)
 425         return true;
 426       return false;
 427
 428     case MODE_FLOAT:
 429       if (precision == FLOAT_TYPE_SIZE)
 430         return true;
 431       if (precision == DOUBLE_TYPE_SIZE)
 432         return true;
 433       if (precision == LONG_DOUBLE_TYPE_SIZE)
 434         return true;
 435       return false;
 436
 437     case MODE_DECIMAL_FLOAT:
 438     case MODE_FRACT:
 439     case MODE_UFRACT:
 440     case MODE_ACCUM:
 441     case MODE_UACCUM:
 442       return false;
 443
 444     default:
 445       gcc_unreachable ();
 446     }
 447 }
 448
 449 /* Return true if libgcc supports floating-point mode MODE (known to
 450    be supported as a scalar mode).  */
 451
 452 bool
 453 default_libgcc_floating_mode_supported_p (scalar_float_mode mode)
 454 {
 455   switch (mode)
 456     {
 457 #ifdef HAVE_SFmode
 458     case E_SFmode:
 459 #endif
 460 #ifdef HAVE_DFmode
 461     case E_DFmode:
 462 #endif
 463 #ifdef HAVE_XFmode
 464     case E_XFmode:
 465 #endif
 466 #ifdef HAVE_TFmode
 467     case E_TFmode:
 468 #endif
 469       return true;
 470
 471     default:
 472       return false;
 473     }
 474 }
 475
 476 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
 477    false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
 478    supported.  */
 479 opt_scalar_float_mode
 480 default_floatn_mode (int n, bool extended)
 481 {
 482   if (extended)
 483     {
 484       opt_scalar_float_mode cand1, cand2;
 485       scalar_float_mode mode;
 486       switch (n)
 487         {
 488         case 32:
 489 #ifdef HAVE_DFmode
 490           cand1 = DFmode;
 491 #endif
 492           break;
 493
 494         case 64:
 495 #ifdef HAVE_XFmode
 496           cand1 = XFmode;
 497 #endif
 498 #ifdef HAVE_TFmode
 499           cand2 = TFmode;
 500 #endif
 501           break;
 502
 503         case 128:
 504           break;
 505
 506         default:
 507           /* Those are the only valid _FloatNx types.  */
 508           gcc_unreachable ();
 509         }
 510       if (cand1.exists (&mode)
 511           && REAL_MODE_FORMAT (mode)->ieee_bits > n
 512           && targetm.scalar_mode_supported_p (mode)
 513           && targetm.libgcc_floating_mode_supported_p (mode))
 514         return cand1;
 515       if (cand2.exists (&mode)
 516           && REAL_MODE_FORMAT (mode)->ieee_bits > n
 517           && targetm.scalar_mode_supported_p (mode)
 518           && targetm.libgcc_floating_mode_supported_p (mode))
 519         return cand2;
 520     }
 521   else
 522     {
 523       opt_scalar_float_mode cand;
 524       scalar_float_mode mode;
 525       switch (n)
 526         {
 527         case 16:
 528           /* Always enable _Float16 if we have basic support for the mode.
 529              Targets can control the range and precision of operations on
 530              the _Float16 type using TARGET_C_EXCESS_PRECISION.  */
 531 #ifdef HAVE_HFmode
 532           cand = HFmode;
 533 #endif
 534           break;
 535
 536         case 32:
 537 #ifdef HAVE_SFmode
 538           cand = SFmode;
 539 #endif
 540           break;
 541
 542         case 64:
 543 #ifdef HAVE_DFmode
 544           cand = DFmode;
 545 #endif
 546           break;
 547
 548         case 128:
 549 #ifdef HAVE_TFmode
 550           cand = TFmode;
 551 #endif
 552           break;
 553
 554         default:
 555           break;
 556         }
 557       if (cand.exists (&mode)
 558           && REAL_MODE_FORMAT (mode)->ieee_bits == n
 559           && targetm.scalar_mode_supported_p (mode)
 560           && targetm.libgcc_floating_mode_supported_p (mode))
 561         return cand;
 562     }
 563   return opt_scalar_float_mode ();
 564 }
 565
 566 /* Define this to return true if the _Floatn and _Floatnx built-in functions
 567    should implicitly enable the built-in function without the __builtin_ prefix
 568    in addition to the normal built-in function with the __builtin_ prefix.  The
 569    default is to only enable built-in functions without the __builtin_ prefix
 570    for the GNU C langauge.  The argument FUNC is the enum builtin_in_function
 571    id of the function to be enabled.  */
 572
 573 bool
 574 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED)
 575 {
 576   static bool first_time_p = true;
 577   static bool c_or_objective_c;
 578
 579   if (first_time_p)
 580     {
 581       first_time_p = false;
 582       c_or_objective_c = lang_GNU_C () || lang_GNU_OBJC ();
 583     }
 584
 585   return c_or_objective_c;
 586 }
 587
 588 /* Make some target macros useable by target-independent code.  */
 589 bool
 590 targhook_words_big_endian (void)
 591 {
 592   return !!WORDS_BIG_ENDIAN;
 593 }
 594
 595 bool
 596 targhook_float_words_big_endian (void)
 597 {
 598   return !!FLOAT_WORDS_BIG_ENDIAN;
 599 }
 600
 601 /* True if the target supports floating-point exceptions and rounding
 602    modes.  */
 603
 604 bool
 605 default_float_exceptions_rounding_supported_p (void)
 606 {
 607 #ifdef HAVE_adddf3
 608   return HAVE_adddf3;
 609 #else
 610   return false;
 611 #endif
 612 }
 613
 614 /* True if the target supports decimal floating point.  */
 615
 616 bool
 617 default_decimal_float_supported_p (void)
 618 {
 619   return ENABLE_DECIMAL_FLOAT;
 620 }
 621
 622 /* True if the target supports fixed-point arithmetic.  */
 623
 624 bool
 625 default_fixed_point_supported_p (void)
 626 {
 627   return ENABLE_FIXED_POINT;
 628 }
 629
 630 /* True if the target supports GNU indirect functions.  */
 631
 632 bool
 633 default_has_ifunc_p (void)
 634 {
 635   return HAVE_GNU_INDIRECT_FUNCTION;
 636 }
 637
 638 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
 639    an error message.
 640
 641    This function checks whether a given INSN is valid within a low-overhead
 642    loop.  If INSN is invalid it returns the reason for that, otherwise it
 643    returns NULL. A called function may clobber any special registers required
 644    for low-overhead looping. Additionally, some targets (eg, PPC) use the count
 645    register for branch on table instructions. We reject the doloop pattern in
 646    these cases.  */
 647
 648 const char *
 649 default_invalid_within_doloop (const rtx_insn *insn)
 650 {
 651   if (CALL_P (insn))
 652     return "Function call in loop.";
 653
 654   if (tablejump_p (insn, NULL, NULL) || computed_jump_p (insn))
 655     return "Computed branch in the loop.";
 656
 657   return NULL;
 658 }
 659
 660 /* Mapping of builtin functions to vectorized variants.  */
 661
 662 tree
 663 default_builtin_vectorized_function (unsigned int, tree, tree)
 664 {
 665   return NULL_TREE;
 666 }
 667
 668 /* Mapping of target builtin functions to vectorized variants.  */
 669
 670 tree
 671 default_builtin_md_vectorized_function (tree, tree, tree)
 672 {
 673   return NULL_TREE;
 674 }
 675
 676 /* Vectorized conversion.  */
 677
 678 tree
 679 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
 680                                        tree dest_type ATTRIBUTE_UNUSED,
 681                                        tree src_type ATTRIBUTE_UNUSED)
 682 {
 683   return NULL_TREE;
 684 }
 685
 686 /* Default vectorizer cost model values.  */
 687
 688 int
 689 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
 690                                     tree vectype,
 691                                     int misalign ATTRIBUTE_UNUSED)
 692 {
 693   switch (type_of_cost)
 694     {
 695       case scalar_stmt:
 696       case scalar_load:
 697       case scalar_store:
 698       case vector_stmt:
 699       case vector_load:
 700       case vector_store:
 701       case vec_to_scalar:
 702       case scalar_to_vec:
 703       case cond_branch_not_taken:
 704       case vec_perm:
 705       case vec_promote_demote:
 706         return 1;
 707
 708       case unaligned_load:
 709       case unaligned_store:
 710         return 2;
 711
 712       case cond_branch_taken:
 713         return 3;
 714
 715       case vec_construct:
 716         return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype)) - 1;
 717
 718       default:
 719         gcc_unreachable ();
 720     }
 721 }
 722
 723 /* Reciprocal.  */
 724
 725 tree
 726 default_builtin_reciprocal (tree)
 727 {
 728   return NULL_TREE;
 729 }
 730
 731 bool
 732 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
 733         cumulative_args_t ca ATTRIBUTE_UNUSED,
 734         machine_mode mode ATTRIBUTE_UNUSED,
 735         const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 736 {
 737   return false;
 738 }
 739
 740 bool
 741 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
 742         cumulative_args_t ca ATTRIBUTE_UNUSED,
 743         machine_mode mode ATTRIBUTE_UNUSED,
 744         const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 745 {
 746   return true;
 747 }
 748
 749 int
 750 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
 751         cumulative_args_t ca ATTRIBUTE_UNUSED,
 752         machine_mode mode ATTRIBUTE_UNUSED,
 753         tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 754 {
 755   return 0;
 756 }
 757
 758 void
 759 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED,
 760                                 tree ATTRIBUTE_UNUSED)
 761 {
 762 }
 763
 764 void
 765 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED,
 766                               machine_mode mode ATTRIBUTE_UNUSED,
 767                               const_tree type ATTRIBUTE_UNUSED,
 768                               bool named ATTRIBUTE_UNUSED)
 769 {
 770   gcc_unreachable ();
 771 }
 772
 773 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET.  */
 774
 775 HOST_WIDE_INT
 776 default_function_arg_offset (machine_mode, const_tree)
 777 {
 778   return 0;
 779 }
 780
 781 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
 782    upward, but pad short args downward on big-endian machines.  */
 783
 784 pad_direction
 785 default_function_arg_padding (machine_mode mode, const_tree type)
 786 {
 787   if (!BYTES_BIG_ENDIAN)
 788     return PAD_UPWARD;
 789
 790   unsigned HOST_WIDE_INT size;
 791   if (mode == BLKmode)
 792     {
 793       if (!type || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
 794         return PAD_UPWARD;
 795       size = int_size_in_bytes (type);
 796     }
 797   else
 798     /* Targets with variable-sized modes must override this hook
 799        and handle variable-sized modes explicitly.  */
 800     size = GET_MODE_SIZE (mode).to_constant ();
 801
 802   if (size < (PARM_BOUNDARY / BITS_PER_UNIT))
 803     return PAD_DOWNWARD;
 804
 805   return PAD_UPWARD;
 806 }
 807
 808 rtx
 809 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 810                       machine_mode mode ATTRIBUTE_UNUSED,
 811                       const_tree type ATTRIBUTE_UNUSED,
 812                       bool named ATTRIBUTE_UNUSED)
 813 {
 814   gcc_unreachable ();
 815 }
 816
 817 rtx
 818 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 819                                machine_mode mode ATTRIBUTE_UNUSED,
 820                                const_tree type ATTRIBUTE_UNUSED,
 821                                bool named ATTRIBUTE_UNUSED)
 822 {
 823   gcc_unreachable ();
 824 }
 825
 826 unsigned int
 827 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 828                                const_tree type ATTRIBUTE_UNUSED)
 829 {
 830   return PARM_BOUNDARY;
 831 }
 832
 833 unsigned int
 834 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 835                                      const_tree type ATTRIBUTE_UNUSED)
 836 {
 837   return PARM_BOUNDARY;
 838 }
 839
 840 void
 841 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
 842 {
 843 }
 844
 845 const char *
 846 hook_invalid_arg_for_unprototyped_fn (
 847         const_tree typelist ATTRIBUTE_UNUSED,
 848         const_tree funcdecl ATTRIBUTE_UNUSED,
 849         const_tree val ATTRIBUTE_UNUSED)
 850 {
 851   return NULL;
 852 }
 853
 854 /* Initialize the stack protection decls.  */
 855
 856 /* Stack protection related decls living in libgcc.  */
 857 static GTY(()) tree stack_chk_guard_decl;
 858
 859 tree
 860 default_stack_protect_guard (void)
 861 {
 862   tree t = stack_chk_guard_decl;
 863
 864   if (t == NULL)
 865     {
 866       rtx x;
 867
 868       t = build_decl (UNKNOWN_LOCATION,
 869                       VAR_DECL, get_identifier ("__stack_chk_guard"),
 870                       ptr_type_node);
 871       TREE_STATIC (t) = 1;
 872       TREE_PUBLIC (t) = 1;
 873       DECL_EXTERNAL (t) = 1;
 874       TREE_USED (t) = 1;
 875       TREE_THIS_VOLATILE (t) = 1;
 876       DECL_ARTIFICIAL (t) = 1;
 877       DECL_IGNORED_P (t) = 1;
 878
 879       /* Do not share RTL as the declaration is visible outside of
 880          current function.  */
 881       x = DECL_RTL (t);
 882       RTX_FLAG (x, used) = 1;
 883
 884       stack_chk_guard_decl = t;
 885     }
 886
 887   return t;
 888 }
 889
 890 static GTY(()) tree stack_chk_fail_decl;
 891
 892 tree
 893 default_external_stack_protect_fail (void)
 894 {
 895   tree t = stack_chk_fail_decl;
 896
 897   if (t == NULL_TREE)
 898     {
 899       t = build_function_type_list (void_type_node, NULL_TREE);
 900       t = build_decl (UNKNOWN_LOCATION,
 901                       FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
 902       TREE_STATIC (t) = 1;
 903       TREE_PUBLIC (t) = 1;
 904       DECL_EXTERNAL (t) = 1;
 905       TREE_USED (t) = 1;
 906       TREE_THIS_VOLATILE (t) = 1;
 907       TREE_NOTHROW (t) = 1;
 908       DECL_ARTIFICIAL (t) = 1;
 909       DECL_IGNORED_P (t) = 1;
 910       DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
 911       DECL_VISIBILITY_SPECIFIED (t) = 1;
 912
 913       stack_chk_fail_decl = t;
 914     }
 915
 916   return build_call_expr (t, 0);
 917 }
 918
 919 tree
 920 default_hidden_stack_protect_fail (void)
 921 {
 922 #ifndef HAVE_GAS_HIDDEN
 923   return default_external_stack_protect_fail ();
 924 #else
 925   tree t = stack_chk_fail_decl;
 926
 927   if (!flag_pic)
 928     return default_external_stack_protect_fail ();
 929
 930   if (t == NULL_TREE)
 931     {
 932       t = build_function_type_list (void_type_node, NULL_TREE);
 933       t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
 934                       get_identifier ("__stack_chk_fail_local"), t);
 935       TREE_STATIC (t) = 1;
 936       TREE_PUBLIC (t) = 1;
 937       DECL_EXTERNAL (t) = 1;
 938       TREE_USED (t) = 1;
 939       TREE_THIS_VOLATILE (t) = 1;
 940       TREE_NOTHROW (t) = 1;
 941       DECL_ARTIFICIAL (t) = 1;
 942       DECL_IGNORED_P (t) = 1;
 943       DECL_VISIBILITY_SPECIFIED (t) = 1;
 944       DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
 945
 946       stack_chk_fail_decl = t;
 947     }
 948
 949   return build_call_expr (t, 0);
 950 #endif
 951 }
 952
 953 bool
 954 hook_bool_const_rtx_commutative_p (const_rtx x,
 955                                    int outer_code ATTRIBUTE_UNUSED)
 956 {
 957   return COMMUTATIVE_P (x);
 958 }
 959
 960 rtx
 961 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
 962                         const_tree fn_decl_or_type,
 963                         bool outgoing ATTRIBUTE_UNUSED)
 964 {
 965   /* The old interface doesn't handle receiving the function type.  */
 966   if (fn_decl_or_type
 967       && !DECL_P (fn_decl_or_type))
 968     fn_decl_or_type = NULL;
 969
 970 #ifdef FUNCTION_VALUE
 971   return FUNCTION_VALUE (ret_type, fn_decl_or_type);
 972 #else
 973   gcc_unreachable ();
 974 #endif
 975 }
 976
 977 rtx
 978 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED,
 979                        const_rtx fun ATTRIBUTE_UNUSED)
 980 {
 981 #ifdef LIBCALL_VALUE
 982   return LIBCALL_VALUE (MACRO_MODE (mode));
 983 #else
 984   gcc_unreachable ();
 985 #endif
 986 }
 987
 988 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P.  */
 989
 990 bool
 991 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
 992 {
 993 #ifdef FUNCTION_VALUE_REGNO_P
 994   return FUNCTION_VALUE_REGNO_P (regno);
 995 #else
 996   gcc_unreachable ();
 997 #endif
 998 }
 999
1000 rtx
1001 default_internal_arg_pointer (void)
1002 {
1003   /* If the reg that the virtual arg pointer will be translated into is
1004      not a fixed reg or is the stack pointer, make a copy of the virtual
1005      arg pointer, and address parms via the copy.  The frame pointer is
1006      considered fixed even though it is not marked as such.  */
1007   if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
1008        || ! (fixed_regs[ARG_POINTER_REGNUM]
1009              || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
1010     return copy_to_reg (virtual_incoming_args_rtx);
1011   else
1012     return virtual_incoming_args_rtx;
1013 }
1014
1015 rtx
1016 default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
1017 {
1018   if (incoming_p)
1019     {
1020 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1021       return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
1022 #endif
1023     }
1024
1025 #ifdef STATIC_CHAIN_REGNUM
1026   return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
1027 #endif
1028
1029   {
1030     static bool issued_error;
1031     if (!issued_error)
1032       {
1033         issued_error = true;
1034         sorry ("nested functions not supported on this target");
1035       }
1036
1037     /* It really doesn't matter what we return here, so long at it
1038        doesn't cause the rest of the compiler to crash.  */
1039     return gen_rtx_MEM (Pmode, stack_pointer_rtx);
1040   }
1041 }
1042
1043 void
1044 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
1045                          rtx ARG_UNUSED (r_chain))
1046 {
1047   sorry ("nested function trampolines not supported on this target");
1048 }
1049
1050 poly_int64
1051 default_return_pops_args (tree, tree, poly_int64)
1052 {
1053   return 0;
1054 }
1055
1056 reg_class_t
1057 default_branch_target_register_class (void)
1058 {
1059   return NO_REGS;
1060 }
1061
1062 reg_class_t
1063 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED,
1064                                          reg_class_t cl,
1065                                          reg_class_t best_cl ATTRIBUTE_UNUSED)
1066 {
1067   return cl;
1068 }
1069
1070 extern bool
1071 default_lra_p (void)
1072 {
1073   return true;
1074 }
1075
1076 int
1077 default_register_priority (int hard_regno ATTRIBUTE_UNUSED)
1078 {
1079   return 0;
1080 }
1081
1082 extern bool
1083 default_register_usage_leveling_p (void)
1084 {
1085   return false;
1086 }
1087
1088 extern bool
1089 default_different_addr_displacement_p (void)
1090 {
1091   return false;
1092 }
1093
1094 reg_class_t
1095 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
1096                           reg_class_t reload_class_i ATTRIBUTE_UNUSED,
1097                           machine_mode reload_mode ATTRIBUTE_UNUSED,
1098                           secondary_reload_info *sri)
1099 {
1100   enum reg_class rclass = NO_REGS;
1101   enum reg_class reload_class = (enum reg_class) reload_class_i;
1102
1103   if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
1104     {
1105       sri->icode = sri->prev_sri->t_icode;
1106       return NO_REGS;
1107     }
1108 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1109   if (in_p)
1110     rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class,
1111                                            MACRO_MODE (reload_mode), x);
1112 #endif
1113 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1114   if (! in_p)
1115     rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class,
1116                                             MACRO_MODE (reload_mode), x);
1117 #endif
1118   if (rclass != NO_REGS)
1119     {
1120       enum insn_code icode
1121         = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
1122                                 reload_mode);
1123
1124       if (icode != CODE_FOR_nothing
1125           && !insn_operand_matches (icode, in_p, x))
1126         icode = CODE_FOR_nothing;
1127       else if (icode != CODE_FOR_nothing)
1128         {
1129           const char *insn_constraint, *scratch_constraint;
1130           enum reg_class insn_class, scratch_class;
1131
1132           gcc_assert (insn_data[(int) icode].n_operands == 3);
1133           insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
1134           if (!*insn_constraint)
1135             insn_class = ALL_REGS;
1136           else
1137             {
1138               if (in_p)
1139                 {
1140                   gcc_assert (*insn_constraint == '=');
1141                   insn_constraint++;
1142                 }
1143               insn_class = (reg_class_for_constraint
1144                             (lookup_constraint (insn_constraint)));
1145               gcc_assert (insn_class != NO_REGS);
1146             }
1147
1148           scratch_constraint = insn_data[(int) icode].operand[2].constraint;
1149           /* The scratch register's constraint must start with "=&",
1150              except for an input reload, where only "=" is necessary,
1151              and where it might be beneficial to re-use registers from
1152              the input.  */
1153           gcc_assert (scratch_constraint[0] == '='
1154                       && (in_p || scratch_constraint[1] == '&'));
1155           scratch_constraint++;
1156           if (*scratch_constraint == '&')
1157             scratch_constraint++;
1158           scratch_class = (reg_class_for_constraint
1159                            (lookup_constraint (scratch_constraint)));
1160
1161           if (reg_class_subset_p (reload_class, insn_class))
1162             {
1163               gcc_assert (scratch_class == rclass);
1164               rclass = NO_REGS;
1165             }
1166           else
1167             rclass = insn_class;
1168
1169         }
1170       if (rclass == NO_REGS)
1171         sri->icode = icode;
1172       else
1173         sri->t_icode = icode;
1174     }
1175   return rclass;
1176 }
1177
1178 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE.  */
1179
1180 machine_mode
1181 default_secondary_memory_needed_mode (machine_mode mode)
1182 {
1183   if (!targetm.lra_p ()
1184       && known_lt (GET_MODE_BITSIZE (mode), BITS_PER_WORD)
1185       && INTEGRAL_MODE_P (mode))
1186     return mode_for_size (BITS_PER_WORD, GET_MODE_CLASS (mode), 0).require ();
1187   return mode;
1188 }
1189
1190 /* By default, if flag_pic is true, then neither local nor global relocs
1191    should be placed in readonly memory.  */
1192
1193 int
1194 default_reloc_rw_mask (void)
1195 {
1196   return flag_pic ? 3 : 0;
1197 }
1198
1199 /* By default, do no modification. */
1200 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
1201                                          tree id)
1202 {
1203    return id;
1204 }
1205
1206 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT.  */
1207
1208 HOST_WIDE_INT
1209 default_static_rtx_alignment (machine_mode mode)
1210 {
1211   return GET_MODE_ALIGNMENT (mode);
1212 }
1213
1214 /* The default implementation of TARGET_CONSTANT_ALIGNMENT.  */
1215
1216 HOST_WIDE_INT
1217 default_constant_alignment (const_tree, HOST_WIDE_INT align)
1218 {
1219   return align;
1220 }
1221
1222 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1223    to at least BITS_PER_WORD but otherwise makes no changes.  */
1224
1225 HOST_WIDE_INT
1226 constant_alignment_word_strings (const_tree exp, HOST_WIDE_INT align)
1227 {
1228   if (TREE_CODE (exp) == STRING_CST)
1229     return MAX (align, BITS_PER_WORD);
1230   return align;
1231 }
1232
1233 /* Default to natural alignment for vector types.  */
1234 HOST_WIDE_INT
1235 default_vector_alignment (const_tree type)
1236 {
1237   HOST_WIDE_INT align = tree_to_shwi (TYPE_SIZE (type));
1238   if (align > MAX_OFILE_ALIGNMENT)
1239     align = MAX_OFILE_ALIGNMENT;
1240   return align;
1241 }
1242
1243 /* The default implementation of
1244    TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT.  */
1245
1246 HOST_WIDE_INT
1247 default_preferred_vector_alignment (const_tree type)
1248 {
1249   return TYPE_ALIGN (type);
1250 }
1251
1252 /* By default assume vectors of element TYPE require a multiple of the natural
1253    alignment of TYPE.  TYPE is naturally aligned if IS_PACKED is false.  */
1254 bool
1255 default_builtin_vector_alignment_reachable (const_tree /*type*/, bool is_packed)
1256 {
1257   return ! is_packed;
1258 }
1259
1260 /* By default, assume that a target supports any factor of misalignment
1261    memory access if it supports movmisalign patten.
1262    is_packed is true if the memory access is defined in a packed struct.  */
1263 bool
1264 default_builtin_support_vector_misalignment (machine_mode mode,
1265                                              const_tree type
1266                                              ATTRIBUTE_UNUSED,
1267                                              int misalignment
1268                                              ATTRIBUTE_UNUSED,
1269                                              bool is_packed
1270                                              ATTRIBUTE_UNUSED)
1271 {
1272   if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1273     return true;
1274   return false;
1275 }
1276
1277 /* By default, only attempt to parallelize bitwise operations, and
1278    possibly adds/subtracts using bit-twiddling.  */
1279
1280 machine_mode
1281 default_preferred_simd_mode (scalar_mode)
1282 {
1283   return word_mode;
1284 }
1285
1286 /* By default do not split reductions further.  */
1287
1288 machine_mode
1289 default_split_reduction (machine_mode mode)
1290 {
1291   return mode;
1292 }
1293
1294 /* By default only the size derived from the preferred vector mode
1295    is tried.  */
1296
1297 void
1298 default_autovectorize_vector_sizes (vector_sizes *)
1299 {
1300 }
1301
1302 /* By default a vector of integers is used as a mask.  */
1303
1304 opt_machine_mode
1305 default_get_mask_mode (poly_uint64 nunits, poly_uint64 vector_size)
1306 {
1307   unsigned int elem_size = vector_element_size (vector_size, nunits);
1308   scalar_int_mode elem_mode
1309     = smallest_int_mode_for_size (elem_size * BITS_PER_UNIT);
1310   machine_mode vector_mode;
1311
1312   gcc_assert (known_eq (elem_size * nunits, vector_size));
1313
1314   if (mode_for_vector (elem_mode, nunits).exists (&vector_mode)
1315       && VECTOR_MODE_P (vector_mode)
1316       && targetm.vector_mode_supported_p (vector_mode))
1317     return vector_mode;
1318
1319   return opt_machine_mode ();
1320 }
1321
1322 /* By default consider masked stores to be expensive.  */
1323
1324 bool
1325 default_empty_mask_is_expensive (unsigned ifn)
1326 {
1327   return ifn == IFN_MASK_STORE;
1328 }
1329
1330 /* By default, the cost model accumulates three separate costs (prologue,
1331    loop body, and epilogue) for a vectorized loop or block.  So allocate an
1332    array of three unsigned ints, set it to zero, and return its address.  */
1333
1334 void *
1335 default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED)
1336 {
1337   unsigned *cost = XNEWVEC (unsigned, 3);
1338   cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0;
1339   return cost;
1340 }
1341
1342 /* By default, the cost model looks up the cost of the given statement
1343    kind and mode, multiplies it by the occurrence count, accumulates
1344    it into the cost specified by WHERE, and returns the cost added.  */
1345
1346 unsigned
1347 default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
1348                        struct _stmt_vec_info *stmt_info, int misalign,
1349                        enum vect_cost_model_location where)
1350 {
1351   unsigned *cost = (unsigned *) data;
1352   unsigned retval = 0;
1353
1354   tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE;
1355   int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype,
1356                                                                 misalign);
1357    /* Statements in an inner loop relative to the loop being
1358       vectorized are weighted more heavily.  The value here is
1359       arbitrary and could potentially be improved with analysis.  */
1360   if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info))
1361     count *= 50;  /* FIXME.  */
1362
1363   retval = (unsigned) (count * stmt_cost);
1364   cost[where] += retval;
1365
1366   return retval;
1367 }
1368
1369 /* By default, the cost model just returns the accumulated costs.  */
1370
1371 void
1372 default_finish_cost (void *data, unsigned *prologue_cost,
1373                      unsigned *body_cost, unsigned *epilogue_cost)
1374 {
1375   unsigned *cost = (unsigned *) data;
1376   *prologue_cost = cost[vect_prologue];
1377   *body_cost     = cost[vect_body];
1378   *epilogue_cost = cost[vect_epilogue];
1379 }
1380
1381 /* Free the cost data.  */
1382
1383 void
1384 default_destroy_cost_data (void *data)
1385 {
1386   free (data);
1387 }
1388
1389 /* Determine whether or not a pointer mode is valid. Assume defaults
1390    of ptr_mode or Pmode - can be overridden.  */
1391 bool
1392 default_valid_pointer_mode (scalar_int_mode mode)
1393 {
1394   return (mode == ptr_mode || mode == Pmode);
1395 }
1396
1397 /* Determine whether the memory reference specified by REF may alias
1398    the C libraries errno location.  */
1399 bool
1400 default_ref_may_alias_errno (ao_ref *ref)
1401 {
1402   tree base = ao_ref_base (ref);
1403   /* The default implementation assumes the errno location is
1404      a declaration of type int or is always accessed via a
1405      pointer to int.  We assume that accesses to errno are
1406      not deliberately obfuscated (even in conforming ways).  */
1407   if (TYPE_UNSIGNED (TREE_TYPE (base))
1408       || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1409     return false;
1410   /* The default implementation assumes an errno location
1411      declaration is never defined in the current compilation unit.  */
1412   if (DECL_P (base)
1413       && !TREE_STATIC (base))
1414     return true;
1415   else if (TREE_CODE (base) == MEM_REF
1416            && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1417     {
1418       struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1419       return !pi || pi->pt.anything || pi->pt.nonlocal;
1420     }
1421   return false;
1422 }
1423
1424 /* Return the mode for a pointer to a given ADDRSPACE,
1425    defaulting to ptr_mode for all address spaces.  */
1426
1427 scalar_int_mode
1428 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1429 {
1430   return ptr_mode;
1431 }
1432
1433 /* Return the mode for an address in a given ADDRSPACE,
1434    defaulting to Pmode for all address spaces.  */
1435
1436 scalar_int_mode
1437 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1438 {
1439   return Pmode;
1440 }
1441
1442 /* Named address space version of valid_pointer_mode.
1443    To match the above, the same modes apply to all address spaces.  */
1444
1445 bool
1446 default_addr_space_valid_pointer_mode (scalar_int_mode mode,
1447                                        addr_space_t as ATTRIBUTE_UNUSED)
1448 {
1449   return targetm.valid_pointer_mode (mode);
1450 }
1451
1452 /* Some places still assume that all pointer or address modes are the
1453    standard Pmode and ptr_mode.  These optimizations become invalid if
1454    the target actually supports multiple different modes.  For now,
1455    we disable such optimizations on such targets, using this function.  */
1456
1457 bool
1458 target_default_pointer_address_modes_p (void)
1459 {
1460   if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1461     return false;
1462   if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1463     return false;
1464
1465   return true;
1466 }
1467
1468 /* Named address space version of legitimate_address_p.
1469    By default, all address spaces have the same form.  */
1470
1471 bool
1472 default_addr_space_legitimate_address_p (machine_mode mode, rtx mem,
1473                                          bool strict,
1474                                          addr_space_t as ATTRIBUTE_UNUSED)
1475 {
1476   return targetm.legitimate_address_p (mode, mem, strict);
1477 }
1478
1479 /* Named address space version of LEGITIMIZE_ADDRESS.
1480    By default, all address spaces have the same form.  */
1481
1482 rtx
1483 default_addr_space_legitimize_address (rtx x, rtx oldx, machine_mode mode,
1484                                        addr_space_t as ATTRIBUTE_UNUSED)
1485 {
1486   return targetm.legitimize_address (x, oldx, mode);
1487 }
1488
1489 /* The default hook for determining if one named address space is a subset of
1490    another and to return which address space to use as the common address
1491    space.  */
1492
1493 bool
1494 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1495 {
1496   return (subset == superset);
1497 }
1498
1499 /* The default hook for determining if 0 within a named address
1500    space is a valid address.  */
1501
1502 bool
1503 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED)
1504 {
1505   return false;
1506 }
1507
1508 /* The default hook for debugging the address space is to return the
1509    address space number to indicate DW_AT_address_class.  */
1510 int
1511 default_addr_space_debug (addr_space_t as)
1512 {
1513   return as;
1514 }
1515
1516 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1517    Don't complain about any address space.  */
1518
1519 void
1520 default_addr_space_diagnose_usage (addr_space_t, location_t)
1521 {
1522 }
1523
1524
1525 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1526    called for targets with only a generic address space.  */
1527
1528 rtx
1529 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1530                             tree from_type ATTRIBUTE_UNUSED,
1531                             tree to_type ATTRIBUTE_UNUSED)
1532 {
1533   gcc_unreachable ();
1534 }
1535
1536 /* The defualt implementation of TARGET_HARD_REGNO_NREGS.  */
1537
1538 unsigned int
1539 default_hard_regno_nregs (unsigned int, machine_mode mode)
1540 {
1541   /* Targets with variable-sized modes must provide their own definition
1542      of this hook.  */
1543   return CEIL (GET_MODE_SIZE (mode).to_constant (), UNITS_PER_WORD);
1544 }
1545
1546 bool
1547 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1548 {
1549   return true;
1550 }
1551
1552 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P.  */
1553
1554 bool
1555 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED,
1556                                   addr_space_t addrspace ATTRIBUTE_UNUSED)
1557 {
1558   return false;
1559 }
1560
1561 bool
1562 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1563                                          tree ARG_UNUSED (name),
1564                                          tree ARG_UNUSED (args),
1565                                          int ARG_UNUSED (flags))
1566 {
1567   warning (OPT_Wattributes,
1568            "target attribute is not supported on this machine");
1569
1570   return false;
1571 }
1572
1573 bool
1574 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1575                                     tree ARG_UNUSED (pop_target))
1576 {
1577   /* If args is NULL the caller is handle_pragma_pop_options ().  In that case,
1578      emit no warning because "#pragma GCC pop_target" is valid on targets that
1579      do not have the "target" pragma.  */
1580   if (args)
1581     warning (OPT_Wpragmas,
1582              "#pragma GCC target is not supported for this machine");
1583
1584   return false;
1585 }
1586
1587 bool
1588 default_target_can_inline_p (tree caller, tree callee)
1589 {
1590   tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1591   tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1592   if (! callee_opts)
1593     callee_opts = target_option_default_node;
1594   if (! caller_opts)
1595     caller_opts = target_option_default_node;
1596
1597   /* If both caller and callee have attributes, assume that if the
1598      pointer is different, the two functions have different target
1599      options since build_target_option_node uses a hash table for the
1600      options.  */
1601   return callee_opts == caller_opts;
1602 }
1603
1604 /* If the machine does not have a case insn that compares the bounds,
1605    this means extra overhead for dispatch tables, which raises the
1606    threshold for using them.  */
1607
1608 unsigned int
1609 default_case_values_threshold (void)
1610 {
1611   return (targetm.have_casesi () ? 4 : 5);
1612 }
1613
1614 bool
1615 default_have_conditional_execution (void)
1616 {
1617   return HAVE_conditional_execution;
1618 }
1619
1620 /* By default we assume that c99 functions are present at the runtime,
1621    but sincos is not.  */
1622 bool
1623 default_libc_has_function (enum function_class fn_class)
1624 {
1625   if (fn_class == function_c94
1626       || fn_class == function_c99_misc
1627       || fn_class == function_c99_math_complex)
1628     return true;
1629
1630   return false;
1631 }
1632
1633 bool
1634 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1635 {
1636   return true;
1637 }
1638
1639 bool
1640 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1641 {
1642   return false;
1643 }
1644
1645 tree
1646 default_builtin_tm_load_store (tree ARG_UNUSED (type))
1647 {
1648   return NULL_TREE;
1649 }
1650
1651 /* Compute cost of moving registers to/from memory.  */
1652
1653 int
1654 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1655                           reg_class_t rclass ATTRIBUTE_UNUSED,
1656                           bool in ATTRIBUTE_UNUSED)
1657 {
1658 #ifndef MEMORY_MOVE_COST
1659     return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1660 #else
1661     return MEMORY_MOVE_COST (MACRO_MODE (mode), (enum reg_class) rclass, in);
1662 #endif
1663 }
1664
1665 /* Compute cost of moving data from a register of class FROM to one of
1666    TO, using MODE.  */
1667
1668 int
1669 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1670                             reg_class_t from ATTRIBUTE_UNUSED,
1671                             reg_class_t to ATTRIBUTE_UNUSED)
1672 {
1673 #ifndef REGISTER_MOVE_COST
1674   return 2;
1675 #else
1676   return REGISTER_MOVE_COST (MACRO_MODE (mode),
1677                              (enum reg_class) from, (enum reg_class) to);
1678 #endif
1679 }
1680
1681 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS.  */
1682
1683 bool
1684 default_slow_unaligned_access (machine_mode, unsigned int)
1685 {
1686   return STRICT_ALIGNMENT;
1687 }
1688
1689 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE.  */
1690
1691 HOST_WIDE_INT
1692 default_estimated_poly_value (poly_int64 x)
1693 {
1694   return x.coeffs[0];
1695 }
1696
1697 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1698    behavior.  SPEED_P is true if we are compiling for speed.  */
1699
1700 unsigned int
1701 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED)
1702 {
1703   unsigned int move_ratio;
1704 #ifdef MOVE_RATIO
1705   move_ratio = (unsigned int) MOVE_RATIO (speed_p);
1706 #else
1707 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1708   move_ratio = 2;
1709 #else /* No movmem patterns, pick a default.  */
1710   move_ratio = ((speed_p) ? 15 : 3);
1711 #endif
1712 #endif
1713   return move_ratio;
1714 }
1715
1716 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1717    used; return FALSE if the movmem/setmem optab should be expanded, or
1718    a call to memcpy emitted.  */
1719
1720 bool
1721 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
1722                                         unsigned int alignment,
1723                                         enum by_pieces_operation op,
1724                                         bool speed_p)
1725 {
1726   unsigned int max_size = 0;
1727   unsigned int ratio = 0;
1728
1729   switch (op)
1730     {
1731     case CLEAR_BY_PIECES:
1732       max_size = STORE_MAX_PIECES;
1733       ratio = CLEAR_RATIO (speed_p);
1734       break;
1735     case MOVE_BY_PIECES:
1736       max_size = MOVE_MAX_PIECES;
1737       ratio = get_move_ratio (speed_p);
1738       break;
1739     case SET_BY_PIECES:
1740       max_size = STORE_MAX_PIECES;
1741       ratio = SET_RATIO (speed_p);
1742       break;
1743     case STORE_BY_PIECES:
1744       max_size = STORE_MAX_PIECES;
1745       ratio = get_move_ratio (speed_p);
1746       break;
1747     case COMPARE_BY_PIECES:
1748       max_size = COMPARE_MAX_PIECES;
1749       /* Pick a likely default, just as in get_move_ratio.  */
1750       ratio = speed_p ? 15 : 3;
1751       break;
1752     }
1753
1754   return by_pieces_ninsns (size, alignment, max_size + 1, op) < ratio;
1755 }
1756
1757 /* This hook controls code generation for expanding a memcmp operation by
1758    pieces.  Return 1 for the normal pattern of compare/jump after each pair
1759    of loads, or a higher number to reduce the number of branches.  */
1760
1761 int
1762 default_compare_by_pieces_branch_ratio (machine_mode)
1763 {
1764   return 1;
1765 }
1766
1767 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1768    entry.  If RECORD_P is true and the target supports named sections,
1769    the location of the NOPs will be recorded in a special object section
1770    called "__patchable_function_entries".  This routine may be called
1771    twice per function to put NOPs before and after the function
1772    entry.  */
1773
1774 void
1775 default_print_patchable_function_entry (FILE *file,
1776                                         unsigned HOST_WIDE_INT patch_area_size,
1777                                         bool record_p)
1778 {
1779   const char *nop_templ = 0;
1780   int code_num;
1781   rtx_insn *my_nop = make_insn_raw (gen_nop ());
1782
1783   /* We use the template alone, relying on the (currently sane) assumption
1784      that the NOP template does not have variable operands.  */
1785   code_num = recog_memoized (my_nop);
1786   nop_templ = get_insn_template (code_num, my_nop);
1787
1788   if (record_p && targetm_common.have_named_sections)
1789     {
1790       char buf[256];
1791       static int patch_area_number;
1792       section *previous_section = in_section;
1793
1794       patch_area_number++;
1795       ASM_GENERATE_INTERNAL_LABEL (buf, "LPFE", patch_area_number);
1796
1797       switch_to_section (get_section ("__patchable_function_entries",
1798                                       0, NULL));
1799       fputs (integer_asm_op (POINTER_SIZE_UNITS, false), file);
1800       assemble_name_raw (file, buf);
1801       fputc ('\n', file);
1802
1803       switch_to_section (previous_section);
1804       ASM_OUTPUT_LABEL (file, buf);
1805     }
1806
1807   unsigned i;
1808   for (i = 0; i < patch_area_size; ++i)
1809     fprintf (file, "\t%s\n", nop_templ);
1810 }
1811
1812 bool
1813 default_profile_before_prologue (void)
1814 {
1815 #ifdef PROFILE_BEFORE_PROLOGUE
1816   return true;
1817 #else
1818   return false;
1819 #endif
1820 }
1821
1822 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS.  */
1823
1824 reg_class_t
1825 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1826                                 reg_class_t rclass)
1827 {
1828 #ifdef PREFERRED_RELOAD_CLASS
1829   return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1830 #else
1831   return rclass;
1832 #endif
1833 }
1834
1835 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS.  */
1836
1837 reg_class_t
1838 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1839                                        reg_class_t rclass)
1840 {
1841   return rclass;
1842 }
1843
1844 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS.  */
1845 reg_class_t
1846 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1847 {
1848   return NO_REGS;
1849 }
1850
1851 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P.  */
1852
1853 bool
1854 default_class_likely_spilled_p (reg_class_t rclass)
1855 {
1856   return (reg_class_size[(int) rclass] == 1);
1857 }
1858
1859 /* The default implementation of TARGET_CLASS_MAX_NREGS.  */
1860
1861 unsigned char
1862 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1863                          machine_mode mode ATTRIBUTE_UNUSED)
1864 {
1865 #ifdef CLASS_MAX_NREGS
1866   return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass,
1867                                           MACRO_MODE (mode));
1868 #else
1869   /* Targets with variable-sized modes must provide their own definition
1870      of this hook.  */
1871   unsigned int size = GET_MODE_SIZE (mode).to_constant ();
1872   return (size + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
1873 #endif
1874 }
1875
1876 /* Determine the debugging unwind mechanism for the target.  */
1877
1878 enum unwind_info_type
1879 default_debug_unwind_info (void)
1880 {
1881   /* If the target wants to force the use of dwarf2 unwind info, let it.  */
1882   /* ??? Change all users to the hook, then poison this.  */
1883 #ifdef DWARF2_FRAME_INFO
1884   if (DWARF2_FRAME_INFO)
1885     return UI_DWARF2;
1886 #endif
1887
1888   /* Otherwise, only turn it on if dwarf2 debugging is enabled.  */
1889 #ifdef DWARF2_DEBUGGING_INFO
1890   if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1891     return UI_DWARF2;
1892 #endif
1893
1894   return UI_NONE;
1895 }
1896
1897 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1898    must define this hook.  */
1899
1900 unsigned int
1901 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1902 {
1903   gcc_unreachable ();
1904 }
1905
1906 /* Determine the correct mode for a Dwarf frame register that represents
1907    register REGNO.  */
1908
1909 machine_mode
1910 default_dwarf_frame_reg_mode (int regno)
1911 {
1912   machine_mode save_mode = reg_raw_mode[regno];
1913
1914   if (targetm.hard_regno_call_part_clobbered (regno, save_mode))
1915     save_mode = choose_hard_reg_mode (regno, 1, true);
1916   return save_mode;
1917 }
1918
1919 /* To be used by targets where reg_raw_mode doesn't return the right
1920    mode for registers used in apply_builtin_return and apply_builtin_arg.  */
1921
1922 fixed_size_mode
1923 default_get_reg_raw_mode (int regno)
1924 {
1925   /* Targets must override this hook if the underlying register is
1926      variable-sized.  */
1927   return as_a <fixed_size_mode> (reg_raw_mode[regno]);
1928 }
1929
1930 /* Return true if a leaf function should stay leaf even with profiling
1931    enabled.  */
1932
1933 bool
1934 default_keep_leaf_when_profiled ()
1935 {
1936   return false;
1937 }
1938
1939 /* Return true if the state of option OPTION should be stored in PCH files
1940    and checked by default_pch_valid_p.  Store the option's current state
1941    in STATE if so.  */
1942
1943 static inline bool
1944 option_affects_pch_p (int option, struct cl_option_state *state)
1945 {
1946   if ((cl_options[option].flags & CL_TARGET) == 0)
1947     return false;
1948   if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
1949     return false;
1950   if (option_flag_var (option, &global_options) == &target_flags)
1951     if (targetm.check_pch_target_flags)
1952       return false;
1953   return get_option_state (&global_options, option, state);
1954 }
1955
1956 /* Default version of get_pch_validity.
1957    By default, every flag difference is fatal; that will be mostly right for
1958    most targets, but completely right for very few.  */
1959
1960 void *
1961 default_get_pch_validity (size_t *sz)
1962 {
1963   struct cl_option_state state;
1964   size_t i;
1965   char *result, *r;
1966
1967   *sz = 2;
1968   if (targetm.check_pch_target_flags)
1969     *sz += sizeof (target_flags);
1970   for (i = 0; i < cl_options_count; i++)
1971     if (option_affects_pch_p (i, &state))
1972       *sz += state.size;
1973
1974   result = r = XNEWVEC (char, *sz);
1975   r[0] = flag_pic;
1976   r[1] = flag_pie;
1977   r += 2;
1978   if (targetm.check_pch_target_flags)
1979     {
1980       memcpy (r, &target_flags, sizeof (target_flags));
1981       r += sizeof (target_flags);
1982     }
1983
1984   for (i = 0; i < cl_options_count; i++)
1985     if (option_affects_pch_p (i, &state))
1986       {
1987         memcpy (r, state.data, state.size);
1988         r += state.size;
1989       }
1990
1991   return result;
1992 }
1993
1994 /* Return a message which says that a PCH file was created with a different
1995    setting of OPTION.  */
1996
1997 static const char *
1998 pch_option_mismatch (const char *option)
1999 {
2000   return xasprintf (_("created and used with differing settings of '%s'"),
2001                     option);
2002 }
2003
2004 /* Default version of pch_valid_p.  */
2005
2006 const char *
2007 default_pch_valid_p (const void *data_p, size_t len)
2008 {
2009   struct cl_option_state state;
2010   const char *data = (const char *)data_p;
2011   size_t i;
2012
2013   /* -fpic and -fpie also usually make a PCH invalid.  */
2014   if (data[0] != flag_pic)
2015     return _("created and used with different settings of -fpic");
2016   if (data[1] != flag_pie)
2017     return _("created and used with different settings of -fpie");
2018   data += 2;
2019
2020   /* Check target_flags.  */
2021   if (targetm.check_pch_target_flags)
2022     {
2023       int tf;
2024       const char *r;
2025
2026       memcpy (&tf, data, sizeof (target_flags));
2027       data += sizeof (target_flags);
2028       len -= sizeof (target_flags);
2029       r = targetm.check_pch_target_flags (tf);
2030       if (r != NULL)
2031         return r;
2032     }
2033
2034   for (i = 0; i < cl_options_count; i++)
2035     if (option_affects_pch_p (i, &state))
2036       {
2037         if (memcmp (data, state.data, state.size) != 0)
2038           return pch_option_mismatch (cl_options[i].opt_text);
2039         data += state.size;
2040         len -= state.size;
2041       }
2042
2043   return NULL;
2044 }
2045
2046 /* Default version of cstore_mode.  */
2047
2048 scalar_int_mode
2049 default_cstore_mode (enum insn_code icode)
2050 {
2051   return as_a <scalar_int_mode> (insn_data[(int) icode].operand[0].mode);
2052 }
2053
2054 /* Default version of member_type_forces_blk.  */
2055
2056 bool
2057 default_member_type_forces_blk (const_tree, machine_mode)
2058 {
2059   return false;
2060 }
2061
2062 rtx
2063 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
2064                              rtx ptr ATTRIBUTE_UNUSED,
2065                              rtx bnd ATTRIBUTE_UNUSED)
2066 {
2067   gcc_unreachable ();
2068 }
2069
2070 void
2071 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
2072                               rtx addr ATTRIBUTE_UNUSED,
2073                               rtx bounds ATTRIBUTE_UNUSED,
2074                               rtx to ATTRIBUTE_UNUSED)
2075 {
2076   gcc_unreachable ();
2077 }
2078
2079 rtx
2080 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
2081 {
2082   gcc_unreachable ();
2083 }
2084
2085 void
2086 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
2087                                rtx bounds ATTRIBUTE_UNUSED)
2088 {
2089   gcc_unreachable ();
2090 }
2091
2092 /* Default version of canonicalize_comparison.  */
2093
2094 void
2095 default_canonicalize_comparison (int *, rtx *, rtx *, bool)
2096 {
2097 }
2098
2099 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV.  */
2100
2101 void
2102 default_atomic_assign_expand_fenv (tree *, tree *, tree *)
2103 {
2104 }
2105
2106 #ifndef PAD_VARARGS_DOWN
2107 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2108 #endif
2109
2110 /* Build an indirect-ref expression over the given TREE, which represents a
2111    piece of a va_arg() expansion.  */
2112 tree
2113 build_va_arg_indirect_ref (tree addr)
2114 {
2115   addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr);
2116   return addr;
2117 }
2118
2119 /* The "standard" implementation of va_arg: read the value from the
2120    current (padded) address and increment by the (padded) size.  */
2121
2122 tree
2123 std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
2124                           gimple_seq *post_p)
2125 {
2126   tree addr, t, type_size, rounded_size, valist_tmp;
2127   unsigned HOST_WIDE_INT align, boundary;
2128   bool indirect;
2129
2130   /* All of the alignment and movement below is for args-grow-up machines.
2131      As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2132      implement their own specialized gimplify_va_arg_expr routines.  */
2133   if (ARGS_GROW_DOWNWARD)
2134     gcc_unreachable ();
2135
2136   indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false);
2137   if (indirect)
2138     type = build_pointer_type (type);
2139
2140   align = PARM_BOUNDARY / BITS_PER_UNIT;
2141   boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
2142
2143   /* When we align parameter on stack for caller, if the parameter
2144      alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2145      aligned at MAX_SUPPORTED_STACK_ALIGNMENT.  We will match callee
2146      here with caller.  */
2147   if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
2148     boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
2149
2150   boundary /= BITS_PER_UNIT;
2151
2152   /* Hoist the valist value into a temporary for the moment.  */
2153   valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
2154
2155   /* va_list pointer is aligned to PARM_BOUNDARY.  If argument actually
2156      requires greater alignment, we must perform dynamic alignment.  */
2157   if (boundary > align
2158       && !TYPE_EMPTY_P (type)
2159       && !integer_zerop (TYPE_SIZE (type)))
2160     {
2161       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2162                   fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
2163       gimplify_and_add (t, pre_p);
2164
2165       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2166                   fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
2167                                valist_tmp,
2168                                build_int_cst (TREE_TYPE (valist), -boundary)));
2169       gimplify_and_add (t, pre_p);
2170     }
2171   else
2172     boundary = align;
2173
2174   /* If the actual alignment is less than the alignment of the type,
2175      adjust the type accordingly so that we don't assume strict alignment
2176      when dereferencing the pointer.  */
2177   boundary *= BITS_PER_UNIT;
2178   if (boundary < TYPE_ALIGN (type))
2179     {
2180       type = build_variant_type_copy (type);
2181       SET_TYPE_ALIGN (type, boundary);
2182     }
2183
2184   /* Compute the rounded size of the type.  */
2185   type_size = arg_size_in_bytes (type);
2186   rounded_size = round_up (type_size, align);
2187
2188   /* Reduce rounded_size so it's sharable with the postqueue.  */
2189   gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
2190
2191   /* Get AP.  */
2192   addr = valist_tmp;
2193   if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
2194     {
2195       /* Small args are padded downward.  */
2196       t = fold_build2_loc (input_location, GT_EXPR, sizetype,
2197                        rounded_size, size_int (align));
2198       t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
2199                        size_binop (MINUS_EXPR, rounded_size, type_size));
2200       addr = fold_build_pointer_plus (addr, t);
2201     }
2202
2203   /* Compute new value for AP.  */
2204   t = fold_build_pointer_plus (valist_tmp, rounded_size);
2205   t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
2206   gimplify_and_add (t, pre_p);
2207
2208   addr = fold_convert (build_pointer_type (type), addr);
2209
2210   if (indirect)
2211     addr = build_va_arg_indirect_ref (addr);
2212
2213   return build_va_arg_indirect_ref (addr);
2214 }
2215
2216 tree
2217 default_chkp_bound_type (void)
2218 {
2219   tree res = make_node (POINTER_BOUNDS_TYPE);
2220   TYPE_PRECISION (res) = TYPE_PRECISION (size_type_node) * 2;
2221   TYPE_NAME (res) = get_identifier ("__bounds_type");
2222   SET_TYPE_MODE (res, targetm.chkp_bound_mode ());
2223   layout_type (res);
2224   return res;
2225 }
2226
2227 machine_mode
2228 default_chkp_bound_mode (void)
2229 {
2230   return VOIDmode;
2231 }
2232
2233 tree
2234 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED)
2235 {
2236   return NULL_TREE;
2237 }
2238
2239 rtx
2240 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED,
2241                                     const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
2242                                     bool outgoing ATTRIBUTE_UNUSED)
2243 {
2244   gcc_unreachable ();
2245 }
2246
2247 tree
2248 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED,
2249                                    HOST_WIDE_INT ub ATTRIBUTE_UNUSED)
2250 {
2251   return NULL_TREE;
2252 }
2253
2254 int
2255 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED,
2256                                 tree lb ATTRIBUTE_UNUSED,
2257                                 tree ub ATTRIBUTE_UNUSED,
2258                                 tree *stmts ATTRIBUTE_UNUSED)
2259 {
2260   return 0;
2261 }
2262
2263 void
2264 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
2265                                       machine_mode mode ATTRIBUTE_UNUSED,
2266                                       tree type ATTRIBUTE_UNUSED,
2267                                       int *pretend_arg_size ATTRIBUTE_UNUSED,
2268                                       int second_time ATTRIBUTE_UNUSED)
2269 {
2270 }
2271
2272 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2273    not support nested low-overhead loops.  */
2274
2275 bool
2276 can_use_doloop_if_innermost (const widest_int &, const widest_int &,
2277                              unsigned int loop_depth, bool)
2278 {
2279   return loop_depth == 1;
2280 }
2281
2282 /* Default implementation of TARGET_OPTAB_SUPPORTED_P.  */
2283
2284 bool
2285 default_optab_supported_p (int, machine_mode, machine_mode, optimization_type)
2286 {
2287   return true;
2288 }
2289
2290 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST.  */
2291
2292 unsigned int
2293 default_max_noce_ifcvt_seq_cost (edge e)
2294 {
2295   bool predictable_p = predictable_edge_p (e);
2296
2297   enum compiler_param param
2298     = (predictable_p
2299        ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2300        : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST);
2301
2302   /* If we have a parameter set, use that, otherwise take a guess using
2303      BRANCH_COST.  */
2304   if (global_options_set.x_param_values[param])
2305     return PARAM_VALUE (param);
2306   else
2307     return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (3);
2308 }
2309
2310 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION.  */
2311
2312 unsigned int
2313 default_min_arithmetic_precision (void)
2314 {
2315   return WORD_REGISTER_OPERATIONS ? BITS_PER_WORD : BITS_PER_UNIT;
2316 }
2317
2318 /* Default implementation of TARGET_C_EXCESS_PRECISION.  */
2319
2320 enum flt_eval_method
2321 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED)
2322 {
2323   return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
2324 }
2325
2326 bool
2327 default_stack_clash_protection_final_dynamic_probe (rtx residual ATTRIBUTE_UNUSED)
2328 {
2329   return 0;
2330 }
2331
2332 /* The default implementation of TARGET_EARLY_REMAT_MODES.  */
2333
2334 void
2335 default_select_early_remat_modes (sbitmap)
2336 {
2337 }
2338
2339 #include "gt-targhooks.h"