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, address diff vectors are generated
1200 for jump tables when flag_pic is true.  */
1201
1202 bool
1203 default_generate_pic_addr_diff_vec (void)
1204 {
1205   return flag_pic;
1206 }
1207
1208 /* By default, do no modification. */
1209 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
1210                                          tree id)
1211 {
1212    return id;
1213 }
1214
1215 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT.  */
1216
1217 HOST_WIDE_INT
1218 default_static_rtx_alignment (machine_mode mode)
1219 {
1220   return GET_MODE_ALIGNMENT (mode);
1221 }
1222
1223 /* The default implementation of TARGET_CONSTANT_ALIGNMENT.  */
1224
1225 HOST_WIDE_INT
1226 default_constant_alignment (const_tree, HOST_WIDE_INT align)
1227 {
1228   return align;
1229 }
1230
1231 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1232    to at least BITS_PER_WORD but otherwise makes no changes.  */
1233
1234 HOST_WIDE_INT
1235 constant_alignment_word_strings (const_tree exp, HOST_WIDE_INT align)
1236 {
1237   if (TREE_CODE (exp) == STRING_CST)
1238     return MAX (align, BITS_PER_WORD);
1239   return align;
1240 }
1241
1242 /* Default to natural alignment for vector types.  */
1243 HOST_WIDE_INT
1244 default_vector_alignment (const_tree type)
1245 {
1246   HOST_WIDE_INT align = tree_to_shwi (TYPE_SIZE (type));
1247   if (align > MAX_OFILE_ALIGNMENT)
1248     align = MAX_OFILE_ALIGNMENT;
1249   return align;
1250 }
1251
1252 /* The default implementation of
1253    TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT.  */
1254
1255 HOST_WIDE_INT
1256 default_preferred_vector_alignment (const_tree type)
1257 {
1258   return TYPE_ALIGN (type);
1259 }
1260
1261 /* By default assume vectors of element TYPE require a multiple of the natural
1262    alignment of TYPE.  TYPE is naturally aligned if IS_PACKED is false.  */
1263 bool
1264 default_builtin_vector_alignment_reachable (const_tree /*type*/, bool is_packed)
1265 {
1266   return ! is_packed;
1267 }
1268
1269 /* By default, assume that a target supports any factor of misalignment
1270    memory access if it supports movmisalign patten.
1271    is_packed is true if the memory access is defined in a packed struct.  */
1272 bool
1273 default_builtin_support_vector_misalignment (machine_mode mode,
1274                                              const_tree type
1275                                              ATTRIBUTE_UNUSED,
1276                                              int misalignment
1277                                              ATTRIBUTE_UNUSED,
1278                                              bool is_packed
1279                                              ATTRIBUTE_UNUSED)
1280 {
1281   if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1282     return true;
1283   return false;
1284 }
1285
1286 /* By default, only attempt to parallelize bitwise operations, and
1287    possibly adds/subtracts using bit-twiddling.  */
1288
1289 machine_mode
1290 default_preferred_simd_mode (scalar_mode)
1291 {
1292   return word_mode;
1293 }
1294
1295 /* By default do not split reductions further.  */
1296
1297 machine_mode
1298 default_split_reduction (machine_mode mode)
1299 {
1300   return mode;
1301 }
1302
1303 /* By default only the size derived from the preferred vector mode
1304    is tried.  */
1305
1306 void
1307 default_autovectorize_vector_sizes (vector_sizes *)
1308 {
1309 }
1310
1311 /* By default a vector of integers is used as a mask.  */
1312
1313 opt_machine_mode
1314 default_get_mask_mode (poly_uint64 nunits, poly_uint64 vector_size)
1315 {
1316   unsigned int elem_size = vector_element_size (vector_size, nunits);
1317   scalar_int_mode elem_mode
1318     = smallest_int_mode_for_size (elem_size * BITS_PER_UNIT);
1319   machine_mode vector_mode;
1320
1321   gcc_assert (known_eq (elem_size * nunits, vector_size));
1322
1323   if (mode_for_vector (elem_mode, nunits).exists (&vector_mode)
1324       && VECTOR_MODE_P (vector_mode)
1325       && targetm.vector_mode_supported_p (vector_mode))
1326     return vector_mode;
1327
1328   return opt_machine_mode ();
1329 }
1330
1331 /* By default consider masked stores to be expensive.  */
1332
1333 bool
1334 default_empty_mask_is_expensive (unsigned ifn)
1335 {
1336   return ifn == IFN_MASK_STORE;
1337 }
1338
1339 /* By default, the cost model accumulates three separate costs (prologue,
1340    loop body, and epilogue) for a vectorized loop or block.  So allocate an
1341    array of three unsigned ints, set it to zero, and return its address.  */
1342
1343 void *
1344 default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED)
1345 {
1346   unsigned *cost = XNEWVEC (unsigned, 3);
1347   cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0;
1348   return cost;
1349 }
1350
1351 /* By default, the cost model looks up the cost of the given statement
1352    kind and mode, multiplies it by the occurrence count, accumulates
1353    it into the cost specified by WHERE, and returns the cost added.  */
1354
1355 unsigned
1356 default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
1357                        struct _stmt_vec_info *stmt_info, int misalign,
1358                        enum vect_cost_model_location where)
1359 {
1360   unsigned *cost = (unsigned *) data;
1361   unsigned retval = 0;
1362
1363   tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE;
1364   int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype,
1365                                                                 misalign);
1366    /* Statements in an inner loop relative to the loop being
1367       vectorized are weighted more heavily.  The value here is
1368       arbitrary and could potentially be improved with analysis.  */
1369   if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info))
1370     count *= 50;  /* FIXME.  */
1371
1372   retval = (unsigned) (count * stmt_cost);
1373   cost[where] += retval;
1374
1375   return retval;
1376 }
1377
1378 /* By default, the cost model just returns the accumulated costs.  */
1379
1380 void
1381 default_finish_cost (void *data, unsigned *prologue_cost,
1382                      unsigned *body_cost, unsigned *epilogue_cost)
1383 {
1384   unsigned *cost = (unsigned *) data;
1385   *prologue_cost = cost[vect_prologue];
1386   *body_cost     = cost[vect_body];
1387   *epilogue_cost = cost[vect_epilogue];
1388 }
1389
1390 /* Free the cost data.  */
1391
1392 void
1393 default_destroy_cost_data (void *data)
1394 {
1395   free (data);
1396 }
1397
1398 /* Determine whether or not a pointer mode is valid. Assume defaults
1399    of ptr_mode or Pmode - can be overridden.  */
1400 bool
1401 default_valid_pointer_mode (scalar_int_mode mode)
1402 {
1403   return (mode == ptr_mode || mode == Pmode);
1404 }
1405
1406 /* Determine whether the memory reference specified by REF may alias
1407    the C libraries errno location.  */
1408 bool
1409 default_ref_may_alias_errno (ao_ref *ref)
1410 {
1411   tree base = ao_ref_base (ref);
1412   /* The default implementation assumes the errno location is
1413      a declaration of type int or is always accessed via a
1414      pointer to int.  We assume that accesses to errno are
1415      not deliberately obfuscated (even in conforming ways).  */
1416   if (TYPE_UNSIGNED (TREE_TYPE (base))
1417       || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1418     return false;
1419   /* The default implementation assumes an errno location
1420      declaration is never defined in the current compilation unit.  */
1421   if (DECL_P (base)
1422       && !TREE_STATIC (base))
1423     return true;
1424   else if (TREE_CODE (base) == MEM_REF
1425            && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1426     {
1427       struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1428       return !pi || pi->pt.anything || pi->pt.nonlocal;
1429     }
1430   return false;
1431 }
1432
1433 /* Return the mode for a pointer to a given ADDRSPACE,
1434    defaulting to ptr_mode for all address spaces.  */
1435
1436 scalar_int_mode
1437 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1438 {
1439   return ptr_mode;
1440 }
1441
1442 /* Return the mode for an address in a given ADDRSPACE,
1443    defaulting to Pmode for all address spaces.  */
1444
1445 scalar_int_mode
1446 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1447 {
1448   return Pmode;
1449 }
1450
1451 /* Named address space version of valid_pointer_mode.
1452    To match the above, the same modes apply to all address spaces.  */
1453
1454 bool
1455 default_addr_space_valid_pointer_mode (scalar_int_mode mode,
1456                                        addr_space_t as ATTRIBUTE_UNUSED)
1457 {
1458   return targetm.valid_pointer_mode (mode);
1459 }
1460
1461 /* Some places still assume that all pointer or address modes are the
1462    standard Pmode and ptr_mode.  These optimizations become invalid if
1463    the target actually supports multiple different modes.  For now,
1464    we disable such optimizations on such targets, using this function.  */
1465
1466 bool
1467 target_default_pointer_address_modes_p (void)
1468 {
1469   if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1470     return false;
1471   if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1472     return false;
1473
1474   return true;
1475 }
1476
1477 /* Named address space version of legitimate_address_p.
1478    By default, all address spaces have the same form.  */
1479
1480 bool
1481 default_addr_space_legitimate_address_p (machine_mode mode, rtx mem,
1482                                          bool strict,
1483                                          addr_space_t as ATTRIBUTE_UNUSED)
1484 {
1485   return targetm.legitimate_address_p (mode, mem, strict);
1486 }
1487
1488 /* Named address space version of LEGITIMIZE_ADDRESS.
1489    By default, all address spaces have the same form.  */
1490
1491 rtx
1492 default_addr_space_legitimize_address (rtx x, rtx oldx, machine_mode mode,
1493                                        addr_space_t as ATTRIBUTE_UNUSED)
1494 {
1495   return targetm.legitimize_address (x, oldx, mode);
1496 }
1497
1498 /* The default hook for determining if one named address space is a subset of
1499    another and to return which address space to use as the common address
1500    space.  */
1501
1502 bool
1503 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1504 {
1505   return (subset == superset);
1506 }
1507
1508 /* The default hook for determining if 0 within a named address
1509    space is a valid address.  */
1510
1511 bool
1512 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED)
1513 {
1514   return false;
1515 }
1516
1517 /* The default hook for debugging the address space is to return the
1518    address space number to indicate DW_AT_address_class.  */
1519 int
1520 default_addr_space_debug (addr_space_t as)
1521 {
1522   return as;
1523 }
1524
1525 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1526    Don't complain about any address space.  */
1527
1528 void
1529 default_addr_space_diagnose_usage (addr_space_t, location_t)
1530 {
1531 }
1532
1533
1534 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1535    called for targets with only a generic address space.  */
1536
1537 rtx
1538 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1539                             tree from_type ATTRIBUTE_UNUSED,
1540                             tree to_type ATTRIBUTE_UNUSED)
1541 {
1542   gcc_unreachable ();
1543 }
1544
1545 /* The defualt implementation of TARGET_HARD_REGNO_NREGS.  */
1546
1547 unsigned int
1548 default_hard_regno_nregs (unsigned int, machine_mode mode)
1549 {
1550   /* Targets with variable-sized modes must provide their own definition
1551      of this hook.  */
1552   return CEIL (GET_MODE_SIZE (mode).to_constant (), UNITS_PER_WORD);
1553 }
1554
1555 bool
1556 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1557 {
1558   return true;
1559 }
1560
1561 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P.  */
1562
1563 bool
1564 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED,
1565                                   addr_space_t addrspace ATTRIBUTE_UNUSED)
1566 {
1567   return false;
1568 }
1569
1570 bool
1571 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1572                                          tree ARG_UNUSED (name),
1573                                          tree ARG_UNUSED (args),
1574                                          int ARG_UNUSED (flags))
1575 {
1576   warning (OPT_Wattributes,
1577            "target attribute is not supported on this machine");
1578
1579   return false;
1580 }
1581
1582 bool
1583 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1584                                     tree ARG_UNUSED (pop_target))
1585 {
1586   /* If args is NULL the caller is handle_pragma_pop_options ().  In that case,
1587      emit no warning because "#pragma GCC pop_target" is valid on targets that
1588      do not have the "target" pragma.  */
1589   if (args)
1590     warning (OPT_Wpragmas,
1591              "#pragma GCC target is not supported for this machine");
1592
1593   return false;
1594 }
1595
1596 bool
1597 default_target_can_inline_p (tree caller, tree callee)
1598 {
1599   tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1600   tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1601   if (! callee_opts)
1602     callee_opts = target_option_default_node;
1603   if (! caller_opts)
1604     caller_opts = target_option_default_node;
1605
1606   /* If both caller and callee have attributes, assume that if the
1607      pointer is different, the two functions have different target
1608      options since build_target_option_node uses a hash table for the
1609      options.  */
1610   return callee_opts == caller_opts;
1611 }
1612
1613 /* If the machine does not have a case insn that compares the bounds,
1614    this means extra overhead for dispatch tables, which raises the
1615    threshold for using them.  */
1616
1617 unsigned int
1618 default_case_values_threshold (void)
1619 {
1620   return (targetm.have_casesi () ? 4 : 5);
1621 }
1622
1623 bool
1624 default_have_conditional_execution (void)
1625 {
1626   return HAVE_conditional_execution;
1627 }
1628
1629 /* By default we assume that c99 functions are present at the runtime,
1630    but sincos is not.  */
1631 bool
1632 default_libc_has_function (enum function_class fn_class)
1633 {
1634   if (fn_class == function_c94
1635       || fn_class == function_c99_misc
1636       || fn_class == function_c99_math_complex)
1637     return true;
1638
1639   return false;
1640 }
1641
1642 bool
1643 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1644 {
1645   return true;
1646 }
1647
1648 bool
1649 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1650 {
1651   return false;
1652 }
1653
1654 tree
1655 default_builtin_tm_load_store (tree ARG_UNUSED (type))
1656 {
1657   return NULL_TREE;
1658 }
1659
1660 /* Compute cost of moving registers to/from memory.  */
1661
1662 int
1663 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1664                           reg_class_t rclass ATTRIBUTE_UNUSED,
1665                           bool in ATTRIBUTE_UNUSED)
1666 {
1667 #ifndef MEMORY_MOVE_COST
1668     return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1669 #else
1670     return MEMORY_MOVE_COST (MACRO_MODE (mode), (enum reg_class) rclass, in);
1671 #endif
1672 }
1673
1674 /* Compute cost of moving data from a register of class FROM to one of
1675    TO, using MODE.  */
1676
1677 int
1678 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1679                             reg_class_t from ATTRIBUTE_UNUSED,
1680                             reg_class_t to ATTRIBUTE_UNUSED)
1681 {
1682 #ifndef REGISTER_MOVE_COST
1683   return 2;
1684 #else
1685   return REGISTER_MOVE_COST (MACRO_MODE (mode),
1686                              (enum reg_class) from, (enum reg_class) to);
1687 #endif
1688 }
1689
1690 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS.  */
1691
1692 bool
1693 default_slow_unaligned_access (machine_mode, unsigned int)
1694 {
1695   return STRICT_ALIGNMENT;
1696 }
1697
1698 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE.  */
1699
1700 HOST_WIDE_INT
1701 default_estimated_poly_value (poly_int64 x)
1702 {
1703   return x.coeffs[0];
1704 }
1705
1706 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1707    behavior.  SPEED_P is true if we are compiling for speed.  */
1708
1709 unsigned int
1710 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED)
1711 {
1712   unsigned int move_ratio;
1713 #ifdef MOVE_RATIO
1714   move_ratio = (unsigned int) MOVE_RATIO (speed_p);
1715 #else
1716 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1717   move_ratio = 2;
1718 #else /* No movmem patterns, pick a default.  */
1719   move_ratio = ((speed_p) ? 15 : 3);
1720 #endif
1721 #endif
1722   return move_ratio;
1723 }
1724
1725 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1726    used; return FALSE if the movmem/setmem optab should be expanded, or
1727    a call to memcpy emitted.  */
1728
1729 bool
1730 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
1731                                         unsigned int alignment,
1732                                         enum by_pieces_operation op,
1733                                         bool speed_p)
1734 {
1735   unsigned int max_size = 0;
1736   unsigned int ratio = 0;
1737
1738   switch (op)
1739     {
1740     case CLEAR_BY_PIECES:
1741       max_size = STORE_MAX_PIECES;
1742       ratio = CLEAR_RATIO (speed_p);
1743       break;
1744     case MOVE_BY_PIECES:
1745       max_size = MOVE_MAX_PIECES;
1746       ratio = get_move_ratio (speed_p);
1747       break;
1748     case SET_BY_PIECES:
1749       max_size = STORE_MAX_PIECES;
1750       ratio = SET_RATIO (speed_p);
1751       break;
1752     case STORE_BY_PIECES:
1753       max_size = STORE_MAX_PIECES;
1754       ratio = get_move_ratio (speed_p);
1755       break;
1756     case COMPARE_BY_PIECES:
1757       max_size = COMPARE_MAX_PIECES;
1758       /* Pick a likely default, just as in get_move_ratio.  */
1759       ratio = speed_p ? 15 : 3;
1760       break;
1761     }
1762
1763   return by_pieces_ninsns (size, alignment, max_size + 1, op) < ratio;
1764 }
1765
1766 /* This hook controls code generation for expanding a memcmp operation by
1767    pieces.  Return 1 for the normal pattern of compare/jump after each pair
1768    of loads, or a higher number to reduce the number of branches.  */
1769
1770 int
1771 default_compare_by_pieces_branch_ratio (machine_mode)
1772 {
1773   return 1;
1774 }
1775
1776 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1777    entry.  If RECORD_P is true and the target supports named sections,
1778    the location of the NOPs will be recorded in a special object section
1779    called "__patchable_function_entries".  This routine may be called
1780    twice per function to put NOPs before and after the function
1781    entry.  */
1782
1783 void
1784 default_print_patchable_function_entry (FILE *file,
1785                                         unsigned HOST_WIDE_INT patch_area_size,
1786                                         bool record_p)
1787 {
1788   const char *nop_templ = 0;
1789   int code_num;
1790   rtx_insn *my_nop = make_insn_raw (gen_nop ());
1791
1792   /* We use the template alone, relying on the (currently sane) assumption
1793      that the NOP template does not have variable operands.  */
1794   code_num = recog_memoized (my_nop);
1795   nop_templ = get_insn_template (code_num, my_nop);
1796
1797   if (record_p && targetm_common.have_named_sections)
1798     {
1799       char buf[256];
1800       static int patch_area_number;
1801       section *previous_section = in_section;
1802
1803       patch_area_number++;
1804       ASM_GENERATE_INTERNAL_LABEL (buf, "LPFE", patch_area_number);
1805
1806       switch_to_section (get_section ("__patchable_function_entries",
1807                                       0, NULL));
1808       fputs (integer_asm_op (POINTER_SIZE_UNITS, false), file);
1809       assemble_name_raw (file, buf);
1810       fputc ('\n', file);
1811
1812       switch_to_section (previous_section);
1813       ASM_OUTPUT_LABEL (file, buf);
1814     }
1815
1816   unsigned i;
1817   for (i = 0; i < patch_area_size; ++i)
1818     fprintf (file, "\t%s\n", nop_templ);
1819 }
1820
1821 bool
1822 default_profile_before_prologue (void)
1823 {
1824 #ifdef PROFILE_BEFORE_PROLOGUE
1825   return true;
1826 #else
1827   return false;
1828 #endif
1829 }
1830
1831 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS.  */
1832
1833 reg_class_t
1834 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1835                                 reg_class_t rclass)
1836 {
1837 #ifdef PREFERRED_RELOAD_CLASS
1838   return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1839 #else
1840   return rclass;
1841 #endif
1842 }
1843
1844 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS.  */
1845
1846 reg_class_t
1847 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1848                                        reg_class_t rclass)
1849 {
1850   return rclass;
1851 }
1852
1853 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS.  */
1854 reg_class_t
1855 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1856 {
1857   return NO_REGS;
1858 }
1859
1860 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P.  */
1861
1862 bool
1863 default_class_likely_spilled_p (reg_class_t rclass)
1864 {
1865   return (reg_class_size[(int) rclass] == 1);
1866 }
1867
1868 /* The default implementation of TARGET_CLASS_MAX_NREGS.  */
1869
1870 unsigned char
1871 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1872                          machine_mode mode ATTRIBUTE_UNUSED)
1873 {
1874 #ifdef CLASS_MAX_NREGS
1875   return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass,
1876                                           MACRO_MODE (mode));
1877 #else
1878   /* Targets with variable-sized modes must provide their own definition
1879      of this hook.  */
1880   unsigned int size = GET_MODE_SIZE (mode).to_constant ();
1881   return (size + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
1882 #endif
1883 }
1884
1885 /* Determine the debugging unwind mechanism for the target.  */
1886
1887 enum unwind_info_type
1888 default_debug_unwind_info (void)
1889 {
1890   /* If the target wants to force the use of dwarf2 unwind info, let it.  */
1891   /* ??? Change all users to the hook, then poison this.  */
1892 #ifdef DWARF2_FRAME_INFO
1893   if (DWARF2_FRAME_INFO)
1894     return UI_DWARF2;
1895 #endif
1896
1897   /* Otherwise, only turn it on if dwarf2 debugging is enabled.  */
1898 #ifdef DWARF2_DEBUGGING_INFO
1899   if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1900     return UI_DWARF2;
1901 #endif
1902
1903   return UI_NONE;
1904 }
1905
1906 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1907    must define this hook.  */
1908
1909 unsigned int
1910 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1911 {
1912   gcc_unreachable ();
1913 }
1914
1915 /* Determine the correct mode for a Dwarf frame register that represents
1916    register REGNO.  */
1917
1918 machine_mode
1919 default_dwarf_frame_reg_mode (int regno)
1920 {
1921   machine_mode save_mode = reg_raw_mode[regno];
1922
1923   if (targetm.hard_regno_call_part_clobbered (regno, save_mode))
1924     save_mode = choose_hard_reg_mode (regno, 1, true);
1925   return save_mode;
1926 }
1927
1928 /* To be used by targets where reg_raw_mode doesn't return the right
1929    mode for registers used in apply_builtin_return and apply_builtin_arg.  */
1930
1931 fixed_size_mode
1932 default_get_reg_raw_mode (int regno)
1933 {
1934   /* Targets must override this hook if the underlying register is
1935      variable-sized.  */
1936   return as_a <fixed_size_mode> (reg_raw_mode[regno]);
1937 }
1938
1939 /* Return true if a leaf function should stay leaf even with profiling
1940    enabled.  */
1941
1942 bool
1943 default_keep_leaf_when_profiled ()
1944 {
1945   return false;
1946 }
1947
1948 /* Return true if the state of option OPTION should be stored in PCH files
1949    and checked by default_pch_valid_p.  Store the option's current state
1950    in STATE if so.  */
1951
1952 static inline bool
1953 option_affects_pch_p (int option, struct cl_option_state *state)
1954 {
1955   if ((cl_options[option].flags & CL_TARGET) == 0)
1956     return false;
1957   if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
1958     return false;
1959   if (option_flag_var (option, &global_options) == &target_flags)
1960     if (targetm.check_pch_target_flags)
1961       return false;
1962   return get_option_state (&global_options, option, state);
1963 }
1964
1965 /* Default version of get_pch_validity.
1966    By default, every flag difference is fatal; that will be mostly right for
1967    most targets, but completely right for very few.  */
1968
1969 void *
1970 default_get_pch_validity (size_t *sz)
1971 {
1972   struct cl_option_state state;
1973   size_t i;
1974   char *result, *r;
1975
1976   *sz = 2;
1977   if (targetm.check_pch_target_flags)
1978     *sz += sizeof (target_flags);
1979   for (i = 0; i < cl_options_count; i++)
1980     if (option_affects_pch_p (i, &state))
1981       *sz += state.size;
1982
1983   result = r = XNEWVEC (char, *sz);
1984   r[0] = flag_pic;
1985   r[1] = flag_pie;
1986   r += 2;
1987   if (targetm.check_pch_target_flags)
1988     {
1989       memcpy (r, &target_flags, sizeof (target_flags));
1990       r += sizeof (target_flags);
1991     }
1992
1993   for (i = 0; i < cl_options_count; i++)
1994     if (option_affects_pch_p (i, &state))
1995       {
1996         memcpy (r, state.data, state.size);
1997         r += state.size;
1998       }
1999
2000   return result;
2001 }
2002
2003 /* Return a message which says that a PCH file was created with a different
2004    setting of OPTION.  */
2005
2006 static const char *
2007 pch_option_mismatch (const char *option)
2008 {
2009   return xasprintf (_("created and used with differing settings of '%s'"),
2010                     option);
2011 }
2012
2013 /* Default version of pch_valid_p.  */
2014
2015 const char *
2016 default_pch_valid_p (const void *data_p, size_t len)
2017 {
2018   struct cl_option_state state;
2019   const char *data = (const char *)data_p;
2020   size_t i;
2021
2022   /* -fpic and -fpie also usually make a PCH invalid.  */
2023   if (data[0] != flag_pic)
2024     return _("created and used with different settings of -fpic");
2025   if (data[1] != flag_pie)
2026     return _("created and used with different settings of -fpie");
2027   data += 2;
2028
2029   /* Check target_flags.  */
2030   if (targetm.check_pch_target_flags)
2031     {
2032       int tf;
2033       const char *r;
2034
2035       memcpy (&tf, data, sizeof (target_flags));
2036       data += sizeof (target_flags);
2037       len -= sizeof (target_flags);
2038       r = targetm.check_pch_target_flags (tf);
2039       if (r != NULL)
2040         return r;
2041     }
2042
2043   for (i = 0; i < cl_options_count; i++)
2044     if (option_affects_pch_p (i, &state))
2045       {
2046         if (memcmp (data, state.data, state.size) != 0)
2047           return pch_option_mismatch (cl_options[i].opt_text);
2048         data += state.size;
2049         len -= state.size;
2050       }
2051
2052   return NULL;
2053 }
2054
2055 /* Default version of cstore_mode.  */
2056
2057 scalar_int_mode
2058 default_cstore_mode (enum insn_code icode)
2059 {
2060   return as_a <scalar_int_mode> (insn_data[(int) icode].operand[0].mode);
2061 }
2062
2063 /* Default version of member_type_forces_blk.  */
2064
2065 bool
2066 default_member_type_forces_blk (const_tree, machine_mode)
2067 {
2068   return false;
2069 }
2070
2071 rtx
2072 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
2073                              rtx ptr ATTRIBUTE_UNUSED,
2074                              rtx bnd ATTRIBUTE_UNUSED)
2075 {
2076   gcc_unreachable ();
2077 }
2078
2079 void
2080 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
2081                               rtx addr ATTRIBUTE_UNUSED,
2082                               rtx bounds ATTRIBUTE_UNUSED,
2083                               rtx to ATTRIBUTE_UNUSED)
2084 {
2085   gcc_unreachable ();
2086 }
2087
2088 rtx
2089 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
2090 {
2091   gcc_unreachable ();
2092 }
2093
2094 void
2095 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
2096                                rtx bounds ATTRIBUTE_UNUSED)
2097 {
2098   gcc_unreachable ();
2099 }
2100
2101 /* Default version of canonicalize_comparison.  */
2102
2103 void
2104 default_canonicalize_comparison (int *, rtx *, rtx *, bool)
2105 {
2106 }
2107
2108 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV.  */
2109
2110 void
2111 default_atomic_assign_expand_fenv (tree *, tree *, tree *)
2112 {
2113 }
2114
2115 #ifndef PAD_VARARGS_DOWN
2116 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2117 #endif
2118
2119 /* Build an indirect-ref expression over the given TREE, which represents a
2120    piece of a va_arg() expansion.  */
2121 tree
2122 build_va_arg_indirect_ref (tree addr)
2123 {
2124   addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr);
2125   return addr;
2126 }
2127
2128 /* The "standard" implementation of va_arg: read the value from the
2129    current (padded) address and increment by the (padded) size.  */
2130
2131 tree
2132 std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
2133                           gimple_seq *post_p)
2134 {
2135   tree addr, t, type_size, rounded_size, valist_tmp;
2136   unsigned HOST_WIDE_INT align, boundary;
2137   bool indirect;
2138
2139   /* All of the alignment and movement below is for args-grow-up machines.
2140      As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2141      implement their own specialized gimplify_va_arg_expr routines.  */
2142   if (ARGS_GROW_DOWNWARD)
2143     gcc_unreachable ();
2144
2145   indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false);
2146   if (indirect)
2147     type = build_pointer_type (type);
2148
2149   align = PARM_BOUNDARY / BITS_PER_UNIT;
2150   boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
2151
2152   /* When we align parameter on stack for caller, if the parameter
2153      alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2154      aligned at MAX_SUPPORTED_STACK_ALIGNMENT.  We will match callee
2155      here with caller.  */
2156   if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
2157     boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
2158
2159   boundary /= BITS_PER_UNIT;
2160
2161   /* Hoist the valist value into a temporary for the moment.  */
2162   valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
2163
2164   /* va_list pointer is aligned to PARM_BOUNDARY.  If argument actually
2165      requires greater alignment, we must perform dynamic alignment.  */
2166   if (boundary > align
2167       && !TYPE_EMPTY_P (type)
2168       && !integer_zerop (TYPE_SIZE (type)))
2169     {
2170       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2171                   fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
2172       gimplify_and_add (t, pre_p);
2173
2174       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2175                   fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
2176                                valist_tmp,
2177                                build_int_cst (TREE_TYPE (valist), -boundary)));
2178       gimplify_and_add (t, pre_p);
2179     }
2180   else
2181     boundary = align;
2182
2183   /* If the actual alignment is less than the alignment of the type,
2184      adjust the type accordingly so that we don't assume strict alignment
2185      when dereferencing the pointer.  */
2186   boundary *= BITS_PER_UNIT;
2187   if (boundary < TYPE_ALIGN (type))
2188     {
2189       type = build_variant_type_copy (type);
2190       SET_TYPE_ALIGN (type, boundary);
2191     }
2192
2193   /* Compute the rounded size of the type.  */
2194   type_size = arg_size_in_bytes (type);
2195   rounded_size = round_up (type_size, align);
2196
2197   /* Reduce rounded_size so it's sharable with the postqueue.  */
2198   gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
2199
2200   /* Get AP.  */
2201   addr = valist_tmp;
2202   if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
2203     {
2204       /* Small args are padded downward.  */
2205       t = fold_build2_loc (input_location, GT_EXPR, sizetype,
2206                        rounded_size, size_int (align));
2207       t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
2208                        size_binop (MINUS_EXPR, rounded_size, type_size));
2209       addr = fold_build_pointer_plus (addr, t);
2210     }
2211
2212   /* Compute new value for AP.  */
2213   t = fold_build_pointer_plus (valist_tmp, rounded_size);
2214   t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
2215   gimplify_and_add (t, pre_p);
2216
2217   addr = fold_convert (build_pointer_type (type), addr);
2218
2219   if (indirect)
2220     addr = build_va_arg_indirect_ref (addr);
2221
2222   return build_va_arg_indirect_ref (addr);
2223 }
2224
2225 void
2226 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
2227                                       machine_mode mode ATTRIBUTE_UNUSED,
2228                                       tree type ATTRIBUTE_UNUSED,
2229                                       int *pretend_arg_size ATTRIBUTE_UNUSED,
2230                                       int second_time ATTRIBUTE_UNUSED)
2231 {
2232 }
2233
2234 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2235    not support nested low-overhead loops.  */
2236
2237 bool
2238 can_use_doloop_if_innermost (const widest_int &, const widest_int &,
2239                              unsigned int loop_depth, bool)
2240 {
2241   return loop_depth == 1;
2242 }
2243
2244 /* Default implementation of TARGET_OPTAB_SUPPORTED_P.  */
2245
2246 bool
2247 default_optab_supported_p (int, machine_mode, machine_mode, optimization_type)
2248 {
2249   return true;
2250 }
2251
2252 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST.  */
2253
2254 unsigned int
2255 default_max_noce_ifcvt_seq_cost (edge e)
2256 {
2257   bool predictable_p = predictable_edge_p (e);
2258
2259   enum compiler_param param
2260     = (predictable_p
2261        ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2262        : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST);
2263
2264   /* If we have a parameter set, use that, otherwise take a guess using
2265      BRANCH_COST.  */
2266   if (global_options_set.x_param_values[param])
2267     return PARAM_VALUE (param);
2268   else
2269     return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (3);
2270 }
2271
2272 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION.  */
2273
2274 unsigned int
2275 default_min_arithmetic_precision (void)
2276 {
2277   return WORD_REGISTER_OPERATIONS ? BITS_PER_WORD : BITS_PER_UNIT;
2278 }
2279
2280 /* Default implementation of TARGET_C_EXCESS_PRECISION.  */
2281
2282 enum flt_eval_method
2283 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED)
2284 {
2285   return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
2286 }
2287
2288 bool
2289 default_stack_clash_protection_final_dynamic_probe (rtx residual ATTRIBUTE_UNUSED)
2290 {
2291   return 0;
2292 }
2293
2294 /* The default implementation of TARGET_EARLY_REMAT_MODES.  */
2295
2296 void
2297 default_select_early_remat_modes (sbitmap)
2298 {
2299 }
2300
2301 #include "gt-targhooks.h"