gcc/targhooks.c

   1 /* Default target hook functions.
   2    Copyright (C) 2003-2017 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
  86 bool
  87 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED,
  88                               rtx addr ATTRIBUTE_UNUSED,
  89                               bool strict ATTRIBUTE_UNUSED)
  90 {
  91 #ifdef GO_IF_LEGITIMATE_ADDRESS
  92   /* Defer to the old implementation using a goto.  */
  93   if (strict)
  94     return strict_memory_address_p (mode, addr);
  95   else
  96     return memory_address_p (mode, addr);
  97 #else
  98   gcc_unreachable ();
  99 #endif
 100 }
 101
 102 void
 103 default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
 104 {
 105 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
 106   ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun);
 107 #endif
 108 }
 109
 110 int
 111 default_unspec_may_trap_p (const_rtx x, unsigned flags)
 112 {
 113   int i;
 114
 115   /* Any floating arithmetic may trap.  */
 116   if ((SCALAR_FLOAT_MODE_P (GET_MODE (x)) && flag_trapping_math))
 117     return 1;
 118
 119   for (i = 0; i < XVECLEN (x, 0); ++i)
 120     {
 121       if (may_trap_p_1 (XVECEXP (x, 0, i), flags))
 122         return 1;
 123     }
 124
 125   return 0;
 126 }
 127
 128 machine_mode
 129 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
 130                                machine_mode mode,
 131                                int *punsignedp ATTRIBUTE_UNUSED,
 132                                const_tree funtype ATTRIBUTE_UNUSED,
 133                                int for_return ATTRIBUTE_UNUSED)
 134 {
 135   if (type != NULL_TREE && for_return == 2)
 136     return promote_mode (type, mode, punsignedp);
 137   return mode;
 138 }
 139
 140 machine_mode
 141 default_promote_function_mode_always_promote (const_tree type,
 142                                               machine_mode mode,
 143                                               int *punsignedp,
 144                                               const_tree funtype ATTRIBUTE_UNUSED,
 145                                               int for_return ATTRIBUTE_UNUSED)
 146 {
 147   return promote_mode (type, mode, punsignedp);
 148 }
 149
 150 machine_mode
 151 default_cc_modes_compatible (machine_mode m1, machine_mode m2)
 152 {
 153   if (m1 == m2)
 154     return m1;
 155   return VOIDmode;
 156 }
 157
 158 bool
 159 default_return_in_memory (const_tree type,
 160                           const_tree fntype ATTRIBUTE_UNUSED)
 161 {
 162   return (TYPE_MODE (type) == BLKmode);
 163 }
 164
 165 rtx
 166 default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED,
 167                             machine_mode mode ATTRIBUTE_UNUSED)
 168 {
 169   return x;
 170 }
 171
 172 bool
 173 default_legitimize_address_displacement (rtx *disp ATTRIBUTE_UNUSED,
 174                                          rtx *offset ATTRIBUTE_UNUSED,
 175                                          machine_mode mode ATTRIBUTE_UNUSED)
 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 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     size = GET_MODE_SIZE (mode);
 799
 800   if (size < (PARM_BOUNDARY / BITS_PER_UNIT))
 801     return PAD_DOWNWARD;
 802
 803   return PAD_UPWARD;
 804 }
 805
 806 rtx
 807 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 808                       machine_mode mode ATTRIBUTE_UNUSED,
 809                       const_tree type ATTRIBUTE_UNUSED,
 810                       bool named ATTRIBUTE_UNUSED)
 811 {
 812   gcc_unreachable ();
 813 }
 814
 815 rtx
 816 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 817                                machine_mode mode ATTRIBUTE_UNUSED,
 818                                const_tree type ATTRIBUTE_UNUSED,
 819                                bool named ATTRIBUTE_UNUSED)
 820 {
 821   gcc_unreachable ();
 822 }
 823
 824 unsigned int
 825 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 826                                const_tree type ATTRIBUTE_UNUSED)
 827 {
 828   return PARM_BOUNDARY;
 829 }
 830
 831 unsigned int
 832 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 833                                      const_tree type ATTRIBUTE_UNUSED)
 834 {
 835   return PARM_BOUNDARY;
 836 }
 837
 838 void
 839 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
 840 {
 841 }
 842
 843 const char *
 844 hook_invalid_arg_for_unprototyped_fn (
 845         const_tree typelist ATTRIBUTE_UNUSED,
 846         const_tree funcdecl ATTRIBUTE_UNUSED,
 847         const_tree val ATTRIBUTE_UNUSED)
 848 {
 849   return NULL;
 850 }
 851
 852 /* Initialize the stack protection decls.  */
 853
 854 /* Stack protection related decls living in libgcc.  */
 855 static GTY(()) tree stack_chk_guard_decl;
 856
 857 tree
 858 default_stack_protect_guard (void)
 859 {
 860   tree t = stack_chk_guard_decl;
 861
 862   if (t == NULL)
 863     {
 864       rtx x;
 865
 866       t = build_decl (UNKNOWN_LOCATION,
 867                       VAR_DECL, get_identifier ("__stack_chk_guard"),
 868                       ptr_type_node);
 869       TREE_STATIC (t) = 1;
 870       TREE_PUBLIC (t) = 1;
 871       DECL_EXTERNAL (t) = 1;
 872       TREE_USED (t) = 1;
 873       TREE_THIS_VOLATILE (t) = 1;
 874       DECL_ARTIFICIAL (t) = 1;
 875       DECL_IGNORED_P (t) = 1;
 876
 877       /* Do not share RTL as the declaration is visible outside of
 878          current function.  */
 879       x = DECL_RTL (t);
 880       RTX_FLAG (x, used) = 1;
 881
 882       stack_chk_guard_decl = t;
 883     }
 884
 885   return t;
 886 }
 887
 888 static GTY(()) tree stack_chk_fail_decl;
 889
 890 tree
 891 default_external_stack_protect_fail (void)
 892 {
 893   tree t = stack_chk_fail_decl;
 894
 895   if (t == NULL_TREE)
 896     {
 897       t = build_function_type_list (void_type_node, NULL_TREE);
 898       t = build_decl (UNKNOWN_LOCATION,
 899                       FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
 900       TREE_STATIC (t) = 1;
 901       TREE_PUBLIC (t) = 1;
 902       DECL_EXTERNAL (t) = 1;
 903       TREE_USED (t) = 1;
 904       TREE_THIS_VOLATILE (t) = 1;
 905       TREE_NOTHROW (t) = 1;
 906       DECL_ARTIFICIAL (t) = 1;
 907       DECL_IGNORED_P (t) = 1;
 908       DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
 909       DECL_VISIBILITY_SPECIFIED (t) = 1;
 910
 911       stack_chk_fail_decl = t;
 912     }
 913
 914   return build_call_expr (t, 0);
 915 }
 916
 917 tree
 918 default_hidden_stack_protect_fail (void)
 919 {
 920 #ifndef HAVE_GAS_HIDDEN
 921   return default_external_stack_protect_fail ();
 922 #else
 923   tree t = stack_chk_fail_decl;
 924
 925   if (!flag_pic)
 926     return default_external_stack_protect_fail ();
 927
 928   if (t == NULL_TREE)
 929     {
 930       t = build_function_type_list (void_type_node, NULL_TREE);
 931       t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
 932                       get_identifier ("__stack_chk_fail_local"), t);
 933       TREE_STATIC (t) = 1;
 934       TREE_PUBLIC (t) = 1;
 935       DECL_EXTERNAL (t) = 1;
 936       TREE_USED (t) = 1;
 937       TREE_THIS_VOLATILE (t) = 1;
 938       TREE_NOTHROW (t) = 1;
 939       DECL_ARTIFICIAL (t) = 1;
 940       DECL_IGNORED_P (t) = 1;
 941       DECL_VISIBILITY_SPECIFIED (t) = 1;
 942       DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
 943
 944       stack_chk_fail_decl = t;
 945     }
 946
 947   return build_call_expr (t, 0);
 948 #endif
 949 }
 950
 951 bool
 952 hook_bool_const_rtx_commutative_p (const_rtx x,
 953                                    int outer_code ATTRIBUTE_UNUSED)
 954 {
 955   return COMMUTATIVE_P (x);
 956 }
 957
 958 rtx
 959 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
 960                         const_tree fn_decl_or_type,
 961                         bool outgoing ATTRIBUTE_UNUSED)
 962 {
 963   /* The old interface doesn't handle receiving the function type.  */
 964   if (fn_decl_or_type
 965       && !DECL_P (fn_decl_or_type))
 966     fn_decl_or_type = NULL;
 967
 968 #ifdef FUNCTION_VALUE
 969   return FUNCTION_VALUE (ret_type, fn_decl_or_type);
 970 #else
 971   gcc_unreachable ();
 972 #endif
 973 }
 974
 975 rtx
 976 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED,
 977                        const_rtx fun ATTRIBUTE_UNUSED)
 978 {
 979 #ifdef LIBCALL_VALUE
 980   return LIBCALL_VALUE (mode);
 981 #else
 982   gcc_unreachable ();
 983 #endif
 984 }
 985
 986 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P.  */
 987
 988 bool
 989 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
 990 {
 991 #ifdef FUNCTION_VALUE_REGNO_P
 992   return FUNCTION_VALUE_REGNO_P (regno);
 993 #else
 994   gcc_unreachable ();
 995 #endif
 996 }
 997
 998 rtx
 999 default_internal_arg_pointer (void)
1000 {
1001   /* If the reg that the virtual arg pointer will be translated into is
1002      not a fixed reg or is the stack pointer, make a copy of the virtual
1003      arg pointer, and address parms via the copy.  The frame pointer is
1004      considered fixed even though it is not marked as such.  */
1005   if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
1006        || ! (fixed_regs[ARG_POINTER_REGNUM]
1007              || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
1008     return copy_to_reg (virtual_incoming_args_rtx);
1009   else
1010     return virtual_incoming_args_rtx;
1011 }
1012
1013 rtx
1014 default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
1015 {
1016   if (incoming_p)
1017     {
1018 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1019       return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
1020 #endif
1021     }
1022
1023 #ifdef STATIC_CHAIN_REGNUM
1024   return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
1025 #endif
1026
1027   {
1028     static bool issued_error;
1029     if (!issued_error)
1030       {
1031         issued_error = true;
1032         sorry ("nested functions not supported on this target");
1033       }
1034
1035     /* It really doesn't matter what we return here, so long at it
1036        doesn't cause the rest of the compiler to crash.  */
1037     return gen_rtx_MEM (Pmode, stack_pointer_rtx);
1038   }
1039 }
1040
1041 void
1042 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
1043                          rtx ARG_UNUSED (r_chain))
1044 {
1045   sorry ("nested function trampolines not supported on this target");
1046 }
1047
1048 int
1049 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED,
1050                           tree funtype ATTRIBUTE_UNUSED,
1051                           int size ATTRIBUTE_UNUSED)
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, reload_mode, x);
1111 #endif
1112 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1113   if (! in_p)
1114     rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
1115 #endif
1116   if (rclass != NO_REGS)
1117     {
1118       enum insn_code icode
1119         = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
1120                                 reload_mode);
1121
1122       if (icode != CODE_FOR_nothing
1123           && !insn_operand_matches (icode, in_p, x))
1124         icode = CODE_FOR_nothing;
1125       else if (icode != CODE_FOR_nothing)
1126         {
1127           const char *insn_constraint, *scratch_constraint;
1128           enum reg_class insn_class, scratch_class;
1129
1130           gcc_assert (insn_data[(int) icode].n_operands == 3);
1131           insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
1132           if (!*insn_constraint)
1133             insn_class = ALL_REGS;
1134           else
1135             {
1136               if (in_p)
1137                 {
1138                   gcc_assert (*insn_constraint == '=');
1139                   insn_constraint++;
1140                 }
1141               insn_class = (reg_class_for_constraint
1142                             (lookup_constraint (insn_constraint)));
1143               gcc_assert (insn_class != NO_REGS);
1144             }
1145
1146           scratch_constraint = insn_data[(int) icode].operand[2].constraint;
1147           /* The scratch register's constraint must start with "=&",
1148              except for an input reload, where only "=" is necessary,
1149              and where it might be beneficial to re-use registers from
1150              the input.  */
1151           gcc_assert (scratch_constraint[0] == '='
1152                       && (in_p || scratch_constraint[1] == '&'));
1153           scratch_constraint++;
1154           if (*scratch_constraint == '&')
1155             scratch_constraint++;
1156           scratch_class = (reg_class_for_constraint
1157                            (lookup_constraint (scratch_constraint)));
1158
1159           if (reg_class_subset_p (reload_class, insn_class))
1160             {
1161               gcc_assert (scratch_class == rclass);
1162               rclass = NO_REGS;
1163             }
1164           else
1165             rclass = insn_class;
1166
1167         }
1168       if (rclass == NO_REGS)
1169         sri->icode = icode;
1170       else
1171         sri->t_icode = icode;
1172     }
1173   return rclass;
1174 }
1175
1176 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE.  */
1177
1178 machine_mode
1179 default_secondary_memory_needed_mode (machine_mode mode)
1180 {
1181   if (!targetm.lra_p ()
1182       && GET_MODE_BITSIZE (mode) < BITS_PER_WORD
1183       && INTEGRAL_MODE_P (mode))
1184     return mode_for_size (BITS_PER_WORD, GET_MODE_CLASS (mode), 0).require ();
1185   return mode;
1186 }
1187
1188 /* By default, if flag_pic is true, then neither local nor global relocs
1189    should be placed in readonly memory.  */
1190
1191 int
1192 default_reloc_rw_mask (void)
1193 {
1194   return flag_pic ? 3 : 0;
1195 }
1196
1197 /* By default, do no modification. */
1198 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
1199                                          tree id)
1200 {
1201    return id;
1202 }
1203
1204 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT.  */
1205
1206 HOST_WIDE_INT
1207 default_static_rtx_alignment (machine_mode mode)
1208 {
1209   return GET_MODE_ALIGNMENT (mode);
1210 }
1211
1212 /* The default implementation of TARGET_CONSTANT_ALIGNMENT.  */
1213
1214 HOST_WIDE_INT
1215 default_constant_alignment (const_tree, HOST_WIDE_INT align)
1216 {
1217   return align;
1218 }
1219
1220 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1221    to at least BITS_PER_WORD but otherwise makes no changes.  */
1222
1223 HOST_WIDE_INT
1224 constant_alignment_word_strings (const_tree exp, HOST_WIDE_INT align)
1225 {
1226   if (TREE_CODE (exp) == STRING_CST)
1227     return MAX (align, BITS_PER_WORD);
1228   return align;
1229 }
1230
1231 /* Default to natural alignment for vector types.  */
1232 HOST_WIDE_INT
1233 default_vector_alignment (const_tree type)
1234 {
1235   HOST_WIDE_INT align = tree_to_shwi (TYPE_SIZE (type));
1236   if (align > MAX_OFILE_ALIGNMENT)
1237     align = MAX_OFILE_ALIGNMENT;
1238   return align;
1239 }
1240
1241 /* The default implementation of
1242    TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT.  */
1243
1244 HOST_WIDE_INT
1245 default_preferred_vector_alignment (const_tree type)
1246 {
1247   return TYPE_ALIGN (type);
1248 }
1249
1250 /* By default assume vectors of element TYPE require a multiple of the natural
1251    alignment of TYPE.  TYPE is naturally aligned if IS_PACKED is false.  */
1252 bool
1253 default_builtin_vector_alignment_reachable (const_tree /*type*/, bool is_packed)
1254 {
1255   return ! is_packed;
1256 }
1257
1258 /* By default, assume that a target supports any factor of misalignment
1259    memory access if it supports movmisalign patten.
1260    is_packed is true if the memory access is defined in a packed struct.  */
1261 bool
1262 default_builtin_support_vector_misalignment (machine_mode mode,
1263                                              const_tree type
1264                                              ATTRIBUTE_UNUSED,
1265                                              int misalignment
1266                                              ATTRIBUTE_UNUSED,
1267                                              bool is_packed
1268                                              ATTRIBUTE_UNUSED)
1269 {
1270   if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1271     return true;
1272   return false;
1273 }
1274
1275 /* By default, only attempt to parallelize bitwise operations, and
1276    possibly adds/subtracts using bit-twiddling.  */
1277
1278 machine_mode
1279 default_preferred_simd_mode (scalar_mode)
1280 {
1281   return word_mode;
1282 }
1283
1284 /* By default only the size derived from the preferred vector mode
1285    is tried.  */
1286
1287 unsigned int
1288 default_autovectorize_vector_sizes (void)
1289 {
1290   return 0;
1291 }
1292
1293 /* By defaults a vector of integers is used as a mask.  */
1294
1295 opt_machine_mode
1296 default_get_mask_mode (unsigned nunits, unsigned vector_size)
1297 {
1298   unsigned elem_size = vector_size / nunits;
1299   scalar_int_mode elem_mode
1300     = smallest_int_mode_for_size (elem_size * BITS_PER_UNIT);
1301   machine_mode vector_mode;
1302
1303   gcc_assert (elem_size * nunits == vector_size);
1304
1305   if (mode_for_vector (elem_mode, nunits).exists (&vector_mode)
1306       && VECTOR_MODE_P (vector_mode)
1307       && targetm.vector_mode_supported_p (vector_mode))
1308     return vector_mode;
1309
1310   return opt_machine_mode ();
1311 }
1312
1313 /* By default, the cost model accumulates three separate costs (prologue,
1314    loop body, and epilogue) for a vectorized loop or block.  So allocate an
1315    array of three unsigned ints, set it to zero, and return its address.  */
1316
1317 void *
1318 default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED)
1319 {
1320   unsigned *cost = XNEWVEC (unsigned, 3);
1321   cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0;
1322   return cost;
1323 }
1324
1325 /* By default, the cost model looks up the cost of the given statement
1326    kind and mode, multiplies it by the occurrence count, accumulates
1327    it into the cost specified by WHERE, and returns the cost added.  */
1328
1329 unsigned
1330 default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
1331                        struct _stmt_vec_info *stmt_info, int misalign,
1332                        enum vect_cost_model_location where)
1333 {
1334   unsigned *cost = (unsigned *) data;
1335   unsigned retval = 0;
1336
1337   tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE;
1338   int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype,
1339                                                                 misalign);
1340    /* Statements in an inner loop relative to the loop being
1341       vectorized are weighted more heavily.  The value here is
1342       arbitrary and could potentially be improved with analysis.  */
1343   if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info))
1344     count *= 50;  /* FIXME.  */
1345
1346   retval = (unsigned) (count * stmt_cost);
1347   cost[where] += retval;
1348
1349   return retval;
1350 }
1351
1352 /* By default, the cost model just returns the accumulated costs.  */
1353
1354 void
1355 default_finish_cost (void *data, unsigned *prologue_cost,
1356                      unsigned *body_cost, unsigned *epilogue_cost)
1357 {
1358   unsigned *cost = (unsigned *) data;
1359   *prologue_cost = cost[vect_prologue];
1360   *body_cost     = cost[vect_body];
1361   *epilogue_cost = cost[vect_epilogue];
1362 }
1363
1364 /* Free the cost data.  */
1365
1366 void
1367 default_destroy_cost_data (void *data)
1368 {
1369   free (data);
1370 }
1371
1372 /* Determine whether or not a pointer mode is valid. Assume defaults
1373    of ptr_mode or Pmode - can be overridden.  */
1374 bool
1375 default_valid_pointer_mode (scalar_int_mode mode)
1376 {
1377   return (mode == ptr_mode || mode == Pmode);
1378 }
1379
1380 /* Determine whether the memory reference specified by REF may alias
1381    the C libraries errno location.  */
1382 bool
1383 default_ref_may_alias_errno (ao_ref *ref)
1384 {
1385   tree base = ao_ref_base (ref);
1386   /* The default implementation assumes the errno location is
1387      a declaration of type int or is always accessed via a
1388      pointer to int.  We assume that accesses to errno are
1389      not deliberately obfuscated (even in conforming ways).  */
1390   if (TYPE_UNSIGNED (TREE_TYPE (base))
1391       || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1392     return false;
1393   /* The default implementation assumes an errno location
1394      declaration is never defined in the current compilation unit.  */
1395   if (DECL_P (base)
1396       && !TREE_STATIC (base))
1397     return true;
1398   else if (TREE_CODE (base) == MEM_REF
1399            && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1400     {
1401       struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1402       return !pi || pi->pt.anything || pi->pt.nonlocal;
1403     }
1404   return false;
1405 }
1406
1407 /* Return the mode for a pointer to a given ADDRSPACE,
1408    defaulting to ptr_mode for all address spaces.  */
1409
1410 scalar_int_mode
1411 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1412 {
1413   return ptr_mode;
1414 }
1415
1416 /* Return the mode for an address in a given ADDRSPACE,
1417    defaulting to Pmode for all address spaces.  */
1418
1419 scalar_int_mode
1420 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1421 {
1422   return Pmode;
1423 }
1424
1425 /* Named address space version of valid_pointer_mode.
1426    To match the above, the same modes apply to all address spaces.  */
1427
1428 bool
1429 default_addr_space_valid_pointer_mode (scalar_int_mode mode,
1430                                        addr_space_t as ATTRIBUTE_UNUSED)
1431 {
1432   return targetm.valid_pointer_mode (mode);
1433 }
1434
1435 /* Some places still assume that all pointer or address modes are the
1436    standard Pmode and ptr_mode.  These optimizations become invalid if
1437    the target actually supports multiple different modes.  For now,
1438    we disable such optimizations on such targets, using this function.  */
1439
1440 bool
1441 target_default_pointer_address_modes_p (void)
1442 {
1443   if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1444     return false;
1445   if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1446     return false;
1447
1448   return true;
1449 }
1450
1451 /* Named address space version of legitimate_address_p.
1452    By default, all address spaces have the same form.  */
1453
1454 bool
1455 default_addr_space_legitimate_address_p (machine_mode mode, rtx mem,
1456                                          bool strict,
1457                                          addr_space_t as ATTRIBUTE_UNUSED)
1458 {
1459   return targetm.legitimate_address_p (mode, mem, strict);
1460 }
1461
1462 /* Named address space version of LEGITIMIZE_ADDRESS.
1463    By default, all address spaces have the same form.  */
1464
1465 rtx
1466 default_addr_space_legitimize_address (rtx x, rtx oldx, machine_mode mode,
1467                                        addr_space_t as ATTRIBUTE_UNUSED)
1468 {
1469   return targetm.legitimize_address (x, oldx, mode);
1470 }
1471
1472 /* The default hook for determining if one named address space is a subset of
1473    another and to return which address space to use as the common address
1474    space.  */
1475
1476 bool
1477 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1478 {
1479   return (subset == superset);
1480 }
1481
1482 /* The default hook for determining if 0 within a named address
1483    space is a valid address.  */
1484
1485 bool
1486 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED)
1487 {
1488   return false;
1489 }
1490
1491 /* The default hook for debugging the address space is to return the
1492    address space number to indicate DW_AT_address_class.  */
1493 int
1494 default_addr_space_debug (addr_space_t as)
1495 {
1496   return as;
1497 }
1498
1499 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1500    Don't complain about any address space.  */
1501
1502 void
1503 default_addr_space_diagnose_usage (addr_space_t, location_t)
1504 {
1505 }
1506
1507
1508 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1509    called for targets with only a generic address space.  */
1510
1511 rtx
1512 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1513                             tree from_type ATTRIBUTE_UNUSED,
1514                             tree to_type ATTRIBUTE_UNUSED)
1515 {
1516   gcc_unreachable ();
1517 }
1518
1519 /* The defualt implementation of TARGET_HARD_REGNO_NREGS.  */
1520
1521 unsigned int
1522 default_hard_regno_nregs (unsigned int, machine_mode mode)
1523 {
1524   return CEIL (GET_MODE_SIZE (mode), UNITS_PER_WORD);
1525 }
1526
1527 bool
1528 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1529 {
1530   return true;
1531 }
1532
1533 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P.  */
1534
1535 bool
1536 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED,
1537                                   addr_space_t addrspace ATTRIBUTE_UNUSED)
1538 {
1539   return false;
1540 }
1541
1542 bool
1543 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1544                                          tree ARG_UNUSED (name),
1545                                          tree ARG_UNUSED (args),
1546                                          int ARG_UNUSED (flags))
1547 {
1548   warning (OPT_Wattributes,
1549            "target attribute is not supported on this machine");
1550
1551   return false;
1552 }
1553
1554 bool
1555 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1556                                     tree ARG_UNUSED (pop_target))
1557 {
1558   /* If args is NULL the caller is handle_pragma_pop_options ().  In that case,
1559      emit no warning because "#pragma GCC pop_target" is valid on targets that
1560      do not have the "target" pragma.  */
1561   if (args)
1562     warning (OPT_Wpragmas,
1563              "#pragma GCC target is not supported for this machine");
1564
1565   return false;
1566 }
1567
1568 bool
1569 default_target_can_inline_p (tree caller, tree callee)
1570 {
1571   tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1572   tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1573   if (! callee_opts)
1574     callee_opts = target_option_default_node;
1575   if (! caller_opts)
1576     caller_opts = target_option_default_node;
1577
1578   /* If both caller and callee have attributes, assume that if the
1579      pointer is different, the two functions have different target
1580      options since build_target_option_node uses a hash table for the
1581      options.  */
1582   return callee_opts == caller_opts;
1583 }
1584
1585 /* If the machine does not have a case insn that compares the bounds,
1586    this means extra overhead for dispatch tables, which raises the
1587    threshold for using them.  */
1588
1589 unsigned int
1590 default_case_values_threshold (void)
1591 {
1592   return (targetm.have_casesi () ? 4 : 5);
1593 }
1594
1595 bool
1596 default_have_conditional_execution (void)
1597 {
1598   return HAVE_conditional_execution;
1599 }
1600
1601 /* By default we assume that c99 functions are present at the runtime,
1602    but sincos is not.  */
1603 bool
1604 default_libc_has_function (enum function_class fn_class)
1605 {
1606   if (fn_class == function_c94
1607       || fn_class == function_c99_misc
1608       || fn_class == function_c99_math_complex)
1609     return true;
1610
1611   return false;
1612 }
1613
1614 bool
1615 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1616 {
1617   return true;
1618 }
1619
1620 bool
1621 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1622 {
1623   return false;
1624 }
1625
1626 tree
1627 default_builtin_tm_load_store (tree ARG_UNUSED (type))
1628 {
1629   return NULL_TREE;
1630 }
1631
1632 /* Compute cost of moving registers to/from memory.  */
1633
1634 int
1635 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1636                           reg_class_t rclass ATTRIBUTE_UNUSED,
1637                           bool in ATTRIBUTE_UNUSED)
1638 {
1639 #ifndef MEMORY_MOVE_COST
1640     return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1641 #else
1642     return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in);
1643 #endif
1644 }
1645
1646 /* Compute cost of moving data from a register of class FROM to one of
1647    TO, using MODE.  */
1648
1649 int
1650 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1651                             reg_class_t from ATTRIBUTE_UNUSED,
1652                             reg_class_t to ATTRIBUTE_UNUSED)
1653 {
1654 #ifndef REGISTER_MOVE_COST
1655   return 2;
1656 #else
1657   return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to);
1658 #endif
1659 }
1660
1661 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS.  */
1662
1663 bool
1664 default_slow_unaligned_access (machine_mode, unsigned int)
1665 {
1666   return STRICT_ALIGNMENT;
1667 }
1668
1669 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1670    behavior.  SPEED_P is true if we are compiling for speed.  */
1671
1672 unsigned int
1673 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED)
1674 {
1675   unsigned int move_ratio;
1676 #ifdef MOVE_RATIO
1677   move_ratio = (unsigned int) MOVE_RATIO (speed_p);
1678 #else
1679 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1680   move_ratio = 2;
1681 #else /* No movmem patterns, pick a default.  */
1682   move_ratio = ((speed_p) ? 15 : 3);
1683 #endif
1684 #endif
1685   return move_ratio;
1686 }
1687
1688 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1689    used; return FALSE if the movmem/setmem optab should be expanded, or
1690    a call to memcpy emitted.  */
1691
1692 bool
1693 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
1694                                         unsigned int alignment,
1695                                         enum by_pieces_operation op,
1696                                         bool speed_p)
1697 {
1698   unsigned int max_size = 0;
1699   unsigned int ratio = 0;
1700
1701   switch (op)
1702     {
1703     case CLEAR_BY_PIECES:
1704       max_size = STORE_MAX_PIECES;
1705       ratio = CLEAR_RATIO (speed_p);
1706       break;
1707     case MOVE_BY_PIECES:
1708       max_size = MOVE_MAX_PIECES;
1709       ratio = get_move_ratio (speed_p);
1710       break;
1711     case SET_BY_PIECES:
1712       max_size = STORE_MAX_PIECES;
1713       ratio = SET_RATIO (speed_p);
1714       break;
1715     case STORE_BY_PIECES:
1716       max_size = STORE_MAX_PIECES;
1717       ratio = get_move_ratio (speed_p);
1718       break;
1719     case COMPARE_BY_PIECES:
1720       max_size = COMPARE_MAX_PIECES;
1721       /* Pick a likely default, just as in get_move_ratio.  */
1722       ratio = speed_p ? 15 : 3;
1723       break;
1724     }
1725
1726   return by_pieces_ninsns (size, alignment, max_size + 1, op) < ratio;
1727 }
1728
1729 /* This hook controls code generation for expanding a memcmp operation by
1730    pieces.  Return 1 for the normal pattern of compare/jump after each pair
1731    of loads, or a higher number to reduce the number of branches.  */
1732
1733 int
1734 default_compare_by_pieces_branch_ratio (machine_mode)
1735 {
1736   return 1;
1737 }
1738
1739 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1740    entry.  If RECORD_P is true and the target supports named sections,
1741    the location of the NOPs will be recorded in a special object section
1742    called "__patchable_function_entries".  This routine may be called
1743    twice per function to put NOPs before and after the function
1744    entry.  */
1745
1746 void
1747 default_print_patchable_function_entry (FILE *file,
1748                                         unsigned HOST_WIDE_INT patch_area_size,
1749                                         bool record_p)
1750 {
1751   const char *nop_templ = 0;
1752   int code_num;
1753   rtx_insn *my_nop = make_insn_raw (gen_nop ());
1754
1755   /* We use the template alone, relying on the (currently sane) assumption
1756      that the NOP template does not have variable operands.  */
1757   code_num = recog_memoized (my_nop);
1758   nop_templ = get_insn_template (code_num, my_nop);
1759
1760   if (record_p && targetm_common.have_named_sections)
1761     {
1762       char buf[256];
1763       static int patch_area_number;
1764       section *previous_section = in_section;
1765
1766       patch_area_number++;
1767       ASM_GENERATE_INTERNAL_LABEL (buf, "LPFE", patch_area_number);
1768
1769       switch_to_section (get_section ("__patchable_function_entries",
1770                                       0, NULL));
1771       fputs (integer_asm_op (POINTER_SIZE_UNITS, false), file);
1772       assemble_name_raw (file, buf);
1773       fputc ('\n', file);
1774
1775       switch_to_section (previous_section);
1776       ASM_OUTPUT_LABEL (file, buf);
1777     }
1778
1779   unsigned i;
1780   for (i = 0; i < patch_area_size; ++i)
1781     fprintf (file, "\t%s\n", nop_templ);
1782 }
1783
1784 bool
1785 default_profile_before_prologue (void)
1786 {
1787 #ifdef PROFILE_BEFORE_PROLOGUE
1788   return true;
1789 #else
1790   return false;
1791 #endif
1792 }
1793
1794 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS.  */
1795
1796 reg_class_t
1797 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1798                                 reg_class_t rclass)
1799 {
1800 #ifdef PREFERRED_RELOAD_CLASS
1801   return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1802 #else
1803   return rclass;
1804 #endif
1805 }
1806
1807 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS.  */
1808
1809 reg_class_t
1810 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1811                                        reg_class_t rclass)
1812 {
1813   return rclass;
1814 }
1815
1816 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS.  */
1817 reg_class_t
1818 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1819 {
1820   return NO_REGS;
1821 }
1822
1823 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P.  */
1824
1825 bool
1826 default_class_likely_spilled_p (reg_class_t rclass)
1827 {
1828   return (reg_class_size[(int) rclass] == 1);
1829 }
1830
1831 /* The default implementation of TARGET_CLASS_MAX_NREGS.  */
1832
1833 unsigned char
1834 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1835                          machine_mode mode ATTRIBUTE_UNUSED)
1836 {
1837 #ifdef CLASS_MAX_NREGS
1838   return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass, mode);
1839 #else
1840   return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD);
1841 #endif
1842 }
1843
1844 /* Determine the debugging unwind mechanism for the target.  */
1845
1846 enum unwind_info_type
1847 default_debug_unwind_info (void)
1848 {
1849   /* If the target wants to force the use of dwarf2 unwind info, let it.  */
1850   /* ??? Change all users to the hook, then poison this.  */
1851 #ifdef DWARF2_FRAME_INFO
1852   if (DWARF2_FRAME_INFO)
1853     return UI_DWARF2;
1854 #endif
1855
1856   /* Otherwise, only turn it on if dwarf2 debugging is enabled.  */
1857 #ifdef DWARF2_DEBUGGING_INFO
1858   if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1859     return UI_DWARF2;
1860 #endif
1861
1862   return UI_NONE;
1863 }
1864
1865 /* Determine the correct mode for a Dwarf frame register that represents
1866    register REGNO.  */
1867
1868 machine_mode
1869 default_dwarf_frame_reg_mode (int regno)
1870 {
1871   machine_mode save_mode = reg_raw_mode[regno];
1872
1873   if (targetm.hard_regno_call_part_clobbered (regno, save_mode))
1874     save_mode = choose_hard_reg_mode (regno, 1, true);
1875   return save_mode;
1876 }
1877
1878 /* To be used by targets where reg_raw_mode doesn't return the right
1879    mode for registers used in apply_builtin_return and apply_builtin_arg.  */
1880
1881 fixed_size_mode
1882 default_get_reg_raw_mode (int regno)
1883 {
1884   /* Targets must override this hook if the underlying register is
1885      variable-sized.  */
1886   return as_a <fixed_size_mode> (reg_raw_mode[regno]);
1887 }
1888
1889 /* Return true if a leaf function should stay leaf even with profiling
1890    enabled.  */
1891
1892 bool
1893 default_keep_leaf_when_profiled ()
1894 {
1895   return false;
1896 }
1897
1898 /* Return true if the state of option OPTION should be stored in PCH files
1899    and checked by default_pch_valid_p.  Store the option's current state
1900    in STATE if so.  */
1901
1902 static inline bool
1903 option_affects_pch_p (int option, struct cl_option_state *state)
1904 {
1905   if ((cl_options[option].flags & CL_TARGET) == 0)
1906     return false;
1907   if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
1908     return false;
1909   if (option_flag_var (option, &global_options) == &target_flags)
1910     if (targetm.check_pch_target_flags)
1911       return false;
1912   return get_option_state (&global_options, option, state);
1913 }
1914
1915 /* Default version of get_pch_validity.
1916    By default, every flag difference is fatal; that will be mostly right for
1917    most targets, but completely right for very few.  */
1918
1919 void *
1920 default_get_pch_validity (size_t *sz)
1921 {
1922   struct cl_option_state state;
1923   size_t i;
1924   char *result, *r;
1925
1926   *sz = 2;
1927   if (targetm.check_pch_target_flags)
1928     *sz += sizeof (target_flags);
1929   for (i = 0; i < cl_options_count; i++)
1930     if (option_affects_pch_p (i, &state))
1931       *sz += state.size;
1932
1933   result = r = XNEWVEC (char, *sz);
1934   r[0] = flag_pic;
1935   r[1] = flag_pie;
1936   r += 2;
1937   if (targetm.check_pch_target_flags)
1938     {
1939       memcpy (r, &target_flags, sizeof (target_flags));
1940       r += sizeof (target_flags);
1941     }
1942
1943   for (i = 0; i < cl_options_count; i++)
1944     if (option_affects_pch_p (i, &state))
1945       {
1946         memcpy (r, state.data, state.size);
1947         r += state.size;
1948       }
1949
1950   return result;
1951 }
1952
1953 /* Return a message which says that a PCH file was created with a different
1954    setting of OPTION.  */
1955
1956 static const char *
1957 pch_option_mismatch (const char *option)
1958 {
1959   return xasprintf (_("created and used with differing settings of '%s'"),
1960                     option);
1961 }
1962
1963 /* Default version of pch_valid_p.  */
1964
1965 const char *
1966 default_pch_valid_p (const void *data_p, size_t len)
1967 {
1968   struct cl_option_state state;
1969   const char *data = (const char *)data_p;
1970   size_t i;
1971
1972   /* -fpic and -fpie also usually make a PCH invalid.  */
1973   if (data[0] != flag_pic)
1974     return _("created and used with different settings of -fpic");
1975   if (data[1] != flag_pie)
1976     return _("created and used with different settings of -fpie");
1977   data += 2;
1978
1979   /* Check target_flags.  */
1980   if (targetm.check_pch_target_flags)
1981     {
1982       int tf;
1983       const char *r;
1984
1985       memcpy (&tf, data, sizeof (target_flags));
1986       data += sizeof (target_flags);
1987       len -= sizeof (target_flags);
1988       r = targetm.check_pch_target_flags (tf);
1989       if (r != NULL)
1990         return r;
1991     }
1992
1993   for (i = 0; i < cl_options_count; i++)
1994     if (option_affects_pch_p (i, &state))
1995       {
1996         if (memcmp (data, state.data, state.size) != 0)
1997           return pch_option_mismatch (cl_options[i].opt_text);
1998         data += state.size;
1999         len -= state.size;
2000       }
2001
2002   return NULL;
2003 }
2004
2005 /* Default version of cstore_mode.  */
2006
2007 scalar_int_mode
2008 default_cstore_mode (enum insn_code icode)
2009 {
2010   return as_a <scalar_int_mode> (insn_data[(int) icode].operand[0].mode);
2011 }
2012
2013 /* Default version of member_type_forces_blk.  */
2014
2015 bool
2016 default_member_type_forces_blk (const_tree, machine_mode)
2017 {
2018   return false;
2019 }
2020
2021 rtx
2022 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
2023                              rtx ptr ATTRIBUTE_UNUSED,
2024                              rtx bnd ATTRIBUTE_UNUSED)
2025 {
2026   gcc_unreachable ();
2027 }
2028
2029 void
2030 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
2031                               rtx addr ATTRIBUTE_UNUSED,
2032                               rtx bounds ATTRIBUTE_UNUSED,
2033                               rtx to ATTRIBUTE_UNUSED)
2034 {
2035   gcc_unreachable ();
2036 }
2037
2038 rtx
2039 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
2040 {
2041   gcc_unreachable ();
2042 }
2043
2044 void
2045 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
2046                                rtx bounds ATTRIBUTE_UNUSED)
2047 {
2048   gcc_unreachable ();
2049 }
2050
2051 /* Default version of canonicalize_comparison.  */
2052
2053 void
2054 default_canonicalize_comparison (int *, rtx *, rtx *, bool)
2055 {
2056 }
2057
2058 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV.  */
2059
2060 void
2061 default_atomic_assign_expand_fenv (tree *, tree *, tree *)
2062 {
2063 }
2064
2065 #ifndef PAD_VARARGS_DOWN
2066 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2067 #endif
2068
2069 /* Build an indirect-ref expression over the given TREE, which represents a
2070    piece of a va_arg() expansion.  */
2071 tree
2072 build_va_arg_indirect_ref (tree addr)
2073 {
2074   addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr);
2075   return addr;
2076 }
2077
2078 /* The "standard" implementation of va_arg: read the value from the
2079    current (padded) address and increment by the (padded) size.  */
2080
2081 tree
2082 std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
2083                           gimple_seq *post_p)
2084 {
2085   tree addr, t, type_size, rounded_size, valist_tmp;
2086   unsigned HOST_WIDE_INT align, boundary;
2087   bool indirect;
2088
2089   /* All of the alignment and movement below is for args-grow-up machines.
2090      As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2091      implement their own specialized gimplify_va_arg_expr routines.  */
2092   if (ARGS_GROW_DOWNWARD)
2093     gcc_unreachable ();
2094
2095   indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false);
2096   if (indirect)
2097     type = build_pointer_type (type);
2098
2099   align = PARM_BOUNDARY / BITS_PER_UNIT;
2100   boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
2101
2102   /* When we align parameter on stack for caller, if the parameter
2103      alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2104      aligned at MAX_SUPPORTED_STACK_ALIGNMENT.  We will match callee
2105      here with caller.  */
2106   if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
2107     boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
2108
2109   boundary /= BITS_PER_UNIT;
2110
2111   /* Hoist the valist value into a temporary for the moment.  */
2112   valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
2113
2114   /* va_list pointer is aligned to PARM_BOUNDARY.  If argument actually
2115      requires greater alignment, we must perform dynamic alignment.  */
2116   if (boundary > align
2117       && !TYPE_EMPTY_P (type)
2118       && !integer_zerop (TYPE_SIZE (type)))
2119     {
2120       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2121                   fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
2122       gimplify_and_add (t, pre_p);
2123
2124       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2125                   fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
2126                                valist_tmp,
2127                                build_int_cst (TREE_TYPE (valist), -boundary)));
2128       gimplify_and_add (t, pre_p);
2129     }
2130   else
2131     boundary = align;
2132
2133   /* If the actual alignment is less than the alignment of the type,
2134      adjust the type accordingly so that we don't assume strict alignment
2135      when dereferencing the pointer.  */
2136   boundary *= BITS_PER_UNIT;
2137   if (boundary < TYPE_ALIGN (type))
2138     {
2139       type = build_variant_type_copy (type);
2140       SET_TYPE_ALIGN (type, boundary);
2141     }
2142
2143   /* Compute the rounded size of the type.  */
2144   type_size = arg_size_in_bytes (type);
2145   rounded_size = round_up (type_size, align);
2146
2147   /* Reduce rounded_size so it's sharable with the postqueue.  */
2148   gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
2149
2150   /* Get AP.  */
2151   addr = valist_tmp;
2152   if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
2153     {
2154       /* Small args are padded downward.  */
2155       t = fold_build2_loc (input_location, GT_EXPR, sizetype,
2156                        rounded_size, size_int (align));
2157       t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
2158                        size_binop (MINUS_EXPR, rounded_size, type_size));
2159       addr = fold_build_pointer_plus (addr, t);
2160     }
2161
2162   /* Compute new value for AP.  */
2163   t = fold_build_pointer_plus (valist_tmp, rounded_size);
2164   t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
2165   gimplify_and_add (t, pre_p);
2166
2167   addr = fold_convert (build_pointer_type (type), addr);
2168
2169   if (indirect)
2170     addr = build_va_arg_indirect_ref (addr);
2171
2172   return build_va_arg_indirect_ref (addr);
2173 }
2174
2175 tree
2176 default_chkp_bound_type (void)
2177 {
2178   tree res = make_node (POINTER_BOUNDS_TYPE);
2179   TYPE_PRECISION (res) = TYPE_PRECISION (size_type_node) * 2;
2180   TYPE_NAME (res) = get_identifier ("__bounds_type");
2181   SET_TYPE_MODE (res, targetm.chkp_bound_mode ());
2182   layout_type (res);
2183   return res;
2184 }
2185
2186 machine_mode
2187 default_chkp_bound_mode (void)
2188 {
2189   return VOIDmode;
2190 }
2191
2192 tree
2193 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED)
2194 {
2195   return NULL_TREE;
2196 }
2197
2198 rtx
2199 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED,
2200                                     const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
2201                                     bool outgoing ATTRIBUTE_UNUSED)
2202 {
2203   gcc_unreachable ();
2204 }
2205
2206 tree
2207 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED,
2208                                    HOST_WIDE_INT ub ATTRIBUTE_UNUSED)
2209 {
2210   return NULL_TREE;
2211 }
2212
2213 int
2214 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED,
2215                                 tree lb ATTRIBUTE_UNUSED,
2216                                 tree ub ATTRIBUTE_UNUSED,
2217                                 tree *stmts ATTRIBUTE_UNUSED)
2218 {
2219   return 0;
2220 }
2221
2222 void
2223 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
2224                                       machine_mode mode ATTRIBUTE_UNUSED,
2225                                       tree type ATTRIBUTE_UNUSED,
2226                                       int *pretend_arg_size ATTRIBUTE_UNUSED,
2227                                       int second_time ATTRIBUTE_UNUSED)
2228 {
2229 }
2230
2231 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2232    not support nested low-overhead loops.  */
2233
2234 bool
2235 can_use_doloop_if_innermost (const widest_int &, const widest_int &,
2236                              unsigned int loop_depth, bool)
2237 {
2238   return loop_depth == 1;
2239 }
2240
2241 /* Default implementation of TARGET_OPTAB_SUPPORTED_P.  */
2242
2243 bool
2244 default_optab_supported_p (int, machine_mode, machine_mode, optimization_type)
2245 {
2246   return true;
2247 }
2248
2249 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST.  */
2250
2251 unsigned int
2252 default_max_noce_ifcvt_seq_cost (edge e)
2253 {
2254   bool predictable_p = predictable_edge_p (e);
2255
2256   enum compiler_param param
2257     = (predictable_p
2258        ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2259        : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST);
2260
2261   /* If we have a parameter set, use that, otherwise take a guess using
2262      BRANCH_COST.  */
2263   if (global_options_set.x_param_values[param])
2264     return PARAM_VALUE (param);
2265   else
2266     return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (3);
2267 }
2268
2269 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION.  */
2270
2271 unsigned int
2272 default_min_arithmetic_precision (void)
2273 {
2274   return WORD_REGISTER_OPERATIONS ? BITS_PER_WORD : BITS_PER_UNIT;
2275 }
2276
2277 /* Default implementation of TARGET_C_EXCESS_PRECISION.  */
2278
2279 enum flt_eval_method
2280 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED)
2281 {
2282   return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
2283 }
2284
2285 bool
2286 default_stack_clash_protection_final_dynamic_probe (rtx residual ATTRIBUTE_UNUSED)
2287 {
2288   return 0;
2289 }
2290
2291 #include "gt-targhooks.h"