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 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED,
 760                               machine_mode mode ATTRIBUTE_UNUSED,
 761                               const_tree type ATTRIBUTE_UNUSED,
 762                               bool named ATTRIBUTE_UNUSED)
 763 {
 764   gcc_unreachable ();
 765 }
 766
 767 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET.  */
 768
 769 HOST_WIDE_INT
 770 default_function_arg_offset (machine_mode, const_tree)
 771 {
 772   return 0;
 773 }
 774
 775 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
 776    upward, but pad short args downward on big-endian machines.  */
 777
 778 pad_direction
 779 default_function_arg_padding (machine_mode mode, const_tree type)
 780 {
 781   if (!BYTES_BIG_ENDIAN)
 782     return PAD_UPWARD;
 783
 784   unsigned HOST_WIDE_INT size;
 785   if (mode == BLKmode)
 786     {
 787       if (!type || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
 788         return PAD_UPWARD;
 789       size = int_size_in_bytes (type);
 790     }
 791   else
 792     size = GET_MODE_SIZE (mode);
 793
 794   if (size < (PARM_BOUNDARY / BITS_PER_UNIT))
 795     return PAD_DOWNWARD;
 796
 797   return PAD_UPWARD;
 798 }
 799
 800 rtx
 801 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 802                       machine_mode mode ATTRIBUTE_UNUSED,
 803                       const_tree type ATTRIBUTE_UNUSED,
 804                       bool named ATTRIBUTE_UNUSED)
 805 {
 806   gcc_unreachable ();
 807 }
 808
 809 rtx
 810 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 811                                machine_mode mode ATTRIBUTE_UNUSED,
 812                                const_tree type ATTRIBUTE_UNUSED,
 813                                bool named ATTRIBUTE_UNUSED)
 814 {
 815   gcc_unreachable ();
 816 }
 817
 818 unsigned int
 819 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 820                                const_tree type ATTRIBUTE_UNUSED)
 821 {
 822   return PARM_BOUNDARY;
 823 }
 824
 825 unsigned int
 826 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 827                                      const_tree type ATTRIBUTE_UNUSED)
 828 {
 829   return PARM_BOUNDARY;
 830 }
 831
 832 void
 833 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
 834 {
 835 }
 836
 837 const char *
 838 hook_invalid_arg_for_unprototyped_fn (
 839         const_tree typelist ATTRIBUTE_UNUSED,
 840         const_tree funcdecl ATTRIBUTE_UNUSED,
 841         const_tree val ATTRIBUTE_UNUSED)
 842 {
 843   return NULL;
 844 }
 845
 846 /* Initialize the stack protection decls.  */
 847
 848 /* Stack protection related decls living in libgcc.  */
 849 static GTY(()) tree stack_chk_guard_decl;
 850
 851 tree
 852 default_stack_protect_guard (void)
 853 {
 854   tree t = stack_chk_guard_decl;
 855
 856   if (t == NULL)
 857     {
 858       rtx x;
 859
 860       t = build_decl (UNKNOWN_LOCATION,
 861                       VAR_DECL, get_identifier ("__stack_chk_guard"),
 862                       ptr_type_node);
 863       TREE_STATIC (t) = 1;
 864       TREE_PUBLIC (t) = 1;
 865       DECL_EXTERNAL (t) = 1;
 866       TREE_USED (t) = 1;
 867       TREE_THIS_VOLATILE (t) = 1;
 868       DECL_ARTIFICIAL (t) = 1;
 869       DECL_IGNORED_P (t) = 1;
 870
 871       /* Do not share RTL as the declaration is visible outside of
 872          current function.  */
 873       x = DECL_RTL (t);
 874       RTX_FLAG (x, used) = 1;
 875
 876       stack_chk_guard_decl = t;
 877     }
 878
 879   return t;
 880 }
 881
 882 static GTY(()) tree stack_chk_fail_decl;
 883
 884 tree
 885 default_external_stack_protect_fail (void)
 886 {
 887   tree t = stack_chk_fail_decl;
 888
 889   if (t == NULL_TREE)
 890     {
 891       t = build_function_type_list (void_type_node, NULL_TREE);
 892       t = build_decl (UNKNOWN_LOCATION,
 893                       FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
 894       TREE_STATIC (t) = 1;
 895       TREE_PUBLIC (t) = 1;
 896       DECL_EXTERNAL (t) = 1;
 897       TREE_USED (t) = 1;
 898       TREE_THIS_VOLATILE (t) = 1;
 899       TREE_NOTHROW (t) = 1;
 900       DECL_ARTIFICIAL (t) = 1;
 901       DECL_IGNORED_P (t) = 1;
 902       DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
 903       DECL_VISIBILITY_SPECIFIED (t) = 1;
 904
 905       stack_chk_fail_decl = t;
 906     }
 907
 908   return build_call_expr (t, 0);
 909 }
 910
 911 tree
 912 default_hidden_stack_protect_fail (void)
 913 {
 914 #ifndef HAVE_GAS_HIDDEN
 915   return default_external_stack_protect_fail ();
 916 #else
 917   tree t = stack_chk_fail_decl;
 918
 919   if (!flag_pic)
 920     return default_external_stack_protect_fail ();
 921
 922   if (t == NULL_TREE)
 923     {
 924       t = build_function_type_list (void_type_node, NULL_TREE);
 925       t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
 926                       get_identifier ("__stack_chk_fail_local"), t);
 927       TREE_STATIC (t) = 1;
 928       TREE_PUBLIC (t) = 1;
 929       DECL_EXTERNAL (t) = 1;
 930       TREE_USED (t) = 1;
 931       TREE_THIS_VOLATILE (t) = 1;
 932       TREE_NOTHROW (t) = 1;
 933       DECL_ARTIFICIAL (t) = 1;
 934       DECL_IGNORED_P (t) = 1;
 935       DECL_VISIBILITY_SPECIFIED (t) = 1;
 936       DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
 937
 938       stack_chk_fail_decl = t;
 939     }
 940
 941   return build_call_expr (t, 0);
 942 #endif
 943 }
 944
 945 bool
 946 hook_bool_const_rtx_commutative_p (const_rtx x,
 947                                    int outer_code ATTRIBUTE_UNUSED)
 948 {
 949   return COMMUTATIVE_P (x);
 950 }
 951
 952 rtx
 953 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
 954                         const_tree fn_decl_or_type,
 955                         bool outgoing ATTRIBUTE_UNUSED)
 956 {
 957   /* The old interface doesn't handle receiving the function type.  */
 958   if (fn_decl_or_type
 959       && !DECL_P (fn_decl_or_type))
 960     fn_decl_or_type = NULL;
 961
 962 #ifdef FUNCTION_VALUE
 963   return FUNCTION_VALUE (ret_type, fn_decl_or_type);
 964 #else
 965   gcc_unreachable ();
 966 #endif
 967 }
 968
 969 rtx
 970 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED,
 971                        const_rtx fun ATTRIBUTE_UNUSED)
 972 {
 973 #ifdef LIBCALL_VALUE
 974   return LIBCALL_VALUE (mode);
 975 #else
 976   gcc_unreachable ();
 977 #endif
 978 }
 979
 980 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P.  */
 981
 982 bool
 983 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
 984 {
 985 #ifdef FUNCTION_VALUE_REGNO_P
 986   return FUNCTION_VALUE_REGNO_P (regno);
 987 #else
 988   gcc_unreachable ();
 989 #endif
 990 }
 991
 992 rtx
 993 default_internal_arg_pointer (void)
 994 {
 995   /* If the reg that the virtual arg pointer will be translated into is
 996      not a fixed reg or is the stack pointer, make a copy of the virtual
 997      arg pointer, and address parms via the copy.  The frame pointer is
 998      considered fixed even though it is not marked as such.  */
 999   if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
1000        || ! (fixed_regs[ARG_POINTER_REGNUM]
1001              || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
1002     return copy_to_reg (virtual_incoming_args_rtx);
1003   else
1004     return virtual_incoming_args_rtx;
1005 }
1006
1007 rtx
1008 default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
1009 {
1010   if (incoming_p)
1011     {
1012 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1013       return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
1014 #endif
1015     }
1016
1017 #ifdef STATIC_CHAIN_REGNUM
1018   return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
1019 #endif
1020
1021   {
1022     static bool issued_error;
1023     if (!issued_error)
1024       {
1025         issued_error = true;
1026         sorry ("nested functions not supported on this target");
1027       }
1028
1029     /* It really doesn't matter what we return here, so long at it
1030        doesn't cause the rest of the compiler to crash.  */
1031     return gen_rtx_MEM (Pmode, stack_pointer_rtx);
1032   }
1033 }
1034
1035 void
1036 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
1037                          rtx ARG_UNUSED (r_chain))
1038 {
1039   sorry ("nested function trampolines not supported on this target");
1040 }
1041
1042 int
1043 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED,
1044                           tree funtype ATTRIBUTE_UNUSED,
1045                           int size ATTRIBUTE_UNUSED)
1046 {
1047   return 0;
1048 }
1049
1050 reg_class_t
1051 default_branch_target_register_class (void)
1052 {
1053   return NO_REGS;
1054 }
1055
1056 reg_class_t
1057 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED,
1058                                          reg_class_t cl,
1059                                          reg_class_t best_cl ATTRIBUTE_UNUSED)
1060 {
1061   return cl;
1062 }
1063
1064 extern bool
1065 default_lra_p (void)
1066 {
1067   return true;
1068 }
1069
1070 int
1071 default_register_priority (int hard_regno ATTRIBUTE_UNUSED)
1072 {
1073   return 0;
1074 }
1075
1076 extern bool
1077 default_register_usage_leveling_p (void)
1078 {
1079   return false;
1080 }
1081
1082 extern bool
1083 default_different_addr_displacement_p (void)
1084 {
1085   return false;
1086 }
1087
1088 reg_class_t
1089 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
1090                           reg_class_t reload_class_i ATTRIBUTE_UNUSED,
1091                           machine_mode reload_mode ATTRIBUTE_UNUSED,
1092                           secondary_reload_info *sri)
1093 {
1094   enum reg_class rclass = NO_REGS;
1095   enum reg_class reload_class = (enum reg_class) reload_class_i;
1096
1097   if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
1098     {
1099       sri->icode = sri->prev_sri->t_icode;
1100       return NO_REGS;
1101     }
1102 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1103   if (in_p)
1104     rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x);
1105 #endif
1106 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1107   if (! in_p)
1108     rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
1109 #endif
1110   if (rclass != NO_REGS)
1111     {
1112       enum insn_code icode
1113         = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
1114                                 reload_mode);
1115
1116       if (icode != CODE_FOR_nothing
1117           && !insn_operand_matches (icode, in_p, x))
1118         icode = CODE_FOR_nothing;
1119       else if (icode != CODE_FOR_nothing)
1120         {
1121           const char *insn_constraint, *scratch_constraint;
1122           enum reg_class insn_class, scratch_class;
1123
1124           gcc_assert (insn_data[(int) icode].n_operands == 3);
1125           insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
1126           if (!*insn_constraint)
1127             insn_class = ALL_REGS;
1128           else
1129             {
1130               if (in_p)
1131                 {
1132                   gcc_assert (*insn_constraint == '=');
1133                   insn_constraint++;
1134                 }
1135               insn_class = (reg_class_for_constraint
1136                             (lookup_constraint (insn_constraint)));
1137               gcc_assert (insn_class != NO_REGS);
1138             }
1139
1140           scratch_constraint = insn_data[(int) icode].operand[2].constraint;
1141           /* The scratch register's constraint must start with "=&",
1142              except for an input reload, where only "=" is necessary,
1143              and where it might be beneficial to re-use registers from
1144              the input.  */
1145           gcc_assert (scratch_constraint[0] == '='
1146                       && (in_p || scratch_constraint[1] == '&'));
1147           scratch_constraint++;
1148           if (*scratch_constraint == '&')
1149             scratch_constraint++;
1150           scratch_class = (reg_class_for_constraint
1151                            (lookup_constraint (scratch_constraint)));
1152
1153           if (reg_class_subset_p (reload_class, insn_class))
1154             {
1155               gcc_assert (scratch_class == rclass);
1156               rclass = NO_REGS;
1157             }
1158           else
1159             rclass = insn_class;
1160
1161         }
1162       if (rclass == NO_REGS)
1163         sri->icode = icode;
1164       else
1165         sri->t_icode = icode;
1166     }
1167   return rclass;
1168 }
1169
1170 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE.  */
1171
1172 machine_mode
1173 default_secondary_memory_needed_mode (machine_mode mode)
1174 {
1175   if (!targetm.lra_p ()
1176       && GET_MODE_BITSIZE (mode) < BITS_PER_WORD
1177       && INTEGRAL_MODE_P (mode))
1178     return mode_for_size (BITS_PER_WORD, GET_MODE_CLASS (mode), 0).require ();
1179   return mode;
1180 }
1181
1182 /* By default, if flag_pic is true, then neither local nor global relocs
1183    should be placed in readonly memory.  */
1184
1185 int
1186 default_reloc_rw_mask (void)
1187 {
1188   return flag_pic ? 3 : 0;
1189 }
1190
1191 /* By default, do no modification. */
1192 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
1193                                          tree id)
1194 {
1195    return id;
1196 }
1197
1198 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT.  */
1199
1200 HOST_WIDE_INT
1201 default_static_rtx_alignment (machine_mode mode)
1202 {
1203   return GET_MODE_ALIGNMENT (mode);
1204 }
1205
1206 /* The default implementation of TARGET_CONSTANT_ALIGNMENT.  */
1207
1208 HOST_WIDE_INT
1209 default_constant_alignment (const_tree, HOST_WIDE_INT align)
1210 {
1211   return align;
1212 }
1213
1214 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1215    to at least BITS_PER_WORD but otherwise makes no changes.  */
1216
1217 HOST_WIDE_INT
1218 constant_alignment_word_strings (const_tree exp, HOST_WIDE_INT align)
1219 {
1220   if (TREE_CODE (exp) == STRING_CST)
1221     return MAX (align, BITS_PER_WORD);
1222   return align;
1223 }
1224
1225 /* Default to natural alignment for vector types.  */
1226 HOST_WIDE_INT
1227 default_vector_alignment (const_tree type)
1228 {
1229   HOST_WIDE_INT align = tree_to_shwi (TYPE_SIZE (type));
1230   if (align > MAX_OFILE_ALIGNMENT)
1231     align = MAX_OFILE_ALIGNMENT;
1232   return align;
1233 }
1234
1235 /* The default implementation of
1236    TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT.  */
1237
1238 HOST_WIDE_INT
1239 default_preferred_vector_alignment (const_tree type)
1240 {
1241   return TYPE_ALIGN (type);
1242 }
1243
1244 /* By default assume vectors of element TYPE require a multiple of the natural
1245    alignment of TYPE.  TYPE is naturally aligned if IS_PACKED is false.  */
1246 bool
1247 default_builtin_vector_alignment_reachable (const_tree /*type*/, bool is_packed)
1248 {
1249   return ! is_packed;
1250 }
1251
1252 /* By default, assume that a target supports any factor of misalignment
1253    memory access if it supports movmisalign patten.
1254    is_packed is true if the memory access is defined in a packed struct.  */
1255 bool
1256 default_builtin_support_vector_misalignment (machine_mode mode,
1257                                              const_tree type
1258                                              ATTRIBUTE_UNUSED,
1259                                              int misalignment
1260                                              ATTRIBUTE_UNUSED,
1261                                              bool is_packed
1262                                              ATTRIBUTE_UNUSED)
1263 {
1264   if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1265     return true;
1266   return false;
1267 }
1268
1269 /* By default, only attempt to parallelize bitwise operations, and
1270    possibly adds/subtracts using bit-twiddling.  */
1271
1272 machine_mode
1273 default_preferred_simd_mode (scalar_mode)
1274 {
1275   return word_mode;
1276 }
1277
1278 /* By default only the size derived from the preferred vector mode
1279    is tried.  */
1280
1281 unsigned int
1282 default_autovectorize_vector_sizes (void)
1283 {
1284   return 0;
1285 }
1286
1287 /* By defaults a vector of integers is used as a mask.  */
1288
1289 opt_machine_mode
1290 default_get_mask_mode (unsigned nunits, unsigned vector_size)
1291 {
1292   unsigned elem_size = vector_size / nunits;
1293   scalar_int_mode elem_mode
1294     = smallest_int_mode_for_size (elem_size * BITS_PER_UNIT);
1295   machine_mode vector_mode;
1296
1297   gcc_assert (elem_size * nunits == vector_size);
1298
1299   if (mode_for_vector (elem_mode, nunits).exists (&vector_mode)
1300       && VECTOR_MODE_P (vector_mode)
1301       && targetm.vector_mode_supported_p (vector_mode))
1302     return vector_mode;
1303
1304   return opt_machine_mode ();
1305 }
1306
1307 /* By default, the cost model accumulates three separate costs (prologue,
1308    loop body, and epilogue) for a vectorized loop or block.  So allocate an
1309    array of three unsigned ints, set it to zero, and return its address.  */
1310
1311 void *
1312 default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED)
1313 {
1314   unsigned *cost = XNEWVEC (unsigned, 3);
1315   cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0;
1316   return cost;
1317 }
1318
1319 /* By default, the cost model looks up the cost of the given statement
1320    kind and mode, multiplies it by the occurrence count, accumulates
1321    it into the cost specified by WHERE, and returns the cost added.  */
1322
1323 unsigned
1324 default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
1325                        struct _stmt_vec_info *stmt_info, int misalign,
1326                        enum vect_cost_model_location where)
1327 {
1328   unsigned *cost = (unsigned *) data;
1329   unsigned retval = 0;
1330
1331   tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE;
1332   int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype,
1333                                                                 misalign);
1334    /* Statements in an inner loop relative to the loop being
1335       vectorized are weighted more heavily.  The value here is
1336       arbitrary and could potentially be improved with analysis.  */
1337   if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info))
1338     count *= 50;  /* FIXME.  */
1339
1340   retval = (unsigned) (count * stmt_cost);
1341   cost[where] += retval;
1342
1343   return retval;
1344 }
1345
1346 /* By default, the cost model just returns the accumulated costs.  */
1347
1348 void
1349 default_finish_cost (void *data, unsigned *prologue_cost,
1350                      unsigned *body_cost, unsigned *epilogue_cost)
1351 {
1352   unsigned *cost = (unsigned *) data;
1353   *prologue_cost = cost[vect_prologue];
1354   *body_cost     = cost[vect_body];
1355   *epilogue_cost = cost[vect_epilogue];
1356 }
1357
1358 /* Free the cost data.  */
1359
1360 void
1361 default_destroy_cost_data (void *data)
1362 {
1363   free (data);
1364 }
1365
1366 /* Determine whether or not a pointer mode is valid. Assume defaults
1367    of ptr_mode or Pmode - can be overridden.  */
1368 bool
1369 default_valid_pointer_mode (scalar_int_mode mode)
1370 {
1371   return (mode == ptr_mode || mode == Pmode);
1372 }
1373
1374 /* Determine whether the memory reference specified by REF may alias
1375    the C libraries errno location.  */
1376 bool
1377 default_ref_may_alias_errno (ao_ref *ref)
1378 {
1379   tree base = ao_ref_base (ref);
1380   /* The default implementation assumes the errno location is
1381      a declaration of type int or is always accessed via a
1382      pointer to int.  We assume that accesses to errno are
1383      not deliberately obfuscated (even in conforming ways).  */
1384   if (TYPE_UNSIGNED (TREE_TYPE (base))
1385       || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1386     return false;
1387   /* The default implementation assumes an errno location
1388      declaration is never defined in the current compilation unit.  */
1389   if (DECL_P (base)
1390       && !TREE_STATIC (base))
1391     return true;
1392   else if (TREE_CODE (base) == MEM_REF
1393            && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1394     {
1395       struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1396       return !pi || pi->pt.anything || pi->pt.nonlocal;
1397     }
1398   return false;
1399 }
1400
1401 /* Return the mode for a pointer to a given ADDRSPACE,
1402    defaulting to ptr_mode for all address spaces.  */
1403
1404 scalar_int_mode
1405 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1406 {
1407   return ptr_mode;
1408 }
1409
1410 /* Return the mode for an address in a given ADDRSPACE,
1411    defaulting to Pmode for all address spaces.  */
1412
1413 scalar_int_mode
1414 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1415 {
1416   return Pmode;
1417 }
1418
1419 /* Named address space version of valid_pointer_mode.
1420    To match the above, the same modes apply to all address spaces.  */
1421
1422 bool
1423 default_addr_space_valid_pointer_mode (scalar_int_mode mode,
1424                                        addr_space_t as ATTRIBUTE_UNUSED)
1425 {
1426   return targetm.valid_pointer_mode (mode);
1427 }
1428
1429 /* Some places still assume that all pointer or address modes are the
1430    standard Pmode and ptr_mode.  These optimizations become invalid if
1431    the target actually supports multiple different modes.  For now,
1432    we disable such optimizations on such targets, using this function.  */
1433
1434 bool
1435 target_default_pointer_address_modes_p (void)
1436 {
1437   if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1438     return false;
1439   if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1440     return false;
1441
1442   return true;
1443 }
1444
1445 /* Named address space version of legitimate_address_p.
1446    By default, all address spaces have the same form.  */
1447
1448 bool
1449 default_addr_space_legitimate_address_p (machine_mode mode, rtx mem,
1450                                          bool strict,
1451                                          addr_space_t as ATTRIBUTE_UNUSED)
1452 {
1453   return targetm.legitimate_address_p (mode, mem, strict);
1454 }
1455
1456 /* Named address space version of LEGITIMIZE_ADDRESS.
1457    By default, all address spaces have the same form.  */
1458
1459 rtx
1460 default_addr_space_legitimize_address (rtx x, rtx oldx, machine_mode mode,
1461                                        addr_space_t as ATTRIBUTE_UNUSED)
1462 {
1463   return targetm.legitimize_address (x, oldx, mode);
1464 }
1465
1466 /* The default hook for determining if one named address space is a subset of
1467    another and to return which address space to use as the common address
1468    space.  */
1469
1470 bool
1471 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1472 {
1473   return (subset == superset);
1474 }
1475
1476 /* The default hook for determining if 0 within a named address
1477    space is a valid address.  */
1478
1479 bool
1480 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED)
1481 {
1482   return false;
1483 }
1484
1485 /* The default hook for debugging the address space is to return the
1486    address space number to indicate DW_AT_address_class.  */
1487 int
1488 default_addr_space_debug (addr_space_t as)
1489 {
1490   return as;
1491 }
1492
1493 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1494    Don't complain about any address space.  */
1495
1496 void
1497 default_addr_space_diagnose_usage (addr_space_t, location_t)
1498 {
1499 }
1500
1501
1502 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1503    called for targets with only a generic address space.  */
1504
1505 rtx
1506 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1507                             tree from_type ATTRIBUTE_UNUSED,
1508                             tree to_type ATTRIBUTE_UNUSED)
1509 {
1510   gcc_unreachable ();
1511 }
1512
1513 /* The defualt implementation of TARGET_HARD_REGNO_NREGS.  */
1514
1515 unsigned int
1516 default_hard_regno_nregs (unsigned int, machine_mode mode)
1517 {
1518   return CEIL (GET_MODE_SIZE (mode), UNITS_PER_WORD);
1519 }
1520
1521 bool
1522 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1523 {
1524   return true;
1525 }
1526
1527 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P.  */
1528
1529 bool
1530 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED,
1531                                   addr_space_t addrspace ATTRIBUTE_UNUSED)
1532 {
1533   return false;
1534 }
1535
1536 bool
1537 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1538                                          tree ARG_UNUSED (name),
1539                                          tree ARG_UNUSED (args),
1540                                          int ARG_UNUSED (flags))
1541 {
1542   warning (OPT_Wattributes,
1543            "target attribute is not supported on this machine");
1544
1545   return false;
1546 }
1547
1548 bool
1549 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1550                                     tree ARG_UNUSED (pop_target))
1551 {
1552   /* If args is NULL the caller is handle_pragma_pop_options ().  In that case,
1553      emit no warning because "#pragma GCC pop_target" is valid on targets that
1554      do not have the "target" pragma.  */
1555   if (args)
1556     warning (OPT_Wpragmas,
1557              "#pragma GCC target is not supported for this machine");
1558
1559   return false;
1560 }
1561
1562 bool
1563 default_target_can_inline_p (tree caller, tree callee)
1564 {
1565   tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1566   tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1567   if (! callee_opts)
1568     callee_opts = target_option_default_node;
1569   if (! caller_opts)
1570     caller_opts = target_option_default_node;
1571
1572   /* If both caller and callee have attributes, assume that if the
1573      pointer is different, the two functions have different target
1574      options since build_target_option_node uses a hash table for the
1575      options.  */
1576   return callee_opts == caller_opts;
1577 }
1578
1579 /* If the machine does not have a case insn that compares the bounds,
1580    this means extra overhead for dispatch tables, which raises the
1581    threshold for using them.  */
1582
1583 unsigned int
1584 default_case_values_threshold (void)
1585 {
1586   return (targetm.have_casesi () ? 4 : 5);
1587 }
1588
1589 bool
1590 default_have_conditional_execution (void)
1591 {
1592   return HAVE_conditional_execution;
1593 }
1594
1595 /* By default we assume that c99 functions are present at the runtime,
1596    but sincos is not.  */
1597 bool
1598 default_libc_has_function (enum function_class fn_class)
1599 {
1600   if (fn_class == function_c94
1601       || fn_class == function_c99_misc
1602       || fn_class == function_c99_math_complex)
1603     return true;
1604
1605   return false;
1606 }
1607
1608 bool
1609 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1610 {
1611   return true;
1612 }
1613
1614 bool
1615 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1616 {
1617   return false;
1618 }
1619
1620 tree
1621 default_builtin_tm_load_store (tree ARG_UNUSED (type))
1622 {
1623   return NULL_TREE;
1624 }
1625
1626 /* Compute cost of moving registers to/from memory.  */
1627
1628 int
1629 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1630                           reg_class_t rclass ATTRIBUTE_UNUSED,
1631                           bool in ATTRIBUTE_UNUSED)
1632 {
1633 #ifndef MEMORY_MOVE_COST
1634     return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1635 #else
1636     return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in);
1637 #endif
1638 }
1639
1640 /* Compute cost of moving data from a register of class FROM to one of
1641    TO, using MODE.  */
1642
1643 int
1644 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1645                             reg_class_t from ATTRIBUTE_UNUSED,
1646                             reg_class_t to ATTRIBUTE_UNUSED)
1647 {
1648 #ifndef REGISTER_MOVE_COST
1649   return 2;
1650 #else
1651   return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to);
1652 #endif
1653 }
1654
1655 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS.  */
1656
1657 bool
1658 default_slow_unaligned_access (machine_mode, unsigned int)
1659 {
1660   return STRICT_ALIGNMENT;
1661 }
1662
1663 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1664    behavior.  SPEED_P is true if we are compiling for speed.  */
1665
1666 unsigned int
1667 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED)
1668 {
1669   unsigned int move_ratio;
1670 #ifdef MOVE_RATIO
1671   move_ratio = (unsigned int) MOVE_RATIO (speed_p);
1672 #else
1673 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1674   move_ratio = 2;
1675 #else /* No movmem patterns, pick a default.  */
1676   move_ratio = ((speed_p) ? 15 : 3);
1677 #endif
1678 #endif
1679   return move_ratio;
1680 }
1681
1682 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1683    used; return FALSE if the movmem/setmem optab should be expanded, or
1684    a call to memcpy emitted.  */
1685
1686 bool
1687 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
1688                                         unsigned int alignment,
1689                                         enum by_pieces_operation op,
1690                                         bool speed_p)
1691 {
1692   unsigned int max_size = 0;
1693   unsigned int ratio = 0;
1694
1695   switch (op)
1696     {
1697     case CLEAR_BY_PIECES:
1698       max_size = STORE_MAX_PIECES;
1699       ratio = CLEAR_RATIO (speed_p);
1700       break;
1701     case MOVE_BY_PIECES:
1702       max_size = MOVE_MAX_PIECES;
1703       ratio = get_move_ratio (speed_p);
1704       break;
1705     case SET_BY_PIECES:
1706       max_size = STORE_MAX_PIECES;
1707       ratio = SET_RATIO (speed_p);
1708       break;
1709     case STORE_BY_PIECES:
1710       max_size = STORE_MAX_PIECES;
1711       ratio = get_move_ratio (speed_p);
1712       break;
1713     case COMPARE_BY_PIECES:
1714       max_size = COMPARE_MAX_PIECES;
1715       /* Pick a likely default, just as in get_move_ratio.  */
1716       ratio = speed_p ? 15 : 3;
1717       break;
1718     }
1719
1720   return by_pieces_ninsns (size, alignment, max_size + 1, op) < ratio;
1721 }
1722
1723 /* This hook controls code generation for expanding a memcmp operation by
1724    pieces.  Return 1 for the normal pattern of compare/jump after each pair
1725    of loads, or a higher number to reduce the number of branches.  */
1726
1727 int
1728 default_compare_by_pieces_branch_ratio (machine_mode)
1729 {
1730   return 1;
1731 }
1732
1733 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1734    entry.  If RECORD_P is true and the target supports named sections,
1735    the location of the NOPs will be recorded in a special object section
1736    called "__patchable_function_entries".  This routine may be called
1737    twice per function to put NOPs before and after the function
1738    entry.  */
1739
1740 void
1741 default_print_patchable_function_entry (FILE *file,
1742                                         unsigned HOST_WIDE_INT patch_area_size,
1743                                         bool record_p)
1744 {
1745   const char *nop_templ = 0;
1746   int code_num;
1747   rtx_insn *my_nop = make_insn_raw (gen_nop ());
1748
1749   /* We use the template alone, relying on the (currently sane) assumption
1750      that the NOP template does not have variable operands.  */
1751   code_num = recog_memoized (my_nop);
1752   nop_templ = get_insn_template (code_num, my_nop);
1753
1754   if (record_p && targetm_common.have_named_sections)
1755     {
1756       char buf[256];
1757       static int patch_area_number;
1758       section *previous_section = in_section;
1759
1760       patch_area_number++;
1761       ASM_GENERATE_INTERNAL_LABEL (buf, "LPFE", patch_area_number);
1762
1763       switch_to_section (get_section ("__patchable_function_entries",
1764                                       0, NULL));
1765       fputs (integer_asm_op (POINTER_SIZE_UNITS, false), file);
1766       assemble_name_raw (file, buf);
1767       fputc ('\n', file);
1768
1769       switch_to_section (previous_section);
1770       ASM_OUTPUT_LABEL (file, buf);
1771     }
1772
1773   unsigned i;
1774   for (i = 0; i < patch_area_size; ++i)
1775     fprintf (file, "\t%s\n", nop_templ);
1776 }
1777
1778 bool
1779 default_profile_before_prologue (void)
1780 {
1781 #ifdef PROFILE_BEFORE_PROLOGUE
1782   return true;
1783 #else
1784   return false;
1785 #endif
1786 }
1787
1788 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS.  */
1789
1790 reg_class_t
1791 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1792                                 reg_class_t rclass)
1793 {
1794 #ifdef PREFERRED_RELOAD_CLASS
1795   return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1796 #else
1797   return rclass;
1798 #endif
1799 }
1800
1801 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS.  */
1802
1803 reg_class_t
1804 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1805                                        reg_class_t rclass)
1806 {
1807   return rclass;
1808 }
1809
1810 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS.  */
1811 reg_class_t
1812 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1813 {
1814   return NO_REGS;
1815 }
1816
1817 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P.  */
1818
1819 bool
1820 default_class_likely_spilled_p (reg_class_t rclass)
1821 {
1822   return (reg_class_size[(int) rclass] == 1);
1823 }
1824
1825 /* The default implementation of TARGET_CLASS_MAX_NREGS.  */
1826
1827 unsigned char
1828 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1829                          machine_mode mode ATTRIBUTE_UNUSED)
1830 {
1831 #ifdef CLASS_MAX_NREGS
1832   return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass, mode);
1833 #else
1834   return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD);
1835 #endif
1836 }
1837
1838 /* Determine the debugging unwind mechanism for the target.  */
1839
1840 enum unwind_info_type
1841 default_debug_unwind_info (void)
1842 {
1843   /* If the target wants to force the use of dwarf2 unwind info, let it.  */
1844   /* ??? Change all users to the hook, then poison this.  */
1845 #ifdef DWARF2_FRAME_INFO
1846   if (DWARF2_FRAME_INFO)
1847     return UI_DWARF2;
1848 #endif
1849
1850   /* Otherwise, only turn it on if dwarf2 debugging is enabled.  */
1851 #ifdef DWARF2_DEBUGGING_INFO
1852   if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1853     return UI_DWARF2;
1854 #endif
1855
1856   return UI_NONE;
1857 }
1858
1859 /* Determine the correct mode for a Dwarf frame register that represents
1860    register REGNO.  */
1861
1862 machine_mode
1863 default_dwarf_frame_reg_mode (int regno)
1864 {
1865   machine_mode save_mode = reg_raw_mode[regno];
1866
1867   if (targetm.hard_regno_call_part_clobbered (regno, save_mode))
1868     save_mode = choose_hard_reg_mode (regno, 1, true);
1869   return save_mode;
1870 }
1871
1872 /* To be used by targets where reg_raw_mode doesn't return the right
1873    mode for registers used in apply_builtin_return and apply_builtin_arg.  */
1874
1875 fixed_size_mode
1876 default_get_reg_raw_mode (int regno)
1877 {
1878   /* Targets must override this hook if the underlying register is
1879      variable-sized.  */
1880   return as_a <fixed_size_mode> (reg_raw_mode[regno]);
1881 }
1882
1883 /* Return true if a leaf function should stay leaf even with profiling
1884    enabled.  */
1885
1886 bool
1887 default_keep_leaf_when_profiled ()
1888 {
1889   return false;
1890 }
1891
1892 /* Return true if the state of option OPTION should be stored in PCH files
1893    and checked by default_pch_valid_p.  Store the option's current state
1894    in STATE if so.  */
1895
1896 static inline bool
1897 option_affects_pch_p (int option, struct cl_option_state *state)
1898 {
1899   if ((cl_options[option].flags & CL_TARGET) == 0)
1900     return false;
1901   if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
1902     return false;
1903   if (option_flag_var (option, &global_options) == &target_flags)
1904     if (targetm.check_pch_target_flags)
1905       return false;
1906   return get_option_state (&global_options, option, state);
1907 }
1908
1909 /* Default version of get_pch_validity.
1910    By default, every flag difference is fatal; that will be mostly right for
1911    most targets, but completely right for very few.  */
1912
1913 void *
1914 default_get_pch_validity (size_t *sz)
1915 {
1916   struct cl_option_state state;
1917   size_t i;
1918   char *result, *r;
1919
1920   *sz = 2;
1921   if (targetm.check_pch_target_flags)
1922     *sz += sizeof (target_flags);
1923   for (i = 0; i < cl_options_count; i++)
1924     if (option_affects_pch_p (i, &state))
1925       *sz += state.size;
1926
1927   result = r = XNEWVEC (char, *sz);
1928   r[0] = flag_pic;
1929   r[1] = flag_pie;
1930   r += 2;
1931   if (targetm.check_pch_target_flags)
1932     {
1933       memcpy (r, &target_flags, sizeof (target_flags));
1934       r += sizeof (target_flags);
1935     }
1936
1937   for (i = 0; i < cl_options_count; i++)
1938     if (option_affects_pch_p (i, &state))
1939       {
1940         memcpy (r, state.data, state.size);
1941         r += state.size;
1942       }
1943
1944   return result;
1945 }
1946
1947 /* Return a message which says that a PCH file was created with a different
1948    setting of OPTION.  */
1949
1950 static const char *
1951 pch_option_mismatch (const char *option)
1952 {
1953   return xasprintf (_("created and used with differing settings of '%s'"),
1954                     option);
1955 }
1956
1957 /* Default version of pch_valid_p.  */
1958
1959 const char *
1960 default_pch_valid_p (const void *data_p, size_t len)
1961 {
1962   struct cl_option_state state;
1963   const char *data = (const char *)data_p;
1964   size_t i;
1965
1966   /* -fpic and -fpie also usually make a PCH invalid.  */
1967   if (data[0] != flag_pic)
1968     return _("created and used with different settings of -fpic");
1969   if (data[1] != flag_pie)
1970     return _("created and used with different settings of -fpie");
1971   data += 2;
1972
1973   /* Check target_flags.  */
1974   if (targetm.check_pch_target_flags)
1975     {
1976       int tf;
1977       const char *r;
1978
1979       memcpy (&tf, data, sizeof (target_flags));
1980       data += sizeof (target_flags);
1981       len -= sizeof (target_flags);
1982       r = targetm.check_pch_target_flags (tf);
1983       if (r != NULL)
1984         return r;
1985     }
1986
1987   for (i = 0; i < cl_options_count; i++)
1988     if (option_affects_pch_p (i, &state))
1989       {
1990         if (memcmp (data, state.data, state.size) != 0)
1991           return pch_option_mismatch (cl_options[i].opt_text);
1992         data += state.size;
1993         len -= state.size;
1994       }
1995
1996   return NULL;
1997 }
1998
1999 /* Default version of cstore_mode.  */
2000
2001 scalar_int_mode
2002 default_cstore_mode (enum insn_code icode)
2003 {
2004   return as_a <scalar_int_mode> (insn_data[(int) icode].operand[0].mode);
2005 }
2006
2007 /* Default version of member_type_forces_blk.  */
2008
2009 bool
2010 default_member_type_forces_blk (const_tree, machine_mode)
2011 {
2012   return false;
2013 }
2014
2015 rtx
2016 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
2017                              rtx ptr ATTRIBUTE_UNUSED,
2018                              rtx bnd ATTRIBUTE_UNUSED)
2019 {
2020   gcc_unreachable ();
2021 }
2022
2023 void
2024 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
2025                               rtx addr ATTRIBUTE_UNUSED,
2026                               rtx bounds ATTRIBUTE_UNUSED,
2027                               rtx to ATTRIBUTE_UNUSED)
2028 {
2029   gcc_unreachable ();
2030 }
2031
2032 rtx
2033 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
2034 {
2035   gcc_unreachable ();
2036 }
2037
2038 void
2039 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
2040                                rtx bounds ATTRIBUTE_UNUSED)
2041 {
2042   gcc_unreachable ();
2043 }
2044
2045 /* Default version of canonicalize_comparison.  */
2046
2047 void
2048 default_canonicalize_comparison (int *, rtx *, rtx *, bool)
2049 {
2050 }
2051
2052 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV.  */
2053
2054 void
2055 default_atomic_assign_expand_fenv (tree *, tree *, tree *)
2056 {
2057 }
2058
2059 #ifndef PAD_VARARGS_DOWN
2060 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2061 #endif
2062
2063 /* Build an indirect-ref expression over the given TREE, which represents a
2064    piece of a va_arg() expansion.  */
2065 tree
2066 build_va_arg_indirect_ref (tree addr)
2067 {
2068   addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr);
2069   return addr;
2070 }
2071
2072 /* The "standard" implementation of va_arg: read the value from the
2073    current (padded) address and increment by the (padded) size.  */
2074
2075 tree
2076 std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
2077                           gimple_seq *post_p)
2078 {
2079   tree addr, t, type_size, rounded_size, valist_tmp;
2080   unsigned HOST_WIDE_INT align, boundary;
2081   bool indirect;
2082
2083   /* All of the alignment and movement below is for args-grow-up machines.
2084      As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2085      implement their own specialized gimplify_va_arg_expr routines.  */
2086   if (ARGS_GROW_DOWNWARD)
2087     gcc_unreachable ();
2088
2089   indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false);
2090   if (indirect)
2091     type = build_pointer_type (type);
2092
2093   align = PARM_BOUNDARY / BITS_PER_UNIT;
2094   boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
2095
2096   /* When we align parameter on stack for caller, if the parameter
2097      alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2098      aligned at MAX_SUPPORTED_STACK_ALIGNMENT.  We will match callee
2099      here with caller.  */
2100   if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
2101     boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
2102
2103   boundary /= BITS_PER_UNIT;
2104
2105   /* Hoist the valist value into a temporary for the moment.  */
2106   valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
2107
2108   /* va_list pointer is aligned to PARM_BOUNDARY.  If argument actually
2109      requires greater alignment, we must perform dynamic alignment.  */
2110   if (boundary > align
2111       && !integer_zerop (TYPE_SIZE (type)))
2112     {
2113       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2114                   fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
2115       gimplify_and_add (t, pre_p);
2116
2117       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2118                   fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
2119                                valist_tmp,
2120                                build_int_cst (TREE_TYPE (valist), -boundary)));
2121       gimplify_and_add (t, pre_p);
2122     }
2123   else
2124     boundary = align;
2125
2126   /* If the actual alignment is less than the alignment of the type,
2127      adjust the type accordingly so that we don't assume strict alignment
2128      when dereferencing the pointer.  */
2129   boundary *= BITS_PER_UNIT;
2130   if (boundary < TYPE_ALIGN (type))
2131     {
2132       type = build_variant_type_copy (type);
2133       SET_TYPE_ALIGN (type, boundary);
2134     }
2135
2136   /* Compute the rounded size of the type.  */
2137   type_size = size_in_bytes (type);
2138   rounded_size = round_up (type_size, align);
2139
2140   /* Reduce rounded_size so it's sharable with the postqueue.  */
2141   gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
2142
2143   /* Get AP.  */
2144   addr = valist_tmp;
2145   if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
2146     {
2147       /* Small args are padded downward.  */
2148       t = fold_build2_loc (input_location, GT_EXPR, sizetype,
2149                        rounded_size, size_int (align));
2150       t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
2151                        size_binop (MINUS_EXPR, rounded_size, type_size));
2152       addr = fold_build_pointer_plus (addr, t);
2153     }
2154
2155   /* Compute new value for AP.  */
2156   t = fold_build_pointer_plus (valist_tmp, rounded_size);
2157   t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
2158   gimplify_and_add (t, pre_p);
2159
2160   addr = fold_convert (build_pointer_type (type), addr);
2161
2162   if (indirect)
2163     addr = build_va_arg_indirect_ref (addr);
2164
2165   return build_va_arg_indirect_ref (addr);
2166 }
2167
2168 tree
2169 default_chkp_bound_type (void)
2170 {
2171   tree res = make_node (POINTER_BOUNDS_TYPE);
2172   TYPE_PRECISION (res) = TYPE_PRECISION (size_type_node) * 2;
2173   TYPE_NAME (res) = get_identifier ("__bounds_type");
2174   SET_TYPE_MODE (res, targetm.chkp_bound_mode ());
2175   layout_type (res);
2176   return res;
2177 }
2178
2179 machine_mode
2180 default_chkp_bound_mode (void)
2181 {
2182   return VOIDmode;
2183 }
2184
2185 tree
2186 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED)
2187 {
2188   return NULL_TREE;
2189 }
2190
2191 rtx
2192 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED,
2193                                     const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
2194                                     bool outgoing ATTRIBUTE_UNUSED)
2195 {
2196   gcc_unreachable ();
2197 }
2198
2199 tree
2200 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED,
2201                                    HOST_WIDE_INT ub ATTRIBUTE_UNUSED)
2202 {
2203   return NULL_TREE;
2204 }
2205
2206 int
2207 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED,
2208                                 tree lb ATTRIBUTE_UNUSED,
2209                                 tree ub ATTRIBUTE_UNUSED,
2210                                 tree *stmts ATTRIBUTE_UNUSED)
2211 {
2212   return 0;
2213 }
2214
2215 void
2216 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
2217                                       machine_mode mode ATTRIBUTE_UNUSED,
2218                                       tree type ATTRIBUTE_UNUSED,
2219                                       int *pretend_arg_size ATTRIBUTE_UNUSED,
2220                                       int second_time ATTRIBUTE_UNUSED)
2221 {
2222 }
2223
2224 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2225    not support nested low-overhead loops.  */
2226
2227 bool
2228 can_use_doloop_if_innermost (const widest_int &, const widest_int &,
2229                              unsigned int loop_depth, bool)
2230 {
2231   return loop_depth == 1;
2232 }
2233
2234 /* Default implementation of TARGET_OPTAB_SUPPORTED_P.  */
2235
2236 bool
2237 default_optab_supported_p (int, machine_mode, machine_mode, optimization_type)
2238 {
2239   return true;
2240 }
2241
2242 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST.  */
2243
2244 unsigned int
2245 default_max_noce_ifcvt_seq_cost (edge e)
2246 {
2247   bool predictable_p = predictable_edge_p (e);
2248
2249   enum compiler_param param
2250     = (predictable_p
2251        ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2252        : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST);
2253
2254   /* If we have a parameter set, use that, otherwise take a guess using
2255      BRANCH_COST.  */
2256   if (global_options_set.x_param_values[param])
2257     return PARAM_VALUE (param);
2258   else
2259     return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (3);
2260 }
2261
2262 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION.  */
2263
2264 unsigned int
2265 default_min_arithmetic_precision (void)
2266 {
2267   return WORD_REGISTER_OPERATIONS ? BITS_PER_WORD : BITS_PER_UNIT;
2268 }
2269
2270 /* Default implementation of TARGET_C_EXCESS_PRECISION.  */
2271
2272 enum flt_eval_method
2273 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED)
2274 {
2275   return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
2276 }
2277
2278 bool
2279 default_stack_clash_protection_final_dynamic_probe (rtx residual ATTRIBUTE_UNUSED)
2280 {
2281   return 0;
2282 }
2283
2284 #include "gt-targhooks.h"