gcc/targhooks.c

   1 /* Default target hook functions.
   2    Copyright (C) 2003-2019 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 /* The migration of target macros to target hooks works as follows:
  21
  22    1. Create a target hook that uses the existing target macros to
  23       implement the same functionality.
  24
  25    2. Convert all the MI files to use the hook instead of the macro.
  26
  27    3. Repeat for a majority of the remaining target macros.  This will
  28       take some time.
  29
  30    4. Tell target maintainers to start migrating.
  31
  32    5. Eventually convert the backends to override the hook instead of
  33       defining the macros.  This will take some time too.
  34
  35    6. TBD when, poison the macros.  Unmigrated targets will break at
  36       this point.
  37
  38    Note that we expect steps 1-3 to be done by the people that
  39    understand what the MI does with each macro, and step 5 to be done
  40    by the target maintainers for their respective targets.
  41
  42    Note that steps 1 and 2 don't have to be done together, but no
  43    target can override the new hook until step 2 is complete for it.
  44
  45    Once the macros are poisoned, we will revert to the old migration
  46    rules - migrate the macro, callers, and targets all at once.  This
  47    comment can thus be removed at that point.  */
  48
  49 #include "config.h"
  50 #include "system.h"
  51 #include "coretypes.h"
  52 #include "target.h"
  53 #include "function.h"
  54 #include "rtl.h"
  55 #include "tree.h"
  56 #include "tree-ssa-alias.h"
  57 #include "gimple-expr.h"
  58 #include "memmodel.h"
  59 #include "tm_p.h"
  60 #include "stringpool.h"
  61 #include "tree-vrp.h"
  62 #include "tree-ssanames.h"
  63 #include "profile-count.h"
  64 #include "optabs.h"
  65 #include "regs.h"
  66 #include "recog.h"
  67 #include "diagnostic-core.h"
  68 #include "fold-const.h"
  69 #include "stor-layout.h"
  70 #include "varasm.h"
  71 #include "flags.h"
  72 #include "explow.h"
  73 #include "calls.h"
  74 #include "expr.h"
  75 #include "output.h"
  76 #include "common/common-target.h"
  77 #include "reload.h"
  78 #include "intl.h"
  79 #include "opts.h"
  80 #include "gimplify.h"
  81 #include "predict.h"
  82 #include "params.h"
  83 #include "real.h"
  84 #include "langhooks.h"
  85 #include "sbitmap.h"
  86
  87 bool
  88 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED,
  89                               rtx addr ATTRIBUTE_UNUSED,
  90                               bool strict ATTRIBUTE_UNUSED)
  91 {
  92 #ifdef GO_IF_LEGITIMATE_ADDRESS
  93   /* Defer to the old implementation using a goto.  */
  94   if (strict)
  95     return strict_memory_address_p (mode, addr);
  96   else
  97     return memory_address_p (mode, addr);
  98 #else
  99   gcc_unreachable ();
 100 #endif
 101 }
 102
 103 void
 104 default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
 105 {
 106 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
 107   ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun);
 108 #endif
 109 }
 110
 111 int
 112 default_unspec_may_trap_p (const_rtx x, unsigned flags)
 113 {
 114   int i;
 115
 116   /* Any floating arithmetic may trap.  */
 117   if ((SCALAR_FLOAT_MODE_P (GET_MODE (x)) && flag_trapping_math))
 118     return 1;
 119
 120   for (i = 0; i < XVECLEN (x, 0); ++i)
 121     {
 122       if (may_trap_p_1 (XVECEXP (x, 0, i), flags))
 123         return 1;
 124     }
 125
 126   return 0;
 127 }
 128
 129 machine_mode
 130 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
 131                                machine_mode mode,
 132                                int *punsignedp ATTRIBUTE_UNUSED,
 133                                const_tree funtype ATTRIBUTE_UNUSED,
 134                                int for_return ATTRIBUTE_UNUSED)
 135 {
 136   if (type != NULL_TREE && for_return == 2)
 137     return promote_mode (type, mode, punsignedp);
 138   return mode;
 139 }
 140
 141 machine_mode
 142 default_promote_function_mode_always_promote (const_tree type,
 143                                               machine_mode mode,
 144                                               int *punsignedp,
 145                                               const_tree funtype ATTRIBUTE_UNUSED,
 146                                               int for_return ATTRIBUTE_UNUSED)
 147 {
 148   return promote_mode (type, mode, punsignedp);
 149 }
 150
 151 machine_mode
 152 default_cc_modes_compatible (machine_mode m1, machine_mode m2)
 153 {
 154   if (m1 == m2)
 155     return m1;
 156   return VOIDmode;
 157 }
 158
 159 bool
 160 default_return_in_memory (const_tree type,
 161                           const_tree fntype ATTRIBUTE_UNUSED)
 162 {
 163   return (TYPE_MODE (type) == BLKmode);
 164 }
 165
 166 rtx
 167 default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED,
 168                             machine_mode mode ATTRIBUTE_UNUSED)
 169 {
 170   return x;
 171 }
 172
 173 bool
 174 default_legitimize_address_displacement (rtx *, rtx *, poly_int64,
 175                                          machine_mode)
 176 {
 177   return false;
 178 }
 179
 180 bool
 181 default_const_not_ok_for_debug_p (rtx x)
 182 {
 183   if (GET_CODE (x) == UNSPEC)
 184     return true;
 185   return false;
 186 }
 187
 188 rtx
 189 default_expand_builtin_saveregs (void)
 190 {
 191   error ("%<__builtin_saveregs%> not supported by this target");
 192   return const0_rtx;
 193 }
 194
 195 void
 196 default_setup_incoming_varargs (cumulative_args_t,
 197                                 const function_arg_info &, int *, int)
 198 {
 199 }
 200
 201 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE.  */
 202
 203 rtx
 204 default_builtin_setjmp_frame_value (void)
 205 {
 206   return virtual_stack_vars_rtx;
 207 }
 208
 209 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false.  */
 210
 211 bool
 212 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED)
 213 {
 214   return false;
 215 }
 216
 217 bool
 218 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED)
 219 {
 220   return (targetm.calls.setup_incoming_varargs
 221           != default_setup_incoming_varargs);
 222 }
 223
 224 scalar_int_mode
 225 default_eh_return_filter_mode (void)
 226 {
 227   return targetm.unwind_word_mode ();
 228 }
 229
 230 scalar_int_mode
 231 default_libgcc_cmp_return_mode (void)
 232 {
 233   return word_mode;
 234 }
 235
 236 scalar_int_mode
 237 default_libgcc_shift_count_mode (void)
 238 {
 239   return word_mode;
 240 }
 241
 242 scalar_int_mode
 243 default_unwind_word_mode (void)
 244 {
 245   return word_mode;
 246 }
 247
 248 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK.  */
 249
 250 unsigned HOST_WIDE_INT
 251 default_shift_truncation_mask (machine_mode mode)
 252 {
 253   return SHIFT_COUNT_TRUNCATED ? GET_MODE_UNIT_BITSIZE (mode) - 1 : 0;
 254 }
 255
 256 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL.  */
 257
 258 unsigned int
 259 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED)
 260 {
 261   return have_insn_for (DIV, mode) ? 3 : 2;
 262 }
 263
 264 /* The default implementation of TARGET_MODE_REP_EXTENDED.  */
 265
 266 int
 267 default_mode_rep_extended (scalar_int_mode, scalar_int_mode)
 268 {
 269   return UNKNOWN;
 270 }
 271
 272 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true.  */
 273
 274 bool
 275 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED)
 276 {
 277   return true;
 278 }
 279
 280 /* Return machine mode for non-standard suffix
 281    or VOIDmode if non-standard suffixes are unsupported.  */
 282 machine_mode
 283 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED)
 284 {
 285   return VOIDmode;
 286 }
 287
 288 /* The generic C++ ABI specifies this is a 64-bit value.  */
 289 tree
 290 default_cxx_guard_type (void)
 291 {
 292   return long_long_integer_type_node;
 293 }
 294
 295 /* Returns the size of the cookie to use when allocating an array
 296    whose elements have the indicated TYPE.  Assumes that it is already
 297    known that a cookie is needed.  */
 298
 299 tree
 300 default_cxx_get_cookie_size (tree type)
 301 {
 302   tree cookie_size;
 303
 304   /* We need to allocate an additional max (sizeof (size_t), alignof
 305      (true_type)) bytes.  */
 306   tree sizetype_size;
 307   tree type_align;
 308
 309   sizetype_size = size_in_bytes (sizetype);
 310   type_align = size_int (TYPE_ALIGN_UNIT (type));
 311   if (tree_int_cst_lt (type_align, sizetype_size))
 312     cookie_size = sizetype_size;
 313   else
 314     cookie_size = type_align;
 315
 316   return cookie_size;
 317 }
 318
 319 /* Return true if a parameter must be passed by reference.  This version
 320    of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK.  */
 321
 322 bool
 323 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t,
 324                                            const function_arg_info &arg)
 325 {
 326   return targetm.calls.must_pass_in_stack (arg);
 327 }
 328
 329 /* Return true if a parameter follows callee copies conventions.  This
 330    version of the hook is true for all named arguments.  */
 331
 332 bool
 333 hook_callee_copies_named (cumulative_args_t, const function_arg_info &arg)
 334 {
 335   return arg.named;
 336 }
 337
 338 /* Emit to STREAM the assembler syntax for insn operand X.  */
 339
 340 void
 341 default_print_operand (FILE *stream ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
 342                        int code ATTRIBUTE_UNUSED)
 343 {
 344 #ifdef PRINT_OPERAND
 345   PRINT_OPERAND (stream, x, code);
 346 #else
 347   gcc_unreachable ();
 348 #endif
 349 }
 350
 351 /* Emit to STREAM the assembler syntax for an insn operand whose memory
 352    address is X.  */
 353
 354 void
 355 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED,
 356                                machine_mode /*mode*/,
 357                                rtx x ATTRIBUTE_UNUSED)
 358 {
 359 #ifdef PRINT_OPERAND_ADDRESS
 360   PRINT_OPERAND_ADDRESS (stream, x);
 361 #else
 362   gcc_unreachable ();
 363 #endif
 364 }
 365
 366 /* Return true if CODE is a valid punctuation character for the
 367    `print_operand' hook.  */
 368
 369 bool
 370 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED)
 371 {
 372 #ifdef PRINT_OPERAND_PUNCT_VALID_P
 373   return PRINT_OPERAND_PUNCT_VALID_P (code);
 374 #else
 375   return false;
 376 #endif
 377 }
 378
 379 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME.  */
 380 tree
 381 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED)
 382 {
 383   const char *skipped = name + (*name == '*' ? 1 : 0);
 384   const char *stripped = targetm.strip_name_encoding (skipped);
 385   if (*name != '*' && user_label_prefix[0])
 386     stripped = ACONCAT ((user_label_prefix, stripped, NULL));
 387   return get_identifier (stripped);
 388 }
 389
 390 /* The default implementation of TARGET_TRANSLATE_MODE_ATTRIBUTE.  */
 391
 392 machine_mode
 393 default_translate_mode_attribute (machine_mode mode)
 394 {
 395   return mode;
 396 }
 397
 398 /* True if MODE is valid for the target.  By "valid", we mean able to
 399    be manipulated in non-trivial ways.  In particular, this means all
 400    the arithmetic is supported.
 401
 402    By default we guess this means that any C type is supported.  If
 403    we can't map the mode back to a type that would be available in C,
 404    then reject it.  Special case, here, is the double-word arithmetic
 405    supported by optabs.c.  */
 406
 407 bool
 408 default_scalar_mode_supported_p (scalar_mode mode)
 409 {
 410   int precision = GET_MODE_PRECISION (mode);
 411
 412   switch (GET_MODE_CLASS (mode))
 413     {
 414     case MODE_PARTIAL_INT:
 415     case MODE_INT:
 416       if (precision == CHAR_TYPE_SIZE)
 417         return true;
 418       if (precision == SHORT_TYPE_SIZE)
 419         return true;
 420       if (precision == INT_TYPE_SIZE)
 421         return true;
 422       if (precision == LONG_TYPE_SIZE)
 423         return true;
 424       if (precision == LONG_LONG_TYPE_SIZE)
 425         return true;
 426       if (precision == 2 * BITS_PER_WORD)
 427         return true;
 428       return false;
 429
 430     case MODE_FLOAT:
 431       if (precision == FLOAT_TYPE_SIZE)
 432         return true;
 433       if (precision == DOUBLE_TYPE_SIZE)
 434         return true;
 435       if (precision == LONG_DOUBLE_TYPE_SIZE)
 436         return true;
 437       return false;
 438
 439     case MODE_DECIMAL_FLOAT:
 440     case MODE_FRACT:
 441     case MODE_UFRACT:
 442     case MODE_ACCUM:
 443     case MODE_UACCUM:
 444       return false;
 445
 446     default:
 447       gcc_unreachable ();
 448     }
 449 }
 450
 451 /* Return true if libgcc supports floating-point mode MODE (known to
 452    be supported as a scalar mode).  */
 453
 454 bool
 455 default_libgcc_floating_mode_supported_p (scalar_float_mode mode)
 456 {
 457   switch (mode)
 458     {
 459 #ifdef HAVE_SFmode
 460     case E_SFmode:
 461 #endif
 462 #ifdef HAVE_DFmode
 463     case E_DFmode:
 464 #endif
 465 #ifdef HAVE_XFmode
 466     case E_XFmode:
 467 #endif
 468 #ifdef HAVE_TFmode
 469     case E_TFmode:
 470 #endif
 471       return true;
 472
 473     default:
 474       return false;
 475     }
 476 }
 477
 478 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
 479    false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
 480    supported.  */
 481 opt_scalar_float_mode
 482 default_floatn_mode (int n, bool extended)
 483 {
 484   if (extended)
 485     {
 486       opt_scalar_float_mode cand1, cand2;
 487       scalar_float_mode mode;
 488       switch (n)
 489         {
 490         case 32:
 491 #ifdef HAVE_DFmode
 492           cand1 = DFmode;
 493 #endif
 494           break;
 495
 496         case 64:
 497 #ifdef HAVE_XFmode
 498           cand1 = XFmode;
 499 #endif
 500 #ifdef HAVE_TFmode
 501           cand2 = TFmode;
 502 #endif
 503           break;
 504
 505         case 128:
 506           break;
 507
 508         default:
 509           /* Those are the only valid _FloatNx types.  */
 510           gcc_unreachable ();
 511         }
 512       if (cand1.exists (&mode)
 513           && REAL_MODE_FORMAT (mode)->ieee_bits > n
 514           && targetm.scalar_mode_supported_p (mode)
 515           && targetm.libgcc_floating_mode_supported_p (mode))
 516         return cand1;
 517       if (cand2.exists (&mode)
 518           && REAL_MODE_FORMAT (mode)->ieee_bits > n
 519           && targetm.scalar_mode_supported_p (mode)
 520           && targetm.libgcc_floating_mode_supported_p (mode))
 521         return cand2;
 522     }
 523   else
 524     {
 525       opt_scalar_float_mode cand;
 526       scalar_float_mode mode;
 527       switch (n)
 528         {
 529         case 16:
 530           /* Always enable _Float16 if we have basic support for the mode.
 531              Targets can control the range and precision of operations on
 532              the _Float16 type using TARGET_C_EXCESS_PRECISION.  */
 533 #ifdef HAVE_HFmode
 534           cand = HFmode;
 535 #endif
 536           break;
 537
 538         case 32:
 539 #ifdef HAVE_SFmode
 540           cand = SFmode;
 541 #endif
 542           break;
 543
 544         case 64:
 545 #ifdef HAVE_DFmode
 546           cand = DFmode;
 547 #endif
 548           break;
 549
 550         case 128:
 551 #ifdef HAVE_TFmode
 552           cand = TFmode;
 553 #endif
 554           break;
 555
 556         default:
 557           break;
 558         }
 559       if (cand.exists (&mode)
 560           && REAL_MODE_FORMAT (mode)->ieee_bits == n
 561           && targetm.scalar_mode_supported_p (mode)
 562           && targetm.libgcc_floating_mode_supported_p (mode))
 563         return cand;
 564     }
 565   return opt_scalar_float_mode ();
 566 }
 567
 568 /* Define this to return true if the _Floatn and _Floatnx built-in functions
 569    should implicitly enable the built-in function without the __builtin_ prefix
 570    in addition to the normal built-in function with the __builtin_ prefix.  The
 571    default is to only enable built-in functions without the __builtin_ prefix
 572    for the GNU C langauge.  The argument FUNC is the enum builtin_in_function
 573    id of the function to be enabled.  */
 574
 575 bool
 576 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED)
 577 {
 578   static bool first_time_p = true;
 579   static bool c_or_objective_c;
 580
 581   if (first_time_p)
 582     {
 583       first_time_p = false;
 584       c_or_objective_c = lang_GNU_C () || lang_GNU_OBJC ();
 585     }
 586
 587   return c_or_objective_c;
 588 }
 589
 590 /* Make some target macros useable by target-independent code.  */
 591 bool
 592 targhook_words_big_endian (void)
 593 {
 594   return !!WORDS_BIG_ENDIAN;
 595 }
 596
 597 bool
 598 targhook_float_words_big_endian (void)
 599 {
 600   return !!FLOAT_WORDS_BIG_ENDIAN;
 601 }
 602
 603 /* True if the target supports floating-point exceptions and rounding
 604    modes.  */
 605
 606 bool
 607 default_float_exceptions_rounding_supported_p (void)
 608 {
 609 #ifdef HAVE_adddf3
 610   return HAVE_adddf3;
 611 #else
 612   return false;
 613 #endif
 614 }
 615
 616 /* True if the target supports decimal floating point.  */
 617
 618 bool
 619 default_decimal_float_supported_p (void)
 620 {
 621   return ENABLE_DECIMAL_FLOAT;
 622 }
 623
 624 /* True if the target supports fixed-point arithmetic.  */
 625
 626 bool
 627 default_fixed_point_supported_p (void)
 628 {
 629   return ENABLE_FIXED_POINT;
 630 }
 631
 632 /* True if the target supports GNU indirect functions.  */
 633
 634 bool
 635 default_has_ifunc_p (void)
 636 {
 637   return HAVE_GNU_INDIRECT_FUNCTION;
 638 }
 639
 640 /* Return true if we predict the loop LOOP will be transformed to a
 641    low-overhead loop, otherwise return false.
 642
 643    By default, false is returned, as this hook's applicability should be
 644    verified for each target.  Target maintainers should re-define the hook
 645    if the target can take advantage of it.  */
 646
 647 bool
 648 default_predict_doloop_p (class loop *loop ATTRIBUTE_UNUSED)
 649 {
 650   return false;
 651 }
 652
 653 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
 654    an error message.
 655
 656    This function checks whether a given INSN is valid within a low-overhead
 657    loop.  If INSN is invalid it returns the reason for that, otherwise it
 658    returns NULL. A called function may clobber any special registers required
 659    for low-overhead looping. Additionally, some targets (eg, PPC) use the count
 660    register for branch on table instructions. We reject the doloop pattern in
 661    these cases.  */
 662
 663 const char *
 664 default_invalid_within_doloop (const rtx_insn *insn)
 665 {
 666   if (CALL_P (insn))
 667     return "Function call in loop.";
 668
 669   if (tablejump_p (insn, NULL, NULL) || computed_jump_p (insn))
 670     return "Computed branch in the loop.";
 671
 672   return NULL;
 673 }
 674
 675 /* Mapping of builtin functions to vectorized variants.  */
 676
 677 tree
 678 default_builtin_vectorized_function (unsigned int, tree, tree)
 679 {
 680   return NULL_TREE;
 681 }
 682
 683 /* Mapping of target builtin functions to vectorized variants.  */
 684
 685 tree
 686 default_builtin_md_vectorized_function (tree, tree, tree)
 687 {
 688   return NULL_TREE;
 689 }
 690
 691 /* Vectorized conversion.  */
 692
 693 tree
 694 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
 695                                        tree dest_type ATTRIBUTE_UNUSED,
 696                                        tree src_type ATTRIBUTE_UNUSED)
 697 {
 698   return NULL_TREE;
 699 }
 700
 701 /* Default vectorizer cost model values.  */
 702
 703 int
 704 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
 705                                     tree vectype,
 706                                     int misalign ATTRIBUTE_UNUSED)
 707 {
 708   switch (type_of_cost)
 709     {
 710       case scalar_stmt:
 711       case scalar_load:
 712       case scalar_store:
 713       case vector_stmt:
 714       case vector_load:
 715       case vector_store:
 716       case vec_to_scalar:
 717       case scalar_to_vec:
 718       case cond_branch_not_taken:
 719       case vec_perm:
 720       case vec_promote_demote:
 721         return 1;
 722
 723       case unaligned_load:
 724       case unaligned_store:
 725         return 2;
 726
 727       case cond_branch_taken:
 728         return 3;
 729
 730       case vec_construct:
 731         return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype)) - 1;
 732
 733       default:
 734         gcc_unreachable ();
 735     }
 736 }
 737
 738 /* Reciprocal.  */
 739
 740 tree
 741 default_builtin_reciprocal (tree)
 742 {
 743   return NULL_TREE;
 744 }
 745
 746 bool
 747 hook_bool_CUMULATIVE_ARGS_arg_info_false (cumulative_args_t,
 748                                           const function_arg_info &)
 749 {
 750   return false;
 751 }
 752
 753 bool
 754 hook_bool_CUMULATIVE_ARGS_arg_info_true (cumulative_args_t,
 755                                          const function_arg_info &)
 756 {
 757   return true;
 758 }
 759
 760 int
 761 hook_int_CUMULATIVE_ARGS_arg_info_0 (cumulative_args_t,
 762                                      const function_arg_info &)
 763 {
 764   return 0;
 765 }
 766
 767 void
 768 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED,
 769                                 tree ATTRIBUTE_UNUSED)
 770 {
 771 }
 772
 773 void
 774 default_function_arg_advance (cumulative_args_t, const function_arg_info &)
 775 {
 776   gcc_unreachable ();
 777 }
 778
 779 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET.  */
 780
 781 HOST_WIDE_INT
 782 default_function_arg_offset (machine_mode, const_tree)
 783 {
 784   return 0;
 785 }
 786
 787 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
 788    upward, but pad short args downward on big-endian machines.  */
 789
 790 pad_direction
 791 default_function_arg_padding (machine_mode mode, const_tree type)
 792 {
 793   if (!BYTES_BIG_ENDIAN)
 794     return PAD_UPWARD;
 795
 796   unsigned HOST_WIDE_INT size;
 797   if (mode == BLKmode)
 798     {
 799       if (!type || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
 800         return PAD_UPWARD;
 801       size = int_size_in_bytes (type);
 802     }
 803   else
 804     /* Targets with variable-sized modes must override this hook
 805        and handle variable-sized modes explicitly.  */
 806     size = GET_MODE_SIZE (mode).to_constant ();
 807
 808   if (size < (PARM_BOUNDARY / BITS_PER_UNIT))
 809     return PAD_DOWNWARD;
 810
 811   return PAD_UPWARD;
 812 }
 813
 814 rtx
 815 default_function_arg (cumulative_args_t, const function_arg_info &)
 816 {
 817   gcc_unreachable ();
 818 }
 819
 820 rtx
 821 default_function_incoming_arg (cumulative_args_t, const function_arg_info &)
 822 {
 823   gcc_unreachable ();
 824 }
 825
 826 unsigned int
 827 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 828                                const_tree type ATTRIBUTE_UNUSED)
 829 {
 830   return PARM_BOUNDARY;
 831 }
 832
 833 unsigned int
 834 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 835                                      const_tree type ATTRIBUTE_UNUSED)
 836 {
 837   return PARM_BOUNDARY;
 838 }
 839
 840 void
 841 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
 842 {
 843 }
 844
 845 const char *
 846 hook_invalid_arg_for_unprototyped_fn (
 847         const_tree typelist ATTRIBUTE_UNUSED,
 848         const_tree funcdecl ATTRIBUTE_UNUSED,
 849         const_tree val ATTRIBUTE_UNUSED)
 850 {
 851   return NULL;
 852 }
 853
 854 /* Initialize the stack protection decls.  */
 855
 856 /* Stack protection related decls living in libgcc.  */
 857 static GTY(()) tree stack_chk_guard_decl;
 858
 859 tree
 860 default_stack_protect_guard (void)
 861 {
 862   tree t = stack_chk_guard_decl;
 863
 864   if (t == NULL)
 865     {
 866       rtx x;
 867
 868       t = build_decl (UNKNOWN_LOCATION,
 869                       VAR_DECL, get_identifier ("__stack_chk_guard"),
 870                       ptr_type_node);
 871       TREE_STATIC (t) = 1;
 872       TREE_PUBLIC (t) = 1;
 873       DECL_EXTERNAL (t) = 1;
 874       TREE_USED (t) = 1;
 875       TREE_THIS_VOLATILE (t) = 1;
 876       DECL_ARTIFICIAL (t) = 1;
 877       DECL_IGNORED_P (t) = 1;
 878
 879       /* Do not share RTL as the declaration is visible outside of
 880          current function.  */
 881       x = DECL_RTL (t);
 882       RTX_FLAG (x, used) = 1;
 883
 884       stack_chk_guard_decl = t;
 885     }
 886
 887   return t;
 888 }
 889
 890 static GTY(()) tree stack_chk_fail_decl;
 891
 892 tree
 893 default_external_stack_protect_fail (void)
 894 {
 895   tree t = stack_chk_fail_decl;
 896
 897   if (t == NULL_TREE)
 898     {
 899       t = build_function_type_list (void_type_node, NULL_TREE);
 900       t = build_decl (UNKNOWN_LOCATION,
 901                       FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
 902       TREE_STATIC (t) = 1;
 903       TREE_PUBLIC (t) = 1;
 904       DECL_EXTERNAL (t) = 1;
 905       TREE_USED (t) = 1;
 906       TREE_THIS_VOLATILE (t) = 1;
 907       TREE_NOTHROW (t) = 1;
 908       DECL_ARTIFICIAL (t) = 1;
 909       DECL_IGNORED_P (t) = 1;
 910       DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
 911       DECL_VISIBILITY_SPECIFIED (t) = 1;
 912
 913       stack_chk_fail_decl = t;
 914     }
 915
 916   return build_call_expr (t, 0);
 917 }
 918
 919 tree
 920 default_hidden_stack_protect_fail (void)
 921 {
 922 #ifndef HAVE_GAS_HIDDEN
 923   return default_external_stack_protect_fail ();
 924 #else
 925   tree t = stack_chk_fail_decl;
 926
 927   if (!flag_pic)
 928     return default_external_stack_protect_fail ();
 929
 930   if (t == NULL_TREE)
 931     {
 932       t = build_function_type_list (void_type_node, NULL_TREE);
 933       t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
 934                       get_identifier ("__stack_chk_fail_local"), t);
 935       TREE_STATIC (t) = 1;
 936       TREE_PUBLIC (t) = 1;
 937       DECL_EXTERNAL (t) = 1;
 938       TREE_USED (t) = 1;
 939       TREE_THIS_VOLATILE (t) = 1;
 940       TREE_NOTHROW (t) = 1;
 941       DECL_ARTIFICIAL (t) = 1;
 942       DECL_IGNORED_P (t) = 1;
 943       DECL_VISIBILITY_SPECIFIED (t) = 1;
 944       DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
 945
 946       stack_chk_fail_decl = t;
 947     }
 948
 949   return build_call_expr (t, 0);
 950 #endif
 951 }
 952
 953 bool
 954 hook_bool_const_rtx_commutative_p (const_rtx x,
 955                                    int outer_code ATTRIBUTE_UNUSED)
 956 {
 957   return COMMUTATIVE_P (x);
 958 }
 959
 960 rtx
 961 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
 962                         const_tree fn_decl_or_type,
 963                         bool outgoing ATTRIBUTE_UNUSED)
 964 {
 965   /* The old interface doesn't handle receiving the function type.  */
 966   if (fn_decl_or_type
 967       && !DECL_P (fn_decl_or_type))
 968     fn_decl_or_type = NULL;
 969
 970 #ifdef FUNCTION_VALUE
 971   return FUNCTION_VALUE (ret_type, fn_decl_or_type);
 972 #else
 973   gcc_unreachable ();
 974 #endif
 975 }
 976
 977 rtx
 978 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED,
 979                        const_rtx fun ATTRIBUTE_UNUSED)
 980 {
 981 #ifdef LIBCALL_VALUE
 982   return LIBCALL_VALUE (MACRO_MODE (mode));
 983 #else
 984   gcc_unreachable ();
 985 #endif
 986 }
 987
 988 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P.  */
 989
 990 bool
 991 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
 992 {
 993 #ifdef FUNCTION_VALUE_REGNO_P
 994   return FUNCTION_VALUE_REGNO_P (regno);
 995 #else
 996   gcc_unreachable ();
 997 #endif
 998 }
 999
1000 rtx
1001 default_internal_arg_pointer (void)
1002 {
1003   /* If the reg that the virtual arg pointer will be translated into is
1004      not a fixed reg or is the stack pointer, make a copy of the virtual
1005      arg pointer, and address parms via the copy.  The frame pointer is
1006      considered fixed even though it is not marked as such.  */
1007   if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
1008        || ! (fixed_regs[ARG_POINTER_REGNUM]
1009              || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
1010     return copy_to_reg (virtual_incoming_args_rtx);
1011   else
1012     return virtual_incoming_args_rtx;
1013 }
1014
1015 rtx
1016 default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
1017 {
1018   if (incoming_p)
1019     {
1020 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1021       return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
1022 #endif
1023     }
1024
1025 #ifdef STATIC_CHAIN_REGNUM
1026   return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
1027 #endif
1028
1029   {
1030     static bool issued_error;
1031     if (!issued_error)
1032       {
1033         issued_error = true;
1034         sorry ("nested functions not supported on this target");
1035       }
1036
1037     /* It really doesn't matter what we return here, so long at it
1038        doesn't cause the rest of the compiler to crash.  */
1039     return gen_rtx_MEM (Pmode, stack_pointer_rtx);
1040   }
1041 }
1042
1043 void
1044 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
1045                          rtx ARG_UNUSED (r_chain))
1046 {
1047   sorry ("nested function trampolines not supported on this target");
1048 }
1049
1050 poly_int64
1051 default_return_pops_args (tree, tree, poly_int64)
1052 {
1053   return 0;
1054 }
1055
1056 reg_class_t
1057 default_branch_target_register_class (void)
1058 {
1059   return NO_REGS;
1060 }
1061
1062 reg_class_t
1063 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED,
1064                                          reg_class_t cl,
1065                                          reg_class_t best_cl ATTRIBUTE_UNUSED)
1066 {
1067   return cl;
1068 }
1069
1070 extern bool
1071 default_lra_p (void)
1072 {
1073   return true;
1074 }
1075
1076 int
1077 default_register_priority (int hard_regno ATTRIBUTE_UNUSED)
1078 {
1079   return 0;
1080 }
1081
1082 extern bool
1083 default_register_usage_leveling_p (void)
1084 {
1085   return false;
1086 }
1087
1088 extern bool
1089 default_different_addr_displacement_p (void)
1090 {
1091   return false;
1092 }
1093
1094 reg_class_t
1095 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
1096                           reg_class_t reload_class_i ATTRIBUTE_UNUSED,
1097                           machine_mode reload_mode ATTRIBUTE_UNUSED,
1098                           secondary_reload_info *sri)
1099 {
1100   enum reg_class rclass = NO_REGS;
1101   enum reg_class reload_class = (enum reg_class) reload_class_i;
1102
1103   if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
1104     {
1105       sri->icode = sri->prev_sri->t_icode;
1106       return NO_REGS;
1107     }
1108 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1109   if (in_p)
1110     rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class,
1111                                            MACRO_MODE (reload_mode), x);
1112 #endif
1113 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1114   if (! in_p)
1115     rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class,
1116                                             MACRO_MODE (reload_mode), x);
1117 #endif
1118   if (rclass != NO_REGS)
1119     {
1120       enum insn_code icode
1121         = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
1122                                 reload_mode);
1123
1124       if (icode != CODE_FOR_nothing
1125           && !insn_operand_matches (icode, in_p, x))
1126         icode = CODE_FOR_nothing;
1127       else if (icode != CODE_FOR_nothing)
1128         {
1129           const char *insn_constraint, *scratch_constraint;
1130           enum reg_class insn_class, scratch_class;
1131
1132           gcc_assert (insn_data[(int) icode].n_operands == 3);
1133           insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
1134           if (!*insn_constraint)
1135             insn_class = ALL_REGS;
1136           else
1137             {
1138               if (in_p)
1139                 {
1140                   gcc_assert (*insn_constraint == '=');
1141                   insn_constraint++;
1142                 }
1143               insn_class = (reg_class_for_constraint
1144                             (lookup_constraint (insn_constraint)));
1145               gcc_assert (insn_class != NO_REGS);
1146             }
1147
1148           scratch_constraint = insn_data[(int) icode].operand[2].constraint;
1149           /* The scratch register's constraint must start with "=&",
1150              except for an input reload, where only "=" is necessary,
1151              and where it might be beneficial to re-use registers from
1152              the input.  */
1153           gcc_assert (scratch_constraint[0] == '='
1154                       && (in_p || scratch_constraint[1] == '&'));
1155           scratch_constraint++;
1156           if (*scratch_constraint == '&')
1157             scratch_constraint++;
1158           scratch_class = (reg_class_for_constraint
1159                            (lookup_constraint (scratch_constraint)));
1160
1161           if (reg_class_subset_p (reload_class, insn_class))
1162             {
1163               gcc_assert (scratch_class == rclass);
1164               rclass = NO_REGS;
1165             }
1166           else
1167             rclass = insn_class;
1168
1169         }
1170       if (rclass == NO_REGS)
1171         sri->icode = icode;
1172       else
1173         sri->t_icode = icode;
1174     }
1175   return rclass;
1176 }
1177
1178 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE.  */
1179
1180 machine_mode
1181 default_secondary_memory_needed_mode (machine_mode mode)
1182 {
1183   if (!targetm.lra_p ()
1184       && known_lt (GET_MODE_BITSIZE (mode), BITS_PER_WORD)
1185       && INTEGRAL_MODE_P (mode))
1186     return mode_for_size (BITS_PER_WORD, GET_MODE_CLASS (mode), 0).require ();
1187   return mode;
1188 }
1189
1190 /* By default, if flag_pic is true, then neither local nor global relocs
1191    should be placed in readonly memory.  */
1192
1193 int
1194 default_reloc_rw_mask (void)
1195 {
1196   return flag_pic ? 3 : 0;
1197 }
1198
1199 /* By default, address diff vectors are generated
1200 for jump tables when flag_pic is true.  */
1201
1202 bool
1203 default_generate_pic_addr_diff_vec (void)
1204 {
1205   return flag_pic;
1206 }
1207
1208 /* By default, do no modification. */
1209 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
1210                                          tree id)
1211 {
1212    return id;
1213 }
1214
1215 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT.  */
1216
1217 HOST_WIDE_INT
1218 default_static_rtx_alignment (machine_mode mode)
1219 {
1220   return GET_MODE_ALIGNMENT (mode);
1221 }
1222
1223 /* The default implementation of TARGET_CONSTANT_ALIGNMENT.  */
1224
1225 HOST_WIDE_INT
1226 default_constant_alignment (const_tree, HOST_WIDE_INT align)
1227 {
1228   return align;
1229 }
1230
1231 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1232    to at least BITS_PER_WORD but otherwise makes no changes.  */
1233
1234 HOST_WIDE_INT
1235 constant_alignment_word_strings (const_tree exp, HOST_WIDE_INT align)
1236 {
1237   if (TREE_CODE (exp) == STRING_CST)
1238     return MAX (align, BITS_PER_WORD);
1239   return align;
1240 }
1241
1242 /* Default to natural alignment for vector types, bounded by
1243    MAX_OFILE_ALIGNMENT.  */
1244
1245 HOST_WIDE_INT
1246 default_vector_alignment (const_tree type)
1247 {
1248   unsigned HOST_WIDE_INT align = MAX_OFILE_ALIGNMENT;
1249   tree size = TYPE_SIZE (type);
1250   if (tree_fits_uhwi_p (size))
1251     align = tree_to_uhwi (size);
1252
1253   return align < MAX_OFILE_ALIGNMENT ? align : MAX_OFILE_ALIGNMENT;
1254 }
1255
1256 /* The default implementation of
1257    TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT.  */
1258
1259 poly_uint64
1260 default_preferred_vector_alignment (const_tree type)
1261 {
1262   return TYPE_ALIGN (type);
1263 }
1264
1265 /* By default assume vectors of element TYPE require a multiple of the natural
1266    alignment of TYPE.  TYPE is naturally aligned if IS_PACKED is false.  */
1267 bool
1268 default_builtin_vector_alignment_reachable (const_tree /*type*/, bool is_packed)
1269 {
1270   return ! is_packed;
1271 }
1272
1273 /* By default, assume that a target supports any factor of misalignment
1274    memory access if it supports movmisalign patten.
1275    is_packed is true if the memory access is defined in a packed struct.  */
1276 bool
1277 default_builtin_support_vector_misalignment (machine_mode mode,
1278                                              const_tree type
1279                                              ATTRIBUTE_UNUSED,
1280                                              int misalignment
1281                                              ATTRIBUTE_UNUSED,
1282                                              bool is_packed
1283                                              ATTRIBUTE_UNUSED)
1284 {
1285   if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1286     return true;
1287   return false;
1288 }
1289
1290 /* By default, only attempt to parallelize bitwise operations, and
1291    possibly adds/subtracts using bit-twiddling.  */
1292
1293 machine_mode
1294 default_preferred_simd_mode (scalar_mode)
1295 {
1296   return word_mode;
1297 }
1298
1299 /* By default do not split reductions further.  */
1300
1301 machine_mode
1302 default_split_reduction (machine_mode mode)
1303 {
1304   return mode;
1305 }
1306
1307 /* By default only the size derived from the preferred vector mode
1308    is tried.  */
1309
1310 void
1311 default_autovectorize_vector_sizes (vector_sizes *, bool)
1312 {
1313 }
1314
1315 /* By default a vector of integers is used as a mask.  */
1316
1317 opt_machine_mode
1318 default_get_mask_mode (poly_uint64 nunits, poly_uint64 vector_size)
1319 {
1320   unsigned int elem_size = vector_element_size (vector_size, nunits);
1321   scalar_int_mode elem_mode
1322     = smallest_int_mode_for_size (elem_size * BITS_PER_UNIT);
1323   machine_mode vector_mode;
1324
1325   gcc_assert (known_eq (elem_size * nunits, vector_size));
1326
1327   if (mode_for_vector (elem_mode, nunits).exists (&vector_mode)
1328       && VECTOR_MODE_P (vector_mode)
1329       && targetm.vector_mode_supported_p (vector_mode))
1330     return vector_mode;
1331
1332   return opt_machine_mode ();
1333 }
1334
1335 /* By default consider masked stores to be expensive.  */
1336
1337 bool
1338 default_empty_mask_is_expensive (unsigned ifn)
1339 {
1340   return ifn == IFN_MASK_STORE;
1341 }
1342
1343 /* By default, the cost model accumulates three separate costs (prologue,
1344    loop body, and epilogue) for a vectorized loop or block.  So allocate an
1345    array of three unsigned ints, set it to zero, and return its address.  */
1346
1347 void *
1348 default_init_cost (class loop *loop_info ATTRIBUTE_UNUSED)
1349 {
1350   unsigned *cost = XNEWVEC (unsigned, 3);
1351   cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0;
1352   return cost;
1353 }
1354
1355 /* By default, the cost model looks up the cost of the given statement
1356    kind and mode, multiplies it by the occurrence count, accumulates
1357    it into the cost specified by WHERE, and returns the cost added.  */
1358
1359 unsigned
1360 default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
1361                        class _stmt_vec_info *stmt_info, int misalign,
1362                        enum vect_cost_model_location where)
1363 {
1364   unsigned *cost = (unsigned *) data;
1365   unsigned retval = 0;
1366
1367   tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE;
1368   int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype,
1369                                                                 misalign);
1370    /* Statements in an inner loop relative to the loop being
1371       vectorized are weighted more heavily.  The value here is
1372       arbitrary and could potentially be improved with analysis.  */
1373   if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info))
1374     count *= 50;  /* FIXME.  */
1375
1376   retval = (unsigned) (count * stmt_cost);
1377   cost[where] += retval;
1378
1379   return retval;
1380 }
1381
1382 /* By default, the cost model just returns the accumulated costs.  */
1383
1384 void
1385 default_finish_cost (void *data, unsigned *prologue_cost,
1386                      unsigned *body_cost, unsigned *epilogue_cost)
1387 {
1388   unsigned *cost = (unsigned *) data;
1389   *prologue_cost = cost[vect_prologue];
1390   *body_cost     = cost[vect_body];
1391   *epilogue_cost = cost[vect_epilogue];
1392 }
1393
1394 /* Free the cost data.  */
1395
1396 void
1397 default_destroy_cost_data (void *data)
1398 {
1399   free (data);
1400 }
1401
1402 /* Determine whether or not a pointer mode is valid. Assume defaults
1403    of ptr_mode or Pmode - can be overridden.  */
1404 bool
1405 default_valid_pointer_mode (scalar_int_mode mode)
1406 {
1407   return (mode == ptr_mode || mode == Pmode);
1408 }
1409
1410 /* Determine whether the memory reference specified by REF may alias
1411    the C libraries errno location.  */
1412 bool
1413 default_ref_may_alias_errno (ao_ref *ref)
1414 {
1415   tree base = ao_ref_base (ref);
1416   /* The default implementation assumes the errno location is
1417      a declaration of type int or is always accessed via a
1418      pointer to int.  We assume that accesses to errno are
1419      not deliberately obfuscated (even in conforming ways).  */
1420   if (TYPE_UNSIGNED (TREE_TYPE (base))
1421       || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1422     return false;
1423   /* The default implementation assumes an errno location
1424      declaration is never defined in the current compilation unit.  */
1425   if (DECL_P (base)
1426       && !TREE_STATIC (base))
1427     return true;
1428   else if (TREE_CODE (base) == MEM_REF
1429            && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1430     {
1431       struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1432       return !pi || pi->pt.anything || pi->pt.nonlocal;
1433     }
1434   return false;
1435 }
1436
1437 /* Return the mode for a pointer to a given ADDRSPACE,
1438    defaulting to ptr_mode for all address spaces.  */
1439
1440 scalar_int_mode
1441 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1442 {
1443   return ptr_mode;
1444 }
1445
1446 /* Return the mode for an address in a given ADDRSPACE,
1447    defaulting to Pmode for all address spaces.  */
1448
1449 scalar_int_mode
1450 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1451 {
1452   return Pmode;
1453 }
1454
1455 /* Named address space version of valid_pointer_mode.
1456    To match the above, the same modes apply to all address spaces.  */
1457
1458 bool
1459 default_addr_space_valid_pointer_mode (scalar_int_mode mode,
1460                                        addr_space_t as ATTRIBUTE_UNUSED)
1461 {
1462   return targetm.valid_pointer_mode (mode);
1463 }
1464
1465 /* Some places still assume that all pointer or address modes are the
1466    standard Pmode and ptr_mode.  These optimizations become invalid if
1467    the target actually supports multiple different modes.  For now,
1468    we disable such optimizations on such targets, using this function.  */
1469
1470 bool
1471 target_default_pointer_address_modes_p (void)
1472 {
1473   if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1474     return false;
1475   if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1476     return false;
1477
1478   return true;
1479 }
1480
1481 /* Named address space version of legitimate_address_p.
1482    By default, all address spaces have the same form.  */
1483
1484 bool
1485 default_addr_space_legitimate_address_p (machine_mode mode, rtx mem,
1486                                          bool strict,
1487                                          addr_space_t as ATTRIBUTE_UNUSED)
1488 {
1489   return targetm.legitimate_address_p (mode, mem, strict);
1490 }
1491
1492 /* Named address space version of LEGITIMIZE_ADDRESS.
1493    By default, all address spaces have the same form.  */
1494
1495 rtx
1496 default_addr_space_legitimize_address (rtx x, rtx oldx, machine_mode mode,
1497                                        addr_space_t as ATTRIBUTE_UNUSED)
1498 {
1499   return targetm.legitimize_address (x, oldx, mode);
1500 }
1501
1502 /* The default hook for determining if one named address space is a subset of
1503    another and to return which address space to use as the common address
1504    space.  */
1505
1506 bool
1507 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1508 {
1509   return (subset == superset);
1510 }
1511
1512 /* The default hook for determining if 0 within a named address
1513    space is a valid address.  */
1514
1515 bool
1516 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED)
1517 {
1518   return false;
1519 }
1520
1521 /* The default hook for debugging the address space is to return the
1522    address space number to indicate DW_AT_address_class.  */
1523 int
1524 default_addr_space_debug (addr_space_t as)
1525 {
1526   return as;
1527 }
1528
1529 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1530    Don't complain about any address space.  */
1531
1532 void
1533 default_addr_space_diagnose_usage (addr_space_t, location_t)
1534 {
1535 }
1536
1537
1538 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1539    called for targets with only a generic address space.  */
1540
1541 rtx
1542 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1543                             tree from_type ATTRIBUTE_UNUSED,
1544                             tree to_type ATTRIBUTE_UNUSED)
1545 {
1546   gcc_unreachable ();
1547 }
1548
1549 /* The defualt implementation of TARGET_HARD_REGNO_NREGS.  */
1550
1551 unsigned int
1552 default_hard_regno_nregs (unsigned int, machine_mode mode)
1553 {
1554   /* Targets with variable-sized modes must provide their own definition
1555      of this hook.  */
1556   return CEIL (GET_MODE_SIZE (mode).to_constant (), UNITS_PER_WORD);
1557 }
1558
1559 bool
1560 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1561 {
1562   return true;
1563 }
1564
1565 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P.  */
1566
1567 bool
1568 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED,
1569                                   addr_space_t addrspace ATTRIBUTE_UNUSED)
1570 {
1571   return false;
1572 }
1573
1574 bool
1575 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1576                                          tree ARG_UNUSED (name),
1577                                          tree ARG_UNUSED (args),
1578                                          int ARG_UNUSED (flags))
1579 {
1580   warning (OPT_Wattributes,
1581            "target attribute is not supported on this machine");
1582
1583   return false;
1584 }
1585
1586 bool
1587 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1588                                     tree ARG_UNUSED (pop_target))
1589 {
1590   /* If args is NULL the caller is handle_pragma_pop_options ().  In that case,
1591      emit no warning because "#pragma GCC pop_target" is valid on targets that
1592      do not have the "target" pragma.  */
1593   if (args)
1594     warning (OPT_Wpragmas,
1595              "%<#pragma GCC target%> is not supported for this machine");
1596
1597   return false;
1598 }
1599
1600 bool
1601 default_target_can_inline_p (tree caller, tree callee)
1602 {
1603   tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1604   tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1605   if (! callee_opts)
1606     callee_opts = target_option_default_node;
1607   if (! caller_opts)
1608     caller_opts = target_option_default_node;
1609
1610   /* If both caller and callee have attributes, assume that if the
1611      pointer is different, the two functions have different target
1612      options since build_target_option_node uses a hash table for the
1613      options.  */
1614   return callee_opts == caller_opts;
1615 }
1616
1617 /* If the machine does not have a case insn that compares the bounds,
1618    this means extra overhead for dispatch tables, which raises the
1619    threshold for using them.  */
1620
1621 unsigned int
1622 default_case_values_threshold (void)
1623 {
1624   return (targetm.have_casesi () ? 4 : 5);
1625 }
1626
1627 bool
1628 default_have_conditional_execution (void)
1629 {
1630   return HAVE_conditional_execution;
1631 }
1632
1633 /* By default we assume that c99 functions are present at the runtime,
1634    but sincos is not.  */
1635 bool
1636 default_libc_has_function (enum function_class fn_class)
1637 {
1638   if (fn_class == function_c94
1639       || fn_class == function_c99_misc
1640       || fn_class == function_c99_math_complex)
1641     return true;
1642
1643   return false;
1644 }
1645
1646 /* By default assume that libc has not a fast implementation.  */
1647
1648 bool
1649 default_libc_has_fast_function (int fcode ATTRIBUTE_UNUSED)
1650 {
1651   return false;
1652 }
1653
1654 bool
1655 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1656 {
1657   return true;
1658 }
1659
1660 bool
1661 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1662 {
1663   return false;
1664 }
1665
1666 tree
1667 default_builtin_tm_load_store (tree ARG_UNUSED (type))
1668 {
1669   return NULL_TREE;
1670 }
1671
1672 /* Compute cost of moving registers to/from memory.  */
1673
1674 int
1675 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1676                           reg_class_t rclass ATTRIBUTE_UNUSED,
1677                           bool in ATTRIBUTE_UNUSED)
1678 {
1679 #ifndef MEMORY_MOVE_COST
1680     return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1681 #else
1682     return MEMORY_MOVE_COST (MACRO_MODE (mode), (enum reg_class) rclass, in);
1683 #endif
1684 }
1685
1686 /* Compute cost of moving data from a register of class FROM to one of
1687    TO, using MODE.  */
1688
1689 int
1690 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1691                             reg_class_t from ATTRIBUTE_UNUSED,
1692                             reg_class_t to ATTRIBUTE_UNUSED)
1693 {
1694 #ifndef REGISTER_MOVE_COST
1695   return 2;
1696 #else
1697   return REGISTER_MOVE_COST (MACRO_MODE (mode),
1698                              (enum reg_class) from, (enum reg_class) to);
1699 #endif
1700 }
1701
1702 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS.  */
1703
1704 bool
1705 default_slow_unaligned_access (machine_mode, unsigned int)
1706 {
1707   return STRICT_ALIGNMENT;
1708 }
1709
1710 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE.  */
1711
1712 HOST_WIDE_INT
1713 default_estimated_poly_value (poly_int64 x)
1714 {
1715   return x.coeffs[0];
1716 }
1717
1718 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1719    behavior.  SPEED_P is true if we are compiling for speed.  */
1720
1721 unsigned int
1722 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED)
1723 {
1724   unsigned int move_ratio;
1725 #ifdef MOVE_RATIO
1726   move_ratio = (unsigned int) MOVE_RATIO (speed_p);
1727 #else
1728 #if defined (HAVE_cpymemqi) || defined (HAVE_cpymemhi) || defined (HAVE_cpymemsi) || defined (HAVE_cpymemdi) || defined (HAVE_cpymemti)
1729   move_ratio = 2;
1730 #else /* No cpymem patterns, pick a default.  */
1731   move_ratio = ((speed_p) ? 15 : 3);
1732 #endif
1733 #endif
1734   return move_ratio;
1735 }
1736
1737 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1738    used; return FALSE if the cpymem/setmem optab should be expanded, or
1739    a call to memcpy emitted.  */
1740
1741 bool
1742 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
1743                                         unsigned int alignment,
1744                                         enum by_pieces_operation op,
1745                                         bool speed_p)
1746 {
1747   unsigned int max_size = 0;
1748   unsigned int ratio = 0;
1749
1750   switch (op)
1751     {
1752     case CLEAR_BY_PIECES:
1753       max_size = STORE_MAX_PIECES;
1754       ratio = CLEAR_RATIO (speed_p);
1755       break;
1756     case MOVE_BY_PIECES:
1757       max_size = MOVE_MAX_PIECES;
1758       ratio = get_move_ratio (speed_p);
1759       break;
1760     case SET_BY_PIECES:
1761       max_size = STORE_MAX_PIECES;
1762       ratio = SET_RATIO (speed_p);
1763       break;
1764     case STORE_BY_PIECES:
1765       max_size = STORE_MAX_PIECES;
1766       ratio = get_move_ratio (speed_p);
1767       break;
1768     case COMPARE_BY_PIECES:
1769       max_size = COMPARE_MAX_PIECES;
1770       /* Pick a likely default, just as in get_move_ratio.  */
1771       ratio = speed_p ? 15 : 3;
1772       break;
1773     }
1774
1775   return by_pieces_ninsns (size, alignment, max_size + 1, op) < ratio;
1776 }
1777
1778 /* This hook controls code generation for expanding a memcmp operation by
1779    pieces.  Return 1 for the normal pattern of compare/jump after each pair
1780    of loads, or a higher number to reduce the number of branches.  */
1781
1782 int
1783 default_compare_by_pieces_branch_ratio (machine_mode)
1784 {
1785   return 1;
1786 }
1787
1788 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1789    entry.  If RECORD_P is true and the target supports named sections,
1790    the location of the NOPs will be recorded in a special object section
1791    called "__patchable_function_entries".  This routine may be called
1792    twice per function to put NOPs before and after the function
1793    entry.  */
1794
1795 void
1796 default_print_patchable_function_entry (FILE *file,
1797                                         unsigned HOST_WIDE_INT patch_area_size,
1798                                         bool record_p)
1799 {
1800   const char *nop_templ = 0;
1801   int code_num;
1802   rtx_insn *my_nop = make_insn_raw (gen_nop ());
1803
1804   /* We use the template alone, relying on the (currently sane) assumption
1805      that the NOP template does not have variable operands.  */
1806   code_num = recog_memoized (my_nop);
1807   nop_templ = get_insn_template (code_num, my_nop);
1808
1809   if (record_p && targetm_common.have_named_sections)
1810     {
1811       char buf[256];
1812       static int patch_area_number;
1813       section *previous_section = in_section;
1814       const char *asm_op = integer_asm_op (POINTER_SIZE_UNITS, false);
1815
1816       gcc_assert (asm_op != NULL);
1817       patch_area_number++;
1818       ASM_GENERATE_INTERNAL_LABEL (buf, "LPFE", patch_area_number);
1819
1820       switch_to_section (get_section ("__patchable_function_entries",
1821                                       SECTION_WRITE | SECTION_RELRO, NULL));
1822       fputs (asm_op, file);
1823       assemble_name_raw (file, buf);
1824       fputc ('\n', file);
1825
1826       switch_to_section (previous_section);
1827       ASM_OUTPUT_LABEL (file, buf);
1828     }
1829
1830   unsigned i;
1831   for (i = 0; i < patch_area_size; ++i)
1832     fprintf (file, "\t%s\n", nop_templ);
1833 }
1834
1835 bool
1836 default_profile_before_prologue (void)
1837 {
1838 #ifdef PROFILE_BEFORE_PROLOGUE
1839   return true;
1840 #else
1841   return false;
1842 #endif
1843 }
1844
1845 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS.  */
1846
1847 reg_class_t
1848 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1849                                 reg_class_t rclass)
1850 {
1851 #ifdef PREFERRED_RELOAD_CLASS
1852   return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1853 #else
1854   return rclass;
1855 #endif
1856 }
1857
1858 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS.  */
1859
1860 reg_class_t
1861 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1862                                        reg_class_t rclass)
1863 {
1864   return rclass;
1865 }
1866
1867 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS.  */
1868 reg_class_t
1869 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1870 {
1871   return NO_REGS;
1872 }
1873
1874 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P.  */
1875
1876 bool
1877 default_class_likely_spilled_p (reg_class_t rclass)
1878 {
1879   return (reg_class_size[(int) rclass] == 1);
1880 }
1881
1882 /* The default implementation of TARGET_CLASS_MAX_NREGS.  */
1883
1884 unsigned char
1885 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1886                          machine_mode mode ATTRIBUTE_UNUSED)
1887 {
1888 #ifdef CLASS_MAX_NREGS
1889   return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass,
1890                                           MACRO_MODE (mode));
1891 #else
1892   /* Targets with variable-sized modes must provide their own definition
1893      of this hook.  */
1894   unsigned int size = GET_MODE_SIZE (mode).to_constant ();
1895   return (size + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
1896 #endif
1897 }
1898
1899 /* Determine the debugging unwind mechanism for the target.  */
1900
1901 enum unwind_info_type
1902 default_debug_unwind_info (void)
1903 {
1904   /* If the target wants to force the use of dwarf2 unwind info, let it.  */
1905   /* ??? Change all users to the hook, then poison this.  */
1906 #ifdef DWARF2_FRAME_INFO
1907   if (DWARF2_FRAME_INFO)
1908     return UI_DWARF2;
1909 #endif
1910
1911   /* Otherwise, only turn it on if dwarf2 debugging is enabled.  */
1912 #ifdef DWARF2_DEBUGGING_INFO
1913   if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1914     return UI_DWARF2;
1915 #endif
1916
1917   return UI_NONE;
1918 }
1919
1920 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1921    must define this hook.  */
1922
1923 unsigned int
1924 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1925 {
1926   gcc_unreachable ();
1927 }
1928
1929 /* Determine the correct mode for a Dwarf frame register that represents
1930    register REGNO.  */
1931
1932 machine_mode
1933 default_dwarf_frame_reg_mode (int regno)
1934 {
1935   machine_mode save_mode = reg_raw_mode[regno];
1936
1937   if (targetm.hard_regno_call_part_clobbered (NULL, regno, save_mode))
1938     save_mode = choose_hard_reg_mode (regno, 1, true);
1939   return save_mode;
1940 }
1941
1942 /* To be used by targets where reg_raw_mode doesn't return the right
1943    mode for registers used in apply_builtin_return and apply_builtin_arg.  */
1944
1945 fixed_size_mode
1946 default_get_reg_raw_mode (int regno)
1947 {
1948   /* Targets must override this hook if the underlying register is
1949      variable-sized.  */
1950   return as_a <fixed_size_mode> (reg_raw_mode[regno]);
1951 }
1952
1953 /* Return true if a leaf function should stay leaf even with profiling
1954    enabled.  */
1955
1956 bool
1957 default_keep_leaf_when_profiled ()
1958 {
1959   return false;
1960 }
1961
1962 /* Return true if the state of option OPTION should be stored in PCH files
1963    and checked by default_pch_valid_p.  Store the option's current state
1964    in STATE if so.  */
1965
1966 static inline bool
1967 option_affects_pch_p (int option, struct cl_option_state *state)
1968 {
1969   if ((cl_options[option].flags & CL_TARGET) == 0)
1970     return false;
1971   if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
1972     return false;
1973   if (option_flag_var (option, &global_options) == &target_flags)
1974     if (targetm.check_pch_target_flags)
1975       return false;
1976   return get_option_state (&global_options, option, state);
1977 }
1978
1979 /* Default version of get_pch_validity.
1980    By default, every flag difference is fatal; that will be mostly right for
1981    most targets, but completely right for very few.  */
1982
1983 void *
1984 default_get_pch_validity (size_t *sz)
1985 {
1986   struct cl_option_state state;
1987   size_t i;
1988   char *result, *r;
1989
1990   *sz = 2;
1991   if (targetm.check_pch_target_flags)
1992     *sz += sizeof (target_flags);
1993   for (i = 0; i < cl_options_count; i++)
1994     if (option_affects_pch_p (i, &state))
1995       *sz += state.size;
1996
1997   result = r = XNEWVEC (char, *sz);
1998   r[0] = flag_pic;
1999   r[1] = flag_pie;
2000   r += 2;
2001   if (targetm.check_pch_target_flags)
2002     {
2003       memcpy (r, &target_flags, sizeof (target_flags));
2004       r += sizeof (target_flags);
2005     }
2006
2007   for (i = 0; i < cl_options_count; i++)
2008     if (option_affects_pch_p (i, &state))
2009       {
2010         memcpy (r, state.data, state.size);
2011         r += state.size;
2012       }
2013
2014   return result;
2015 }
2016
2017 /* Return a message which says that a PCH file was created with a different
2018    setting of OPTION.  */
2019
2020 static const char *
2021 pch_option_mismatch (const char *option)
2022 {
2023   return xasprintf (_("created and used with differing settings of '%s'"),
2024                     option);
2025 }
2026
2027 /* Default version of pch_valid_p.  */
2028
2029 const char *
2030 default_pch_valid_p (const void *data_p, size_t len)
2031 {
2032   struct cl_option_state state;
2033   const char *data = (const char *)data_p;
2034   size_t i;
2035
2036   /* -fpic and -fpie also usually make a PCH invalid.  */
2037   if (data[0] != flag_pic)
2038     return _("created and used with different settings of %<-fpic%>");
2039   if (data[1] != flag_pie)
2040     return _("created and used with different settings of %<-fpie%>");
2041   data += 2;
2042
2043   /* Check target_flags.  */
2044   if (targetm.check_pch_target_flags)
2045     {
2046       int tf;
2047       const char *r;
2048
2049       memcpy (&tf, data, sizeof (target_flags));
2050       data += sizeof (target_flags);
2051       len -= sizeof (target_flags);
2052       r = targetm.check_pch_target_flags (tf);
2053       if (r != NULL)
2054         return r;
2055     }
2056
2057   for (i = 0; i < cl_options_count; i++)
2058     if (option_affects_pch_p (i, &state))
2059       {
2060         if (memcmp (data, state.data, state.size) != 0)
2061           return pch_option_mismatch (cl_options[i].opt_text);
2062         data += state.size;
2063         len -= state.size;
2064       }
2065
2066   return NULL;
2067 }
2068
2069 /* Default version of cstore_mode.  */
2070
2071 scalar_int_mode
2072 default_cstore_mode (enum insn_code icode)
2073 {
2074   return as_a <scalar_int_mode> (insn_data[(int) icode].operand[0].mode);
2075 }
2076
2077 /* Default version of member_type_forces_blk.  */
2078
2079 bool
2080 default_member_type_forces_blk (const_tree, machine_mode)
2081 {
2082   return false;
2083 }
2084
2085 rtx
2086 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
2087                              rtx ptr ATTRIBUTE_UNUSED,
2088                              rtx bnd ATTRIBUTE_UNUSED)
2089 {
2090   gcc_unreachable ();
2091 }
2092
2093 void
2094 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
2095                               rtx addr ATTRIBUTE_UNUSED,
2096                               rtx bounds ATTRIBUTE_UNUSED,
2097                               rtx to ATTRIBUTE_UNUSED)
2098 {
2099   gcc_unreachable ();
2100 }
2101
2102 rtx
2103 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
2104 {
2105   gcc_unreachable ();
2106 }
2107
2108 void
2109 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
2110                                rtx bounds ATTRIBUTE_UNUSED)
2111 {
2112   gcc_unreachable ();
2113 }
2114
2115 /* Default version of canonicalize_comparison.  */
2116
2117 void
2118 default_canonicalize_comparison (int *, rtx *, rtx *, bool)
2119 {
2120 }
2121
2122 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV.  */
2123
2124 void
2125 default_atomic_assign_expand_fenv (tree *, tree *, tree *)
2126 {
2127 }
2128
2129 #ifndef PAD_VARARGS_DOWN
2130 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2131 #endif
2132
2133 /* Build an indirect-ref expression over the given TREE, which represents a
2134    piece of a va_arg() expansion.  */
2135 tree
2136 build_va_arg_indirect_ref (tree addr)
2137 {
2138   addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr);
2139   return addr;
2140 }
2141
2142 /* The "standard" implementation of va_arg: read the value from the
2143    current (padded) address and increment by the (padded) size.  */
2144
2145 tree
2146 std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
2147                           gimple_seq *post_p)
2148 {
2149   tree addr, t, type_size, rounded_size, valist_tmp;
2150   unsigned HOST_WIDE_INT align, boundary;
2151   bool indirect;
2152
2153   /* All of the alignment and movement below is for args-grow-up machines.
2154      As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2155      implement their own specialized gimplify_va_arg_expr routines.  */
2156   if (ARGS_GROW_DOWNWARD)
2157     gcc_unreachable ();
2158
2159   indirect = pass_va_arg_by_reference (type);
2160   if (indirect)
2161     type = build_pointer_type (type);
2162
2163   if (targetm.calls.split_complex_arg
2164       && TREE_CODE (type) == COMPLEX_TYPE
2165       && targetm.calls.split_complex_arg (type))
2166     {
2167       tree real_part, imag_part;
2168
2169       real_part = std_gimplify_va_arg_expr (valist,
2170                                             TREE_TYPE (type), pre_p, NULL);
2171       real_part = get_initialized_tmp_var (real_part, pre_p, NULL);
2172
2173       imag_part = std_gimplify_va_arg_expr (unshare_expr (valist),
2174                                             TREE_TYPE (type), pre_p, NULL);
2175       imag_part = get_initialized_tmp_var (imag_part, pre_p, NULL);
2176
2177       return build2 (COMPLEX_EXPR, type, real_part, imag_part);
2178    }
2179
2180   align = PARM_BOUNDARY / BITS_PER_UNIT;
2181   boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
2182
2183   /* When we align parameter on stack for caller, if the parameter
2184      alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2185      aligned at MAX_SUPPORTED_STACK_ALIGNMENT.  We will match callee
2186      here with caller.  */
2187   if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
2188     boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
2189
2190   boundary /= BITS_PER_UNIT;
2191
2192   /* Hoist the valist value into a temporary for the moment.  */
2193   valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
2194
2195   /* va_list pointer is aligned to PARM_BOUNDARY.  If argument actually
2196      requires greater alignment, we must perform dynamic alignment.  */
2197   if (boundary > align
2198       && !TYPE_EMPTY_P (type)
2199       && !integer_zerop (TYPE_SIZE (type)))
2200     {
2201       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2202                   fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
2203       gimplify_and_add (t, pre_p);
2204
2205       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2206                   fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
2207                                valist_tmp,
2208                                build_int_cst (TREE_TYPE (valist), -boundary)));
2209       gimplify_and_add (t, pre_p);
2210     }
2211   else
2212     boundary = align;
2213
2214   /* If the actual alignment is less than the alignment of the type,
2215      adjust the type accordingly so that we don't assume strict alignment
2216      when dereferencing the pointer.  */
2217   boundary *= BITS_PER_UNIT;
2218   if (boundary < TYPE_ALIGN (type))
2219     {
2220       type = build_variant_type_copy (type);
2221       SET_TYPE_ALIGN (type, boundary);
2222     }
2223
2224   /* Compute the rounded size of the type.  */
2225   type_size = arg_size_in_bytes (type);
2226   rounded_size = round_up (type_size, align);
2227
2228   /* Reduce rounded_size so it's sharable with the postqueue.  */
2229   gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
2230
2231   /* Get AP.  */
2232   addr = valist_tmp;
2233   if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
2234     {
2235       /* Small args are padded downward.  */
2236       t = fold_build2_loc (input_location, GT_EXPR, sizetype,
2237                        rounded_size, size_int (align));
2238       t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
2239                        size_binop (MINUS_EXPR, rounded_size, type_size));
2240       addr = fold_build_pointer_plus (addr, t);
2241     }
2242
2243   /* Compute new value for AP.  */
2244   t = fold_build_pointer_plus (valist_tmp, rounded_size);
2245   t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
2246   gimplify_and_add (t, pre_p);
2247
2248   addr = fold_convert (build_pointer_type (type), addr);
2249
2250   if (indirect)
2251     addr = build_va_arg_indirect_ref (addr);
2252
2253   return build_va_arg_indirect_ref (addr);
2254 }
2255
2256 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2257    not support nested low-overhead loops.  */
2258
2259 bool
2260 can_use_doloop_if_innermost (const widest_int &, const widest_int &,
2261                              unsigned int loop_depth, bool)
2262 {
2263   return loop_depth == 1;
2264 }
2265
2266 /* Default implementation of TARGET_OPTAB_SUPPORTED_P.  */
2267
2268 bool
2269 default_optab_supported_p (int, machine_mode, machine_mode, optimization_type)
2270 {
2271   return true;
2272 }
2273
2274 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST.  */
2275
2276 unsigned int
2277 default_max_noce_ifcvt_seq_cost (edge e)
2278 {
2279   bool predictable_p = predictable_edge_p (e);
2280
2281   enum compiler_param param
2282     = (predictable_p
2283        ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2284        : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST);
2285
2286   /* If we have a parameter set, use that, otherwise take a guess using
2287      BRANCH_COST.  */
2288   if (global_options_set.x_param_values[param])
2289     return PARAM_VALUE (param);
2290   else
2291     return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (3);
2292 }
2293
2294 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION.  */
2295
2296 unsigned int
2297 default_min_arithmetic_precision (void)
2298 {
2299   return WORD_REGISTER_OPERATIONS ? BITS_PER_WORD : BITS_PER_UNIT;
2300 }
2301
2302 /* Default implementation of TARGET_C_EXCESS_PRECISION.  */
2303
2304 enum flt_eval_method
2305 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED)
2306 {
2307   return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
2308 }
2309
2310 /* Default implementation for
2311   TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE.  */
2312 HOST_WIDE_INT
2313 default_stack_clash_protection_alloca_probe_range (void)
2314 {
2315   return 0;
2316 }
2317
2318 /* The default implementation of TARGET_EARLY_REMAT_MODES.  */
2319
2320 void
2321 default_select_early_remat_modes (sbitmap)
2322 {
2323 }
2324
2325 /* The default implementation of TARGET_PREFERRED_ELSE_VALUE.  */
2326
2327 tree
2328 default_preferred_else_value (unsigned, tree type, unsigned, tree *)
2329 {
2330   return build_zero_cst (type);
2331 }
2332
2333 /* Default implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE.  */
2334 bool
2335 default_have_speculation_safe_value (bool active ATTRIBUTE_UNUSED)
2336 {
2337 #ifdef HAVE_speculation_barrier
2338   return active ? HAVE_speculation_barrier : true;
2339 #else
2340   return false;
2341 #endif
2342 }
2343 /* Alternative implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE
2344    that can be used on targets that never have speculative execution.  */
2345 bool
2346 speculation_safe_value_not_needed (bool active)
2347 {
2348   return !active;
2349 }
2350
2351 /* Default implementation of the speculation-safe-load builtin.  This
2352    implementation simply copies val to result and generates a
2353    speculation_barrier insn, if such a pattern is defined.  */
2354 rtx
2355 default_speculation_safe_value (machine_mode mode ATTRIBUTE_UNUSED,
2356                                 rtx result, rtx val,
2357                                 rtx failval ATTRIBUTE_UNUSED)
2358 {
2359   emit_move_insn (result, val);
2360
2361 #ifdef HAVE_speculation_barrier
2362   /* Assume the target knows what it is doing: if it defines a
2363      speculation barrier, but it is not enabled, then assume that one
2364      isn't needed.  */
2365   if (HAVE_speculation_barrier)
2366     emit_insn (gen_speculation_barrier ());
2367 #endif
2368
2369   return result;
2370 }
2371
2372 void
2373 default_remove_extra_call_preserved_regs (rtx_insn *, HARD_REG_SET *)
2374 {
2375 }
2376
2377 #include "gt-targhooks.h"