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
  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 /* Make some target macros useable by target-independent code.  */
 567 bool
 568 targhook_words_big_endian (void)
 569 {
 570   return !!WORDS_BIG_ENDIAN;
 571 }
 572
 573 bool
 574 targhook_float_words_big_endian (void)
 575 {
 576   return !!FLOAT_WORDS_BIG_ENDIAN;
 577 }
 578
 579 /* True if the target supports floating-point exceptions and rounding
 580    modes.  */
 581
 582 bool
 583 default_float_exceptions_rounding_supported_p (void)
 584 {
 585 #ifdef HAVE_adddf3
 586   return HAVE_adddf3;
 587 #else
 588   return false;
 589 #endif
 590 }
 591
 592 /* True if the target supports decimal floating point.  */
 593
 594 bool
 595 default_decimal_float_supported_p (void)
 596 {
 597   return ENABLE_DECIMAL_FLOAT;
 598 }
 599
 600 /* True if the target supports fixed-point arithmetic.  */
 601
 602 bool
 603 default_fixed_point_supported_p (void)
 604 {
 605   return ENABLE_FIXED_POINT;
 606 }
 607
 608 /* True if the target supports GNU indirect functions.  */
 609
 610 bool
 611 default_has_ifunc_p (void)
 612 {
 613   return HAVE_GNU_INDIRECT_FUNCTION;
 614 }
 615
 616 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
 617    an error message.
 618
 619    This function checks whether a given INSN is valid within a low-overhead
 620    loop.  If INSN is invalid it returns the reason for that, otherwise it
 621    returns NULL. A called function may clobber any special registers required
 622    for low-overhead looping. Additionally, some targets (eg, PPC) use the count
 623    register for branch on table instructions. We reject the doloop pattern in
 624    these cases.  */
 625
 626 const char *
 627 default_invalid_within_doloop (const rtx_insn *insn)
 628 {
 629   if (CALL_P (insn))
 630     return "Function call in loop.";
 631
 632   if (tablejump_p (insn, NULL, NULL) || computed_jump_p (insn))
 633     return "Computed branch in the loop.";
 634
 635   return NULL;
 636 }
 637
 638 /* Mapping of builtin functions to vectorized variants.  */
 639
 640 tree
 641 default_builtin_vectorized_function (unsigned int, tree, tree)
 642 {
 643   return NULL_TREE;
 644 }
 645
 646 /* Mapping of target builtin functions to vectorized variants.  */
 647
 648 tree
 649 default_builtin_md_vectorized_function (tree, tree, tree)
 650 {
 651   return NULL_TREE;
 652 }
 653
 654 /* Vectorized conversion.  */
 655
 656 tree
 657 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
 658                                        tree dest_type ATTRIBUTE_UNUSED,
 659                                        tree src_type ATTRIBUTE_UNUSED)
 660 {
 661   return NULL_TREE;
 662 }
 663
 664 /* Default vectorizer cost model values.  */
 665
 666 int
 667 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
 668                                     tree vectype,
 669                                     int misalign ATTRIBUTE_UNUSED)
 670 {
 671   switch (type_of_cost)
 672     {
 673       case scalar_stmt:
 674       case scalar_load:
 675       case scalar_store:
 676       case vector_stmt:
 677       case vector_load:
 678       case vector_store:
 679       case vec_to_scalar:
 680       case scalar_to_vec:
 681       case cond_branch_not_taken:
 682       case vec_perm:
 683       case vec_promote_demote:
 684         return 1;
 685
 686       case unaligned_load:
 687       case unaligned_store:
 688         return 2;
 689
 690       case cond_branch_taken:
 691         return 3;
 692
 693       case vec_construct:
 694         return TYPE_VECTOR_SUBPARTS (vectype) - 1;
 695
 696       default:
 697         gcc_unreachable ();
 698     }
 699 }
 700
 701 /* Reciprocal.  */
 702
 703 tree
 704 default_builtin_reciprocal (tree)
 705 {
 706   return NULL_TREE;
 707 }
 708
 709 bool
 710 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
 711         cumulative_args_t ca ATTRIBUTE_UNUSED,
 712         machine_mode mode ATTRIBUTE_UNUSED,
 713         const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 714 {
 715   return false;
 716 }
 717
 718 bool
 719 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
 720         cumulative_args_t ca ATTRIBUTE_UNUSED,
 721         machine_mode mode ATTRIBUTE_UNUSED,
 722         const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 723 {
 724   return true;
 725 }
 726
 727 int
 728 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
 729         cumulative_args_t ca ATTRIBUTE_UNUSED,
 730         machine_mode mode ATTRIBUTE_UNUSED,
 731         tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 732 {
 733   return 0;
 734 }
 735
 736 void
 737 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED,
 738                               machine_mode mode ATTRIBUTE_UNUSED,
 739                               const_tree type ATTRIBUTE_UNUSED,
 740                               bool named ATTRIBUTE_UNUSED)
 741 {
 742   gcc_unreachable ();
 743 }
 744
 745 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET.  */
 746
 747 HOST_WIDE_INT
 748 default_function_arg_offset (machine_mode, const_tree)
 749 {
 750   return 0;
 751 }
 752
 753 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
 754    upward, but pad short args downward on big-endian machines.  */
 755
 756 pad_direction
 757 default_function_arg_padding (machine_mode mode, const_tree type)
 758 {
 759   if (!BYTES_BIG_ENDIAN)
 760     return PAD_UPWARD;
 761
 762   unsigned HOST_WIDE_INT size;
 763   if (mode == BLKmode)
 764     {
 765       if (!type || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
 766         return PAD_UPWARD;
 767       size = int_size_in_bytes (type);
 768     }
 769   else
 770     size = GET_MODE_SIZE (mode);
 771
 772   if (size < (PARM_BOUNDARY / BITS_PER_UNIT))
 773     return PAD_DOWNWARD;
 774
 775   return PAD_UPWARD;
 776 }
 777
 778 rtx
 779 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 780                       machine_mode mode ATTRIBUTE_UNUSED,
 781                       const_tree type ATTRIBUTE_UNUSED,
 782                       bool named ATTRIBUTE_UNUSED)
 783 {
 784   gcc_unreachable ();
 785 }
 786
 787 rtx
 788 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 789                                machine_mode mode ATTRIBUTE_UNUSED,
 790                                const_tree type ATTRIBUTE_UNUSED,
 791                                bool named ATTRIBUTE_UNUSED)
 792 {
 793   gcc_unreachable ();
 794 }
 795
 796 unsigned int
 797 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 798                                const_tree type ATTRIBUTE_UNUSED)
 799 {
 800   return PARM_BOUNDARY;
 801 }
 802
 803 unsigned int
 804 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 805                                      const_tree type ATTRIBUTE_UNUSED)
 806 {
 807   return PARM_BOUNDARY;
 808 }
 809
 810 void
 811 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
 812 {
 813 }
 814
 815 const char *
 816 hook_invalid_arg_for_unprototyped_fn (
 817         const_tree typelist ATTRIBUTE_UNUSED,
 818         const_tree funcdecl ATTRIBUTE_UNUSED,
 819         const_tree val ATTRIBUTE_UNUSED)
 820 {
 821   return NULL;
 822 }
 823
 824 /* Initialize the stack protection decls.  */
 825
 826 /* Stack protection related decls living in libgcc.  */
 827 static GTY(()) tree stack_chk_guard_decl;
 828
 829 tree
 830 default_stack_protect_guard (void)
 831 {
 832   tree t = stack_chk_guard_decl;
 833
 834   if (t == NULL)
 835     {
 836       rtx x;
 837
 838       t = build_decl (UNKNOWN_LOCATION,
 839                       VAR_DECL, get_identifier ("__stack_chk_guard"),
 840                       ptr_type_node);
 841       TREE_STATIC (t) = 1;
 842       TREE_PUBLIC (t) = 1;
 843       DECL_EXTERNAL (t) = 1;
 844       TREE_USED (t) = 1;
 845       TREE_THIS_VOLATILE (t) = 1;
 846       DECL_ARTIFICIAL (t) = 1;
 847       DECL_IGNORED_P (t) = 1;
 848
 849       /* Do not share RTL as the declaration is visible outside of
 850          current function.  */
 851       x = DECL_RTL (t);
 852       RTX_FLAG (x, used) = 1;
 853
 854       stack_chk_guard_decl = t;
 855     }
 856
 857   return t;
 858 }
 859
 860 static GTY(()) tree stack_chk_fail_decl;
 861
 862 tree
 863 default_external_stack_protect_fail (void)
 864 {
 865   tree t = stack_chk_fail_decl;
 866
 867   if (t == NULL_TREE)
 868     {
 869       t = build_function_type_list (void_type_node, NULL_TREE);
 870       t = build_decl (UNKNOWN_LOCATION,
 871                       FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
 872       TREE_STATIC (t) = 1;
 873       TREE_PUBLIC (t) = 1;
 874       DECL_EXTERNAL (t) = 1;
 875       TREE_USED (t) = 1;
 876       TREE_THIS_VOLATILE (t) = 1;
 877       TREE_NOTHROW (t) = 1;
 878       DECL_ARTIFICIAL (t) = 1;
 879       DECL_IGNORED_P (t) = 1;
 880       DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
 881       DECL_VISIBILITY_SPECIFIED (t) = 1;
 882
 883       stack_chk_fail_decl = t;
 884     }
 885
 886   return build_call_expr (t, 0);
 887 }
 888
 889 tree
 890 default_hidden_stack_protect_fail (void)
 891 {
 892 #ifndef HAVE_GAS_HIDDEN
 893   return default_external_stack_protect_fail ();
 894 #else
 895   tree t = stack_chk_fail_decl;
 896
 897   if (!flag_pic)
 898     return default_external_stack_protect_fail ();
 899
 900   if (t == NULL_TREE)
 901     {
 902       t = build_function_type_list (void_type_node, NULL_TREE);
 903       t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
 904                       get_identifier ("__stack_chk_fail_local"), t);
 905       TREE_STATIC (t) = 1;
 906       TREE_PUBLIC (t) = 1;
 907       DECL_EXTERNAL (t) = 1;
 908       TREE_USED (t) = 1;
 909       TREE_THIS_VOLATILE (t) = 1;
 910       TREE_NOTHROW (t) = 1;
 911       DECL_ARTIFICIAL (t) = 1;
 912       DECL_IGNORED_P (t) = 1;
 913       DECL_VISIBILITY_SPECIFIED (t) = 1;
 914       DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
 915
 916       stack_chk_fail_decl = t;
 917     }
 918
 919   return build_call_expr (t, 0);
 920 #endif
 921 }
 922
 923 bool
 924 hook_bool_const_rtx_commutative_p (const_rtx x,
 925                                    int outer_code ATTRIBUTE_UNUSED)
 926 {
 927   return COMMUTATIVE_P (x);
 928 }
 929
 930 rtx
 931 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
 932                         const_tree fn_decl_or_type,
 933                         bool outgoing ATTRIBUTE_UNUSED)
 934 {
 935   /* The old interface doesn't handle receiving the function type.  */
 936   if (fn_decl_or_type
 937       && !DECL_P (fn_decl_or_type))
 938     fn_decl_or_type = NULL;
 939
 940 #ifdef FUNCTION_VALUE
 941   return FUNCTION_VALUE (ret_type, fn_decl_or_type);
 942 #else
 943   gcc_unreachable ();
 944 #endif
 945 }
 946
 947 rtx
 948 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED,
 949                        const_rtx fun ATTRIBUTE_UNUSED)
 950 {
 951 #ifdef LIBCALL_VALUE
 952   return LIBCALL_VALUE (mode);
 953 #else
 954   gcc_unreachable ();
 955 #endif
 956 }
 957
 958 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P.  */
 959
 960 bool
 961 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
 962 {
 963 #ifdef FUNCTION_VALUE_REGNO_P
 964   return FUNCTION_VALUE_REGNO_P (regno);
 965 #else
 966   gcc_unreachable ();
 967 #endif
 968 }
 969
 970 rtx
 971 default_internal_arg_pointer (void)
 972 {
 973   /* If the reg that the virtual arg pointer will be translated into is
 974      not a fixed reg or is the stack pointer, make a copy of the virtual
 975      arg pointer, and address parms via the copy.  The frame pointer is
 976      considered fixed even though it is not marked as such.  */
 977   if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
 978        || ! (fixed_regs[ARG_POINTER_REGNUM]
 979              || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
 980     return copy_to_reg (virtual_incoming_args_rtx);
 981   else
 982     return virtual_incoming_args_rtx;
 983 }
 984
 985 rtx
 986 default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
 987 {
 988   if (incoming_p)
 989     {
 990 #ifdef STATIC_CHAIN_INCOMING_REGNUM
 991       return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
 992 #endif
 993     }
 994
 995 #ifdef STATIC_CHAIN_REGNUM
 996   return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
 997 #endif
 998
 999   {
1000     static bool issued_error;
1001     if (!issued_error)
1002       {
1003         issued_error = true;
1004         sorry ("nested functions not supported on this target");
1005       }
1006
1007     /* It really doesn't matter what we return here, so long at it
1008        doesn't cause the rest of the compiler to crash.  */
1009     return gen_rtx_MEM (Pmode, stack_pointer_rtx);
1010   }
1011 }
1012
1013 void
1014 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
1015                          rtx ARG_UNUSED (r_chain))
1016 {
1017   sorry ("nested function trampolines not supported on this target");
1018 }
1019
1020 int
1021 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED,
1022                           tree funtype ATTRIBUTE_UNUSED,
1023                           int size ATTRIBUTE_UNUSED)
1024 {
1025   return 0;
1026 }
1027
1028 reg_class_t
1029 default_branch_target_register_class (void)
1030 {
1031   return NO_REGS;
1032 }
1033
1034 reg_class_t
1035 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED,
1036                                          reg_class_t cl,
1037                                          reg_class_t best_cl ATTRIBUTE_UNUSED)
1038 {
1039   return cl;
1040 }
1041
1042 extern bool
1043 default_lra_p (void)
1044 {
1045   return true;
1046 }
1047
1048 int
1049 default_register_priority (int hard_regno ATTRIBUTE_UNUSED)
1050 {
1051   return 0;
1052 }
1053
1054 extern bool
1055 default_register_usage_leveling_p (void)
1056 {
1057   return false;
1058 }
1059
1060 extern bool
1061 default_different_addr_displacement_p (void)
1062 {
1063   return false;
1064 }
1065
1066 reg_class_t
1067 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
1068                           reg_class_t reload_class_i ATTRIBUTE_UNUSED,
1069                           machine_mode reload_mode ATTRIBUTE_UNUSED,
1070                           secondary_reload_info *sri)
1071 {
1072   enum reg_class rclass = NO_REGS;
1073   enum reg_class reload_class = (enum reg_class) reload_class_i;
1074
1075   if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
1076     {
1077       sri->icode = sri->prev_sri->t_icode;
1078       return NO_REGS;
1079     }
1080 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1081   if (in_p)
1082     rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x);
1083 #endif
1084 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1085   if (! in_p)
1086     rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
1087 #endif
1088   if (rclass != NO_REGS)
1089     {
1090       enum insn_code icode
1091         = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
1092                                 reload_mode);
1093
1094       if (icode != CODE_FOR_nothing
1095           && !insn_operand_matches (icode, in_p, x))
1096         icode = CODE_FOR_nothing;
1097       else if (icode != CODE_FOR_nothing)
1098         {
1099           const char *insn_constraint, *scratch_constraint;
1100           enum reg_class insn_class, scratch_class;
1101
1102           gcc_assert (insn_data[(int) icode].n_operands == 3);
1103           insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
1104           if (!*insn_constraint)
1105             insn_class = ALL_REGS;
1106           else
1107             {
1108               if (in_p)
1109                 {
1110                   gcc_assert (*insn_constraint == '=');
1111                   insn_constraint++;
1112                 }
1113               insn_class = (reg_class_for_constraint
1114                             (lookup_constraint (insn_constraint)));
1115               gcc_assert (insn_class != NO_REGS);
1116             }
1117
1118           scratch_constraint = insn_data[(int) icode].operand[2].constraint;
1119           /* The scratch register's constraint must start with "=&",
1120              except for an input reload, where only "=" is necessary,
1121              and where it might be beneficial to re-use registers from
1122              the input.  */
1123           gcc_assert (scratch_constraint[0] == '='
1124                       && (in_p || scratch_constraint[1] == '&'));
1125           scratch_constraint++;
1126           if (*scratch_constraint == '&')
1127             scratch_constraint++;
1128           scratch_class = (reg_class_for_constraint
1129                            (lookup_constraint (scratch_constraint)));
1130
1131           if (reg_class_subset_p (reload_class, insn_class))
1132             {
1133               gcc_assert (scratch_class == rclass);
1134               rclass = NO_REGS;
1135             }
1136           else
1137             rclass = insn_class;
1138
1139         }
1140       if (rclass == NO_REGS)
1141         sri->icode = icode;
1142       else
1143         sri->t_icode = icode;
1144     }
1145   return rclass;
1146 }
1147
1148 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE.  */
1149
1150 machine_mode
1151 default_secondary_memory_needed_mode (machine_mode mode)
1152 {
1153   if (!targetm.lra_p ()
1154       && GET_MODE_BITSIZE (mode) < BITS_PER_WORD
1155       && INTEGRAL_MODE_P (mode))
1156     return mode_for_size (BITS_PER_WORD, GET_MODE_CLASS (mode), 0).require ();
1157   return mode;
1158 }
1159
1160 /* By default, if flag_pic is true, then neither local nor global relocs
1161    should be placed in readonly memory.  */
1162
1163 int
1164 default_reloc_rw_mask (void)
1165 {
1166   return flag_pic ? 3 : 0;
1167 }
1168
1169 /* By default, do no modification. */
1170 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
1171                                          tree id)
1172 {
1173    return id;
1174 }
1175
1176 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT.  */
1177
1178 HOST_WIDE_INT
1179 default_static_rtx_alignment (machine_mode mode)
1180 {
1181   return GET_MODE_ALIGNMENT (mode);
1182 }
1183
1184 /* The default implementation of TARGET_CONSTANT_ALIGNMENT.  */
1185
1186 HOST_WIDE_INT
1187 default_constant_alignment (const_tree, HOST_WIDE_INT align)
1188 {
1189   return align;
1190 }
1191
1192 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1193    to at least BITS_PER_WORD but otherwise makes no changes.  */
1194
1195 HOST_WIDE_INT
1196 constant_alignment_word_strings (const_tree exp, HOST_WIDE_INT align)
1197 {
1198   if (TREE_CODE (exp) == STRING_CST)
1199     return MAX (align, BITS_PER_WORD);
1200   return align;
1201 }
1202
1203 /* Default to natural alignment for vector types.  */
1204 HOST_WIDE_INT
1205 default_vector_alignment (const_tree type)
1206 {
1207   HOST_WIDE_INT align = tree_to_shwi (TYPE_SIZE (type));
1208   if (align > MAX_OFILE_ALIGNMENT)
1209     align = MAX_OFILE_ALIGNMENT;
1210   return align;
1211 }
1212
1213 /* The default implementation of
1214    TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT.  */
1215
1216 HOST_WIDE_INT
1217 default_preferred_vector_alignment (const_tree type)
1218 {
1219   return TYPE_ALIGN (type);
1220 }
1221
1222 /* By default assume vectors of element TYPE require a multiple of the natural
1223    alignment of TYPE.  TYPE is naturally aligned if IS_PACKED is false.  */
1224 bool
1225 default_builtin_vector_alignment_reachable (const_tree /*type*/, bool is_packed)
1226 {
1227   return ! is_packed;
1228 }
1229
1230 /* By default, assume that a target supports any factor of misalignment
1231    memory access if it supports movmisalign patten.
1232    is_packed is true if the memory access is defined in a packed struct.  */
1233 bool
1234 default_builtin_support_vector_misalignment (machine_mode mode,
1235                                              const_tree type
1236                                              ATTRIBUTE_UNUSED,
1237                                              int misalignment
1238                                              ATTRIBUTE_UNUSED,
1239                                              bool is_packed
1240                                              ATTRIBUTE_UNUSED)
1241 {
1242   if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1243     return true;
1244   return false;
1245 }
1246
1247 /* By default, only attempt to parallelize bitwise operations, and
1248    possibly adds/subtracts using bit-twiddling.  */
1249
1250 machine_mode
1251 default_preferred_simd_mode (scalar_mode)
1252 {
1253   return word_mode;
1254 }
1255
1256 /* By default only the size derived from the preferred vector mode
1257    is tried.  */
1258
1259 unsigned int
1260 default_autovectorize_vector_sizes (void)
1261 {
1262   return 0;
1263 }
1264
1265 /* By defaults a vector of integers is used as a mask.  */
1266
1267 opt_machine_mode
1268 default_get_mask_mode (unsigned nunits, unsigned vector_size)
1269 {
1270   unsigned elem_size = vector_size / nunits;
1271   scalar_int_mode elem_mode
1272     = smallest_int_mode_for_size (elem_size * BITS_PER_UNIT);
1273   machine_mode vector_mode;
1274
1275   gcc_assert (elem_size * nunits == vector_size);
1276
1277   if (mode_for_vector (elem_mode, nunits).exists (&vector_mode)
1278       && VECTOR_MODE_P (vector_mode)
1279       && targetm.vector_mode_supported_p (vector_mode))
1280     return vector_mode;
1281
1282   return opt_machine_mode ();
1283 }
1284
1285 /* By default, the cost model accumulates three separate costs (prologue,
1286    loop body, and epilogue) for a vectorized loop or block.  So allocate an
1287    array of three unsigned ints, set it to zero, and return its address.  */
1288
1289 void *
1290 default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED)
1291 {
1292   unsigned *cost = XNEWVEC (unsigned, 3);
1293   cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0;
1294   return cost;
1295 }
1296
1297 /* By default, the cost model looks up the cost of the given statement
1298    kind and mode, multiplies it by the occurrence count, accumulates
1299    it into the cost specified by WHERE, and returns the cost added.  */
1300
1301 unsigned
1302 default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
1303                        struct _stmt_vec_info *stmt_info, int misalign,
1304                        enum vect_cost_model_location where)
1305 {
1306   unsigned *cost = (unsigned *) data;
1307   unsigned retval = 0;
1308
1309   tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE;
1310   int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype,
1311                                                                 misalign);
1312    /* Statements in an inner loop relative to the loop being
1313       vectorized are weighted more heavily.  The value here is
1314       arbitrary and could potentially be improved with analysis.  */
1315   if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info))
1316     count *= 50;  /* FIXME.  */
1317
1318   retval = (unsigned) (count * stmt_cost);
1319   cost[where] += retval;
1320
1321   return retval;
1322 }
1323
1324 /* By default, the cost model just returns the accumulated costs.  */
1325
1326 void
1327 default_finish_cost (void *data, unsigned *prologue_cost,
1328                      unsigned *body_cost, unsigned *epilogue_cost)
1329 {
1330   unsigned *cost = (unsigned *) data;
1331   *prologue_cost = cost[vect_prologue];
1332   *body_cost     = cost[vect_body];
1333   *epilogue_cost = cost[vect_epilogue];
1334 }
1335
1336 /* Free the cost data.  */
1337
1338 void
1339 default_destroy_cost_data (void *data)
1340 {
1341   free (data);
1342 }
1343
1344 /* Determine whether or not a pointer mode is valid. Assume defaults
1345    of ptr_mode or Pmode - can be overridden.  */
1346 bool
1347 default_valid_pointer_mode (scalar_int_mode mode)
1348 {
1349   return (mode == ptr_mode || mode == Pmode);
1350 }
1351
1352 /* Determine whether the memory reference specified by REF may alias
1353    the C libraries errno location.  */
1354 bool
1355 default_ref_may_alias_errno (ao_ref *ref)
1356 {
1357   tree base = ao_ref_base (ref);
1358   /* The default implementation assumes the errno location is
1359      a declaration of type int or is always accessed via a
1360      pointer to int.  We assume that accesses to errno are
1361      not deliberately obfuscated (even in conforming ways).  */
1362   if (TYPE_UNSIGNED (TREE_TYPE (base))
1363       || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1364     return false;
1365   /* The default implementation assumes an errno location
1366      declaration is never defined in the current compilation unit.  */
1367   if (DECL_P (base)
1368       && !TREE_STATIC (base))
1369     return true;
1370   else if (TREE_CODE (base) == MEM_REF
1371            && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1372     {
1373       struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1374       return !pi || pi->pt.anything || pi->pt.nonlocal;
1375     }
1376   return false;
1377 }
1378
1379 /* Return the mode for a pointer to a given ADDRSPACE,
1380    defaulting to ptr_mode for all address spaces.  */
1381
1382 scalar_int_mode
1383 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1384 {
1385   return ptr_mode;
1386 }
1387
1388 /* Return the mode for an address in a given ADDRSPACE,
1389    defaulting to Pmode for all address spaces.  */
1390
1391 scalar_int_mode
1392 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1393 {
1394   return Pmode;
1395 }
1396
1397 /* Named address space version of valid_pointer_mode.
1398    To match the above, the same modes apply to all address spaces.  */
1399
1400 bool
1401 default_addr_space_valid_pointer_mode (scalar_int_mode mode,
1402                                        addr_space_t as ATTRIBUTE_UNUSED)
1403 {
1404   return targetm.valid_pointer_mode (mode);
1405 }
1406
1407 /* Some places still assume that all pointer or address modes are the
1408    standard Pmode and ptr_mode.  These optimizations become invalid if
1409    the target actually supports multiple different modes.  For now,
1410    we disable such optimizations on such targets, using this function.  */
1411
1412 bool
1413 target_default_pointer_address_modes_p (void)
1414 {
1415   if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1416     return false;
1417   if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1418     return false;
1419
1420   return true;
1421 }
1422
1423 /* Named address space version of legitimate_address_p.
1424    By default, all address spaces have the same form.  */
1425
1426 bool
1427 default_addr_space_legitimate_address_p (machine_mode mode, rtx mem,
1428                                          bool strict,
1429                                          addr_space_t as ATTRIBUTE_UNUSED)
1430 {
1431   return targetm.legitimate_address_p (mode, mem, strict);
1432 }
1433
1434 /* Named address space version of LEGITIMIZE_ADDRESS.
1435    By default, all address spaces have the same form.  */
1436
1437 rtx
1438 default_addr_space_legitimize_address (rtx x, rtx oldx, machine_mode mode,
1439                                        addr_space_t as ATTRIBUTE_UNUSED)
1440 {
1441   return targetm.legitimize_address (x, oldx, mode);
1442 }
1443
1444 /* The default hook for determining if one named address space is a subset of
1445    another and to return which address space to use as the common address
1446    space.  */
1447
1448 bool
1449 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1450 {
1451   return (subset == superset);
1452 }
1453
1454 /* The default hook for determining if 0 within a named address
1455    space is a valid address.  */
1456
1457 bool
1458 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED)
1459 {
1460   return false;
1461 }
1462
1463 /* The default hook for debugging the address space is to return the
1464    address space number to indicate DW_AT_address_class.  */
1465 int
1466 default_addr_space_debug (addr_space_t as)
1467 {
1468   return as;
1469 }
1470
1471 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1472    Don't complain about any address space.  */
1473
1474 void
1475 default_addr_space_diagnose_usage (addr_space_t, location_t)
1476 {
1477 }
1478
1479
1480 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1481    called for targets with only a generic address space.  */
1482
1483 rtx
1484 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1485                             tree from_type ATTRIBUTE_UNUSED,
1486                             tree to_type ATTRIBUTE_UNUSED)
1487 {
1488   gcc_unreachable ();
1489 }
1490
1491 /* The defualt implementation of TARGET_HARD_REGNO_NREGS.  */
1492
1493 unsigned int
1494 default_hard_regno_nregs (unsigned int, machine_mode mode)
1495 {
1496   return CEIL (GET_MODE_SIZE (mode), UNITS_PER_WORD);
1497 }
1498
1499 bool
1500 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1501 {
1502   return true;
1503 }
1504
1505 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P.  */
1506
1507 bool
1508 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED,
1509                                   addr_space_t addrspace ATTRIBUTE_UNUSED)
1510 {
1511   return false;
1512 }
1513
1514 bool
1515 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1516                                          tree ARG_UNUSED (name),
1517                                          tree ARG_UNUSED (args),
1518                                          int ARG_UNUSED (flags))
1519 {
1520   warning (OPT_Wattributes,
1521            "target attribute is not supported on this machine");
1522
1523   return false;
1524 }
1525
1526 bool
1527 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1528                                     tree ARG_UNUSED (pop_target))
1529 {
1530   /* If args is NULL the caller is handle_pragma_pop_options ().  In that case,
1531      emit no warning because "#pragma GCC pop_target" is valid on targets that
1532      do not have the "target" pragma.  */
1533   if (args)
1534     warning (OPT_Wpragmas,
1535              "#pragma GCC target is not supported for this machine");
1536
1537   return false;
1538 }
1539
1540 bool
1541 default_target_can_inline_p (tree caller, tree callee)
1542 {
1543   tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1544   tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1545   if (! callee_opts)
1546     callee_opts = target_option_default_node;
1547   if (! caller_opts)
1548     caller_opts = target_option_default_node;
1549
1550   /* If both caller and callee have attributes, assume that if the
1551      pointer is different, the two functions have different target
1552      options since build_target_option_node uses a hash table for the
1553      options.  */
1554   return callee_opts == caller_opts;
1555 }
1556
1557 /* If the machine does not have a case insn that compares the bounds,
1558    this means extra overhead for dispatch tables, which raises the
1559    threshold for using them.  */
1560
1561 unsigned int
1562 default_case_values_threshold (void)
1563 {
1564   return (targetm.have_casesi () ? 4 : 5);
1565 }
1566
1567 bool
1568 default_have_conditional_execution (void)
1569 {
1570   return HAVE_conditional_execution;
1571 }
1572
1573 /* By default we assume that c99 functions are present at the runtime,
1574    but sincos is not.  */
1575 bool
1576 default_libc_has_function (enum function_class fn_class)
1577 {
1578   if (fn_class == function_c94
1579       || fn_class == function_c99_misc
1580       || fn_class == function_c99_math_complex)
1581     return true;
1582
1583   return false;
1584 }
1585
1586 bool
1587 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1588 {
1589   return true;
1590 }
1591
1592 bool
1593 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1594 {
1595   return false;
1596 }
1597
1598 tree
1599 default_builtin_tm_load_store (tree ARG_UNUSED (type))
1600 {
1601   return NULL_TREE;
1602 }
1603
1604 /* Compute cost of moving registers to/from memory.  */
1605
1606 int
1607 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1608                           reg_class_t rclass ATTRIBUTE_UNUSED,
1609                           bool in ATTRIBUTE_UNUSED)
1610 {
1611 #ifndef MEMORY_MOVE_COST
1612     return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1613 #else
1614     return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in);
1615 #endif
1616 }
1617
1618 /* Compute cost of moving data from a register of class FROM to one of
1619    TO, using MODE.  */
1620
1621 int
1622 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1623                             reg_class_t from ATTRIBUTE_UNUSED,
1624                             reg_class_t to ATTRIBUTE_UNUSED)
1625 {
1626 #ifndef REGISTER_MOVE_COST
1627   return 2;
1628 #else
1629   return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to);
1630 #endif
1631 }
1632
1633 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS.  */
1634
1635 bool
1636 default_slow_unaligned_access (machine_mode, unsigned int)
1637 {
1638   return STRICT_ALIGNMENT;
1639 }
1640
1641 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1642    behavior.  SPEED_P is true if we are compiling for speed.  */
1643
1644 unsigned int
1645 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED)
1646 {
1647   unsigned int move_ratio;
1648 #ifdef MOVE_RATIO
1649   move_ratio = (unsigned int) MOVE_RATIO (speed_p);
1650 #else
1651 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1652   move_ratio = 2;
1653 #else /* No movmem patterns, pick a default.  */
1654   move_ratio = ((speed_p) ? 15 : 3);
1655 #endif
1656 #endif
1657   return move_ratio;
1658 }
1659
1660 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1661    used; return FALSE if the movmem/setmem optab should be expanded, or
1662    a call to memcpy emitted.  */
1663
1664 bool
1665 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
1666                                         unsigned int alignment,
1667                                         enum by_pieces_operation op,
1668                                         bool speed_p)
1669 {
1670   unsigned int max_size = 0;
1671   unsigned int ratio = 0;
1672
1673   switch (op)
1674     {
1675     case CLEAR_BY_PIECES:
1676       max_size = STORE_MAX_PIECES;
1677       ratio = CLEAR_RATIO (speed_p);
1678       break;
1679     case MOVE_BY_PIECES:
1680       max_size = MOVE_MAX_PIECES;
1681       ratio = get_move_ratio (speed_p);
1682       break;
1683     case SET_BY_PIECES:
1684       max_size = STORE_MAX_PIECES;
1685       ratio = SET_RATIO (speed_p);
1686       break;
1687     case STORE_BY_PIECES:
1688       max_size = STORE_MAX_PIECES;
1689       ratio = get_move_ratio (speed_p);
1690       break;
1691     case COMPARE_BY_PIECES:
1692       max_size = COMPARE_MAX_PIECES;
1693       /* Pick a likely default, just as in get_move_ratio.  */
1694       ratio = speed_p ? 15 : 3;
1695       break;
1696     }
1697
1698   return by_pieces_ninsns (size, alignment, max_size + 1, op) < ratio;
1699 }
1700
1701 /* This hook controls code generation for expanding a memcmp operation by
1702    pieces.  Return 1 for the normal pattern of compare/jump after each pair
1703    of loads, or a higher number to reduce the number of branches.  */
1704
1705 int
1706 default_compare_by_pieces_branch_ratio (machine_mode)
1707 {
1708   return 1;
1709 }
1710
1711 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1712    entry.  If RECORD_P is true and the target supports named sections,
1713    the location of the NOPs will be recorded in a special object section
1714    called "__patchable_function_entries".  This routine may be called
1715    twice per function to put NOPs before and after the function
1716    entry.  */
1717
1718 void
1719 default_print_patchable_function_entry (FILE *file,
1720                                         unsigned HOST_WIDE_INT patch_area_size,
1721                                         bool record_p)
1722 {
1723   const char *nop_templ = 0;
1724   int code_num;
1725   rtx_insn *my_nop = make_insn_raw (gen_nop ());
1726
1727   /* We use the template alone, relying on the (currently sane) assumption
1728      that the NOP template does not have variable operands.  */
1729   code_num = recog_memoized (my_nop);
1730   nop_templ = get_insn_template (code_num, my_nop);
1731
1732   if (record_p && targetm_common.have_named_sections)
1733     {
1734       char buf[256];
1735       static int patch_area_number;
1736       section *previous_section = in_section;
1737
1738       patch_area_number++;
1739       ASM_GENERATE_INTERNAL_LABEL (buf, "LPFE", patch_area_number);
1740
1741       switch_to_section (get_section ("__patchable_function_entries",
1742                                       0, NULL));
1743       fputs (integer_asm_op (POINTER_SIZE_UNITS, false), file);
1744       assemble_name_raw (file, buf);
1745       fputc ('\n', file);
1746
1747       switch_to_section (previous_section);
1748       ASM_OUTPUT_LABEL (file, buf);
1749     }
1750
1751   unsigned i;
1752   for (i = 0; i < patch_area_size; ++i)
1753     fprintf (file, "\t%s\n", nop_templ);
1754 }
1755
1756 bool
1757 default_profile_before_prologue (void)
1758 {
1759 #ifdef PROFILE_BEFORE_PROLOGUE
1760   return true;
1761 #else
1762   return false;
1763 #endif
1764 }
1765
1766 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS.  */
1767
1768 reg_class_t
1769 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1770                                 reg_class_t rclass)
1771 {
1772 #ifdef PREFERRED_RELOAD_CLASS
1773   return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1774 #else
1775   return rclass;
1776 #endif
1777 }
1778
1779 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS.  */
1780
1781 reg_class_t
1782 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1783                                        reg_class_t rclass)
1784 {
1785   return rclass;
1786 }
1787
1788 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS.  */
1789 reg_class_t
1790 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1791 {
1792   return NO_REGS;
1793 }
1794
1795 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P.  */
1796
1797 bool
1798 default_class_likely_spilled_p (reg_class_t rclass)
1799 {
1800   return (reg_class_size[(int) rclass] == 1);
1801 }
1802
1803 /* The default implementation of TARGET_CLASS_MAX_NREGS.  */
1804
1805 unsigned char
1806 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1807                          machine_mode mode ATTRIBUTE_UNUSED)
1808 {
1809 #ifdef CLASS_MAX_NREGS
1810   return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass, mode);
1811 #else
1812   return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD);
1813 #endif
1814 }
1815
1816 /* Determine the debugging unwind mechanism for the target.  */
1817
1818 enum unwind_info_type
1819 default_debug_unwind_info (void)
1820 {
1821   /* If the target wants to force the use of dwarf2 unwind info, let it.  */
1822   /* ??? Change all users to the hook, then poison this.  */
1823 #ifdef DWARF2_FRAME_INFO
1824   if (DWARF2_FRAME_INFO)
1825     return UI_DWARF2;
1826 #endif
1827
1828   /* Otherwise, only turn it on if dwarf2 debugging is enabled.  */
1829 #ifdef DWARF2_DEBUGGING_INFO
1830   if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1831     return UI_DWARF2;
1832 #endif
1833
1834   return UI_NONE;
1835 }
1836
1837 /* Determine the correct mode for a Dwarf frame register that represents
1838    register REGNO.  */
1839
1840 machine_mode
1841 default_dwarf_frame_reg_mode (int regno)
1842 {
1843   machine_mode save_mode = reg_raw_mode[regno];
1844
1845   if (targetm.hard_regno_call_part_clobbered (regno, save_mode))
1846     save_mode = choose_hard_reg_mode (regno, 1, true);
1847   return save_mode;
1848 }
1849
1850 /* To be used by targets where reg_raw_mode doesn't return the right
1851    mode for registers used in apply_builtin_return and apply_builtin_arg.  */
1852
1853 machine_mode
1854 default_get_reg_raw_mode (int regno)
1855 {
1856   return reg_raw_mode[regno];
1857 }
1858
1859 /* Return true if a leaf function should stay leaf even with profiling
1860    enabled.  */
1861
1862 bool
1863 default_keep_leaf_when_profiled ()
1864 {
1865   return false;
1866 }
1867
1868 /* Return true if the state of option OPTION should be stored in PCH files
1869    and checked by default_pch_valid_p.  Store the option's current state
1870    in STATE if so.  */
1871
1872 static inline bool
1873 option_affects_pch_p (int option, struct cl_option_state *state)
1874 {
1875   if ((cl_options[option].flags & CL_TARGET) == 0)
1876     return false;
1877   if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
1878     return false;
1879   if (option_flag_var (option, &global_options) == &target_flags)
1880     if (targetm.check_pch_target_flags)
1881       return false;
1882   return get_option_state (&global_options, option, state);
1883 }
1884
1885 /* Default version of get_pch_validity.
1886    By default, every flag difference is fatal; that will be mostly right for
1887    most targets, but completely right for very few.  */
1888
1889 void *
1890 default_get_pch_validity (size_t *sz)
1891 {
1892   struct cl_option_state state;
1893   size_t i;
1894   char *result, *r;
1895
1896   *sz = 2;
1897   if (targetm.check_pch_target_flags)
1898     *sz += sizeof (target_flags);
1899   for (i = 0; i < cl_options_count; i++)
1900     if (option_affects_pch_p (i, &state))
1901       *sz += state.size;
1902
1903   result = r = XNEWVEC (char, *sz);
1904   r[0] = flag_pic;
1905   r[1] = flag_pie;
1906   r += 2;
1907   if (targetm.check_pch_target_flags)
1908     {
1909       memcpy (r, &target_flags, sizeof (target_flags));
1910       r += sizeof (target_flags);
1911     }
1912
1913   for (i = 0; i < cl_options_count; i++)
1914     if (option_affects_pch_p (i, &state))
1915       {
1916         memcpy (r, state.data, state.size);
1917         r += state.size;
1918       }
1919
1920   return result;
1921 }
1922
1923 /* Return a message which says that a PCH file was created with a different
1924    setting of OPTION.  */
1925
1926 static const char *
1927 pch_option_mismatch (const char *option)
1928 {
1929   return xasprintf (_("created and used with differing settings of '%s'"),
1930                     option);
1931 }
1932
1933 /* Default version of pch_valid_p.  */
1934
1935 const char *
1936 default_pch_valid_p (const void *data_p, size_t len)
1937 {
1938   struct cl_option_state state;
1939   const char *data = (const char *)data_p;
1940   size_t i;
1941
1942   /* -fpic and -fpie also usually make a PCH invalid.  */
1943   if (data[0] != flag_pic)
1944     return _("created and used with different settings of -fpic");
1945   if (data[1] != flag_pie)
1946     return _("created and used with different settings of -fpie");
1947   data += 2;
1948
1949   /* Check target_flags.  */
1950   if (targetm.check_pch_target_flags)
1951     {
1952       int tf;
1953       const char *r;
1954
1955       memcpy (&tf, data, sizeof (target_flags));
1956       data += sizeof (target_flags);
1957       len -= sizeof (target_flags);
1958       r = targetm.check_pch_target_flags (tf);
1959       if (r != NULL)
1960         return r;
1961     }
1962
1963   for (i = 0; i < cl_options_count; i++)
1964     if (option_affects_pch_p (i, &state))
1965       {
1966         if (memcmp (data, state.data, state.size) != 0)
1967           return pch_option_mismatch (cl_options[i].opt_text);
1968         data += state.size;
1969         len -= state.size;
1970       }
1971
1972   return NULL;
1973 }
1974
1975 /* Default version of cstore_mode.  */
1976
1977 scalar_int_mode
1978 default_cstore_mode (enum insn_code icode)
1979 {
1980   return as_a <scalar_int_mode> (insn_data[(int) icode].operand[0].mode);
1981 }
1982
1983 /* Default version of member_type_forces_blk.  */
1984
1985 bool
1986 default_member_type_forces_blk (const_tree, machine_mode)
1987 {
1988   return false;
1989 }
1990
1991 rtx
1992 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
1993                              rtx ptr ATTRIBUTE_UNUSED,
1994                              rtx bnd ATTRIBUTE_UNUSED)
1995 {
1996   gcc_unreachable ();
1997 }
1998
1999 void
2000 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
2001                               rtx addr ATTRIBUTE_UNUSED,
2002                               rtx bounds ATTRIBUTE_UNUSED,
2003                               rtx to ATTRIBUTE_UNUSED)
2004 {
2005   gcc_unreachable ();
2006 }
2007
2008 rtx
2009 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
2010 {
2011   gcc_unreachable ();
2012 }
2013
2014 void
2015 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
2016                                rtx bounds ATTRIBUTE_UNUSED)
2017 {
2018   gcc_unreachable ();
2019 }
2020
2021 /* Default version of canonicalize_comparison.  */
2022
2023 void
2024 default_canonicalize_comparison (int *, rtx *, rtx *, bool)
2025 {
2026 }
2027
2028 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV.  */
2029
2030 void
2031 default_atomic_assign_expand_fenv (tree *, tree *, tree *)
2032 {
2033 }
2034
2035 #ifndef PAD_VARARGS_DOWN
2036 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2037 #endif
2038
2039 /* Build an indirect-ref expression over the given TREE, which represents a
2040    piece of a va_arg() expansion.  */
2041 tree
2042 build_va_arg_indirect_ref (tree addr)
2043 {
2044   addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr);
2045   return addr;
2046 }
2047
2048 /* The "standard" implementation of va_arg: read the value from the
2049    current (padded) address and increment by the (padded) size.  */
2050
2051 tree
2052 std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
2053                           gimple_seq *post_p)
2054 {
2055   tree addr, t, type_size, rounded_size, valist_tmp;
2056   unsigned HOST_WIDE_INT align, boundary;
2057   bool indirect;
2058
2059   /* All of the alignment and movement below is for args-grow-up machines.
2060      As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2061      implement their own specialized gimplify_va_arg_expr routines.  */
2062   if (ARGS_GROW_DOWNWARD)
2063     gcc_unreachable ();
2064
2065   indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false);
2066   if (indirect)
2067     type = build_pointer_type (type);
2068
2069   align = PARM_BOUNDARY / BITS_PER_UNIT;
2070   boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
2071
2072   /* When we align parameter on stack for caller, if the parameter
2073      alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2074      aligned at MAX_SUPPORTED_STACK_ALIGNMENT.  We will match callee
2075      here with caller.  */
2076   if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
2077     boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
2078
2079   boundary /= BITS_PER_UNIT;
2080
2081   /* Hoist the valist value into a temporary for the moment.  */
2082   valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
2083
2084   /* va_list pointer is aligned to PARM_BOUNDARY.  If argument actually
2085      requires greater alignment, we must perform dynamic alignment.  */
2086   if (boundary > align
2087       && !integer_zerop (TYPE_SIZE (type)))
2088     {
2089       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2090                   fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
2091       gimplify_and_add (t, pre_p);
2092
2093       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2094                   fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
2095                                valist_tmp,
2096                                build_int_cst (TREE_TYPE (valist), -boundary)));
2097       gimplify_and_add (t, pre_p);
2098     }
2099   else
2100     boundary = align;
2101
2102   /* If the actual alignment is less than the alignment of the type,
2103      adjust the type accordingly so that we don't assume strict alignment
2104      when dereferencing the pointer.  */
2105   boundary *= BITS_PER_UNIT;
2106   if (boundary < TYPE_ALIGN (type))
2107     {
2108       type = build_variant_type_copy (type);
2109       SET_TYPE_ALIGN (type, boundary);
2110     }
2111
2112   /* Compute the rounded size of the type.  */
2113   type_size = size_in_bytes (type);
2114   rounded_size = round_up (type_size, align);
2115
2116   /* Reduce rounded_size so it's sharable with the postqueue.  */
2117   gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
2118
2119   /* Get AP.  */
2120   addr = valist_tmp;
2121   if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
2122     {
2123       /* Small args are padded downward.  */
2124       t = fold_build2_loc (input_location, GT_EXPR, sizetype,
2125                        rounded_size, size_int (align));
2126       t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
2127                        size_binop (MINUS_EXPR, rounded_size, type_size));
2128       addr = fold_build_pointer_plus (addr, t);
2129     }
2130
2131   /* Compute new value for AP.  */
2132   t = fold_build_pointer_plus (valist_tmp, rounded_size);
2133   t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
2134   gimplify_and_add (t, pre_p);
2135
2136   addr = fold_convert (build_pointer_type (type), addr);
2137
2138   if (indirect)
2139     addr = build_va_arg_indirect_ref (addr);
2140
2141   return build_va_arg_indirect_ref (addr);
2142 }
2143
2144 tree
2145 default_chkp_bound_type (void)
2146 {
2147   tree res = make_node (POINTER_BOUNDS_TYPE);
2148   TYPE_PRECISION (res) = TYPE_PRECISION (size_type_node) * 2;
2149   TYPE_NAME (res) = get_identifier ("__bounds_type");
2150   SET_TYPE_MODE (res, targetm.chkp_bound_mode ());
2151   layout_type (res);
2152   return res;
2153 }
2154
2155 machine_mode
2156 default_chkp_bound_mode (void)
2157 {
2158   return VOIDmode;
2159 }
2160
2161 tree
2162 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED)
2163 {
2164   return NULL_TREE;
2165 }
2166
2167 rtx
2168 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED,
2169                                     const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
2170                                     bool outgoing ATTRIBUTE_UNUSED)
2171 {
2172   gcc_unreachable ();
2173 }
2174
2175 tree
2176 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED,
2177                                    HOST_WIDE_INT ub ATTRIBUTE_UNUSED)
2178 {
2179   return NULL_TREE;
2180 }
2181
2182 int
2183 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED,
2184                                 tree lb ATTRIBUTE_UNUSED,
2185                                 tree ub ATTRIBUTE_UNUSED,
2186                                 tree *stmts ATTRIBUTE_UNUSED)
2187 {
2188   return 0;
2189 }
2190
2191 void
2192 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
2193                                       machine_mode mode ATTRIBUTE_UNUSED,
2194                                       tree type ATTRIBUTE_UNUSED,
2195                                       int *pretend_arg_size ATTRIBUTE_UNUSED,
2196                                       int second_time ATTRIBUTE_UNUSED)
2197 {
2198 }
2199
2200 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2201    not support nested low-overhead loops.  */
2202
2203 bool
2204 can_use_doloop_if_innermost (const widest_int &, const widest_int &,
2205                              unsigned int loop_depth, bool)
2206 {
2207   return loop_depth == 1;
2208 }
2209
2210 /* Default implementation of TARGET_OPTAB_SUPPORTED_P.  */
2211
2212 bool
2213 default_optab_supported_p (int, machine_mode, machine_mode, optimization_type)
2214 {
2215   return true;
2216 }
2217
2218 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST.  */
2219
2220 unsigned int
2221 default_max_noce_ifcvt_seq_cost (edge e)
2222 {
2223   bool predictable_p = predictable_edge_p (e);
2224
2225   enum compiler_param param
2226     = (predictable_p
2227        ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2228        : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST);
2229
2230   /* If we have a parameter set, use that, otherwise take a guess using
2231      BRANCH_COST.  */
2232   if (global_options_set.x_param_values[param])
2233     return PARAM_VALUE (param);
2234   else
2235     return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (3);
2236 }
2237
2238 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION.  */
2239
2240 unsigned int
2241 default_min_arithmetic_precision (void)
2242 {
2243   return WORD_REGISTER_OPERATIONS ? BITS_PER_WORD : BITS_PER_UNIT;
2244 }
2245
2246 /* Default implementation of TARGET_C_EXCESS_PRECISION.  */
2247
2248 enum flt_eval_method
2249 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED)
2250 {
2251   return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
2252 }
2253
2254 bool
2255 default_stack_clash_protection_final_dynamic_probe (rtx residual ATTRIBUTE_UNUSED)
2256 {
2257   return 0;
2258 }
2259
2260 #include "gt-targhooks.h"