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 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 /* The default implementation of TARGET_TRANSLATE_MODE_ATTRIBUTE.  */
 397
 398 machine_mode
 399 default_translate_mode_attribute (machine_mode mode)
 400 {
 401   return mode;
 402 }
 403
 404 /* True if MODE is valid for the target.  By "valid", we mean able to
 405    be manipulated in non-trivial ways.  In particular, this means all
 406    the arithmetic is supported.
 407
 408    By default we guess this means that any C type is supported.  If
 409    we can't map the mode back to a type that would be available in C,
 410    then reject it.  Special case, here, is the double-word arithmetic
 411    supported by optabs.c.  */
 412
 413 bool
 414 default_scalar_mode_supported_p (scalar_mode mode)
 415 {
 416   int precision = GET_MODE_PRECISION (mode);
 417
 418   switch (GET_MODE_CLASS (mode))
 419     {
 420     case MODE_PARTIAL_INT:
 421     case MODE_INT:
 422       if (precision == CHAR_TYPE_SIZE)
 423         return true;
 424       if (precision == SHORT_TYPE_SIZE)
 425         return true;
 426       if (precision == INT_TYPE_SIZE)
 427         return true;
 428       if (precision == LONG_TYPE_SIZE)
 429         return true;
 430       if (precision == LONG_LONG_TYPE_SIZE)
 431         return true;
 432       if (precision == 2 * BITS_PER_WORD)
 433         return true;
 434       return false;
 435
 436     case MODE_FLOAT:
 437       if (precision == FLOAT_TYPE_SIZE)
 438         return true;
 439       if (precision == DOUBLE_TYPE_SIZE)
 440         return true;
 441       if (precision == LONG_DOUBLE_TYPE_SIZE)
 442         return true;
 443       return false;
 444
 445     case MODE_DECIMAL_FLOAT:
 446     case MODE_FRACT:
 447     case MODE_UFRACT:
 448     case MODE_ACCUM:
 449     case MODE_UACCUM:
 450       return false;
 451
 452     default:
 453       gcc_unreachable ();
 454     }
 455 }
 456
 457 /* Return true if libgcc supports floating-point mode MODE (known to
 458    be supported as a scalar mode).  */
 459
 460 bool
 461 default_libgcc_floating_mode_supported_p (scalar_float_mode mode)
 462 {
 463   switch (mode)
 464     {
 465 #ifdef HAVE_SFmode
 466     case E_SFmode:
 467 #endif
 468 #ifdef HAVE_DFmode
 469     case E_DFmode:
 470 #endif
 471 #ifdef HAVE_XFmode
 472     case E_XFmode:
 473 #endif
 474 #ifdef HAVE_TFmode
 475     case E_TFmode:
 476 #endif
 477       return true;
 478
 479     default:
 480       return false;
 481     }
 482 }
 483
 484 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
 485    false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
 486    supported.  */
 487 opt_scalar_float_mode
 488 default_floatn_mode (int n, bool extended)
 489 {
 490   if (extended)
 491     {
 492       opt_scalar_float_mode cand1, cand2;
 493       scalar_float_mode mode;
 494       switch (n)
 495         {
 496         case 32:
 497 #ifdef HAVE_DFmode
 498           cand1 = DFmode;
 499 #endif
 500           break;
 501
 502         case 64:
 503 #ifdef HAVE_XFmode
 504           cand1 = XFmode;
 505 #endif
 506 #ifdef HAVE_TFmode
 507           cand2 = TFmode;
 508 #endif
 509           break;
 510
 511         case 128:
 512           break;
 513
 514         default:
 515           /* Those are the only valid _FloatNx types.  */
 516           gcc_unreachable ();
 517         }
 518       if (cand1.exists (&mode)
 519           && REAL_MODE_FORMAT (mode)->ieee_bits > n
 520           && targetm.scalar_mode_supported_p (mode)
 521           && targetm.libgcc_floating_mode_supported_p (mode))
 522         return cand1;
 523       if (cand2.exists (&mode)
 524           && REAL_MODE_FORMAT (mode)->ieee_bits > n
 525           && targetm.scalar_mode_supported_p (mode)
 526           && targetm.libgcc_floating_mode_supported_p (mode))
 527         return cand2;
 528     }
 529   else
 530     {
 531       opt_scalar_float_mode cand;
 532       scalar_float_mode mode;
 533       switch (n)
 534         {
 535         case 16:
 536           /* Always enable _Float16 if we have basic support for the mode.
 537              Targets can control the range and precision of operations on
 538              the _Float16 type using TARGET_C_EXCESS_PRECISION.  */
 539 #ifdef HAVE_HFmode
 540           cand = HFmode;
 541 #endif
 542           break;
 543
 544         case 32:
 545 #ifdef HAVE_SFmode
 546           cand = SFmode;
 547 #endif
 548           break;
 549
 550         case 64:
 551 #ifdef HAVE_DFmode
 552           cand = DFmode;
 553 #endif
 554           break;
 555
 556         case 128:
 557 #ifdef HAVE_TFmode
 558           cand = TFmode;
 559 #endif
 560           break;
 561
 562         default:
 563           break;
 564         }
 565       if (cand.exists (&mode)
 566           && REAL_MODE_FORMAT (mode)->ieee_bits == n
 567           && targetm.scalar_mode_supported_p (mode)
 568           && targetm.libgcc_floating_mode_supported_p (mode))
 569         return cand;
 570     }
 571   return opt_scalar_float_mode ();
 572 }
 573
 574 /* Define this to return true if the _Floatn and _Floatnx built-in functions
 575    should implicitly enable the built-in function without the __builtin_ prefix
 576    in addition to the normal built-in function with the __builtin_ prefix.  The
 577    default is to only enable built-in functions without the __builtin_ prefix
 578    for the GNU C langauge.  The argument FUNC is the enum builtin_in_function
 579    id of the function to be enabled.  */
 580
 581 bool
 582 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED)
 583 {
 584   static bool first_time_p = true;
 585   static bool c_or_objective_c;
 586
 587   if (first_time_p)
 588     {
 589       first_time_p = false;
 590       c_or_objective_c = lang_GNU_C () || lang_GNU_OBJC ();
 591     }
 592
 593   return c_or_objective_c;
 594 }
 595
 596 /* Make some target macros useable by target-independent code.  */
 597 bool
 598 targhook_words_big_endian (void)
 599 {
 600   return !!WORDS_BIG_ENDIAN;
 601 }
 602
 603 bool
 604 targhook_float_words_big_endian (void)
 605 {
 606   return !!FLOAT_WORDS_BIG_ENDIAN;
 607 }
 608
 609 /* True if the target supports floating-point exceptions and rounding
 610    modes.  */
 611
 612 bool
 613 default_float_exceptions_rounding_supported_p (void)
 614 {
 615 #ifdef HAVE_adddf3
 616   return HAVE_adddf3;
 617 #else
 618   return false;
 619 #endif
 620 }
 621
 622 /* True if the target supports decimal floating point.  */
 623
 624 bool
 625 default_decimal_float_supported_p (void)
 626 {
 627   return ENABLE_DECIMAL_FLOAT;
 628 }
 629
 630 /* True if the target supports fixed-point arithmetic.  */
 631
 632 bool
 633 default_fixed_point_supported_p (void)
 634 {
 635   return ENABLE_FIXED_POINT;
 636 }
 637
 638 /* True if the target supports GNU indirect functions.  */
 639
 640 bool
 641 default_has_ifunc_p (void)
 642 {
 643   return HAVE_GNU_INDIRECT_FUNCTION;
 644 }
 645
 646 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
 647    an error message.
 648
 649    This function checks whether a given INSN is valid within a low-overhead
 650    loop.  If INSN is invalid it returns the reason for that, otherwise it
 651    returns NULL. A called function may clobber any special registers required
 652    for low-overhead looping. Additionally, some targets (eg, PPC) use the count
 653    register for branch on table instructions. We reject the doloop pattern in
 654    these cases.  */
 655
 656 const char *
 657 default_invalid_within_doloop (const rtx_insn *insn)
 658 {
 659   if (CALL_P (insn))
 660     return "Function call in loop.";
 661
 662   if (tablejump_p (insn, NULL, NULL) || computed_jump_p (insn))
 663     return "Computed branch in the loop.";
 664
 665   return NULL;
 666 }
 667
 668 /* Mapping of builtin functions to vectorized variants.  */
 669
 670 tree
 671 default_builtin_vectorized_function (unsigned int, tree, tree)
 672 {
 673   return NULL_TREE;
 674 }
 675
 676 /* Mapping of target builtin functions to vectorized variants.  */
 677
 678 tree
 679 default_builtin_md_vectorized_function (tree, tree, tree)
 680 {
 681   return NULL_TREE;
 682 }
 683
 684 /* Vectorized conversion.  */
 685
 686 tree
 687 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
 688                                        tree dest_type ATTRIBUTE_UNUSED,
 689                                        tree src_type ATTRIBUTE_UNUSED)
 690 {
 691   return NULL_TREE;
 692 }
 693
 694 /* Default vectorizer cost model values.  */
 695
 696 int
 697 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
 698                                     tree vectype,
 699                                     int misalign ATTRIBUTE_UNUSED)
 700 {
 701   switch (type_of_cost)
 702     {
 703       case scalar_stmt:
 704       case scalar_load:
 705       case scalar_store:
 706       case vector_stmt:
 707       case vector_load:
 708       case vector_store:
 709       case vec_to_scalar:
 710       case scalar_to_vec:
 711       case cond_branch_not_taken:
 712       case vec_perm:
 713       case vec_promote_demote:
 714         return 1;
 715
 716       case unaligned_load:
 717       case unaligned_store:
 718         return 2;
 719
 720       case cond_branch_taken:
 721         return 3;
 722
 723       case vec_construct:
 724         return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype)) - 1;
 725
 726       default:
 727         gcc_unreachable ();
 728     }
 729 }
 730
 731 /* Reciprocal.  */
 732
 733 tree
 734 default_builtin_reciprocal (tree)
 735 {
 736   return NULL_TREE;
 737 }
 738
 739 bool
 740 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
 741         cumulative_args_t ca ATTRIBUTE_UNUSED,
 742         machine_mode mode ATTRIBUTE_UNUSED,
 743         const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 744 {
 745   return false;
 746 }
 747
 748 bool
 749 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
 750         cumulative_args_t ca ATTRIBUTE_UNUSED,
 751         machine_mode mode ATTRIBUTE_UNUSED,
 752         const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 753 {
 754   return true;
 755 }
 756
 757 int
 758 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
 759         cumulative_args_t ca ATTRIBUTE_UNUSED,
 760         machine_mode mode ATTRIBUTE_UNUSED,
 761         tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
 762 {
 763   return 0;
 764 }
 765
 766 void
 767 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED,
 768                                 tree ATTRIBUTE_UNUSED)
 769 {
 770 }
 771
 772 void
 773 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED,
 774                               machine_mode mode ATTRIBUTE_UNUSED,
 775                               const_tree type ATTRIBUTE_UNUSED,
 776                               bool named ATTRIBUTE_UNUSED)
 777 {
 778   gcc_unreachable ();
 779 }
 780
 781 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET.  */
 782
 783 HOST_WIDE_INT
 784 default_function_arg_offset (machine_mode, const_tree)
 785 {
 786   return 0;
 787 }
 788
 789 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
 790    upward, but pad short args downward on big-endian machines.  */
 791
 792 pad_direction
 793 default_function_arg_padding (machine_mode mode, const_tree type)
 794 {
 795   if (!BYTES_BIG_ENDIAN)
 796     return PAD_UPWARD;
 797
 798   unsigned HOST_WIDE_INT size;
 799   if (mode == BLKmode)
 800     {
 801       if (!type || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
 802         return PAD_UPWARD;
 803       size = int_size_in_bytes (type);
 804     }
 805   else
 806     /* Targets with variable-sized modes must override this hook
 807        and handle variable-sized modes explicitly.  */
 808     size = GET_MODE_SIZE (mode).to_constant ();
 809
 810   if (size < (PARM_BOUNDARY / BITS_PER_UNIT))
 811     return PAD_DOWNWARD;
 812
 813   return PAD_UPWARD;
 814 }
 815
 816 rtx
 817 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 818                       machine_mode mode ATTRIBUTE_UNUSED,
 819                       const_tree type ATTRIBUTE_UNUSED,
 820                       bool named ATTRIBUTE_UNUSED)
 821 {
 822   gcc_unreachable ();
 823 }
 824
 825 rtx
 826 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
 827                                machine_mode mode ATTRIBUTE_UNUSED,
 828                                const_tree type ATTRIBUTE_UNUSED,
 829                                bool named ATTRIBUTE_UNUSED)
 830 {
 831   gcc_unreachable ();
 832 }
 833
 834 unsigned int
 835 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 836                                const_tree type ATTRIBUTE_UNUSED)
 837 {
 838   return PARM_BOUNDARY;
 839 }
 840
 841 unsigned int
 842 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED,
 843                                      const_tree type ATTRIBUTE_UNUSED)
 844 {
 845   return PARM_BOUNDARY;
 846 }
 847
 848 void
 849 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
 850 {
 851 }
 852
 853 const char *
 854 hook_invalid_arg_for_unprototyped_fn (
 855         const_tree typelist ATTRIBUTE_UNUSED,
 856         const_tree funcdecl ATTRIBUTE_UNUSED,
 857         const_tree val ATTRIBUTE_UNUSED)
 858 {
 859   return NULL;
 860 }
 861
 862 /* Initialize the stack protection decls.  */
 863
 864 /* Stack protection related decls living in libgcc.  */
 865 static GTY(()) tree stack_chk_guard_decl;
 866
 867 tree
 868 default_stack_protect_guard (void)
 869 {
 870   tree t = stack_chk_guard_decl;
 871
 872   if (t == NULL)
 873     {
 874       rtx x;
 875
 876       t = build_decl (UNKNOWN_LOCATION,
 877                       VAR_DECL, get_identifier ("__stack_chk_guard"),
 878                       ptr_type_node);
 879       TREE_STATIC (t) = 1;
 880       TREE_PUBLIC (t) = 1;
 881       DECL_EXTERNAL (t) = 1;
 882       TREE_USED (t) = 1;
 883       TREE_THIS_VOLATILE (t) = 1;
 884       DECL_ARTIFICIAL (t) = 1;
 885       DECL_IGNORED_P (t) = 1;
 886
 887       /* Do not share RTL as the declaration is visible outside of
 888          current function.  */
 889       x = DECL_RTL (t);
 890       RTX_FLAG (x, used) = 1;
 891
 892       stack_chk_guard_decl = t;
 893     }
 894
 895   return t;
 896 }
 897
 898 static GTY(()) tree stack_chk_fail_decl;
 899
 900 tree
 901 default_external_stack_protect_fail (void)
 902 {
 903   tree t = stack_chk_fail_decl;
 904
 905   if (t == NULL_TREE)
 906     {
 907       t = build_function_type_list (void_type_node, NULL_TREE);
 908       t = build_decl (UNKNOWN_LOCATION,
 909                       FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
 910       TREE_STATIC (t) = 1;
 911       TREE_PUBLIC (t) = 1;
 912       DECL_EXTERNAL (t) = 1;
 913       TREE_USED (t) = 1;
 914       TREE_THIS_VOLATILE (t) = 1;
 915       TREE_NOTHROW (t) = 1;
 916       DECL_ARTIFICIAL (t) = 1;
 917       DECL_IGNORED_P (t) = 1;
 918       DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
 919       DECL_VISIBILITY_SPECIFIED (t) = 1;
 920
 921       stack_chk_fail_decl = t;
 922     }
 923
 924   return build_call_expr (t, 0);
 925 }
 926
 927 tree
 928 default_hidden_stack_protect_fail (void)
 929 {
 930 #ifndef HAVE_GAS_HIDDEN
 931   return default_external_stack_protect_fail ();
 932 #else
 933   tree t = stack_chk_fail_decl;
 934
 935   if (!flag_pic)
 936     return default_external_stack_protect_fail ();
 937
 938   if (t == NULL_TREE)
 939     {
 940       t = build_function_type_list (void_type_node, NULL_TREE);
 941       t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
 942                       get_identifier ("__stack_chk_fail_local"), t);
 943       TREE_STATIC (t) = 1;
 944       TREE_PUBLIC (t) = 1;
 945       DECL_EXTERNAL (t) = 1;
 946       TREE_USED (t) = 1;
 947       TREE_THIS_VOLATILE (t) = 1;
 948       TREE_NOTHROW (t) = 1;
 949       DECL_ARTIFICIAL (t) = 1;
 950       DECL_IGNORED_P (t) = 1;
 951       DECL_VISIBILITY_SPECIFIED (t) = 1;
 952       DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
 953
 954       stack_chk_fail_decl = t;
 955     }
 956
 957   return build_call_expr (t, 0);
 958 #endif
 959 }
 960
 961 bool
 962 hook_bool_const_rtx_commutative_p (const_rtx x,
 963                                    int outer_code ATTRIBUTE_UNUSED)
 964 {
 965   return COMMUTATIVE_P (x);
 966 }
 967
 968 rtx
 969 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
 970                         const_tree fn_decl_or_type,
 971                         bool outgoing ATTRIBUTE_UNUSED)
 972 {
 973   /* The old interface doesn't handle receiving the function type.  */
 974   if (fn_decl_or_type
 975       && !DECL_P (fn_decl_or_type))
 976     fn_decl_or_type = NULL;
 977
 978 #ifdef FUNCTION_VALUE
 979   return FUNCTION_VALUE (ret_type, fn_decl_or_type);
 980 #else
 981   gcc_unreachable ();
 982 #endif
 983 }
 984
 985 rtx
 986 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED,
 987                        const_rtx fun ATTRIBUTE_UNUSED)
 988 {
 989 #ifdef LIBCALL_VALUE
 990   return LIBCALL_VALUE (MACRO_MODE (mode));
 991 #else
 992   gcc_unreachable ();
 993 #endif
 994 }
 995
 996 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P.  */
 997
 998 bool
 999 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
1000 {
1001 #ifdef FUNCTION_VALUE_REGNO_P
1002   return FUNCTION_VALUE_REGNO_P (regno);
1003 #else
1004   gcc_unreachable ();
1005 #endif
1006 }
1007
1008 rtx
1009 default_internal_arg_pointer (void)
1010 {
1011   /* If the reg that the virtual arg pointer will be translated into is
1012      not a fixed reg or is the stack pointer, make a copy of the virtual
1013      arg pointer, and address parms via the copy.  The frame pointer is
1014      considered fixed even though it is not marked as such.  */
1015   if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
1016        || ! (fixed_regs[ARG_POINTER_REGNUM]
1017              || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
1018     return copy_to_reg (virtual_incoming_args_rtx);
1019   else
1020     return virtual_incoming_args_rtx;
1021 }
1022
1023 rtx
1024 default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
1025 {
1026   if (incoming_p)
1027     {
1028 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1029       return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
1030 #endif
1031     }
1032
1033 #ifdef STATIC_CHAIN_REGNUM
1034   return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
1035 #endif
1036
1037   {
1038     static bool issued_error;
1039     if (!issued_error)
1040       {
1041         issued_error = true;
1042         sorry ("nested functions not supported on this target");
1043       }
1044
1045     /* It really doesn't matter what we return here, so long at it
1046        doesn't cause the rest of the compiler to crash.  */
1047     return gen_rtx_MEM (Pmode, stack_pointer_rtx);
1048   }
1049 }
1050
1051 void
1052 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
1053                          rtx ARG_UNUSED (r_chain))
1054 {
1055   sorry ("nested function trampolines not supported on this target");
1056 }
1057
1058 poly_int64
1059 default_return_pops_args (tree, tree, poly_int64)
1060 {
1061   return 0;
1062 }
1063
1064 reg_class_t
1065 default_branch_target_register_class (void)
1066 {
1067   return NO_REGS;
1068 }
1069
1070 reg_class_t
1071 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED,
1072                                          reg_class_t cl,
1073                                          reg_class_t best_cl ATTRIBUTE_UNUSED)
1074 {
1075   return cl;
1076 }
1077
1078 extern bool
1079 default_lra_p (void)
1080 {
1081   return true;
1082 }
1083
1084 int
1085 default_register_priority (int hard_regno ATTRIBUTE_UNUSED)
1086 {
1087   return 0;
1088 }
1089
1090 extern bool
1091 default_register_usage_leveling_p (void)
1092 {
1093   return false;
1094 }
1095
1096 extern bool
1097 default_different_addr_displacement_p (void)
1098 {
1099   return false;
1100 }
1101
1102 reg_class_t
1103 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
1104                           reg_class_t reload_class_i ATTRIBUTE_UNUSED,
1105                           machine_mode reload_mode ATTRIBUTE_UNUSED,
1106                           secondary_reload_info *sri)
1107 {
1108   enum reg_class rclass = NO_REGS;
1109   enum reg_class reload_class = (enum reg_class) reload_class_i;
1110
1111   if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
1112     {
1113       sri->icode = sri->prev_sri->t_icode;
1114       return NO_REGS;
1115     }
1116 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1117   if (in_p)
1118     rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class,
1119                                            MACRO_MODE (reload_mode), x);
1120 #endif
1121 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1122   if (! in_p)
1123     rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class,
1124                                             MACRO_MODE (reload_mode), x);
1125 #endif
1126   if (rclass != NO_REGS)
1127     {
1128       enum insn_code icode
1129         = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
1130                                 reload_mode);
1131
1132       if (icode != CODE_FOR_nothing
1133           && !insn_operand_matches (icode, in_p, x))
1134         icode = CODE_FOR_nothing;
1135       else if (icode != CODE_FOR_nothing)
1136         {
1137           const char *insn_constraint, *scratch_constraint;
1138           enum reg_class insn_class, scratch_class;
1139
1140           gcc_assert (insn_data[(int) icode].n_operands == 3);
1141           insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
1142           if (!*insn_constraint)
1143             insn_class = ALL_REGS;
1144           else
1145             {
1146               if (in_p)
1147                 {
1148                   gcc_assert (*insn_constraint == '=');
1149                   insn_constraint++;
1150                 }
1151               insn_class = (reg_class_for_constraint
1152                             (lookup_constraint (insn_constraint)));
1153               gcc_assert (insn_class != NO_REGS);
1154             }
1155
1156           scratch_constraint = insn_data[(int) icode].operand[2].constraint;
1157           /* The scratch register's constraint must start with "=&",
1158              except for an input reload, where only "=" is necessary,
1159              and where it might be beneficial to re-use registers from
1160              the input.  */
1161           gcc_assert (scratch_constraint[0] == '='
1162                       && (in_p || scratch_constraint[1] == '&'));
1163           scratch_constraint++;
1164           if (*scratch_constraint == '&')
1165             scratch_constraint++;
1166           scratch_class = (reg_class_for_constraint
1167                            (lookup_constraint (scratch_constraint)));
1168
1169           if (reg_class_subset_p (reload_class, insn_class))
1170             {
1171               gcc_assert (scratch_class == rclass);
1172               rclass = NO_REGS;
1173             }
1174           else
1175             rclass = insn_class;
1176
1177         }
1178       if (rclass == NO_REGS)
1179         sri->icode = icode;
1180       else
1181         sri->t_icode = icode;
1182     }
1183   return rclass;
1184 }
1185
1186 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE.  */
1187
1188 machine_mode
1189 default_secondary_memory_needed_mode (machine_mode mode)
1190 {
1191   if (!targetm.lra_p ()
1192       && known_lt (GET_MODE_BITSIZE (mode), BITS_PER_WORD)
1193       && INTEGRAL_MODE_P (mode))
1194     return mode_for_size (BITS_PER_WORD, GET_MODE_CLASS (mode), 0).require ();
1195   return mode;
1196 }
1197
1198 /* By default, if flag_pic is true, then neither local nor global relocs
1199    should be placed in readonly memory.  */
1200
1201 int
1202 default_reloc_rw_mask (void)
1203 {
1204   return flag_pic ? 3 : 0;
1205 }
1206
1207 /* By default, address diff vectors are generated
1208 for jump tables when flag_pic is true.  */
1209
1210 bool
1211 default_generate_pic_addr_diff_vec (void)
1212 {
1213   return flag_pic;
1214 }
1215
1216 /* By default, do no modification. */
1217 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
1218                                          tree id)
1219 {
1220    return id;
1221 }
1222
1223 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT.  */
1224
1225 HOST_WIDE_INT
1226 default_static_rtx_alignment (machine_mode mode)
1227 {
1228   return GET_MODE_ALIGNMENT (mode);
1229 }
1230
1231 /* The default implementation of TARGET_CONSTANT_ALIGNMENT.  */
1232
1233 HOST_WIDE_INT
1234 default_constant_alignment (const_tree, HOST_WIDE_INT align)
1235 {
1236   return align;
1237 }
1238
1239 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1240    to at least BITS_PER_WORD but otherwise makes no changes.  */
1241
1242 HOST_WIDE_INT
1243 constant_alignment_word_strings (const_tree exp, HOST_WIDE_INT align)
1244 {
1245   if (TREE_CODE (exp) == STRING_CST)
1246     return MAX (align, BITS_PER_WORD);
1247   return align;
1248 }
1249
1250 /* Default to natural alignment for vector types.  */
1251 HOST_WIDE_INT
1252 default_vector_alignment (const_tree type)
1253 {
1254   HOST_WIDE_INT align = tree_to_shwi (TYPE_SIZE (type));
1255   if (align > MAX_OFILE_ALIGNMENT)
1256     align = MAX_OFILE_ALIGNMENT;
1257   return align;
1258 }
1259
1260 /* The default implementation of
1261    TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT.  */
1262
1263 poly_uint64
1264 default_preferred_vector_alignment (const_tree type)
1265 {
1266   return TYPE_ALIGN (type);
1267 }
1268
1269 /* By default assume vectors of element TYPE require a multiple of the natural
1270    alignment of TYPE.  TYPE is naturally aligned if IS_PACKED is false.  */
1271 bool
1272 default_builtin_vector_alignment_reachable (const_tree /*type*/, bool is_packed)
1273 {
1274   return ! is_packed;
1275 }
1276
1277 /* By default, assume that a target supports any factor of misalignment
1278    memory access if it supports movmisalign patten.
1279    is_packed is true if the memory access is defined in a packed struct.  */
1280 bool
1281 default_builtin_support_vector_misalignment (machine_mode mode,
1282                                              const_tree type
1283                                              ATTRIBUTE_UNUSED,
1284                                              int misalignment
1285                                              ATTRIBUTE_UNUSED,
1286                                              bool is_packed
1287                                              ATTRIBUTE_UNUSED)
1288 {
1289   if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1290     return true;
1291   return false;
1292 }
1293
1294 /* By default, only attempt to parallelize bitwise operations, and
1295    possibly adds/subtracts using bit-twiddling.  */
1296
1297 machine_mode
1298 default_preferred_simd_mode (scalar_mode)
1299 {
1300   return word_mode;
1301 }
1302
1303 /* By default do not split reductions further.  */
1304
1305 machine_mode
1306 default_split_reduction (machine_mode mode)
1307 {
1308   return mode;
1309 }
1310
1311 /* By default only the size derived from the preferred vector mode
1312    is tried.  */
1313
1314 void
1315 default_autovectorize_vector_sizes (vector_sizes *)
1316 {
1317 }
1318
1319 /* By default a vector of integers is used as a mask.  */
1320
1321 opt_machine_mode
1322 default_get_mask_mode (poly_uint64 nunits, poly_uint64 vector_size)
1323 {
1324   unsigned int elem_size = vector_element_size (vector_size, nunits);
1325   scalar_int_mode elem_mode
1326     = smallest_int_mode_for_size (elem_size * BITS_PER_UNIT);
1327   machine_mode vector_mode;
1328
1329   gcc_assert (known_eq (elem_size * nunits, vector_size));
1330
1331   if (mode_for_vector (elem_mode, nunits).exists (&vector_mode)
1332       && VECTOR_MODE_P (vector_mode)
1333       && targetm.vector_mode_supported_p (vector_mode))
1334     return vector_mode;
1335
1336   return opt_machine_mode ();
1337 }
1338
1339 /* By default consider masked stores to be expensive.  */
1340
1341 bool
1342 default_empty_mask_is_expensive (unsigned ifn)
1343 {
1344   return ifn == IFN_MASK_STORE;
1345 }
1346
1347 /* By default, the cost model accumulates three separate costs (prologue,
1348    loop body, and epilogue) for a vectorized loop or block.  So allocate an
1349    array of three unsigned ints, set it to zero, and return its address.  */
1350
1351 void *
1352 default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED)
1353 {
1354   unsigned *cost = XNEWVEC (unsigned, 3);
1355   cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0;
1356   return cost;
1357 }
1358
1359 /* By default, the cost model looks up the cost of the given statement
1360    kind and mode, multiplies it by the occurrence count, accumulates
1361    it into the cost specified by WHERE, and returns the cost added.  */
1362
1363 unsigned
1364 default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
1365                        struct _stmt_vec_info *stmt_info, int misalign,
1366                        enum vect_cost_model_location where)
1367 {
1368   unsigned *cost = (unsigned *) data;
1369   unsigned retval = 0;
1370
1371   tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE;
1372   int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype,
1373                                                                 misalign);
1374    /* Statements in an inner loop relative to the loop being
1375       vectorized are weighted more heavily.  The value here is
1376       arbitrary and could potentially be improved with analysis.  */
1377   if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info))
1378     count *= 50;  /* FIXME.  */
1379
1380   retval = (unsigned) (count * stmt_cost);
1381   cost[where] += retval;
1382
1383   return retval;
1384 }
1385
1386 /* By default, the cost model just returns the accumulated costs.  */
1387
1388 void
1389 default_finish_cost (void *data, unsigned *prologue_cost,
1390                      unsigned *body_cost, unsigned *epilogue_cost)
1391 {
1392   unsigned *cost = (unsigned *) data;
1393   *prologue_cost = cost[vect_prologue];
1394   *body_cost     = cost[vect_body];
1395   *epilogue_cost = cost[vect_epilogue];
1396 }
1397
1398 /* Free the cost data.  */
1399
1400 void
1401 default_destroy_cost_data (void *data)
1402 {
1403   free (data);
1404 }
1405
1406 /* Determine whether or not a pointer mode is valid. Assume defaults
1407    of ptr_mode or Pmode - can be overridden.  */
1408 bool
1409 default_valid_pointer_mode (scalar_int_mode mode)
1410 {
1411   return (mode == ptr_mode || mode == Pmode);
1412 }
1413
1414 /* Determine whether the memory reference specified by REF may alias
1415    the C libraries errno location.  */
1416 bool
1417 default_ref_may_alias_errno (ao_ref *ref)
1418 {
1419   tree base = ao_ref_base (ref);
1420   /* The default implementation assumes the errno location is
1421      a declaration of type int or is always accessed via a
1422      pointer to int.  We assume that accesses to errno are
1423      not deliberately obfuscated (even in conforming ways).  */
1424   if (TYPE_UNSIGNED (TREE_TYPE (base))
1425       || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1426     return false;
1427   /* The default implementation assumes an errno location
1428      declaration is never defined in the current compilation unit.  */
1429   if (DECL_P (base)
1430       && !TREE_STATIC (base))
1431     return true;
1432   else if (TREE_CODE (base) == MEM_REF
1433            && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1434     {
1435       struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1436       return !pi || pi->pt.anything || pi->pt.nonlocal;
1437     }
1438   return false;
1439 }
1440
1441 /* Return the mode for a pointer to a given ADDRSPACE,
1442    defaulting to ptr_mode for all address spaces.  */
1443
1444 scalar_int_mode
1445 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1446 {
1447   return ptr_mode;
1448 }
1449
1450 /* Return the mode for an address in a given ADDRSPACE,
1451    defaulting to Pmode for all address spaces.  */
1452
1453 scalar_int_mode
1454 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1455 {
1456   return Pmode;
1457 }
1458
1459 /* Named address space version of valid_pointer_mode.
1460    To match the above, the same modes apply to all address spaces.  */
1461
1462 bool
1463 default_addr_space_valid_pointer_mode (scalar_int_mode mode,
1464                                        addr_space_t as ATTRIBUTE_UNUSED)
1465 {
1466   return targetm.valid_pointer_mode (mode);
1467 }
1468
1469 /* Some places still assume that all pointer or address modes are the
1470    standard Pmode and ptr_mode.  These optimizations become invalid if
1471    the target actually supports multiple different modes.  For now,
1472    we disable such optimizations on such targets, using this function.  */
1473
1474 bool
1475 target_default_pointer_address_modes_p (void)
1476 {
1477   if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1478     return false;
1479   if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1480     return false;
1481
1482   return true;
1483 }
1484
1485 /* Named address space version of legitimate_address_p.
1486    By default, all address spaces have the same form.  */
1487
1488 bool
1489 default_addr_space_legitimate_address_p (machine_mode mode, rtx mem,
1490                                          bool strict,
1491                                          addr_space_t as ATTRIBUTE_UNUSED)
1492 {
1493   return targetm.legitimate_address_p (mode, mem, strict);
1494 }
1495
1496 /* Named address space version of LEGITIMIZE_ADDRESS.
1497    By default, all address spaces have the same form.  */
1498
1499 rtx
1500 default_addr_space_legitimize_address (rtx x, rtx oldx, machine_mode mode,
1501                                        addr_space_t as ATTRIBUTE_UNUSED)
1502 {
1503   return targetm.legitimize_address (x, oldx, mode);
1504 }
1505
1506 /* The default hook for determining if one named address space is a subset of
1507    another and to return which address space to use as the common address
1508    space.  */
1509
1510 bool
1511 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1512 {
1513   return (subset == superset);
1514 }
1515
1516 /* The default hook for determining if 0 within a named address
1517    space is a valid address.  */
1518
1519 bool
1520 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED)
1521 {
1522   return false;
1523 }
1524
1525 /* The default hook for debugging the address space is to return the
1526    address space number to indicate DW_AT_address_class.  */
1527 int
1528 default_addr_space_debug (addr_space_t as)
1529 {
1530   return as;
1531 }
1532
1533 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1534    Don't complain about any address space.  */
1535
1536 void
1537 default_addr_space_diagnose_usage (addr_space_t, location_t)
1538 {
1539 }
1540
1541
1542 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1543    called for targets with only a generic address space.  */
1544
1545 rtx
1546 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1547                             tree from_type ATTRIBUTE_UNUSED,
1548                             tree to_type ATTRIBUTE_UNUSED)
1549 {
1550   gcc_unreachable ();
1551 }
1552
1553 /* The defualt implementation of TARGET_HARD_REGNO_NREGS.  */
1554
1555 unsigned int
1556 default_hard_regno_nregs (unsigned int, machine_mode mode)
1557 {
1558   /* Targets with variable-sized modes must provide their own definition
1559      of this hook.  */
1560   return CEIL (GET_MODE_SIZE (mode).to_constant (), UNITS_PER_WORD);
1561 }
1562
1563 bool
1564 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1565 {
1566   return true;
1567 }
1568
1569 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P.  */
1570
1571 bool
1572 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED,
1573                                   addr_space_t addrspace ATTRIBUTE_UNUSED)
1574 {
1575   return false;
1576 }
1577
1578 bool
1579 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1580                                          tree ARG_UNUSED (name),
1581                                          tree ARG_UNUSED (args),
1582                                          int ARG_UNUSED (flags))
1583 {
1584   warning (OPT_Wattributes,
1585            "target attribute is not supported on this machine");
1586
1587   return false;
1588 }
1589
1590 bool
1591 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1592                                     tree ARG_UNUSED (pop_target))
1593 {
1594   /* If args is NULL the caller is handle_pragma_pop_options ().  In that case,
1595      emit no warning because "#pragma GCC pop_target" is valid on targets that
1596      do not have the "target" pragma.  */
1597   if (args)
1598     warning (OPT_Wpragmas,
1599              "#pragma GCC target is not supported for this machine");
1600
1601   return false;
1602 }
1603
1604 bool
1605 default_target_can_inline_p (tree caller, tree callee)
1606 {
1607   tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1608   tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1609   if (! callee_opts)
1610     callee_opts = target_option_default_node;
1611   if (! caller_opts)
1612     caller_opts = target_option_default_node;
1613
1614   /* If both caller and callee have attributes, assume that if the
1615      pointer is different, the two functions have different target
1616      options since build_target_option_node uses a hash table for the
1617      options.  */
1618   return callee_opts == caller_opts;
1619 }
1620
1621 /* If the machine does not have a case insn that compares the bounds,
1622    this means extra overhead for dispatch tables, which raises the
1623    threshold for using them.  */
1624
1625 unsigned int
1626 default_case_values_threshold (void)
1627 {
1628   return (targetm.have_casesi () ? 4 : 5);
1629 }
1630
1631 bool
1632 default_have_conditional_execution (void)
1633 {
1634   return HAVE_conditional_execution;
1635 }
1636
1637 /* By default we assume that c99 functions are present at the runtime,
1638    but sincos is not.  */
1639 bool
1640 default_libc_has_function (enum function_class fn_class)
1641 {
1642   if (fn_class == function_c94
1643       || fn_class == function_c99_misc
1644       || fn_class == function_c99_math_complex)
1645     return true;
1646
1647   return false;
1648 }
1649
1650 bool
1651 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1652 {
1653   return true;
1654 }
1655
1656 bool
1657 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1658 {
1659   return false;
1660 }
1661
1662 tree
1663 default_builtin_tm_load_store (tree ARG_UNUSED (type))
1664 {
1665   return NULL_TREE;
1666 }
1667
1668 /* Compute cost of moving registers to/from memory.  */
1669
1670 int
1671 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1672                           reg_class_t rclass ATTRIBUTE_UNUSED,
1673                           bool in ATTRIBUTE_UNUSED)
1674 {
1675 #ifndef MEMORY_MOVE_COST
1676     return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1677 #else
1678     return MEMORY_MOVE_COST (MACRO_MODE (mode), (enum reg_class) rclass, in);
1679 #endif
1680 }
1681
1682 /* Compute cost of moving data from a register of class FROM to one of
1683    TO, using MODE.  */
1684
1685 int
1686 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1687                             reg_class_t from ATTRIBUTE_UNUSED,
1688                             reg_class_t to ATTRIBUTE_UNUSED)
1689 {
1690 #ifndef REGISTER_MOVE_COST
1691   return 2;
1692 #else
1693   return REGISTER_MOVE_COST (MACRO_MODE (mode),
1694                              (enum reg_class) from, (enum reg_class) to);
1695 #endif
1696 }
1697
1698 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS.  */
1699
1700 bool
1701 default_slow_unaligned_access (machine_mode, unsigned int)
1702 {
1703   return STRICT_ALIGNMENT;
1704 }
1705
1706 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE.  */
1707
1708 HOST_WIDE_INT
1709 default_estimated_poly_value (poly_int64 x)
1710 {
1711   return x.coeffs[0];
1712 }
1713
1714 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1715    behavior.  SPEED_P is true if we are compiling for speed.  */
1716
1717 unsigned int
1718 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED)
1719 {
1720   unsigned int move_ratio;
1721 #ifdef MOVE_RATIO
1722   move_ratio = (unsigned int) MOVE_RATIO (speed_p);
1723 #else
1724 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1725   move_ratio = 2;
1726 #else /* No movmem patterns, pick a default.  */
1727   move_ratio = ((speed_p) ? 15 : 3);
1728 #endif
1729 #endif
1730   return move_ratio;
1731 }
1732
1733 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1734    used; return FALSE if the movmem/setmem optab should be expanded, or
1735    a call to memcpy emitted.  */
1736
1737 bool
1738 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
1739                                         unsigned int alignment,
1740                                         enum by_pieces_operation op,
1741                                         bool speed_p)
1742 {
1743   unsigned int max_size = 0;
1744   unsigned int ratio = 0;
1745
1746   switch (op)
1747     {
1748     case CLEAR_BY_PIECES:
1749       max_size = STORE_MAX_PIECES;
1750       ratio = CLEAR_RATIO (speed_p);
1751       break;
1752     case MOVE_BY_PIECES:
1753       max_size = MOVE_MAX_PIECES;
1754       ratio = get_move_ratio (speed_p);
1755       break;
1756     case SET_BY_PIECES:
1757       max_size = STORE_MAX_PIECES;
1758       ratio = SET_RATIO (speed_p);
1759       break;
1760     case STORE_BY_PIECES:
1761       max_size = STORE_MAX_PIECES;
1762       ratio = get_move_ratio (speed_p);
1763       break;
1764     case COMPARE_BY_PIECES:
1765       max_size = COMPARE_MAX_PIECES;
1766       /* Pick a likely default, just as in get_move_ratio.  */
1767       ratio = speed_p ? 15 : 3;
1768       break;
1769     }
1770
1771   return by_pieces_ninsns (size, alignment, max_size + 1, op) < ratio;
1772 }
1773
1774 /* This hook controls code generation for expanding a memcmp operation by
1775    pieces.  Return 1 for the normal pattern of compare/jump after each pair
1776    of loads, or a higher number to reduce the number of branches.  */
1777
1778 int
1779 default_compare_by_pieces_branch_ratio (machine_mode)
1780 {
1781   return 1;
1782 }
1783
1784 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1785    entry.  If RECORD_P is true and the target supports named sections,
1786    the location of the NOPs will be recorded in a special object section
1787    called "__patchable_function_entries".  This routine may be called
1788    twice per function to put NOPs before and after the function
1789    entry.  */
1790
1791 void
1792 default_print_patchable_function_entry (FILE *file,
1793                                         unsigned HOST_WIDE_INT patch_area_size,
1794                                         bool record_p)
1795 {
1796   const char *nop_templ = 0;
1797   int code_num;
1798   rtx_insn *my_nop = make_insn_raw (gen_nop ());
1799
1800   /* We use the template alone, relying on the (currently sane) assumption
1801      that the NOP template does not have variable operands.  */
1802   code_num = recog_memoized (my_nop);
1803   nop_templ = get_insn_template (code_num, my_nop);
1804
1805   if (record_p && targetm_common.have_named_sections)
1806     {
1807       char buf[256];
1808       static int patch_area_number;
1809       section *previous_section = in_section;
1810       const char *asm_op = integer_asm_op (POINTER_SIZE_UNITS, false);
1811
1812       gcc_assert (asm_op != NULL);
1813       patch_area_number++;
1814       ASM_GENERATE_INTERNAL_LABEL (buf, "LPFE", patch_area_number);
1815
1816       switch_to_section (get_section ("__patchable_function_entries",
1817                                       0, NULL));
1818       fputs (asm_op, file);
1819       assemble_name_raw (file, buf);
1820       fputc ('\n', file);
1821
1822       switch_to_section (previous_section);
1823       ASM_OUTPUT_LABEL (file, buf);
1824     }
1825
1826   unsigned i;
1827   for (i = 0; i < patch_area_size; ++i)
1828     fprintf (file, "\t%s\n", nop_templ);
1829 }
1830
1831 bool
1832 default_profile_before_prologue (void)
1833 {
1834 #ifdef PROFILE_BEFORE_PROLOGUE
1835   return true;
1836 #else
1837   return false;
1838 #endif
1839 }
1840
1841 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS.  */
1842
1843 reg_class_t
1844 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1845                                 reg_class_t rclass)
1846 {
1847 #ifdef PREFERRED_RELOAD_CLASS
1848   return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1849 #else
1850   return rclass;
1851 #endif
1852 }
1853
1854 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS.  */
1855
1856 reg_class_t
1857 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1858                                        reg_class_t rclass)
1859 {
1860   return rclass;
1861 }
1862
1863 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS.  */
1864 reg_class_t
1865 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1866 {
1867   return NO_REGS;
1868 }
1869
1870 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P.  */
1871
1872 bool
1873 default_class_likely_spilled_p (reg_class_t rclass)
1874 {
1875   return (reg_class_size[(int) rclass] == 1);
1876 }
1877
1878 /* The default implementation of TARGET_CLASS_MAX_NREGS.  */
1879
1880 unsigned char
1881 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1882                          machine_mode mode ATTRIBUTE_UNUSED)
1883 {
1884 #ifdef CLASS_MAX_NREGS
1885   return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass,
1886                                           MACRO_MODE (mode));
1887 #else
1888   /* Targets with variable-sized modes must provide their own definition
1889      of this hook.  */
1890   unsigned int size = GET_MODE_SIZE (mode).to_constant ();
1891   return (size + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
1892 #endif
1893 }
1894
1895 /* Determine the debugging unwind mechanism for the target.  */
1896
1897 enum unwind_info_type
1898 default_debug_unwind_info (void)
1899 {
1900   /* If the target wants to force the use of dwarf2 unwind info, let it.  */
1901   /* ??? Change all users to the hook, then poison this.  */
1902 #ifdef DWARF2_FRAME_INFO
1903   if (DWARF2_FRAME_INFO)
1904     return UI_DWARF2;
1905 #endif
1906
1907   /* Otherwise, only turn it on if dwarf2 debugging is enabled.  */
1908 #ifdef DWARF2_DEBUGGING_INFO
1909   if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1910     return UI_DWARF2;
1911 #endif
1912
1913   return UI_NONE;
1914 }
1915
1916 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1917    must define this hook.  */
1918
1919 unsigned int
1920 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1921 {
1922   gcc_unreachable ();
1923 }
1924
1925 /* Determine the correct mode for a Dwarf frame register that represents
1926    register REGNO.  */
1927
1928 machine_mode
1929 default_dwarf_frame_reg_mode (int regno)
1930 {
1931   machine_mode save_mode = reg_raw_mode[regno];
1932
1933   if (targetm.hard_regno_call_part_clobbered (regno, save_mode))
1934     save_mode = choose_hard_reg_mode (regno, 1, true);
1935   return save_mode;
1936 }
1937
1938 /* To be used by targets where reg_raw_mode doesn't return the right
1939    mode for registers used in apply_builtin_return and apply_builtin_arg.  */
1940
1941 fixed_size_mode
1942 default_get_reg_raw_mode (int regno)
1943 {
1944   /* Targets must override this hook if the underlying register is
1945      variable-sized.  */
1946   return as_a <fixed_size_mode> (reg_raw_mode[regno]);
1947 }
1948
1949 /* Return true if a leaf function should stay leaf even with profiling
1950    enabled.  */
1951
1952 bool
1953 default_keep_leaf_when_profiled ()
1954 {
1955   return false;
1956 }
1957
1958 /* Return true if the state of option OPTION should be stored in PCH files
1959    and checked by default_pch_valid_p.  Store the option's current state
1960    in STATE if so.  */
1961
1962 static inline bool
1963 option_affects_pch_p (int option, struct cl_option_state *state)
1964 {
1965   if ((cl_options[option].flags & CL_TARGET) == 0)
1966     return false;
1967   if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
1968     return false;
1969   if (option_flag_var (option, &global_options) == &target_flags)
1970     if (targetm.check_pch_target_flags)
1971       return false;
1972   return get_option_state (&global_options, option, state);
1973 }
1974
1975 /* Default version of get_pch_validity.
1976    By default, every flag difference is fatal; that will be mostly right for
1977    most targets, but completely right for very few.  */
1978
1979 void *
1980 default_get_pch_validity (size_t *sz)
1981 {
1982   struct cl_option_state state;
1983   size_t i;
1984   char *result, *r;
1985
1986   *sz = 2;
1987   if (targetm.check_pch_target_flags)
1988     *sz += sizeof (target_flags);
1989   for (i = 0; i < cl_options_count; i++)
1990     if (option_affects_pch_p (i, &state))
1991       *sz += state.size;
1992
1993   result = r = XNEWVEC (char, *sz);
1994   r[0] = flag_pic;
1995   r[1] = flag_pie;
1996   r += 2;
1997   if (targetm.check_pch_target_flags)
1998     {
1999       memcpy (r, &target_flags, sizeof (target_flags));
2000       r += sizeof (target_flags);
2001     }
2002
2003   for (i = 0; i < cl_options_count; i++)
2004     if (option_affects_pch_p (i, &state))
2005       {
2006         memcpy (r, state.data, state.size);
2007         r += state.size;
2008       }
2009
2010   return result;
2011 }
2012
2013 /* Return a message which says that a PCH file was created with a different
2014    setting of OPTION.  */
2015
2016 static const char *
2017 pch_option_mismatch (const char *option)
2018 {
2019   return xasprintf (_("created and used with differing settings of '%s'"),
2020                     option);
2021 }
2022
2023 /* Default version of pch_valid_p.  */
2024
2025 const char *
2026 default_pch_valid_p (const void *data_p, size_t len)
2027 {
2028   struct cl_option_state state;
2029   const char *data = (const char *)data_p;
2030   size_t i;
2031
2032   /* -fpic and -fpie also usually make a PCH invalid.  */
2033   if (data[0] != flag_pic)
2034     return _("created and used with different settings of -fpic");
2035   if (data[1] != flag_pie)
2036     return _("created and used with different settings of -fpie");
2037   data += 2;
2038
2039   /* Check target_flags.  */
2040   if (targetm.check_pch_target_flags)
2041     {
2042       int tf;
2043       const char *r;
2044
2045       memcpy (&tf, data, sizeof (target_flags));
2046       data += sizeof (target_flags);
2047       len -= sizeof (target_flags);
2048       r = targetm.check_pch_target_flags (tf);
2049       if (r != NULL)
2050         return r;
2051     }
2052
2053   for (i = 0; i < cl_options_count; i++)
2054     if (option_affects_pch_p (i, &state))
2055       {
2056         if (memcmp (data, state.data, state.size) != 0)
2057           return pch_option_mismatch (cl_options[i].opt_text);
2058         data += state.size;
2059         len -= state.size;
2060       }
2061
2062   return NULL;
2063 }
2064
2065 /* Default version of cstore_mode.  */
2066
2067 scalar_int_mode
2068 default_cstore_mode (enum insn_code icode)
2069 {
2070   return as_a <scalar_int_mode> (insn_data[(int) icode].operand[0].mode);
2071 }
2072
2073 /* Default version of member_type_forces_blk.  */
2074
2075 bool
2076 default_member_type_forces_blk (const_tree, machine_mode)
2077 {
2078   return false;
2079 }
2080
2081 rtx
2082 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
2083                              rtx ptr ATTRIBUTE_UNUSED,
2084                              rtx bnd ATTRIBUTE_UNUSED)
2085 {
2086   gcc_unreachable ();
2087 }
2088
2089 void
2090 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
2091                               rtx addr ATTRIBUTE_UNUSED,
2092                               rtx bounds ATTRIBUTE_UNUSED,
2093                               rtx to ATTRIBUTE_UNUSED)
2094 {
2095   gcc_unreachable ();
2096 }
2097
2098 rtx
2099 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
2100 {
2101   gcc_unreachable ();
2102 }
2103
2104 void
2105 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
2106                                rtx bounds ATTRIBUTE_UNUSED)
2107 {
2108   gcc_unreachable ();
2109 }
2110
2111 /* Default version of canonicalize_comparison.  */
2112
2113 void
2114 default_canonicalize_comparison (int *, rtx *, rtx *, bool)
2115 {
2116 }
2117
2118 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV.  */
2119
2120 void
2121 default_atomic_assign_expand_fenv (tree *, tree *, tree *)
2122 {
2123 }
2124
2125 #ifndef PAD_VARARGS_DOWN
2126 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2127 #endif
2128
2129 /* Build an indirect-ref expression over the given TREE, which represents a
2130    piece of a va_arg() expansion.  */
2131 tree
2132 build_va_arg_indirect_ref (tree addr)
2133 {
2134   addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr);
2135   return addr;
2136 }
2137
2138 /* The "standard" implementation of va_arg: read the value from the
2139    current (padded) address and increment by the (padded) size.  */
2140
2141 tree
2142 std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
2143                           gimple_seq *post_p)
2144 {
2145   tree addr, t, type_size, rounded_size, valist_tmp;
2146   unsigned HOST_WIDE_INT align, boundary;
2147   bool indirect;
2148
2149   /* All of the alignment and movement below is for args-grow-up machines.
2150      As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2151      implement their own specialized gimplify_va_arg_expr routines.  */
2152   if (ARGS_GROW_DOWNWARD)
2153     gcc_unreachable ();
2154
2155   indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false);
2156   if (indirect)
2157     type = build_pointer_type (type);
2158
2159   if (targetm.calls.split_complex_arg
2160       && TREE_CODE (type) == COMPLEX_TYPE
2161       && targetm.calls.split_complex_arg (type))
2162     {
2163       tree real_part, imag_part;
2164
2165       real_part = std_gimplify_va_arg_expr (valist,
2166                                             TREE_TYPE (type), pre_p, NULL);
2167       real_part = get_initialized_tmp_var (real_part, pre_p, NULL);
2168
2169       imag_part = std_gimplify_va_arg_expr (unshare_expr (valist),
2170                                             TREE_TYPE (type), pre_p, NULL);
2171       imag_part = get_initialized_tmp_var (imag_part, pre_p, NULL);
2172
2173       return build2 (COMPLEX_EXPR, type, real_part, imag_part);
2174    }
2175
2176   align = PARM_BOUNDARY / BITS_PER_UNIT;
2177   boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
2178
2179   /* When we align parameter on stack for caller, if the parameter
2180      alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2181      aligned at MAX_SUPPORTED_STACK_ALIGNMENT.  We will match callee
2182      here with caller.  */
2183   if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
2184     boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
2185
2186   boundary /= BITS_PER_UNIT;
2187
2188   /* Hoist the valist value into a temporary for the moment.  */
2189   valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
2190
2191   /* va_list pointer is aligned to PARM_BOUNDARY.  If argument actually
2192      requires greater alignment, we must perform dynamic alignment.  */
2193   if (boundary > align
2194       && !TYPE_EMPTY_P (type)
2195       && !integer_zerop (TYPE_SIZE (type)))
2196     {
2197       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2198                   fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
2199       gimplify_and_add (t, pre_p);
2200
2201       t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2202                   fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
2203                                valist_tmp,
2204                                build_int_cst (TREE_TYPE (valist), -boundary)));
2205       gimplify_and_add (t, pre_p);
2206     }
2207   else
2208     boundary = align;
2209
2210   /* If the actual alignment is less than the alignment of the type,
2211      adjust the type accordingly so that we don't assume strict alignment
2212      when dereferencing the pointer.  */
2213   boundary *= BITS_PER_UNIT;
2214   if (boundary < TYPE_ALIGN (type))
2215     {
2216       type = build_variant_type_copy (type);
2217       SET_TYPE_ALIGN (type, boundary);
2218     }
2219
2220   /* Compute the rounded size of the type.  */
2221   type_size = arg_size_in_bytes (type);
2222   rounded_size = round_up (type_size, align);
2223
2224   /* Reduce rounded_size so it's sharable with the postqueue.  */
2225   gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
2226
2227   /* Get AP.  */
2228   addr = valist_tmp;
2229   if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
2230     {
2231       /* Small args are padded downward.  */
2232       t = fold_build2_loc (input_location, GT_EXPR, sizetype,
2233                        rounded_size, size_int (align));
2234       t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
2235                        size_binop (MINUS_EXPR, rounded_size, type_size));
2236       addr = fold_build_pointer_plus (addr, t);
2237     }
2238
2239   /* Compute new value for AP.  */
2240   t = fold_build_pointer_plus (valist_tmp, rounded_size);
2241   t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
2242   gimplify_and_add (t, pre_p);
2243
2244   addr = fold_convert (build_pointer_type (type), addr);
2245
2246   if (indirect)
2247     addr = build_va_arg_indirect_ref (addr);
2248
2249   return build_va_arg_indirect_ref (addr);
2250 }
2251
2252 void
2253 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
2254                                       machine_mode mode ATTRIBUTE_UNUSED,
2255                                       tree type ATTRIBUTE_UNUSED,
2256                                       int *pretend_arg_size ATTRIBUTE_UNUSED,
2257                                       int second_time ATTRIBUTE_UNUSED)
2258 {
2259 }
2260
2261 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2262    not support nested low-overhead loops.  */
2263
2264 bool
2265 can_use_doloop_if_innermost (const widest_int &, const widest_int &,
2266                              unsigned int loop_depth, bool)
2267 {
2268   return loop_depth == 1;
2269 }
2270
2271 /* Default implementation of TARGET_OPTAB_SUPPORTED_P.  */
2272
2273 bool
2274 default_optab_supported_p (int, machine_mode, machine_mode, optimization_type)
2275 {
2276   return true;
2277 }
2278
2279 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST.  */
2280
2281 unsigned int
2282 default_max_noce_ifcvt_seq_cost (edge e)
2283 {
2284   bool predictable_p = predictable_edge_p (e);
2285
2286   enum compiler_param param
2287     = (predictable_p
2288        ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2289        : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST);
2290
2291   /* If we have a parameter set, use that, otherwise take a guess using
2292      BRANCH_COST.  */
2293   if (global_options_set.x_param_values[param])
2294     return PARAM_VALUE (param);
2295   else
2296     return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (3);
2297 }
2298
2299 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION.  */
2300
2301 unsigned int
2302 default_min_arithmetic_precision (void)
2303 {
2304   return WORD_REGISTER_OPERATIONS ? BITS_PER_WORD : BITS_PER_UNIT;
2305 }
2306
2307 /* Default implementation of TARGET_C_EXCESS_PRECISION.  */
2308
2309 enum flt_eval_method
2310 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED)
2311 {
2312   return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
2313 }
2314
2315 /* Default implementation for
2316   TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE.  */
2317 HOST_WIDE_INT
2318 default_stack_clash_protection_alloca_probe_range (void)
2319 {
2320   return 0;
2321 }
2322
2323 /* The default implementation of TARGET_EARLY_REMAT_MODES.  */
2324
2325 void
2326 default_select_early_remat_modes (sbitmap)
2327 {
2328 }
2329
2330 /* The default implementation of TARGET_PREFERRED_ELSE_VALUE.  */
2331
2332 tree
2333 default_preferred_else_value (unsigned, tree type, unsigned, tree *)
2334 {
2335   return build_zero_cst (type);
2336 }
2337
2338 /* Default implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE.  */
2339 bool
2340 default_have_speculation_safe_value (bool active ATTRIBUTE_UNUSED)
2341 {
2342 #ifdef HAVE_speculation_barrier
2343   return active ? HAVE_speculation_barrier : true;
2344 #else
2345   return false;
2346 #endif
2347 }
2348 /* Alternative implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE
2349    that can be used on targets that never have speculative execution.  */
2350 bool
2351 speculation_safe_value_not_needed (bool active)
2352 {
2353   return !active;
2354 }
2355
2356 /* Default implementation of the speculation-safe-load builtin.  This
2357    implementation simply copies val to result and generates a
2358    speculation_barrier insn, if such a pattern is defined.  */
2359 rtx
2360 default_speculation_safe_value (machine_mode mode ATTRIBUTE_UNUSED,
2361                                 rtx result, rtx val,
2362                                 rtx failval ATTRIBUTE_UNUSED)
2363 {
2364   emit_move_insn (result, val);
2365
2366 #ifdef HAVE_speculation_barrier
2367   /* Assume the target knows what it is doing: if it defines a
2368      speculation barrier, but it is not enabled, then assume that one
2369      isn't needed.  */
2370   if (HAVE_speculation_barrier)
2371     emit_insn (gen_speculation_barrier ());
2372 #endif
2373
2374   return result;
2375 }
2376
2377 #include "gt-targhooks.h"