gcc/params.def

   1 /* params.def - Run-time parameters.
   2    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   3    Written by Mark Mitchell <mark@codesourcery.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* This file contains definitions for language-independent
  22    parameters.  The DEFPARAM macro takes 6 arguments:
  23
  24      - The enumeral corresponding to this parameter.
  25
  26      - The name that can be used to set this parameter using the
  27        command-line option `--param <name>=<value>'.
  28
  29      - A help string explaining how the parameter is used.
  30
  31      - A default value for the parameter.
  32
  33      - The minimum acceptable value for the parameter.
  34
  35      - The maximum acceptable value for the parameter (if greater than
  36      the minimum).
  37
  38    Be sure to add an entry to invoke.texi summarizing the parameter.  */
  39
  40 /* When branch is predicted to be taken with probability lower than this
  41    threshold (in percent), then it is considered well predictable. */
  42 DEFPARAM (PARAM_PREDICTABLE_BRANCH_OUTCOME,
  43           "predictable-branch-outcome",
  44           "Maximal estimated outcome of branch considered predictable",
  45           2, 0, 50)
  46
  47 DEFPARAM (PARAM_INLINE_MIN_SPEEDUP,
  48           "inline-min-speedup",
  49           "The minimal estimated speedup allowing inliner to ignore inline-insns-single and inline-isnsns-auto",
  50           10, 0, 0)
  51
  52 /* The single function inlining limit. This is the maximum size
  53    of a function counted in internal gcc instructions (not in
  54    real machine instructions) that is eligible for inlining
  55    by the tree inliner.
  56    The default value is 450.
  57    Only functions marked inline (or methods defined in the class
  58    definition for C++) are affected by this.
  59    There are more restrictions to inlining: If inlined functions
  60    call other functions, the already inlined instructions are
  61    counted and once the recursive inline limit (see
  62    "max-inline-insns" parameter) is exceeded, the acceptable size
  63    gets decreased.  */
  64 DEFPARAM (PARAM_MAX_INLINE_INSNS_SINGLE,
  65           "max-inline-insns-single",
  66           "The maximum number of instructions in a single function eligible for inlining",
  67           400, 0, 0)
  68
  69 /* The single function inlining limit for functions that are
  70    inlined by virtue of -finline-functions (-O3).
  71    This limit should be chosen to be below or equal to the limit
  72    that is applied to functions marked inlined (or defined in the
  73    class declaration in C++) given by the "max-inline-insns-single"
  74    parameter.
  75    The default value is 40.  */
  76 DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO,
  77           "max-inline-insns-auto",
  78           "The maximum number of instructions when automatically inlining",
  79           40, 0, 0)
  80
  81 DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE,
  82           "max-inline-insns-recursive",
  83           "The maximum number of instructions inline function can grow to via recursive inlining",
  84           450, 0, 0)
  85
  86 DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO,
  87           "max-inline-insns-recursive-auto",
  88           "The maximum number of instructions non-inline function can grow to via recursive inlining",
  89           450, 0, 0)
  90
  91 DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH,
  92           "max-inline-recursive-depth",
  93           "The maximum depth of recursive inlining for inline functions",
  94           8, 0, 0)
  95
  96 DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO,
  97           "max-inline-recursive-depth-auto",
  98           "The maximum depth of recursive inlining for non-inline functions",
  99           8, 0, 0)
 100
 101 DEFPARAM (PARAM_MIN_INLINE_RECURSIVE_PROBABILITY,
 102           "min-inline-recursive-probability",
 103           "Inline recursively only when the probability of call being executed exceeds the parameter",
 104           10, 0, 0)
 105
 106 /* Limit of iterations of early inliner.  This basically bounds number of
 107    nested indirect calls early inliner can resolve.  Deeper chains are still
 108    handled by late inlining.  */
 109 DEFPARAM (PARAM_EARLY_INLINER_MAX_ITERATIONS,
 110           "max-early-inliner-iterations",
 111           "The maximum number of nested indirect inlining performed by early inliner",
 112           1, 0, 0)
 113
 114 /* Limit on probability of entry BB.  */
 115 DEFPARAM (PARAM_COMDAT_SHARING_PROBABILITY,
 116           "comdat-sharing-probability",
 117           "Probability that COMDAT function will be shared with different compilation unit",
 118           20, 0, 0)
 119
 120 /* Limit on probability of entry BB.  */
 121 DEFPARAM (PARAM_PARTIAL_INLINING_ENTRY_PROBABILITY,
 122           "partial-inlining-entry-probability",
 123           "Maximum probability of the entry BB of split region (in percent relative to entry BB of the function) to make partial inlining happen",
 124           70, 0, 0)
 125
 126 /* Limit the number of expansions created by the variable expansion
 127    optimization to avoid register pressure.  */
 128 DEFPARAM (PARAM_MAX_VARIABLE_EXPANSIONS,
 129           "max-variable-expansions-in-unroller",
 130           "If -fvariable-expansion-in-unroller is used, the maximum number of times that an individual variable will be expanded during loop unrolling",
 131           1, 0, 0)
 132
 133 /* Limit loop autovectorization to loops with large enough iteration count.  */
 134 DEFPARAM (PARAM_MIN_VECT_LOOP_BOUND,
 135           "min-vect-loop-bound",
 136           "If -ftree-vectorize is used, the minimal loop bound of a loop to be considered for vectorization",
 137           1, 1, 0)
 138
 139 /* The maximum number of instructions to consider when looking for an
 140    instruction to fill a delay slot.  If more than this arbitrary
 141    number of instructions is searched, the time savings from filling
 142    the delay slot will be minimal so stop searching.  Increasing
 143    values mean more aggressive optimization, making the compile time
 144    increase with probably small improvement in executable run time.  */
 145 DEFPARAM (PARAM_MAX_DELAY_SLOT_INSN_SEARCH,
 146           "max-delay-slot-insn-search",
 147           "The maximum number of instructions to consider to fill a delay slot",
 148           100, 0, 0)
 149
 150 /* When trying to fill delay slots, the maximum number of instructions
 151    to consider when searching for a block with valid live register
 152    information.  Increasing this arbitrarily chosen value means more
 153    aggressive optimization, increasing the compile time.  This
 154    parameter should be removed when the delay slot code is rewritten
 155    to maintain the control-flow graph.  */
 156 DEFPARAM(PARAM_MAX_DELAY_SLOT_LIVE_SEARCH,
 157          "max-delay-slot-live-search",
 158          "The maximum number of instructions to consider to find accurate live register information",
 159          333, 0, 0)
 160
 161 /* This parameter limits the number of branch elements that the
 162    scheduler will track anti-dependencies through without resetting
 163    the tracking mechanism.  Large functions with few calls or barriers
 164    can generate lists containing many 1000's of dependencies.  Generally
 165    the compiler either uses all available memory, or runs for far too long.  */
 166 DEFPARAM(PARAM_MAX_PENDING_LIST_LENGTH,
 167          "max-pending-list-length",
 168          "The maximum length of scheduling's pending operations list",
 169          32, 0, 0)
 170
 171 /* This parameter limits the number of backtracking attempts when using the
 172    haifa scheduler for modulo scheduling.  */
 173 DEFPARAM(PARAM_MAX_MODULO_BACKTRACK_ATTEMPTS,
 174          "max-modulo-backtrack-attempts",
 175          "The maximum number of backtrack attempts the scheduler should make when modulo scheduling a loop",
 176          40, 0, 0)
 177
 178 DEFPARAM(PARAM_LARGE_FUNCTION_INSNS,
 179          "large-function-insns",
 180          "The size of function body to be considered large",
 181          2700, 0, 0)
 182 DEFPARAM(PARAM_LARGE_FUNCTION_GROWTH,
 183          "large-function-growth",
 184          "Maximal growth due to inlining of large function (in percent)",
 185          100, 0, 0)
 186 DEFPARAM(PARAM_LARGE_UNIT_INSNS,
 187          "large-unit-insns",
 188          "The size of translation unit to be considered large",
 189          10000, 0, 0)
 190 DEFPARAM(PARAM_INLINE_UNIT_GROWTH,
 191          "inline-unit-growth",
 192          "How much can given compilation unit grow because of the inlining (in percent)",
 193          30, 0, 0)
 194 DEFPARAM(PARAM_IPCP_UNIT_GROWTH,
 195          "ipcp-unit-growth",
 196          "How much can given compilation unit grow because of the interprocedural constant propagation (in percent)",
 197          10, 0, 0)
 198 DEFPARAM(PARAM_EARLY_INLINING_INSNS,
 199          "early-inlining-insns",
 200          "Maximal estimated growth of function body caused by early inlining of single call",
 201          11, 0, 0)
 202 DEFPARAM(PARAM_LARGE_STACK_FRAME,
 203          "large-stack-frame",
 204          "The size of stack frame to be considered large",
 205          256, 0, 0)
 206 DEFPARAM(PARAM_STACK_FRAME_GROWTH,
 207          "large-stack-frame-growth",
 208          "Maximal stack frame growth due to inlining (in percent)",
 209          1000, 0, 0)
 210
 211 /* The GCSE optimization will be disabled if it would require
 212    significantly more memory than this value.  */
 213 DEFPARAM(PARAM_MAX_GCSE_MEMORY,
 214          "max-gcse-memory",
 215          "The maximum amount of memory to be allocated by GCSE",
 216          50 * 1024 * 1024, 0, 0)
 217
 218 /* The GCSE optimization of an expression will avoided if the ratio of
 219    insertions to deletions is greater than this value.  */
 220 DEFPARAM(PARAM_MAX_GCSE_INSERTION_RATIO,
 221          "max-gcse-insertion-ratio",
 222          "The maximum ratio of insertions to deletions of expressions in GCSE",
 223          20, 0, 0)
 224
 225 /* This is the threshold ratio when to perform partial redundancy
 226    elimination after reload. We perform partial redundancy elimination
 227    when the following holds:
 228    (Redundant load execution count)
 229    ------------------------------- >= GCSE_AFTER_RELOAD_PARTIAL_FRACTION
 230    (Added loads execution count)                                          */
 231 DEFPARAM(PARAM_GCSE_AFTER_RELOAD_PARTIAL_FRACTION,
 232         "gcse-after-reload-partial-fraction",
 233         "The threshold ratio for performing partial redundancy elimination after reload",
 234         3, 0, 0)
 235 /* This is the threshold ratio of the critical edges execution count compared to
 236    the redundant loads execution count that permits performing the load
 237    redundancy elimination in gcse after reload.  */
 238 DEFPARAM(PARAM_GCSE_AFTER_RELOAD_CRITICAL_FRACTION,
 239         "gcse-after-reload-critical-fraction",
 240         "The threshold ratio of critical edges execution count that permit performing redundancy elimination after reload",
 241         10, 0, 0)
 242
 243 /* GCSE will use GCSE_COST_DISTANCE_RATION as a scaling factor
 244    to calculate maximum distance for which an expression is allowed to move
 245    from its rtx_cost.  */
 246 DEFPARAM(PARAM_GCSE_COST_DISTANCE_RATIO,
 247          "gcse-cost-distance-ratio",
 248          "Scaling factor in calculation of maximum distance an expression can be moved by GCSE optimizations",
 249          10, 0, 0)
 250 /* GCSE won't restrict distance for which an expression with rtx_cost greater
 251    than COSTS_N_INSN(GCSE_UNRESTRICTED_COST) is allowed to move.  */
 252 DEFPARAM(PARAM_GCSE_UNRESTRICTED_COST,
 253          "gcse-unrestricted-cost",
 254          "Cost at which GCSE optimizations will not constraint the distance an expression can travel",
 255          3, 0, 0)
 256
 257 /* How deep from a given basic block the dominator tree should be searched
 258    for expressions to hoist to the block.  The value of 0 will avoid limiting
 259    the search.  */
 260 DEFPARAM(PARAM_MAX_HOIST_DEPTH,
 261          "max-hoist-depth",
 262          "Maximum depth of search in the dominator tree for expressions to hoist",
 263          30, 0, 0)
 264
 265 /* This parameter limits the number of insns in a loop that will be unrolled,
 266    and by how much the loop is unrolled.
 267
 268    This limit should be at most half of the peeling limits:  loop unroller
 269    decides to not unroll loops that iterate fewer than 2*number of allowed
 270    unrollings and thus we would have loops that are neither peeled or unrolled
 271    otherwise.  */
 272 DEFPARAM(PARAM_MAX_UNROLLED_INSNS,
 273          "max-unrolled-insns",
 274          "The maximum number of instructions to consider to unroll in a loop",
 275          200, 0, 0)
 276 /* This parameter limits how many times the loop is unrolled depending
 277    on number of insns really executed in each iteration.  */
 278 DEFPARAM(PARAM_MAX_AVERAGE_UNROLLED_INSNS,
 279          "max-average-unrolled-insns",
 280          "The maximum number of instructions to consider to unroll in a loop on average",
 281          80, 0, 0)
 282 /* The maximum number of unrollings of a single loop.  */
 283 DEFPARAM(PARAM_MAX_UNROLL_TIMES,
 284         "max-unroll-times",
 285         "The maximum number of unrollings of a single loop",
 286         8, 0, 0)
 287 /* The maximum number of insns of a peeled loop.  */
 288 DEFPARAM(PARAM_MAX_PEELED_INSNS,
 289         "max-peeled-insns",
 290         "The maximum number of insns of a peeled loop",
 291         100, 0, 0)
 292 /* The maximum number of peelings of a single loop.  */
 293 DEFPARAM(PARAM_MAX_PEEL_TIMES,
 294         "max-peel-times",
 295         "The maximum number of peelings of a single loop",
 296         16, 0, 0)
 297 /* The maximum number of peelings of a single loop that is peeled completely.  */
 298 DEFPARAM(PARAM_MAX_PEEL_BRANCHES,
 299         "max-peel-branches",
 300         "The maximum number of branches on the path through the peeled sequence",
 301         32, 0, 0)
 302 /* The maximum number of insns of a peeled loop.  */
 303 DEFPARAM(PARAM_MAX_COMPLETELY_PEELED_INSNS,
 304         "max-completely-peeled-insns",
 305         "The maximum number of insns of a completely peeled loop",
 306         200, 0, 0)
 307 /* The maximum number of peelings of a single loop that is peeled completely.  */
 308 DEFPARAM(PARAM_MAX_COMPLETELY_PEEL_TIMES,
 309         "max-completely-peel-times",
 310         "The maximum number of peelings of a single loop that is peeled completely",
 311         16, 0, 0)
 312 /* The maximum number of insns of a peeled loop that rolls only once.  */
 313 DEFPARAM(PARAM_MAX_ONCE_PEELED_INSNS,
 314         "max-once-peeled-insns",
 315         "The maximum number of insns of a peeled loop that rolls only once",
 316         400, 0, 0)
 317 /* The maximum depth of a loop nest we completely peel.  */
 318 DEFPARAM(PARAM_MAX_UNROLL_ITERATIONS,
 319          "max-completely-peel-loop-nest-depth",
 320          "The maximum depth of a loop nest we completely peel",
 321          8, 0, 0)
 322
 323 /* The maximum number of insns of an unswitched loop.  */
 324 DEFPARAM(PARAM_MAX_UNSWITCH_INSNS,
 325         "max-unswitch-insns",
 326         "The maximum number of insns of an unswitched loop",
 327         50, 0, 0)
 328 /* The maximum level of recursion in unswitch_single_loop.  */
 329 DEFPARAM(PARAM_MAX_UNSWITCH_LEVEL,
 330         "max-unswitch-level",
 331         "The maximum number of unswitchings in a single loop",
 332         3, 0, 0)
 333
 334 /* The maximum number of iterations of a loop the brute force algorithm
 335    for analysis of # of iterations of the loop tries to evaluate.  */
 336 DEFPARAM(PARAM_MAX_ITERATIONS_TO_TRACK,
 337         "max-iterations-to-track",
 338         "Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates",
 339         1000, 0, 0)
 340 /* A cutoff to avoid costly computations of the number of iterations in
 341    the doloop transformation.  */
 342 DEFPARAM(PARAM_MAX_ITERATIONS_COMPUTATION_COST,
 343         "max-iterations-computation-cost",
 344         "Bound on the cost of an expression to compute the number of iterations",
 345         10, 0, 0)
 346
 347 /* This parameter is used to tune SMS MAX II calculations.  */
 348 DEFPARAM(PARAM_SMS_MAX_II_FACTOR,
 349          "sms-max-ii-factor",
 350          "A factor for tuning the upper bound that swing modulo scheduler uses for scheduling a loop",
 351          100, 0, 0)
 352 /* The minimum value of stage count that swing modulo scheduler will generate.  */
 353 DEFPARAM(PARAM_SMS_MIN_SC,
 354         "sms-min-sc",
 355         "The minimum value of stage count that swing modulo scheduler will generate.",
 356         2, 1, 1)
 357 DEFPARAM(PARAM_SMS_DFA_HISTORY,
 358          "sms-dfa-history",
 359          "The number of cycles the swing modulo scheduler considers when checking conflicts using DFA",
 360          0, 0, 0)
 361 DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD,
 362          "sms-loop-average-count-threshold",
 363          "A threshold on the average loop count considered by the swing modulo scheduler",
 364          0, 0, 0)
 365
 366 DEFPARAM(HOT_BB_COUNT_WS_PERMILLE,
 367          "hot-bb-count-ws-permille",
 368          "A basic block profile count is considered hot if it contributes to "
 369          "the given permillage of the entire profiled execution",
 370          999, 0, 1000)
 371 DEFPARAM(HOT_BB_FREQUENCY_FRACTION,
 372          "hot-bb-frequency-fraction",
 373          "Select fraction of the maximal frequency of executions of basic block in function given basic block needs to have to be considered hot",
 374          1000, 0, 0)
 375
 376 DEFPARAM(UNLIKELY_BB_COUNT_FRACTION,
 377          "unlikely-bb-count-fraction",
 378          "The minimum fraction of profile runs a given basic block execution count must be not to be considered unlikely",
 379          20, 1, 10000)
 380
 381 DEFPARAM (PARAM_ALIGN_THRESHOLD,
 382           "align-threshold",
 383           "Select fraction of the maximal frequency of executions of basic block in function given basic block get alignment",
 384           100, 1, 0)
 385
 386 DEFPARAM (PARAM_ALIGN_LOOP_ITERATIONS,
 387           "align-loop-iterations",
 388           "Loops iterating at least selected number of iterations will get loop alignement.",
 389           4, 0, 0)
 390
 391 /* For guessed profiles, the loops having unknown number of iterations
 392    are predicted to iterate relatively few (10) times at average.
 393    For functions containing one loop with large known number of iterations
 394    and other loops having unbounded loops we would end up predicting all
 395    the other loops cold that is not usually the case.  So we need to artificially
 396    flatten the profile.
 397
 398    We need to cut the maximal predicted iterations to large enough iterations
 399    so the loop appears important, but safely within maximum hotness
 400    range.  */
 401
 402 DEFPARAM(PARAM_MAX_PREDICTED_ITERATIONS,
 403          "max-predicted-iterations",
 404          "The maximum number of loop iterations we predict statically",
 405          100, 0, 0)
 406
 407 /* This parameter controls the probability of builtin_expect. The default
 408    value is 90%. This empirical value is obtained through the weighted
 409    probability of FDO counters (with the FDO count value as the weight)
 410    in some real world programs:
 411    (1) Google performance test benchmarks: the probability is 0.9081.
 412    (2) Linux 3.3 kernel running Google search workload: the probability
 413    is 0.8717.  */
 414
 415 DEFPARAM(BUILTIN_EXPECT_PROBABILITY,
 416          "builtin-expect-probability",
 417          "Set the estimated probability in percentage for builtin expect. The default value is 90% probability.",
 418          90, 0, 100)
 419 DEFPARAM(TRACER_DYNAMIC_COVERAGE_FEEDBACK,
 420          "tracer-dynamic-coverage-feedback",
 421          "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is available",
 422          95, 0, 100)
 423 DEFPARAM(TRACER_DYNAMIC_COVERAGE,
 424          "tracer-dynamic-coverage",
 425          "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is not available",
 426          75, 0, 100)
 427 DEFPARAM(TRACER_MAX_CODE_GROWTH,
 428          "tracer-max-code-growth",
 429          "Maximal code growth caused by tail duplication (in percent)",
 430          100, 0, 0)
 431 DEFPARAM(TRACER_MIN_BRANCH_RATIO,
 432          "tracer-min-branch-ratio",
 433          "Stop reverse growth if the reverse probability of best edge is less than this threshold (in percent)",
 434          10, 0, 100)
 435 DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY_FEEDBACK,
 436          "tracer-min-branch-probability-feedback",
 437          "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is available",
 438          80, 0, 100)
 439 DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY,
 440          "tracer-min-branch-probability",
 441          "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is not available",
 442          50, 0, 100)
 443
 444 /* The maximum number of incoming edges to consider for crossjumping.  */
 445 DEFPARAM(PARAM_MAX_CROSSJUMP_EDGES,
 446          "max-crossjump-edges",
 447          "The maximum number of incoming edges to consider for crossjumping",
 448          100, 0, 0)
 449
 450 /* The minimum number of matching instructions to consider for crossjumping.  */
 451 DEFPARAM(PARAM_MIN_CROSSJUMP_INSNS,
 452      "min-crossjump-insns",
 453      "The minimum number of matching instructions to consider for crossjumping",
 454      5, 1, 0)
 455
 456 /* The maximum number expansion factor when copying basic blocks.  */
 457 DEFPARAM(PARAM_MAX_GROW_COPY_BB_INSNS,
 458      "max-grow-copy-bb-insns",
 459      "The maximum expansion factor when copying basic blocks",
 460      8, 0, 0)
 461
 462 /* The maximum number of insns to duplicate when unfactoring computed gotos.  */
 463 DEFPARAM(PARAM_MAX_GOTO_DUPLICATION_INSNS,
 464      "max-goto-duplication-insns",
 465      "The maximum number of insns to duplicate when unfactoring computed gotos",
 466      8, 0, 0)
 467
 468 /* The maximum length of path considered in cse.  */
 469 DEFPARAM(PARAM_MAX_CSE_PATH_LENGTH,
 470          "max-cse-path-length",
 471          "The maximum length of path considered in cse",
 472          10, 1, 0)
 473 DEFPARAM(PARAM_MAX_CSE_INSNS,
 474          "max-cse-insns",
 475          "The maximum instructions CSE process before flushing",
 476          1000, 0, 0)
 477
 478 /* The cost of expression in loop invariant motion that is considered
 479    expensive.  */
 480 DEFPARAM(PARAM_LIM_EXPENSIVE,
 481          "lim-expensive",
 482          "The minimum cost of an expensive expression in the loop invariant motion",
 483          20, 0, 0)
 484
 485 /* Bound on number of candidates for induction variables below that
 486    all candidates are considered for each use in induction variable
 487    optimizations.  */
 488
 489 DEFPARAM(PARAM_IV_CONSIDER_ALL_CANDIDATES_BOUND,
 490          "iv-consider-all-candidates-bound",
 491          "Bound on number of candidates below that all candidates are considered in iv optimizations",
 492          30, 0, 0)
 493
 494 /* The induction variable optimizations give up on loops that contain more
 495    induction variable uses.  */
 496
 497 DEFPARAM(PARAM_IV_MAX_CONSIDERED_USES,
 498          "iv-max-considered-uses",
 499          "Bound on number of iv uses in loop optimized in iv optimizations",
 500          250, 0, 0)
 501
 502 /* If there are at most this number of ivs in the set, try removing unnecessary
 503    ivs from the set always.  */
 504
 505 DEFPARAM(PARAM_IV_ALWAYS_PRUNE_CAND_SET_BOUND,
 506          "iv-always-prune-cand-set-bound",
 507          "If number of candidates in the set is smaller, we always try to remove unused ivs during its optimization",
 508          10, 0, 0)
 509
 510 DEFPARAM(PARAM_SCEV_MAX_EXPR_SIZE,
 511          "scev-max-expr-size",
 512          "Bound on size of expressions used in the scalar evolutions analyzer",
 513          100, 0, 0)
 514
 515 DEFPARAM(PARAM_SCEV_MAX_EXPR_COMPLEXITY,
 516          "scev-max-expr-complexity",
 517          "Bound on the complexity of the expressions in the scalar evolutions analyzer",
 518          10, 0, 0)
 519
 520 DEFPARAM(PARAM_OMEGA_MAX_VARS,
 521          "omega-max-vars",
 522          "Bound on the number of variables in Omega constraint systems",
 523          128, 0, 0)
 524
 525 DEFPARAM(PARAM_OMEGA_MAX_GEQS,
 526          "omega-max-geqs",
 527          "Bound on the number of inequalities in Omega constraint systems",
 528          256, 0, 0)
 529
 530 DEFPARAM(PARAM_OMEGA_MAX_EQS,
 531          "omega-max-eqs",
 532          "Bound on the number of equalities in Omega constraint systems",
 533          128, 0, 0)
 534
 535 DEFPARAM(PARAM_OMEGA_MAX_WILD_CARDS,
 536          "omega-max-wild-cards",
 537          "Bound on the number of wild cards in Omega constraint systems",
 538          18, 0, 0)
 539
 540 DEFPARAM(PARAM_OMEGA_HASH_TABLE_SIZE,
 541          "omega-hash-table-size",
 542          "Bound on the size of the hash table in Omega constraint systems",
 543          550, 0, 0)
 544
 545 DEFPARAM(PARAM_OMEGA_MAX_KEYS,
 546          "omega-max-keys",
 547          "Bound on the number of keys in Omega constraint systems",
 548          500, 0, 0)
 549
 550 DEFPARAM(PARAM_OMEGA_ELIMINATE_REDUNDANT_CONSTRAINTS,
 551          "omega-eliminate-redundant-constraints",
 552          "When set to 1, use expensive methods to eliminate all redundant constraints",
 553          0, 0, 1)
 554
 555 DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS,
 556          "vect-max-version-for-alignment-checks",
 557          "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alignment check",
 558          6, 0, 0)
 559
 560 DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS,
 561          "vect-max-version-for-alias-checks",
 562          "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alias check",
 563          10, 0, 0)
 564
 565 DEFPARAM(PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT,
 566          "vect-max-peeling-for-alignment",
 567          "Max number of loop peels to enhancement alignment of data references in a loop",
 568          -1, -1, 64)
 569
 570 DEFPARAM(PARAM_MAX_CSELIB_MEMORY_LOCATIONS,
 571          "max-cselib-memory-locations",
 572          "The maximum memory locations recorded by cselib",
 573          500, 0, 0)
 574
 575 #ifdef ENABLE_GC_ALWAYS_COLLECT
 576 # define GGC_MIN_EXPAND_DEFAULT 0
 577 # define GGC_MIN_HEAPSIZE_DEFAULT 0
 578 #else
 579 # define GGC_MIN_EXPAND_DEFAULT 30
 580 # define GGC_MIN_HEAPSIZE_DEFAULT 4096
 581 #endif
 582
 583 DEFPARAM(GGC_MIN_EXPAND,
 584          "ggc-min-expand",
 585          "Minimum heap expansion to trigger garbage collection, as a percentage of the total size of the heap",
 586          GGC_MIN_EXPAND_DEFAULT, 0, 0)
 587
 588 DEFPARAM(GGC_MIN_HEAPSIZE,
 589          "ggc-min-heapsize",
 590          "Minimum heap size before we start collecting garbage, in kilobytes",
 591          GGC_MIN_HEAPSIZE_DEFAULT, 0, 0)
 592
 593 #undef GGC_MIN_EXPAND_DEFAULT
 594 #undef GGC_MIN_HEAPSIZE_DEFAULT
 595
 596 DEFPARAM(PARAM_MAX_RELOAD_SEARCH_INSNS,
 597          "max-reload-search-insns",
 598          "The maximum number of instructions to search backward when looking for equivalent reload",
 599          100, 0, 0)
 600
 601 DEFPARAM(PARAM_SINK_FREQUENCY_THRESHOLD,
 602          "sink-frequency-threshold",
 603          "Target block's relative execution frequency (as a percentage) required to sink a statement",
 604          75, 0, 100)
 605
 606 DEFPARAM(PARAM_MAX_SCHED_REGION_BLOCKS,
 607          "max-sched-region-blocks",
 608          "The maximum number of blocks in a region to be considered for interblock scheduling",
 609          10, 0, 0)
 610
 611 DEFPARAM(PARAM_MAX_SCHED_REGION_INSNS,
 612          "max-sched-region-insns",
 613          "The maximum number of insns in a region to be considered for interblock scheduling",
 614          100, 0, 0)
 615
 616 DEFPARAM(PARAM_MAX_PIPELINE_REGION_BLOCKS,
 617          "max-pipeline-region-blocks",
 618          "The maximum number of blocks in a region to be considered for interblock scheduling",
 619          15, 0, 0)
 620
 621 DEFPARAM(PARAM_MAX_PIPELINE_REGION_INSNS,
 622          "max-pipeline-region-insns",
 623          "The maximum number of insns in a region to be considered for interblock scheduling",
 624          200, 0, 0)
 625
 626 DEFPARAM(PARAM_MIN_SPEC_PROB,
 627          "min-spec-prob",
 628          "The minimum probability of reaching a source block for interblock speculative scheduling",
 629          40, 0, 0)
 630
 631 DEFPARAM(PARAM_MAX_SCHED_EXTEND_REGIONS_ITERS,
 632          "max-sched-extend-regions-iters",
 633          "The maximum number of iterations through CFG to extend regions",
 634          0, 0, 0)
 635
 636 DEFPARAM(PARAM_MAX_SCHED_INSN_CONFLICT_DELAY,
 637          "max-sched-insn-conflict-delay",
 638          "The maximum conflict delay for an insn to be considered for speculative motion",
 639          3, 1, 10)
 640
 641 DEFPARAM(PARAM_SCHED_SPEC_PROB_CUTOFF,
 642          "sched-spec-prob-cutoff",
 643          "The minimal probability of speculation success (in percents), so that speculative insn will be scheduled.",
 644          40, 0, 100)
 645
 646 DEFPARAM(PARAM_SCHED_STATE_EDGE_PROB_CUTOFF,
 647          "sched-state-edge-prob-cutoff",
 648          "The minimum probability an edge must have for the scheduler to save its state across it.",
 649          10, 0, 100)
 650
 651 DEFPARAM(PARAM_SELSCHED_MAX_LOOKAHEAD,
 652          "selsched-max-lookahead",
 653          "The maximum size of the lookahead window of selective scheduling",
 654          50, 0, 0)
 655
 656 DEFPARAM(PARAM_SELSCHED_MAX_SCHED_TIMES,
 657          "selsched-max-sched-times",
 658          "Maximum number of times that an insn could be scheduled",
 659          2, 0, 0)
 660
 661 DEFPARAM(PARAM_SELSCHED_INSNS_TO_RENAME,
 662          "selsched-insns-to-rename",
 663          "Maximum number of instructions in the ready list that are considered eligible for renaming",
 664          2, 0, 0)
 665
 666 DEFPARAM (PARAM_SCHED_MEM_TRUE_DEP_COST,
 667           "sched-mem-true-dep-cost",
 668           "Minimal distance between possibly conflicting store and load",
 669           1, 0, 0)
 670
 671 DEFPARAM(PARAM_MAX_LAST_VALUE_RTL,
 672          "max-last-value-rtl",
 673          "The maximum number of RTL nodes that can be recorded as combiner's last value",
 674          10000, 0, 0)
 675
 676 DEFPARAM(PARAM_MAX_COMBINE_INSNS,
 677          "max-combine-insns",
 678          "The maximum number of insns combine tries to combine",
 679          4, 2, 4)
 680
 681 /* INTEGER_CST nodes are shared for values [{-1,0} .. N) for
 682    {signed,unsigned} integral types.  This determines N.
 683    Experimentation shows 251 to be a good value that generates the
 684    least amount of garbage for allocating the TREE_VEC storage.  */
 685 DEFPARAM (PARAM_INTEGER_SHARE_LIMIT,
 686           "integer-share-limit",
 687           "The upper bound for sharing integer constants",
 688           251, 2, 2)
 689
 690 DEFPARAM (PARAM_SSP_BUFFER_SIZE,
 691           "ssp-buffer-size",
 692           "The lower bound for a buffer to be considered for stack smashing protection",
 693           8, 1, 0)
 694
 695 DEFPARAM (PARAM_MIN_SIZE_FOR_STACK_SHARING,
 696           "min-size-for-stack-sharing",
 697           "The minimum size of variables taking part in stack slot sharing "
 698           "when not optimizing",
 699           32, 0, 0)
 700
 701 /* When we thread through a block we have to make copies of the
 702    statements within the block.  Clearly for large blocks the code
 703    duplication is bad.
 704
 705    PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS specifies the maximum number
 706    of statements and PHI nodes allowed in a block which is going to
 707    be duplicated for thread jumping purposes.
 708
 709    Some simple analysis showed that more than 99% of the jump
 710    threading opportunities are for blocks with less than 15
 711    statements.  So we can get the benefits of jump threading
 712    without excessive code bloat for pathological cases with the
 713    throttle set at 15 statements.  */
 714 DEFPARAM (PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS,
 715           "max-jump-thread-duplication-stmts",
 716           "Maximum number of statements allowed in a block that needs to be duplicated when threading jumps",
 717           15, 0, 0)
 718
 719 /* This is the maximum number of fields a variable may have before the pointer analysis machinery
 720    will stop trying to treat it in a field-sensitive manner.
 721    There are programs out there with thousands of fields per structure, and handling them
 722    field-sensitively is not worth the cost.  */
 723 DEFPARAM (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
 724           "max-fields-for-field-sensitive",
 725           "Maximum number of fields in a structure before pointer analysis treats the structure as a single variable",
 726           0, 0, 0)
 727
 728 DEFPARAM(PARAM_MAX_SCHED_READY_INSNS,
 729          "max-sched-ready-insns",
 730          "The maximum number of instructions ready to be issued to be considered by the scheduler during the first scheduling pass",
 731          100, 0, 0)
 732
 733 /* This is the maximum number of active local stores RTL DSE will consider.  */
 734 DEFPARAM (PARAM_MAX_DSE_ACTIVE_LOCAL_STORES,
 735           "max-dse-active-local-stores",
 736           "Maximum number of active local stores in RTL dead store elimination",
 737           5000, 0, 0)
 738
 739 /* Prefetching and cache-optimizations related parameters.  Default values are
 740    usually set by machine description.  */
 741
 742 /* The number of insns executed before prefetch is completed.  */
 743
 744 DEFPARAM (PARAM_PREFETCH_LATENCY,
 745          "prefetch-latency",
 746          "The number of insns executed before prefetch is completed",
 747          200, 0, 0)
 748
 749 /* The number of prefetches that can run at the same time.  */
 750
 751 DEFPARAM (PARAM_SIMULTANEOUS_PREFETCHES,
 752           "simultaneous-prefetches",
 753           "The number of prefetches that can run at the same time",
 754           3, 0, 0)
 755
 756 /* The size of L1 cache in kB.  */
 757
 758 DEFPARAM (PARAM_L1_CACHE_SIZE,
 759           "l1-cache-size",
 760           "The size of L1 cache",
 761           64, 0, 0)
 762
 763 /* The size of L1 cache line in bytes.  */
 764
 765 DEFPARAM (PARAM_L1_CACHE_LINE_SIZE,
 766           "l1-cache-line-size",
 767           "The size of L1 cache line",
 768           32, 0, 0)
 769
 770 /* The size of L2 cache in kB.  */
 771
 772 DEFPARAM (PARAM_L2_CACHE_SIZE,
 773           "l2-cache-size",
 774           "The size of L2 cache",
 775           512, 0, 0)
 776
 777 /* Whether we should use canonical types rather than deep "structural"
 778    type checking.  Setting this value to 1 (the default) improves
 779    compilation performance in the C++ and Objective-C++ front end;
 780    this value should only be set to zero to work around bugs in the
 781    canonical type system by disabling it.  */
 782
 783 DEFPARAM (PARAM_USE_CANONICAL_TYPES,
 784           "use-canonical-types",
 785           "Whether to use canonical types",
 786           1, 0, 1)
 787
 788 DEFPARAM (PARAM_MAX_PARTIAL_ANTIC_LENGTH,
 789           "max-partial-antic-length",
 790           "Maximum length of partial antic set when performing tree pre optimization",
 791           100, 0, 0)
 792
 793 /* The following is used as a stop-gap limit for cases where really huge
 794    SCCs blow up memory and compile-time use too much.  If we hit this limit,
 795    SCCVN and such FRE and PRE will be not done at all for the current
 796    function.  */
 797
 798 DEFPARAM (PARAM_SCCVN_MAX_SCC_SIZE,
 799           "sccvn-max-scc-size",
 800           "Maximum size of a SCC before SCCVN stops processing a function",
 801           10000, 10, 0)
 802
 803 /* The following is used as a stop-gap limit for cases where really huge
 804    functions blow up compile-time use too much.  It limits the number of
 805    alias-queries we do for finding common subexpressions for memory loads and
 806    stores.  The number of alias-queries is otherwise limited by the number of
 807    stores on paths to function entry.  */
 808
 809 DEFPARAM (PARAM_SCCVN_MAX_ALIAS_QUERIES_PER_ACCESS,
 810           "sccvn-max-alias-queries-per-access",
 811           "Maximum number of disambiguations to perform per memory access",
 812           1000, 0, 0)
 813
 814 DEFPARAM (PARAM_IRA_MAX_LOOPS_NUM,
 815           "ira-max-loops-num",
 816           "Max loops number for regional RA",
 817           100, 0, 0)
 818
 819 DEFPARAM (PARAM_IRA_MAX_CONFLICT_TABLE_SIZE,
 820           "ira-max-conflict-table-size",
 821           "Max size of conflict table in MB",
 822           1000, 0, 0)
 823
 824 DEFPARAM (PARAM_IRA_LOOP_RESERVED_REGS,
 825           "ira-loop-reserved-regs",
 826           "The number of registers in each class kept unused by loop invariant motion",
 827           2, 0, 0)
 828
 829 DEFPARAM (PARAM_LRA_MAX_CONSIDERED_RELOAD_PSEUDOS,
 830           "lra-max-considered-reload-pseudos",
 831           "The max number of reload pseudos which are considered during spilling a non-reload pseudo",
 832           500, 0, 0)
 833
 834 /* Switch initialization conversion will refuse to create arrays that are
 835    bigger than this parameter times the number of switch branches.  */
 836
 837 DEFPARAM (PARAM_SWITCH_CONVERSION_BRANCH_RATIO,
 838           "switch-conversion-max-branch-ratio",
 839           "The maximum ratio between array size and switch branches for "
 840           "a switch conversion to take place",
 841           8, 1, 0)
 842
 843 /* Size of tiles when doing loop blocking.  */
 844
 845 DEFPARAM (PARAM_LOOP_BLOCK_TILE_SIZE,
 846           "loop-block-tile-size",
 847           "size of tiles for loop blocking",
 848           51, 0, 0)
 849
 850 /* Size of unrolling factor for unroll-and-jam.  */
 851
 852 DEFPARAM (PARAM_LOOP_UNROLL_JAM_SIZE,
 853           "loop-unroll-jam-size",
 854           "size of unrolling factor for unroll-and-jam",
 855           4, 0, 0)
 856
 857 /* Size of the band formed by the strip mined dimension and the most inner one for unroll-and-jam.  */
 858
 859 DEFPARAM (PARAM_LOOP_UNROLL_JAM_DEPTH,
 860           "loop-unroll-jam-depth",
 861           "depth of unrolled loop for unroll-and-jam",
 862           2, 0, 0)
 863
 864
 865 /* Maximal number of parameters that we allow in a SCoP.  */
 866
 867 DEFPARAM (PARAM_GRAPHITE_MAX_NB_SCOP_PARAMS,
 868           "graphite-max-nb-scop-params",
 869           "maximum number of parameters in a SCoP",
 870           10, 0, 0)
 871
 872 /* Maximal number of basic blocks in the functions analyzed by Graphite.  */
 873
 874 DEFPARAM (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION,
 875           "graphite-max-bbs-per-function",
 876           "maximum number of basic blocks per function to be analyzed by Graphite",
 877           100, 0, 0)
 878
 879 /* Avoid data dependence analysis on very large loops.  */
 880 DEFPARAM (PARAM_LOOP_MAX_DATAREFS_FOR_DATADEPS,
 881           "loop-max-datarefs-for-datadeps",
 882           "Maximum number of datarefs in loop for building loop data dependencies",
 883           1000, 0, 0)
 884
 885 /* Avoid doing loop invariant motion on very large loops.  */
 886
 887 DEFPARAM (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
 888           "loop-invariant-max-bbs-in-loop",
 889           "Max basic blocks number in loop for loop invariant motion",
 890           10000, 0, 0)
 891
 892 /* When the parameter is 1, use the internal function id
 893    to look up for profile data. Otherwise, use a more stable
 894    external id based on assembler name and source location. */
 895 DEFPARAM (PARAM_PROFILE_FUNC_INTERNAL_ID,
 896          "profile-func-internal-id",
 897          "use internal function id in profile lookup",
 898           0, 0, 1)
 899
 900 /* When the parameter is 1, track the most frequent N target
 901    addresses in indirect-call profile. This disables
 902    indirect_call_profiler_v2 which tracks single target.  */
 903 DEFPARAM (PARAM_INDIR_CALL_TOPN_PROFILE,
 904          "indir-call-topn-profile",
 905          "track topn target addresses in indirect-call profile",
 906           0, 0, 1)
 907
 908 /* Avoid SLP vectorization of large basic blocks.  */
 909 DEFPARAM (PARAM_SLP_MAX_INSNS_IN_BB,
 910           "slp-max-insns-in-bb",
 911           "Maximum number of instructions in basic block to be considered for SLP vectorization",
 912           1000, 0, 0)
 913
 914 DEFPARAM (PARAM_MIN_INSN_TO_PREFETCH_RATIO,
 915           "min-insn-to-prefetch-ratio",
 916           "Min. ratio of insns to prefetches to enable prefetching for "
 917           "a loop with an unknown trip count",
 918           9, 0, 0)
 919
 920 DEFPARAM (PARAM_PREFETCH_MIN_INSN_TO_MEM_RATIO,
 921           "prefetch-min-insn-to-mem-ratio",
 922           "Min. ratio of insns to mem ops to enable prefetching in a loop",
 923           3, 0, 0)
 924
 925 /* Set maximum hash table size for var tracking.  */
 926
 927 DEFPARAM (PARAM_MAX_VARTRACK_SIZE,
 928           "max-vartrack-size",
 929           "Max. size of var tracking hash tables",
 930           50000000, 0, 0)
 931
 932 /* Set maximum recursion depth for var tracking expression expansion
 933    and resolution.  */
 934
 935 DEFPARAM (PARAM_MAX_VARTRACK_EXPR_DEPTH,
 936           "max-vartrack-expr-depth",
 937           "Max. recursion depth for expanding var tracking expressions",
 938           12, 0, 0)
 939
 940 /* Set maximum length of value location list for which var tracking
 941    should add reverse operations.  */
 942
 943 DEFPARAM (PARAM_MAX_VARTRACK_REVERSE_OP_SIZE,
 944           "max-vartrack-reverse-op-size",
 945           "Max. size of loc list for which reverse ops should be added",
 946           50, 0, 0)
 947
 948 /* Set minimum insn uid for non-debug insns.  */
 949
 950 DEFPARAM (PARAM_MIN_NONDEBUG_INSN_UID,
 951           "min-nondebug-insn-uid",
 952           "The minimum UID to be used for a nondebug insn",
 953           0, 1, 0)
 954
 955 DEFPARAM (PARAM_IPA_SRA_PTR_GROWTH_FACTOR,
 956           "ipa-sra-ptr-growth-factor",
 957           "Maximum allowed growth of size of new parameters ipa-sra replaces "
 958           "a pointer to an aggregate with",
 959           2, 0, 0)
 960
 961 DEFPARAM (PARAM_TM_MAX_AGGREGATE_SIZE,
 962           "tm-max-aggregate-size",
 963           "Size in bytes after which thread-local aggregates should be "
 964           "instrumented with the logging functions instead of save/restore "
 965           "pairs",
 966           9, 0, 0)
 967
 968 DEFPARAM (PARAM_SRA_MAX_SCALARIZATION_SIZE_SPEED,
 969           "sra-max-scalarization-size-Ospeed",
 970           "Maximum size, in storage units, of an aggregate which should be "
 971           "considered for scalarization when compiling for speed",
 972           0, 0, 0)
 973
 974 DEFPARAM (PARAM_SRA_MAX_SCALARIZATION_SIZE_SIZE,
 975           "sra-max-scalarization-size-Osize",
 976           "Maximum size, in storage units, of an aggregate which should be "
 977           "considered for scalarization when compiling for size",
 978           0, 0, 0)
 979
 980 DEFPARAM (PARAM_IPA_CP_VALUE_LIST_SIZE,
 981           "ipa-cp-value-list-size",
 982           "Maximum size of a list of values associated with each parameter for "
 983           "interprocedural constant propagation",
 984           8, 0, 0)
 985
 986 DEFPARAM (PARAM_IPA_CP_EVAL_THRESHOLD,
 987           "ipa-cp-eval-threshold",
 988           "Threshold ipa-cp opportunity evaluation that is still considered "
 989           "beneficial to clone.",
 990           500, 0, 0)
 991
 992 DEFPARAM (PARAM_IPA_MAX_AGG_ITEMS,
 993           "ipa-max-agg-items",
 994           "Maximum number of aggregate content items for a parameter in "
 995           "jump functions and lattices",
 996           16, 0, 0)
 997
 998 DEFPARAM (PARAM_IPA_CP_LOOP_HINT_BONUS,
 999           "ipa-cp-loop-hint-bonus",
1000           "Compile-time bonus IPA-CP assigns to candidates which make loop "
1001           "bounds or strides known.",
1002           64, 0, 0)
1003
1004 DEFPARAM (PARAM_IPA_CP_ARRAY_INDEX_HINT_BONUS,
1005           "ipa-cp-array-index-hint-bonus",
1006           "Compile-time bonus IPA-CP assigns to candidates which make an array "
1007           "index known.",
1008           48, 0, 0)
1009
1010 DEFPARAM (PARAM_IPA_MAX_AA_STEPS,
1011           "ipa-max-aa-steps",
1012           "Maximum number of statements that will be visited by IPA formal "
1013           "parameter analysis based on alias analysis in any given function",
1014           25000, 0, 0)
1015
1016 /* WHOPR partitioning configuration.  */
1017
1018 DEFPARAM (PARAM_LTO_PARTITIONS,
1019           "lto-partitions",
1020           "Number of partitions the program should be split to",
1021           32, 1, 0)
1022
1023 DEFPARAM (MIN_PARTITION_SIZE,
1024           "lto-min-partition",
1025           "Minimal size of a partition for LTO (in estimated instructions)",
1026           1000, 0, 0)
1027
1028 /* Diagnostic parameters.  */
1029
1030 DEFPARAM (CXX_MAX_NAMESPACES_FOR_DIAGNOSTIC_HELP,
1031           "cxx-max-namespaces-for-diagnostic-help",
1032           "Maximum number of namespaces to search for alternatives when "
1033           "name lookup fails",
1034           1000, 0, 0)
1035
1036 /* Maximum number of conditional store pairs that can be sunk.  */
1037 DEFPARAM (PARAM_MAX_STORES_TO_SINK,
1038           "max-stores-to-sink",
1039           "Maximum number of conditional store pairs that can be sunk",
1040           2, 0, 0)
1041
1042 /* Override CASE_VALUES_THRESHOLD of when to switch from doing switch
1043    statements via if statements to using a table jump operation.  If the value
1044    is 0, the default CASE_VALUES_THRESHOLD will be used.  */
1045 DEFPARAM (PARAM_CASE_VALUES_THRESHOLD,
1046           "case-values-threshold",
1047           "The smallest number of different values for which it is best to "
1048           "use a jump-table instead of a tree of conditional branches, "
1049           "if 0, use the default for the machine",
1050           0, 0, 0)
1051
1052 /* Data race flags for C++0x memory model compliance.  */
1053 DEFPARAM (PARAM_ALLOW_STORE_DATA_RACES,
1054           "allow-store-data-races",
1055           "Allow new data races on stores to be introduced",
1056           0, 0, 1)
1057
1058 /* Reassociation width to be used by tree reassoc optimization.  */
1059 DEFPARAM (PARAM_TREE_REASSOC_WIDTH,
1060           "tree-reassoc-width",
1061           "Set the maximum number of instructions executed in parallel in "
1062           "reassociated tree. If 0, use the target dependent heuristic.",
1063           0, 0, 0)
1064
1065 DEFPARAM (PARAM_MAX_TAIL_MERGE_COMPARISONS,
1066           "max-tail-merge-comparisons",
1067           "Maximum amount of similar bbs to compare a bb with",
1068           10, 0, 0)
1069
1070 DEFPARAM (PARAM_MAX_TAIL_MERGE_ITERATIONS,
1071           "max-tail-merge-iterations",
1072           "Maximum amount of iterations of the pass over a function",
1073           2, 0, 0)
1074
1075 /* Maximum number of strings for which strlen optimization pass will
1076    track string lenths.  */
1077 DEFPARAM (PARAM_MAX_TRACKED_STRLENS,
1078           "max-tracked-strlens",
1079           "Maximum number of strings for which strlen optimization pass will "
1080           "track string lengths",
1081           1000, 0, 0)
1082
1083 /* Keep this in sync with the sched_pressure_algorithm enum.  */
1084 DEFPARAM (PARAM_SCHED_PRESSURE_ALGORITHM,
1085           "sched-pressure-algorithm",
1086           "Which -fsched-pressure algorithm to apply",
1087           1, 1, 2)
1088
1089 /* Maximum length of candidate scans in straight-line strength reduction.  */
1090 DEFPARAM (PARAM_MAX_SLSR_CANDIDATE_SCAN,
1091           "max-slsr-cand-scan",
1092           "Maximum length of candidate scans for straight-line "
1093           "strength reduction",
1094           50, 1, 999999)
1095
1096 DEFPARAM (PARAM_ASAN_STACK,
1097          "asan-stack",
1098          "Enable asan stack protection",
1099          1, 0, 1)
1100
1101 DEFPARAM (PARAM_ASAN_GLOBALS,
1102          "asan-globals",
1103          "Enable asan globals protection",
1104          1, 0, 1)
1105
1106 DEFPARAM (PARAM_ASAN_INSTRUMENT_WRITES,
1107          "asan-instrument-writes",
1108          "Enable asan store operations protection",
1109          1, 0, 1)
1110
1111 DEFPARAM (PARAM_ASAN_INSTRUMENT_READS,
1112          "asan-instrument-reads",
1113          "Enable asan load operations protection",
1114          1, 0, 1)
1115
1116 DEFPARAM (PARAM_ASAN_MEMINTRIN,
1117          "asan-memintrin",
1118          "Enable asan builtin functions protection",
1119          1, 0, 1)
1120
1121 DEFPARAM (PARAM_ASAN_USE_AFTER_RETURN,
1122          "asan-use-after-return",
1123          "Enable asan detection of use-after-return bugs",
1124          1, 0, 1)
1125
1126 DEFPARAM (PARAM_ASAN_INSTRUMENTATION_WITH_CALL_THRESHOLD,
1127          "asan-instrumentation-with-call-threshold",
1128          "Use callbacks instead of inline code if number of accesses "
1129          "in function becomes greater or equal to this number",
1130          7000, 0, INT_MAX)
1131
1132 DEFPARAM (PARAM_UNINIT_CONTROL_DEP_ATTEMPTS,
1133           "uninit-control-dep-attempts",
1134           "Maximum number of nested calls to search for control dependencies "
1135           "during uninitialized variable analysis",
1136           1000, 1, 0)
1137
1138 DEFPARAM (PARAM_CHKP_MAX_CTOR_SIZE,
1139           "chkp-max-ctor-size",
1140           "Maximum number of statements to be included into a single static "
1141           "constructor generated by Pointer Bounds Checker",
1142           5000, 100, 0)
1143
1144 DEFPARAM (PARAM_MAX_FSM_THREAD_PATH_INSNS,
1145           "max-fsm-thread-path-insns",
1146           "Maximum number of instructions to copy when duplicating blocks on a finite state automaton jump thread path",
1147           100, 1, 999999)
1148
1149 DEFPARAM (PARAM_MAX_FSM_THREAD_LENGTH,
1150           "max-fsm-thread-length",
1151           "Maximum number of basic blocks on a finite state automaton jump thread path",
1152           10, 1, 999999)
1153
1154 DEFPARAM (PARAM_MAX_FSM_THREAD_PATHS,
1155           "max-fsm-thread-paths",
1156           "Maximum number of new jump thread paths to create for a finite state automaton",
1157           50, 1, 999999)
1158 /*
1159
1160 Local variables:
1161 mode:c
1162 End:
1163 */