gcc/params.def

   1 /* params.def - Run-time parameters.
   2    Copyright (C) 2001-2016 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    The DEFPARAMENUM<N> macro is similar, but instead of the minumum and maximum
  39    arguments, it contains a list of <N> allowed strings, corresponding to
  40    integer values 0..<N>-1.  Note that the default argument needs to be
  41    specified as one of the allowed strings, rather than an integer value.
  42
  43    Be sure to add an entry to invoke.texi summarizing the parameter.  */
  44
  45 /* When branch is predicted to be taken with probability lower than this
  46    threshold (in percent), then it is considered well predictable. */
  47 DEFPARAM (PARAM_PREDICTABLE_BRANCH_OUTCOME,
  48           "predictable-branch-outcome",
  49           "Maximal estimated outcome of branch considered predictable.",
  50           2, 0, 50)
  51
  52 DEFPARAM (PARAM_INLINE_MIN_SPEEDUP,
  53           "inline-min-speedup",
  54           "The minimal estimated speedup allowing inliner to ignore inline-insns-single and inline-isnsns-auto.",
  55           10, 0, 0)
  56
  57 /* The single function inlining limit. This is the maximum size
  58    of a function counted in internal gcc instructions (not in
  59    real machine instructions) that is eligible for inlining
  60    by the tree inliner.
  61    The default value is 450.
  62    Only functions marked inline (or methods defined in the class
  63    definition for C++) are affected by this.
  64    There are more restrictions to inlining: If inlined functions
  65    call other functions, the already inlined instructions are
  66    counted and once the recursive inline limit (see
  67    "max-inline-insns" parameter) is exceeded, the acceptable size
  68    gets decreased.  */
  69 DEFPARAM (PARAM_MAX_INLINE_INSNS_SINGLE,
  70           "max-inline-insns-single",
  71           "The maximum number of instructions in a single function eligible for inlining.",
  72           400, 0, 0)
  73
  74 /* The single function inlining limit for functions that are
  75    inlined by virtue of -finline-functions (-O3).
  76    This limit should be chosen to be below or equal to the limit
  77    that is applied to functions marked inlined (or defined in the
  78    class declaration in C++) given by the "max-inline-insns-single"
  79    parameter.
  80    The default value is 40.  */
  81 DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO,
  82           "max-inline-insns-auto",
  83           "The maximum number of instructions when automatically inlining.",
  84           40, 0, 0)
  85
  86 DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE,
  87           "max-inline-insns-recursive",
  88           "The maximum number of instructions inline function can grow to via recursive inlining.",
  89           450, 0, 0)
  90
  91 DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO,
  92           "max-inline-insns-recursive-auto",
  93           "The maximum number of instructions non-inline function can grow to via recursive inlining.",
  94           450, 0, 0)
  95
  96 DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH,
  97           "max-inline-recursive-depth",
  98           "The maximum depth of recursive inlining for inline functions.",
  99           8, 0, 0)
 100
 101 DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO,
 102           "max-inline-recursive-depth-auto",
 103           "The maximum depth of recursive inlining for non-inline functions.",
 104           8, 0, 0)
 105
 106 DEFPARAM (PARAM_MIN_INLINE_RECURSIVE_PROBABILITY,
 107           "min-inline-recursive-probability",
 108           "Inline recursively only when the probability of call being executed exceeds the parameter.",
 109           10, 0, 0)
 110
 111 /* Limit of iterations of early inliner.  This basically bounds number of
 112    nested indirect calls early inliner can resolve.  Deeper chains are still
 113    handled by late inlining.  */
 114 DEFPARAM (PARAM_EARLY_INLINER_MAX_ITERATIONS,
 115           "max-early-inliner-iterations",
 116           "The maximum number of nested indirect inlining performed by early inliner.",
 117           1, 0, 0)
 118
 119 /* Limit on probability of entry BB.  */
 120 DEFPARAM (PARAM_COMDAT_SHARING_PROBABILITY,
 121           "comdat-sharing-probability",
 122           "Probability that COMDAT function will be shared with different compilation unit.",
 123           20, 0, 0)
 124
 125 /* Limit on probability of entry BB.  */
 126 DEFPARAM (PARAM_PARTIAL_INLINING_ENTRY_PROBABILITY,
 127           "partial-inlining-entry-probability",
 128           "Maximum probability of the entry BB of split region (in percent relative to entry BB of the function) to make partial inlining happen.",
 129           70, 0, 0)
 130
 131 /* Limit the number of expansions created by the variable expansion
 132    optimization to avoid register pressure.  */
 133 DEFPARAM (PARAM_MAX_VARIABLE_EXPANSIONS,
 134           "max-variable-expansions-in-unroller",
 135           "If -fvariable-expansion-in-unroller is used, the maximum number of times that an individual variable will be expanded during loop unrolling.",
 136           1, 0, 0)
 137
 138 /* Limit loop autovectorization to loops with large enough iteration count.  */
 139 DEFPARAM (PARAM_MIN_VECT_LOOP_BOUND,
 140           "min-vect-loop-bound",
 141           "If -ftree-vectorize is used, the minimal loop bound of a loop to be considered for vectorization.",
 142           1, 1, 0)
 143
 144 /* The maximum number of instructions to consider when looking for an
 145    instruction to fill a delay slot.  If more than this arbitrary
 146    number of instructions is searched, the time savings from filling
 147    the delay slot will be minimal so stop searching.  Increasing
 148    values mean more aggressive optimization, making the compile time
 149    increase with probably small improvement in executable run time.  */
 150 DEFPARAM (PARAM_MAX_DELAY_SLOT_INSN_SEARCH,
 151           "max-delay-slot-insn-search",
 152           "The maximum number of instructions to consider to fill a delay slot.",
 153           100, 0, 0)
 154
 155 /* When trying to fill delay slots, the maximum number of instructions
 156    to consider when searching for a block with valid live register
 157    information.  Increasing this arbitrarily chosen value means more
 158    aggressive optimization, increasing the compile time.  This
 159    parameter should be removed when the delay slot code is rewritten
 160    to maintain the control-flow graph.  */
 161 DEFPARAM(PARAM_MAX_DELAY_SLOT_LIVE_SEARCH,
 162          "max-delay-slot-live-search",
 163          "The maximum number of instructions to consider to find accurate live register information.",
 164          333, 0, 0)
 165
 166 /* This parameter limits the number of branch elements that the
 167    scheduler will track anti-dependencies through without resetting
 168    the tracking mechanism.  Large functions with few calls or barriers
 169    can generate lists containing many 1000's of dependencies.  Generally
 170    the compiler either uses all available memory, or runs for far too long.  */
 171 DEFPARAM(PARAM_MAX_PENDING_LIST_LENGTH,
 172          "max-pending-list-length",
 173          "The maximum length of scheduling's pending operations list.",
 174          32, 0, 0)
 175
 176 /* This parameter limits the number of backtracking attempts when using the
 177    haifa scheduler for modulo scheduling.  */
 178 DEFPARAM(PARAM_MAX_MODULO_BACKTRACK_ATTEMPTS,
 179          "max-modulo-backtrack-attempts",
 180          "The maximum number of backtrack attempts the scheduler should make when modulo scheduling a loop.",
 181          40, 0, 0)
 182
 183 DEFPARAM(PARAM_LARGE_FUNCTION_INSNS,
 184          "large-function-insns",
 185          "The size of function body to be considered large.",
 186          2700, 0, 0)
 187 DEFPARAM(PARAM_LARGE_FUNCTION_GROWTH,
 188          "large-function-growth",
 189          "Maximal growth due to inlining of large function (in percent).",
 190          100, 0, 0)
 191 DEFPARAM(PARAM_LARGE_UNIT_INSNS,
 192          "large-unit-insns",
 193          "The size of translation unit to be considered large.",
 194          10000, 0, 0)
 195 DEFPARAM(PARAM_INLINE_UNIT_GROWTH,
 196          "inline-unit-growth",
 197          "How much can given compilation unit grow because of the inlining (in percent).",
 198          20, 0, 0)
 199 DEFPARAM(PARAM_IPCP_UNIT_GROWTH,
 200          "ipcp-unit-growth",
 201          "How much can given compilation unit grow because of the interprocedural constant propagation (in percent).",
 202          10, 0, 0)
 203 DEFPARAM(PARAM_EARLY_INLINING_INSNS,
 204          "early-inlining-insns",
 205          "Maximal estimated growth of function body caused by early inlining of single call.",
 206          14, 0, 0)
 207 DEFPARAM(PARAM_LARGE_STACK_FRAME,
 208          "large-stack-frame",
 209          "The size of stack frame to be considered large.",
 210          256, 0, 0)
 211 DEFPARAM(PARAM_STACK_FRAME_GROWTH,
 212          "large-stack-frame-growth",
 213          "Maximal stack frame growth due to inlining (in percent).",
 214          1000, 0, 0)
 215
 216 /* The GCSE optimization will be disabled if it would require
 217    significantly more memory than this value.  */
 218 DEFPARAM(PARAM_MAX_GCSE_MEMORY,
 219          "max-gcse-memory",
 220          "The maximum amount of memory to be allocated by GCSE.",
 221          128 * 1024 * 1024, 0, 0)
 222
 223 /* The GCSE optimization of an expression will avoided if the ratio of
 224    insertions to deletions is greater than this value.  */
 225 DEFPARAM(PARAM_MAX_GCSE_INSERTION_RATIO,
 226          "max-gcse-insertion-ratio",
 227          "The maximum ratio of insertions to deletions of expressions in GCSE.",
 228          20, 0, 0)
 229
 230 /* This is the threshold ratio when to perform partial redundancy
 231    elimination after reload. We perform partial redundancy elimination
 232    when the following holds:
 233    (Redundant load execution count)
 234    ------------------------------- >= GCSE_AFTER_RELOAD_PARTIAL_FRACTION
 235    (Added loads execution count)                                          */
 236 DEFPARAM(PARAM_GCSE_AFTER_RELOAD_PARTIAL_FRACTION,
 237         "gcse-after-reload-partial-fraction",
 238         "The threshold ratio for performing partial redundancy elimination after reload.",
 239         3, 0, 0)
 240 /* This is the threshold ratio of the critical edges execution count compared to
 241    the redundant loads execution count that permits performing the load
 242    redundancy elimination in gcse after reload.  */
 243 DEFPARAM(PARAM_GCSE_AFTER_RELOAD_CRITICAL_FRACTION,
 244         "gcse-after-reload-critical-fraction",
 245         "The threshold ratio of critical edges execution count that permit performing redundancy elimination after reload.",
 246         10, 0, 0)
 247
 248 /* GCSE will use GCSE_COST_DISTANCE_RATION as a scaling factor
 249    to calculate maximum distance for which an expression is allowed to move
 250    from its rtx_cost.  */
 251 DEFPARAM(PARAM_GCSE_COST_DISTANCE_RATIO,
 252          "gcse-cost-distance-ratio",
 253          "Scaling factor in calculation of maximum distance an expression can be moved by GCSE optimizations.",
 254          10, 0, 0)
 255 /* GCSE won't restrict distance for which an expression with rtx_cost greater
 256    than COSTS_N_INSN(GCSE_UNRESTRICTED_COST) is allowed to move.  */
 257 DEFPARAM(PARAM_GCSE_UNRESTRICTED_COST,
 258          "gcse-unrestricted-cost",
 259          "Cost at which GCSE optimizations will not constraint the distance an expression can travel.",
 260          3, 0, 0)
 261
 262 /* How deep from a given basic block the dominator tree should be searched
 263    for expressions to hoist to the block.  The value of 0 will avoid limiting
 264    the search.  */
 265 DEFPARAM(PARAM_MAX_HOIST_DEPTH,
 266          "max-hoist-depth",
 267          "Maximum depth of search in the dominator tree for expressions to hoist.",
 268          30, 0, 0)
 269
 270
 271 /* When synthesizing expnonentiation by a real constant operations using square
 272    roots, this controls how deep sqrt chains we are willing to generate.  */
 273 DEFPARAM(PARAM_MAX_POW_SQRT_DEPTH,
 274          "max-pow-sqrt-depth",
 275          "Maximum depth of sqrt chains to use when synthesizing exponentiation by a real constant.",
 276          5, 1, 32)
 277
 278 /* This parameter limits the number of insns in a loop that will be unrolled,
 279    and by how much the loop is unrolled.
 280
 281    This limit should be at most half of the peeling limits:  loop unroller
 282    decides to not unroll loops that iterate fewer than 2*number of allowed
 283    unrollings and thus we would have loops that are neither peeled or unrolled
 284    otherwise.  */
 285 DEFPARAM(PARAM_MAX_UNROLLED_INSNS,
 286          "max-unrolled-insns",
 287          "The maximum number of instructions to consider to unroll in a loop.",
 288          200, 0, 0)
 289 /* This parameter limits how many times the loop is unrolled depending
 290    on number of insns really executed in each iteration.  */
 291 DEFPARAM(PARAM_MAX_AVERAGE_UNROLLED_INSNS,
 292          "max-average-unrolled-insns",
 293          "The maximum number of instructions to consider to unroll in a loop on average.",
 294          80, 0, 0)
 295 /* The maximum number of unrollings of a single loop.  */
 296 DEFPARAM(PARAM_MAX_UNROLL_TIMES,
 297         "max-unroll-times",
 298         "The maximum number of unrollings of a single loop.",
 299         8, 0, 0)
 300 /* The maximum number of insns of a peeled loop.  */
 301 DEFPARAM(PARAM_MAX_PEELED_INSNS,
 302         "max-peeled-insns",
 303         "The maximum number of insns of a peeled loop.",
 304         100, 0, 0)
 305 /* The maximum number of peelings of a single loop.  */
 306 DEFPARAM(PARAM_MAX_PEEL_TIMES,
 307         "max-peel-times",
 308         "The maximum number of peelings of a single loop.",
 309         16, 0, 0)
 310 /* The maximum number of peelings of a single loop that is peeled completely.  */
 311 DEFPARAM(PARAM_MAX_PEEL_BRANCHES,
 312         "max-peel-branches",
 313         "The maximum number of branches on the path through the peeled sequence.",
 314         32, 0, 0)
 315 /* The maximum number of insns of a peeled loop.  */
 316 DEFPARAM(PARAM_MAX_COMPLETELY_PEELED_INSNS,
 317         "max-completely-peeled-insns",
 318         "The maximum number of insns of a completely peeled loop.",
 319         200, 0, 0)
 320 /* The maximum number of peelings of a single loop that is peeled completely.  */
 321 DEFPARAM(PARAM_MAX_COMPLETELY_PEEL_TIMES,
 322         "max-completely-peel-times",
 323         "The maximum number of peelings of a single loop that is peeled completely.",
 324         16, 0, 0)
 325 /* The maximum number of insns of a peeled loop that rolls only once.  */
 326 DEFPARAM(PARAM_MAX_ONCE_PEELED_INSNS,
 327         "max-once-peeled-insns",
 328         "The maximum number of insns of a peeled loop that rolls only once.",
 329         400, 0, 0)
 330 /* The maximum depth of a loop nest we completely peel.  */
 331 DEFPARAM(PARAM_MAX_UNROLL_ITERATIONS,
 332          "max-completely-peel-loop-nest-depth",
 333          "The maximum depth of a loop nest we completely peel.",
 334          8, 0, 0)
 335
 336 /* The maximum number of insns of an unswitched loop.  */
 337 DEFPARAM(PARAM_MAX_UNSWITCH_INSNS,
 338         "max-unswitch-insns",
 339         "The maximum number of insns of an unswitched loop.",
 340         50, 0, 0)
 341 /* The maximum level of recursion in unswitch_single_loop.  */
 342 DEFPARAM(PARAM_MAX_UNSWITCH_LEVEL,
 343         "max-unswitch-level",
 344         "The maximum number of unswitchings in a single loop.",
 345         3, 0, 0)
 346
 347 /* The maximum number of iterations of a loop the brute force algorithm
 348    for analysis of # of iterations of the loop tries to evaluate.  */
 349 DEFPARAM(PARAM_MAX_ITERATIONS_TO_TRACK,
 350         "max-iterations-to-track",
 351         "Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates.",
 352         1000, 0, 0)
 353 /* A cutoff to avoid costly computations of the number of iterations in
 354    the doloop transformation.  */
 355 DEFPARAM(PARAM_MAX_ITERATIONS_COMPUTATION_COST,
 356         "max-iterations-computation-cost",
 357         "Bound on the cost of an expression to compute the number of iterations.",
 358         10, 0, 0)
 359
 360 /* This parameter is used to tune SMS MAX II calculations.  */
 361 DEFPARAM(PARAM_SMS_MAX_II_FACTOR,
 362          "sms-max-ii-factor",
 363          "A factor for tuning the upper bound that swing modulo scheduler uses for scheduling a loop.",
 364          100, 0, 0)
 365 /* The minimum value of stage count that swing modulo scheduler will generate.  */
 366 DEFPARAM(PARAM_SMS_MIN_SC,
 367         "sms-min-sc",
 368         "The minimum value of stage count that swing modulo scheduler will generate.",
 369         2, 1, 1)
 370 DEFPARAM(PARAM_SMS_DFA_HISTORY,
 371          "sms-dfa-history",
 372          "The number of cycles the swing modulo scheduler considers when checking conflicts using DFA.",
 373          0, 0, 0)
 374 DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD,
 375          "sms-loop-average-count-threshold",
 376          "A threshold on the average loop count considered by the swing modulo scheduler.",
 377          0, 0, 0)
 378
 379 DEFPARAM(HOT_BB_COUNT_WS_PERMILLE,
 380          "hot-bb-count-ws-permille",
 381          "A basic block profile count is considered hot if it contributes to "
 382          "the given permillage of the entire profiled execution.",
 383          999, 0, 1000)
 384 DEFPARAM(HOT_BB_FREQUENCY_FRACTION,
 385          "hot-bb-frequency-fraction",
 386          "Select fraction of the maximal frequency of executions of basic block in function given basic block needs to have to be considered hot.",
 387          1000, 0, 0)
 388
 389 DEFPARAM(UNLIKELY_BB_COUNT_FRACTION,
 390          "unlikely-bb-count-fraction",
 391          "The minimum fraction of profile runs a given basic block execution count must be not to be considered unlikely.",
 392          20, 1, 10000)
 393
 394 DEFPARAM (PARAM_ALIGN_THRESHOLD,
 395           "align-threshold",
 396           "Select fraction of the maximal frequency of executions of basic block in function given basic block get alignment.",
 397           100, 1, 0)
 398
 399 DEFPARAM (PARAM_ALIGN_LOOP_ITERATIONS,
 400           "align-loop-iterations",
 401           "Loops iterating at least selected number of iterations will get loop alignement..",
 402           4, 0, 0)
 403
 404 /* For guessed profiles, the loops having unknown number of iterations
 405    are predicted to iterate relatively few (10) times at average.
 406    For functions containing one loop with large known number of iterations
 407    and other loops having unbounded loops we would end up predicting all
 408    the other loops cold that is not usually the case.  So we need to artificially
 409    flatten the profile.
 410
 411    We need to cut the maximal predicted iterations to large enough iterations
 412    so the loop appears important, but safely within maximum hotness
 413    range.  */
 414
 415 DEFPARAM(PARAM_MAX_PREDICTED_ITERATIONS,
 416          "max-predicted-iterations",
 417          "The maximum number of loop iterations we predict statically.",
 418          100, 0, 0)
 419
 420 /* This parameter controls the probability of builtin_expect. The default
 421    value is 90%. This empirical value is obtained through the weighted
 422    probability of FDO counters (with the FDO count value as the weight)
 423    in some real world programs:
 424    (1) Google performance test benchmarks: the probability is 0.9081.
 425    (2) Linux 3.3 kernel running Google search workload: the probability
 426    is 0.8717.  */
 427
 428 DEFPARAM(BUILTIN_EXPECT_PROBABILITY,
 429          "builtin-expect-probability",
 430          "Set the estimated probability in percentage for builtin expect. The default value is 90% probability.",
 431          90, 0, 100)
 432 DEFPARAM(TRACER_DYNAMIC_COVERAGE_FEEDBACK,
 433          "tracer-dynamic-coverage-feedback",
 434          "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is available.",
 435          95, 0, 100)
 436 DEFPARAM(TRACER_DYNAMIC_COVERAGE,
 437          "tracer-dynamic-coverage",
 438          "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is not available.",
 439          75, 0, 100)
 440 DEFPARAM(TRACER_MAX_CODE_GROWTH,
 441          "tracer-max-code-growth",
 442          "Maximal code growth caused by tail duplication (in percent).",
 443          100, 0, 0)
 444 DEFPARAM(TRACER_MIN_BRANCH_RATIO,
 445          "tracer-min-branch-ratio",
 446          "Stop reverse growth if the reverse probability of best edge is less than this threshold (in percent).",
 447          10, 0, 100)
 448 DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY_FEEDBACK,
 449          "tracer-min-branch-probability-feedback",
 450          "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is available.",
 451          80, 0, 100)
 452 DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY,
 453          "tracer-min-branch-probability",
 454          "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is not available.",
 455          50, 0, 100)
 456
 457 /* The maximum number of incoming edges to consider for crossjumping.  */
 458 DEFPARAM(PARAM_MAX_CROSSJUMP_EDGES,
 459          "max-crossjump-edges",
 460          "The maximum number of incoming edges to consider for crossjumping.",
 461          100, 0, 0)
 462
 463 /* The minimum number of matching instructions to consider for crossjumping.  */
 464 DEFPARAM(PARAM_MIN_CROSSJUMP_INSNS,
 465      "min-crossjump-insns",
 466      "The minimum number of matching instructions to consider for crossjumping.",
 467      5, 1, 0)
 468
 469 /* The maximum number expansion factor when copying basic blocks.  */
 470 DEFPARAM(PARAM_MAX_GROW_COPY_BB_INSNS,
 471      "max-grow-copy-bb-insns",
 472      "The maximum expansion factor when copying basic blocks.",
 473      8, 0, 0)
 474
 475 /* The maximum number of insns to duplicate when unfactoring computed gotos.  */
 476 DEFPARAM(PARAM_MAX_GOTO_DUPLICATION_INSNS,
 477      "max-goto-duplication-insns",
 478      "The maximum number of insns to duplicate when unfactoring computed gotos.",
 479      8, 0, 0)
 480
 481 /* The maximum length of path considered in cse.  */
 482 DEFPARAM(PARAM_MAX_CSE_PATH_LENGTH,
 483          "max-cse-path-length",
 484          "The maximum length of path considered in cse.",
 485          10, 1, 0)
 486 DEFPARAM(PARAM_MAX_CSE_INSNS,
 487          "max-cse-insns",
 488          "The maximum instructions CSE process before flushing.",
 489          1000, 0, 0)
 490
 491 /* The cost of expression in loop invariant motion that is considered
 492    expensive.  */
 493 DEFPARAM(PARAM_LIM_EXPENSIVE,
 494          "lim-expensive",
 495          "The minimum cost of an expensive expression in the loop invariant motion.",
 496          20, 0, 0)
 497
 498 /* Bound on number of candidates for induction variables below that
 499    all candidates are considered for each use in induction variable
 500    optimizations.  */
 501
 502 DEFPARAM(PARAM_IV_CONSIDER_ALL_CANDIDATES_BOUND,
 503          "iv-consider-all-candidates-bound",
 504          "Bound on number of candidates below that all candidates are considered in iv optimizations.",
 505          30, 0, 0)
 506
 507 /* The induction variable optimizations give up on loops that contain more
 508    induction variable uses.  */
 509
 510 DEFPARAM(PARAM_IV_MAX_CONSIDERED_USES,
 511          "iv-max-considered-uses",
 512          "Bound on number of iv uses in loop optimized in iv optimizations.",
 513          250, 0, 0)
 514
 515 /* If there are at most this number of ivs in the set, try removing unnecessary
 516    ivs from the set always.  */
 517
 518 DEFPARAM(PARAM_IV_ALWAYS_PRUNE_CAND_SET_BOUND,
 519          "iv-always-prune-cand-set-bound",
 520          "If number of candidates in the set is smaller, we always try to remove unused ivs during its optimization.",
 521          10, 0, 0)
 522
 523 DEFPARAM(PARAM_SCEV_MAX_EXPR_SIZE,
 524          "scev-max-expr-size",
 525          "Bound on size of expressions used in the scalar evolutions analyzer.",
 526          100, 0, 0)
 527
 528 DEFPARAM(PARAM_SCEV_MAX_EXPR_COMPLEXITY,
 529          "scev-max-expr-complexity",
 530          "Bound on the complexity of the expressions in the scalar evolutions analyzer.",
 531          10, 0, 0)
 532
 533 DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS,
 534          "vect-max-version-for-alignment-checks",
 535          "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alignment check.",
 536          6, 0, 0)
 537
 538 DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS,
 539          "vect-max-version-for-alias-checks",
 540          "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alias check.",
 541          10, 0, 0)
 542
 543 DEFPARAM(PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT,
 544          "vect-max-peeling-for-alignment",
 545          "Max number of loop peels to enhancement alignment of data references in a loop.",
 546          -1, -1, 64)
 547
 548 DEFPARAM(PARAM_MAX_CSELIB_MEMORY_LOCATIONS,
 549          "max-cselib-memory-locations",
 550          "The maximum memory locations recorded by cselib.",
 551          500, 0, 0)
 552
 553 #ifdef ENABLE_GC_ALWAYS_COLLECT
 554 # define GGC_MIN_EXPAND_DEFAULT 0
 555 # define GGC_MIN_HEAPSIZE_DEFAULT 0
 556 #else
 557 # define GGC_MIN_EXPAND_DEFAULT 30
 558 # define GGC_MIN_HEAPSIZE_DEFAULT 4096
 559 #endif
 560
 561 DEFPARAM(GGC_MIN_EXPAND,
 562          "ggc-min-expand",
 563          "Minimum heap expansion to trigger garbage collection, as a percentage of the total size of the heap.",
 564          GGC_MIN_EXPAND_DEFAULT, 0, 0)
 565
 566 DEFPARAM(GGC_MIN_HEAPSIZE,
 567          "ggc-min-heapsize",
 568          "Minimum heap size before we start collecting garbage, in kilobytes.",
 569          GGC_MIN_HEAPSIZE_DEFAULT, 0, 0)
 570
 571 #undef GGC_MIN_EXPAND_DEFAULT
 572 #undef GGC_MIN_HEAPSIZE_DEFAULT
 573
 574 DEFPARAM(PARAM_MAX_RELOAD_SEARCH_INSNS,
 575          "max-reload-search-insns",
 576          "The maximum number of instructions to search backward when looking for equivalent reload.",
 577          100, 0, 0)
 578
 579 DEFPARAM(PARAM_SINK_FREQUENCY_THRESHOLD,
 580          "sink-frequency-threshold",
 581          "Target block's relative execution frequency (as a percentage) required to sink a statement.",
 582          75, 0, 100)
 583
 584 DEFPARAM(PARAM_MAX_SCHED_REGION_BLOCKS,
 585          "max-sched-region-blocks",
 586          "The maximum number of blocks in a region to be considered for interblock scheduling.",
 587          10, 0, 0)
 588
 589 DEFPARAM(PARAM_MAX_SCHED_REGION_INSNS,
 590          "max-sched-region-insns",
 591          "The maximum number of insns in a region to be considered for interblock scheduling.",
 592          100, 0, 0)
 593
 594 DEFPARAM(PARAM_MAX_PIPELINE_REGION_BLOCKS,
 595          "max-pipeline-region-blocks",
 596          "The maximum number of blocks in a region to be considered for interblock scheduling.",
 597          15, 0, 0)
 598
 599 DEFPARAM(PARAM_MAX_PIPELINE_REGION_INSNS,
 600          "max-pipeline-region-insns",
 601          "The maximum number of insns in a region to be considered for interblock scheduling.",
 602          200, 0, 0)
 603
 604 DEFPARAM(PARAM_MIN_SPEC_PROB,
 605          "min-spec-prob",
 606          "The minimum probability of reaching a source block for interblock speculative scheduling.",
 607          40, 0, 0)
 608
 609 DEFPARAM(PARAM_MAX_SCHED_EXTEND_REGIONS_ITERS,
 610          "max-sched-extend-regions-iters",
 611          "The maximum number of iterations through CFG to extend regions.",
 612          0, 0, 0)
 613
 614 DEFPARAM(PARAM_MAX_SCHED_INSN_CONFLICT_DELAY,
 615          "max-sched-insn-conflict-delay",
 616          "The maximum conflict delay for an insn to be considered for speculative motion.",
 617          3, 1, 10)
 618
 619 DEFPARAM(PARAM_SCHED_SPEC_PROB_CUTOFF,
 620          "sched-spec-prob-cutoff",
 621          "The minimal probability of speculation success (in percents), so that speculative insn will be scheduled.",
 622          40, 0, 100)
 623
 624 DEFPARAM(PARAM_SCHED_STATE_EDGE_PROB_CUTOFF,
 625          "sched-state-edge-prob-cutoff",
 626          "The minimum probability an edge must have for the scheduler to save its state across it.",
 627          10, 0, 100)
 628
 629 DEFPARAM(PARAM_SELSCHED_MAX_LOOKAHEAD,
 630          "selsched-max-lookahead",
 631          "The maximum size of the lookahead window of selective scheduling.",
 632          50, 0, 0)
 633
 634 DEFPARAM(PARAM_SELSCHED_MAX_SCHED_TIMES,
 635          "selsched-max-sched-times",
 636          "Maximum number of times that an insn could be scheduled.",
 637          2, 0, 0)
 638
 639 DEFPARAM(PARAM_SELSCHED_INSNS_TO_RENAME,
 640          "selsched-insns-to-rename",
 641          "Maximum number of instructions in the ready list that are considered eligible for renaming.",
 642          2, 0, 0)
 643
 644 DEFPARAM (PARAM_SCHED_MEM_TRUE_DEP_COST,
 645           "sched-mem-true-dep-cost",
 646           "Minimal distance between possibly conflicting store and load.",
 647           1, 0, 0)
 648
 649 DEFPARAM (PARAM_SCHED_AUTOPREF_QUEUE_DEPTH,
 650           "sched-autopref-queue-depth",
 651           "Hardware autoprefetcher scheduler model control flag.  Number of lookahead cycles the model looks into; at '0' only enable instruction sorting heuristic.  Disabled by default.",
 652           -1, 0, 0)
 653
 654 DEFPARAM(PARAM_MAX_LAST_VALUE_RTL,
 655          "max-last-value-rtl",
 656          "The maximum number of RTL nodes that can be recorded as combiner's last value.",
 657          10000, 0, 0)
 658
 659 DEFPARAM(PARAM_MAX_COMBINE_INSNS,
 660          "max-combine-insns",
 661          "The maximum number of insns combine tries to combine.",
 662          4, 2, 4)
 663
 664 /* INTEGER_CST nodes are shared for values [{-1,0} .. N) for
 665    {signed,unsigned} integral types.  This determines N.
 666    Experimentation shows 251 to be a good value that generates the
 667    least amount of garbage for allocating the TREE_VEC storage.  */
 668 DEFPARAM (PARAM_INTEGER_SHARE_LIMIT,
 669           "integer-share-limit",
 670           "The upper bound for sharing integer constants.",
 671           251, 2, 2)
 672
 673 DEFPARAM (PARAM_SSP_BUFFER_SIZE,
 674           "ssp-buffer-size",
 675           "The lower bound for a buffer to be considered for stack smashing protection.",
 676           8, 1, 0)
 677
 678 DEFPARAM (PARAM_MIN_SIZE_FOR_STACK_SHARING,
 679           "min-size-for-stack-sharing",
 680           "The minimum size of variables taking part in stack slot sharing "
 681           "when not optimizing.",
 682           32, 0, 0)
 683
 684 /* When we thread through a block we have to make copies of the
 685    statements within the block.  Clearly for large blocks the code
 686    duplication is bad.
 687
 688    PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS specifies the maximum number
 689    of statements and PHI nodes allowed in a block which is going to
 690    be duplicated for thread jumping purposes.
 691
 692    Some simple analysis showed that more than 99% of the jump
 693    threading opportunities are for blocks with less than 15
 694    statements.  So we can get the benefits of jump threading
 695    without excessive code bloat for pathological cases with the
 696    throttle set at 15 statements.  */
 697 DEFPARAM (PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS,
 698           "max-jump-thread-duplication-stmts",
 699           "Maximum number of statements allowed in a block that needs to be duplicated when threading jumps.",
 700           15, 0, 0)
 701
 702 /* This is the maximum number of fields a variable may have before the pointer analysis machinery
 703    will stop trying to treat it in a field-sensitive manner.
 704    There are programs out there with thousands of fields per structure, and handling them
 705    field-sensitively is not worth the cost.  */
 706 DEFPARAM (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
 707           "max-fields-for-field-sensitive",
 708           "Maximum number of fields in a structure before pointer analysis treats the structure as a single variable.",
 709           0, 0, 0)
 710
 711 DEFPARAM(PARAM_MAX_SCHED_READY_INSNS,
 712          "max-sched-ready-insns",
 713          "The maximum number of instructions ready to be issued to be considered by the scheduler during the first scheduling pass.",
 714          100, 0, 0)
 715
 716 /* This is the maximum number of active local stores RTL DSE will consider.  */
 717 DEFPARAM (PARAM_MAX_DSE_ACTIVE_LOCAL_STORES,
 718           "max-dse-active-local-stores",
 719           "Maximum number of active local stores in RTL dead store elimination.",
 720           5000, 0, 0)
 721
 722 /* Prefetching and cache-optimizations related parameters.  Default values are
 723    usually set by machine description.  */
 724
 725 /* The number of insns executed before prefetch is completed.  */
 726
 727 DEFPARAM (PARAM_PREFETCH_LATENCY,
 728          "prefetch-latency",
 729          "The number of insns executed before prefetch is completed.",
 730          200, 0, 0)
 731
 732 /* The number of prefetches that can run at the same time.  */
 733
 734 DEFPARAM (PARAM_SIMULTANEOUS_PREFETCHES,
 735           "simultaneous-prefetches",
 736           "The number of prefetches that can run at the same time.",
 737           3, 0, 0)
 738
 739 /* The size of L1 cache in kB.  */
 740
 741 DEFPARAM (PARAM_L1_CACHE_SIZE,
 742           "l1-cache-size",
 743           "The size of L1 cache.",
 744           64, 0, 0)
 745
 746 /* The size of L1 cache line in bytes.  */
 747
 748 DEFPARAM (PARAM_L1_CACHE_LINE_SIZE,
 749           "l1-cache-line-size",
 750           "The size of L1 cache line.",
 751           32, 0, 0)
 752
 753 /* The size of L2 cache in kB.  */
 754
 755 DEFPARAM (PARAM_L2_CACHE_SIZE,
 756           "l2-cache-size",
 757           "The size of L2 cache.",
 758           512, 0, 0)
 759
 760 /* Whether we should use canonical types rather than deep "structural"
 761    type checking.  Setting this value to 1 (the default) improves
 762    compilation performance in the C++ and Objective-C++ front end;
 763    this value should only be set to zero to work around bugs in the
 764    canonical type system by disabling it.  */
 765
 766 DEFPARAM (PARAM_USE_CANONICAL_TYPES,
 767           "use-canonical-types",
 768           "Whether to use canonical types.",
 769           1, 0, 1)
 770
 771 DEFPARAM (PARAM_MAX_PARTIAL_ANTIC_LENGTH,
 772           "max-partial-antic-length",
 773           "Maximum length of partial antic set when performing tree pre optimization.",
 774           100, 0, 0)
 775
 776 /* The following is used as a stop-gap limit for cases where really huge
 777    SCCs blow up memory and compile-time use too much.  If we hit this limit,
 778    SCCVN and such FRE and PRE will be not done at all for the current
 779    function.  */
 780
 781 DEFPARAM (PARAM_SCCVN_MAX_SCC_SIZE,
 782           "sccvn-max-scc-size",
 783           "Maximum size of a SCC before SCCVN stops processing a function.",
 784           10000, 10, 0)
 785
 786 /* The following is used as a stop-gap limit for cases where really huge
 787    functions blow up compile-time use too much.  It limits the number of
 788    alias-queries we do for finding common subexpressions for memory loads and
 789    stores.  The number of alias-queries is otherwise limited by the number of
 790    stores on paths to function entry.  */
 791
 792 DEFPARAM (PARAM_SCCVN_MAX_ALIAS_QUERIES_PER_ACCESS,
 793           "sccvn-max-alias-queries-per-access",
 794           "Maximum number of disambiguations to perform per memory access.",
 795           1000, 0, 0)
 796
 797 DEFPARAM (PARAM_IRA_MAX_LOOPS_NUM,
 798           "ira-max-loops-num",
 799           "Max loops number for regional RA.",
 800           100, 0, 0)
 801
 802 DEFPARAM (PARAM_IRA_MAX_CONFLICT_TABLE_SIZE,
 803           "ira-max-conflict-table-size",
 804           "Max size of conflict table in MB.",
 805           1000, 0, 0)
 806
 807 DEFPARAM (PARAM_IRA_LOOP_RESERVED_REGS,
 808           "ira-loop-reserved-regs",
 809           "The number of registers in each class kept unused by loop invariant motion.",
 810           2, 0, 0)
 811
 812 DEFPARAM (PARAM_LRA_MAX_CONSIDERED_RELOAD_PSEUDOS,
 813           "lra-max-considered-reload-pseudos",
 814           "The max number of reload pseudos which are considered during spilling a non-reload pseudo.",
 815           500, 0, 0)
 816
 817 DEFPARAM (PARAM_LRA_INHERITANCE_EBB_PROBABILITY_CUTOFF,
 818           "lra-inheritance-ebb-probability-cutoff",
 819           "Minimal fall-through edge probability in percentage used to add BB to inheritance EBB in LRA.",
 820           40, 0, 100)
 821
 822 /* Switch initialization conversion will refuse to create arrays that are
 823    bigger than this parameter times the number of switch branches.  */
 824
 825 DEFPARAM (PARAM_SWITCH_CONVERSION_BRANCH_RATIO,
 826           "switch-conversion-max-branch-ratio",
 827           "The maximum ratio between array size and switch branches for "
 828           "a switch conversion to take place.",
 829           8, 1, 0)
 830
 831 /* Size of tiles when doing loop blocking.  */
 832
 833 DEFPARAM (PARAM_LOOP_BLOCK_TILE_SIZE,
 834           "loop-block-tile-size",
 835           "size of tiles for loop blocking.",
 836           51, 0, 0)
 837
 838 /* Maximal number of parameters that we allow in a SCoP.  */
 839
 840 DEFPARAM (PARAM_GRAPHITE_MAX_NB_SCOP_PARAMS,
 841           "graphite-max-nb-scop-params",
 842           "maximum number of parameters in a SCoP.",
 843           7, 0, 0)
 844
 845 /* Maximal number of basic blocks in the functions analyzed by Graphite.  */
 846
 847 DEFPARAM (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION,
 848           "graphite-max-bbs-per-function",
 849           "maximum number of basic blocks per function to be analyzed by Graphite.",
 850           100, 0, 0)
 851
 852 /* Maximal number of array references in a scop.  */
 853
 854 DEFPARAM (PARAM_GRAPHITE_MAX_ARRAYS_PER_SCOP,
 855           "graphite-max-arrays-per-scop",
 856           "maximum number of arrays per scop.",
 857           100, 0, 0)
 858
 859 /* Maximal number of basic blocks in the functions analyzed by Graphite.  */
 860
 861 DEFPARAM (PARAM_GRAPHITE_MIN_LOOPS_PER_FUNCTION,
 862           "graphite-min-loops-per-function",
 863           "minimal number of loops per function to be analyzed by Graphite.",
 864           2, 0, 0)
 865
 866 DEFPARAM (PARAM_MAX_ISL_OPERATIONS,
 867           "max-isl-operations",
 868           "maximum number of isl operations, 0 means unlimited",
 869           350000, 0, 0)
 870
 871 /* Avoid data dependence analysis on very large loops.  */
 872 DEFPARAM (PARAM_LOOP_MAX_DATAREFS_FOR_DATADEPS,
 873           "loop-max-datarefs-for-datadeps",
 874           "Maximum number of datarefs in loop for building loop data dependencies.",
 875           1000, 0, 0)
 876
 877 /* Avoid doing loop invariant motion on very large loops.  */
 878
 879 DEFPARAM (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
 880           "loop-invariant-max-bbs-in-loop",
 881           "Max basic blocks number in loop for loop invariant motion.",
 882           10000, 0, 0)
 883
 884 /* When the parameter is 1, use the internal function id
 885    to look up for profile data. Otherwise, use a more stable
 886    external id based on assembler name and source location. */
 887 DEFPARAM (PARAM_PROFILE_FUNC_INTERNAL_ID,
 888          "profile-func-internal-id",
 889          "use internal function id in profile lookup.",
 890           0, 0, 1)
 891
 892 /* When the parameter is 1, track the most frequent N target
 893    addresses in indirect-call profile. This disables
 894    indirect_call_profiler_v2 which tracks single target.  */
 895 DEFPARAM (PARAM_INDIR_CALL_TOPN_PROFILE,
 896          "indir-call-topn-profile",
 897          "track topn target addresses in indirect-call profile.",
 898           0, 0, 1)
 899
 900 /* Avoid SLP vectorization of large basic blocks.  */
 901 DEFPARAM (PARAM_SLP_MAX_INSNS_IN_BB,
 902           "slp-max-insns-in-bb",
 903           "Maximum number of instructions in basic block to be considered for SLP vectorization.",
 904           1000, 0, 0)
 905
 906 DEFPARAM (PARAM_MIN_INSN_TO_PREFETCH_RATIO,
 907           "min-insn-to-prefetch-ratio",
 908           "Min. ratio of insns to prefetches to enable prefetching for "
 909           "a loop with an unknown trip count.",
 910           9, 0, 0)
 911
 912 DEFPARAM (PARAM_PREFETCH_MIN_INSN_TO_MEM_RATIO,
 913           "prefetch-min-insn-to-mem-ratio",
 914           "Min. ratio of insns to mem ops to enable prefetching in a loop.",
 915           3, 0, 0)
 916
 917 /* Set maximum hash table size for var tracking.  */
 918
 919 DEFPARAM (PARAM_MAX_VARTRACK_SIZE,
 920           "max-vartrack-size",
 921           "Max. size of var tracking hash tables.",
 922           50000000, 0, 0)
 923
 924 /* Set maximum recursion depth for var tracking expression expansion
 925    and resolution.  */
 926
 927 DEFPARAM (PARAM_MAX_VARTRACK_EXPR_DEPTH,
 928           "max-vartrack-expr-depth",
 929           "Max. recursion depth for expanding var tracking expressions.",
 930           12, 0, 0)
 931
 932 /* Set maximum length of value location list for which var tracking
 933    should add reverse operations.  */
 934
 935 DEFPARAM (PARAM_MAX_VARTRACK_REVERSE_OP_SIZE,
 936           "max-vartrack-reverse-op-size",
 937           "Max. size of loc list for which reverse ops should be added.",
 938           50, 0, 0)
 939
 940 /* Set minimum insn uid for non-debug insns.  */
 941
 942 DEFPARAM (PARAM_MIN_NONDEBUG_INSN_UID,
 943           "min-nondebug-insn-uid",
 944           "The minimum UID to be used for a nondebug insn.",
 945           0, 1, 0)
 946
 947 DEFPARAM (PARAM_IPA_SRA_PTR_GROWTH_FACTOR,
 948           "ipa-sra-ptr-growth-factor",
 949           "Maximum allowed growth of size of new parameters ipa-sra replaces "
 950           "a pointer to an aggregate with.",
 951           2, 0, 0)
 952
 953 DEFPARAM (PARAM_TM_MAX_AGGREGATE_SIZE,
 954           "tm-max-aggregate-size",
 955           "Size in bytes after which thread-local aggregates should be "
 956           "instrumented with the logging functions instead of save/restore "
 957           "pairs.",
 958           9, 0, 0)
 959
 960 DEFPARAM (PARAM_SRA_MAX_SCALARIZATION_SIZE_SPEED,
 961           "sra-max-scalarization-size-Ospeed",
 962           "Maximum size, in storage units, of an aggregate which should be "
 963           "considered for scalarization when compiling for speed.",
 964           0, 0, 0)
 965
 966 DEFPARAM (PARAM_SRA_MAX_SCALARIZATION_SIZE_SIZE,
 967           "sra-max-scalarization-size-Osize",
 968           "Maximum size, in storage units, of an aggregate which should be "
 969           "considered for scalarization when compiling for size.",
 970           0, 0, 0)
 971
 972 DEFPARAM (PARAM_IPA_CP_VALUE_LIST_SIZE,
 973           "ipa-cp-value-list-size",
 974           "Maximum size of a list of values associated with each parameter for "
 975           "interprocedural constant propagation.",
 976           8, 0, 0)
 977
 978 DEFPARAM (PARAM_IPA_CP_EVAL_THRESHOLD,
 979           "ipa-cp-eval-threshold",
 980           "Threshold ipa-cp opportunity evaluation that is still considered "
 981           "beneficial to clone..",
 982           500, 0, 0)
 983
 984 DEFPARAM (PARAM_IPA_CP_RECURSION_PENALTY,
 985           "ipa-cp-recursion-penalty",
 986           "Percentage penalty the recursive functions will receive when they "
 987           "are evaluated for cloning..",
 988           40, 0, 100)
 989
 990 DEFPARAM (PARAM_IPA_CP_SINGLE_CALL_PENALTY,
 991           "ipa-cp-single-call-penalty",
 992           "Percentage penalty functions containg a single call to another "
 993           "function will receive when they are evaluated for cloning..",
 994           15, 0, 100)
 995
 996 DEFPARAM (PARAM_IPA_MAX_AGG_ITEMS,
 997           "ipa-max-agg-items",
 998           "Maximum number of aggregate content items for a parameter in "
 999           "jump functions and lattices.",
1000           16, 0, 0)
1001
1002 DEFPARAM (PARAM_IPA_CP_LOOP_HINT_BONUS,
1003           "ipa-cp-loop-hint-bonus",
1004           "Compile-time bonus IPA-CP assigns to candidates which make loop "
1005           "bounds or strides known..",
1006           64, 0, 0)
1007
1008 DEFPARAM (PARAM_IPA_CP_ARRAY_INDEX_HINT_BONUS,
1009           "ipa-cp-array-index-hint-bonus",
1010           "Compile-time bonus IPA-CP assigns to candidates which make an array "
1011           "index known..",
1012           48, 0, 0)
1013
1014 DEFPARAM (PARAM_IPA_MAX_AA_STEPS,
1015           "ipa-max-aa-steps",
1016           "Maximum number of statements that will be visited by IPA formal "
1017           "parameter analysis based on alias analysis in any given function.",
1018           25000, 0, 0)
1019
1020 /* WHOPR partitioning configuration.  */
1021
1022 DEFPARAM (PARAM_LTO_PARTITIONS,
1023           "lto-partitions",
1024           "Number of partitions the program should be split to.",
1025           32, 1, 0)
1026
1027 DEFPARAM (MIN_PARTITION_SIZE,
1028           "lto-min-partition",
1029           "Minimal size of a partition for LTO (in estimated instructions).",
1030           1000, 0, 0)
1031
1032 /* Diagnostic parameters.  */
1033
1034 DEFPARAM (CXX_MAX_NAMESPACES_FOR_DIAGNOSTIC_HELP,
1035           "cxx-max-namespaces-for-diagnostic-help",
1036           "Maximum number of namespaces to search for alternatives when "
1037           "name lookup fails.",
1038           1000, 0, 0)
1039
1040 /* Maximum number of conditional store pairs that can be sunk.  */
1041 DEFPARAM (PARAM_MAX_STORES_TO_SINK,
1042           "max-stores-to-sink",
1043           "Maximum number of conditional store pairs that can be sunk.",
1044           2, 0, 0)
1045
1046 /* Override CASE_VALUES_THRESHOLD of when to switch from doing switch
1047    statements via if statements to using a table jump operation.  If the value
1048    is 0, the default CASE_VALUES_THRESHOLD will be used.  */
1049 DEFPARAM (PARAM_CASE_VALUES_THRESHOLD,
1050           "case-values-threshold",
1051           "The smallest number of different values for which it is best to "
1052           "use a jump-table instead of a tree of conditional branches, "
1053           "if 0, use the default for the machine.",
1054           0, 0, 0)
1055
1056 /* Data race flags for C++0x memory model compliance.  */
1057 DEFPARAM (PARAM_ALLOW_STORE_DATA_RACES,
1058           "allow-store-data-races",
1059           "Allow new data races on stores to be introduced.",
1060           0, 0, 1)
1061
1062 /* Reassociation width to be used by tree reassoc optimization.  */
1063 DEFPARAM (PARAM_TREE_REASSOC_WIDTH,
1064           "tree-reassoc-width",
1065           "Set the maximum number of instructions executed in parallel in "
1066           "reassociated tree. If 0, use the target dependent heuristic..",
1067           0, 0, 0)
1068
1069 DEFPARAM (PARAM_MAX_TAIL_MERGE_COMPARISONS,
1070           "max-tail-merge-comparisons",
1071           "Maximum amount of similar bbs to compare a bb with.",
1072           10, 0, 0)
1073
1074 DEFPARAM (PARAM_MAX_TAIL_MERGE_ITERATIONS,
1075           "max-tail-merge-iterations",
1076           "Maximum amount of iterations of the pass over a function.",
1077           2, 0, 0)
1078
1079 /* Maximum number of strings for which strlen optimization pass will
1080    track string lenths.  */
1081 DEFPARAM (PARAM_MAX_TRACKED_STRLENS,
1082           "max-tracked-strlens",
1083           "Maximum number of strings for which strlen optimization pass will "
1084           "track string lengths.",
1085           10000, 0, 0)
1086
1087 /* Keep this in sync with the sched_pressure_algorithm enum.  */
1088 DEFPARAM (PARAM_SCHED_PRESSURE_ALGORITHM,
1089           "sched-pressure-algorithm",
1090           "Which -fsched-pressure algorithm to apply.",
1091           1, 1, 2)
1092
1093 /* Maximum length of candidate scans in straight-line strength reduction.  */
1094 DEFPARAM (PARAM_MAX_SLSR_CANDIDATE_SCAN,
1095           "max-slsr-cand-scan",
1096           "Maximum length of candidate scans for straight-line "
1097           "strength reduction.",
1098           50, 1, 999999)
1099
1100 DEFPARAM (PARAM_ASAN_STACK,
1101          "asan-stack",
1102          "Enable asan stack protection.",
1103          1, 0, 1)
1104
1105 DEFPARAM (PARAM_ASAN_GLOBALS,
1106          "asan-globals",
1107          "Enable asan globals protection.",
1108          1, 0, 1)
1109
1110 DEFPARAM (PARAM_ASAN_INSTRUMENT_WRITES,
1111          "asan-instrument-writes",
1112          "Enable asan store operations protection.",
1113          1, 0, 1)
1114
1115 DEFPARAM (PARAM_ASAN_INSTRUMENT_READS,
1116          "asan-instrument-reads",
1117          "Enable asan load operations protection.",
1118          1, 0, 1)
1119
1120 DEFPARAM (PARAM_ASAN_MEMINTRIN,
1121          "asan-memintrin",
1122          "Enable asan builtin functions protection.",
1123          1, 0, 1)
1124
1125 DEFPARAM (PARAM_ASAN_USE_AFTER_RETURN,
1126          "asan-use-after-return",
1127          "Enable asan detection of use-after-return bugs.",
1128          1, 0, 1)
1129
1130 DEFPARAM (PARAM_ASAN_INSTRUMENTATION_WITH_CALL_THRESHOLD,
1131          "asan-instrumentation-with-call-threshold",
1132          "Use callbacks instead of inline code if number of accesses "
1133          "in function becomes greater or equal to this number.",
1134          7000, 0, INT_MAX)
1135
1136 DEFPARAM (PARAM_UNINIT_CONTROL_DEP_ATTEMPTS,
1137           "uninit-control-dep-attempts",
1138           "Maximum number of nested calls to search for control dependencies "
1139           "during uninitialized variable analysis.",
1140           1000, 1, 0)
1141
1142 DEFPARAM (PARAM_CHKP_MAX_CTOR_SIZE,
1143           "chkp-max-ctor-size",
1144           "Maximum number of statements to be included into a single static "
1145           "constructor generated by Pointer Bounds Checker.",
1146           5000, 100, 0)
1147
1148 DEFPARAM (PARAM_MAX_FSM_THREAD_PATH_INSNS,
1149           "max-fsm-thread-path-insns",
1150           "Maximum number of instructions to copy when duplicating blocks on a finite state automaton jump thread path.",
1151           100, 1, 999999)
1152
1153 DEFPARAM (PARAM_MAX_FSM_THREAD_LENGTH,
1154           "max-fsm-thread-length",
1155           "Maximum number of basic blocks on a finite state automaton jump thread path.",
1156           10, 1, 999999)
1157
1158 DEFPARAM (PARAM_MAX_FSM_THREAD_PATHS,
1159           "max-fsm-thread-paths",
1160           "Maximum number of new jump thread paths to create for a finite state automaton.",
1161           50, 1, 999999)
1162
1163 DEFPARAM (PARAM_PARLOOPS_CHUNK_SIZE,
1164           "parloops-chunk-size",
1165           "Chunk size of omp schedule for loops parallelized by parloops.",
1166           0, 0, 0)
1167
1168 DEFPARAMENUM5 (PARAM_PARLOOPS_SCHEDULE,
1169                "parloops-schedule",
1170                "Schedule type of omp schedule for loops parallelized by "
1171                "parloops (static, dynamic, guided, auto, runtime).",
1172                static,
1173                static, dynamic, guided, auto, runtime)
1174
1175 DEFPARAM (PARAM_MAX_SSA_NAME_QUERY_DEPTH,
1176           "max-ssa-name-query-depth",
1177           "Maximum recursion depth allowed when querying a property of an"
1178           " SSA name.",
1179           2, 1, 0)
1180 /*
1181
1182 Local variables:
1183 mode:c
1184 End:
1185 */