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/* params.def - Run-time parameters.

   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,

   2011, 2012

   Free Software Foundation, Inc.

   Written by Mark Mitchell .

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY

WARRANTY; without even the implied warranty of MERCHANTABILITY or

FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

.  */

/* This file contains definitions for language-independent

   parameters.  The DEFPARAM macro takes 6 arguments:

     - The enumeral corresponding to this parameter.

     - The name that can be used to set this parameter using the

       command-line option `--param ='.

     - A help string explaining how the parameter is used.

     - A default value for the parameter.

     - The minimum acceptable value for the parameter.

     - The maximum acceptable value for the parameter (if greater than

     the minimum).

   Be sure to add an entry to invoke.texi summarizing the parameter.  */

/* When branch is predicted to be taken with probability lower than this

   threshold (in percent), then it is considered well predictable. */

DEFPARAM (PARAM_PREDICTABLE_BRANCH_OUTCOME,

          "predictable-branch-outcome",

          "Maximal estimated outcome of branch considered predictable",

          2, 0, 50)

/* The single function inlining limit. This is the maximum size

   of a function counted in internal gcc instructions (not in

   real machine instructions) that is eligible for inlining

   by the tree inliner.

   The default value is 450.

   Only functions marked inline (or methods defined in the class

   definition for C++) are affected by this.

   There are more restrictions to inlining: If inlined functions

   call other functions, the already inlined instructions are

   counted and once the recursive inline limit (see

   "max-inline-insns" parameter) is exceeded, the acceptable size

   gets decreased.  */

DEFPARAM (PARAM_MAX_INLINE_INSNS_SINGLE,

          "max-inline-insns-single",

          "The maximum number of instructions in a single function eligible for inlining",

          400, 0, 0)

/* The single function inlining limit for functions that are

   inlined by virtue of -finline-functions (-O3).

   This limit should be chosen to be below or equal to the limit

   that is applied to functions marked inlined (or defined in the

   class declaration in C++) given by the "max-inline-insns-single"

   parameter.

   The default value is 40.  */

DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO,

          "max-inline-insns-auto",

          "The maximum number of instructions when automatically inlining",

          40, 0, 0)

DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE,

          "max-inline-insns-recursive",

          "The maximum number of instructions inline function can grow to via recursive inlining",

          450, 0, 0)

DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO,

          "max-inline-insns-recursive-auto",

          "The maximum number of instructions non-inline function can grow to via recursive inlining",

          450, 0, 0)

DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH,

          "max-inline-recursive-depth",

          "The maximum depth of recursive inlining for inline functions",

          8, 0, 0)

DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO,

          "max-inline-recursive-depth-auto",

          "The maximum depth of recursive inlining for non-inline functions",

          8, 0, 0)

DEFPARAM (PARAM_MIN_INLINE_RECURSIVE_PROBABILITY,

          "min-inline-recursive-probability",

          "Inline recursively only when the probability of call being executed exceeds the parameter",

          10, 0, 0)

/* Limit of iterations of early inliner.  This basically bounds number of

   nested indirect calls early inliner can resolve.  Deeper chains are still

   handled by late inlining.  */

DEFPARAM (PARAM_EARLY_INLINER_MAX_ITERATIONS,

          "max-early-inliner-iterations",

          "The maximum number of nested indirect inlining performed by early inliner",

          10, 0, 0)

/* Limit on probability of entry BB.  */

DEFPARAM (PARAM_COMDAT_SHARING_PROBABILITY,

          "comdat-sharing-probability",

          "Probability that COMDAT function will be shared with different compilation unit",

          20, 0, 0)

/* Limit on probability of entry BB.  */

DEFPARAM (PARAM_PARTIAL_INLINING_ENTRY_PROBABILITY,

          "partial-inlining-entry-probability",

          "Maximum probability of the entry BB of split region (in percent relative to entry BB of the function) to make partial inlining happen",

          70, 0, 0)

/* Limit the number of expansions created by the variable expansion

   optimization to avoid register pressure.  */

DEFPARAM (PARAM_MAX_VARIABLE_EXPANSIONS,

          "max-variable-expansions-in-unroller",

          "If -fvariable-expansion-in-unroller is used, the maximum number of times that an individual variable will be expanded during loop unrolling",

          1, 0, 0)

/* Limit loop autovectorization to loops with large enough iteration count.  */

DEFPARAM (PARAM_MIN_VECT_LOOP_BOUND,

          "min-vect-loop-bound",

          "If -ftree-vectorize is used, the minimal loop bound of a loop to be considered for vectorization",

          1, 1, 0)

/* The maximum number of instructions to consider when looking for an

   instruction to fill a delay slot.  If more than this arbitrary

   number of instructions is searched, the time savings from filling

   the delay slot will be minimal so stop searching.  Increasing

   values mean more aggressive optimization, making the compile time

   increase with probably small improvement in executable run time.  */

DEFPARAM (PARAM_MAX_DELAY_SLOT_INSN_SEARCH,

          "max-delay-slot-insn-search",

          "The maximum number of instructions to consider to fill a delay slot",

          100, 0, 0)

/* When trying to fill delay slots, the maximum number of instructions

   to consider when searching for a block with valid live register

   information.  Increasing this arbitrarily chosen value means more

   aggressive optimization, increasing the compile time.  This

   parameter should be removed when the delay slot code is rewritten

   to maintain the control-flow graph.  */

DEFPARAM(PARAM_MAX_DELAY_SLOT_LIVE_SEARCH,

         "max-delay-slot-live-search",

         "The maximum number of instructions to consider to find accurate live register information",

         333, 0, 0)

/* This parameter limits the number of branch elements that the

   scheduler will track anti-dependencies through without resetting

   the tracking mechanism.  Large functions with few calls or barriers

   can generate lists containing many 1000's of dependencies.  Generally

   the compiler either uses all available memory, or runs for far too long.  */

DEFPARAM(PARAM_MAX_PENDING_LIST_LENGTH,

         "max-pending-list-length",

         "The maximum length of scheduling's pending operations list",

         32, 0, 0)

/* This parameter limits the number of backtracking attempts when using the

   haifa scheduler for modulo scheduling.  */

DEFPARAM(PARAM_MAX_MODULO_BACKTRACK_ATTEMPTS,

         "max-modulo-backtrack-attempts",

         "The maximum number of backtrack attempts the scheduler should make when modulo scheduling a loop",

         40, 0, 0)

DEFPARAM(PARAM_LARGE_FUNCTION_INSNS,

         "large-function-insns",

         "The size of function body to be considered large",

         2700, 0, 0)

DEFPARAM(PARAM_LARGE_FUNCTION_GROWTH,

         "large-function-growth",

         "Maximal growth due to inlining of large function (in percent)",

         100, 0, 0)

DEFPARAM(PARAM_LARGE_UNIT_INSNS,

         "large-unit-insns",

         "The size of translation unit to be considered large",

         10000, 0, 0)

DEFPARAM(PARAM_INLINE_UNIT_GROWTH,

         "inline-unit-growth",

         "How much can given compilation unit grow because of the inlining (in percent)",

         30, 0, 0)

DEFPARAM(PARAM_IPCP_UNIT_GROWTH,

         "ipcp-unit-growth",

         "How much can given compilation unit grow because of the interprocedural constant propagation (in percent)",

         10, 0, 0)

DEFPARAM(PARAM_EARLY_INLINING_INSNS,

         "early-inlining-insns",

         "Maximal estimated growth of function body caused by early inlining of single call",

         11, 0, 0)

DEFPARAM(PARAM_LARGE_STACK_FRAME,

         "large-stack-frame",

         "The size of stack frame to be considered large",

         256, 0, 0)

DEFPARAM(PARAM_STACK_FRAME_GROWTH,

         "large-stack-frame-growth",

         "Maximal stack frame growth due to inlining (in percent)",

         1000, 0, 0)

/* The GCSE optimization will be disabled if it would require

   significantly more memory than this value.  */

DEFPARAM(PARAM_MAX_GCSE_MEMORY,

         "max-gcse-memory",

         "The maximum amount of memory to be allocated by GCSE",

         50 * 1024 * 1024, 0, 0)

/* The GCSE optimization of an expression will avoided if the ratio of

   insertions to deletions is greater than this value.  */

DEFPARAM(PARAM_MAX_GCSE_INSERTION_RATIO,

         "max-gcse-insertion-ratio",

         "The maximum ratio of insertions to deletions of expressions in GCSE",

         20, 0, 0)

/* This is the threshold ratio when to perform partial redundancy

   elimination after reload. We perform partial redundancy elimination

   when the following holds:

   (Redundant load execution count)

   ------------------------------- >= GCSE_AFTER_RELOAD_PARTIAL_FRACTION

   (Added loads execution count)                                          */

DEFPARAM(PARAM_GCSE_AFTER_RELOAD_PARTIAL_FRACTION,

        "gcse-after-reload-partial-fraction",

        "The threshold ratio for performing partial redundancy elimination after reload",

        3, 0, 0)

/* This is the threshold ratio of the critical edges execution count compared to

   the redundant loads execution count that permits performing the load

   redundancy elimination in gcse after reload.  */

DEFPARAM(PARAM_GCSE_AFTER_RELOAD_CRITICAL_FRACTION,

        "gcse-after-reload-critical-fraction",

        "The threshold ratio of critical edges execution count that permit performing redundancy elimination after reload",

        10, 0, 0)

/* GCSE will use GCSE_COST_DISTANCE_RATION as a scaling factor

   to calculate maximum distance for which an expression is allowed to move

   from its rtx_cost.  */

DEFPARAM(PARAM_GCSE_COST_DISTANCE_RATIO,

         "gcse-cost-distance-ratio",

         "Scaling factor in calculation of maximum distance an expression can be moved by GCSE optimizations",

         10, 0, 0)

/* GCSE won't restrict distance for which an expression with rtx_cost greater

   than COSTS_N_INSN(GCSE_UNRESTRICTED_COST) is allowed to move.  */

DEFPARAM(PARAM_GCSE_UNRESTRICTED_COST,

         "gcse-unrestricted-cost",

         "Cost at which GCSE optimizations will not constraint the distance an expression can travel",

         3, 0, 0)

/* How deep from a given basic block the dominator tree should be searched

   for expressions to hoist to the block.  The value of 0 will avoid limiting

   the search.  */

DEFPARAM(PARAM_MAX_HOIST_DEPTH,

         "max-hoist-depth",

         "Maximum depth of search in the dominator tree for expressions to hoist",

         30, 0, 0)

/* This parameter limits the number of insns in a loop that will be unrolled,

   and by how much the loop is unrolled.

   This limit should be at most half of the peeling limits:  loop unroller

   decides to not unroll loops that iterate fewer than 2*number of allowed

   unrollings and thus we would have loops that are neither peeled or unrolled

   otherwise.  */

DEFPARAM(PARAM_MAX_UNROLLED_INSNS,

         "max-unrolled-insns",

         "The maximum number of instructions to consider to unroll in a loop",

         200, 0, 0)

/* This parameter limits how many times the loop is unrolled depending

   on number of insns really executed in each iteration.  */

DEFPARAM(PARAM_MAX_AVERAGE_UNROLLED_INSNS,

         "max-average-unrolled-insns",

         "The maximum number of instructions to consider to unroll in a loop on average",

         80, 0, 0)

/* The maximum number of unrollings of a single loop.  */

DEFPARAM(PARAM_MAX_UNROLL_TIMES,

        "max-unroll-times",

        "The maximum number of unrollings of a single loop",

        8, 0, 0)

/* The maximum number of insns of a peeled loop.  */

DEFPARAM(PARAM_MAX_PEELED_INSNS,

        "max-peeled-insns",

        "The maximum number of insns of a peeled loop",

        400, 0, 0)

/* The maximum number of peelings of a single loop.  */

DEFPARAM(PARAM_MAX_PEEL_TIMES,

        "max-peel-times",

        "The maximum number of peelings of a single loop",

        16, 0, 0)

/* The maximum number of insns of a peeled loop.  */

DEFPARAM(PARAM_MAX_COMPLETELY_PEELED_INSNS,

        "max-completely-peeled-insns",

        "The maximum number of insns of a completely peeled loop",

        400, 0, 0)

/* The maximum number of peelings of a single loop that is peeled completely.  */

DEFPARAM(PARAM_MAX_COMPLETELY_PEEL_TIMES,

        "max-completely-peel-times",

        "The maximum number of peelings of a single loop that is peeled completely",

        16, 0, 0)

/* The maximum number of insns of a peeled loop that rolls only once.  */

DEFPARAM(PARAM_MAX_ONCE_PEELED_INSNS,

        "max-once-peeled-insns",

        "The maximum number of insns of a peeled loop that rolls only once",

        400, 0, 0)

/* The maximum depth of a loop nest we completely peel.  */

DEFPARAM(PARAM_MAX_UNROLL_ITERATIONS,

         "max-completely-peel-loop-nest-depth",

         "The maximum depth of a loop nest we completely peel",

         8, 0, 0)

/* The maximum number of insns of an unswitched loop.  */

DEFPARAM(PARAM_MAX_UNSWITCH_INSNS,

        "max-unswitch-insns",

        "The maximum number of insns of an unswitched loop",

        50, 0, 0)

/* The maximum level of recursion in unswitch_single_loop.  */

DEFPARAM(PARAM_MAX_UNSWITCH_LEVEL,

        "max-unswitch-level",

        "The maximum number of unswitchings in a single loop",

        3, 0, 0)

/* The maximum number of iterations of a loop the brute force algorithm

   for analysis of # of iterations of the loop tries to evaluate.  */

DEFPARAM(PARAM_MAX_ITERATIONS_TO_TRACK,

        "max-iterations-to-track",

        "Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates",

        1000, 0, 0)

/* A cutoff to avoid costly computations of the number of iterations in

   the doloop transformation.  */

DEFPARAM(PARAM_MAX_ITERATIONS_COMPUTATION_COST,

        "max-iterations-computation-cost",

        "Bound on the cost of an expression to compute the number of iterations",

        10, 0, 0)

/* This parameter is used to tune SMS MAX II calculations.  */

DEFPARAM(PARAM_SMS_MAX_II_FACTOR,

         "sms-max-ii-factor",

         "A factor for tuning the upper bound that swing modulo scheduler uses for scheduling a loop",

         100, 0, 0)

/* The minimum value of stage count that swing modulo scheduler will generate.  */

DEFPARAM(PARAM_SMS_MIN_SC,

        "sms-min-sc",

        "The minimum value of stage count that swing modulo scheduler will generate.",

        2, 1, 1)

DEFPARAM(PARAM_SMS_DFA_HISTORY,

         "sms-dfa-history",

         "The number of cycles the swing modulo scheduler considers when checking conflicts using DFA",

         0, 0, 0)

DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD,

         "sms-loop-average-count-threshold",

         "A threshold on the average loop count considered by the swing modulo scheduler",

         0, 0, 0)

DEFPARAM(HOT_BB_COUNT_FRACTION,

         "hot-bb-count-fraction",

         "Select fraction of the maximal count of repetitions of basic block in program given basic block needs to have to be considered hot",

         10000, 0, 0)

DEFPARAM(HOT_BB_FREQUENCY_FRACTION,

         "hot-bb-frequency-fraction",

         "Select fraction of the maximal frequency of executions of basic block in function given basic block needs to have to be considered hot",

         1000, 0, 0)

DEFPARAM (PARAM_ALIGN_THRESHOLD,

          "align-threshold",

          "Select fraction of the maximal frequency of executions of basic block in function given basic block get alignment",

          100, 0, 0)

DEFPARAM (PARAM_ALIGN_LOOP_ITERATIONS,

          "align-loop-iterations",

          "Loops iterating at least selected number of iterations will get loop alignement.",

          4, 0, 0)

/* For guessed profiles, the loops having unknown number of iterations

   are predicted to iterate relatively few (10) times at average.

   For functions containing one loop with large known number of iterations

   and other loops having unbounded loops we would end up predicting all

   the other loops cold that is not usually the case.  So we need to artificially

   flatten the profile.

   We need to cut the maximal predicted iterations to large enough iterations

   so the loop appears important, but safely within HOT_BB_COUNT_FRACTION

   range.  */

DEFPARAM(PARAM_MAX_PREDICTED_ITERATIONS,

         "max-predicted-iterations",

         "The maximum number of loop iterations we predict statically",

         100, 0, 0)

DEFPARAM(TRACER_DYNAMIC_COVERAGE_FEEDBACK,

         "tracer-dynamic-coverage-feedback",

         "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is available",

         95, 0, 100)

DEFPARAM(TRACER_DYNAMIC_COVERAGE,

         "tracer-dynamic-coverage",

         "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is not available",

         75, 0, 100)

DEFPARAM(TRACER_MAX_CODE_GROWTH,

         "tracer-max-code-growth",

         "Maximal code growth caused by tail duplication (in percent)",

         100, 0, 0)

DEFPARAM(TRACER_MIN_BRANCH_RATIO,

         "tracer-min-branch-ratio",

         "Stop reverse growth if the reverse probability of best edge is less than this threshold (in percent)",

         10, 0, 100)

DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY_FEEDBACK,

         "tracer-min-branch-probability-feedback",

         "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is available",

         80, 0, 100)

DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY,

         "tracer-min-branch-probability",

         "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is not available",

         50, 0, 100)

/* The maximum number of incoming edges to consider for crossjumping.  */

DEFPARAM(PARAM_MAX_CROSSJUMP_EDGES,

         "max-crossjump-edges",

         "The maximum number of incoming edges to consider for crossjumping",

         100, 0, 0)

/* The minimum number of matching instructions to consider for crossjumping.  */

DEFPARAM(PARAM_MIN_CROSSJUMP_INSNS,

     "min-crossjump-insns",

     "The minimum number of matching instructions to consider for crossjumping",

     5, 0, 0)

/* The maximum number expansion factor when copying basic blocks.  */

DEFPARAM(PARAM_MAX_GROW_COPY_BB_INSNS,

     "max-grow-copy-bb-insns",

     "The maximum expansion factor when copying basic blocks",

     8, 0, 0)

/* The maximum number of insns to duplicate when unfactoring computed gotos.  */

DEFPARAM(PARAM_MAX_GOTO_DUPLICATION_INSNS,

     "max-goto-duplication-insns",

     "The maximum number of insns to duplicate when unfactoring computed gotos",

     8, 0, 0)

/* The maximum length of path considered in cse.  */

DEFPARAM(PARAM_MAX_CSE_PATH_LENGTH,

         "max-cse-path-length",

         "The maximum length of path considered in cse",

         10, 0, 0)

DEFPARAM(PARAM_MAX_CSE_INSNS,

         "max-cse-insns",

         "The maximum instructions CSE process before flushing",

         1000, 0, 0)

/* The cost of expression in loop invariant motion that is considered

   expensive.  */

DEFPARAM(PARAM_LIM_EXPENSIVE,

         "lim-expensive",

         "The minimum cost of an expensive expression in the loop invariant motion",

         20, 0, 0)

/* Bound on number of candidates for induction variables below that

   all candidates are considered for each use in induction variable

   optimizations.  */

DEFPARAM(PARAM_IV_CONSIDER_ALL_CANDIDATES_BOUND,

         "iv-consider-all-candidates-bound",

         "Bound on number of candidates below that all candidates are considered in iv optimizations",

         30, 0, 0)

/* The induction variable optimizations give up on loops that contain more

   induction variable uses.  */

DEFPARAM(PARAM_IV_MAX_CONSIDERED_USES,

         "iv-max-considered-uses",

         "Bound on number of iv uses in loop optimized in iv optimizations",

         250, 0, 0)

/* If there are at most this number of ivs in the set, try removing unnecessary

   ivs from the set always.  */

DEFPARAM(PARAM_IV_ALWAYS_PRUNE_CAND_SET_BOUND,

         "iv-always-prune-cand-set-bound",

         "If number of candidates in the set is smaller, we always try to remove unused ivs during its optimization",

         10, 0, 0)

DEFPARAM(PARAM_SCEV_MAX_EXPR_SIZE,

         "scev-max-expr-size",

         "Bound on size of expressions used in the scalar evolutions analyzer",

         100, 0, 0)

DEFPARAM(PARAM_SCEV_MAX_EXPR_COMPLEXITY,

         "scev-max-expr-complexity",

         "Bound on the complexity of the expressions in the scalar evolutions analyzer",

         10, 0, 0)

DEFPARAM(PARAM_OMEGA_MAX_VARS,

         "omega-max-vars",

         "Bound on the number of variables in Omega constraint systems",

         128, 0, 0)

DEFPARAM(PARAM_OMEGA_MAX_GEQS,

         "omega-max-geqs",

         "Bound on the number of inequalities in Omega constraint systems",

         256, 0, 0)

DEFPARAM(PARAM_OMEGA_MAX_EQS,

         "omega-max-eqs",

         "Bound on the number of equalities in Omega constraint systems",

         128, 0, 0)

DEFPARAM(PARAM_OMEGA_MAX_WILD_CARDS,

         "omega-max-wild-cards",

         "Bound on the number of wild cards in Omega constraint systems",

         18, 0, 0)

DEFPARAM(PARAM_OMEGA_HASH_TABLE_SIZE,

         "omega-hash-table-size",

         "Bound on the size of the hash table in Omega constraint systems",

         550, 0, 0)

DEFPARAM(PARAM_OMEGA_MAX_KEYS,

         "omega-max-keys",

         "Bound on the number of keys in Omega constraint systems",

         500, 0, 0)

DEFPARAM(PARAM_OMEGA_ELIMINATE_REDUNDANT_CONSTRAINTS,

         "omega-eliminate-redundant-constraints",

         "When set to 1, use expensive methods to eliminate all redundant constraints",

         0, 0, 1)

DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS,

         "vect-max-version-for-alignment-checks",

         "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alignment check",

         6, 0, 0)

DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS,

         "vect-max-version-for-alias-checks",

         "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alias check",

         10, 0, 0)

DEFPARAM(PARAM_MAX_CSELIB_MEMORY_LOCATIONS,

         "max-cselib-memory-locations",

         "The maximum memory locations recorded by cselib",

         500, 0, 0)

#ifdef ENABLE_GC_ALWAYS_COLLECT

# define GGC_MIN_EXPAND_DEFAULT 0

# define GGC_MIN_HEAPSIZE_DEFAULT 0

#else

# define GGC_MIN_EXPAND_DEFAULT 30

# define GGC_MIN_HEAPSIZE_DEFAULT 4096

#endif

DEFPARAM(GGC_MIN_EXPAND,

         "ggc-min-expand",

         "Minimum heap expansion to trigger garbage collection, as a percentage of the total size of the heap",

         GGC_MIN_EXPAND_DEFAULT, 0, 0)

DEFPARAM(GGC_MIN_HEAPSIZE,

         "ggc-min-heapsize",

         "Minimum heap size before we start collecting garbage, in kilobytes",

         GGC_MIN_HEAPSIZE_DEFAULT, 0, 0)

#undef GGC_MIN_EXPAND_DEFAULT

#undef GGC_MIN_HEAPSIZE_DEFAULT

DEFPARAM(PARAM_MAX_RELOAD_SEARCH_INSNS,

         "max-reload-search-insns",

         "The maximum number of instructions to search backward when looking for equivalent reload",

         100, 0, 0)

DEFPARAM(PARAM_SINK_FREQUENCY_THRESHOLD,

         "sink-frequency-threshold",

         "Target block's relative execution frequency (as a percentage) required to sink a statement",

         75, 0, 100)

DEFPARAM(PARAM_MAX_SCHED_REGION_BLOCKS,

         "max-sched-region-blocks",

         "The maximum number of blocks in a region to be considered for interblock scheduling",

         10, 0, 0)

DEFPARAM(PARAM_MAX_SCHED_REGION_INSNS,

         "max-sched-region-insns",

         "The maximum number of insns in a region to be considered for interblock scheduling",

         100, 0, 0)

DEFPARAM(PARAM_MAX_PIPELINE_REGION_BLOCKS,

         "max-pipeline-region-blocks",

         "The maximum number of blocks in a region to be considered for interblock scheduling",

         15, 0, 0)

DEFPARAM(PARAM_MAX_PIPELINE_REGION_INSNS,

         "max-pipeline-region-insns",

         "The maximum number of insns in a region to be considered for interblock scheduling",

         200, 0, 0)

DEFPARAM(PARAM_MIN_SPEC_PROB,

         "min-spec-prob",

         "The minimum probability of reaching a source block for interblock speculative scheduling",

         40, 0, 0)

DEFPARAM(PARAM_MAX_SCHED_EXTEND_REGIONS_ITERS,

         "max-sched-extend-regions-iters",

         "The maximum number of iterations through CFG to extend regions",

         0, 0, 0)

DEFPARAM(PARAM_MAX_SCHED_INSN_CONFLICT_DELAY,

         "max-sched-insn-conflict-delay",

         "The maximum conflict delay for an insn to be considered for speculative motion",

         3, 1, 10)

DEFPARAM(PARAM_SCHED_SPEC_PROB_CUTOFF,

         "sched-spec-prob-cutoff",

         "The minimal probability of speculation success (in percents), so that speculative insn will be scheduled.",

         40, 0, 100)

DEFPARAM(PARAM_SELSCHED_MAX_LOOKAHEAD,

         "selsched-max-lookahead",

         "The maximum size of the lookahead window of selective scheduling",

         50, 0, 0)

DEFPARAM(PARAM_SELSCHED_MAX_SCHED_TIMES,

         "selsched-max-sched-times",

         "Maximum number of times that an insn could be scheduled",

         2, 0, 0)

DEFPARAM(PARAM_SELSCHED_INSNS_TO_RENAME,

         "selsched-insns-to-rename",

         "Maximum number of instructions in the ready list that are considered eligible for renaming",

         2, 0, 0)

DEFPARAM (PARAM_SCHED_MEM_TRUE_DEP_COST,

          "sched-mem-true-dep-cost",

          "Minimal distance between possibly conflicting store and load",

          1, 0, 0)

DEFPARAM(PARAM_MAX_LAST_VALUE_RTL,

         "max-last-value-rtl",

         "The maximum number of RTL nodes that can be recorded as combiner's last value",

         10000, 0, 0)

/* INTEGER_CST nodes are shared for values [{-1,0} .. N) for

   {signed,unsigned} integral types.  This determines N.

   Experimentation shows 256 to be a good value.  */

DEFPARAM (PARAM_INTEGER_SHARE_LIMIT,

          "integer-share-limit",

          "The upper bound for sharing integer constants",

          256, 2, 2)

/* Incremental SSA updates for virtual operands may be very slow if

   there is a large number of mappings to process.  In those cases, it

   is faster to rewrite the virtual symbols from scratch as if they

   had been recently introduced.  This heuristic cannot be applied to

   SSA mappings for real SSA names, only symbols kept in FUD chains.

   PARAM_MIN_VIRTUAL_MAPPINGS specifies the minimum number of virtual

   mappings that should be registered to trigger the heuristic.

   PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO specifies the ratio between

   mappings and symbols.  If the number of virtual mappings is

   PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO bigger than the number of

   virtual symbols to be updated, then the updater switches to a full

   update for those symbols.  */

DEFPARAM (PARAM_MIN_VIRTUAL_MAPPINGS,

          "min-virtual-mappings",

          "Minimum number of virtual mappings to consider switching to full virtual renames",

          100, 0, 0)

DEFPARAM (PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO,

          "virtual-mappings-ratio",

          "Ratio between virtual mappings and virtual symbols to do full virtual renames",

          3, 0, 0)

DEFPARAM (PARAM_SSP_BUFFER_SIZE,

          "ssp-buffer-size",

          "The lower bound for a buffer to be considered for stack smashing protection",

          8, 1, 0)

/* When we thread through a block we have to make copies of the

   statements within the block.  Clearly for large blocks the code

   duplication is bad.

   PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS specifies the maximum number

   of statements and PHI nodes allowed in a block which is going to

   be duplicated for thread jumping purposes.

   Some simple analysis showed that more than 99% of the jump

   threading opportunities are for blocks with less than 15

   statements.  So we can get the benefits of jump threading

   without excessive code bloat for pathological cases with the

   throttle set at 15 statements.  */

DEFPARAM (PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS,

          "max-jump-thread-duplication-stmts",

          "Maximum number of statements allowed in a block that needs to be duplicated when threading jumps",

          15, 0, 0)

/* This is the maximum number of fields a variable may have before the pointer analysis machinery

   will stop trying to treat it in a field-sensitive manner.

   There are programs out there with thousands of fields per structure, and handling them

   field-sensitively is not worth the cost.  */

DEFPARAM (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,

          "max-fields-for-field-sensitive",

          "Maximum number of fields in a structure before pointer analysis treats the structure as a single variable",

          0, 0, 0)

DEFPARAM(PARAM_MAX_SCHED_READY_INSNS,

         "max-sched-ready-insns",

         "The maximum number of instructions ready to be issued to be considered by the scheduler during the first scheduling pass",

         100, 0, 0)

/* This is the maximum number of active local stores RTL DSE will consider.  */

DEFPARAM (PARAM_MAX_DSE_ACTIVE_LOCAL_STORES,

          "max-dse-active-local-stores",

          "Maximum number of active local stores in RTL dead store elimination",

          5000, 0, 0)

/* Prefetching and cache-optimizations related parameters.  Default values are

   usually set by machine description.  */

/* The number of insns executed before prefetch is completed.  */

DEFPARAM (PARAM_PREFETCH_LATENCY,

         "prefetch-latency",

         "The number of insns executed before prefetch is completed",

         200, 0, 0)

/* The number of prefetches that can run at the same time.  */

DEFPARAM (PARAM_SIMULTANEOUS_PREFETCHES,

          "simultaneous-prefetches",

          "The number of prefetches that can run at the same time",

          3, 0, 0)

/* The size of L1 cache in kB.  */

DEFPARAM (PARAM_L1_CACHE_SIZE,

          "l1-cache-size",

          "The size of L1 cache",

          64, 0, 0)

/* The size of L1 cache line in bytes.  */

DEFPARAM (PARAM_L1_CACHE_LINE_SIZE,

          "l1-cache-line-size",

          "The size of L1 cache line",

          32, 0, 0)

/* The size of L2 cache in kB.  */

DEFPARAM (PARAM_L2_CACHE_SIZE,

          "l2-cache-size",

          "The size of L2 cache",

          512, 0, 0)

/* Whether we should use canonical types rather than deep "structural"

   type checking.  Setting this value to 1 (the default) improves

   compilation performance in the C++ and Objective-C++ front end;

   this value should only be set to zero to work around bugs in the

   canonical type system by disabling it.  */

DEFPARAM (PARAM_USE_CANONICAL_TYPES,

          "use-canonical-types",

          "Whether to use canonical types",

          1, 0, 1)

DEFPARAM (PARAM_MAX_PARTIAL_ANTIC_LENGTH,

          "max-partial-antic-length",

          "Maximum length of partial antic set when performing tree pre optimization",

          100, 0, 0)

/* The following is used as a stop-gap limit for cases where really huge

   SCCs blow up memory and compile-time use too much.  If we hit this limit,

   SCCVN and such FRE and PRE will be not done at all for the current

   function.  */

DEFPARAM (PARAM_SCCVN_MAX_SCC_SIZE,

          "sccvn-max-scc-size",

          "Maximum size of a SCC before SCCVN stops processing a function",

          10000, 10, 0)

DEFPARAM (PARAM_IRA_MAX_LOOPS_NUM,

          "ira-max-loops-num",

          "Max loops number for regional RA",

          100, 0, 0)

DEFPARAM (PARAM_IRA_MAX_CONFLICT_TABLE_SIZE,

          "ira-max-conflict-table-size",

          "Max size of conflict table in MB",

          1000, 0, 0)

DEFPARAM (PARAM_IRA_LOOP_RESERVED_REGS,

          "ira-loop-reserved-regs",

          "The number of registers in each class kept unused by loop invariant motion",

          2, 0, 0)

/* Switch initialization conversion will refuse to create arrays that are

   bigger than this parameter times the number of switch branches.  */

DEFPARAM (PARAM_SWITCH_CONVERSION_BRANCH_RATIO,

          "switch-conversion-max-branch-ratio",

          "The maximum ratio between array size and switch branches for "

          "a switch conversion to take place",

          8, 1, 0)

/* Size of tiles when doing loop blocking.  */

DEFPARAM (PARAM_LOOP_BLOCK_TILE_SIZE,

          "loop-block-tile-size",

          "size of tiles for loop blocking",

          51, 0, 0)

/* Maximal number of parameters that we allow in a SCoP.  */

DEFPARAM (PARAM_GRAPHITE_MAX_NB_SCOP_PARAMS,

          "graphite-max-nb-scop-params",

          "maximum number of parameters in a SCoP",

          10, 0, 0)

/* Maximal number of basic blocks in the functions analyzed by Graphite.  */

DEFPARAM (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION,

          "graphite-max-bbs-per-function",

          "maximum number of basic blocks per function to be analyzed by Graphite",

          100, 0, 0)

/* Avoid data dependence analysis on very large loops.  */

DEFPARAM (PARAM_LOOP_MAX_DATAREFS_FOR_DATADEPS,

          "loop-max-datarefs-for-datadeps",

          "Maximum number of datarefs in loop for building loop data dependencies",

          1000, 0, 0)

/* Avoid doing loop invariant motion on very large loops.  */

DEFPARAM (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,

          "loop-invariant-max-bbs-in-loop",

          "Max basic blocks number in loop for loop invariant motion",

          10000, 0, 0)

/* Avoid SLP vectorization of large basic blocks.  */

DEFPARAM (PARAM_SLP_MAX_INSNS_IN_BB,

          "slp-max-insns-in-bb",

          "Maximum number of instructions in basic block to be considered for SLP vectorization",

          1000, 0, 0)

DEFPARAM (PARAM_MIN_INSN_TO_PREFETCH_RATIO,

          "min-insn-to-prefetch-ratio",

          "Min. ratio of insns to prefetches to enable prefetching for "

          "a loop with an unknown trip count",

          9, 0, 0)

DEFPARAM (PARAM_PREFETCH_MIN_INSN_TO_MEM_RATIO,

          "prefetch-min-insn-to-mem-ratio",

          "Min. ratio of insns to mem ops to enable prefetching in a loop",

          3, 0, 0)

/* Set maximum hash table size for var tracking.  */

DEFPARAM (PARAM_MAX_VARTRACK_SIZE,

          "max-vartrack-size",

          "Max. size of var tracking hash tables",

          50000000, 0, 0)

/* Set maximum recursion depth for var tracking expression expansion

   and resolution.  */

DEFPARAM (PARAM_MAX_VARTRACK_EXPR_DEPTH,

          "max-vartrack-expr-depth",

          "Max. recursion depth for expanding var tracking expressions",

          12, 0, 0)

/* Set minimum insn uid for non-debug insns.  */

DEFPARAM (PARAM_MIN_NONDEBUG_INSN_UID,

          "min-nondebug-insn-uid",

          "The minimum UID to be used for a nondebug insn",

          0, 1, 0)

DEFPARAM (PARAM_IPA_SRA_PTR_GROWTH_FACTOR,

          "ipa-sra-ptr-growth-factor",

          "Maximum allowed growth of size of new parameters ipa-sra replaces "

          "a pointer to an aggregate with",

          2, 0, 0)

DEFPARAM (PARAM_TM_MAX_AGGREGATE_SIZE,

          "tm-max-aggregate-size",

          "Size in bytes after which thread-local aggregates should be "

          "instrumented with the logging functions instead of save/restore "

          "pairs",

          9, 0, 0)

DEFPARAM (PARAM_IPA_CP_VALUE_LIST_SIZE,

          "ipa-cp-value-list-size",

          "Maximum size of a list of values associated with each parameter for "

          "interprocedural constant propagation",

          8, 0, 0)

DEFPARAM (PARAM_IPA_CP_EVAL_THRESHOLD,

          "ipa-cp-eval-threshold",

          "Threshold ipa-cp opportunity evaluation that is still considered "

          "beneficial to clone.",

          500, 0, 0)

/* WHOPR partitioning configuration.  */

DEFPARAM (PARAM_LTO_PARTITIONS,

          "lto-partitions",

          "Number of partitions the program should be split to",

          32, 1, 0)

DEFPARAM (MIN_PARTITION_SIZE,

          "lto-min-partition",

          "Minimal size of a partition for LTO (in estimated instructions)",

          1000, 0, 0)

/* Diagnostic parameters.  */

DEFPARAM (CXX_MAX_NAMESPACES_FOR_DIAGNOSTIC_HELP,

          "cxx-max-namespaces-for-diagnostic-help",

          "Maximum number of namespaces to search for alternatives when "

          "name lookup fails",

          1000, 0, 0)

/* Maximum number of conditional store pairs that can be sunk.  */

DEFPARAM (PARAM_MAX_STORES_TO_SINK,

          "max-stores-to-sink",

          "Maximum number of conditional store pairs that can be sunk",

          2, 0, 0)

/* Override CASE_VALUES_THRESHOLD of when to switch from doing switch

   statements via if statements to using a table jump operation.  If the value

   is 0, the default CASE_VALUES_THRESHOLD will be used.  */

DEFPARAM (PARAM_CASE_VALUES_THRESHOLD,

          "case-values-threshold",

          "The smallest number of different values for which it is best to "

          "use a jump-table instead of a tree of conditional branches, "

          "if 0, use the default for the machine",

          0, 0, 0)

/* Data race flags for C++0x memory model compliance.  */

DEFPARAM (PARAM_ALLOW_LOAD_DATA_RACES,

          "allow-load-data-races",

          "Allow new data races on loads to be introduced",