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author | Ben Cheng <bccheng@google.com> | 2014-03-26 05:37:19 (GMT) |
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committer | Ben Cheng <bccheng@google.com> | 2014-03-26 05:37:19 (GMT) |

commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |

tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/params.def | |

parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |

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Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

Diffstat (limited to 'gcc-4.9/gcc/params.def')

-rw-r--r-- | gcc-4.9/gcc/params.def | 1097 |

1 files changed, 1097 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/params.def b/gcc-4.9/gcc/params.def new file mode 100644 index 0000000..dd2e2cd --- /dev/null +++ b/gcc-4.9/gcc/params.def @@ -0,0 +1,1097 @@ +/* params.def - Run-time parameters. + Copyright (C) 2001-2014 Free Software Foundation, Inc. + Written by Mark Mitchell <mark@codesourcery.com>. + +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 +<http://www.gnu.org/licenses/>. */ + +/* 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 <name>=<value>'. + + - 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) + +DEFPARAM (PARAM_INLINE_MIN_SPEEDUP, + "inline-min-speedup", + "The minimal estimated speedup allowing inliner to ignore inline-insns-single and inline-isnsns-auto", + 10, 0, 0) + +/* 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", + 1, 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", + 100, 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 peelings of a single loop that is peeled completely. */ +DEFPARAM(PARAM_MAX_PEEL_BRANCHES, + "max-peel-branches", + "The maximum number of branches on the path through the peeled sequence", + 32, 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", + 100, 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_WS_PERMILLE, + "hot-bb-count-ws-permille", + "A basic block profile count is considered hot if it contributes to " + "the given permillage of the entire profiled execution", + 999, 0, 1000) +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(UNLIKELY_BB_COUNT_FRACTION, + "unlikely-bb-count-fraction", + "The minimum fraction of profile runs a given basic block execution count must be not to be considered unlikely", + 20, 1, 10000) + +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, 1, 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 maximum hotness + range. */ + +DEFPARAM(PARAM_MAX_PREDICTED_ITERATIONS, + "max-predicted-iterations", + "The maximum number of loop iterations we predict statically", + 100, 0, 0) + +/* This parameter controls the probability of builtin_expect. The default + value is 90%. This empirical value is obtained through the weighted + probability of FDO counters (with the FDO count value as the weight) + in some real world programs: + (1) Google performance test benchmarks: the probability is 0.9081. + (2) Linux 3.3 kernel running Google search workload: the probability + is 0.8717. */ + +DEFPARAM(BUILTIN_EXPECT_PROBABILITY, + "builtin-expect-probability", + "Set the estimated probability in percentage for builtin expect. The default value is 90% probability.", + 90, 0, 100) +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, 1, 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, 1, 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_VECT_MAX_PEELING_FOR_ALIGNMENT, + "vect-max-peeling-for-alignment", + "Max number of loop peels to enhancement alignment of data references in a loop", + -1, -1, 64) + +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_SCHED_STATE_EDGE_PROB_CUTOFF, + "sched-state-edge-prob-cutoff", + "The minimum probability an edge must have for the scheduler to save its state across it.", + 10, 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 251 to be a good value that generates the + least amount of garbage for allocating the TREE_VEC storage. */ +DEFPARAM (PARAM_INTEGER_SHARE_LIMIT, + "integer-share-limit", + "The upper bound for sharing integer constants", + 251, 2, 2) + +DEFPARAM (PARAM_SSP_BUFFER_SIZE, + "ssp-buffer-size", + "The lower bound for a buffer to be considered for stack smashing protection", + 8, 1, 0) + +DEFPARAM (PARAM_MIN_SIZE_FOR_STACK_SHARING, + "min-size-for-stack-sharing", + "The minimum size of variables taking part in stack slot sharing " + "when not optimizing", + 32, 0, 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) + +/* The following is used as a stop-gap limit for cases where really huge + functions blow up compile-time use too much. It limits the number of + alias-queries we do for finding common subexpressions for memory loads and + stores. The number of alias-queries is otherwise limited by the number of + stores on paths to function entry. */ + +DEFPARAM (PARAM_SCCVN_MAX_ALIAS_QUERIES_PER_ACCESS, + "sccvn-max-alias-queries-per-access", + "Maximum number of disambiguations to perform per memory access", + 1000, 0, 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) + +DEFPARAM (PARAM_LRA_MAX_CONSIDERED_RELOAD_PSEUDOS, + "lra-max-considered-reload-pseudos", + "The max number of reload pseudos which are considered during spilling a non-reload pseudo", + 500, 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 maximum length of value location list for which var tracking + should add reverse operations. */ + +DEFPARAM (PARAM_MAX_VARTRACK_REVERSE_OP_SIZE, + "max-vartrack-reverse-op-size", + "Max. size of loc list for which reverse ops should be added", + 50, 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) + +DEFPARAM (PARAM_IPA_MAX_AGG_ITEMS, + "ipa-max-agg-items", + "Maximum number of aggregate content items for a parameter in " + "jump functions and lattices", + 16, 0, 0) + +DEFPARAM (PARAM_IPA_CP_LOOP_HINT_BONUS, + "ipa-cp-loop-hint-bonus", + "Compile-time bonus IPA-CP assigns to candidates which make loop " + "bounds or strides known.", + 64, 0, 0) + +DEFPARAM (PARAM_IPA_CP_ARRAY_INDEX_HINT_BONUS, + "ipa-cp-array-index-hint-bonus", + "Compile-time bonus IPA-CP assigns to candidates which make an array " + "index known.", + 48, 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", + 1, 0, 1) + +DEFPARAM (PARAM_ALLOW_STORE_DATA_RACES, + "allow-store-data-races", + "Allow new data races on stores to be introduced", + 1, 0, 1) + +DEFPARAM (PARAM_ALLOW_PACKED_LOAD_DATA_RACES, + "allow-packed-load-data-races", + "Allow new data races on packed data loads to be introduced", + 1, 0, 1) + +DEFPARAM (PARAM_ALLOW_PACKED_STORE_DATA_RACES, + "allow-packed-store-data-races", + "Allow new data races on packed data stores to be introduced", + 1, 0, 1) + +/* Reassociation width to be used by tree reassoc optimization. */ +DEFPARAM (PARAM_TREE_REASSOC_WIDTH, + "tree-reassoc-width", + "Set the maximum number of instructions executed in parallel in " + "reassociated tree. If 0, use the target dependent heuristic.", + 0, 0, 0) + +DEFPARAM (PARAM_MAX_TAIL_MERGE_COMPARISONS, + "max-tail-merge-comparisons", + "Maximum amount of similar bbs to compare a bb with", + 10, 0, 0) + +DEFPARAM (PARAM_MAX_TAIL_MERGE_ITERATIONS, + "max-tail-merge-iterations", + "Maximum amount of iterations of the pass over a function", + 2, 0, 0) + +/* Maximum number of strings for which strlen optimization pass will + track string lenths. */ +DEFPARAM (PARAM_MAX_TRACKED_STRLENS, + "max-tracked-strlens", + "Maximum number of strings for which strlen optimization pass will " + "track string lengths", + 1000, 0, 0) + +/* Keep this in sync with the sched_pressure_algorithm enum. */ +DEFPARAM (PARAM_SCHED_PRESSURE_ALGORITHM, + "sched-pressure-algorithm", + "Which -fsched-pressure algorithm to apply", + 1, 1, 2) + +/* Maximum length of candidate scans in straight-line strength reduction. */ +DEFPARAM (PARAM_MAX_SLSR_CANDIDATE_SCAN, + "max-slsr-cand-scan", + "Maximum length of candidate scans for straight-line " + "strength reduction", + 50, 1, 999999) + +DEFPARAM (PARAM_ASAN_STACK, + "asan-stack", + "Enable asan stack protection", + 1, 0, 1) + +DEFPARAM (PARAM_ASAN_GLOBALS, + "asan-globals", + "Enable asan globals protection", + 1, 0, 1) + +DEFPARAM (PARAM_ASAN_INSTRUMENT_WRITES, + "asan-instrument-writes", + "Enable asan store operations protection", + 1, 0, 1) + +DEFPARAM (PARAM_ASAN_INSTRUMENT_READS, + "asan-instrument-reads", + "Enable asan load operations protection", + 1, 0, 1) + +DEFPARAM (PARAM_ASAN_MEMINTRIN, + "asan-memintrin", + "Enable asan builtin functions protection", + 1, 0, 1) + +DEFPARAM (PARAM_ASAN_USE_AFTER_RETURN, + "asan-use-after-return", + "Enable asan builtin functions protection", + 1, 0, 1) + +DEFPARAM (PARAM_UNINIT_CONTROL_DEP_ATTEMPTS, + "uninit-control-dep-attempts", + "Maximum number of nested calls to search for control dependencies " + "during uninitialized variable analysis", + 1000, 1, 0) +/* + +Local variables: +mode:c +End: +*/ |