| /* params.def - Run-time parameters. |
| Copyright (C) 2001-2013 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) |
| |
| DEFPARAM (PARAM_INLINE_FUNCTION_OVERHEAD_SIZE, |
| "inline-function-overhead-size", |
| "Size estimate of function overhead (prologue/epilogue) for inlining purposes", |
| 7, 0, 0) |
| |
| /* Knob to control hot-caller heuristic. 0 means it is turned off, 1 means |
| it is always applied, and 2 means it is applied only if the footprint is |
| smaller than PARAM_HOT_CALLER_CODESIZE_THRESHOLD. */ |
| DEFPARAM (PARAM_INLINE_HOT_CALLER, |
| "inline-hot-caller", |
| "Consider cold callsites for inlining if caller contains hot code", |
| 2, 0, 2) |
| |
| /* The maximum code size estimate under which hot caller heuristic is |
| applied. */ |
| DEFPARAM(PARAM_HOT_CALLER_CODESIZE_THRESHOLD, |
| "hot-caller-codesize-threshold", |
| "Maximum profile-based code size footprint estimate for " |
| "hot caller heuristic ", |
| 10000, 0, 0) |
| |
| DEFPARAM (PARAM_INLINE_USEFUL_COLD_CALLEE, |
| "inline-useful-cold-callee", |
| "Only consider cold callsites for inlining if analysis estimates " |
| "downstream optimization opportunities", |
| 1, 0, 1) |
| |
| /* 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_EARLY_INLINING_INSNS_ANY, |
| "early-inlining-insns-any", |
| "Early inline calls if growth does not exceed this limit", |
| 0, 0, 0) |
| DEFPARAM(PARAM_EARLY_INLINING_INSNS_COMDAT, |
| "early-inlining-insns-comdat", |
| "Early inline calls to comdate functions if growth does not exceed this limit", |
| 15, 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 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", |
| 400, 0, 0) |
| /* The default maximum number of insns of a peeled loop, with -O2. */ |
| DEFPARAM(PARAM_MAX_DEFAULT_COMPLETELY_PEELED_INSNS, |
| "max-default-completely-peeled-insns", |
| "The maximum number of insns of a completely peeled loop", |
| 200, 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 code size estimate under which loop unrolling and peeling |
| * is allowed in a profile feedback compile. This currently applies to loops |
| * with non-constant iteration counts and no floating point computations. */ |
| DEFPARAM(PARAM_UNROLLPEEL_CODESIZE_THRESHOLD, |
| "unrollpeel-codesize-threshold", |
| "Maximum profile-based code size footprint estimate for loop unrolling " |
| "and peeling", |
| 15000, 0, 0) |
| /* The maximum ratio of total profiled execution counts to loop entry block |
| count that must be exceeded to ignore most code size limits when unrolling |
| and peeling. */ |
| DEFPARAM(PARAM_UNROLLPEEL_HOTNESS_THRESHOLD, |
| "unrollpeel-hotness-threshold", |
| "Maximum ratio of total profiled execution count to loop entry " |
| "block count under which most codesize limits for unrolling and " |
| "peeling will be ignored", |
| 100, 1, 0) |
| |
| DEFPARAM(PARAM_MIN_ITER_UNROLL_WITH_BRANCHES, |
| "min-iter-unroll-with-branches", |
| "Minimum iteration count to ignore branch effects when unrolling", |
| 50, 0, 0) |
| DEFPARAM(PARAM_UNROLL_OUTER_LOOP_BRANCH_BUDGET, |
| "unroll-outer-loop-branch-budget", |
| "Maximum number of branches allowed in hot outer loop region after unroll", |
| 25, 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 maximum iterations that AutoFDO profile |
| prpagation algorithm will run for a specific CFG. */ |
| |
| DEFPARAM(PARAM_AUTOFDO_MAX_PROPAGATE_ITERATIONS, |
| "max-autofdo-max-propagate-iterations", |
| "The maximum number of AutoFDO profile propagation iterations", |
| 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) |
| |
| /* 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) |
| |
| /* 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) |
| |
| /* Promote indirect call to conditional direct call only |
| when the percentage of the target count over the total |
| indirect call count is no smaller than the threshold. */ |
| DEFPARAM (PARAM_ICALL_PROMOTE_PERCENT_THRESHOLD, |
| "icall-promote-target-percent-threshold", |
| "percentage threshold for direct call promotion" |
| " of a callee target", |
| 33, 0, 100) |
| |
| DEFPARAM (PARAM_ICALL_PROMOTE_COUNT_THRESHOLD, |
| "icall-promote-target_count-threshold", |
| "call count threshold for direct call promotion" |
| " of a callee target", |
| 1, 0, 0) |
| |
| /* 0: do not always inline icall target: |
| other value: always inline icall target when call count |
| exceeds this value. |
| */ |
| DEFPARAM (PARAM_ALWAYS_INLINE_ICALL_TARGET, |
| "always-inline-icall-target", |
| "force inline indirect call target when promoted", |
| 0, 0, 0) |
| |
| /* Do not check the icall target count distribution, but use |
| hotness info to decide if promotion should be done. */ |
| DEFPARAM (PARAM_ICALL_USE_HOTNESS_HEUR, |
| "icall-use-hotness-heur", |
| "use hotness based heuristics to match inliner", |
| 0, 0, 0) |
| |
| /* Force the compiler to be in LIPO mode even there is no |
| profile data available. -fripa is also needed. */ |
| DEFPARAM (PARAM_FORCE_LIPO_MODE, |
| "force-lipo", |
| "force LIPO compilation mode", |
| 0, 0, 1) |
| |
| /* Limit max module group size in LIPO mode. When the value |
| is set to 0 (which is the default), there is no limit. */ |
| DEFPARAM (PARAM_MAX_LIPO_GROUP, |
| "max-lipo-group", |
| "maximum module group size.", |
| 0, 0, 10000) |
| |
| /* In LIPO mode, stop processing any further auxiliary modules |
| if current memory consumption exceeds this limit (in kb). */ |
| DEFPARAM (PARAM_MAX_LIPO_MEMORY, |
| "max-lipo-mem", |
| "don't import aux files if memory consumption exceeds this value", |
| 4000000, 0, 0) |
| |
| /* In LIPO profile-gen, use this parameter to record the cutoff value used at |
| profile collection runtime. */ |
| DEFPARAM (PARAM_LIPO_CUTOFF, |
| "lipo-cutoff", |
| "The cutoff value of cumulative profile count. The value is between" |
| "0-99. 100 is reserved as a special value indicating default cutoff" |
| "which is set at runtime. When the parameter is used and if its value" |
| "is not 100, it overrides the dafault as well as the value set by the" |
| " enviornment variable", |
| 100, 0, 100) |
| |
| /* In LIPO profile-gen, use this parameter to limit IPA inline. */ |
| DEFPARAM (PARAM_LIPO_SKIP_SPECIAL_SECTIONS, |
| "lipo-skip-special-sections", |
| "In LIPO profile gen compilation, do not generate direct call " |
| "profiling to functions marked with __attribute__((section(...))" |
| "Those functions can not be inlined so there is no point tracking" |
| "them.", |
| 1, 0, 1) |
| |
| /* In LIPO profile-gen, use this parameter to set random group generation |
| seed value. */ |
| DEFPARAM (PARAM_LIPO_RANDOM_SEED, |
| "lipo-random-seed", |
| "random seed value used in random group testing", |
| 0, 0, 0) |
| |
| /* In LIPO profile-gen, use this parmaeter to set random group max size at profile |
| collection runtime. */ |
| DEFPARAM (PARAM_LIPO_RANDOM_GROUP_SIZE, |
| "lipo-random-group-size", |
| "In LIPO random group testing, this parameter is used to set max group" |
| " size. The default value is 0 which is treated specially and specifies" |
| " no random grouping.", |
| 0, 0, 300) |
| |
| /* In LIPO profile-gen, use this parameter to specify the scale factor to propagate |
| callee module groups to caller. */ |
| DEFPARAM (PARAM_LIPO_PROPAGATE_SCALE, |
| "lipo-propagate-scale", |
| "The scale factor to propagate callee module group's weight to the caller.", |
| 100, 0, 100) |
| |
| /* Choose different module grouping algorithms. This only affects |
| LIPO profile-gen. */ |
| DEFPARAM (PARAM_LIPO_GROUPING_ALGORITHM, |
| "lipo-grouping-algorithm", |
| "Algorithm 0 uses the eager propagation algorithm." |
| "Algorithm 1 uses the inclusion_based priority algorithm." |
| "The default algorithm is 1.", |
| 1, 0, 1) |
| |
| /* In the inclusion_based_priority grouping algorithm, specify if we combine the |
| the edges b/w modules. */ |
| DEFPARAM (PARAM_LIPO_MERGE_MODU_EDGES, |
| "lipo-merge-modu-edges", |
| "Default is 0 which not merge." |
| "If the value is 1, merge the edges.", |
| 0, 0, 1) |
| |
| /* In the inclusion_based_priority grouping algorithm, specify if we force |
| strict inclusion of modules. */ |
| DEFPARAM (PARAM_LIPO_WEAK_INCLUSION, |
| "lipo-weak-inclusion", |
| "0: force strict inclusion; 1: weak inclusion." |
| "Default is 0.", |
| 0, 0, 1) |
| |
| /* In LIPO profile-use, use this parameter to enable the dumping of module id |
| in inline message. */ |
| DEFPARAM (PARAM_INLINE_DUMP_MODULE_ID, |
| "inline-dump-module-id", |
| "Default is 1. If the value is 0, dumping is disabled.", |
| 1, 0, 1) |
| |
| /* In LIPO profile-gen, use this parameter to enable cgraph dumping. */ |
| DEFPARAM (PARAM_LIPO_DUMP_CGRAPH, |
| "lipo-dump-cgraph", |
| "Default is 0. If the value is 1, text dump is used. If the value " |
| "is 2, .dot dump is enabled. ", |
| 0, 0, 2) |
| |
| DEFPARAM (PARAM_PROFILE_GENERATE_SAMPLING_PERIOD, |
| "profile-generate-sampling-period", |
| "sampling rate with -fprofile-generate-sampling", |
| 100, 0, 2000000000) |
| |
| DEFPARAM (PARAM_COVERAGE_CALLBACK, |
| "coverage-callback", |
| "callback a user-define function when for arc counter increments.", |
| 0, 0, 1) |
| |
| DEFPARAM (PARAM_COVERAGE_EXEC_ONCE, |
| "coverage-exec_once", |
| "Stop incrementing arc counts once they become 1.", |
| 0, 0, 1) |
| |
| /* Used for debugging purpose. Tell the compiler to find |
| the gcda file in the current directory. */ |
| DEFPARAM (PARAM_GCOV_DEBUG, |
| "gcov-debug", |
| "Looking for gcda file in current dir.", |
| 0, 0, 1) |
| |
| /* 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) |
| |
| /* 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) |
| |
| DEFPARAM (PARAM_MIN_MCF_CANCEL_ITERS, |
| "min-mcf-cancel-iters", |
| "the minimum number of iterations of negative cycle cancellation " |
| "in MCF", |
| 10, 1, 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) |
| |
| |
| /* Only output those call graph edges in .gnu.callgraph.text sections |
| whose count is greater than this value. */ |
| DEFPARAM (PARAM_GNU_CGRAPH_SECTION_EDGE_THRESHOLD, |
| "gnu-cgraph-section-edge-threshold", |
| "minimum call graph edge count for inclusion in " |
| ".gnu.callgraph.text section", |
| 0, 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) |
| |
| /* Parameters to be used with -mpatch-functions-for-instrumentation. |
| See config/i386/i386.opt */ |
| DEFPARAM (PARAM_FUNCTION_PATCH_MIN_INSTRUCTIONS, |
| "function-patch-min-instructions", |
| "Minimum number of instructions in the function without loop before " |
| "the function is qualified for patching for instrumentation (for use " |
| "with -mpatch-functions-for-instrumentation)", |
| 200, 0, 0) |
| |
| /* Static predefined average loop iteration num used in IVOPT. */ |
| DEFPARAM (PARAM_IVOPT_AVG_LOOP_NITER, |
| "ivopt-avg-loop-niter", |
| "Static predefined average loop iteration num used in IVOPT, it is " |
| "used when loop iterations number estimation return -1", |
| 50, 0, 0) |
| |
| 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: |
| */ |