| /* params.def - Run-time parameters. |
| Copyright (C) 2001-2019 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). |
| |
| The DEFPARAMENUM<N> macro is similar, but instead of the minumum and maximum |
| arguments, it contains a list of <N> allowed strings, corresponding to |
| integer values 0..<N>-1. Note that the default argument needs to be |
| specified as one of the allowed strings, rather than an integer value. |
| |
| 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-insns-auto.", |
| 15, 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. |
| 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.", |
| 200, 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 30. */ |
| DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO, |
| "max-inline-insns-auto", |
| "The maximum number of instructions when automatically inlining.", |
| 30, 0, 0) |
| |
| DEFPARAM (PARAM_MAX_INLINE_INSNS_SMALL, |
| "max-inline-insns-small", |
| "The maximum number of instructions when automatically inlining small functions.", |
| 0, 0, 0) |
| |
| DEFPARAM (PARAM_MAX_INLINE_INSNS_SIZE, |
| "max-inline-insns-size", |
| "The maximum number of instructions when inlining for size.", |
| 0, 0, 0) |
| |
| DEFPARAM (PARAM_UNINLINED_FUNCTION_INSNS, |
| "uninlined-function-insns", |
| "Instruction accounted for function prologue, epilogue and other" |
| " overhead.", |
| 2, 0, 1000000) |
| |
| DEFPARAM (PARAM_UNINLINED_FUNCTION_TIME, |
| "uninlined-function-time", |
| "Time accounted for function prologue, epilogue and other" |
| " overhead.", |
| 0, 0, 1000000) |
| |
| DEFPARAM (PARAM_UNINLINED_FUNCTION_THUNK_INSNS, |
| "uninlined-thunk-insns", |
| "Instruction accounted for function thunk overhead.", |
| 2, 0, 1000000) |
| |
| DEFPARAM (PARAM_UNINLINED_FUNCTION_THUNK_TIME, |
| "uninlined-thunk-time", |
| "Time accounted for function thunk overhead.", |
| 2, 0, 1000000) |
| |
| 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, 100) |
| |
| /* 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.", |
| 0, 0, 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).", |
| 40, 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.", |
| 14, 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) |
| |
| /* Keep these up to date with those in configure.ac. */ |
| DEFPARAM(PARAM_STACK_CLASH_PROTECTION_GUARD_SIZE, |
| "stack-clash-protection-guard-size", |
| "Size of the stack guard expressed as a power of two in bytes.", |
| 12, 12, 30) |
| |
| DEFPARAM(PARAM_STACK_CLASH_PROTECTION_PROBE_INTERVAL, |
| "stack-clash-protection-probe-interval", |
| "Interval in which to probe the stack expressed as a power of two in bytes.", |
| 12, 10, 16) |
| |
| /* 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.", |
| 128 * 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) |
| |
| |
| /* When synthesizing expnonentiation by a real constant operations using square |
| roots, this controls how deep sqrt chains we are willing to generate. */ |
| DEFPARAM(PARAM_MAX_POW_SQRT_DEPTH, |
| "max-pow-sqrt-depth", |
| "Maximum depth of sqrt chains to use when synthesizing exponentiation by a real constant.", |
| 5, 1, 32) |
| |
| /* 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.", |
| 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 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 insns in loop header duplicated by the copy loop |
| headers pass. */ |
| DEFPARAM(PARAM_MAX_LOOP_HEADER_INSNS, |
| "max-loop-header-insns", |
| "The maximum number of insns in loop header duplicated by the copy loop headers pass.", |
| 20, 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, 16) |
| DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD, |
| "sms-loop-average-count-threshold", |
| "A threshold on the average loop count considered by the swing modulo scheduler.", |
| 0, 0, 0) |
| |
| DEFPARAM(HOT_BB_COUNT_FRACTION, |
| "hot-bb-count-fraction", |
| "Select fraction of the maximal count of repetitions of basic block in program given basic " |
| "block needs to have to be considered hot (used in non-LTO mode).", |
| 10000, 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 (used in LTO mode).", |
| 990, 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 alignment.", 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(BUILTIN_STRING_CMP_INLINE_LENGTH, |
| "builtin-string-cmp-inline-length", |
| "The maximum length of a constant string for a builtin string cmp call eligible for inlining. The default value is 3.", |
| 3, 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.", |
| 40, 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_AVG_LOOP_NITER, |
| "avg-loop-niter", |
| "Average number of iterations of a loop.", |
| 10, 1, 0) |
| |
| DEFPARAM(PARAM_DSE_MAX_OBJECT_SIZE, |
| "dse-max-object-size", |
| "Maximum size (in bytes) of objects tracked bytewise by dead store elimination.", |
| 256, 0, 0) |
| |
| DEFPARAM(PARAM_DSE_MAX_ALIAS_QUERIES_PER_STORE, |
| "dse-max-alias-queries-per-store", |
| "Maximum number of queries into the alias oracle per store.", |
| 256, 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_MAX_TREE_IF_CONVERSION_PHI_ARGS, |
| "max-tree-if-conversion-phi-args", |
| "Maximum number of arguments in a PHI supported by TREE if-conversion " |
| "unless the loop is marked with simd pragma.", |
| 4, 2, 0) |
| |
| 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", |
| "Maximum number of loop peels to enhance 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, 1, 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_SCHED_AUTOPREF_QUEUE_DEPTH, |
| "sched-autopref-queue-depth", |
| "Hardware autoprefetcher scheduler model control flag. Number of lookahead cycles the model looks into; at '0' only enable instruction sorting heuristic. Disabled by default.", |
| -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) |
| |
| DEFPARAM(PARAM_MAX_COMBINE_INSNS, |
| "max-combine-insns", |
| "The maximum number of insns combine tries to combine.", |
| 4, 2, 4) |
| |
| /* 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, 1, 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 software prefetch hints should be issued for non-constant |
| strides. */ |
| |
| DEFPARAM (PARAM_PREFETCH_DYNAMIC_STRIDES, |
| "prefetch-dynamic-strides", |
| "Whether software prefetch hints should be issued for non-constant " |
| "strides.", |
| 1, 0, 1) |
| |
| /* The minimum constant stride beyond which we should use prefetch hints |
| for. */ |
| |
| DEFPARAM (PARAM_PREFETCH_MINIMUM_STRIDE, |
| "prefetch-minimum-stride", |
| "The minimum constant stride beyond which we should use prefetch " |
| "hints for.", |
| -1, 0, 0) |
| |
| /* Maximum number of statements in loop nest for loop interchange. */ |
| |
| DEFPARAM (PARAM_LOOP_INTERCHANGE_MAX_NUM_STMTS, |
| "loop-interchange-max-num-stmts", |
| "The maximum number of stmts in loop nest for loop interchange.", |
| 64, 0, 0) |
| |
| /* Minimum stride ratio for loop interchange to be profitiable. */ |
| |
| DEFPARAM (PARAM_LOOP_INTERCHANGE_STRIDE_RATIO, |
| "loop-interchange-stride-ratio", |
| "The minimum stride ratio for loop interchange to be profitable.", |
| 2, 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 deep |
| loop nests cause compile-time to blow up. If we hit this limit, |
| FRE and PRE will value-number outer loops (but the outermost) in a |
| loop nest non-optimistically. */ |
| |
| DEFPARAM (PARAM_RPO_VN_MAX_LOOP_DEPTH, |
| "rpo-vn-max-loop-depth", |
| "Maximum depth of a loop nest to fully value-number optimistically.", |
| 7, 2, 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) |
| |
| DEFPARAM (PARAM_LRA_INHERITANCE_EBB_PROBABILITY_CUTOFF, |
| "lra-inheritance-ebb-probability-cutoff", |
| "Minimal fall-through edge probability in percentage used to add BB to inheritance EBB in LRA.", |
| 40, 0, 100) |
| |
| /* 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 array references in a scop. */ |
| |
| DEFPARAM (PARAM_GRAPHITE_MAX_ARRAYS_PER_SCOP, |
| "graphite-max-arrays-per-scop", |
| "Maximum number of arrays per SCoP.", |
| 100, 0, 0) |
| |
| DEFPARAM (PARAM_MAX_ISL_OPERATIONS, |
| "max-isl-operations", |
| "Maximum number of isl operations, 0 means unlimited.", |
| 350000, 0, 0) |
| |
| /* For testsuite purposes allow to check for codegen error handling. */ |
| DEFPARAM (PARAM_GRAPHITE_ALLOW_CODEGEN_ERRORS, |
| "graphite-allow-codegen-errors", |
| "Whether codegen errors should be ICEs when -fchecking.", |
| 0, 0, 1) |
| |
| /* 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) |
| |
| /* When the parameter is 1, use the internal function id |
| to look up for profile data. Otherwise, use a more stable |
| external id based on assembler name and source location. */ |
| DEFPARAM (PARAM_PROFILE_FUNC_INTERNAL_ID, |
| "profile-func-internal-id", |
| "Use internal function id in profile lookup.", |
| 0, 0, 1) |
| |
| /* When the parameter is 1, track the most frequent N target |
| addresses in indirect-call profile. This disables |
| indirect_call_profiler_v3 which tracks single target. */ |
| DEFPARAM (PARAM_INDIR_CALL_TOPN_PROFILE, |
| "indir-call-topn-profile", |
| "Track top N target addresses in indirect-call profile.", |
| 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 a threshold to discard debug markers (e.g. debug begin stmt |
| markers) when expanding a function to RTL, or inlining it into |
| another function. */ |
| |
| DEFPARAM (PARAM_MAX_DEBUG_MARKER_COUNT, |
| "max-debug-marker-count", |
| "Max. count of debug markers to expand or inline.", |
| 100000, 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, 0, 0) |
| |
| DEFPARAM (PARAM_IPA_SRA_PTR_GROWTH_FACTOR, |
| "ipa-sra-ptr-growth-factor", |
| "Maximum allowed growth of number and total size of new parameters " |
| "that 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_SRA_MAX_SCALARIZATION_SIZE_SPEED, |
| "sra-max-scalarization-size-Ospeed", |
| "Maximum size, in storage units, of an aggregate which should be " |
| "considered for scalarization when compiling for speed.", |
| 0, 0, 0) |
| |
| DEFPARAM (PARAM_SRA_MAX_SCALARIZATION_SIZE_SIZE, |
| "sra-max-scalarization-size-Osize", |
| "Maximum size, in storage units, of an aggregate which should be " |
| "considered for scalarization when compiling for size.", |
| 0, 0, 0) |
| |
| DEFPARAM (PARAM_SRA_MAX_PROPAGATIONS, |
| "sra-max-propagations", |
| "Maximum number of artificial accesses to enable forward propagation " |
| "that Scalar Replacement of Aggregates will keep for one local " |
| "variable.", |
| 32, 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_CP_RECURSION_PENALTY, |
| "ipa-cp-recursion-penalty", |
| "Percentage penalty the recursive functions will receive when they " |
| "are evaluated for cloning.", |
| 40, 0, 100) |
| |
| DEFPARAM (PARAM_IPA_CP_SINGLE_CALL_PENALTY, |
| "ipa-cp-single-call-penalty", |
| "Percentage penalty functions containing a single call to another " |
| "function will receive when they are evaluated for cloning.", |
| 15, 0, 100) |
| |
| 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) |
| |
| DEFPARAM (PARAM_IPA_MAX_AA_STEPS, |
| "ipa-max-aa-steps", |
| "Maximum number of statements that will be visited by IPA formal " |
| "parameter analysis based on alias analysis in any given function.", |
| 25000, 0, 0) |
| |
| /* WHOPR partitioning configuration. */ |
| |
| DEFPARAM (PARAM_LTO_PARTITIONS, |
| "lto-partitions", |
| "Number of partitions the program should be split to.", |
| 128, 1, 0) |
| |
| DEFPARAM (MIN_PARTITION_SIZE, |
| "lto-min-partition", |
| "Minimal size of a partition for LTO (in estimated instructions).", |
| 10000, 0, 0) |
| |
| DEFPARAM (MAX_PARTITION_SIZE, |
| "lto-max-partition", |
| "Maximal size of a partition for LTO (in estimated instructions).", |
| 1000000, 0, INT_MAX) |
| |
| DEFPARAM (PARAM_MAX_LTO_STREAMING_PARALLELISM, |
| "lto-max-streaming-parallelism", |
| "maximal number of LTO partitions streamed in parallel.", |
| 32, 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) |
| |
| /* 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_STORE_DATA_RACES, |
| "allow-store-data-races", |
| "Allow new data races on stores to be introduced.", |
| 0, 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_STORE_MERGING_ALLOW_UNALIGNED, |
| "store-merging-allow-unaligned", |
| "Allow the store merging pass to introduce unaligned stores " |
| "if it is legal to do so.", |
| 1, 0, 1) |
| |
| DEFPARAM (PARAM_MAX_STORES_TO_MERGE, |
| "max-stores-to-merge", |
| "Maximum number of constant stores to merge in the " |
| "store merging pass.", |
| 64, 2, 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.", |
| 10000, 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) |
| |
| /* ASan stands for AddressSanitizer: https://github.com/google/sanitizers. */ |
| |
| DEFPARAM (PARAM_ASAN_STACK, |
| "asan-stack", |
| "Enable asan stack protection.", |
| 1, 0, 1) |
| |
| DEFPARAM (PARAM_ASAN_PROTECT_ALLOCAS, |
| "asan-instrument-allocas", |
| "Enable asan allocas/VLAs 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 detection of use-after-return bugs.", |
| 1, 0, 1) |
| |
| DEFPARAM (PARAM_ASAN_INSTRUMENTATION_WITH_CALL_THRESHOLD, |
| "asan-instrumentation-with-call-threshold", |
| "Use callbacks instead of inline code if number of accesses " |
| "in function becomes greater or equal to this number.", |
| 7000, 0, INT_MAX) |
| |
| DEFPARAM (PARAM_USE_AFTER_SCOPE_DIRECT_EMISSION_THRESHOLD, |
| "use-after-scope-direct-emission-threshold", |
| "Use direct poisoning/unpoisoning instructions for variables " |
| "smaller or equal to this number.", |
| 256, 0, INT_MAX) |
| |
| 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) |
| |
| DEFPARAM (PARAM_FSM_SCALE_PATH_STMTS, |
| "fsm-scale-path-stmts", |
| "Scale factor to apply to the number of statements in a threading path when comparing to the number of (scaled) blocks.", |
| 2, 1, 10) |
| |
| DEFPARAM (PARAM_FSM_MAXIMUM_PHI_ARGUMENTS, |
| "fsm-maximum-phi-arguments", |
| "Maximum number of arguments a PHI may have before the FSM threader will not try to thread through its block.", |
| 100, 1, 999999) |
| |
| DEFPARAM (PARAM_FSM_SCALE_PATH_BLOCKS, |
| "fsm-scale-path-blocks", |
| "Scale factor to apply to the number of blocks in a threading path when comparing to the number of (scaled) statements.", |
| 3, 1, 10) |
| |
| DEFPARAM (PARAM_MAX_FSM_THREAD_PATH_INSNS, |
| "max-fsm-thread-path-insns", |
| "Maximum number of instructions to copy when duplicating blocks on a finite state automaton jump thread path.", |
| 100, 1, 999999) |
| |
| DEFPARAM (PARAM_MAX_FSM_THREAD_LENGTH, |
| "max-fsm-thread-length", |
| "Maximum number of basic blocks on a finite state automaton jump thread path.", |
| 10, 1, 999999) |
| |
| DEFPARAM (PARAM_MAX_FSM_THREAD_PATHS, |
| "max-fsm-thread-paths", |
| "Maximum number of new jump thread paths to create for a finite state automaton.", |
| 50, 1, 999999) |
| |
| DEFPARAM (PARAM_PARLOOPS_CHUNK_SIZE, |
| "parloops-chunk-size", |
| "Chunk size of omp schedule for loops parallelized by parloops.", |
| 0, 0, 0) |
| |
| DEFPARAMENUM5 (PARAM_PARLOOPS_SCHEDULE, |
| "parloops-schedule", |
| "Schedule type of omp schedule for loops parallelized by " |
| "parloops (static, dynamic, guided, auto, runtime).", |
| static, |
| static, dynamic, guided, auto, runtime) |
| |
| DEFPARAM (PARAM_PARLOOPS_MIN_PER_THREAD, |
| "parloops-min-per-thread", |
| "Minimum number of iterations per thread of an innermost " |
| "parallelized loop.", |
| 100, 2, 0) |
| |
| DEFPARAM (PARAM_MAX_SSA_NAME_QUERY_DEPTH, |
| "max-ssa-name-query-depth", |
| "Maximum recursion depth allowed when querying a property of an" |
| " SSA name.", |
| 3, 1, 10) |
| |
| DEFPARAM (PARAM_MAX_RTL_IF_CONVERSION_INSNS, |
| "max-rtl-if-conversion-insns", |
| "Maximum number of insns in a basic block to consider for RTL " |
| "if-conversion.", |
| 10, 0, 99) |
| |
| DEFPARAM (PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST, |
| "max-rtl-if-conversion-predictable-cost", |
| "Maximum permissible cost for the sequence that would be " |
| "generated by the RTL if-conversion pass for a branch that " |
| "is considered predictable.", |
| 20, 0, 200) |
| |
| DEFPARAM (PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST, |
| "max-rtl-if-conversion-unpredictable-cost", |
| "Maximum permissible cost for the sequence that would be " |
| "generated by the RTL if-conversion pass for a branch that " |
| "is considered unpredictable.", |
| 40, 0, 200) |
| |
| DEFPARAM (PARAM_HSA_GEN_DEBUG_STORES, |
| "hsa-gen-debug-stores", |
| "Level of hsa debug stores verbosity.", |
| 0, 0, 1) |
| |
| DEFPARAM (PARAM_MAX_SPECULATIVE_DEVIRT_MAYDEFS, |
| "max-speculative-devirt-maydefs", |
| "Maximum number of may-defs visited when devirtualizing " |
| "speculatively.", 50, 0, 0) |
| |
| DEFPARAM (PARAM_MAX_VRP_SWITCH_ASSERTIONS, |
| "max-vrp-switch-assertions", |
| "Maximum number of assertions to add along the default " |
| "edge of a switch statement during VRP.", |
| 10, 0, 0) |
| |
| DEFPARAM (PARAM_VECT_EPILOGUES_NOMASK, |
| "vect-epilogues-nomask", |
| "Enable loop epilogue vectorization using smaller vector size.", |
| 0, 0, 1) |
| |
| DEFPARAM(PARAM_UNROLL_JAM_MIN_PERCENT, |
| "unroll-jam-min-percent", |
| "Minimum percentage of memrefs that must go away for unroll-and-jam to be considered profitable.", |
| 1, 0, 100) |
| |
| DEFPARAM(PARAM_UNROLL_JAM_MAX_UNROLL, |
| "unroll-jam-max-unroll", |
| "Maximum unroll factor for the unroll-and-jam transformation.", |
| 4, 0, 0) |
| |
| DEFPARAM(PARAM_AVOID_FMA_MAX_BITS, |
| "avoid-fma-max-bits", |
| "Maximum number of bits for which we avoid creating FMAs.", |
| 0, 0, 512) |
| |
| DEFPARAM(PARAM_LOGICAL_OP_NON_SHORT_CIRCUIT, |
| "logical-op-non-short-circuit", |
| "True if a non-short-circuit operation is optimal.", |
| -1, -1, 1) |
| |
| DEFPARAM(PARAM_LOOP_VERSIONING_MAX_INNER_INSNS, |
| "loop-versioning-max-inner-insns", |
| "The maximum number of instructions in an inner loop that is being" |
| " considered for versioning.", |
| 200, 0, 0) |
| |
| DEFPARAM(PARAM_LOOP_VERSIONING_MAX_OUTER_INSNS, |
| "loop-versioning-max-outer-insns", |
| "The maximum number of instructions in an outer loop that is being" |
| " considered for versioning, on top of the instructions in inner" |
| " loops.", |
| 100, 0, 0) |
| |
| DEFPARAM(PARAM_SSA_NAME_DEF_CHAIN_LIMIT, |
| "ssa-name-def-chain-limit", |
| "The maximum number of SSA_NAME assignments to follow in determining " |
| "a value.", |
| 512, 0, 0) |
| |
| /* |
| |
| Local variables: |
| mode:c |
| End: |
| */ |