/* 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: | |

*/ |