/* params.def - Run-time parameters.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2019 Free Software Foundation, Inc.
Written by Mark Mitchell <mark@codesourcery.com>.
This file is part of GCC.
- The enumeral corresponding to this parameter.
- - The name that can be used to set this parameter using the
+ - 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.
- The maximum acceptable value for the parameter (if greater than
the minimum).
- Be sure to add an entry to invoke.texi summarizing the parameter. */
+ 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.
-/* The threshold ratio between current and hottest structure counts.
- We say that if the ratio of the current structure count,
- calculated by profiling, to the hottest structure count
- in the program is less than this parameter, then structure
- reorganization is not applied. The default is 10%. */
-DEFPARAM (PARAM_STRUCT_REORG_COLD_STRUCT_RATIO,
- "struct-reorg-cold-struct-ratio",
- "The threshold ratio between current and hottest structure counts",
- 10, 0, 100)
+ 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 esitmated outcome of branch considered predictable",
+ "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.
- The default value is 450.
+ The default value is 400.
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
+ 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",
+ "The maximum number of instructions in a single function eligible for inlining.",
400, 0, 0)
/* The single function inlining limit for functions that are
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 90. */
+ The default value is 30. */
DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO,
"max-inline-insns-auto",
- "The maximum number of instructions when automatically inlining",
- 50, 0, 0)
+ "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, 0)
+
+DEFPARAM (PARAM_UNINLINED_FUNCTION_TIME,
+ "uninlined-function-time",
+ "Time accounted for function prologue, epilogue and other"
+ " overhead.",
+ 0, 0, 0)
+
+DEFPARAM (PARAM_UNINLINED_FUNCTION_THUNK_INSNS,
+ "uninlined-thunk-insns",
+ "Instruction accounted for function thunk overhead.",
+ 2, 0, 0)
+
+DEFPARAM (PARAM_UNINLINED_FUNCTION_THUNK_TIME,
+ "uninlined-thunk-time",
+ "Time accounted for function thunk overhead.",
+ 2, 0, 0)
DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE,
"max-inline-insns-recursive",
- "The maximum number of instructions inline function can grow to via recursive inlining",
+ "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",
+ "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",
+ "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",
+ "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",
+ "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
handled by late inlining. */
DEFPARAM (PARAM_EARLY_INLINER_MAX_ITERATIONS,
"max-early-inliner-iterations",
- "The maximum number of nested indirect inlining performed by early inliner",
- 10, 0, 0)
+ "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",
+ "If -fvariable-expansion-in-unroller is used, the maximum number of times that an individual variable will be expanded during loop unrolling.",
1, 0, 0)
-
+
/* Limit loop autovectorization to loops with large enough iteration count. */
DEFPARAM (PARAM_MIN_VECT_LOOP_BOUND,
"min-vect-loop-bound",
- "If -ftree-vectorize is used, the minimal loop bound of a loop to be considered for vectorization",
- 1, 1, 0)
+ "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
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",
+ "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 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",
+ "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
+/* 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 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",
+ "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",
+ "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)",
+ "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",
+ "The size of translation unit to be considered large.",
10000, 0, 0)
DEFPARAM(PARAM_INLINE_UNIT_GROWTH,
"inline-unit-growth",
- "how much can given compilation unit grow because of the inlining (in percent)",
- 30, 0, 0)
+ "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)",
+ "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",
- 8, 0, 0)
+ "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",
+ "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)",
+ "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",
- 50 * 1024 * 1024, 0, 0)
+ "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
(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",
+ "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",
+ "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",
+ "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",
+ "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",
+ "The maximum number of unrollings of a single loop.",
8, 0, 0)
/* The maximum number of insns of a peeled loop. */
DEFPARAM(PARAM_MAX_PEELED_INSNS,
"max-peeled-insns",
- "The maximum number of insns of a peeled loop",
- 400, 0, 0)
+ "The maximum number of 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",
+ "The maximum number of peelings of a single loop.",
16, 0, 0)
+/* The maximum number of peelings of a single loop that is peeled completely. */
+DEFPARAM(PARAM_MAX_PEEL_BRANCHES,
+ "max-peel-branches",
+ "The maximum number of branches on the path through the peeled sequence.",
+ 32, 0, 0)
/* The maximum number of insns of a peeled loop. */
DEFPARAM(PARAM_MAX_COMPLETELY_PEELED_INSNS,
"max-completely-peeled-insns",
- "The maximum number of insns of a completely peeled loop",
- 400, 0, 0)
+ "The 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",
+ "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",
+ "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",
+ "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",
+ "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",
+ "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",
+ "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",
+ "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",
+ "The number of cycles the swing modulo scheduler considers when checking conflicts using DFA.",
0, 0, 0)
DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD,
"sms-loop-average-count-threshold",
- "A threshold on the average loop count considered by the swing modulo scheduler",
+ "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",
+ "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",
+ "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, 0, 0)
+ "Select fraction of the maximal frequency of executions of basic block in function given basic block get alignment.",
+ 100, 1, 0)
DEFPARAM (PARAM_ALIGN_LOOP_ITERATIONS,
"align-loop-iterations",
- "Loops iterating at least selected number of iterations will get loop alignement.",
- 4, 0, 0)
+ "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.
+ flatten the profile.
We need to cut the maximal predicted iterations to large enough iterations
- so the loop appears important, but safely within HOT_BB_COUNT_FRACTION
+ 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",
+ "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",
+ "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",
+ "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)",
+ "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)",
+ "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",
+ "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",
+ "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",
+ "The maximum number of incoming edges to consider for crossjumping.",
100, 0, 0)
/* The minimum number of matching instructions to consider for crossjumping. */
DEFPARAM(PARAM_MIN_CROSSJUMP_INSNS,
"min-crossjump-insns",
- "The minimum number of matching instructions to consider for crossjumping",
- 5, 0, 0)
+ "The 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",
+ "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",
+ "The maximum number of insns to duplicate when unfactoring computed gotos.",
8, 0, 0)
/* The maximum length of path considered in cse. */
DEFPARAM(PARAM_MAX_CSE_PATH_LENGTH,
"max-cse-path-length",
- "The maximum length of path considered in cse",
- 10, 0, 0)
+ "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",
+ "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",
+ "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
DEFPARAM(PARAM_IV_CONSIDER_ALL_CANDIDATES_BOUND,
"iv-consider-all-candidates-bound",
- "Bound on number of candidates below that all candidates are considered in iv optimizations",
- 30, 0, 0)
+ "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",
+ "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
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",
+ "If number of candidates in the set is smaller, we always try to remove unused ivs during its optimization.",
10, 0, 0)
-DEFPARAM(PARAM_SCEV_MAX_EXPR_SIZE,
- "scev-max-expr-size",
- "Bound on size of expressions used in the scalar evolutions analyzer",
- 20, 0, 0)
+DEFPARAM(PARAM_AVG_LOOP_NITER,
+ "avg-loop-niter",
+ "Average number of iterations of a loop.",
+ 10, 1, 0)
-DEFPARAM(PARAM_OMEGA_MAX_VARS,
- "omega-max-vars",
- "Bound on the number of variables in Omega constraint systems",
- 128, 0, 0)
-
-DEFPARAM(PARAM_OMEGA_MAX_GEQS,
- "omega-max-geqs",
- "Bound on the number of inequalities in Omega constraint systems",
+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_OMEGA_MAX_EQS,
- "omega-max-eqs",
- "Bound on the number of equalities in Omega constraint systems",
- 128, 0, 0)
-
-DEFPARAM(PARAM_OMEGA_MAX_WILD_CARDS,
- "omega-max-wild-cards",
- "Bound on the number of wild cards in Omega constraint systems",
- 18, 0, 0)
+DEFPARAM(PARAM_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_OMEGA_HASH_TABLE_SIZE,
- "omega-hash-table-size",
- "Bound on the size of the hash table in Omega constraint systems",
- 550, 0, 0)
+DEFPARAM(PARAM_SCEV_MAX_EXPR_SIZE,
+ "scev-max-expr-size",
+ "Bound on size of expressions used in the scalar evolutions analyzer.",
+ 100, 0, 0)
-DEFPARAM(PARAM_OMEGA_MAX_KEYS,
- "omega-max-keys",
- "Bound on the number of keys in Omega constraint systems",
- 500, 0, 0)
+DEFPARAM(PARAM_SCEV_MAX_EXPR_COMPLEXITY,
+ "scev-max-expr-complexity",
+ "Bound on the complexity of the expressions in the scalar evolutions analyzer.",
+ 10, 0, 0)
-DEFPARAM(PARAM_OMEGA_ELIMINATE_REDUNDANT_CONSTRAINTS,
- "omega-eliminate-redundant-constraints",
- "When set to 1, use expensive methods to eliminate all redundant constraints",
- 0, 0, 1)
+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",
+ "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",
+ "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",
+ "The maximum memory locations recorded by cselib.",
500, 0, 0)
#ifdef ENABLE_GC_ALWAYS_COLLECT
DEFPARAM(GGC_MIN_EXPAND,
"ggc-min-expand",
- "Minimum heap expansion to trigger garbage collection, as a percentage of the total size of the heap",
+ "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",
+ "Minimum heap size before we start collecting garbage, in kilobytes.",
GGC_MIN_HEAPSIZE_DEFAULT, 0, 0)
#undef GGC_MIN_EXPAND_DEFAULT
DEFPARAM(PARAM_MAX_RELOAD_SEARCH_INSNS,
"max-reload-search-insns",
- "The maximum number of instructions to search backward when looking for equivalent reload",
+ "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",
+ "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",
+ "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",
+ "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",
+ "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",
+ "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",
+ "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",
+ "The maximum conflict delay for an insn to be considered for speculative motion.",
3, 1, 10)
DEFPARAM(PARAM_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",
+ "The maximum size of the lookahead window of selective scheduling.",
50, 0, 0)
DEFPARAM(PARAM_SELSCHED_MAX_SCHED_TIMES,
"selsched-max-sched-times",
- "Maximum number of times that an insn could be scheduled",
- 2, 0, 0)
+ "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",
+ "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",
+ "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",
+ "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 256 to be a good value. */
+ 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",
- 256, 2, 2)
-
-/* Incremental SSA updates for virtual operands may be very slow if
- there is a large number of mappings to process. In those cases, it
- is faster to rewrite the virtual symbols from scratch as if they
- had been recently introduced. This heuristic cannot be applied to
- SSA mappings for real SSA names, only symbols kept in FUD chains.
-
- PARAM_MIN_VIRTUAL_MAPPINGS specifies the minimum number of virtual
- mappings that should be registered to trigger the heuristic.
-
- PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO specifies the ratio between
- mappings and symbols. If the number of virtual mappings is
- PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO bigger than the number of
- virtual symbols to be updated, then the updater switches to a full
- update for those symbols. */
-DEFPARAM (PARAM_MIN_VIRTUAL_MAPPINGS,
- "min-virtual-mappings",
- "Minimum number of virtual mappings to consider switching to full virtual renames",
- 100, 0, 0)
-
-DEFPARAM (PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO,
- "virtual-mappings-ratio",
- "Ratio between virtual mappings and virtual symbols to do full virtual renames",
- 3, 0, 0)
+ "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",
+ "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.
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",
+ "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.
+ 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",
+ "Maximum number of fields in a structure before pointer analysis treats the structure as a single variable.",
0, 0, 0)
DEFPARAM(PARAM_MAX_SCHED_READY_INSNS,
"max-sched-ready-insns",
- "The maximum number of instructions ready to be issued to be considered by the scheduler during the first scheduling pass",
- 100, 0, 0)
+ "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. */
DEFPARAM (PARAM_PREFETCH_LATENCY,
"prefetch-latency",
- "The number of insns executed before prefetch is completed",
+ "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",
+ "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",
+ "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",
+ "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",
+ "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;
DEFPARAM (PARAM_USE_CANONICAL_TYPES,
"use-canonical-types",
- "Whether to 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",
+ "Maximum length of partial antic set when performing tree pre optimization.",
100, 0, 0)
-/* The following is used as a stop-gap limit for cases where really huge
- SCCs blow up memory and compile-time use too much. If we hit this limit,
- SCCVN and such FRE and PRE will be not done at all for the current
- function. */
+/* 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_SCCVN_MAX_SCC_SIZE,
- "sccvn-max-scc-size",
- "Maximum size of a SCC before SCCVN stops processing a function",
- 10000, 10, 0)
+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",
+ "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",
+ "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",
+ "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",
+ "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)
+ "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",
- 10, 0, 0)
+ "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",
+ "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, 1, 0)
+ "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 size of new parameters ipa-sra replaces "
- "a pointer to an aggregate with",
+ "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_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)
+
+/* 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)
+
/*
+
Local variables:
mode:c
End:
projects / gcc.git / blobdiff