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authorBen Cheng <bccheng@google.com>2014-03-26 05:37:19 (GMT)
committerBen Cheng <bccheng@google.com>2014-03-26 05:37:19 (GMT)
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Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
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+/* params.def - Run-time parameters.
+ Copyright (C) 2001-2014 Free Software Foundation, Inc.
+ Written by Mark Mitchell <mark@codesourcery.com>.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+/* This file contains definitions for language-independent
+ parameters. The DEFPARAM macro takes 6 arguments:
+
+ - The enumeral corresponding to this parameter.
+
+ - The name that can be used to set this parameter using the
+ command-line option `--param <name>=<value>'.
+
+ - A help string explaining how the parameter is used.
+
+ - A default value for the parameter.
+
+ - The minimum acceptable value for the parameter.
+
+ - The maximum acceptable value for the parameter (if greater than
+ the minimum).
+
+ Be sure to add an entry to invoke.texi summarizing the parameter. */
+
+/* When branch is predicted to be taken with probability lower than this
+ threshold (in percent), then it is considered well predictable. */
+DEFPARAM (PARAM_PREDICTABLE_BRANCH_OUTCOME,
+ "predictable-branch-outcome",
+ "Maximal estimated outcome of branch considered predictable",
+ 2, 0, 50)
+
+DEFPARAM (PARAM_INLINE_MIN_SPEEDUP,
+ "inline-min-speedup",
+ "The minimal estimated speedup allowing inliner to ignore inline-insns-single and inline-isnsns-auto",
+ 10, 0, 0)
+
+/* The single function inlining limit. This is the maximum size
+ of a function counted in internal gcc instructions (not in
+ real machine instructions) that is eligible for inlining
+ by the tree inliner.
+ The default value is 450.
+ Only functions marked inline (or methods defined in the class
+ definition for C++) are affected by this.
+ There are more restrictions to inlining: If inlined functions
+ call other functions, the already inlined instructions are
+ counted and once the recursive inline limit (see
+ "max-inline-insns" parameter) is exceeded, the acceptable size
+ gets decreased. */
+DEFPARAM (PARAM_MAX_INLINE_INSNS_SINGLE,
+ "max-inline-insns-single",
+ "The maximum number of instructions in a single function eligible for inlining",
+ 400, 0, 0)
+
+/* The single function inlining limit for functions that are
+ inlined by virtue of -finline-functions (-O3).
+ This limit should be chosen to be below or equal to the limit
+ that is applied to functions marked inlined (or defined in the
+ class declaration in C++) given by the "max-inline-insns-single"
+ parameter.
+ The default value is 40. */
+DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO,
+ "max-inline-insns-auto",
+ "The maximum number of instructions when automatically inlining",
+ 40, 0, 0)
+
+DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE,
+ "max-inline-insns-recursive",
+ "The maximum number of instructions inline function can grow to via recursive inlining",
+ 450, 0, 0)
+
+DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO,
+ "max-inline-insns-recursive-auto",
+ "The maximum number of instructions non-inline function can grow to via recursive inlining",
+ 450, 0, 0)
+
+DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH,
+ "max-inline-recursive-depth",
+ "The maximum depth of recursive inlining for inline functions",
+ 8, 0, 0)
+
+DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO,
+ "max-inline-recursive-depth-auto",
+ "The maximum depth of recursive inlining for non-inline functions",
+ 8, 0, 0)
+
+DEFPARAM (PARAM_MIN_INLINE_RECURSIVE_PROBABILITY,
+ "min-inline-recursive-probability",
+ "Inline recursively only when the probability of call being executed exceeds the parameter",
+ 10, 0, 0)
+
+/* Limit of iterations of early inliner. This basically bounds number of
+ nested indirect calls early inliner can resolve. Deeper chains are still
+ handled by late inlining. */
+DEFPARAM (PARAM_EARLY_INLINER_MAX_ITERATIONS,
+ "max-early-inliner-iterations",
+ "The maximum number of nested indirect inlining performed by early inliner",
+ 1, 0, 0)
+
+/* Limit on probability of entry BB. */
+DEFPARAM (PARAM_COMDAT_SHARING_PROBABILITY,
+ "comdat-sharing-probability",
+ "Probability that COMDAT function will be shared with different compilation unit",
+ 20, 0, 0)
+
+/* Limit on probability of entry BB. */
+DEFPARAM (PARAM_PARTIAL_INLINING_ENTRY_PROBABILITY,
+ "partial-inlining-entry-probability",
+ "Maximum probability of the entry BB of split region (in percent relative to entry BB of the function) to make partial inlining happen",
+ 70, 0, 0)
+
+/* Limit the number of expansions created by the variable expansion
+ optimization to avoid register pressure. */
+DEFPARAM (PARAM_MAX_VARIABLE_EXPANSIONS,
+ "max-variable-expansions-in-unroller",
+ "If -fvariable-expansion-in-unroller is used, the maximum number of times that an individual variable will be expanded during loop unrolling",
+ 1, 0, 0)
+
+/* Limit loop autovectorization to loops with large enough iteration count. */
+DEFPARAM (PARAM_MIN_VECT_LOOP_BOUND,
+ "min-vect-loop-bound",
+ "If -ftree-vectorize is used, the minimal loop bound of a loop to be considered for vectorization",
+ 1, 1, 0)
+
+/* The maximum number of instructions to consider when looking for an
+ instruction to fill a delay slot. If more than this arbitrary
+ number of instructions is searched, the time savings from filling
+ the delay slot will be minimal so stop searching. Increasing
+ values mean more aggressive optimization, making the compile time
+ increase with probably small improvement in executable run time. */
+DEFPARAM (PARAM_MAX_DELAY_SLOT_INSN_SEARCH,
+ "max-delay-slot-insn-search",
+ "The maximum number of instructions to consider to fill a delay slot",
+ 100, 0, 0)
+
+/* When trying to fill delay slots, the maximum number of instructions
+ to consider when searching for a block with valid live register
+ information. Increasing this arbitrarily chosen value means more
+ aggressive optimization, increasing the compile time. This
+ parameter should be removed when the delay slot code is rewritten
+ to maintain the control-flow graph. */
+DEFPARAM(PARAM_MAX_DELAY_SLOT_LIVE_SEARCH,
+ "max-delay-slot-live-search",
+ "The maximum number of instructions to consider to find accurate live register information",
+ 333, 0, 0)
+
+/* This parameter limits the number of branch elements that the
+ scheduler will track anti-dependencies through without resetting
+ the tracking mechanism. Large functions with few calls or barriers
+ can generate lists containing many 1000's of dependencies. Generally
+ the compiler either uses all available memory, or runs for far too long. */
+DEFPARAM(PARAM_MAX_PENDING_LIST_LENGTH,
+ "max-pending-list-length",
+ "The maximum length of scheduling's pending operations list",
+ 32, 0, 0)
+
+/* This parameter limits the number of backtracking attempts when using the
+ haifa scheduler for modulo scheduling. */
+DEFPARAM(PARAM_MAX_MODULO_BACKTRACK_ATTEMPTS,
+ "max-modulo-backtrack-attempts",
+ "The maximum number of backtrack attempts the scheduler should make when modulo scheduling a loop",
+ 40, 0, 0)
+
+DEFPARAM(PARAM_LARGE_FUNCTION_INSNS,
+ "large-function-insns",
+ "The size of function body to be considered large",
+ 2700, 0, 0)
+DEFPARAM(PARAM_LARGE_FUNCTION_GROWTH,
+ "large-function-growth",
+ "Maximal growth due to inlining of large function (in percent)",
+ 100, 0, 0)
+DEFPARAM(PARAM_LARGE_UNIT_INSNS,
+ "large-unit-insns",
+ "The size of translation unit to be considered large",
+ 10000, 0, 0)
+DEFPARAM(PARAM_INLINE_UNIT_GROWTH,
+ "inline-unit-growth",
+ "How much can given compilation unit grow because of the inlining (in percent)",
+ 30, 0, 0)
+DEFPARAM(PARAM_IPCP_UNIT_GROWTH,
+ "ipcp-unit-growth",
+ "How much can given compilation unit grow because of the interprocedural constant propagation (in percent)",
+ 10, 0, 0)
+DEFPARAM(PARAM_EARLY_INLINING_INSNS,
+ "early-inlining-insns",
+ "Maximal estimated growth of function body caused by early inlining of single call",
+ 11, 0, 0)
+DEFPARAM(PARAM_LARGE_STACK_FRAME,
+ "large-stack-frame",
+ "The size of stack frame to be considered large",
+ 256, 0, 0)
+DEFPARAM(PARAM_STACK_FRAME_GROWTH,
+ "large-stack-frame-growth",
+ "Maximal stack frame growth due to inlining (in percent)",
+ 1000, 0, 0)
+
+/* The GCSE optimization will be disabled if it would require
+ significantly more memory than this value. */
+DEFPARAM(PARAM_MAX_GCSE_MEMORY,
+ "max-gcse-memory",
+ "The maximum amount of memory to be allocated by GCSE",
+ 50 * 1024 * 1024, 0, 0)
+
+/* The GCSE optimization of an expression will avoided if the ratio of
+ insertions to deletions is greater than this value. */
+DEFPARAM(PARAM_MAX_GCSE_INSERTION_RATIO,
+ "max-gcse-insertion-ratio",
+ "The maximum ratio of insertions to deletions of expressions in GCSE",
+ 20, 0, 0)
+
+/* This is the threshold ratio when to perform partial redundancy
+ elimination after reload. We perform partial redundancy elimination
+ when the following holds:
+ (Redundant load execution count)
+ ------------------------------- >= GCSE_AFTER_RELOAD_PARTIAL_FRACTION
+ (Added loads execution count) */
+DEFPARAM(PARAM_GCSE_AFTER_RELOAD_PARTIAL_FRACTION,
+ "gcse-after-reload-partial-fraction",
+ "The threshold ratio for performing partial redundancy elimination after reload",
+ 3, 0, 0)
+/* This is the threshold ratio of the critical edges execution count compared to
+ the redundant loads execution count that permits performing the load
+ redundancy elimination in gcse after reload. */
+DEFPARAM(PARAM_GCSE_AFTER_RELOAD_CRITICAL_FRACTION,
+ "gcse-after-reload-critical-fraction",
+ "The threshold ratio of critical edges execution count that permit performing redundancy elimination after reload",
+ 10, 0, 0)
+
+/* GCSE will use GCSE_COST_DISTANCE_RATION as a scaling factor
+ to calculate maximum distance for which an expression is allowed to move
+ from its rtx_cost. */
+DEFPARAM(PARAM_GCSE_COST_DISTANCE_RATIO,
+ "gcse-cost-distance-ratio",
+ "Scaling factor in calculation of maximum distance an expression can be moved by GCSE optimizations",
+ 10, 0, 0)
+/* GCSE won't restrict distance for which an expression with rtx_cost greater
+ than COSTS_N_INSN(GCSE_UNRESTRICTED_COST) is allowed to move. */
+DEFPARAM(PARAM_GCSE_UNRESTRICTED_COST,
+ "gcse-unrestricted-cost",
+ "Cost at which GCSE optimizations will not constraint the distance an expression can travel",
+ 3, 0, 0)
+
+/* How deep from a given basic block the dominator tree should be searched
+ for expressions to hoist to the block. The value of 0 will avoid limiting
+ the search. */
+DEFPARAM(PARAM_MAX_HOIST_DEPTH,
+ "max-hoist-depth",
+ "Maximum depth of search in the dominator tree for expressions to hoist",
+ 30, 0, 0)
+
+/* This parameter limits the number of insns in a loop that will be unrolled,
+ and by how much the loop is unrolled.
+
+ This limit should be at most half of the peeling limits: loop unroller
+ decides to not unroll loops that iterate fewer than 2*number of allowed
+ unrollings and thus we would have loops that are neither peeled or unrolled
+ otherwise. */
+DEFPARAM(PARAM_MAX_UNROLLED_INSNS,
+ "max-unrolled-insns",
+ "The maximum number of instructions to consider to unroll in a loop",
+ 200, 0, 0)
+/* This parameter limits how many times the loop is unrolled depending
+ on number of insns really executed in each iteration. */
+DEFPARAM(PARAM_MAX_AVERAGE_UNROLLED_INSNS,
+ "max-average-unrolled-insns",
+ "The maximum number of instructions to consider to unroll in a loop on average",
+ 80, 0, 0)
+/* The maximum number of unrollings of a single loop. */
+DEFPARAM(PARAM_MAX_UNROLL_TIMES,
+ "max-unroll-times",
+ "The maximum number of unrollings of a single loop",
+ 8, 0, 0)
+/* The maximum number of insns of a peeled loop. */
+DEFPARAM(PARAM_MAX_PEELED_INSNS,
+ "max-peeled-insns",
+ "The maximum number of insns of a peeled loop",
+ 100, 0, 0)
+/* The maximum number of peelings of a single loop. */
+DEFPARAM(PARAM_MAX_PEEL_TIMES,
+ "max-peel-times",
+ "The maximum number of peelings of a single loop",
+ 16, 0, 0)
+/* The maximum number of peelings of a single loop that is peeled completely. */
+DEFPARAM(PARAM_MAX_PEEL_BRANCHES,
+ "max-peel-branches",
+ "The maximum number of branches on the path through the peeled sequence",
+ 32, 0, 0)
+/* The maximum number of insns of a peeled loop. */
+DEFPARAM(PARAM_MAX_COMPLETELY_PEELED_INSNS,
+ "max-completely-peeled-insns",
+ "The maximum number of insns of a completely peeled loop",
+ 100, 0, 0)
+/* The maximum number of peelings of a single loop that is peeled completely. */
+DEFPARAM(PARAM_MAX_COMPLETELY_PEEL_TIMES,
+ "max-completely-peel-times",
+ "The maximum number of peelings of a single loop that is peeled completely",
+ 16, 0, 0)
+/* The maximum number of insns of a peeled loop that rolls only once. */
+DEFPARAM(PARAM_MAX_ONCE_PEELED_INSNS,
+ "max-once-peeled-insns",
+ "The maximum number of insns of a peeled loop that rolls only once",
+ 400, 0, 0)
+/* The maximum depth of a loop nest we completely peel. */
+DEFPARAM(PARAM_MAX_UNROLL_ITERATIONS,
+ "max-completely-peel-loop-nest-depth",
+ "The maximum depth of a loop nest we completely peel",
+ 8, 0, 0)
+
+/* The maximum number of insns of an unswitched loop. */
+DEFPARAM(PARAM_MAX_UNSWITCH_INSNS,
+ "max-unswitch-insns",
+ "The maximum number of insns of an unswitched loop",
+ 50, 0, 0)
+/* The maximum level of recursion in unswitch_single_loop. */
+DEFPARAM(PARAM_MAX_UNSWITCH_LEVEL,
+ "max-unswitch-level",
+ "The maximum number of unswitchings in a single loop",
+ 3, 0, 0)
+
+/* The maximum number of iterations of a loop the brute force algorithm
+ for analysis of # of iterations of the loop tries to evaluate. */
+DEFPARAM(PARAM_MAX_ITERATIONS_TO_TRACK,
+ "max-iterations-to-track",
+ "Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates",
+ 1000, 0, 0)
+/* A cutoff to avoid costly computations of the number of iterations in
+ the doloop transformation. */
+DEFPARAM(PARAM_MAX_ITERATIONS_COMPUTATION_COST,
+ "max-iterations-computation-cost",
+ "Bound on the cost of an expression to compute the number of iterations",
+ 10, 0, 0)
+
+/* This parameter is used to tune SMS MAX II calculations. */
+DEFPARAM(PARAM_SMS_MAX_II_FACTOR,
+ "sms-max-ii-factor",
+ "A factor for tuning the upper bound that swing modulo scheduler uses for scheduling a loop",
+ 100, 0, 0)
+/* The minimum value of stage count that swing modulo scheduler will generate. */
+DEFPARAM(PARAM_SMS_MIN_SC,
+ "sms-min-sc",
+ "The minimum value of stage count that swing modulo scheduler will generate.",
+ 2, 1, 1)
+DEFPARAM(PARAM_SMS_DFA_HISTORY,
+ "sms-dfa-history",
+ "The number of cycles the swing modulo scheduler considers when checking conflicts using DFA",
+ 0, 0, 0)
+DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD,
+ "sms-loop-average-count-threshold",
+ "A threshold on the average loop count considered by the swing modulo scheduler",
+ 0, 0, 0)
+
+DEFPARAM(HOT_BB_COUNT_WS_PERMILLE,
+ "hot-bb-count-ws-permille",
+ "A basic block profile count is considered hot if it contributes to "
+ "the given permillage of the entire profiled execution",
+ 999, 0, 1000)
+DEFPARAM(HOT_BB_FREQUENCY_FRACTION,
+ "hot-bb-frequency-fraction",
+ "Select fraction of the maximal frequency of executions of basic block in function given basic block needs to have to be considered hot",
+ 1000, 0, 0)
+
+DEFPARAM(UNLIKELY_BB_COUNT_FRACTION,
+ "unlikely-bb-count-fraction",
+ "The minimum fraction of profile runs a given basic block execution count must be not to be considered unlikely",
+ 20, 1, 10000)
+
+DEFPARAM (PARAM_ALIGN_THRESHOLD,
+ "align-threshold",
+ "Select fraction of the maximal frequency of executions of basic block in function given basic block get alignment",
+ 100, 1, 0)
+
+DEFPARAM (PARAM_ALIGN_LOOP_ITERATIONS,
+ "align-loop-iterations",
+ "Loops iterating at least selected number of iterations will get loop alignement.",
+ 4, 0, 0)
+
+/* For guessed profiles, the loops having unknown number of iterations
+ are predicted to iterate relatively few (10) times at average.
+ For functions containing one loop with large known number of iterations
+ and other loops having unbounded loops we would end up predicting all
+ the other loops cold that is not usually the case. So we need to artificially
+ flatten the profile.
+
+ We need to cut the maximal predicted iterations to large enough iterations
+ so the loop appears important, but safely within maximum hotness
+ range. */
+
+DEFPARAM(PARAM_MAX_PREDICTED_ITERATIONS,
+ "max-predicted-iterations",
+ "The maximum number of loop iterations we predict statically",
+ 100, 0, 0)
+
+/* This parameter controls the probability of builtin_expect. The default
+ value is 90%. This empirical value is obtained through the weighted
+ probability of FDO counters (with the FDO count value as the weight)
+ in some real world programs:
+ (1) Google performance test benchmarks: the probability is 0.9081.
+ (2) Linux 3.3 kernel running Google search workload: the probability
+ is 0.8717. */
+
+DEFPARAM(BUILTIN_EXPECT_PROBABILITY,
+ "builtin-expect-probability",
+ "Set the estimated probability in percentage for builtin expect. The default value is 90% probability.",
+ 90, 0, 100)
+DEFPARAM(TRACER_DYNAMIC_COVERAGE_FEEDBACK,
+ "tracer-dynamic-coverage-feedback",
+ "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is available",
+ 95, 0, 100)
+DEFPARAM(TRACER_DYNAMIC_COVERAGE,
+ "tracer-dynamic-coverage",
+ "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is not available",
+ 75, 0, 100)
+DEFPARAM(TRACER_MAX_CODE_GROWTH,
+ "tracer-max-code-growth",
+ "Maximal code growth caused by tail duplication (in percent)",
+ 100, 0, 0)
+DEFPARAM(TRACER_MIN_BRANCH_RATIO,
+ "tracer-min-branch-ratio",
+ "Stop reverse growth if the reverse probability of best edge is less than this threshold (in percent)",
+ 10, 0, 100)
+DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY_FEEDBACK,
+ "tracer-min-branch-probability-feedback",
+ "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is available",
+ 80, 0, 100)
+DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY,
+ "tracer-min-branch-probability",
+ "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is not available",
+ 50, 0, 100)
+
+/* The maximum number of incoming edges to consider for crossjumping. */
+DEFPARAM(PARAM_MAX_CROSSJUMP_EDGES,
+ "max-crossjump-edges",
+ "The maximum number of incoming edges to consider for crossjumping",
+ 100, 0, 0)
+
+/* The minimum number of matching instructions to consider for crossjumping. */
+DEFPARAM(PARAM_MIN_CROSSJUMP_INSNS,
+ "min-crossjump-insns",
+ "The minimum number of matching instructions to consider for crossjumping",
+ 5, 1, 0)
+
+/* The maximum number expansion factor when copying basic blocks. */
+DEFPARAM(PARAM_MAX_GROW_COPY_BB_INSNS,
+ "max-grow-copy-bb-insns",
+ "The maximum expansion factor when copying basic blocks",
+ 8, 0, 0)
+
+/* The maximum number of insns to duplicate when unfactoring computed gotos. */
+DEFPARAM(PARAM_MAX_GOTO_DUPLICATION_INSNS,
+ "max-goto-duplication-insns",
+ "The maximum number of insns to duplicate when unfactoring computed gotos",
+ 8, 0, 0)
+
+/* The maximum length of path considered in cse. */
+DEFPARAM(PARAM_MAX_CSE_PATH_LENGTH,
+ "max-cse-path-length",
+ "The maximum length of path considered in cse",
+ 10, 1, 0)
+DEFPARAM(PARAM_MAX_CSE_INSNS,
+ "max-cse-insns",
+ "The maximum instructions CSE process before flushing",
+ 1000, 0, 0)
+
+/* The cost of expression in loop invariant motion that is considered
+ expensive. */
+DEFPARAM(PARAM_LIM_EXPENSIVE,
+ "lim-expensive",
+ "The minimum cost of an expensive expression in the loop invariant motion",
+ 20, 0, 0)
+
+/* Bound on number of candidates for induction variables below that
+ all candidates are considered for each use in induction variable
+ optimizations. */
+
+DEFPARAM(PARAM_IV_CONSIDER_ALL_CANDIDATES_BOUND,
+ "iv-consider-all-candidates-bound",
+ "Bound on number of candidates below that all candidates are considered in iv optimizations",
+ 30, 0, 0)
+
+/* The induction variable optimizations give up on loops that contain more
+ induction variable uses. */
+
+DEFPARAM(PARAM_IV_MAX_CONSIDERED_USES,
+ "iv-max-considered-uses",
+ "Bound on number of iv uses in loop optimized in iv optimizations",
+ 250, 0, 0)
+
+/* If there are at most this number of ivs in the set, try removing unnecessary
+ ivs from the set always. */
+
+DEFPARAM(PARAM_IV_ALWAYS_PRUNE_CAND_SET_BOUND,
+ "iv-always-prune-cand-set-bound",
+ "If number of candidates in the set is smaller, we always try to remove unused ivs during its optimization",
+ 10, 0, 0)
+
+DEFPARAM(PARAM_SCEV_MAX_EXPR_SIZE,
+ "scev-max-expr-size",
+ "Bound on size of expressions used in the scalar evolutions analyzer",
+ 100, 0, 0)
+
+DEFPARAM(PARAM_SCEV_MAX_EXPR_COMPLEXITY,
+ "scev-max-expr-complexity",
+ "Bound on the complexity of the expressions in the scalar evolutions analyzer",
+ 10, 0, 0)
+
+DEFPARAM(PARAM_OMEGA_MAX_VARS,
+ "omega-max-vars",
+ "Bound on the number of variables in Omega constraint systems",
+ 128, 0, 0)
+
+DEFPARAM(PARAM_OMEGA_MAX_GEQS,
+ "omega-max-geqs",
+ "Bound on the number of inequalities in Omega constraint systems",
+ 256, 0, 0)
+
+DEFPARAM(PARAM_OMEGA_MAX_EQS,
+ "omega-max-eqs",
+ "Bound on the number of equalities in Omega constraint systems",
+ 128, 0, 0)
+
+DEFPARAM(PARAM_OMEGA_MAX_WILD_CARDS,
+ "omega-max-wild-cards",
+ "Bound on the number of wild cards in Omega constraint systems",
+ 18, 0, 0)
+
+DEFPARAM(PARAM_OMEGA_HASH_TABLE_SIZE,
+ "omega-hash-table-size",
+ "Bound on the size of the hash table in Omega constraint systems",
+ 550, 0, 0)
+
+DEFPARAM(PARAM_OMEGA_MAX_KEYS,
+ "omega-max-keys",
+ "Bound on the number of keys in Omega constraint systems",
+ 500, 0, 0)
+
+DEFPARAM(PARAM_OMEGA_ELIMINATE_REDUNDANT_CONSTRAINTS,
+ "omega-eliminate-redundant-constraints",
+ "When set to 1, use expensive methods to eliminate all redundant constraints",
+ 0, 0, 1)
+
+DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS,
+ "vect-max-version-for-alignment-checks",
+ "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alignment check",
+ 6, 0, 0)
+
+DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS,
+ "vect-max-version-for-alias-checks",
+ "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alias check",
+ 10, 0, 0)
+
+DEFPARAM(PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT,
+ "vect-max-peeling-for-alignment",
+ "Max number of loop peels to enhancement alignment of data references in a loop",
+ -1, -1, 64)
+
+DEFPARAM(PARAM_MAX_CSELIB_MEMORY_LOCATIONS,
+ "max-cselib-memory-locations",
+ "The maximum memory locations recorded by cselib",
+ 500, 0, 0)
+
+#ifdef ENABLE_GC_ALWAYS_COLLECT
+# define GGC_MIN_EXPAND_DEFAULT 0
+# define GGC_MIN_HEAPSIZE_DEFAULT 0
+#else
+# define GGC_MIN_EXPAND_DEFAULT 30
+# define GGC_MIN_HEAPSIZE_DEFAULT 4096
+#endif
+
+DEFPARAM(GGC_MIN_EXPAND,
+ "ggc-min-expand",
+ "Minimum heap expansion to trigger garbage collection, as a percentage of the total size of the heap",
+ GGC_MIN_EXPAND_DEFAULT, 0, 0)
+
+DEFPARAM(GGC_MIN_HEAPSIZE,
+ "ggc-min-heapsize",
+ "Minimum heap size before we start collecting garbage, in kilobytes",
+ GGC_MIN_HEAPSIZE_DEFAULT, 0, 0)
+
+#undef GGC_MIN_EXPAND_DEFAULT
+#undef GGC_MIN_HEAPSIZE_DEFAULT
+
+DEFPARAM(PARAM_MAX_RELOAD_SEARCH_INSNS,
+ "max-reload-search-insns",
+ "The maximum number of instructions to search backward when looking for equivalent reload",
+ 100, 0, 0)
+
+DEFPARAM(PARAM_SINK_FREQUENCY_THRESHOLD,
+ "sink-frequency-threshold",
+ "Target block's relative execution frequency (as a percentage) required to sink a statement",
+ 75, 0, 100)
+
+DEFPARAM(PARAM_MAX_SCHED_REGION_BLOCKS,
+ "max-sched-region-blocks",
+ "The maximum number of blocks in a region to be considered for interblock scheduling",
+ 10, 0, 0)
+
+DEFPARAM(PARAM_MAX_SCHED_REGION_INSNS,
+ "max-sched-region-insns",
+ "The maximum number of insns in a region to be considered for interblock scheduling",
+ 100, 0, 0)
+
+DEFPARAM(PARAM_MAX_PIPELINE_REGION_BLOCKS,
+ "max-pipeline-region-blocks",
+ "The maximum number of blocks in a region to be considered for interblock scheduling",
+ 15, 0, 0)
+
+DEFPARAM(PARAM_MAX_PIPELINE_REGION_INSNS,
+ "max-pipeline-region-insns",
+ "The maximum number of insns in a region to be considered for interblock scheduling",
+ 200, 0, 0)
+
+DEFPARAM(PARAM_MIN_SPEC_PROB,
+ "min-spec-prob",
+ "The minimum probability of reaching a source block for interblock speculative scheduling",
+ 40, 0, 0)
+
+DEFPARAM(PARAM_MAX_SCHED_EXTEND_REGIONS_ITERS,
+ "max-sched-extend-regions-iters",
+ "The maximum number of iterations through CFG to extend regions",
+ 0, 0, 0)
+
+DEFPARAM(PARAM_MAX_SCHED_INSN_CONFLICT_DELAY,
+ "max-sched-insn-conflict-delay",
+ "The maximum conflict delay for an insn to be considered for speculative motion",
+ 3, 1, 10)
+
+DEFPARAM(PARAM_SCHED_SPEC_PROB_CUTOFF,
+ "sched-spec-prob-cutoff",
+ "The minimal probability of speculation success (in percents), so that speculative insn will be scheduled.",
+ 40, 0, 100)
+
+DEFPARAM(PARAM_SCHED_STATE_EDGE_PROB_CUTOFF,
+ "sched-state-edge-prob-cutoff",
+ "The minimum probability an edge must have for the scheduler to save its state across it.",
+ 10, 0, 100)
+
+DEFPARAM(PARAM_SELSCHED_MAX_LOOKAHEAD,
+ "selsched-max-lookahead",
+ "The maximum size of the lookahead window of selective scheduling",
+ 50, 0, 0)
+
+DEFPARAM(PARAM_SELSCHED_MAX_SCHED_TIMES,
+ "selsched-max-sched-times",
+ "Maximum number of times that an insn could be scheduled",
+ 2, 0, 0)
+
+DEFPARAM(PARAM_SELSCHED_INSNS_TO_RENAME,
+ "selsched-insns-to-rename",
+ "Maximum number of instructions in the ready list that are considered eligible for renaming",
+ 2, 0, 0)
+
+DEFPARAM (PARAM_SCHED_MEM_TRUE_DEP_COST,
+ "sched-mem-true-dep-cost",
+ "Minimal distance between possibly conflicting store and load",
+ 1, 0, 0)
+
+DEFPARAM(PARAM_MAX_LAST_VALUE_RTL,
+ "max-last-value-rtl",
+ "The maximum number of RTL nodes that can be recorded as combiner's last value",
+ 10000, 0, 0)
+
+/* INTEGER_CST nodes are shared for values [{-1,0} .. N) for
+ {signed,unsigned} integral types. This determines N.
+ Experimentation shows 251 to be a good value that generates the
+ least amount of garbage for allocating the TREE_VEC storage. */
+DEFPARAM (PARAM_INTEGER_SHARE_LIMIT,
+ "integer-share-limit",
+ "The upper bound for sharing integer constants",
+ 251, 2, 2)
+
+DEFPARAM (PARAM_SSP_BUFFER_SIZE,
+ "ssp-buffer-size",
+ "The lower bound for a buffer to be considered for stack smashing protection",
+ 8, 1, 0)
+
+DEFPARAM (PARAM_MIN_SIZE_FOR_STACK_SHARING,
+ "min-size-for-stack-sharing",
+ "The minimum size of variables taking part in stack slot sharing "
+ "when not optimizing",
+ 32, 0, 0)
+
+/* When we thread through a block we have to make copies of the
+ statements within the block. Clearly for large blocks the code
+ duplication is bad.
+
+ PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS specifies the maximum number
+ of statements and PHI nodes allowed in a block which is going to
+ be duplicated for thread jumping purposes.
+
+ Some simple analysis showed that more than 99% of the jump
+ threading opportunities are for blocks with less than 15
+ statements. So we can get the benefits of jump threading
+ without excessive code bloat for pathological cases with the
+ throttle set at 15 statements. */
+DEFPARAM (PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS,
+ "max-jump-thread-duplication-stmts",
+ "Maximum number of statements allowed in a block that needs to be duplicated when threading jumps",
+ 15, 0, 0)
+
+/* This is the maximum number of fields a variable may have before the pointer analysis machinery
+ will stop trying to treat it in a field-sensitive manner.
+ There are programs out there with thousands of fields per structure, and handling them
+ field-sensitively is not worth the cost. */
+DEFPARAM (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
+ "max-fields-for-field-sensitive",
+ "Maximum number of fields in a structure before pointer analysis treats the structure as a single variable",
+ 0, 0, 0)
+
+DEFPARAM(PARAM_MAX_SCHED_READY_INSNS,
+ "max-sched-ready-insns",
+ "The maximum number of instructions ready to be issued to be considered by the scheduler during the first scheduling pass",
+ 100, 0, 0)
+
+/* This is the maximum number of active local stores RTL DSE will consider. */
+DEFPARAM (PARAM_MAX_DSE_ACTIVE_LOCAL_STORES,
+ "max-dse-active-local-stores",
+ "Maximum number of active local stores in RTL dead store elimination",
+ 5000, 0, 0)
+
+/* Prefetching and cache-optimizations related parameters. Default values are
+ usually set by machine description. */
+
+/* The number of insns executed before prefetch is completed. */
+
+DEFPARAM (PARAM_PREFETCH_LATENCY,
+ "prefetch-latency",
+ "The number of insns executed before prefetch is completed",
+ 200, 0, 0)
+
+/* The number of prefetches that can run at the same time. */
+
+DEFPARAM (PARAM_SIMULTANEOUS_PREFETCHES,
+ "simultaneous-prefetches",
+ "The number of prefetches that can run at the same time",
+ 3, 0, 0)
+
+/* The size of L1 cache in kB. */
+
+DEFPARAM (PARAM_L1_CACHE_SIZE,
+ "l1-cache-size",
+ "The size of L1 cache",
+ 64, 0, 0)
+
+/* The size of L1 cache line in bytes. */
+
+DEFPARAM (PARAM_L1_CACHE_LINE_SIZE,
+ "l1-cache-line-size",
+ "The size of L1 cache line",
+ 32, 0, 0)
+
+/* The size of L2 cache in kB. */
+
+DEFPARAM (PARAM_L2_CACHE_SIZE,
+ "l2-cache-size",
+ "The size of L2 cache",
+ 512, 0, 0)
+
+/* Whether we should use canonical types rather than deep "structural"
+ type checking. Setting this value to 1 (the default) improves
+ compilation performance in the C++ and Objective-C++ front end;
+ this value should only be set to zero to work around bugs in the
+ canonical type system by disabling it. */
+
+DEFPARAM (PARAM_USE_CANONICAL_TYPES,
+ "use-canonical-types",
+ "Whether to use canonical types",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_MAX_PARTIAL_ANTIC_LENGTH,
+ "max-partial-antic-length",
+ "Maximum length of partial antic set when performing tree pre optimization",
+ 100, 0, 0)
+
+/* The following is used as a stop-gap limit for cases where really huge
+ SCCs blow up memory and compile-time use too much. If we hit this limit,
+ SCCVN and such FRE and PRE will be not done at all for the current
+ function. */
+
+DEFPARAM (PARAM_SCCVN_MAX_SCC_SIZE,
+ "sccvn-max-scc-size",
+ "Maximum size of a SCC before SCCVN stops processing a function",
+ 10000, 10, 0)
+
+/* The following is used as a stop-gap limit for cases where really huge
+ functions blow up compile-time use too much. It limits the number of
+ alias-queries we do for finding common subexpressions for memory loads and
+ stores. The number of alias-queries is otherwise limited by the number of
+ stores on paths to function entry. */
+
+DEFPARAM (PARAM_SCCVN_MAX_ALIAS_QUERIES_PER_ACCESS,
+ "sccvn-max-alias-queries-per-access",
+ "Maximum number of disambiguations to perform per memory access",
+ 1000, 0, 0)
+
+DEFPARAM (PARAM_IRA_MAX_LOOPS_NUM,
+ "ira-max-loops-num",
+ "Max loops number for regional RA",
+ 100, 0, 0)
+
+DEFPARAM (PARAM_IRA_MAX_CONFLICT_TABLE_SIZE,
+ "ira-max-conflict-table-size",
+ "Max size of conflict table in MB",
+ 1000, 0, 0)
+
+DEFPARAM (PARAM_IRA_LOOP_RESERVED_REGS,
+ "ira-loop-reserved-regs",
+ "The number of registers in each class kept unused by loop invariant motion",
+ 2, 0, 0)
+
+DEFPARAM (PARAM_LRA_MAX_CONSIDERED_RELOAD_PSEUDOS,
+ "lra-max-considered-reload-pseudos",
+ "The max number of reload pseudos which are considered during spilling a non-reload pseudo",
+ 500, 0, 0)
+
+/* Switch initialization conversion will refuse to create arrays that are
+ bigger than this parameter times the number of switch branches. */
+
+DEFPARAM (PARAM_SWITCH_CONVERSION_BRANCH_RATIO,
+ "switch-conversion-max-branch-ratio",
+ "The maximum ratio between array size and switch branches for "
+ "a switch conversion to take place",
+ 8, 1, 0)
+
+/* Size of tiles when doing loop blocking. */
+
+DEFPARAM (PARAM_LOOP_BLOCK_TILE_SIZE,
+ "loop-block-tile-size",
+ "size of tiles for loop blocking",
+ 51, 0, 0)
+
+/* Maximal number of parameters that we allow in a SCoP. */
+
+DEFPARAM (PARAM_GRAPHITE_MAX_NB_SCOP_PARAMS,
+ "graphite-max-nb-scop-params",
+ "maximum number of parameters in a SCoP",
+ 10, 0, 0)
+
+/* Maximal number of basic blocks in the functions analyzed by Graphite. */
+
+DEFPARAM (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION,
+ "graphite-max-bbs-per-function",
+ "maximum number of basic blocks per function to be analyzed by Graphite",
+ 100, 0, 0)
+
+/* Avoid data dependence analysis on very large loops. */
+DEFPARAM (PARAM_LOOP_MAX_DATAREFS_FOR_DATADEPS,
+ "loop-max-datarefs-for-datadeps",
+ "Maximum number of datarefs in loop for building loop data dependencies",
+ 1000, 0, 0)
+
+/* Avoid doing loop invariant motion on very large loops. */
+
+DEFPARAM (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
+ "loop-invariant-max-bbs-in-loop",
+ "Max basic blocks number in loop for loop invariant motion",
+ 10000, 0, 0)
+
+/* Avoid SLP vectorization of large basic blocks. */
+DEFPARAM (PARAM_SLP_MAX_INSNS_IN_BB,
+ "slp-max-insns-in-bb",
+ "Maximum number of instructions in basic block to be considered for SLP vectorization",
+ 1000, 0, 0)
+
+DEFPARAM (PARAM_MIN_INSN_TO_PREFETCH_RATIO,
+ "min-insn-to-prefetch-ratio",
+ "Min. ratio of insns to prefetches to enable prefetching for "
+ "a loop with an unknown trip count",
+ 9, 0, 0)
+
+DEFPARAM (PARAM_PREFETCH_MIN_INSN_TO_MEM_RATIO,
+ "prefetch-min-insn-to-mem-ratio",
+ "Min. ratio of insns to mem ops to enable prefetching in a loop",
+ 3, 0, 0)
+
+/* Set maximum hash table size for var tracking. */
+
+DEFPARAM (PARAM_MAX_VARTRACK_SIZE,
+ "max-vartrack-size",
+ "Max. size of var tracking hash tables",
+ 50000000, 0, 0)
+
+/* Set maximum recursion depth for var tracking expression expansion
+ and resolution. */
+
+DEFPARAM (PARAM_MAX_VARTRACK_EXPR_DEPTH,
+ "max-vartrack-expr-depth",
+ "Max. recursion depth for expanding var tracking expressions",
+ 12, 0, 0)
+
+/* Set maximum length of value location list for which var tracking
+ should add reverse operations. */
+
+DEFPARAM (PARAM_MAX_VARTRACK_REVERSE_OP_SIZE,
+ "max-vartrack-reverse-op-size",
+ "Max. size of loc list for which reverse ops should be added",
+ 50, 0, 0)
+
+/* Set minimum insn uid for non-debug insns. */
+
+DEFPARAM (PARAM_MIN_NONDEBUG_INSN_UID,
+ "min-nondebug-insn-uid",
+ "The minimum UID to be used for a nondebug insn",
+ 0, 1, 0)
+
+DEFPARAM (PARAM_IPA_SRA_PTR_GROWTH_FACTOR,
+ "ipa-sra-ptr-growth-factor",
+ "Maximum allowed growth of size of new parameters ipa-sra replaces "
+ "a pointer to an aggregate with",
+ 2, 0, 0)
+
+DEFPARAM (PARAM_TM_MAX_AGGREGATE_SIZE,
+ "tm-max-aggregate-size",
+ "Size in bytes after which thread-local aggregates should be "
+ "instrumented with the logging functions instead of save/restore "
+ "pairs",
+ 9, 0, 0)
+
+DEFPARAM (PARAM_IPA_CP_VALUE_LIST_SIZE,
+ "ipa-cp-value-list-size",
+ "Maximum size of a list of values associated with each parameter for "
+ "interprocedural constant propagation",
+ 8, 0, 0)
+
+DEFPARAM (PARAM_IPA_CP_EVAL_THRESHOLD,
+ "ipa-cp-eval-threshold",
+ "Threshold ipa-cp opportunity evaluation that is still considered "
+ "beneficial to clone.",
+ 500, 0, 0)
+
+DEFPARAM (PARAM_IPA_MAX_AGG_ITEMS,
+ "ipa-max-agg-items",
+ "Maximum number of aggregate content items for a parameter in "
+ "jump functions and lattices",
+ 16, 0, 0)
+
+DEFPARAM (PARAM_IPA_CP_LOOP_HINT_BONUS,
+ "ipa-cp-loop-hint-bonus",
+ "Compile-time bonus IPA-CP assigns to candidates which make loop "
+ "bounds or strides known.",
+ 64, 0, 0)
+
+DEFPARAM (PARAM_IPA_CP_ARRAY_INDEX_HINT_BONUS,
+ "ipa-cp-array-index-hint-bonus",
+ "Compile-time bonus IPA-CP assigns to candidates which make an array "
+ "index known.",
+ 48, 0, 0)
+
+/* WHOPR partitioning configuration. */
+
+DEFPARAM (PARAM_LTO_PARTITIONS,
+ "lto-partitions",
+ "Number of partitions the program should be split to",
+ 32, 1, 0)
+
+DEFPARAM (MIN_PARTITION_SIZE,
+ "lto-min-partition",
+ "Minimal size of a partition for LTO (in estimated instructions)",
+ 1000, 0, 0)
+
+/* Diagnostic parameters. */
+
+DEFPARAM (CXX_MAX_NAMESPACES_FOR_DIAGNOSTIC_HELP,
+ "cxx-max-namespaces-for-diagnostic-help",
+ "Maximum number of namespaces to search for alternatives when "
+ "name lookup fails",
+ 1000, 0, 0)
+
+/* Maximum number of conditional store pairs that can be sunk. */
+DEFPARAM (PARAM_MAX_STORES_TO_SINK,
+ "max-stores-to-sink",
+ "Maximum number of conditional store pairs that can be sunk",
+ 2, 0, 0)
+
+/* Override CASE_VALUES_THRESHOLD of when to switch from doing switch
+ statements via if statements to using a table jump operation. If the value
+ is 0, the default CASE_VALUES_THRESHOLD will be used. */
+DEFPARAM (PARAM_CASE_VALUES_THRESHOLD,
+ "case-values-threshold",
+ "The smallest number of different values for which it is best to "
+ "use a jump-table instead of a tree of conditional branches, "
+ "if 0, use the default for the machine",
+ 0, 0, 0)
+
+/* Data race flags for C++0x memory model compliance. */
+DEFPARAM (PARAM_ALLOW_LOAD_DATA_RACES,
+ "allow-load-data-races",
+ "Allow new data races on loads to be introduced",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_ALLOW_STORE_DATA_RACES,
+ "allow-store-data-races",
+ "Allow new data races on stores to be introduced",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_ALLOW_PACKED_LOAD_DATA_RACES,
+ "allow-packed-load-data-races",
+ "Allow new data races on packed data loads to be introduced",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_ALLOW_PACKED_STORE_DATA_RACES,
+ "allow-packed-store-data-races",
+ "Allow new data races on packed data stores to be introduced",
+ 1, 0, 1)
+
+/* Reassociation width to be used by tree reassoc optimization. */
+DEFPARAM (PARAM_TREE_REASSOC_WIDTH,
+ "tree-reassoc-width",
+ "Set the maximum number of instructions executed in parallel in "
+ "reassociated tree. If 0, use the target dependent heuristic.",
+ 0, 0, 0)
+
+DEFPARAM (PARAM_MAX_TAIL_MERGE_COMPARISONS,
+ "max-tail-merge-comparisons",
+ "Maximum amount of similar bbs to compare a bb with",
+ 10, 0, 0)
+
+DEFPARAM (PARAM_MAX_TAIL_MERGE_ITERATIONS,
+ "max-tail-merge-iterations",
+ "Maximum amount of iterations of the pass over a function",
+ 2, 0, 0)
+
+/* Maximum number of strings for which strlen optimization pass will
+ track string lenths. */
+DEFPARAM (PARAM_MAX_TRACKED_STRLENS,
+ "max-tracked-strlens",
+ "Maximum number of strings for which strlen optimization pass will "
+ "track string lengths",
+ 1000, 0, 0)
+
+/* Keep this in sync with the sched_pressure_algorithm enum. */
+DEFPARAM (PARAM_SCHED_PRESSURE_ALGORITHM,
+ "sched-pressure-algorithm",
+ "Which -fsched-pressure algorithm to apply",
+ 1, 1, 2)
+
+/* Maximum length of candidate scans in straight-line strength reduction. */
+DEFPARAM (PARAM_MAX_SLSR_CANDIDATE_SCAN,
+ "max-slsr-cand-scan",
+ "Maximum length of candidate scans for straight-line "
+ "strength reduction",
+ 50, 1, 999999)
+
+DEFPARAM (PARAM_ASAN_STACK,
+ "asan-stack",
+ "Enable asan stack protection",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_ASAN_GLOBALS,
+ "asan-globals",
+ "Enable asan globals protection",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_ASAN_INSTRUMENT_WRITES,
+ "asan-instrument-writes",
+ "Enable asan store operations protection",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_ASAN_INSTRUMENT_READS,
+ "asan-instrument-reads",
+ "Enable asan load operations protection",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_ASAN_MEMINTRIN,
+ "asan-memintrin",
+ "Enable asan builtin functions protection",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_ASAN_USE_AFTER_RETURN,
+ "asan-use-after-return",
+ "Enable asan builtin functions protection",
+ 1, 0, 1)
+
+DEFPARAM (PARAM_UNINIT_CONTROL_DEP_ATTEMPTS,
+ "uninit-control-dep-attempts",
+ "Maximum number of nested calls to search for control dependencies "
+ "during uninitialized variable analysis",
+ 1000, 1, 0)
+/*
+
+Local variables:
+mode:c
+End:
+*/