/* params.def - Run-time parameters.
- Copyright (C) 2001, 2002, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
Written by Mark Mitchell <mark@codesourcery.com>.
This file is part of GCC.
Be sure to add an entry to invoke.texi summarizing the parameter. */
+/* The maximum number of fields in a variable with only implicit uses
+ for which structure aliasing will consider trying to track each
+ field. The default is 5. */
+DEFPARAM (PARAM_SALIAS_MAX_IMPLICIT_FIELDS,
+ "salias-max-implicit-fields",
+ "The maximum number of fields in a structure variable without direct structure accesses that GCC will attempt to track separately",
+ 5, 0, 0)
+
+/* The maximum structure size at which the scalar replacement of
+ aggregates (SRA) pass will perform block copies. The default
+ value, 0, implies that GCC will select the most appropriate size
+ itself. */
+DEFPARAM (PARAM_SRA_MAX_STRUCTURE_SIZE,
+ "sra-max-structure-size",
+ "The maximum structure size (in bytes) at which GCC will do block copies",
+ 0, 0, 0)
+
+/* The ratio between instantiated fields and the complete structure
+ size. We say that if the ratio of the number of bytes in
+ instantiated fields to the number of bytes in the complete
+ structure exceeds this parameter, then block copies are not used.
+ The default is 75%. */
+DEFPARAM (PARAM_SRA_FIELD_STRUCTURE_RATIO,
+ "sra-field-structure-ratio",
+ "The threshold ratio between instantiated fields and the total structure size",
+ 75, 0, 100)
+
/* 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 500.
+ The default value is 450.
Only functions marked inline (or methods defined in the class
- definition for C++) are affected by this, unless you set the
- -finline-functions (included in -O3) compiler option.
+ 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
DEFPARAM (PARAM_MAX_INLINE_INSNS_SINGLE,
"max-inline-insns-single",
"The maximum number of instructions in a single function eligible for inlining",
- 500)
+ 450, 0, 0)
/* The single function inlining limit for functions that are
inlined by virtue of -finline-functions (-O3).
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 150. */
+ The default value is 90. */
DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO,
"max-inline-insns-auto",
"The maximum number of instructions when automatically inlining",
- 120)
+ 90, 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",
- 500)
+ 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",
- 500)
+ 450, 0, 0)
DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH,
"max-inline-recursive-depth",
"The maximum depth of recursive inlining for inline functions",
- 8)
+ 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)
-
-/* For languages that (still) use the RTL inliner, we can specify
- limits for the RTL inliner separately.
- The parameter here defines the maximum number of RTL instructions
- a function may have to be eligible for inlining in the RTL inliner.
- The default value is 600. */
-DEFPARAM (PARAM_MAX_INLINE_INSNS_RTL,
- "max-inline-insns-rtl",
- "The maximum number of instructions for the RTL inliner",
- 600)
+ 8, 0, 0)
/* Limit the number of expansions created by the variable expansion
optimization to avoid register pressure. */
"If -fvariable-expansion-in-unroller is used, the maximum number of \
times that an individual variable will be expanded \
during loop unrolling",
- 1)
+ 1, 0, 0)
/* The maximum number of instructions to consider when looking for an
instruction to fill a delay slot. If more than this arbitrary
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)
+ 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
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)
+ 333, 0, 0)
/* This parameter limits the number of branch elements that the
scheduler will track anti-dependencies through without resetting
DEFPARAM(PARAM_MAX_PENDING_LIST_LENGTH,
"max-pending-list-length",
"The maximum length of scheduling's pending operations list",
- 32)
+ 32, 0, 0)
DEFPARAM(PARAM_LARGE_FUNCTION_INSNS,
"large-function-insns",
"The size of function body to be considered large",
- 3000)
+ 2700, 0, 0)
DEFPARAM(PARAM_LARGE_FUNCTION_GROWTH,
"large-function-growth",
"Maximal growth due to inlining of large function (in percent)",
- 100)
+ 100, 0, 0)
DEFPARAM(PARAM_INLINE_UNIT_GROWTH,
"inline-unit-growth",
"how much can given compilation unit grow because of the inlining (in percent)",
- 50)
+ 50, 0, 0)
+DEFPARAM(PARAM_INLINE_CALL_COST,
+ "inline-call-cost",
+ "expense of call operation relative to ordinary arithmetic operations",
+ 16, 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)
+ 50 * 1024 * 1024, 0, 0)
/* The number of repetitions of copy/const prop and PRE to run. */
DEFPARAM(PARAM_MAX_GCSE_PASSES,
"max-gcse-passes",
"The maximum number of passes to make when doing GCSE",
- 1)
+ 1, 1, 0)
/* This is the threshold ratio when to perform partial redundancy
elimination after reload. We perform partial redundancy elimination
when the following holds:
(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)
+ "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)
+ "The threshold ratio of critical edges execution count that permit performing redundancy elimination after reload.",
+ 10, 0, 0)
/* This parameter limits the number of insns in a loop that will be unrolled,
and by how much the loop is unrolled.
DEFPARAM(PARAM_MAX_UNROLLED_INSNS,
"max-unrolled-insns",
"The maximum number of instructions to consider to unroll in a loop",
- 200)
+ 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)
+ 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)
+ 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)
+ 400, 0, 0)
/* The maximum number of peelings of a single loop. */
DEFPARAM(PARAM_MAX_PEEL_TIMES,
"max-peel-times",
"The maximum number of peelings of a single loop",
- 16)
+ 16, 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)
+ 400, 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)
+ 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)
+ 400, 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)
+ 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)
+ 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)
+ "Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates",
+ 1000, 0, 0)
DEFPARAM(PARAM_MAX_SMS_LOOP_NUMBER,
"max-sms-loop-number",
- "Maximum number of loops to perform swing modulo scheduling on \
- (mainly for debugging)",
- -1)
-
+ "Maximum number of loops to perform swing modulo scheduling on (mainly for debugging)",
+ -1, -1, -1)
+
/* 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)
+ "A factor for tuning the upper bound that swing modulo scheduler uses for scheduling a loop",
+ 100, 0, 0)
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, 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)
+ "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",
- 10000)
+ "Select fraction of the maximal count of repetitions of basic block in program given basic block needs to have to be considered hot",
+ 10000, 0, 0)
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)
+ "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(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)
+ "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)
+ "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)
+ 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)
+ "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)
+ "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)
+ "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)
+ 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)
+ 5, 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)
+ 10, 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)
+ 20, 0, 0)
/* Bound on number of candidates for induction variables below that
all candidates are considered for each use in induction variable
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)
+ 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)
+ 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)
/* The product of the next two is used to decide whether or not to
use .GLOBAL_VAR. See tree-dfa.c. */
DEFPARAM(PARAM_GLOBAL_VAR_THRESHOLD,
"global-var-threshold",
"Given N calls and V call-clobbered vars in a function. Use .GLOBAL_VAR if NxV is larger than this limit",
- 500000)
+ 500000, 0, 0)
DEFPARAM(PARAM_MAX_CSELIB_MEMORY_LOCATIONS,
"max-cselib-memory-locations",
"The maximum memory locations recorded by cselib",
- 500)
+ 500, 0, 0)
#ifdef ENABLE_GC_ALWAYS_COLLECT
# define GGC_MIN_EXPAND_DEFAULT 0
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)
+ "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)
+ 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)
+ 100, 0, 0)
DEFPARAM(PARAM_MAX_ALIASED_VOPS,
"max-aliased-vops",
"The maximum number of virtual operands allowed to represent aliases before triggering alias grouping.",
- 500)
+ 500, 0, 0)
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)
+ 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)
+ 100, 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.
DEFPARAM (PARAM_INTEGER_SHARE_LIMIT,
"integer-share-limit",
"The upper bound for sharing integer constants",
- 256)
+ 256, 2, 2)
/*
Local variables:
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