/* params.def - Run-time parameters.
- Copyright (C) 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2004 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 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)
+
+/* 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)
+
/* 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 100.
+ The default value is 500.
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.
DEFPARAM (PARAM_MAX_INLINE_INSNS_SINGLE,
"max-inline-insns-single",
"The maximum number of instructions in a single function eligible for inlining",
- 100)
+ 500)
/* 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 100. */
+ The default value is 150. */
DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO,
"max-inline-insns-auto",
"The maximum number of instructions when automatically inlining",
- 100)
+ 120)
+
+DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE,
+ "max-inline-insns-recursive",
+ "The maximum number of instructions inline function can grow to via recursive inlining",
+ 500)
+
+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)
-/* The repeated inlining limit. After this number of instructions
- (in the internal gcc representation, not real machine instructions)
- got inlined by repeated inlining, gcc starts to decrease the maximum
- number of inlinable instructions in the tree inliner.
- This is done by a linear function, see "max-inline-slope" parameter.
- It is necessary in order to limit the compile-time resources, that
- could otherwise become very high.
- It is recommended to set this value to twice the value of the single
- function limit (set by the "max-inline-insns-single" parameter) or
- higher. The default value is 200.
- Higher values mean that more inlining is done, resulting in
- better performance of the code, at the expense of higher
- compile-time resource (time, memory) requirements and larger
- binaries. */
-DEFPARAM (PARAM_MAX_INLINE_INSNS,
- "max-inline-insns",
- "The maximum number of instructions by repeated inlining before gcc starts to throttle inlining",
- 200)
-
-/* After the repeated inline limit has been exceeded (see
- "max-inline-insns" parameter), a linear function is used to
- decrease the size of single functions eligible for inlining.
- The slope of this linear function is given the negative
- reciprocal value (-1/x) of this parameter.
- The default value is 32.
- This linear function is used until it falls below a minimum
- value specified by the "min-inline-insns" parameter. */
-DEFPARAM (PARAM_MAX_INLINE_SLOPE,
- "max-inline-slope",
- "The slope of the linear function throttling inlining after the recursive inlining limit has been reached is given by the negative reciprocal value of this parameter",
- 32)
-
-/* When gcc has inlined so many instructions (by repeated
- inlining) that the throttling limits the inlining very much,
- inlining for very small functions is still desirable to
- achieve good runtime performance. The size of single functions
- (measured in gcc instructions) which will still be eligible for
- inlining then is given by this parameter. It defaults to 130.
- Only much later (after exceeding 128 times the recursive limit)
- inlining is cut down completely. */
-DEFPARAM (PARAM_MIN_INLINE_INSNS,
- "min-inline-insns",
- "The number of instructions in a single functions still eligible to inlining after a lot recursive inlining",
- 10)
+DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH,
+ "max-inline-recursive-depth",
+ "The maximum depth of recursive inlining for inline functions",
+ 8)
+
+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 maximum number of instructions for the RTL inliner",
600)
+/* 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)
+
/* 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
DEFPARAM(PARAM_LARGE_FUNCTION_INSNS,
"large-function-insns",
"The size of function body to be considered large",
- 10000)
+ 3000)
DEFPARAM(PARAM_LARGE_FUNCTION_GROWTH,
"large-function-growth",
"Maximal growth due to inlining of large function (in percent)",
"max-gcse-passes",
"The maximum number of passes to make when doing GCSE",
1)
-
+/* 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)
+/* 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)
/* This parameter limits the number of insns in a loop that will be unrolled,
- and by how much the loop is 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",
DEFPARAM(PARAM_MAX_PEELED_INSNS,
"max-peeled-insns",
"The maximum number of insns of a peeled loop",
- 120)
+ 400)
/* The maximum number of peelings of a single loop. */
DEFPARAM(PARAM_MAX_PEEL_TIMES,
"max-peel-times",
DEFPARAM(PARAM_MAX_COMPLETELY_PEELED_INSNS,
"max-completely-peeled-insns",
"The maximum number of insns of a completely peeled loop",
- 120)
+ 400)
/* The maximum number of peelings of a single loop that is peeled completely. */
DEFPARAM(PARAM_MAX_COMPLETELY_PEEL_TIMES,
"max-completely-peel-times",
DEFPARAM(PARAM_MAX_ONCE_PEELED_INSNS,
"max-once-peeled-insns",
"The maximum number of insns of a peeled loop that rolls only once",
- 200)
+ 400)
/* The maximum number of insns of an unswitched loop. */
DEFPARAM(PARAM_MAX_UNSWITCH_INSNS,
"The maximum number of unswitchings in a single loop",
3)
+/* 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)
+
+DEFPARAM(PARAM_MAX_SMS_LOOP_NUMBER,
+ "max-sms-loop-number",
+ "Maximum number of loops to perform swing modulo scheduling on \
+ (mainly for debugging)",
+ -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)
+DEFPARAM(PARAM_SMS_DFA_HISTORY,
+ "sms-dfa-history",
+ "The number of cycles the swing modulo scheduler considers when \
+ checking conflicts using DFA",
+ 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)
+
DEFPARAM(HOT_BB_COUNT_FRACTION,
"hot-bb-count-fraction",
"Select fraction of the maximal count of repetitions of basic block in \
"The maximum number of incoming edges to consider for crossjumping",
100)
+/* 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)
+
/* 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)
+/* 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)
+
+/* 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)
+
+/* 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)
+
+/* 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)
+
+DEFPARAM(PARAM_MAX_CSELIB_MEMORY_LOCATIONS,
+ "max-cselib-memory-locations",
+ "The maximum memory locations recorded by cselib",
+ 500)
+
#ifdef ENABLE_GC_ALWAYS_COLLECT
# define GGC_MIN_EXPAND_DEFAULT 0
# define GGC_MIN_HEAPSIZE_DEFAULT 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)
+
+DEFPARAM(PARAM_MAX_ALIASED_VOPS,
+ "max-aliased-vops",
+ "The maximum number of virtual operands allowed to represent aliases before triggering alias grouping.",
+ 500)
+
+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)
+
+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)
+
+/* 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. */
+DEFPARAM (PARAM_INTEGER_SHARE_LIMIT,
+ "integer-share-limit",
+ "The upper bound for sharing integer constants",
+ 256)
+
/*
Local variables:
mode:c
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