/* params.def - Run-time parameters.
- Copyright (C) 2001 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 number of instructions accepted for inlining a
- function. Increasing values mean more agressive inlining.
- This affects currently only functions explicitly marked as
- inline (or methods defined within the class definition for C++).
- The original default value of 10000 was arbitrary and caused
- significant compile-time performance regressions. */
-DEFPARAM (PARAM_MAX_INLINE_INSNS,
- "max-inline-insns",
- "The maximum number of instructions in a function that is eligible for inlining",
+/* 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.
+ 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.
+ 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",
+ 500)
+
+/* 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 150. */
+DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO,
+ "max-inline-insns-auto",
+ "The maximum number of instructions when automatically inlining",
+ 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)
+
+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 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)
/* The maximum number of instructions to consider when looking for an
333)
/* This parameter limits the number of branch elements that the
- scheduler will track anti-dependancies through without resetting
+ 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 dependancies. Generally
+ 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)
+DEFPARAM(PARAM_LARGE_FUNCTION_INSNS,
+ "large-function-insns",
+ "The size of function body to be considered large",
+ 3000)
+DEFPARAM(PARAM_LARGE_FUNCTION_GROWTH,
+ "large-function-growth",
+ "Maximal growth due to inlining of large function (in percent)",
+ 100)
+DEFPARAM(PARAM_INLINE_UNIT_GROWTH,
+ "inline-unit-growth",
+ "how much can given compilation unit grow because of the inlining (in percent)",
+ 50)
+
/* 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)
-/* The number of repetitions of copy/const prop and PRE to run. */
+/* 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)
+/* 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.
+
+ 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)
+/* 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)
+/* 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)
+/* 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)
+/* 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)
+/* 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)
+/* 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)
+/* 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)
+
+/* 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)
+/* 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)
+
+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 \
+program given basic block needs to have to be considered hot",
+ 10000)
+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)
+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)
+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)
+DEFPARAM(TRACER_MAX_CODE_GROWTH,
+ "tracer-max-code-growth",
+ "Maximal code growth caused by tail duplication (in percent)",
+ 100)
+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)
+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)
+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)
+
+/* 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)
+
+/* 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 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
+#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)
+
+DEFPARAM(GGC_MIN_HEAPSIZE,
+ "ggc-min-heapsize",
+ "Minimum heap size before we start collecting garbage, in kilobytes",
+ GGC_MIN_HEAPSIZE_DEFAULT)
+
+#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)
+
/*
Local variables:
mode:c
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