1/* params.def - Run-time parameters.
2 Copyright (C) 2001-2017 Free Software Foundation, Inc.
3 Written by Mark Mitchell <mark@codesourcery.com>.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 3, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING3. If not see
19<http://www.gnu.org/licenses/>. */
20
21/* This file contains definitions for language-independent
22 parameters. The DEFPARAM macro takes 6 arguments:
23
24 - The enumeral corresponding to this parameter.
25
26 - The name that can be used to set this parameter using the
27 command-line option `--param <name>=<value>'.
28
29 - A help string explaining how the parameter is used.
30
31 - A default value for the parameter.
32
33 - The minimum acceptable value for the parameter.
34
35 - The maximum acceptable value for the parameter (if greater than
36 the minimum).
37
38 The DEFPARAMENUM<N> macro is similar, but instead of the minumum and maximum
39 arguments, it contains a list of <N> allowed strings, corresponding to
40 integer values 0..<N>-1. Note that the default argument needs to be
41 specified as one of the allowed strings, rather than an integer value.
42
43 Be sure to add an entry to invoke.texi summarizing the parameter. */
44
45/* When branch is predicted to be taken with probability lower than this
46 threshold (in percent), then it is considered well predictable. */
47DEFPARAM (PARAM_PREDICTABLE_BRANCH_OUTCOME,
48 "predictable-branch-outcome",
49 "Maximal estimated outcome of branch considered predictable.",
50 2, 0, 50)
51
52DEFPARAM (PARAM_INLINE_MIN_SPEEDUP,
53 "inline-min-speedup",
54 "The minimal estimated speedup allowing inliner to ignore inline-insns-single and inline-insns-auto.",
55 8, 0, 0)
56
57/* The single function inlining limit. This is the maximum size
58 of a function counted in internal gcc instructions (not in
59 real machine instructions) that is eligible for inlining
60 by the tree inliner.
61 The default value is 450.
62 Only functions marked inline (or methods defined in the class
63 definition for C++) are affected by this.
64 There are more restrictions to inlining: If inlined functions
65 call other functions, the already inlined instructions are
66 counted and once the recursive inline limit (see
67 "max-inline-insns" parameter) is exceeded, the acceptable size
68 gets decreased. */
69DEFPARAM (PARAM_MAX_INLINE_INSNS_SINGLE,
70 "max-inline-insns-single",
71 "The maximum number of instructions in a single function eligible for inlining.",
72 400, 0, 0)
73
74/* The single function inlining limit for functions that are
75 inlined by virtue of -finline-functions (-O3).
76 This limit should be chosen to be below or equal to the limit
77 that is applied to functions marked inlined (or defined in the
78 class declaration in C++) given by the "max-inline-insns-single"
79 parameter.
80 The default value is 40. */
81DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO,
82 "max-inline-insns-auto",
83 "The maximum number of instructions when automatically inlining.",
84 40, 0, 0)
85
86DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE,
87 "max-inline-insns-recursive",
88 "The maximum number of instructions inline function can grow to via recursive inlining.",
89 450, 0, 0)
90
91DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO,
92 "max-inline-insns-recursive-auto",
93 "The maximum number of instructions non-inline function can grow to via recursive inlining.",
94 450, 0, 0)
95
96DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH,
97 "max-inline-recursive-depth",
98 "The maximum depth of recursive inlining for inline functions.",
99 8, 0, 0)
100
101DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO,
102 "max-inline-recursive-depth-auto",
103 "The maximum depth of recursive inlining for non-inline functions.",
104 8, 0, 0)
105
106DEFPARAM (PARAM_MIN_INLINE_RECURSIVE_PROBABILITY,
107 "min-inline-recursive-probability",
108 "Inline recursively only when the probability of call being executed exceeds the parameter.",
109 10, 0, 0)
110
111/* Limit of iterations of early inliner. This basically bounds number of
112 nested indirect calls early inliner can resolve. Deeper chains are still
113 handled by late inlining. */
114DEFPARAM (PARAM_EARLY_INLINER_MAX_ITERATIONS,
115 "max-early-inliner-iterations",
116 "The maximum number of nested indirect inlining performed by early inliner.",
117 1, 0, 0)
118
119/* Limit on probability of entry BB. */
120DEFPARAM (PARAM_COMDAT_SHARING_PROBABILITY,
121 "comdat-sharing-probability",
122 "Probability that COMDAT function will be shared with different compilation unit.",
123 20, 0, 0)
124
125/* Limit on probability of entry BB. */
126DEFPARAM (PARAM_PARTIAL_INLINING_ENTRY_PROBABILITY,
127 "partial-inlining-entry-probability",
128 "Maximum probability of the entry BB of split region (in percent relative to entry BB of the function) to make partial inlining happen.",
129 70, 0, 100)
130
131/* Limit the number of expansions created by the variable expansion
132 optimization to avoid register pressure. */
133DEFPARAM (PARAM_MAX_VARIABLE_EXPANSIONS,
134 "max-variable-expansions-in-unroller",
135 "If -fvariable-expansion-in-unroller is used, the maximum number of times that an individual variable will be expanded during loop unrolling.",
136 1, 0, 0)
137
138/* Limit loop autovectorization to loops with large enough iteration count. */
139DEFPARAM (PARAM_MIN_VECT_LOOP_BOUND,
140 "min-vect-loop-bound",
141 "If -ftree-vectorize is used, the minimal loop bound of a loop to be considered for vectorization.",
142 1, 1, 0)
143
144/* The maximum number of instructions to consider when looking for an
145 instruction to fill a delay slot. If more than this arbitrary
146 number of instructions is searched, the time savings from filling
147 the delay slot will be minimal so stop searching. Increasing
148 values mean more aggressive optimization, making the compile time
149 increase with probably small improvement in executable run time. */
150DEFPARAM (PARAM_MAX_DELAY_SLOT_INSN_SEARCH,
151 "max-delay-slot-insn-search",
152 "The maximum number of instructions to consider to fill a delay slot.",
153 100, 0, 0)
154
155/* When trying to fill delay slots, the maximum number of instructions
156 to consider when searching for a block with valid live register
157 information. Increasing this arbitrarily chosen value means more
158 aggressive optimization, increasing the compile time. This
159 parameter should be removed when the delay slot code is rewritten
160 to maintain the control-flow graph. */
161DEFPARAM(PARAM_MAX_DELAY_SLOT_LIVE_SEARCH,
162 "max-delay-slot-live-search",
163 "The maximum number of instructions to consider to find accurate live register information.",
164 333, 0, 0)
165
166/* This parameter limits the number of branch elements that the
167 scheduler will track anti-dependencies through without resetting
168 the tracking mechanism. Large functions with few calls or barriers
169 can generate lists containing many 1000's of dependencies. Generally
170 the compiler either uses all available memory, or runs for far too long. */
171DEFPARAM(PARAM_MAX_PENDING_LIST_LENGTH,
172 "max-pending-list-length",
173 "The maximum length of scheduling's pending operations list.",
174 32, 0, 0)
175
176/* This parameter limits the number of backtracking attempts when using the
177 haifa scheduler for modulo scheduling. */
178DEFPARAM(PARAM_MAX_MODULO_BACKTRACK_ATTEMPTS,
179 "max-modulo-backtrack-attempts",
180 "The maximum number of backtrack attempts the scheduler should make when modulo scheduling a loop.",
181 40, 0, 0)
182
183DEFPARAM(PARAM_LARGE_FUNCTION_INSNS,
184 "large-function-insns",
185 "The size of function body to be considered large.",
186 2700, 0, 0)
187DEFPARAM(PARAM_LARGE_FUNCTION_GROWTH,
188 "large-function-growth",
189 "Maximal growth due to inlining of large function (in percent).",
190 100, 0, 0)
191DEFPARAM(PARAM_LARGE_UNIT_INSNS,
192 "large-unit-insns",
193 "The size of translation unit to be considered large.",
194 10000, 0, 0)
195DEFPARAM(PARAM_INLINE_UNIT_GROWTH,
196 "inline-unit-growth",
197 "How much can given compilation unit grow because of the inlining (in percent).",
198 20, 0, 0)
199DEFPARAM(PARAM_IPCP_UNIT_GROWTH,
200 "ipcp-unit-growth",
201 "How much can given compilation unit grow because of the interprocedural constant propagation (in percent).",
202 10, 0, 0)
203DEFPARAM(PARAM_EARLY_INLINING_INSNS,
204 "early-inlining-insns",
205 "Maximal estimated growth of function body caused by early inlining of single call.",
206 14, 0, 0)
207DEFPARAM(PARAM_LARGE_STACK_FRAME,
208 "large-stack-frame",
209 "The size of stack frame to be considered large.",
210 256, 0, 0)
211DEFPARAM(PARAM_STACK_FRAME_GROWTH,
212 "large-stack-frame-growth",
213 "Maximal stack frame growth due to inlining (in percent).",
214 1000, 0, 0)
215
216DEFPARAM(PARAM_STACK_CLASH_PROTECTION_GUARD_SIZE,
217 "stack-clash-protection-guard-size",
218 "Size of the stack guard expressed as a power of two.",
219 12, 12, 30)
220
221DEFPARAM(PARAM_STACK_CLASH_PROTECTION_PROBE_INTERVAL,
222 "stack-clash-protection-probe-interval",
223 "Interval in which to probe the stack expressed as a power of two.",
224 12, 10, 16)
225
226/* The GCSE optimization will be disabled if it would require
227 significantly more memory than this value. */
228DEFPARAM(PARAM_MAX_GCSE_MEMORY,
229 "max-gcse-memory",
230 "The maximum amount of memory to be allocated by GCSE.",
231 128 * 1024 * 1024, 0, 0)
232
233/* The GCSE optimization of an expression will avoided if the ratio of
234 insertions to deletions is greater than this value. */
235DEFPARAM(PARAM_MAX_GCSE_INSERTION_RATIO,
236 "max-gcse-insertion-ratio",
237 "The maximum ratio of insertions to deletions of expressions in GCSE.",
238 20, 0, 0)
239
240/* This is the threshold ratio when to perform partial redundancy
241 elimination after reload. We perform partial redundancy elimination
242 when the following holds:
243 (Redundant load execution count)
244 ------------------------------- >= GCSE_AFTER_RELOAD_PARTIAL_FRACTION
245 (Added loads execution count) */
246DEFPARAM(PARAM_GCSE_AFTER_RELOAD_PARTIAL_FRACTION,
247 "gcse-after-reload-partial-fraction",
248 "The threshold ratio for performing partial redundancy elimination after reload.",
249 3, 0, 0)
250/* This is the threshold ratio of the critical edges execution count compared to
251 the redundant loads execution count that permits performing the load
252 redundancy elimination in gcse after reload. */
253DEFPARAM(PARAM_GCSE_AFTER_RELOAD_CRITICAL_FRACTION,
254 "gcse-after-reload-critical-fraction",
255 "The threshold ratio of critical edges execution count that permit performing redundancy elimination after reload.",
256 10, 0, 0)
257
258/* GCSE will use GCSE_COST_DISTANCE_RATION as a scaling factor
259 to calculate maximum distance for which an expression is allowed to move
260 from its rtx_cost. */
261DEFPARAM(PARAM_GCSE_COST_DISTANCE_RATIO,
262 "gcse-cost-distance-ratio",
263 "Scaling factor in calculation of maximum distance an expression can be moved by GCSE optimizations.",
264 10, 0, 0)
265/* GCSE won't restrict distance for which an expression with rtx_cost greater
266 than COSTS_N_INSN(GCSE_UNRESTRICTED_COST) is allowed to move. */
267DEFPARAM(PARAM_GCSE_UNRESTRICTED_COST,
268 "gcse-unrestricted-cost",
269 "Cost at which GCSE optimizations will not constraint the distance an expression can travel.",
270 3, 0, 0)
271
272/* How deep from a given basic block the dominator tree should be searched
273 for expressions to hoist to the block. The value of 0 will avoid limiting
274 the search. */
275DEFPARAM(PARAM_MAX_HOIST_DEPTH,
276 "max-hoist-depth",
277 "Maximum depth of search in the dominator tree for expressions to hoist.",
278 30, 0, 0)
279
280
281/* When synthesizing expnonentiation by a real constant operations using square
282 roots, this controls how deep sqrt chains we are willing to generate. */
283DEFPARAM(PARAM_MAX_POW_SQRT_DEPTH,
284 "max-pow-sqrt-depth",
285 "Maximum depth of sqrt chains to use when synthesizing exponentiation by a real constant.",
286 5, 1, 32)
287
288/* This parameter limits the number of insns in a loop that will be unrolled,
289 and by how much the loop is unrolled.
290
291 This limit should be at most half of the peeling limits: loop unroller
292 decides to not unroll loops that iterate fewer than 2*number of allowed
293 unrollings and thus we would have loops that are neither peeled or unrolled
294 otherwise. */
295DEFPARAM(PARAM_MAX_UNROLLED_INSNS,
296 "max-unrolled-insns",
297 "The maximum number of instructions to consider to unroll in a loop.",
298 200, 0, 0)
299/* This parameter limits how many times the loop is unrolled depending
300 on number of insns really executed in each iteration. */
301DEFPARAM(PARAM_MAX_AVERAGE_UNROLLED_INSNS,
302 "max-average-unrolled-insns",
303 "The maximum number of instructions to consider to unroll in a loop on average.",
304 80, 0, 0)
305/* The maximum number of unrollings of a single loop. */
306DEFPARAM(PARAM_MAX_UNROLL_TIMES,
307 "max-unroll-times",
308 "The maximum number of unrollings of a single loop.",
309 8, 0, 0)
310/* The maximum number of insns of a peeled loop. */
311DEFPARAM(PARAM_MAX_PEELED_INSNS,
312 "max-peeled-insns",
313 "The maximum number of insns of a peeled loop.",
314 100, 0, 0)
315/* The maximum number of peelings of a single loop. */
316DEFPARAM(PARAM_MAX_PEEL_TIMES,
317 "max-peel-times",
318 "The maximum number of peelings of a single loop.",
319 16, 0, 0)
320/* The maximum number of peelings of a single loop that is peeled completely. */
321DEFPARAM(PARAM_MAX_PEEL_BRANCHES,
322 "max-peel-branches",
323 "The maximum number of branches on the path through the peeled sequence.",
324 32, 0, 0)
325/* The maximum number of insns of a peeled loop. */
326DEFPARAM(PARAM_MAX_COMPLETELY_PEELED_INSNS,
327 "max-completely-peeled-insns",
328 "The maximum number of insns of a completely peeled loop.",
329 200, 0, 0)
330/* The maximum number of peelings of a single loop that is peeled completely. */
331DEFPARAM(PARAM_MAX_COMPLETELY_PEEL_TIMES,
332 "max-completely-peel-times",
333 "The maximum number of peelings of a single loop that is peeled completely.",
334 16, 0, 0)
335/* The maximum number of insns of a peeled loop that rolls only once. */
336DEFPARAM(PARAM_MAX_ONCE_PEELED_INSNS,
337 "max-once-peeled-insns",
338 "The maximum number of insns of a peeled loop that rolls only once.",
339 400, 0, 0)
340/* The maximum depth of a loop nest we completely peel. */
341DEFPARAM(PARAM_MAX_UNROLL_ITERATIONS,
342 "max-completely-peel-loop-nest-depth",
343 "The maximum depth of a loop nest we completely peel.",
344 8, 0, 0)
345
346/* The maximum number of insns of an unswitched loop. */
347DEFPARAM(PARAM_MAX_UNSWITCH_INSNS,
348 "max-unswitch-insns",
349 "The maximum number of insns of an unswitched loop.",
350 50, 0, 0)
351/* The maximum level of recursion in unswitch_single_loop. */
352DEFPARAM(PARAM_MAX_UNSWITCH_LEVEL,
353 "max-unswitch-level",
354 "The maximum number of unswitchings in a single loop.",
355 3, 0, 0)
356
357/* The maximum number of insns in loop header duplicated by he copy loop
358 headers pass. */
359DEFPARAM(PARAM_MAX_LOOP_HEADER_INSNS,
360 "max-loop-header-insns",
361 "The maximum number of insns in loop header duplicated by he copy loop headers pass.",
362 20, 0, 0)
363
364/* The maximum number of iterations of a loop the brute force algorithm
365 for analysis of # of iterations of the loop tries to evaluate. */
366DEFPARAM(PARAM_MAX_ITERATIONS_TO_TRACK,
367 "max-iterations-to-track",
368 "Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates.",
369 1000, 0, 0)
370/* A cutoff to avoid costly computations of the number of iterations in
371 the doloop transformation. */
372DEFPARAM(PARAM_MAX_ITERATIONS_COMPUTATION_COST,
373 "max-iterations-computation-cost",
374 "Bound on the cost of an expression to compute the number of iterations.",
375 10, 0, 0)
376
377/* This parameter is used to tune SMS MAX II calculations. */
378DEFPARAM(PARAM_SMS_MAX_II_FACTOR,
379 "sms-max-ii-factor",
380 "A factor for tuning the upper bound that swing modulo scheduler uses for scheduling a loop.",
381 100, 0, 0)
382/* The minimum value of stage count that swing modulo scheduler will generate. */
383DEFPARAM(PARAM_SMS_MIN_SC,
384 "sms-min-sc",
385 "The minimum value of stage count that swing modulo scheduler will generate.",
386 2, 1, 1)
387DEFPARAM(PARAM_SMS_DFA_HISTORY,
388 "sms-dfa-history",
389 "The number of cycles the swing modulo scheduler considers when checking conflicts using DFA.",
390 0, 0, 0)
391DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD,
392 "sms-loop-average-count-threshold",
393 "A threshold on the average loop count considered by the swing modulo scheduler.",
394 0, 0, 0)
395
396DEFPARAM(HOT_BB_COUNT_WS_PERMILLE,
397 "hot-bb-count-ws-permille",
398 "A basic block profile count is considered hot if it contributes to "
399 "the given permillage of the entire profiled execution.",
400 999, 0, 1000)
401DEFPARAM(HOT_BB_FREQUENCY_FRACTION,
402 "hot-bb-frequency-fraction",
403 "Select fraction of the maximal frequency of executions of basic block in function given basic block needs to have to be considered hot.",
404 1000, 0, 0)
405
406DEFPARAM(UNLIKELY_BB_COUNT_FRACTION,
407 "unlikely-bb-count-fraction",
408 "The minimum fraction of profile runs a given basic block execution count must be not to be considered unlikely.",
409 20, 1, 10000)
410
411DEFPARAM (PARAM_ALIGN_THRESHOLD,
412 "align-threshold",
413 "Select fraction of the maximal frequency of executions of basic block in function given basic block get alignment.",
414 100, 1, 0)
415
416DEFPARAM (PARAM_ALIGN_LOOP_ITERATIONS,
417 "align-loop-iterations",
418 "Loops iterating at least selected number of iterations will get loop alignment..",
419 4, 0, 0)
420
421/* For guessed profiles, the loops having unknown number of iterations
422 are predicted to iterate relatively few (10) times at average.
423 For functions containing one loop with large known number of iterations
424 and other loops having unbounded loops we would end up predicting all
425 the other loops cold that is not usually the case. So we need to artificially
426 flatten the profile.
427
428 We need to cut the maximal predicted iterations to large enough iterations
429 so the loop appears important, but safely within maximum hotness
430 range. */
431
432DEFPARAM(PARAM_MAX_PREDICTED_ITERATIONS,
433 "max-predicted-iterations",
434 "The maximum number of loop iterations we predict statically.",
435 100, 0, 0)
436
437/* This parameter controls the probability of builtin_expect. The default
438 value is 90%. This empirical value is obtained through the weighted
439 probability of FDO counters (with the FDO count value as the weight)
440 in some real world programs:
441 (1) Google performance test benchmarks: the probability is 0.9081.
442 (2) Linux 3.3 kernel running Google search workload: the probability
443 is 0.8717. */
444
445DEFPARAM(BUILTIN_EXPECT_PROBABILITY,
446 "builtin-expect-probability",
447 "Set the estimated probability in percentage for builtin expect. The default value is 90% probability.",
448 90, 0, 100)
449DEFPARAM(TRACER_DYNAMIC_COVERAGE_FEEDBACK,
450 "tracer-dynamic-coverage-feedback",
451 "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is available.",
452 95, 0, 100)
453DEFPARAM(TRACER_DYNAMIC_COVERAGE,
454 "tracer-dynamic-coverage",
455 "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is not available.",
456 75, 0, 100)
457DEFPARAM(TRACER_MAX_CODE_GROWTH,
458 "tracer-max-code-growth",
459 "Maximal code growth caused by tail duplication (in percent).",
460 100, 0, 0)
461DEFPARAM(TRACER_MIN_BRANCH_RATIO,
462 "tracer-min-branch-ratio",
463 "Stop reverse growth if the reverse probability of best edge is less than this threshold (in percent).",
464 10, 0, 100)
465DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY_FEEDBACK,
466 "tracer-min-branch-probability-feedback",
467 "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is available.",
468 80, 0, 100)
469DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY,
470 "tracer-min-branch-probability",
471 "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is not available.",
472 50, 0, 100)
473
474/* The maximum number of incoming edges to consider for crossjumping. */
475DEFPARAM(PARAM_MAX_CROSSJUMP_EDGES,
476 "max-crossjump-edges",
477 "The maximum number of incoming edges to consider for crossjumping.",
478 100, 0, 0)
479
480/* The minimum number of matching instructions to consider for crossjumping. */
481DEFPARAM(PARAM_MIN_CROSSJUMP_INSNS,
482 "min-crossjump-insns",
483 "The minimum number of matching instructions to consider for crossjumping.",
484 5, 1, 0)
485
486/* The maximum number expansion factor when copying basic blocks. */
487DEFPARAM(PARAM_MAX_GROW_COPY_BB_INSNS,
488 "max-grow-copy-bb-insns",
489 "The maximum expansion factor when copying basic blocks.",
490 8, 0, 0)
491
492/* The maximum number of insns to duplicate when unfactoring computed gotos. */
493DEFPARAM(PARAM_MAX_GOTO_DUPLICATION_INSNS,
494 "max-goto-duplication-insns",
495 "The maximum number of insns to duplicate when unfactoring computed gotos.",
496 8, 0, 0)
497
498/* The maximum length of path considered in cse. */
499DEFPARAM(PARAM_MAX_CSE_PATH_LENGTH,
500 "max-cse-path-length",
501 "The maximum length of path considered in cse.",
502 10, 1, 0)
503DEFPARAM(PARAM_MAX_CSE_INSNS,
504 "max-cse-insns",
505 "The maximum instructions CSE process before flushing.",
506 1000, 0, 0)
507
508/* The cost of expression in loop invariant motion that is considered
509 expensive. */
510DEFPARAM(PARAM_LIM_EXPENSIVE,
511 "lim-expensive",
512 "The minimum cost of an expensive expression in the loop invariant motion.",
513 20, 0, 0)
514
515/* Bound on number of candidates for induction variables below that
516 all candidates are considered for each use in induction variable
517 optimizations. */
518
519DEFPARAM(PARAM_IV_CONSIDER_ALL_CANDIDATES_BOUND,
520 "iv-consider-all-candidates-bound",
521 "Bound on number of candidates below that all candidates are considered in iv optimizations.",
522 40, 0, 0)
523
524/* The induction variable optimizations give up on loops that contain more
525 induction variable uses. */
526
527DEFPARAM(PARAM_IV_MAX_CONSIDERED_USES,
528 "iv-max-considered-uses",
529 "Bound on number of iv uses in loop optimized in iv optimizations.",
530 250, 0, 0)
531
532/* If there are at most this number of ivs in the set, try removing unnecessary
533 ivs from the set always. */
534
535DEFPARAM(PARAM_IV_ALWAYS_PRUNE_CAND_SET_BOUND,
536 "iv-always-prune-cand-set-bound",
537 "If number of candidates in the set is smaller, we always try to remove unused ivs during its optimization.",
538 10, 0, 0)
539
540DEFPARAM(PARAM_AVG_LOOP_NITER,
541 "avg-loop-niter",
542 "Average number of iterations of a loop.",
543 10, 1, 0)
544
545DEFPARAM(PARAM_DSE_MAX_OBJECT_SIZE,
546 "dse-max-object-size",
547 "Maximum size (in bytes) of objects tracked bytewise by dead store elimination.",
548 256, 0, 0)
549
550DEFPARAM(PARAM_SCEV_MAX_EXPR_SIZE,
551 "scev-max-expr-size",
552 "Bound on size of expressions used in the scalar evolutions analyzer.",
553 100, 0, 0)
554
555DEFPARAM(PARAM_SCEV_MAX_EXPR_COMPLEXITY,
556 "scev-max-expr-complexity",
557 "Bound on the complexity of the expressions in the scalar evolutions analyzer.",
558 10, 0, 0)
559
560DEFPARAM (PARAM_MAX_TREE_IF_CONVERSION_PHI_ARGS,
561 "max-tree-if-conversion-phi-args",
562 "Maximum number of arguments in a PHI supported by TREE if-conversion "
563 "unless the loop is marked with simd pragma.",
564 4, 2, 0)
565
566DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS,
567 "vect-max-version-for-alignment-checks",
568 "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alignment check.",
569 6, 0, 0)
570
571DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS,
572 "vect-max-version-for-alias-checks",
573 "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alias check.",
574 10, 0, 0)
575
576DEFPARAM(PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT,
577 "vect-max-peeling-for-alignment",
578 "Maximum number of loop peels to enhance alignment of data references in a loop.",
579 -1, -1, 64)
580
581DEFPARAM(PARAM_MAX_CSELIB_MEMORY_LOCATIONS,
582 "max-cselib-memory-locations",
583 "The maximum memory locations recorded by cselib.",
584 500, 0, 0)
585
586#ifdef ENABLE_GC_ALWAYS_COLLECT
587# define GGC_MIN_EXPAND_DEFAULT 0
588# define GGC_MIN_HEAPSIZE_DEFAULT 0
589#else
590# define GGC_MIN_EXPAND_DEFAULT 30
591# define GGC_MIN_HEAPSIZE_DEFAULT 4096
592#endif
593
594DEFPARAM(GGC_MIN_EXPAND,
595 "ggc-min-expand",
596 "Minimum heap expansion to trigger garbage collection, as a percentage of the total size of the heap.",
597 GGC_MIN_EXPAND_DEFAULT, 0, 0)
598
599DEFPARAM(GGC_MIN_HEAPSIZE,
600 "ggc-min-heapsize",
601 "Minimum heap size before we start collecting garbage, in kilobytes.",
602 GGC_MIN_HEAPSIZE_DEFAULT, 0, 0)
603
604#undef GGC_MIN_EXPAND_DEFAULT
605#undef GGC_MIN_HEAPSIZE_DEFAULT
606
607DEFPARAM(PARAM_MAX_RELOAD_SEARCH_INSNS,
608 "max-reload-search-insns",
609 "The maximum number of instructions to search backward when looking for equivalent reload.",
610 100, 0, 0)
611
612DEFPARAM(PARAM_SINK_FREQUENCY_THRESHOLD,
613 "sink-frequency-threshold",
614 "Target block's relative execution frequency (as a percentage) required to sink a statement.",
615 75, 0, 100)
616
617DEFPARAM(PARAM_MAX_SCHED_REGION_BLOCKS,
618 "max-sched-region-blocks",
619 "The maximum number of blocks in a region to be considered for interblock scheduling.",
620 10, 0, 0)
621
622DEFPARAM(PARAM_MAX_SCHED_REGION_INSNS,
623 "max-sched-region-insns",
624 "The maximum number of insns in a region to be considered for interblock scheduling.",
625 100, 0, 0)
626
627DEFPARAM(PARAM_MAX_PIPELINE_REGION_BLOCKS,
628 "max-pipeline-region-blocks",
629 "The maximum number of blocks in a region to be considered for interblock scheduling.",
630 15, 0, 0)
631
632DEFPARAM(PARAM_MAX_PIPELINE_REGION_INSNS,
633 "max-pipeline-region-insns",
634 "The maximum number of insns in a region to be considered for interblock scheduling.",
635 200, 0, 0)
636
637DEFPARAM(PARAM_MIN_SPEC_PROB,
638 "min-spec-prob",
639 "The minimum probability of reaching a source block for interblock speculative scheduling.",
640 40, 0, 0)
641
642DEFPARAM(PARAM_MAX_SCHED_EXTEND_REGIONS_ITERS,
643 "max-sched-extend-regions-iters",
644 "The maximum number of iterations through CFG to extend regions.",
645 0, 0, 0)
646
647DEFPARAM(PARAM_MAX_SCHED_INSN_CONFLICT_DELAY,
648 "max-sched-insn-conflict-delay",
649 "The maximum conflict delay for an insn to be considered for speculative motion.",
650 3, 1, 10)
651
652DEFPARAM(PARAM_SCHED_SPEC_PROB_CUTOFF,
653 "sched-spec-prob-cutoff",
654 "The minimal probability of speculation success (in percents), so that speculative insn will be scheduled.",
655 40, 0, 100)
656
657DEFPARAM(PARAM_SCHED_STATE_EDGE_PROB_CUTOFF,
658 "sched-state-edge-prob-cutoff",
659 "The minimum probability an edge must have for the scheduler to save its state across it.",
660 10, 0, 100)
661
662DEFPARAM(PARAM_SELSCHED_MAX_LOOKAHEAD,
663 "selsched-max-lookahead",
664 "The maximum size of the lookahead window of selective scheduling.",
665 50, 0, 0)
666
667DEFPARAM(PARAM_SELSCHED_MAX_SCHED_TIMES,
668 "selsched-max-sched-times",
669 "Maximum number of times that an insn could be scheduled.",
670 2, 1, 0)
671
672DEFPARAM(PARAM_SELSCHED_INSNS_TO_RENAME,
673 "selsched-insns-to-rename",
674 "Maximum number of instructions in the ready list that are considered eligible for renaming.",
675 2, 0, 0)
676
677DEFPARAM (PARAM_SCHED_MEM_TRUE_DEP_COST,
678 "sched-mem-true-dep-cost",
679 "Minimal distance between possibly conflicting store and load.",
680 1, 0, 0)
681
682DEFPARAM (PARAM_SCHED_AUTOPREF_QUEUE_DEPTH,
683 "sched-autopref-queue-depth",
684 "Hardware autoprefetcher scheduler model control flag. Number of lookahead cycles the model looks into; at '0' only enable instruction sorting heuristic. Disabled by default.",
685 -1, 0, 0)
686
687DEFPARAM(PARAM_MAX_LAST_VALUE_RTL,
688 "max-last-value-rtl",
689 "The maximum number of RTL nodes that can be recorded as combiner's last value.",
690 10000, 0, 0)
691
692DEFPARAM(PARAM_MAX_COMBINE_INSNS,
693 "max-combine-insns",
694 "The maximum number of insns combine tries to combine.",
695 4, 2, 4)
696
697/* INTEGER_CST nodes are shared for values [{-1,0} .. N) for
698 {signed,unsigned} integral types. This determines N.
699 Experimentation shows 251 to be a good value that generates the
700 least amount of garbage for allocating the TREE_VEC storage. */
701DEFPARAM (PARAM_INTEGER_SHARE_LIMIT,
702 "integer-share-limit",
703 "The upper bound for sharing integer constants.",
704 251, 2, 2)
705
706DEFPARAM (PARAM_SSP_BUFFER_SIZE,
707 "ssp-buffer-size",
708 "The lower bound for a buffer to be considered for stack smashing protection.",
709 8, 1, 0)
710
711DEFPARAM (PARAM_MIN_SIZE_FOR_STACK_SHARING,
712 "min-size-for-stack-sharing",
713 "The minimum size of variables taking part in stack slot sharing "
714 "when not optimizing.",
715 32, 0, 0)
716
717/* When we thread through a block we have to make copies of the
718 statements within the block. Clearly for large blocks the code
719 duplication is bad.
720
721 PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS specifies the maximum number
722 of statements and PHI nodes allowed in a block which is going to
723 be duplicated for thread jumping purposes.
724
725 Some simple analysis showed that more than 99% of the jump
726 threading opportunities are for blocks with less than 15
727 statements. So we can get the benefits of jump threading
728 without excessive code bloat for pathological cases with the
729 throttle set at 15 statements. */
730DEFPARAM (PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS,
731 "max-jump-thread-duplication-stmts",
732 "Maximum number of statements allowed in a block that needs to be duplicated when threading jumps.",
733 15, 0, 0)
734
735/* This is the maximum number of fields a variable may have before the pointer analysis machinery
736 will stop trying to treat it in a field-sensitive manner.
737 There are programs out there with thousands of fields per structure, and handling them
738 field-sensitively is not worth the cost. */
739DEFPARAM (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
740 "max-fields-for-field-sensitive",
741 "Maximum number of fields in a structure before pointer analysis treats the structure as a single variable.",
742 0, 0, 0)
743
744DEFPARAM(PARAM_MAX_SCHED_READY_INSNS,
745 "max-sched-ready-insns",
746 "The maximum number of instructions ready to be issued to be considered by the scheduler during the first scheduling pass.",
747 100, 0, 0)
748
749/* This is the maximum number of active local stores RTL DSE will consider. */
750DEFPARAM (PARAM_MAX_DSE_ACTIVE_LOCAL_STORES,
751 "max-dse-active-local-stores",
752 "Maximum number of active local stores in RTL dead store elimination.",
753 5000, 0, 0)
754
755/* Prefetching and cache-optimizations related parameters. Default values are
756 usually set by machine description. */
757
758/* The number of insns executed before prefetch is completed. */
759
760DEFPARAM (PARAM_PREFETCH_LATENCY,
761 "prefetch-latency",
762 "The number of insns executed before prefetch is completed.",
763 200, 0, 0)
764
765/* The number of prefetches that can run at the same time. */
766
767DEFPARAM (PARAM_SIMULTANEOUS_PREFETCHES,
768 "simultaneous-prefetches",
769 "The number of prefetches that can run at the same time.",
770 3, 0, 0)
771
772/* The size of L1 cache in kB. */
773
774DEFPARAM (PARAM_L1_CACHE_SIZE,
775 "l1-cache-size",
776 "The size of L1 cache.",
777 64, 0, 0)
778
779/* The size of L1 cache line in bytes. */
780
781DEFPARAM (PARAM_L1_CACHE_LINE_SIZE,
782 "l1-cache-line-size",
783 "The size of L1 cache line.",
784 32, 0, 0)
785
786/* The size of L2 cache in kB. */
787
788DEFPARAM (PARAM_L2_CACHE_SIZE,
789 "l2-cache-size",
790 "The size of L2 cache.",
791 512, 0, 0)
792
793/* Maximum number of statements in loop nest for loop interchange. */
794
795DEFPARAM (PARAM_LOOP_INTERCHANGE_MAX_NUM_STMTS,
796 "loop-interchange-max-num-stmts",
797 "The maximum number of stmts in loop nest for loop interchange.",
798 64, 0, 0)
799
800/* Minimum stride ratio for loop interchange to be profitiable. */
801
802DEFPARAM (PARAM_LOOP_INTERCHANGE_STRIDE_RATIO,
803 "loop-interchange-stride-ratio",
804 "The minimum stride ratio for loop interchange to be profitable",
805 2, 0, 0)
806
807/* Whether we should use canonical types rather than deep "structural"
808 type checking. Setting this value to 1 (the default) improves
809 compilation performance in the C++ and Objective-C++ front end;
810 this value should only be set to zero to work around bugs in the
811 canonical type system by disabling it. */
812
813DEFPARAM (PARAM_USE_CANONICAL_TYPES,
814 "use-canonical-types",
815 "Whether to use canonical types.",
816 1, 0, 1)
817
818DEFPARAM (PARAM_MAX_PARTIAL_ANTIC_LENGTH,
819 "max-partial-antic-length",
820 "Maximum length of partial antic set when performing tree pre optimization.",
821 100, 0, 0)
822
823/* The following is used as a stop-gap limit for cases where really huge
824 SCCs blow up memory and compile-time use too much. If we hit this limit,
825 SCCVN and such FRE and PRE will be not done at all for the current
826 function. */
827
828DEFPARAM (PARAM_SCCVN_MAX_SCC_SIZE,
829 "sccvn-max-scc-size",
830 "Maximum size of a SCC before SCCVN stops processing a function.",
831 10000, 10, 0)
832
833/* The following is used as a stop-gap limit for cases where really huge
834 functions blow up compile-time use too much. It limits the number of
835 alias-queries we do for finding common subexpressions for memory loads and
836 stores. The number of alias-queries is otherwise limited by the number of
837 stores on paths to function entry. */
838
839DEFPARAM (PARAM_SCCVN_MAX_ALIAS_QUERIES_PER_ACCESS,
840 "sccvn-max-alias-queries-per-access",
841 "Maximum number of disambiguations to perform per memory access.",
842 1000, 0, 0)
843
844DEFPARAM (PARAM_IRA_MAX_LOOPS_NUM,
845 "ira-max-loops-num",
846 "Max loops number for regional RA.",
847 100, 0, 0)
848
849DEFPARAM (PARAM_IRA_MAX_CONFLICT_TABLE_SIZE,
850 "ira-max-conflict-table-size",
851 "Max size of conflict table in MB.",
852 1000, 0, 0)
853
854DEFPARAM (PARAM_IRA_LOOP_RESERVED_REGS,
855 "ira-loop-reserved-regs",
856 "The number of registers in each class kept unused by loop invariant motion.",
857 2, 0, 0)
858
859DEFPARAM (PARAM_LRA_MAX_CONSIDERED_RELOAD_PSEUDOS,
860 "lra-max-considered-reload-pseudos",
861 "The max number of reload pseudos which are considered during spilling a non-reload pseudo.",
862 500, 0, 0)
863
864DEFPARAM (PARAM_LRA_INHERITANCE_EBB_PROBABILITY_CUTOFF,
865 "lra-inheritance-ebb-probability-cutoff",
866 "Minimal fall-through edge probability in percentage used to add BB to inheritance EBB in LRA.",
867 40, 0, 100)
868
869/* Switch initialization conversion will refuse to create arrays that are
870 bigger than this parameter times the number of switch branches. */
871
872DEFPARAM (PARAM_SWITCH_CONVERSION_BRANCH_RATIO,
873 "switch-conversion-max-branch-ratio",
874 "The maximum ratio between array size and switch branches for "
875 "a switch conversion to take place.",
876 8, 1, 0)
877
878/* Size of tiles when doing loop blocking. */
879
880DEFPARAM (PARAM_LOOP_BLOCK_TILE_SIZE,
881 "loop-block-tile-size",
882 "size of tiles for loop blocking.",
883 51, 0, 0)
884
885/* Maximal number of parameters that we allow in a SCoP. */
886
887DEFPARAM (PARAM_GRAPHITE_MAX_NB_SCOP_PARAMS,
888 "graphite-max-nb-scop-params",
889 "maximum number of parameters in a SCoP.",
890 10, 0, 0)
891
892/* Maximal number of array references in a scop. */
893
894DEFPARAM (PARAM_GRAPHITE_MAX_ARRAYS_PER_SCOP,
895 "graphite-max-arrays-per-scop",
896 "maximum number of arrays per scop.",
897 100, 0, 0)
898
899DEFPARAM (PARAM_MAX_ISL_OPERATIONS,
900 "max-isl-operations",
901 "maximum number of isl operations, 0 means unlimited",
902 350000, 0, 0)
903
904/* For testsuite purposes allow to check for codegen error handling. */
905DEFPARAM (PARAM_GRAPHITE_ALLOW_CODEGEN_ERRORS,
906 "graphite-allow-codegen-errors",
907 "whether codegen errors should be ICEs when -fchecking.",
908 0, 0, 1)
909
910/* Avoid data dependence analysis on very large loops. */
911DEFPARAM (PARAM_LOOP_MAX_DATAREFS_FOR_DATADEPS,
912 "loop-max-datarefs-for-datadeps",
913 "Maximum number of datarefs in loop for building loop data dependencies.",
914 1000, 0, 0)
915
916/* Avoid doing loop invariant motion on very large loops. */
917
918DEFPARAM (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
919 "loop-invariant-max-bbs-in-loop",
920 "Max basic blocks number in loop for loop invariant motion.",
921 10000, 0, 0)
922
923/* When the parameter is 1, use the internal function id
924 to look up for profile data. Otherwise, use a more stable
925 external id based on assembler name and source location. */
926DEFPARAM (PARAM_PROFILE_FUNC_INTERNAL_ID,
927 "profile-func-internal-id",
928 "use internal function id in profile lookup.",
929 0, 0, 1)
930
931/* When the parameter is 1, track the most frequent N target
932 addresses in indirect-call profile. This disables
933 indirect_call_profiler_v2 which tracks single target. */
934DEFPARAM (PARAM_INDIR_CALL_TOPN_PROFILE,
935 "indir-call-topn-profile",
936 "track topn target addresses in indirect-call profile.",
937 0, 0, 1)
938
939/* Avoid SLP vectorization of large basic blocks. */
940DEFPARAM (PARAM_SLP_MAX_INSNS_IN_BB,
941 "slp-max-insns-in-bb",
942 "Maximum number of instructions in basic block to be considered for SLP vectorization.",
943 1000, 0, 0)
944
945DEFPARAM (PARAM_MIN_INSN_TO_PREFETCH_RATIO,
946 "min-insn-to-prefetch-ratio",
947 "Min. ratio of insns to prefetches to enable prefetching for "
948 "a loop with an unknown trip count.",
949 9, 0, 0)
950
951DEFPARAM (PARAM_PREFETCH_MIN_INSN_TO_MEM_RATIO,
952 "prefetch-min-insn-to-mem-ratio",
953 "Min. ratio of insns to mem ops to enable prefetching in a loop.",
954 3, 0, 0)
955
956/* Set maximum hash table size for var tracking. */
957
958DEFPARAM (PARAM_MAX_VARTRACK_SIZE,
959 "max-vartrack-size",
960 "Max. size of var tracking hash tables.",
961 50000000, 0, 0)
962
963/* Set maximum recursion depth for var tracking expression expansion
964 and resolution. */
965
966DEFPARAM (PARAM_MAX_VARTRACK_EXPR_DEPTH,
967 "max-vartrack-expr-depth",
968 "Max. recursion depth for expanding var tracking expressions.",
969 12, 0, 0)
970
971/* Set maximum length of value location list for which var tracking
972 should add reverse operations. */
973
974DEFPARAM (PARAM_MAX_VARTRACK_REVERSE_OP_SIZE,
975 "max-vartrack-reverse-op-size",
976 "Max. size of loc list for which reverse ops should be added.",
977 50, 0, 0)
978
979/* Set a threshold to discard debug markers (e.g. debug begin stmt
980 markers) when expanding a function to RTL, or inlining it into
981 another function. */
982
983DEFPARAM (PARAM_MAX_DEBUG_MARKER_COUNT,
984 "max-debug-marker-count",
985 "Max. count of debug markers to expand or inline.",
986 100000, 0, 0)
987
988/* Set minimum insn uid for non-debug insns. */
989
990DEFPARAM (PARAM_MIN_NONDEBUG_INSN_UID,
991 "min-nondebug-insn-uid",
992 "The minimum UID to be used for a nondebug insn.",
993 0, 0, 0)
994
995DEFPARAM (PARAM_IPA_SRA_PTR_GROWTH_FACTOR,
996 "ipa-sra-ptr-growth-factor",
997 "Maximum allowed growth of number and total size of new parameters "
998 "that ipa-sra replaces a pointer to an aggregate with.",
999 2, 0, 0)
1000
1001DEFPARAM (PARAM_TM_MAX_AGGREGATE_SIZE,
1002 "tm-max-aggregate-size",
1003 "Size in bytes after which thread-local aggregates should be "
1004 "instrumented with the logging functions instead of save/restore "
1005 "pairs.",
1006 9, 0, 0)
1007
1008DEFPARAM (PARAM_SRA_MAX_SCALARIZATION_SIZE_SPEED,
1009 "sra-max-scalarization-size-Ospeed",
1010 "Maximum size, in storage units, of an aggregate which should be "
1011 "considered for scalarization when compiling for speed.",
1012 0, 0, 0)
1013
1014DEFPARAM (PARAM_SRA_MAX_SCALARIZATION_SIZE_SIZE,
1015 "sra-max-scalarization-size-Osize",
1016 "Maximum size, in storage units, of an aggregate which should be "
1017 "considered for scalarization when compiling for size.",
1018 0, 0, 0)
1019
1020DEFPARAM (PARAM_IPA_CP_VALUE_LIST_SIZE,
1021 "ipa-cp-value-list-size",
1022 "Maximum size of a list of values associated with each parameter for "
1023 "interprocedural constant propagation.",
1024 8, 0, 0)
1025
1026DEFPARAM (PARAM_IPA_CP_EVAL_THRESHOLD,
1027 "ipa-cp-eval-threshold",
1028 "Threshold ipa-cp opportunity evaluation that is still considered "
1029 "beneficial to clone..",
1030 500, 0, 0)
1031
1032DEFPARAM (PARAM_IPA_CP_RECURSION_PENALTY,
1033 "ipa-cp-recursion-penalty",
1034 "Percentage penalty the recursive functions will receive when they "
1035 "are evaluated for cloning..",
1036 40, 0, 100)
1037
1038DEFPARAM (PARAM_IPA_CP_SINGLE_CALL_PENALTY,
1039 "ipa-cp-single-call-penalty",
1040 "Percentage penalty functions containing a single call to another "
1041 "function will receive when they are evaluated for cloning..",
1042 15, 0, 100)
1043
1044DEFPARAM (PARAM_IPA_MAX_AGG_ITEMS,
1045 "ipa-max-agg-items",
1046 "Maximum number of aggregate content items for a parameter in "
1047 "jump functions and lattices.",
1048 16, 0, 0)
1049
1050DEFPARAM (PARAM_IPA_CP_LOOP_HINT_BONUS,
1051 "ipa-cp-loop-hint-bonus",
1052 "Compile-time bonus IPA-CP assigns to candidates which make loop "
1053 "bounds or strides known..",
1054 64, 0, 0)
1055
1056DEFPARAM (PARAM_IPA_CP_ARRAY_INDEX_HINT_BONUS,
1057 "ipa-cp-array-index-hint-bonus",
1058 "Compile-time bonus IPA-CP assigns to candidates which make an array "
1059 "index known..",
1060 48, 0, 0)
1061
1062DEFPARAM (PARAM_IPA_MAX_AA_STEPS,
1063 "ipa-max-aa-steps",
1064 "Maximum number of statements that will be visited by IPA formal "
1065 "parameter analysis based on alias analysis in any given function.",
1066 25000, 0, 0)
1067
1068/* WHOPR partitioning configuration. */
1069
1070DEFPARAM (PARAM_LTO_PARTITIONS,
1071 "lto-partitions",
1072 "Number of partitions the program should be split to.",
1073 32, 1, 0)
1074
1075DEFPARAM (MIN_PARTITION_SIZE,
1076 "lto-min-partition",
1077 "Minimal size of a partition for LTO (in estimated instructions).",
1078 10000, 0, 0)
1079
1080DEFPARAM (MAX_PARTITION_SIZE,
1081 "lto-max-partition",
1082 "Maximal size of a partition for LTO (in estimated instructions).",
1083 1000000, 0, INT_MAX)
1084
1085/* Diagnostic parameters. */
1086
1087DEFPARAM (CXX_MAX_NAMESPACES_FOR_DIAGNOSTIC_HELP,
1088 "cxx-max-namespaces-for-diagnostic-help",
1089 "Maximum number of namespaces to search for alternatives when "
1090 "name lookup fails.",
1091 1000, 0, 0)
1092
1093/* Maximum number of conditional store pairs that can be sunk. */
1094DEFPARAM (PARAM_MAX_STORES_TO_SINK,
1095 "max-stores-to-sink",
1096 "Maximum number of conditional store pairs that can be sunk.",
1097 2, 0, 0)
1098
1099/* Override CASE_VALUES_THRESHOLD of when to switch from doing switch
1100 statements via if statements to using a table jump operation. If the value
1101 is 0, the default CASE_VALUES_THRESHOLD will be used. */
1102DEFPARAM (PARAM_CASE_VALUES_THRESHOLD,
1103 "case-values-threshold",
1104 "The smallest number of different values for which it is best to "
1105 "use a jump-table instead of a tree of conditional branches, "
1106 "if 0, use the default for the machine.",
1107 0, 0, 0)
1108
1109/* Data race flags for C++0x memory model compliance. */
1110DEFPARAM (PARAM_ALLOW_STORE_DATA_RACES,
1111 "allow-store-data-races",
1112 "Allow new data races on stores to be introduced.",
1113 0, 0, 1)
1114
1115/* Reassociation width to be used by tree reassoc optimization. */
1116DEFPARAM (PARAM_TREE_REASSOC_WIDTH,
1117 "tree-reassoc-width",
1118 "Set the maximum number of instructions executed in parallel in "
1119 "reassociated tree. If 0, use the target dependent heuristic..",
1120 0, 0, 0)
1121
1122DEFPARAM (PARAM_MAX_TAIL_MERGE_COMPARISONS,
1123 "max-tail-merge-comparisons",
1124 "Maximum amount of similar bbs to compare a bb with.",
1125 10, 0, 0)
1126
1127DEFPARAM (PARAM_STORE_MERGING_ALLOW_UNALIGNED,
1128 "store-merging-allow-unaligned",
1129 "Allow the store merging pass to introduce unaligned stores "
1130 "if it is legal to do so.",
1131 1, 0, 1)
1132
1133DEFPARAM (PARAM_MAX_STORES_TO_MERGE,
1134 "max-stores-to-merge",
1135 "Maximum number of constant stores to merge in the "
1136 "store merging pass.",
1137 64, 2, 0)
1138
1139DEFPARAM (PARAM_MAX_TAIL_MERGE_ITERATIONS,
1140 "max-tail-merge-iterations",
1141 "Maximum amount of iterations of the pass over a function.",
1142 2, 0, 0)
1143
1144/* Maximum number of strings for which strlen optimization pass will
1145 track string lenths. */
1146DEFPARAM (PARAM_MAX_TRACKED_STRLENS,
1147 "max-tracked-strlens",
1148 "Maximum number of strings for which strlen optimization pass will "
1149 "track string lengths.",
1150 10000, 0, 0)
1151
1152/* Keep this in sync with the sched_pressure_algorithm enum. */
1153DEFPARAM (PARAM_SCHED_PRESSURE_ALGORITHM,
1154 "sched-pressure-algorithm",
1155 "Which -fsched-pressure algorithm to apply.",
1156 1, 1, 2)
1157
1158/* Maximum length of candidate scans in straight-line strength reduction. */
1159DEFPARAM (PARAM_MAX_SLSR_CANDIDATE_SCAN,
1160 "max-slsr-cand-scan",
1161 "Maximum length of candidate scans for straight-line "
1162 "strength reduction.",
1163 50, 1, 999999)
1164
1165DEFPARAM (PARAM_ASAN_STACK,
1166 "asan-stack",
1167 "Enable asan stack protection.",
1168 1, 0, 1)
1169
1170DEFPARAM (PARAM_ASAN_PROTECT_ALLOCAS,
1171 "asan-instrument-allocas",
1172 "Enable asan allocas/VLAs protection.",
1173 1, 0, 1)
1174
1175DEFPARAM (PARAM_ASAN_GLOBALS,
1176 "asan-globals",
1177 "Enable asan globals protection.",
1178 1, 0, 1)
1179
1180DEFPARAM (PARAM_ASAN_INSTRUMENT_WRITES,
1181 "asan-instrument-writes",
1182 "Enable asan store operations protection.",
1183 1, 0, 1)
1184
1185DEFPARAM (PARAM_ASAN_INSTRUMENT_READS,
1186 "asan-instrument-reads",
1187 "Enable asan load operations protection.",
1188 1, 0, 1)
1189
1190DEFPARAM (PARAM_ASAN_MEMINTRIN,
1191 "asan-memintrin",
1192 "Enable asan builtin functions protection.",
1193 1, 0, 1)
1194
1195DEFPARAM (PARAM_ASAN_USE_AFTER_RETURN,
1196 "asan-use-after-return",
1197 "Enable asan detection of use-after-return bugs.",
1198 1, 0, 1)
1199
1200DEFPARAM (PARAM_ASAN_INSTRUMENTATION_WITH_CALL_THRESHOLD,
1201 "asan-instrumentation-with-call-threshold",
1202 "Use callbacks instead of inline code if number of accesses "
1203 "in function becomes greater or equal to this number.",
1204 7000, 0, INT_MAX)
1205
1206DEFPARAM (PARAM_USE_AFTER_SCOPE_DIRECT_EMISSION_THRESHOLD,
1207 "use-after-scope-direct-emission-threshold",
1208 "Use direct poisoning/unpoisoning instructions for variables "
1209 "smaller or equal to this number.",
1210 256, 0, INT_MAX)
1211
1212DEFPARAM (PARAM_UNINIT_CONTROL_DEP_ATTEMPTS,
1213 "uninit-control-dep-attempts",
1214 "Maximum number of nested calls to search for control dependencies "
1215 "during uninitialized variable analysis.",
1216 1000, 1, 0)
1217
1218DEFPARAM (PARAM_CHKP_MAX_CTOR_SIZE,
1219 "chkp-max-ctor-size",
1220 "Maximum number of statements to be included into a single static "
1221 "constructor generated by Pointer Bounds Checker.",
1222 5000, 100, 0)
1223
1224DEFPARAM (PARAM_FSM_SCALE_PATH_STMTS,
1225 "fsm-scale-path-stmts",
1226 "Scale factor to apply to the number of statements in a threading path when comparing to the number of (scaled) blocks.",
1227 2, 1, 10)
1228
1229DEFPARAM (PARAM_FSM_MAXIMUM_PHI_ARGUMENTS,
1230 "fsm-maximum-phi-arguments",
1231 "Maximum number of arguments a PHI may have before the FSM threader will not try to thread through its block.",
1232 100, 1, 999999)
1233
1234DEFPARAM (PARAM_FSM_SCALE_PATH_BLOCKS,
1235 "fsm-scale-path-blocks",
1236 "Scale factor to apply to the number of blocks in a threading path when comparing to the number of (scaled) statements.",
1237 3, 1, 10)
1238
1239DEFPARAM (PARAM_MAX_FSM_THREAD_PATH_INSNS,
1240 "max-fsm-thread-path-insns",
1241 "Maximum number of instructions to copy when duplicating blocks on a finite state automaton jump thread path.",
1242 100, 1, 999999)
1243
1244DEFPARAM (PARAM_MAX_FSM_THREAD_LENGTH,
1245 "max-fsm-thread-length",
1246 "Maximum number of basic blocks on a finite state automaton jump thread path.",
1247 10, 1, 999999)
1248
1249DEFPARAM (PARAM_MAX_FSM_THREAD_PATHS,
1250 "max-fsm-thread-paths",
1251 "Maximum number of new jump thread paths to create for a finite state automaton.",
1252 50, 1, 999999)
1253
1254DEFPARAM (PARAM_PARLOOPS_CHUNK_SIZE,
1255 "parloops-chunk-size",
1256 "Chunk size of omp schedule for loops parallelized by parloops.",
1257 0, 0, 0)
1258
1259DEFPARAMENUM5 (PARAM_PARLOOPS_SCHEDULE,
1260 "parloops-schedule",
1261 "Schedule type of omp schedule for loops parallelized by "
1262 "parloops (static, dynamic, guided, auto, runtime).",
1263 static,
1264 static, dynamic, guided, auto, runtime)
1265
1266DEFPARAM (PARAM_PARLOOPS_MIN_PER_THREAD,
1267 "parloops-min-per-thread",
1268 "Minimum number of iterations per thread of an innermost "
1269 "parallelized loop.",
1270 100, 2, 0)
1271
1272DEFPARAM (PARAM_MAX_SSA_NAME_QUERY_DEPTH,
1273 "max-ssa-name-query-depth",
1274 "Maximum recursion depth allowed when querying a property of an"
1275 " SSA name.",
1276 3, 1, 10)
1277
1278DEFPARAM (PARAM_MAX_RTL_IF_CONVERSION_INSNS,
1279 "max-rtl-if-conversion-insns",
1280 "Maximum number of insns in a basic block to consider for RTL "
1281 "if-conversion.",
1282 10, 0, 99)
1283
1284DEFPARAM (PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST,
1285 "max-rtl-if-conversion-predictable-cost",
1286 "Maximum permissible cost for the sequence that would be "
1287 "generated by the RTL if-conversion pass for a branch that "
1288 "is considered predictable.",
1289 20, 0, 200)
1290
1291DEFPARAM (PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST,
1292 "max-rtl-if-conversion-unpredictable-cost",
1293 "Maximum permissible cost for the sequence that would be "
1294 "generated by the RTL if-conversion pass for a branch that "
1295 "is considered unpredictable.",
1296 40, 0, 200)
1297
1298DEFPARAM (PARAM_HSA_GEN_DEBUG_STORES,
1299 "hsa-gen-debug-stores",
1300 "Level of hsa debug stores verbosity",
1301 0, 0, 1)
1302
1303DEFPARAM (PARAM_MAX_SPECULATIVE_DEVIRT_MAYDEFS,
1304 "max-speculative-devirt-maydefs",
1305 "Maximum number of may-defs visited when devirtualizing "
1306 "speculatively", 50, 0, 0)
1307
1308DEFPARAM (PARAM_MAX_VRP_SWITCH_ASSERTIONS,
1309 "max-vrp-switch-assertions",
1310 "Maximum number of assertions to add along the default "
1311 "edge of a switch statement during VRP",
1312 10, 0, 0)
1313
1314DEFPARAM (PARAM_VECT_EPILOGUES_NOMASK,
1315 "vect-epilogues-nomask",
1316 "Enable loop epilogue vectorization using smaller vector size.",
1317 0, 0, 1)
1318
1319DEFPARAM(PARAM_UNROLL_JAM_MIN_PERCENT,
1320 "unroll-jam-min-percent",
1321 "Minimum percentage of memrefs that must go away for unroll-and-jam to be considered profitable.",
1322 1, 0, 100)
1323
1324DEFPARAM(PARAM_UNROLL_JAM_MAX_UNROLL,
1325 "unroll-jam-max-unroll",
1326 "Maximum unroll factor for the unroll-and-jam transformation.",
1327 4, 0, 0)
1328
1329/*
1330
1331Local variables:
1332mode:c
1333End:
1334*/
1335