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c6d9a88c | 1 | /* params.def - Run-time parameters. |
b1fb9f56 | 2 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
3d8864c0 | 3 | Free Software Foundation, Inc. |
c6d9a88c MM |
4 | Written by Mark Mitchell <mark@codesourcery.com>. |
5 | ||
1322177d | 6 | This file is part of GCC. |
c6d9a88c | 7 | |
1322177d LB |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 10 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 11 | version. |
c6d9a88c | 12 | |
1322177d LB |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
c6d9a88c MM |
17 | |
18 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
c6d9a88c MM |
21 | |
22 | /* This file contains definitions for language-independent | |
1eb68dca | 23 | parameters. The DEFPARAM macro takes 6 arguments: |
c6d9a88c | 24 | |
0443f602 | 25 | - The enumeral corresponding to this parameter. |
c6d9a88c | 26 | |
b8698a0f | 27 | - The name that can be used to set this parameter using the |
c6d9a88c MM |
28 | command-line option `--param <name>=<value>'. |
29 | ||
30 | - A help string explaining how the parameter is used. | |
31 | ||
1c4c47db JO |
32 | - A default value for the parameter. |
33 | ||
9e7705cb | 34 | - The minimum acceptable value for the parameter. |
1eb68dca | 35 | |
9e7705cb | 36 | - The maximum acceptable value for the parameter (if greater than |
1eb68dca KZ |
37 | the minimum). |
38 | ||
1c4c47db | 39 | Be sure to add an entry to invoke.texi summarizing the parameter. */ |
c6d9a88c | 40 | |
ea429753 | 41 | /* The threshold ratio between current and hottest structure counts. |
b8698a0f L |
42 | We say that if the ratio of the current structure count, |
43 | calculated by profiling, to the hottest structure count | |
e1dc98b2 OG |
44 | in the program is less than this parameter, then structure |
45 | reorganization is not applied. The default is 10%. */ | |
46 | DEFPARAM (PARAM_STRUCT_REORG_COLD_STRUCT_RATIO, | |
47 | "struct-reorg-cold-struct-ratio", | |
ea429753 | 48 | "The threshold ratio between current and hottest structure counts", |
e1dc98b2 OG |
49 | 10, 0, 100) |
50 | ||
3a4fd356 JH |
51 | /* When branch is predicted to be taken with probability lower than this |
52 | threshold (in percent), then it is considered well predictable. */ | |
53 | DEFPARAM (PARAM_PREDICTABLE_BRANCH_OUTCOME, | |
54 | "predictable-branch-outcome", | |
67018619 | 55 | "Maximal estimated outcome of branch considered predictable", |
3a4fd356 JH |
56 | 2, 0, 50) |
57 | ||
a6227154 KG |
58 | /* The single function inlining limit. This is the maximum size |
59 | of a function counted in internal gcc instructions (not in | |
60 | real machine instructions) that is eligible for inlining | |
61 | by the tree inliner. | |
e5c4f28a | 62 | The default value is 450. |
a6227154 | 63 | Only functions marked inline (or methods defined in the class |
e5c4f28a | 64 | definition for C++) are affected by this. |
a6227154 KG |
65 | There are more restrictions to inlining: If inlined functions |
66 | call other functions, the already inlined instructions are | |
b8698a0f | 67 | counted and once the recursive inline limit (see |
a6227154 KG |
68 | "max-inline-insns" parameter) is exceeded, the acceptable size |
69 | gets decreased. */ | |
70 | DEFPARAM (PARAM_MAX_INLINE_INSNS_SINGLE, | |
71 | "max-inline-insns-single", | |
bc522472 | 72 | "The maximum number of instructions in a single function eligible for inlining", |
172d54e0 | 73 | 400, 0, 0) |
a6227154 | 74 | |
bc522472 KG |
75 | /* The single function inlining limit for functions that are |
76 | inlined by virtue of -finline-functions (-O3). | |
77 | This limit should be chosen to be below or equal to the limit | |
78 | that is applied to functions marked inlined (or defined in the | |
79 | class declaration in C++) given by the "max-inline-insns-single" | |
80 | parameter. | |
e5c4f28a | 81 | The default value is 90. */ |
bc522472 KG |
82 | DEFPARAM (PARAM_MAX_INLINE_INSNS_AUTO, |
83 | "max-inline-insns-auto", | |
84 | "The maximum number of instructions when automatically inlining", | |
c7d68c96 | 85 | 50, 0, 0) |
bc522472 | 86 | |
6de9cd9a DN |
87 | DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE, |
88 | "max-inline-insns-recursive", | |
89 | "The maximum number of instructions inline function can grow to via recursive inlining", | |
172d54e0 | 90 | 450, 0, 0) |
6de9cd9a DN |
91 | |
92 | DEFPARAM (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO, | |
93 | "max-inline-insns-recursive-auto", | |
94 | "The maximum number of instructions non-inline function can grow to via recursive inlining", | |
172d54e0 | 95 | 450, 0, 0) |
6de9cd9a DN |
96 | |
97 | DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH, | |
98 | "max-inline-recursive-depth", | |
99 | "The maximum depth of recursive inlining for inline functions", | |
e06c0feb | 100 | 8, 0, 0) |
6de9cd9a DN |
101 | |
102 | DEFPARAM (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO, | |
103 | "max-inline-recursive-depth-auto", | |
104 | "The maximum depth of recursive inlining for non-inline functions", | |
e06c0feb | 105 | 8, 0, 0) |
6de9cd9a | 106 | |
c5a4444c JH |
107 | DEFPARAM (PARAM_MIN_INLINE_RECURSIVE_PROBABILITY, |
108 | "min-inline-recursive-probability", | |
109 | "Inline recursively only when the probability of call being executed exceeds the parameter", | |
110 | 10, 0, 0) | |
111 | ||
796bda22 JH |
112 | /* Limit of iterations of early inliner. This basically bounds number of |
113 | nested indirect calls early inliner can resolve. Deeper chains are still | |
114 | handled by late inlining. */ | |
115 | DEFPARAM (PARAM_EARLY_INLINER_MAX_ITERATIONS, | |
116 | "max-early-inliner-iterations", | |
117 | "The maximum number of nested indirect inlining performed by early inliner", | |
118 | 10, 0, 0) | |
119 | ||
f37a4f14 RE |
120 | /* Limit the number of expansions created by the variable expansion |
121 | optimization to avoid register pressure. */ | |
122 | DEFPARAM (PARAM_MAX_VARIABLE_EXPANSIONS, | |
123 | "max-variable-expansions-in-unroller", | |
5fa534e3 | 124 | "If -fvariable-expansion-in-unroller is used, the maximum number of times that an individual variable will be expanded during loop unrolling", |
e06c0feb | 125 | 1, 0, 0) |
b8698a0f | 126 | |
acdc40df DN |
127 | /* Limit loop autovectorization to loops with large enough iteration count. */ |
128 | DEFPARAM (PARAM_MIN_VECT_LOOP_BOUND, | |
129 | "min-vect-loop-bound", | |
130 | "If -ftree-vectorize is used, the minimal loop bound of a loop to be considered for vectorization", | |
8d888559 | 131 | 1, 1, 0) |
acdc40df | 132 | |
0443f602 JO |
133 | /* The maximum number of instructions to consider when looking for an |
134 | instruction to fill a delay slot. If more than this arbitrary | |
135 | number of instructions is searched, the time savings from filling | |
136 | the delay slot will be minimal so stop searching. Increasing | |
137 | values mean more aggressive optimization, making the compile time | |
138 | increase with probably small improvement in executable run time. */ | |
139 | DEFPARAM (PARAM_MAX_DELAY_SLOT_INSN_SEARCH, | |
140 | "max-delay-slot-insn-search", | |
141 | "The maximum number of instructions to consider to fill a delay slot", | |
e06c0feb | 142 | 100, 0, 0) |
0443f602 | 143 | |
d5d063d7 JO |
144 | /* When trying to fill delay slots, the maximum number of instructions |
145 | to consider when searching for a block with valid live register | |
146 | information. Increasing this arbitrarily chosen value means more | |
147 | aggressive optimization, increasing the compile time. This | |
148 | parameter should be removed when the delay slot code is rewritten | |
149 | to maintain the control-flow graph. */ | |
150 | DEFPARAM(PARAM_MAX_DELAY_SLOT_LIVE_SEARCH, | |
151 | "max-delay-slot-live-search", | |
152 | "The maximum number of instructions to consider to find accurate live register information", | |
e06c0feb | 153 | 333, 0, 0) |
d5d063d7 | 154 | |
b8698a0f | 155 | /* This parameter limits the number of branch elements that the |
ff7cc307 | 156 | scheduler will track anti-dependencies through without resetting |
b8698a0f L |
157 | the tracking mechanism. Large functions with few calls or barriers |
158 | can generate lists containing many 1000's of dependencies. Generally | |
4a121cc3 AM |
159 | the compiler either uses all available memory, or runs for far too long. */ |
160 | DEFPARAM(PARAM_MAX_PENDING_LIST_LENGTH, | |
161 | "max-pending-list-length", | |
162 | "The maximum length of scheduling's pending operations list", | |
e06c0feb | 163 | 32, 0, 0) |
4a121cc3 | 164 | |
b58b1157 JH |
165 | DEFPARAM(PARAM_LARGE_FUNCTION_INSNS, |
166 | "large-function-insns", | |
167 | "The size of function body to be considered large", | |
e5c4f28a | 168 | 2700, 0, 0) |
b58b1157 JH |
169 | DEFPARAM(PARAM_LARGE_FUNCTION_GROWTH, |
170 | "large-function-growth", | |
2cc98056 | 171 | "Maximal growth due to inlining of large function (in percent)", |
e06c0feb | 172 | 100, 0, 0) |
b4f32d07 JH |
173 | DEFPARAM(PARAM_LARGE_UNIT_INSNS, |
174 | "large-unit-insns", | |
175 | "The size of translation unit to be considered large", | |
176 | 10000, 0, 0) | |
b58b1157 JH |
177 | DEFPARAM(PARAM_INLINE_UNIT_GROWTH, |
178 | "inline-unit-growth", | |
7b98c16f | 179 | "How much can given compilation unit grow because of the inlining (in percent)", |
d562c668 | 180 | 30, 0, 0) |
5e45130d JH |
181 | DEFPARAM(PARAM_IPCP_UNIT_GROWTH, |
182 | "ipcp-unit-growth", | |
7b98c16f | 183 | "How much can given compilation unit grow because of the interprocedural constant propagation (in percent)", |
5e45130d | 184 | 10, 0, 0) |
85057983 JH |
185 | DEFPARAM(PARAM_EARLY_INLINING_INSNS, |
186 | "early-inlining-insns", | |
7b98c16f | 187 | "Maximal estimated growth of function body caused by early inlining of single call", |
ac875c2e | 188 | 8, 0, 0) |
ff28a94d JH |
189 | DEFPARAM(PARAM_LARGE_STACK_FRAME, |
190 | "large-stack-frame", | |
191 | "The size of stack frame to be considered large", | |
192 | 256, 0, 0) | |
193 | DEFPARAM(PARAM_STACK_FRAME_GROWTH, | |
194 | "large-stack-frame-growth", | |
195 | "Maximal stack frame growth due to inlining (in percent)", | |
196 | 1000, 0, 0) | |
b58b1157 | 197 | |
f1fa37ff MM |
198 | /* The GCSE optimization will be disabled if it would require |
199 | significantly more memory than this value. */ | |
200 | DEFPARAM(PARAM_MAX_GCSE_MEMORY, | |
201 | "max-gcse-memory", | |
202 | "The maximum amount of memory to be allocated by GCSE", | |
e06c0feb | 203 | 50 * 1024 * 1024, 0, 0) |
3906a4a1 | 204 | |
f9957958 MH |
205 | /* This is the threshold ratio when to perform partial redundancy |
206 | elimination after reload. We perform partial redundancy elimination | |
207 | when the following holds: | |
208 | (Redundant load execution count) | |
209 | ------------------------------- >= GCSE_AFTER_RELOAD_PARTIAL_FRACTION | |
210 | (Added loads execution count) */ | |
211 | DEFPARAM(PARAM_GCSE_AFTER_RELOAD_PARTIAL_FRACTION, | |
212 | "gcse-after-reload-partial-fraction", | |
c85ce869 | 213 | "The threshold ratio for performing partial redundancy elimination after reload", |
e06c0feb | 214 | 3, 0, 0) |
f9957958 MH |
215 | /* This is the threshold ratio of the critical edges execution count compared to |
216 | the redundant loads execution count that permits performing the load | |
217 | redundancy elimination in gcse after reload. */ | |
218 | DEFPARAM(PARAM_GCSE_AFTER_RELOAD_CRITICAL_FRACTION, | |
219 | "gcse-after-reload-critical-fraction", | |
c85ce869 | 220 | "The threshold ratio of critical edges execution count that permit performing redundancy elimination after reload", |
e06c0feb | 221 | 10, 0, 0) |
03e9dbc9 | 222 | /* This parameter limits the number of insns in a loop that will be unrolled, |
701ad47e | 223 | and by how much the loop is unrolled. |
b8698a0f | 224 | |
701ad47e JH |
225 | This limit should be at most half of the peeling limits: loop unroller |
226 | decides to not unroll loops that iterate fewer than 2*number of allowed | |
a1105617 | 227 | unrollings and thus we would have loops that are neither peeled or unrolled |
701ad47e | 228 | otherwise. */ |
03e9dbc9 MM |
229 | DEFPARAM(PARAM_MAX_UNROLLED_INSNS, |
230 | "max-unrolled-insns", | |
231 | "The maximum number of instructions to consider to unroll in a loop", | |
e06c0feb | 232 | 200, 0, 0) |
b17d5d7c ZD |
233 | /* This parameter limits how many times the loop is unrolled depending |
234 | on number of insns really executed in each iteration. */ | |
235 | DEFPARAM(PARAM_MAX_AVERAGE_UNROLLED_INSNS, | |
236 | "max-average-unrolled-insns", | |
237 | "The maximum number of instructions to consider to unroll in a loop on average", | |
e06c0feb | 238 | 80, 0, 0) |
b17d5d7c ZD |
239 | /* The maximum number of unrollings of a single loop. */ |
240 | DEFPARAM(PARAM_MAX_UNROLL_TIMES, | |
241 | "max-unroll-times", | |
242 | "The maximum number of unrollings of a single loop", | |
e06c0feb | 243 | 8, 0, 0) |
b17d5d7c ZD |
244 | /* The maximum number of insns of a peeled loop. */ |
245 | DEFPARAM(PARAM_MAX_PEELED_INSNS, | |
246 | "max-peeled-insns", | |
247 | "The maximum number of insns of a peeled loop", | |
e06c0feb | 248 | 400, 0, 0) |
b17d5d7c ZD |
249 | /* The maximum number of peelings of a single loop. */ |
250 | DEFPARAM(PARAM_MAX_PEEL_TIMES, | |
251 | "max-peel-times", | |
252 | "The maximum number of peelings of a single loop", | |
e06c0feb | 253 | 16, 0, 0) |
b17d5d7c ZD |
254 | /* The maximum number of insns of a peeled loop. */ |
255 | DEFPARAM(PARAM_MAX_COMPLETELY_PEELED_INSNS, | |
256 | "max-completely-peeled-insns", | |
257 | "The maximum number of insns of a completely peeled loop", | |
e06c0feb | 258 | 400, 0, 0) |
b17d5d7c ZD |
259 | /* The maximum number of peelings of a single loop that is peeled completely. */ |
260 | DEFPARAM(PARAM_MAX_COMPLETELY_PEEL_TIMES, | |
261 | "max-completely-peel-times", | |
262 | "The maximum number of peelings of a single loop that is peeled completely", | |
e06c0feb | 263 | 16, 0, 0) |
b17d5d7c ZD |
264 | /* The maximum number of insns of a peeled loop that rolls only once. */ |
265 | DEFPARAM(PARAM_MAX_ONCE_PEELED_INSNS, | |
266 | "max-once-peeled-insns", | |
267 | "The maximum number of insns of a peeled loop that rolls only once", | |
e06c0feb | 268 | 400, 0, 0) |
194734e9 | 269 | |
617b465c ZD |
270 | /* The maximum number of insns of an unswitched loop. */ |
271 | DEFPARAM(PARAM_MAX_UNSWITCH_INSNS, | |
272 | "max-unswitch-insns", | |
273 | "The maximum number of insns of an unswitched loop", | |
e06c0feb | 274 | 50, 0, 0) |
617b465c ZD |
275 | /* The maximum level of recursion in unswitch_single_loop. */ |
276 | DEFPARAM(PARAM_MAX_UNSWITCH_LEVEL, | |
277 | "max-unswitch-level", | |
278 | "The maximum number of unswitchings in a single loop", | |
e06c0feb | 279 | 3, 0, 0) |
617b465c | 280 | |
e9eb809d ZD |
281 | /* The maximum number of iterations of a loop the brute force algorithm |
282 | for analysis of # of iterations of the loop tries to evaluate. */ | |
283 | DEFPARAM(PARAM_MAX_ITERATIONS_TO_TRACK, | |
284 | "max-iterations-to-track", | |
e06c0feb NS |
285 | "Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates", |
286 | 1000, 0, 0) | |
45b9a14b BS |
287 | /* A cutoff to avoid costly computations of the number of iterations in |
288 | the doloop transformation. */ | |
289 | DEFPARAM(PARAM_MAX_ITERATIONS_COMPUTATION_COST, | |
290 | "max-iterations-computation-cost", | |
291 | "Bound on the cost of an expression to compute the number of iterations", | |
292 | 10, 0, 0) | |
e9eb809d | 293 | |
e5626198 AZ |
294 | /* This parameter is used to tune SMS MAX II calculations. */ |
295 | DEFPARAM(PARAM_SMS_MAX_II_FACTOR, | |
296 | "sms-max-ii-factor", | |
e06c0feb NS |
297 | "A factor for tuning the upper bound that swing modulo scheduler uses for scheduling a loop", |
298 | 100, 0, 0) | |
e5626198 AZ |
299 | DEFPARAM(PARAM_SMS_DFA_HISTORY, |
300 | "sms-dfa-history", | |
5fa534e3 | 301 | "The number of cycles the swing modulo scheduler considers when checking conflicts using DFA", |
e06c0feb | 302 | 0, 0, 0) |
e5626198 AZ |
303 | DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD, |
304 | "sms-loop-average-count-threshold", | |
e06c0feb NS |
305 | "A threshold on the average loop count considered by the swing modulo scheduler", |
306 | 0, 0, 0) | |
e5626198 | 307 | |
194734e9 JH |
308 | DEFPARAM(HOT_BB_COUNT_FRACTION, |
309 | "hot-bb-count-fraction", | |
e06c0feb NS |
310 | "Select fraction of the maximal count of repetitions of basic block in program given basic block needs to have to be considered hot", |
311 | 10000, 0, 0) | |
194734e9 JH |
312 | DEFPARAM(HOT_BB_FREQUENCY_FRACTION, |
313 | "hot-bb-frequency-fraction", | |
e06c0feb NS |
314 | "Select fraction of the maximal frequency of executions of basic block in function given basic block needs to have to be considered hot", |
315 | 1000, 0, 0) | |
95b9a3a5 | 316 | |
edbed3d3 JH |
317 | DEFPARAM (PARAM_ALIGN_THRESHOLD, |
318 | "align-threshold", | |
319 | "Select fraction of the maximal frequency of executions of basic block in function given basic block get alignment", | |
320 | 100, 0, 0) | |
321 | ||
322 | DEFPARAM (PARAM_ALIGN_LOOP_ITERATIONS, | |
323 | "align-loop-iterations", | |
324 | "Loops iterating at least selected number of iterations will get loop alignement.", | |
325 | 4, 0, 0) | |
326 | ||
95b9a3a5 JH |
327 | /* For guessed profiles, the loops having unknown number of iterations |
328 | are predicted to iterate relatively few (10) times at average. | |
329 | For functions containing one loop with large known number of iterations | |
330 | and other loops having unbounded loops we would end up predicting all | |
c83eecad | 331 | the other loops cold that is not usually the case. So we need to artificially |
b8698a0f | 332 | flatten the profile. |
95b9a3a5 | 333 | |
6416ae7f | 334 | We need to cut the maximal predicted iterations to large enough iterations |
95b9a3a5 JH |
335 | so the loop appears important, but safely within HOT_BB_COUNT_FRACTION |
336 | range. */ | |
337 | ||
338 | DEFPARAM(PARAM_MAX_PREDICTED_ITERATIONS, | |
339 | "max-predicted-iterations", | |
340 | "The maximum number of loop iterations we predict statically", | |
341 | 100, 0, 0) | |
5c856b23 JH |
342 | DEFPARAM(TRACER_DYNAMIC_COVERAGE_FEEDBACK, |
343 | "tracer-dynamic-coverage-feedback", | |
e06c0feb NS |
344 | "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is available", |
345 | 95, 0, 100) | |
5c856b23 JH |
346 | DEFPARAM(TRACER_DYNAMIC_COVERAGE, |
347 | "tracer-dynamic-coverage", | |
e06c0feb NS |
348 | "The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is not available", |
349 | 75, 0, 100) | |
5c856b23 JH |
350 | DEFPARAM(TRACER_MAX_CODE_GROWTH, |
351 | "tracer-max-code-growth", | |
2cc98056 | 352 | "Maximal code growth caused by tail duplication (in percent)", |
e06c0feb | 353 | 100, 0, 0) |
5c856b23 JH |
354 | DEFPARAM(TRACER_MIN_BRANCH_RATIO, |
355 | "tracer-min-branch-ratio", | |
e06c0feb NS |
356 | "Stop reverse growth if the reverse probability of best edge is less than this threshold (in percent)", |
357 | 10, 0, 100) | |
5c856b23 JH |
358 | DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY_FEEDBACK, |
359 | "tracer-min-branch-probability-feedback", | |
e06c0feb NS |
360 | "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is available", |
361 | 80, 0, 100) | |
5c856b23 JH |
362 | DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY, |
363 | "tracer-min-branch-probability", | |
e06c0feb NS |
364 | "Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is not available", |
365 | 50, 0, 100) | |
3788cc17 | 366 | |
5f24e0dc RH |
367 | /* The maximum number of incoming edges to consider for crossjumping. */ |
368 | DEFPARAM(PARAM_MAX_CROSSJUMP_EDGES, | |
369 | "max-crossjump-edges", | |
370 | "The maximum number of incoming edges to consider for crossjumping", | |
e06c0feb | 371 | 100, 0, 0) |
5f24e0dc | 372 | |
12183e0f PH |
373 | /* The minimum number of matching instructions to consider for crossjumping. */ |
374 | DEFPARAM(PARAM_MIN_CROSSJUMP_INSNS, | |
375 | "min-crossjump-insns", | |
376 | "The minimum number of matching instructions to consider for crossjumping", | |
e06c0feb | 377 | 5, 0, 0) |
12183e0f | 378 | |
f935b9e0 DE |
379 | /* The maximum number expansion factor when copying basic blocks. */ |
380 | DEFPARAM(PARAM_MAX_GROW_COPY_BB_INSNS, | |
381 | "max-grow-copy-bb-insns", | |
382 | "The maximum expansion factor when copying basic blocks", | |
383 | 8, 0, 0) | |
384 | ||
bbcb0c05 SB |
385 | /* The maximum number of insns to duplicate when unfactoring computed gotos. */ |
386 | DEFPARAM(PARAM_MAX_GOTO_DUPLICATION_INSNS, | |
387 | "max-goto-duplication-insns", | |
388 | "The maximum number of insns to duplicate when unfactoring computed gotos", | |
389 | 8, 0, 0) | |
390 | ||
9bf8cfbf ZD |
391 | /* The maximum length of path considered in cse. */ |
392 | DEFPARAM(PARAM_MAX_CSE_PATH_LENGTH, | |
393 | "max-cse-path-length", | |
2cc98056 | 394 | "The maximum length of path considered in cse", |
e06c0feb | 395 | 10, 0, 0) |
95b9a3a5 | 396 | DEFPARAM(PARAM_MAX_CSE_INSNS, |
921b02cd | 397 | "max-cse-insns", |
95b9a3a5 JH |
398 | "The maximum instructions CSE process before flushing", |
399 | 1000, 0, 0) | |
9bf8cfbf | 400 | |
a7e5372d ZD |
401 | /* The cost of expression in loop invariant motion that is considered |
402 | expensive. */ | |
403 | DEFPARAM(PARAM_LIM_EXPENSIVE, | |
404 | "lim-expensive", | |
405 | "The minimum cost of an expensive expression in the loop invariant motion", | |
e06c0feb | 406 | 20, 0, 0) |
a7e5372d | 407 | |
8b11a64c ZD |
408 | /* Bound on number of candidates for induction variables below that |
409 | all candidates are considered for each use in induction variable | |
410 | optimizations. */ | |
411 | ||
412 | DEFPARAM(PARAM_IV_CONSIDER_ALL_CANDIDATES_BOUND, | |
413 | "iv-consider-all-candidates-bound", | |
414 | "Bound on number of candidates below that all candidates are considered in iv optimizations", | |
e06c0feb | 415 | 30, 0, 0) |
8b11a64c ZD |
416 | |
417 | /* The induction variable optimizations give up on loops that contain more | |
418 | induction variable uses. */ | |
419 | ||
420 | DEFPARAM(PARAM_IV_MAX_CONSIDERED_USES, | |
421 | "iv-max-considered-uses", | |
422 | "Bound on number of iv uses in loop optimized in iv optimizations", | |
e06c0feb | 423 | 250, 0, 0) |
8b11a64c | 424 | |
36f5ada1 ZD |
425 | /* If there are at most this number of ivs in the set, try removing unnecessary |
426 | ivs from the set always. */ | |
427 | ||
428 | DEFPARAM(PARAM_IV_ALWAYS_PRUNE_CAND_SET_BOUND, | |
429 | "iv-always-prune-cand-set-bound", | |
430 | "If number of candidates in the set is smaller, we always try to remove unused ivs during its optimization", | |
431 | 10, 0, 0) | |
432 | ||
2412d35c SP |
433 | DEFPARAM(PARAM_SCEV_MAX_EXPR_SIZE, |
434 | "scev-max-expr-size", | |
435 | "Bound on size of expressions used in the scalar evolutions analyzer", | |
436 | 20, 0, 0) | |
437 | ||
3d8864c0 SP |
438 | DEFPARAM(PARAM_OMEGA_MAX_VARS, |
439 | "omega-max-vars", | |
440 | "Bound on the number of variables in Omega constraint systems", | |
441 | 128, 0, 0) | |
442 | ||
443 | DEFPARAM(PARAM_OMEGA_MAX_GEQS, | |
444 | "omega-max-geqs", | |
445 | "Bound on the number of inequalities in Omega constraint systems", | |
446 | 256, 0, 0) | |
447 | ||
448 | DEFPARAM(PARAM_OMEGA_MAX_EQS, | |
449 | "omega-max-eqs", | |
450 | "Bound on the number of equalities in Omega constraint systems", | |
451 | 128, 0, 0) | |
452 | ||
453 | DEFPARAM(PARAM_OMEGA_MAX_WILD_CARDS, | |
454 | "omega-max-wild-cards", | |
455 | "Bound on the number of wild cards in Omega constraint systems", | |
456 | 18, 0, 0) | |
457 | ||
458 | DEFPARAM(PARAM_OMEGA_HASH_TABLE_SIZE, | |
459 | "omega-hash-table-size", | |
460 | "Bound on the size of the hash table in Omega constraint systems", | |
461 | 550, 0, 0) | |
462 | ||
463 | DEFPARAM(PARAM_OMEGA_MAX_KEYS, | |
464 | "omega-max-keys", | |
465 | "Bound on the number of keys in Omega constraint systems", | |
466 | 500, 0, 0) | |
467 | ||
468 | DEFPARAM(PARAM_OMEGA_ELIMINATE_REDUNDANT_CONSTRAINTS, | |
469 | "omega-eliminate-redundant-constraints", | |
470 | "When set to 1, use expensive methods to eliminate all redundant constraints", | |
471 | 0, 0, 1) | |
472 | ||
bc1edb77 VK |
473 | DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS, |
474 | "vect-max-version-for-alignment-checks", | |
475 | "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alignment check", | |
c12cc930 KB |
476 | 6, 0, 0) |
477 | ||
bc1edb77 VK |
478 | DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS, |
479 | "vect-max-version-for-alias-checks", | |
480 | "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alias check", | |
481 | 10, 0, 0) | |
482 | ||
c65ecebc JH |
483 | DEFPARAM(PARAM_MAX_CSELIB_MEMORY_LOCATIONS, |
484 | "max-cselib-memory-locations", | |
485 | "The maximum memory locations recorded by cselib", | |
e06c0feb | 486 | 500, 0, 0) |
c65ecebc | 487 | |
3788cc17 ZW |
488 | #ifdef ENABLE_GC_ALWAYS_COLLECT |
489 | # define GGC_MIN_EXPAND_DEFAULT 0 | |
737c38d1 | 490 | # define GGC_MIN_HEAPSIZE_DEFAULT 0 |
3788cc17 ZW |
491 | #else |
492 | # define GGC_MIN_EXPAND_DEFAULT 30 | |
737c38d1 | 493 | # define GGC_MIN_HEAPSIZE_DEFAULT 4096 |
3788cc17 ZW |
494 | #endif |
495 | ||
496 | DEFPARAM(GGC_MIN_EXPAND, | |
497 | "ggc-min-expand", | |
e06c0feb NS |
498 | "Minimum heap expansion to trigger garbage collection, as a percentage of the total size of the heap", |
499 | GGC_MIN_EXPAND_DEFAULT, 0, 0) | |
3788cc17 | 500 | |
3788cc17 ZW |
501 | DEFPARAM(GGC_MIN_HEAPSIZE, |
502 | "ggc-min-heapsize", | |
2cc98056 | 503 | "Minimum heap size before we start collecting garbage, in kilobytes", |
e06c0feb | 504 | GGC_MIN_HEAPSIZE_DEFAULT, 0, 0) |
737c38d1 GK |
505 | |
506 | #undef GGC_MIN_EXPAND_DEFAULT | |
507 | #undef GGC_MIN_HEAPSIZE_DEFAULT | |
3788cc17 | 508 | |
0bcf8261 JH |
509 | DEFPARAM(PARAM_MAX_RELOAD_SEARCH_INSNS, |
510 | "max-reload-search-insns", | |
511 | "The maximum number of instructions to search backward when looking for equivalent reload", | |
e06c0feb | 512 | 100, 0, 0) |
0bcf8261 | 513 | |
f72c6b56 DE |
514 | DEFPARAM(PARAM_MAX_SCHED_REGION_BLOCKS, |
515 | "max-sched-region-blocks", | |
516 | "The maximum number of blocks in a region to be considered for interblock scheduling", | |
e06c0feb | 517 | 10, 0, 0) |
f72c6b56 DE |
518 | |
519 | DEFPARAM(PARAM_MAX_SCHED_REGION_INSNS, | |
520 | "max-sched-region-insns", | |
521 | "The maximum number of insns in a region to be considered for interblock scheduling", | |
e06c0feb | 522 | 100, 0, 0) |
f72c6b56 | 523 | |
e855c69d AB |
524 | DEFPARAM(PARAM_MAX_PIPELINE_REGION_BLOCKS, |
525 | "max-pipeline-region-blocks", | |
526 | "The maximum number of blocks in a region to be considered for interblock scheduling", | |
527 | 15, 0, 0) | |
528 | ||
529 | DEFPARAM(PARAM_MAX_PIPELINE_REGION_INSNS, | |
530 | "max-pipeline-region-insns", | |
531 | "The maximum number of insns in a region to be considered for interblock scheduling", | |
532 | 200, 0, 0) | |
533 | ||
6f48c21a PS |
534 | DEFPARAM(PARAM_MIN_SPEC_PROB, |
535 | "min-spec-prob", | |
536 | "The minimum probability of reaching a source block for interblock speculative scheduling", | |
537 | 40, 0, 0) | |
538 | ||
d08eefb9 MK |
539 | DEFPARAM(PARAM_MAX_SCHED_EXTEND_REGIONS_ITERS, |
540 | "max-sched-extend-regions-iters", | |
541 | "The maximum number of iterations through CFG to extend regions", | |
bb83aa4b | 542 | 0, 0, 0) |
d08eefb9 | 543 | |
496d7bb0 MK |
544 | DEFPARAM(PARAM_MAX_SCHED_INSN_CONFLICT_DELAY, |
545 | "max-sched-insn-conflict-delay", | |
546 | "The maximum conflict delay for an insn to be considered for speculative motion", | |
547 | 3, 1, 10) | |
548 | ||
549 | DEFPARAM(PARAM_SCHED_SPEC_PROB_CUTOFF, | |
550 | "sched-spec-prob-cutoff", | |
551 | "The minimal probability of speculation success (in percents), so that speculative insn will be scheduled.", | |
552 | 40, 0, 100) | |
553 | ||
e855c69d AB |
554 | DEFPARAM(PARAM_SELSCHED_MAX_LOOKAHEAD, |
555 | "selsched-max-lookahead", | |
556 | "The maximum size of the lookahead window of selective scheduling", | |
557 | 50, 0, 0) | |
558 | ||
559 | DEFPARAM(PARAM_SELSCHED_MAX_SCHED_TIMES, | |
560 | "selsched-max-sched-times", | |
561 | "Maximum number of times that an insn could be scheduled", | |
562 | 2, 0, 0) | |
563 | ||
564 | DEFPARAM(PARAM_SELSCHED_INSNS_TO_RENAME, | |
565 | "selsched-insns-to-rename", | |
566 | "Maximum number of instructions in the ready list that are considered eligible for renaming", | |
567 | 2, 0, 0) | |
568 | ||
569 | DEFPARAM (PARAM_SCHED_MEM_TRUE_DEP_COST, | |
570 | "sched-mem-true-dep-cost", | |
571 | "Minimal distance between possibly conflicting store and load", | |
572 | 1, 0, 0) | |
573 | ||
49c3b9a8 JJ |
574 | DEFPARAM(PARAM_MAX_LAST_VALUE_RTL, |
575 | "max-last-value-rtl", | |
576 | "The maximum number of RTL nodes that can be recorded as combiner's last value", | |
577 | 10000, 0, 0) | |
578 | ||
89b0433e NS |
579 | /* INTEGER_CST nodes are shared for values [{-1,0} .. N) for |
580 | {signed,unsigned} integral types. This determines N. | |
581 | Experimentation shows 256 to be a good value. */ | |
582 | DEFPARAM (PARAM_INTEGER_SHARE_LIMIT, | |
583 | "integer-share-limit", | |
584 | "The upper bound for sharing integer constants", | |
e06c0feb | 585 | 256, 2, 2) |
89b0433e | 586 | |
84d65814 DN |
587 | /* Incremental SSA updates for virtual operands may be very slow if |
588 | there is a large number of mappings to process. In those cases, it | |
589 | is faster to rewrite the virtual symbols from scratch as if they | |
590 | had been recently introduced. This heuristic cannot be applied to | |
591 | SSA mappings for real SSA names, only symbols kept in FUD chains. | |
592 | ||
593 | PARAM_MIN_VIRTUAL_MAPPINGS specifies the minimum number of virtual | |
594 | mappings that should be registered to trigger the heuristic. | |
b8698a0f | 595 | |
84d65814 DN |
596 | PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO specifies the ratio between |
597 | mappings and symbols. If the number of virtual mappings is | |
598 | PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO bigger than the number of | |
599 | virtual symbols to be updated, then the updater switches to a full | |
600 | update for those symbols. */ | |
601 | DEFPARAM (PARAM_MIN_VIRTUAL_MAPPINGS, | |
602 | "min-virtual-mappings", | |
603 | "Minimum number of virtual mappings to consider switching to full virtual renames", | |
604 | 100, 0, 0) | |
605 | ||
606 | DEFPARAM (PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO, | |
607 | "virtual-mappings-ratio", | |
608 | "Ratio between virtual mappings and virtual symbols to do full virtual renames", | |
609 | 3, 0, 0) | |
610 | ||
7d69de61 RH |
611 | DEFPARAM (PARAM_SSP_BUFFER_SIZE, |
612 | "ssp-buffer-size", | |
613 | "The lower bound for a buffer to be considered for stack smashing protection", | |
614 | 8, 1, 0) | |
615 | ||
43f31be5 JL |
616 | /* When we thread through a block we have to make copies of the |
617 | statements within the block. Clearly for large blocks the code | |
618 | duplication is bad. | |
619 | ||
620 | PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS specifies the maximum number | |
621 | of statements and PHI nodes allowed in a block which is going to | |
622 | be duplicated for thread jumping purposes. | |
623 | ||
624 | Some simple analysis showed that more than 99% of the jump | |
625 | threading opportunities are for blocks with less than 15 | |
626 | statements. So we can get the benefits of jump threading | |
627 | without excessive code bloat for pathological cases with the | |
628 | throttle set at 15 statements. */ | |
629 | DEFPARAM (PARAM_MAX_JUMP_THREAD_DUPLICATION_STMTS, | |
630 | "max-jump-thread-duplication-stmts", | |
631 | "Maximum number of statements allowed in a block that needs to be duplicated when threading jumps", | |
632 | 15, 0, 0) | |
98035a75 DB |
633 | |
634 | /* This is the maximum number of fields a variable may have before the pointer analysis machinery | |
b8698a0f | 635 | will stop trying to treat it in a field-sensitive manner. |
98035a75 DB |
636 | There are programs out there with thousands of fields per structure, and handling them |
637 | field-sensitively is not worth the cost. */ | |
638 | DEFPARAM (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE, | |
639 | "max-fields-for-field-sensitive", | |
640 | "Maximum number of fields in a structure before pointer analysis treats the structure as a single variable", | |
d9338cf0 | 641 | 0, 0, 0) |
6f8dd94b EB |
642 | |
643 | DEFPARAM(PARAM_MAX_SCHED_READY_INSNS, | |
644 | "max-sched-ready-insns", | |
645 | "The maximum number of instructions ready to be issued to be considered by the scheduler during the first scheduling pass", | |
646 | 100, 0, 0) | |
647 | ||
47eb5b32 ZD |
648 | /* Prefetching and cache-optimizations related parameters. Default values are |
649 | usually set by machine description. */ | |
650 | ||
651 | /* The number of insns executed before prefetch is completed. */ | |
652 | ||
653 | DEFPARAM (PARAM_PREFETCH_LATENCY, | |
654 | "prefetch-latency", | |
655 | "The number of insns executed before prefetch is completed", | |
656 | 200, 0, 0) | |
657 | ||
658 | /* The number of prefetches that can run at the same time. */ | |
659 | ||
660 | DEFPARAM (PARAM_SIMULTANEOUS_PREFETCHES, | |
661 | "simultaneous-prefetches", | |
662 | "The number of prefetches that can run at the same time", | |
663 | 3, 0, 0) | |
664 | ||
46cb0441 | 665 | /* The size of L1 cache in kB. */ |
47eb5b32 ZD |
666 | |
667 | DEFPARAM (PARAM_L1_CACHE_SIZE, | |
668 | "l1-cache-size", | |
669 | "The size of L1 cache", | |
46cb0441 | 670 | 64, 0, 0) |
47eb5b32 ZD |
671 | |
672 | /* The size of L1 cache line in bytes. */ | |
673 | ||
674 | DEFPARAM (PARAM_L1_CACHE_LINE_SIZE, | |
675 | "l1-cache-line-size", | |
676 | "The size of L1 cache line", | |
677 | 32, 0, 0) | |
678 | ||
46cb0441 ZD |
679 | /* The size of L2 cache in kB. */ |
680 | ||
681 | DEFPARAM (PARAM_L2_CACHE_SIZE, | |
682 | "l2-cache-size", | |
683 | "The size of L2 cache", | |
684 | 512, 0, 0) | |
685 | ||
7313518b DG |
686 | /* Whether we should use canonical types rather than deep "structural" |
687 | type checking. Setting this value to 1 (the default) improves | |
688 | compilation performance in the C++ and Objective-C++ front end; | |
689 | this value should only be set to zero to work around bugs in the | |
690 | canonical type system by disabling it. */ | |
691 | ||
692 | DEFPARAM (PARAM_USE_CANONICAL_TYPES, | |
693 | "use-canonical-types", | |
694 | "Whether to use canonical types", | |
695 | 1, 0, 1) | |
f0ed4cfb NC |
696 | |
697 | DEFPARAM (PARAM_MAX_PARTIAL_ANTIC_LENGTH, | |
698 | "max-partial-antic-length", | |
699 | "Maximum length of partial antic set when performing tree pre optimization", | |
700 | 100, 0, 0) | |
701 | ||
863d2a57 RG |
702 | /* The following is used as a stop-gap limit for cases where really huge |
703 | SCCs blow up memory and compile-time use too much. If we hit this limit, | |
704 | SCCVN and such FRE and PRE will be not done at all for the current | |
705 | function. */ | |
706 | ||
707 | DEFPARAM (PARAM_SCCVN_MAX_SCC_SIZE, | |
708 | "sccvn-max-scc-size", | |
709 | "Maximum size of a SCC before SCCVN stops processing a function", | |
710 | 10000, 10, 0) | |
711 | ||
058e97ec VM |
712 | DEFPARAM (PARAM_IRA_MAX_LOOPS_NUM, |
713 | "ira-max-loops-num", | |
7b98c16f | 714 | "Max loops number for regional RA", |
30ea859e | 715 | 100, 0, 0) |
058e97ec | 716 | |
311aab06 VM |
717 | DEFPARAM (PARAM_IRA_MAX_CONFLICT_TABLE_SIZE, |
718 | "ira-max-conflict-table-size", | |
7b98c16f | 719 | "Max size of conflict table in MB", |
7cd06356 | 720 | 1000, 0, 0) |
311aab06 | 721 | |
1833192f VM |
722 | DEFPARAM (PARAM_IRA_LOOP_RESERVED_REGS, |
723 | "ira-loop-reserved-regs", | |
724 | "The number of registers in each class kept unused by loop invariant motion", | |
725 | 2, 0, 0) | |
726 | ||
b6e99746 MJ |
727 | /* Switch initialization conversion will refuse to create arrays that are |
728 | bigger than this parameter times the number of switch branches. */ | |
729 | ||
730 | DEFPARAM (PARAM_SWITCH_CONVERSION_BRANCH_RATIO, | |
731 | "switch-conversion-max-branch-ratio", | |
732 | "The maximum ratio between array size and switch branches for " | |
733 | "a switch conversion to take place", | |
734 | 8, 1, 0) | |
735 | ||
e797c5f2 SP |
736 | /* Size of tiles when doing loop blocking. */ |
737 | ||
738 | DEFPARAM (PARAM_LOOP_BLOCK_TILE_SIZE, | |
739 | "loop-block-tile-size", | |
740 | "size of tiles for loop blocking", | |
741 | 51, 0, 0) | |
742 | ||
b1fb9f56 JJ |
743 | /* Avoid doing loop invariant motion on very large loops. */ |
744 | ||
745 | DEFPARAM (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP, | |
746 | "loop-invariant-max-bbs-in-loop", | |
7b98c16f | 747 | "Max basic blocks number in loop for loop invariant motion", |
b1fb9f56 JJ |
748 | 10000, 0, 0) |
749 | ||
a70d6342 IR |
750 | /* Avoid SLP vectorization of large basic blocks. */ |
751 | DEFPARAM (PARAM_SLP_MAX_INSNS_IN_BB, | |
752 | "slp-max-insns-in-bb", | |
753 | "Maximum number of instructions in basic block to be considered for SLP vectorization", | |
754 | 1000, 0, 0) | |
755 | ||
db34470d GS |
756 | DEFPARAM (PARAM_MIN_INSN_TO_PREFETCH_RATIO, |
757 | "min-insn-to-prefetch-ratio", | |
7b98c16f | 758 | "Min. ratio of insns to prefetches to enable prefetching for " |
db34470d GS |
759 | "a loop with an unknown trip count", |
760 | 10, 0, 0) | |
761 | ||
762 | DEFPARAM (PARAM_PREFETCH_MIN_INSN_TO_MEM_RATIO, | |
763 | "prefetch-min-insn-to-mem-ratio", | |
7b98c16f | 764 | "Min. ratio of insns to mem ops to enable prefetching in a loop", |
db34470d GS |
765 | 3, 0, 0) |
766 | ||
ec8c3978 JJ |
767 | /* Set maximum hash table size for var tracking. */ |
768 | ||
769 | DEFPARAM (PARAM_MAX_VARTRACK_SIZE, | |
770 | "max-vartrack-size", | |
771 | "Max. size of var tracking hash tables", | |
772 | 50000000, 0, 0) | |
773 | ||
b5b8b0ac AO |
774 | /* Set minimum insn uid for non-debug insns. */ |
775 | ||
776 | DEFPARAM (PARAM_MIN_NONDEBUG_INSN_UID, | |
777 | "min-nondebug-insn-uid", | |
778 | "The minimum UID to be used for a nondebug insn", | |
779 | 0, 1, 0) | |
780 | ||
07ffa034 MJ |
781 | DEFPARAM (PARAM_IPA_SRA_PTR_GROWTH_FACTOR, |
782 | "ipa-sra-ptr-growth-factor", | |
7b98c16f | 783 | "Maximum allowed growth of size of new parameters ipa-sra replaces " |
07ffa034 MJ |
784 | "a pointer to an aggregate with", |
785 | 2, 0, 0) | |
786 | ||
c6d9a88c MM |
787 | /* |
788 | Local variables: | |
789 | mode:c | |
f4b4a3e2 NC |
790 | End: |
791 | */ |