1 /*
2 * Copyright (c) 2000, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
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8 *
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23 */
24
25 #ifndef SHARE_OPTO_C2_GLOBALS_HPP
26 #define SHARE_OPTO_C2_GLOBALS_HPP
27
28 #include "opto/c2_globals_pd.hpp"
29 #include "runtime/globals_shared.hpp"
30 #include "utilities/macros.hpp"
31
32 //
33 // Defines all globals flags used by the server compiler.
34 //
35
36 #define C2_FLAGS(develop, \
37 develop_pd, \
38 product, \
39 product_pd, \
40 range, \
41 constraint) \
42 \
43 product(bool, StressLCM, false, DIAGNOSTIC, \
44 "Randomize instruction scheduling in LCM") \
45 \
46 product(bool, StressGCM, false, DIAGNOSTIC, \
47 "Randomize instruction scheduling in GCM") \
48 \
49 product(bool, StressIGVN, false, DIAGNOSTIC, \
50 "Randomize worklist traversal in IGVN") \
51 \
52 product(bool, StressCCP, false, DIAGNOSTIC, \
53 "Randomize worklist traversal in CCP") \
54 \
55 product(bool, StressIncrementalInlining, false, DIAGNOSTIC, \
56 "Randomize the incremental inlining decision") \
57 \
58 product(bool, StressMacroExpansion, false, DIAGNOSTIC, \
59 "Randomize macro node expansion order") \
60 \
61 product(bool, StressUnstableIfTraps, false, DIAGNOSTIC, \
62 "Randomly take unstable if traps") \
63 \
64 product(uint, StressSeed, 0, DIAGNOSTIC, \
65 "Seed for randomized stress testing (if unset, a random one is " \
66 "generated). The seed is recorded in the compilation log, if " \
67 "available.") \
68 range(0, max_juint) \
69 \
70 develop(bool, StressMethodHandleLinkerInlining, false, \
71 "Stress inlining through method handle linkers") \
72 \
73 develop(bool, StressBailout, false, \
74 "Perform bailouts randomly at C2 failing() checks") \
75 \
76 develop(uint, StressBailoutMean, 100000, \
77 "The expected number of failing() checks made until " \
78 "a random bailout.") \
79 range(1, max_juint) \
80 \
81 develop(intx, OptoPrologueNops, 0, \
82 "Insert this many extra nop instructions " \
83 "in the prologue of every nmethod") \
84 range(0, 128) \
85 \
86 product_pd(intx, InteriorEntryAlignment, \
87 "Code alignment for interior entry points " \
88 "in generated code (in bytes)") \
89 constraint(InteriorEntryAlignmentConstraintFunc, AfterErgo) \
90 \
91 product(intx, MaxLoopPad, (OptoLoopAlignment-1), \
92 "Align a loop if padding size in bytes is less or equal to this " \
93 "value") \
94 range(0, max_jint) \
95 \
96 product(intx, MaxVectorSize, 64, \
97 "Max vector size in bytes, " \
98 "actual size could be less depending on elements type") \
99 range(0, max_jint) \
100 \
101 product(intx, ArrayOperationPartialInlineSize, 0, DIAGNOSTIC, \
102 "Partial inline size used for small array operations" \
103 "(e.g. copy,cmp) acceleration.") \
104 range(0, 256) \
105 \
106 product(bool, AlignVector, true, \
107 "Perform vector store/load alignment in loop") \
108 \
109 develop(bool, VerifyAlignVector, false, \
110 "Check that vector stores/loads are aligned if AlignVector" \
111 "is enabled.") \
112 \
113 product(intx, NumberOfLoopInstrToAlign, 4, \
114 "Number of first instructions in a loop to align") \
115 range(0, max_jint) \
116 \
117 develop(intx, IndexSetWatch, 0, \
118 "Trace all operations on this IndexSet (-1 means all, 0 none)") \
119 range(-1, max_intx) \
120 \
121 develop(intx, OptoNodeListSize, 4, \
122 "Starting allocation size of Node_List data structures") \
123 range(1, max_jint) \
124 \
125 develop(intx, OptoBlockListSize, 8, \
126 "Starting allocation size of Block_List data structures") \
127 range(1, max_jint) \
128 \
129 develop(intx, OptoPeepholeAt, -1, \
130 "Apply peephole optimizations to this peephole rule") \
131 \
132 develop(bool, PrintIdeal, false, \
133 "Print ideal graph before code generation") \
134 \
135 develop(bool, PrintOpto, false, \
136 "Print compiler2 attempts") \
137 \
138 develop(bool, PrintOptoInlining, false, \
139 "Print compiler2 inlining decisions") \
140 \
141 develop(bool, VerifyIdealNodeCount, false, \
142 "Verify that tracked dead ideal node count is accurate") \
143 \
144 develop(bool, PrintIdealNodeCount, false, \
145 "Print liveness counts of ideal nodes") \
146 \
147 product_pd(bool, IdealizeClearArrayNode, DIAGNOSTIC, \
148 "Replace ClearArrayNode by subgraph of basic operations.") \
149 \
150 develop(bool, OptoBreakpoint, false, \
151 "insert breakpoint at method entry") \
152 \
153 develop(bool, OptoBreakpointOSR, false, \
154 "insert breakpoint at osr method entry") \
155 \
156 develop(uint64_t, BreakAtNode, 0, \
157 "Break at construction of this Node (either _idx or _debug_idx)") \
158 \
159 develop(bool, OptoBreakpointC2R, false, \
160 "insert breakpoint at runtime stub entry") \
161 \
162 develop(bool, OptoNoExecute, false, \
163 "Attempt to parse and compile but do not execute generated code") \
164 \
165 develop(bool, PrintOptoStatistics, false, \
166 "Print New compiler statistics") \
167 \
168 product(bool, PrintOptoAssembly, false, DIAGNOSTIC, \
169 "Print New compiler assembly output") \
170 \
171 develop_pd(bool, OptoPeephole, \
172 "Apply peephole optimizations after register allocation") \
173 \
174 develop(bool, PrintFrameConverterAssembly, false, \
175 "Print New compiler assembly output for frame converters") \
176 \
177 develop(bool, PrintParseStatistics, false, \
178 "Print nodes, transforms and new values made per bytecode parsed")\
179 \
180 develop(bool, PrintOptoPeephole, false, \
181 "Print New compiler peephole replacements") \
182 \
183 develop(bool, PrintCFGBlockFreq, false, \
184 "Print CFG block frequencies") \
185 \
186 develop(bool, TraceOptoParse, false, \
187 "Trace bytecode parse and control-flow merge") \
188 \
189 product_pd(intx, LoopUnrollLimit, \
190 "Unroll loop bodies with node count less than this") \
191 range(0, max_jint / 4) \
192 \
193 product_pd(intx, LoopPercentProfileLimit, \
194 "Unroll loop bodies with % node count of profile limit") \
195 range(10, 100) \
196 \
197 product(intx, LoopMaxUnroll, 16, \
198 "Maximum number of unrolls for main loop") \
199 range(0, max_jint) \
200 \
201 product_pd(bool, SuperWordLoopUnrollAnalysis, \
202 "Map number of unrolls for main loop via " \
203 "Superword Level Parallelism analysis") \
204 \
205 develop(bool, TraceSuperWordLoopUnrollAnalysis, false, \
206 "Trace what Superword Level Parallelism analysis applies") \
207 \
208 product(bool, UseVectorMacroLogic, true, DIAGNOSTIC, \
209 "Use ternary macro logic instructions") \
210 \
211 product(intx, LoopUnrollMin, 4, \
212 "Minimum number of unroll loop bodies before checking progress" \
213 "of rounds of unroll,optimize,..") \
214 range(0, max_jint) \
215 \
216 product(bool, UseSubwordForMaxVector, true, \
217 "Use Subword Analysis to set maximum vector size") \
218 \
219 product(bool, UseVectorCmov, false, \
220 "Use Vectorized Cmov") \
221 \
222 develop(intx, UnrollLimitForProfileCheck, 1, \
223 "Don't use profile_trip_cnt() to restrict unrolling until " \
224 "unrolling would push the number of unrolled iterations above " \
225 "UnrollLimitForProfileCheck. A higher value allows more " \
226 "unrolling. Zero acts as a very large value." ) \
227 range(0, max_intx) \
228 \
229 product(intx, MultiArrayExpandLimit, 6, \
230 "Maximum number of individual allocations in an inline-expanded " \
231 "multianewarray instruction") \
232 range(0, max_jint) \
233 \
234 develop(bool, TraceProfileTripCount, false, \
235 "Trace profile loop trip count information") \
236 \
237 product(bool, UseCountedLoopSafepoints, false, \
238 "Force counted loops to keep a safepoint") \
239 \
240 product(bool, UseLoopPredicate, true, \
241 "Move checks with uncommon trap out of loops.") \
242 \
243 develop(bool, TraceLoopPredicate, false, \
244 "Trace generation of loop predicates") \
245 \
246 develop(bool, TraceLoopOpts, false, \
247 "Trace executed loop optimizations") \
248 \
249 develop(bool, TraceLoopLimitCheck, false, \
250 "Trace generation of loop limits checks") \
251 \
252 develop(bool, TraceRangeLimitCheck, false, \
253 "Trace additional overflow checks in RCE") \
254 \
255 /* OptimizeFill not yet supported on PowerPC. */ \
256 product(bool, OptimizeFill, true PPC64_ONLY(&& false), \
257 "convert fill/copy loops into intrinsic") \
258 \
259 develop(bool, TraceOptimizeFill, false, \
260 "print detailed information about fill conversion") \
261 \
262 develop(bool, OptoCoalesce, true, \
263 "Use Conservative Copy Coalescing in the Register Allocator") \
264 \
265 develop(bool, UseUniqueSubclasses, true, \
266 "Narrow an abstract reference to the unique concrete subclass") \
267 \
268 product(intx, TrackedInitializationLimit, 50, \
269 "When initializing fields, track up to this many words") \
270 range(0, 65535) \
271 \
272 product(bool, ReduceFieldZeroing, true, \
273 "When initializing fields, try to avoid needless zeroing") \
274 \
275 product(bool, ReduceInitialCardMarks, true, \
276 "When initializing fields, try to avoid needless card marks") \
277 \
278 product(bool, ReduceBulkZeroing, true, \
279 "When bulk-initializing, try to avoid needless zeroing") \
280 \
281 product(bool, UseFPUForSpilling, false, \
282 "Spill integer registers to FPU instead of stack when possible") \
283 \
284 develop_pd(intx, RegisterCostAreaRatio, \
285 "Spill selection in reg allocator: scale area by (X/64K) before " \
286 "adding cost") \
287 \
288 develop_pd(bool, UseCISCSpill, \
289 "Use ADLC supplied cisc instructions during allocation") \
290 \
291 develop(bool, VerifyGraphEdges , false, \
292 "Verify Bi-directional Edges") \
293 \
294 develop(bool, VerifyDUIterators, true, \
295 "Verify the safety of all iterations of Bi-directional Edges") \
296 \
297 develop(bool, VerifyHashTableKeys, true, \
298 "Verify the immutability of keys in the VN hash tables") \
299 \
300 develop(bool, VerifyRegisterAllocator , false, \
301 "Verify Register Allocator") \
302 \
303 develop(intx, FLOATPRESSURE, -1, \
304 "Number of float LRG's that constitute high register pressure." \
305 "-1: means the threshold is determined by number of available " \
306 "float register for allocation") \
307 range(-1, max_jint) \
308 \
309 develop(intx, INTPRESSURE, -1, \
310 "Number of integer LRG's that constitute high register pressure." \
311 "-1: means the threshold is determined by number of available " \
312 "integer register for allocation") \
313 range(-1, max_jint) \
314 \
315 develop(bool, TraceOptoPipelining, false, \
316 "Trace pipelining information") \
317 \
318 develop(bool, TraceOptoOutput, false, \
319 "Trace pipelining information") \
320 \
321 product_pd(bool, OptoScheduling, \
322 "Instruction Scheduling after register allocation") \
323 \
324 product_pd(bool, OptoRegScheduling, \
325 "Instruction Scheduling before register allocation for pressure") \
326 \
327 product(bool, PartialPeelLoop, true, \
328 "Partial peel (rotate) loops") \
329 \
330 product(intx, PartialPeelNewPhiDelta, 0, \
331 "Additional phis that can be created by partial peeling") \
332 range(0, max_jint) \
333 \
334 develop(bool, TracePartialPeeling, false, \
335 "Trace partial peeling (loop rotation) information") \
336 \
337 product(bool, PartialPeelAtUnsignedTests, true, \
338 "Partial peel at unsigned tests if no signed test exists") \
339 \
340 product(bool, ReassociateInvariants, true, \
341 "Enable reassociation of expressions with loop invariants.") \
342 \
343 product(bool, LoopUnswitching, true, \
344 "Enable loop unswitching (a form of invariant test hoisting)") \
345 \
346 develop(bool, TraceLoopUnswitching, false, \
347 "Trace loop unswitching") \
348 \
349 product(bool, LoopMultiversioning, true, DIAGNOSTIC, \
350 "Enable loop multiversioning (for speculative compilation)") \
351 \
352 develop(bool, TraceLoopMultiversioning, false, \
353 "Trace loop multiversioning") \
354 \
355 product(bool, AllowVectorizeOnDemand, true, \
356 "Globally suppress vectorization set in VectorizeMethod") \
357 \
358 product(bool, UseSuperWord, true, \
359 "Transform scalar operations into superword operations") \
360 \
361 product(bool, SuperWordReductions, true, \
362 "Enable reductions support in superword.") \
363 \
364 product_pd(uint, SuperWordStoreToLoadForwardingFailureDetection, DIAGNOSTIC, \
365 "if >0, auto-vectorization detects possible store-to-load " \
366 "forwarding failures. The number specifies over how many " \
367 "loop iterations this detection spans.") \
368 range(0, 4096) \
369 \
370 product(uint, SuperWordAutomaticAlignment, 1, DIAGNOSTIC, \
371 "0 = Disabled (unless AlignVector is enabled)" \
372 "Else: align with a load or store of the largest vector width," \
373 " and if there are loads and stores of the largest width:" \
374 "1 = Prefer alignment with vector store (default)" \
375 "2 = Prefer alignment with vector load.") \
376 range(0, 2) \
377 \
378 product(uint, AutoVectorizationOverrideProfitability, 1, DIAGNOSTIC, \
379 "Override the auto vectorization profitability heuristics." \
380 "0 = Run auto vectorizer, but abort just before applying" \
381 " vectorization, as though it was not profitable." \
382 "1 = Run auto vectorizer with the default profitability" \
383 " heuristics. This is the default, and hopefully" \
384 " delivers the best performance." \
385 "2 = Run auto vectorizer, and vectorize even if the" \
386 " profitability heuristics predict that vectorization" \
387 " is not profitable.") \
388 range(0, 2) \
389 \
390 product(bool, UseCMoveUnconditionally, false, \
391 "Use CMove (scalar and vector) ignoring profitability test.") \
392 \
393 develop(bool, TraceSuperWord, false, \
394 "Trace superword transforms") \
395 \
396 develop(bool, TraceNewVectors, false, \
397 "Trace creation of Vector nodes") \
398 \
399 product(bool, MergeStores, true, DIAGNOSTIC, \
400 "Optimize stores by combining values into larger store") \
401 \
402 product_pd(bool, OptoBundling, \
403 "Generate nops to fill i-cache lines") \
404 \
405 product_pd(intx, ConditionalMoveLimit, \
406 "Limit of ops to make speculative when using CMOVE") \
407 range(0, max_jint) \
408 \
409 develop(intx, PrintPhaseLevel, 0, \
410 "Level of detail of the phase trace print. " \
411 "System-wide value, -1=printing is disabled, " \
412 "0=print nothing except PhasePrintLevel directives, " \
413 "6=all details printed. " \
414 "Level of detail of printouts can be set on a per-method level " \
415 "as well by using CompileCommand=PrintPhaseLevel.") \
416 range(-1, 6) \
417 \
418 develop(bool, PrintIdealGraph, false, \
419 "Print ideal graph to XML file / network interface. " \
420 "By default attempts to connect to the visualizer on a socket.") \
421 \
422 develop(intx, PrintIdealGraphLevel, 0, \
423 "Level of detail of the ideal graph printout. " \
424 "System-wide value, -1=printing is disabled, " \
425 "0=print nothing except IGVPrintLevel directives, " \
426 "6=all details printed. " \
427 "Level of detail of printouts can be set on a per-method level " \
428 "as well by using CompileCommand=option.") \
429 range(-1, 6) \
430 \
431 develop(intx, PrintIdealGraphPort, 4444, \
432 "Ideal graph printer to network port") \
433 range(0, SHRT_MAX) \
434 \
435 develop(ccstr, PrintIdealGraphAddress, "127.0.0.1", \
436 "IP address to connect to visualizer") \
437 \
438 develop(ccstr, PrintIdealGraphFile, nullptr, \
439 "File to dump ideal graph to. If set overrides the " \
440 "use of the network") \
441 \
442 product(bool, UseBimorphicInlining, true, \
443 "Profiling based inlining for two receivers") \
444 \
445 product(bool, UseOnlyInlinedBimorphic, true, \
446 "Don't use BimorphicInlining if can't inline a second method") \
447 \
448 develop(bool, SubsumeLoads, true, \
449 "Attempt to compile while subsuming loads into machine " \
450 "instructions.") \
451 \
452 develop(bool, StressRecompilation, false, \
453 "Recompile each compiled method without subsuming loads " \
454 "or escape analysis.") \
455 \
456 develop(intx, ImplicitNullCheckThreshold, 3, \
457 "Don't do implicit null checks if NPE's in a method exceeds " \
458 "limit") \
459 range(0, max_jint) \
460 \
461 product(intx, LoopOptsCount, 43, \
462 "Set level of loop optimization for tier 1 compiles") \
463 range(5, max_jint) \
464 \
465 product(bool, OptimizeUnstableIf, true, DIAGNOSTIC, \
466 "Optimize UnstableIf traps") \
467 \
468 /* controls for heat-based inlining */ \
469 \
470 develop(intx, NodeCountInliningCutoff, 18000, \
471 "If parser node generation exceeds limit stop inlining") \
472 range(0, max_jint) \
473 \
474 product(intx, MaxNodeLimit, 80000, \
475 "Maximum number of nodes") \
476 range(1000, max_jint / 3) \
477 \
478 product(intx, NodeLimitFudgeFactor, 2000, \
479 "Fudge Factor for certain optimizations") \
480 constraint(NodeLimitFudgeFactorConstraintFunc, AfterErgo) \
481 \
482 product(bool, UseJumpTables, true, \
483 "Use JumpTables instead of a binary search tree for switches") \
484 \
485 product(bool, UseDivMod, true, \
486 "Use combined DivMod instruction if available") \
487 \
488 product_pd(intx, MinJumpTableSize, \
489 "Minimum number of targets in a generated jump table") \
490 range(0, max_intx) \
491 \
492 product(intx, MaxJumpTableSize, 65000, \
493 "Maximum number of targets in a generated jump table") \
494 range(0, max_intx) \
495 \
496 product(intx, MaxJumpTableSparseness, 5, \
497 "Maximum sparseness for jumptables") \
498 range(0, max_intx / 4) \
499 \
500 product(bool, EliminateLocks, true, \
501 "Coarsen locks when possible") \
502 \
503 product(bool, EliminateNestedLocks, true, \
504 "Eliminate nested locks of the same object when possible") \
505 \
506 develop(bool, PrintLockStatistics, false, \
507 "Print precise statistics on the dynamic lock usage") \
508 \
509 develop(bool, PrintEliminateLocks, false, \
510 "Print out when locks are eliminated") \
511 \
512 product(bool, EliminateAutoBox, true, \
513 "Control optimizations for autobox elimination") \
514 \
515 product(intx, AutoBoxCacheMax, 128, \
516 "Sets max value cached by the java.lang.Integer autobox cache") \
517 range(0, max_jint) \
518 \
519 product(bool, AggressiveUnboxing, true, DIAGNOSTIC, \
520 "Control optimizations for aggressive boxing elimination") \
521 \
522 develop(bool, TracePostallocExpand, false, "Trace expanding nodes after" \
523 " register allocation.") \
524 \
525 product(bool, ReduceAllocationMerges, true, DIAGNOSTIC, \
526 "Try to simplify allocation merges before Scalar Replacement") \
527 \
528 develop(bool, TraceReduceAllocationMerges, false, \
529 "Trace decision for simplifying allocation merges.") \
530 \
531 develop(bool, VerifyReduceAllocationMerges, true, \
532 "Verify reduce allocation merges in escape analysis") \
533 \
534 product(bool, DoEscapeAnalysis, true, \
535 "Perform escape analysis") \
536 \
537 product(double, EscapeAnalysisTimeout, 20. DEBUG_ONLY(+40.), \
538 "Abort EA when it reaches time limit (in sec)") \
539 range(0, DBL_MAX) \
540 \
541 develop(bool, ExitEscapeAnalysisOnTimeout, true, \
542 "Exit or throw assert in EA when it reaches time limit") \
543 \
544 develop(bool, PrintEscapeAnalysis, false, \
545 "Print the results of escape analysis") \
546 \
547 product(bool, EliminateAllocations, true, \
548 "Use escape analysis to eliminate allocations") \
549 \
550 develop(bool, PrintEliminateAllocations, false, \
551 "Print out when allocations are eliminated") \
552 \
553 product(intx, EliminateAllocationArraySizeLimit, 64, \
554 "Array size (number of elements) limit for scalar replacement") \
555 range(0, max_jint) \
556 \
557 product(intx, EliminateAllocationFieldsLimit, 512, DIAGNOSTIC, \
558 "Number of fields in instance limit for scalar replacement") \
559 range(0, max_jint) \
560 \
561 product(bool, OptimizePtrCompare, true, \
562 "Use escape analysis to optimize pointers compare") \
563 \
564 develop(bool, PrintOptimizePtrCompare, false, \
565 "Print information about optimized pointers compare") \
566 \
567 develop(bool, VerifyConnectionGraph , true, \
568 "Verify Connection Graph construction in Escape Analysis") \
569 \
570 product(bool, OptimizeStringConcat, true, \
571 "Optimize the construction of Strings by StringBuilder") \
572 \
573 develop(bool, PrintOptimizeStringConcat, false, \
574 "Print information about transformations performed on Strings") \
575 \
576 product(intx, ValueSearchLimit, 1000, \
577 "Recursion limit in PhaseMacroExpand::value_from_mem_phi") \
578 range(0, max_jint) \
579 \
580 product(intx, MaxLabelRootDepth, 1100, \
581 "Maximum times call Label_Root to prevent stack overflow") \
582 range(100, max_jint) \
583 \
584 product(intx, DominatorSearchLimit, 1000, DIAGNOSTIC, \
585 "Iterations limit in Node::dominates") \
586 range(0, max_jint) \
587 \
588 product(bool, BlockLayoutByFrequency, true, \
589 "Use edge frequencies to drive block ordering") \
590 \
591 product(intx, BlockLayoutMinDiamondPercentage, 20, \
592 "Minimum %% of a successor (predecessor) for which block " \
593 "layout a will allow a fork (join) in a single chain") \
594 range(0, 100) \
595 \
596 product(bool, BlockLayoutRotateLoops, true, \
597 "Allow back branches to be fall throughs in the block layout") \
598 \
599 product(bool, InlineReflectionGetCallerClass, true, DIAGNOSTIC, \
600 "inline sun.reflect.Reflection.getCallerClass(), known to be " \
601 "part of base library DLL") \
602 \
603 product(bool, InlineObjectCopy, true, DIAGNOSTIC, \
604 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
605 \
606 product(bool, SpecialStringCompareTo, true, DIAGNOSTIC, \
607 "special version of string compareTo") \
608 \
609 product(bool, SpecialStringIndexOf, true, DIAGNOSTIC, \
610 "special version of string indexOf") \
611 \
612 product(bool, SpecialStringEquals, true, DIAGNOSTIC, \
613 "special version of string equals") \
614 \
615 product(bool, SpecialArraysEquals, true, DIAGNOSTIC, \
616 "special version of Arrays.equals(char[],char[])") \
617 \
618 product(bool, SpecialEncodeISOArray, true, DIAGNOSTIC, \
619 "special version of ISO_8859_1$Encoder.encodeISOArray") \
620 \
621 develop(bool, BailoutToInterpreterForThrows, false, \
622 "Compiled methods which throws/catches exceptions will be " \
623 "deopt and intp.") \
624 \
625 develop(bool, ConvertCmpD2CmpF, true, \
626 "Convert cmpD to cmpF when one input is constant in float range") \
627 \
628 develop(bool, ConvertFloat2IntClipping, true, \
629 "Convert float2int clipping idiom to integer clipping") \
630 \
631 develop(bool, MonomorphicArrayCheck, true, \
632 "Uncommon-trap array store checks that require full type check") \
633 \
634 develop(bool, TracePhaseCCP, false, \
635 "Print progress during Conditional Constant Propagation") \
636 \
637 develop(bool, PrintDominators, false, \
638 "Print out dominator trees for GVN") \
639 \
640 product(bool, TraceSpilling, false, DIAGNOSTIC, \
641 "Trace spilling") \
642 \
643 product(bool, TraceTypeProfile, false, DIAGNOSTIC, \
644 "Trace type profile") \
645 \
646 develop(bool, PoisonOSREntry, true, \
647 "Detect abnormal calls to OSR code") \
648 \
649 develop(bool, SoftMatchFailure, trueInProduct, \
650 "If the DFA fails to match a node, print a message and bail out") \
651 \
652 develop(bool, InlineAccessors, true, \
653 "inline accessor methods (get/set)") \
654 \
655 product(intx, TypeProfileMajorReceiverPercent, 90, \
656 "% of major receiver type to all profiled receivers") \
657 range(0, 100) \
658 \
659 product(bool, PrintIntrinsics, false, DIAGNOSTIC, \
660 "prints attempted and successful inlining of intrinsics") \
661 \
662 develop(bool, StressReflectiveCode, false, \
663 "Use inexact types at allocations, etc., to test reflection") \
664 \
665 product(bool, DebugInlinedCalls, true, DIAGNOSTIC, \
666 "If false, restricts profiled locations to the root method only") \
667 \
668 develop(bool, VerifyLoopOptimizations, false, \
669 "verify major loop optimizations") \
670 \
671 develop(bool, VerifyNoNewIrreducibleLoops, false, \
672 "Verify that no new irreducible loops are created after parsing") \
673 \
674 product(bool, ProfileDynamicTypes, true, DIAGNOSTIC, \
675 "do extra type profiling and use it more aggressively") \
676 \
677 develop(bool, TraceIterativeGVN, false, \
678 "Print progress during Iterative Global Value Numbering") \
679 \
680 develop(uint, VerifyIterativeGVN, 0, \
681 "Verify Iterative Global Value Numbering" \
682 "=XY, with Y: verify Def-Use modifications during IGVN" \
683 " X: verify that type(n) == n->Value() after IGVN" \
684 "X and Y in 0=off; 1=on") \
685 constraint(VerifyIterativeGVNConstraintFunc, AtParse) \
686 \
687 develop(bool, TraceCISCSpill, false, \
688 "Trace allocators use of cisc spillable instructions") \
689 \
690 product(bool, SplitIfBlocks, true, \
691 "Clone compares and control flow through merge points to fold " \
692 "some branches") \
693 \
694 develop(intx, FreqCountInvocations, 1, \
695 "Scaling factor for branch frequencies (deprecated)") \
696 range(1, max_intx) \
697 \
698 develop(bool, VerifyAliases, false, \
699 "perform extra checks on the results of alias analysis") \
700 \
701 product(uint, VerifyConstraintCasts, 0, DIAGNOSTIC, \
702 "Perform runtime checks to verify the value of a " \
703 "ConstraintCast lies inside its type" \
704 "0 = does not perform any verification, " \
705 "1 = perform verification on ConstraintCastNodes that are " \
706 "present during code emission, " \
707 "2 = Do not do widening of ConstraintCastNodes so that we can " \
708 "have more verification coverage") \
709 range(0, 2) \
710 \
711 product(intx, MaxInlineLevel, 15, \
712 "maximum number of nested calls that are inlined by high tier " \
713 "compiler") \
714 range(0, max_jint) \
715 \
716 product(intx, MaxRecursiveInlineLevel, 1, \
717 "maximum number of nested recursive calls that are inlined by " \
718 "high tier compiler") \
719 range(0, max_jint) \
720 \
721 product_pd(intx, InlineSmallCode, \
722 "Only inline already compiled methods if their code size is " \
723 "less than this") \
724 range(0, max_jint) \
725 \
726 product(intx, MaxInlineSize, 35, \
727 "The maximum bytecode size of a method to be inlined by high " \
728 "tier compiler") \
729 range(0, max_jint) \
730 \
731 product_pd(intx, FreqInlineSize, \
732 "The maximum bytecode size of a frequent method to be inlined") \
733 range(0, max_jint) \
734 \
735 product(intx, MaxTrivialSize, 6, \
736 "The maximum bytecode size of a trivial method to be inlined by " \
737 "high tier compiler") \
738 range(0, max_jint) \
739 \
740 product(bool, IncrementalInline, true, \
741 "do post parse inlining") \
742 \
743 product(bool, IncrementalInlineMH, true, DIAGNOSTIC, \
744 "do post parse inlining of method handle calls") \
745 \
746 product(bool, IncrementalInlineVirtual, true, DIAGNOSTIC, \
747 "do post parse inlining of virtual calls") \
748 \
749 develop(bool, AlwaysIncrementalInline, false, \
750 "do all inlining incrementally") \
751 \
752 product(bool, IncrementalInlineForceCleanup, false, DIAGNOSTIC, \
753 "do cleanup after every iteration of incremental inlining") \
754 \
755 product(intx, LiveNodeCountInliningCutoff, 40000, \
756 "max number of live nodes in a method") \
757 range(0, max_juint / 8) \
758 \
759 product(bool, OptimizeExpensiveOps, true, DIAGNOSTIC, \
760 "Find best control for expensive operations") \
761 \
762 product(bool, UseMathExactIntrinsics, true, DIAGNOSTIC, \
763 "Enables intrinsification of various java.lang.Math functions") \
764 \
765 product(bool, UseCharacterCompareIntrinsics, false, DIAGNOSTIC, \
766 "Enables intrinsification of java.lang.Character functions") \
767 \
768 product(bool, UseMultiplyToLenIntrinsic, false, DIAGNOSTIC, \
769 "Enables intrinsification of BigInteger.multiplyToLen()") \
770 \
771 product(bool, UseSquareToLenIntrinsic, false, DIAGNOSTIC, \
772 "Enables intrinsification of BigInteger.squareToLen()") \
773 \
774 product(bool, UseMulAddIntrinsic, false, DIAGNOSTIC, \
775 "Enables intrinsification of BigInteger.mulAdd()") \
776 \
777 product(bool, UseMontgomeryMultiplyIntrinsic, false, DIAGNOSTIC, \
778 "Enables intrinsification of BigInteger.montgomeryMultiply()") \
779 \
780 product(bool, UseMontgomerySquareIntrinsic, false, DIAGNOSTIC, \
781 "Enables intrinsification of BigInteger.montgomerySquare()") \
782 \
783 product(bool, EnableVectorSupport, false, EXPERIMENTAL, \
784 "Enables VectorSupport intrinsics") \
785 \
786 product(bool, EnableVectorReboxing, false, EXPERIMENTAL, \
787 "Enables reboxing of vectors") \
788 \
789 product(bool, EnableVectorAggressiveReboxing, false, EXPERIMENTAL, \
790 "Enables aggressive reboxing of vectors") \
791 \
792 product(bool, UseTypeSpeculation, true, \
793 "Speculatively propagate types from profiles") \
794 \
795 product(bool, UseInlineDepthForSpeculativeTypes, true, DIAGNOSTIC, \
796 "Carry inline depth of profile point with speculative type " \
797 "and give priority to profiling from lower inline depth") \
798 \
799 product_pd(bool, TrapBasedRangeChecks, \
800 "Generate code for range checks that uses a cmp and trap " \
801 "instruction raising SIGTRAP. Used on PPC64.") \
802 \
803 product(intx, ArrayCopyLoadStoreMaxElem, 8, \
804 "Maximum number of arraycopy elements inlined as a sequence of" \
805 "loads/stores") \
806 range(0, max_intx) \
807 \
808 develop(bool, StressArrayCopyMacroNode, false, \
809 "Perform ArrayCopy load/store replacement during IGVN only") \
810 \
811 develop(bool, RenumberLiveNodes, true, \
812 "Renumber live nodes") \
813 \
814 product(uintx, LoopStripMiningIter, 0, \
815 "Number of iterations in strip mined loop") \
816 range(0, max_juint) \
817 constraint(LoopStripMiningIterConstraintFunc, AfterErgo) \
818 \
819 product(uintx, LoopStripMiningIterShortLoop, 0, \
820 "Loop with fewer iterations are not strip mined") \
821 range(0, max_juint) \
822 \
823 product(bool, UseProfiledLoopPredicate, true, \
824 "Move checks with an uncommon trap out of loops based on " \
825 "profiling data. " \
826 "Requires UseLoopPredicate to be turned on (default).") \
827 \
828 product(bool, UseArrayLoadStoreProfile, true, \
829 "Take advantage of profiling at array load/store") \
830 \
831 product(bool, UseACmpProfile, true, \
832 "Take advantage of profiling at acmp") \
833 \
834 develop(uintx, StressLongCountedLoop, 0, \
835 "if > 0, convert int counted loops to long counted loops" \
836 "to stress handling of long counted loops: run inner loop" \
837 "for at most jint_max / StressLongCountedLoop") \
838 range(0, max_juint) \
839 \
840 product(bool, DuplicateBackedge, true, DIAGNOSTIC, \
841 "Transform loop with a merge point into 2 loops if inner loop is" \
842 "expected to optimize better") \
843 \
844 develop(bool, StressDuplicateBackedge, false, \
845 "Run DuplicateBackedge whenever possible ignoring benefit" \
846 "analysis") \
847 \
848 product(bool, VerifyReceiverTypes, trueInDebug, DIAGNOSTIC, \
849 "Verify receiver types at runtime") \
850 \
851 product(intx, TypeProfileSubTypeCheckCommonThreshold, 50, \
852 "Use profile data at type check if profiled types account for" \
853 "more than this threshold") \
854 range(0, 100) \
855 \
856 develop(bool, StressPrunedExceptionHandlers, false, \
857 "Always prune exception handlers") \
858 \
859 product(bool, InlineSecondarySupersTest, true, DIAGNOSTIC, \
860 "Inline the secondary supers hash lookup.") \
861 \
862 product(bool, UseStoreStoreForCtor, true, DIAGNOSTIC, \
863 "Use StoreStore barrier instead of Release barrier at the end " \
864 "of constructors") \
865 \
866 develop(bool, KillPathsReachableByDeadTypeNode, true, \
867 "When a Type node becomes top, make paths where the node is " \
868 "used dead by replacing them with a Halt node. Turning this off " \
869 "could corrupt the graph in rare cases and should be used with " \
870 "care.") \
871 develop(ccstrlist, PrintInlineKlassFields, "", \
872 "Print fields collected by InlineKlass::collect_fields") \
873 \
874 develop(bool, StressLoopPeeling, false, \
875 "Randomize loop peeling decision") \
876
877 // end of C2_FLAGS
878
879 DECLARE_FLAGS(C2_FLAGS)
880
881 #endif // SHARE_OPTO_C2_GLOBALS_HPP