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 "runtime/globals_shared.hpp"
29 #include "utilities/macros.hpp"
30 #include CPU_HEADER(c2_globals)
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, StressMacroElimination, false, DIAGNOSTIC, \
62 "Randomize macro node elimination order") \
63 \
64 product(bool, StressUnstableIfTraps, false, DIAGNOSTIC, \
65 "Randomly take unstable if traps") \
66 \
67 product(uint, StressSeed, 0, DIAGNOSTIC, \
68 "Seed for randomized stress testing (if unset, a random one is " \
69 "generated). The seed is recorded in the compilation log, if " \
70 "available.") \
71 range(0, max_juint) \
72 \
73 develop(bool, StressMethodHandleLinkerInlining, false, \
74 "Stress inlining through method handle linkers") \
75 \
76 develop(bool, StressBailout, false, \
77 "Perform bailouts randomly at C2 failing() checks") \
78 \
79 develop(uint, StressBailoutMean, 100000, \
80 "The expected number of failing() checks made until " \
81 "a random bailout.") \
82 range(1, max_juint) \
83 \
84 develop(intx, OptoPrologueNops, 0, \
85 "Insert this many extra nop instructions " \
86 "in the prologue of every nmethod") \
87 range(0, 128) \
88 \
89 product_pd(intx, InteriorEntryAlignment, \
90 "Code alignment for interior entry points " \
91 "in generated code (in bytes)") \
92 constraint(InteriorEntryAlignmentConstraintFunc, AfterErgo) \
93 \
94 product(intx, MaxLoopPad, (OptoLoopAlignment-1), \
95 "Align a loop if padding size in bytes is less or equal to this " \
96 "value") \
97 range(0, max_jint) \
98 \
99 product(intx, MaxVectorSize, 64, \
100 "Max vector size in bytes, " \
101 "actual size could be less depending on elements type") \
102 range(0, max_jint) \
103 \
104 product(intx, ArrayOperationPartialInlineSize, 0, DIAGNOSTIC, \
105 "Partial inline size used for small array operations" \
106 "(e.g. copy,cmp) acceleration.") \
107 range(0, 256) \
108 \
109 product(bool, AlignVector, true, \
110 "Perform vector store/load alignment in loop") \
111 \
112 develop(bool, VerifyAlignVector, false, \
113 "Check that vector stores/loads are aligned if AlignVector" \
114 "is enabled.") \
115 \
116 product(intx, NumberOfLoopInstrToAlign, 4, \
117 "Number of first instructions in a loop to align") \
118 range(0, max_jint) \
119 \
120 develop(intx, IndexSetWatch, 0, \
121 "Trace all operations on this IndexSet (-1 means all, 0 none)") \
122 range(-1, max_intx) \
123 \
124 develop(intx, OptoNodeListSize, 4, \
125 "Starting allocation size of Node_List data structures") \
126 range(1, max_jint) \
127 \
128 develop(intx, OptoBlockListSize, 8, \
129 "Starting allocation size of Block_List data structures") \
130 range(1, max_jint) \
131 \
132 develop(intx, OptoPeepholeAt, -1, \
133 "Apply peephole optimizations to this peephole rule") \
134 \
135 develop(bool, PrintIdeal, false, \
136 "Print ideal graph before code generation") \
137 \
138 develop(bool, PrintOpto, false, \
139 "Print compiler2 attempts") \
140 \
141 develop(bool, PrintOptoInlining, false, \
142 "Print compiler2 inlining decisions") \
143 \
144 develop(bool, VerifyIdealNodeCount, false, \
145 "Verify that tracked dead ideal node count is accurate") \
146 \
147 develop(bool, PrintIdealNodeCount, false, \
148 "Print liveness counts of ideal nodes") \
149 \
150 product_pd(bool, IdealizeClearArrayNode, DIAGNOSTIC, \
151 "Replace ClearArrayNode by subgraph of basic operations.") \
152 \
153 develop(bool, OptoBreakpoint, false, \
154 "insert breakpoint at method entry") \
155 \
156 develop(bool, OptoBreakpointOSR, false, \
157 "insert breakpoint at osr method entry") \
158 \
159 develop(uint64_t, BreakAtNode, 0, \
160 "Break at construction of this Node (either _idx or _debug_idx)") \
161 \
162 develop(bool, OptoBreakpointC2R, false, \
163 "insert breakpoint at runtime stub entry") \
164 \
165 develop(bool, OptoNoExecute, false, \
166 "Attempt to parse and compile but do not execute generated code") \
167 \
168 develop(bool, PrintOptoStatistics, false, \
169 "Print New compiler statistics") \
170 \
171 product(bool, PrintOptoAssembly, false, DIAGNOSTIC, \
172 "Print New compiler assembly output") \
173 \
174 develop_pd(bool, OptoPeephole, \
175 "Apply peephole optimizations after register allocation") \
176 \
177 develop(bool, PrintFrameConverterAssembly, false, \
178 "Print New compiler assembly output for frame converters") \
179 \
180 develop(bool, PrintParseStatistics, false, \
181 "Print nodes, transforms and new values made per bytecode parsed")\
182 \
183 develop(bool, PrintOptoPeephole, false, \
184 "Print New compiler peephole replacements") \
185 \
186 develop(bool, PrintCFGBlockFreq, false, \
187 "Print CFG block frequencies") \
188 \
189 develop(bool, TraceOptoParse, false, \
190 "Trace bytecode parse and control-flow merge") \
191 \
192 product_pd(intx, LoopUnrollLimit, \
193 "Unroll loop bodies with node count less than this") \
194 range(0, max_jint / 4) \
195 \
196 product_pd(intx, LoopPercentProfileLimit, \
197 "Unroll loop bodies with % node count of profile limit") \
198 range(10, 100) \
199 \
200 product(intx, LoopMaxUnroll, 16, \
201 "Maximum number of unrolls for main loop") \
202 range(0, max_jint) \
203 \
204 product_pd(bool, SuperWordLoopUnrollAnalysis, \
205 "Map number of unrolls for main loop via " \
206 "Superword Level Parallelism analysis") \
207 \
208 develop(bool, TraceSuperWordLoopUnrollAnalysis, false, \
209 "Trace what Superword Level Parallelism analysis applies") \
210 \
211 product(bool, UseVectorMacroLogic, true, DIAGNOSTIC, \
212 "Use ternary macro logic instructions") \
213 \
214 product(intx, LoopUnrollMin, 4, \
215 "Minimum number of unroll loop bodies before checking progress" \
216 "of rounds of unroll,optimize,..") \
217 range(0, max_jint) \
218 \
219 product(bool, UseSubwordForMaxVector, true, \
220 "Use Subword Analysis to set maximum vector size") \
221 \
222 product(bool, UseVectorCmov, false, \
223 "Use Vectorized Cmov") \
224 \
225 develop(intx, UnrollLimitForProfileCheck, 1, \
226 "Don't use profile_trip_cnt() to restrict unrolling until " \
227 "unrolling would push the number of unrolled iterations above " \
228 "UnrollLimitForProfileCheck. A higher value allows more " \
229 "unrolling. Zero acts as a very large value." ) \
230 range(0, max_intx) \
231 \
232 product(intx, MultiArrayExpandLimit, 6, \
233 "Maximum number of individual allocations in an inline-expanded " \
234 "multianewarray instruction") \
235 range(0, max_jint) \
236 \
237 develop(bool, TraceProfileTripCount, false, \
238 "Trace profile loop trip count information") \
239 \
240 product(bool, UseCountedLoopSafepoints, false, \
241 "Force counted loops to keep a safepoint") \
242 \
243 product(bool, UseLoopPredicate, true, \
244 "Move checks with uncommon trap out of loops.") \
245 \
246 develop(bool, TraceLoopPredicate, false, \
247 "Trace generation of loop predicates") \
248 \
249 develop(bool, TraceLoopOpts, false, \
250 "Trace executed loop optimizations") \
251 \
252 develop(bool, TraceLoopLimitCheck, false, \
253 "Trace generation of loop limits checks") \
254 \
255 develop(bool, TraceRangeLimitCheck, false, \
256 "Trace additional overflow checks in RCE") \
257 \
258 /* OptimizeFill not yet supported on PowerPC. */ \
259 product(bool, OptimizeFill, true PPC64_ONLY(&& false), \
260 "convert fill/copy loops into intrinsic") \
261 \
262 develop(bool, TraceOptimizeFill, false, \
263 "print detailed information about fill conversion") \
264 \
265 develop(bool, OptoCoalesce, true, \
266 "Use Conservative Copy Coalescing in the Register Allocator") \
267 \
268 develop(bool, UseUniqueSubclasses, true, \
269 "Narrow an abstract reference to the unique concrete subclass") \
270 \
271 product(intx, TrackedInitializationLimit, 50, \
272 "When initializing fields, track up to this many words") \
273 range(0, 65535) \
274 \
275 product(bool, ReduceFieldZeroing, true, \
276 "When initializing fields, try to avoid needless zeroing") \
277 \
278 product(bool, ReduceInitialCardMarks, true, \
279 "When initializing fields, try to avoid needless card marks") \
280 \
281 product(bool, ReduceBulkZeroing, true, \
282 "When bulk-initializing, try to avoid needless zeroing") \
283 \
284 product(bool, UseFPUForSpilling, false, \
285 "Spill integer registers to FPU instead of stack when possible") \
286 \
287 develop_pd(intx, RegisterCostAreaRatio, \
288 "Spill selection in reg allocator: scale area by (X/64K) before " \
289 "adding cost") \
290 \
291 develop_pd(bool, UseCISCSpill, \
292 "Use ADLC supplied cisc instructions during allocation") \
293 \
294 develop(bool, VerifyGraphEdges , false, \
295 "Verify Bi-directional Edges") \
296 \
297 develop(bool, VerifyDUIterators, true, \
298 "Verify the safety of all iterations of Bi-directional Edges") \
299 \
300 develop(bool, VerifyHashTableKeys, true, \
301 "Verify the immutability of keys in the VN hash tables") \
302 \
303 develop(bool, VerifyRegisterAllocator , false, \
304 "Verify Register Allocator") \
305 \
306 develop(intx, FLOATPRESSURE, -1, \
307 "Number of float LRG's that constitute high register pressure." \
308 "-1: means the threshold is determined by number of available " \
309 "float register for allocation") \
310 range(-1, max_jint) \
311 \
312 develop(intx, INTPRESSURE, -1, \
313 "Number of integer LRG's that constitute high register pressure." \
314 "-1: means the threshold is determined by number of available " \
315 "integer register for allocation") \
316 range(-1, max_jint) \
317 \
318 develop(bool, TraceOptoPipelining, false, \
319 "Trace pipelining information") \
320 \
321 develop(bool, TraceOptoOutput, false, \
322 "Trace pipelining information") \
323 \
324 product_pd(bool, OptoScheduling, \
325 "Instruction Scheduling after register allocation") \
326 \
327 product_pd(bool, OptoRegScheduling, \
328 "Instruction Scheduling before register allocation for pressure") \
329 \
330 product(bool, PartialPeelLoop, true, \
331 "Partial peel (rotate) loops") \
332 \
333 product(intx, PartialPeelNewPhiDelta, 0, \
334 "Additional phis that can be created by partial peeling") \
335 range(0, max_jint) \
336 \
337 develop(bool, TracePartialPeeling, false, \
338 "Trace partial peeling (loop rotation) information") \
339 \
340 product(bool, PartialPeelAtUnsignedTests, true, \
341 "Partial peel at unsigned tests if no signed test exists") \
342 \
343 product(bool, ReassociateInvariants, true, \
344 "Enable reassociation of expressions with loop invariants.") \
345 \
346 product(bool, LoopUnswitching, true, \
347 "Enable loop unswitching (a form of invariant test hoisting)") \
348 \
349 develop(bool, TraceLoopUnswitching, false, \
350 "Trace loop unswitching") \
351 \
352 product(bool, LoopMultiversioning, true, DIAGNOSTIC, \
353 "Enable loop multiversioning (for speculative compilation)") \
354 \
355 develop(bool, TraceLoopMultiversioning, false, \
356 "Trace loop multiversioning") \
357 \
358 product(bool, AllowVectorizeOnDemand, true, \
359 "Globally suppress vectorization set in VectorizeMethod") \
360 \
361 product(bool, UseSuperWord, true, \
362 "Transform scalar operations into superword operations") \
363 \
364 product(bool, SuperWordReductions, true, \
365 "Enable reductions support in superword.") \
366 \
367 product_pd(uint, SuperWordStoreToLoadForwardingFailureDetection, DIAGNOSTIC, \
368 "if >0, auto-vectorization detects possible store-to-load " \
369 "forwarding failures. The number specifies over how many " \
370 "loop iterations this detection spans.") \
371 range(0, 4096) \
372 \
373 product(uint, SuperWordAutomaticAlignment, 1, DIAGNOSTIC, \
374 "0 = Disabled (unless AlignVector is enabled)" \
375 "Else: align with a load or store of the largest vector width," \
376 " and if there are loads and stores of the largest width:" \
377 "1 = Prefer alignment with vector store (default)" \
378 "2 = Prefer alignment with vector load.") \
379 range(0, 2) \
380 \
381 product(uint, AutoVectorizationOverrideProfitability, 1, DIAGNOSTIC, \
382 "Override the auto vectorization profitability heuristics." \
383 "0 = Run auto vectorizer, but abort just before applying" \
384 " vectorization, as though it was not profitable." \
385 "1 = Run auto vectorizer with the default profitability" \
386 " heuristics. This is the default, and hopefully" \
387 " delivers the best performance." \
388 "2 = Run auto vectorizer, and vectorize even if the" \
389 " profitability heuristics predict that vectorization" \
390 " is not profitable.") \
391 range(0, 2) \
392 \
393 product(bool, UseCMoveUnconditionally, false, \
394 "Use CMove (scalar and vector) ignoring profitability test.") \
395 \
396 develop(bool, TraceSuperWord, false, \
397 "Trace superword transforms") \
398 \
399 develop(bool, TraceNewVectors, false, \
400 "Trace creation of Vector nodes") \
401 \
402 product(bool, MergeStores, true, DIAGNOSTIC, \
403 "Optimize stores by combining values into larger store") \
404 \
405 product_pd(bool, OptoBundling, \
406 "Generate nops to fill i-cache lines") \
407 \
408 product_pd(intx, ConditionalMoveLimit, \
409 "Limit of ops to make speculative when using CMOVE") \
410 range(0, max_jint) \
411 \
412 develop(intx, PrintPhaseLevel, 0, \
413 "Level of detail of the phase trace print. " \
414 "System-wide value, -1=printing is disabled, " \
415 "0=print nothing except PhasePrintLevel directives, " \
416 "6=all details printed. " \
417 "Level of detail of printouts can be set on a per-method level " \
418 "as well by using CompileCommand=PrintPhaseLevel.") \
419 range(-1, 6) \
420 \
421 develop(bool, PrintIdealGraph, false, \
422 "Print ideal graph to XML file / network interface. " \
423 "By default attempts to connect to the visualizer on a socket.") \
424 \
425 develop(intx, PrintIdealGraphLevel, 0, \
426 "Level of detail of the ideal graph printout. " \
427 "System-wide value, -1=printing is disabled, " \
428 "0=print nothing except IGVPrintLevel directives, " \
429 "6=all details printed. " \
430 "Level of detail of printouts can be set on a per-method level " \
431 "as well by using CompileCommand=option.") \
432 range(-1, 6) \
433 \
434 develop(intx, PrintIdealGraphPort, 4444, \
435 "Ideal graph printer to network port") \
436 range(0, SHRT_MAX) \
437 \
438 develop(ccstr, PrintIdealGraphAddress, "127.0.0.1", \
439 "IP address to connect to visualizer") \
440 \
441 develop(ccstr, PrintIdealGraphFile, nullptr, \
442 "File to dump ideal graph to. If set overrides the " \
443 "use of the network") \
444 \
445 product(bool, UseBimorphicInlining, true, \
446 "Profiling based inlining for two receivers") \
447 \
448 product(bool, UseOnlyInlinedBimorphic, true, \
449 "Don't use BimorphicInlining if can't inline a second method") \
450 \
451 develop(bool, SubsumeLoads, true, \
452 "Attempt to compile while subsuming loads into machine " \
453 "instructions.") \
454 \
455 develop(bool, StressRecompilation, false, \
456 "Recompile each compiled method without subsuming loads " \
457 "or escape analysis.") \
458 \
459 develop(intx, ImplicitNullCheckThreshold, 3, \
460 "Don't do implicit null checks if NPE's in a method exceeds " \
461 "limit") \
462 range(0, max_jint) \
463 \
464 product(intx, LoopOptsCount, 43, \
465 "Set level of loop optimization for tier 1 compiles") \
466 range(5, max_jint) \
467 \
468 product(bool, OptimizeUnstableIf, true, DIAGNOSTIC, \
469 "Optimize UnstableIf traps") \
470 \
471 /* controls for heat-based inlining */ \
472 \
473 develop(intx, NodeCountInliningCutoff, 18000, \
474 "If parser node generation exceeds limit stop inlining") \
475 range(0, max_jint) \
476 \
477 product(intx, MaxNodeLimit, 80000, \
478 "Maximum number of nodes") \
479 range(1000, max_jint / 3) \
480 \
481 product(intx, NodeLimitFudgeFactor, 2000, \
482 "Fudge Factor for certain optimizations") \
483 constraint(NodeLimitFudgeFactorConstraintFunc, AfterErgo) \
484 \
485 product(bool, UseJumpTables, true, \
486 "Use JumpTables instead of a binary search tree for switches") \
487 \
488 product(bool, UseDivMod, true, \
489 "Use combined DivMod instruction if available") \
490 \
491 product_pd(intx, MinJumpTableSize, \
492 "Minimum number of targets in a generated jump table") \
493 range(0, max_intx) \
494 \
495 product(intx, MaxJumpTableSize, 65000, \
496 "Maximum number of targets in a generated jump table") \
497 range(0, max_intx) \
498 \
499 product(intx, MaxJumpTableSparseness, 5, \
500 "Maximum sparseness for jumptables") \
501 range(0, max_intx / 4) \
502 \
503 product(bool, EliminateLocks, true, \
504 "Coarsen locks when possible") \
505 \
506 product(bool, EliminateNestedLocks, true, \
507 "Eliminate nested locks of the same object when possible") \
508 \
509 develop(bool, PrintLockStatistics, false, \
510 "Print precise statistics on the dynamic lock usage") \
511 \
512 develop(bool, PrintEliminateLocks, false, \
513 "Print out when locks are eliminated") \
514 \
515 product(bool, EliminateAutoBox, true, \
516 "Control optimizations for autobox elimination") \
517 \
518 product(intx, AutoBoxCacheMax, 128, \
519 "Sets max value cached by the java.lang.Integer autobox cache") \
520 range(0, max_jint) \
521 \
522 product(bool, AggressiveUnboxing, true, DIAGNOSTIC, \
523 "Control optimizations for aggressive boxing elimination") \
524 \
525 develop(bool, TracePostallocExpand, false, "Trace expanding nodes after" \
526 " register allocation.") \
527 \
528 product(bool, ReduceAllocationMerges, true, DIAGNOSTIC, \
529 "Try to simplify allocation merges before Scalar Replacement") \
530 \
531 develop(bool, TraceReduceAllocationMerges, false, \
532 "Trace decision for simplifying allocation merges.") \
533 \
534 develop(bool, VerifyReduceAllocationMerges, true, \
535 "Verify reduce allocation merges in escape analysis") \
536 \
537 product(bool, DoEscapeAnalysis, true, \
538 "Perform escape analysis") \
539 \
540 product(double, EscapeAnalysisTimeout, 20. DEBUG_ONLY(+40.), \
541 "Abort EA when it reaches time limit (in sec)") \
542 range(0, DBL_MAX) \
543 \
544 develop(bool, ExitEscapeAnalysisOnTimeout, true, \
545 "Exit or throw assert in EA when it reaches time limit") \
546 \
547 develop(bool, PrintEscapeAnalysis, false, \
548 "Print the results of escape analysis") \
549 \
550 product(bool, EliminateAllocations, true, \
551 "Use escape analysis to eliminate allocations") \
552 \
553 develop(bool, PrintEliminateAllocations, false, \
554 "Print out when allocations are eliminated") \
555 \
556 product(intx, EliminateAllocationArraySizeLimit, 64, \
557 "Array size (number of elements) limit for scalar replacement") \
558 range(0, max_jint) \
559 \
560 product(intx, EliminateAllocationFieldsLimit, 512, DIAGNOSTIC, \
561 "Number of fields in instance limit for scalar replacement") \
562 range(0, max_jint) \
563 \
564 product(bool, OptimizePtrCompare, true, \
565 "Use escape analysis to optimize pointers compare") \
566 \
567 develop(bool, PrintOptimizePtrCompare, false, \
568 "Print information about optimized pointers compare") \
569 \
570 develop(bool, VerifyConnectionGraph , true, \
571 "Verify Connection Graph construction in Escape Analysis") \
572 \
573 product(bool, OptimizeStringConcat, true, \
574 "Optimize the construction of Strings by StringBuilder") \
575 \
576 develop(bool, PrintOptimizeStringConcat, false, \
577 "Print information about transformations performed on Strings") \
578 \
579 product(intx, ValueSearchLimit, 1000, \
580 "Recursion limit in PhaseMacroExpand::value_from_mem_phi") \
581 range(0, max_jint) \
582 \
583 product(intx, MaxLabelRootDepth, 1100, \
584 "Maximum times call Label_Root to prevent stack overflow") \
585 range(100, max_jint) \
586 \
587 product(intx, DominatorSearchLimit, 1000, DIAGNOSTIC, \
588 "Iterations limit in Node::dominates") \
589 range(0, max_jint) \
590 \
591 product(bool, BlockLayoutByFrequency, true, \
592 "Use edge frequencies to drive block ordering") \
593 \
594 product(intx, BlockLayoutMinDiamondPercentage, 20, \
595 "Minimum %% of a successor (predecessor) for which block " \
596 "layout a will allow a fork (join) in a single chain") \
597 range(0, 100) \
598 \
599 product(bool, BlockLayoutRotateLoops, true, \
600 "Allow back branches to be fall throughs in the block layout") \
601 \
602 product(bool, InlineReflectionGetCallerClass, true, DIAGNOSTIC, \
603 "inline sun.reflect.Reflection.getCallerClass(), known to be " \
604 "part of base library DLL") \
605 \
606 product(bool, InlineObjectCopy, true, DIAGNOSTIC, \
607 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
608 \
609 product(bool, SpecialStringCompareTo, true, DIAGNOSTIC, \
610 "special version of string compareTo") \
611 \
612 product(bool, SpecialStringIndexOf, true, DIAGNOSTIC, \
613 "special version of string indexOf") \
614 \
615 product(bool, SpecialStringEquals, true, DIAGNOSTIC, \
616 "special version of string equals") \
617 \
618 product(bool, SpecialArraysEquals, true, DIAGNOSTIC, \
619 "special version of Arrays.equals(char[],char[])") \
620 \
621 product(bool, SpecialEncodeISOArray, true, DIAGNOSTIC, \
622 "special version of ISO_8859_1$Encoder.encodeISOArray") \
623 \
624 develop(bool, BailoutToInterpreterForThrows, false, \
625 "Compiled methods which throws/catches exceptions will be " \
626 "deopt and intp.") \
627 \
628 develop(bool, ConvertCmpD2CmpF, true, \
629 "Convert cmpD to cmpF when one input is constant in float range") \
630 \
631 develop(bool, ConvertFloat2IntClipping, true, \
632 "Convert float2int clipping idiom to integer clipping") \
633 \
634 develop(bool, MonomorphicArrayCheck, true, \
635 "Uncommon-trap array store checks that require full type check") \
636 \
637 develop(bool, TracePhaseCCP, false, \
638 "Print progress during Conditional Constant Propagation") \
639 \
640 develop(bool, PrintDominators, false, \
641 "Print out dominator trees for GVN") \
642 \
643 product(bool, TraceSpilling, false, DIAGNOSTIC, \
644 "Trace spilling") \
645 \
646 product(bool, TraceTypeProfile, false, DIAGNOSTIC, \
647 "Trace type profile") \
648 \
649 develop(bool, PoisonOSREntry, true, \
650 "Detect abnormal calls to OSR code") \
651 \
652 develop(bool, SoftMatchFailure, trueInProduct, \
653 "If the DFA fails to match a node, print a message and bail out") \
654 \
655 develop(bool, InlineAccessors, true, \
656 "inline accessor methods (get/set)") \
657 \
658 product(intx, TypeProfileMajorReceiverPercent, 90, \
659 "% of major receiver type to all profiled receivers") \
660 range(0, 100) \
661 \
662 product(bool, PrintIntrinsics, false, DIAGNOSTIC, \
663 "prints attempted and successful inlining of intrinsics") \
664 \
665 develop(bool, StressReflectiveCode, false, \
666 "Use inexact types at allocations, etc., to test reflection") \
667 \
668 product(bool, DebugInlinedCalls, true, DIAGNOSTIC, \
669 "If false, restricts profiled locations to the root method only") \
670 \
671 develop(bool, VerifyLoopOptimizations, false, \
672 "verify major loop optimizations") \
673 \
674 develop(bool, VerifyNoNewIrreducibleLoops, false, \
675 "Verify that no new irreducible loops are created after parsing") \
676 \
677 product(bool, ProfileDynamicTypes, true, DIAGNOSTIC, \
678 "do extra type profiling and use it more aggressively") \
679 \
680 develop(bool, TraceIterativeGVN, false, \
681 "Print progress during Iterative Global Value Numbering") \
682 \
683 develop(uint, VerifyIterativeGVN, 0, \
684 "Verify Iterative Global Value Numbering =DCBA, with:" \
685 " D: verify Node::Identity did not miss opportunities" \
686 " C: verify Node::Ideal did not miss opportunities" \
687 " B: verify that type(n) == n->Value() after IGVN" \
688 " A: verify Def-Use modifications during IGVN" \
689 "Each can be 0=off or 1=on") \
690 constraint(VerifyIterativeGVNConstraintFunc, AtParse) \
691 \
692 develop(bool, TraceCISCSpill, false, \
693 "Trace allocators use of cisc spillable instructions") \
694 \
695 product(bool, SplitIfBlocks, true, \
696 "Clone compares and control flow through merge points to fold " \
697 "some branches") \
698 \
699 develop(intx, FreqCountInvocations, 1, \
700 "Scaling factor for branch frequencies (deprecated)") \
701 range(1, max_intx) \
702 \
703 develop(bool, VerifyAliases, false, \
704 "perform extra checks on the results of alias analysis") \
705 \
706 product(uint, VerifyConstraintCasts, 0, DIAGNOSTIC, \
707 "Perform runtime checks to verify the value of a " \
708 "ConstraintCast lies inside its type" \
709 "0 = does not perform any verification, " \
710 "1 = perform verification on ConstraintCastNodes that are " \
711 "present during code emission, " \
712 "2 = Do not do widening of ConstraintCastNodes so that we can " \
713 "have more verification coverage") \
714 range(0, 2) \
715 \
716 product(intx, MaxInlineLevel, 15, \
717 "maximum number of nested calls that are inlined by high tier " \
718 "compiler") \
719 range(0, max_jint) \
720 \
721 product(intx, MaxRecursiveInlineLevel, 1, \
722 "maximum number of nested recursive calls that are inlined by " \
723 "high tier compiler") \
724 range(0, max_jint) \
725 \
726 product_pd(intx, InlineSmallCode, \
727 "Only inline already compiled methods if their code size is " \
728 "less than this") \
729 range(0, max_jint) \
730 \
731 product(intx, MaxInlineSize, 35, \
732 "The maximum bytecode size of a method to be inlined by high " \
733 "tier compiler") \
734 range(0, max_jint) \
735 \
736 product_pd(intx, FreqInlineSize, \
737 "The maximum bytecode size of a frequent method to be inlined") \
738 range(0, max_jint) \
739 \
740 product(intx, MaxTrivialSize, 6, \
741 "The maximum bytecode size of a trivial method to be inlined by " \
742 "high tier compiler") \
743 range(0, max_jint) \
744 \
745 product(bool, IncrementalInline, true, \
746 "do post parse inlining") \
747 \
748 product(bool, IncrementalInlineMH, true, DIAGNOSTIC, \
749 "do post parse inlining of method handle calls") \
750 \
751 product(bool, IncrementalInlineVirtual, true, DIAGNOSTIC, \
752 "do post parse inlining of virtual calls") \
753 \
754 develop(bool, AlwaysIncrementalInline, false, \
755 "do all inlining incrementally") \
756 \
757 product(bool, IncrementalInlineForceCleanup, false, DIAGNOSTIC, \
758 "do cleanup after every iteration of incremental inlining") \
759 \
760 product(intx, LiveNodeCountInliningCutoff, 40000, \
761 "max number of live nodes in a method") \
762 range(0, max_juint / 8) \
763 \
764 product(bool, OptimizeExpensiveOps, true, DIAGNOSTIC, \
765 "Find best control for expensive operations") \
766 \
767 product(bool, UseMathExactIntrinsics, true, DIAGNOSTIC, \
768 "Enables intrinsification of various java.lang.Math functions") \
769 \
770 product(bool, UseCharacterCompareIntrinsics, false, DIAGNOSTIC, \
771 "Enables intrinsification of java.lang.Character functions") \
772 \
773 product(bool, UseMultiplyToLenIntrinsic, false, DIAGNOSTIC, \
774 "Enables intrinsification of BigInteger.multiplyToLen()") \
775 \
776 product(bool, UseSquareToLenIntrinsic, false, DIAGNOSTIC, \
777 "Enables intrinsification of BigInteger.squareToLen()") \
778 \
779 product(bool, UseMulAddIntrinsic, false, DIAGNOSTIC, \
780 "Enables intrinsification of BigInteger.mulAdd()") \
781 \
782 product(bool, UseMontgomeryMultiplyIntrinsic, false, DIAGNOSTIC, \
783 "Enables intrinsification of BigInteger.montgomeryMultiply()") \
784 \
785 product(bool, UseMontgomerySquareIntrinsic, false, DIAGNOSTIC, \
786 "Enables intrinsification of BigInteger.montgomerySquare()") \
787 \
788 product(bool, EnableVectorSupport, false, EXPERIMENTAL, \
789 "Enables VectorSupport intrinsics") \
790 \
791 product(bool, EnableVectorReboxing, false, EXPERIMENTAL, \
792 "Enables reboxing of vectors") \
793 \
794 product(bool, EnableVectorAggressiveReboxing, false, EXPERIMENTAL, \
795 "Enables aggressive reboxing of vectors") \
796 \
797 product(bool, UseTypeSpeculation, true, \
798 "Speculatively propagate types from profiles") \
799 \
800 product(bool, UseInlineDepthForSpeculativeTypes, true, DIAGNOSTIC, \
801 "Carry inline depth of profile point with speculative type " \
802 "and give priority to profiling from lower inline depth") \
803 \
804 product_pd(bool, TrapBasedRangeChecks, \
805 "Generate code for range checks that uses a cmp and trap " \
806 "instruction raising SIGTRAP. Used on PPC64.") \
807 \
808 product(intx, ArrayCopyLoadStoreMaxElem, 8, \
809 "Maximum number of arraycopy elements inlined as a sequence of" \
810 "loads/stores") \
811 range(0, max_intx) \
812 \
813 develop(bool, StressArrayCopyMacroNode, false, \
814 "Perform ArrayCopy load/store replacement during IGVN only") \
815 \
816 develop(bool, RenumberLiveNodes, true, \
817 "Renumber live nodes") \
818 \
819 product(uintx, LoopStripMiningIter, 0, \
820 "Number of iterations in strip mined loop") \
821 range(0, max_juint) \
822 constraint(LoopStripMiningIterConstraintFunc, AfterErgo) \
823 \
824 product(uintx, LoopStripMiningIterShortLoop, 0, \
825 "Loop with fewer iterations are not strip mined") \
826 range(0, max_juint) \
827 \
828 product(bool, UseProfiledLoopPredicate, true, \
829 "Move checks with an uncommon trap out of loops based on " \
830 "profiling data. " \
831 "Requires UseLoopPredicate to be turned on (default).") \
832 \
833 develop(uintx, StressLongCountedLoop, 0, \
834 "if > 0, convert int counted loops to long counted loops" \
835 "to stress handling of long counted loops: run inner loop" \
836 "for at most jint_max / StressLongCountedLoop") \
837 range(0, max_juint) \
838 \
839 product(bool, DuplicateBackedge, true, DIAGNOSTIC, \
840 "Transform loop with a merge point into 2 loops if inner loop is" \
841 "expected to optimize better") \
842 \
843 develop(bool, StressDuplicateBackedge, false, \
844 "Run DuplicateBackedge whenever possible ignoring benefit" \
845 "analysis") \
846 \
847 product(bool, VerifyReceiverTypes, trueInDebug, DIAGNOSTIC, \
848 "Verify receiver types at runtime") \
849 \
850 product(intx, TypeProfileSubTypeCheckCommonThreshold, 50, \
851 "Use profile data at type check if profiled types account for" \
852 "more than this threshold") \
853 range(0, 100) \
854 \
855 develop(bool, StressPrunedExceptionHandlers, false, \
856 "Always prune exception handlers") \
857 \
858 product(bool, InlineSecondarySupersTest, true, DIAGNOSTIC, \
859 "Inline the secondary supers hash lookup.") \
860 \
861 product(bool, UseStoreStoreForCtor, true, DIAGNOSTIC, \
862 "Use StoreStore barrier instead of Release barrier at the end " \
863 "of constructors") \
864 \
865 develop(bool, KillPathsReachableByDeadTypeNode, true, \
866 "When a Type node becomes top, make paths where the node is " \
867 "used dead by replacing them with a Halt node. Turning this off " \
868 "could corrupt the graph in rare cases and should be used with " \
869 "care.") \
870 \
871 develop(bool, StressLoopPeeling, false, \
872 "Randomize loop peeling decision") \
873
874 // end of C2_FLAGS
875
876 DECLARE_FLAGS(C2_FLAGS)
877
878 #endif // SHARE_OPTO_C2_GLOBALS_HPP