1 /*
  2  * Copyright (c) 2000, 2023, 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
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 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                  notproduct,                                                \
 41                  range,                                                     \
 42                  constraint)                                                \
 43                                                                             \
 44   product(bool, StressLCM, false, DIAGNOSTIC,                               \
 45           "Randomize instruction scheduling in LCM")                        \
 46                                                                             \
 47   product(bool, StressGCM, false, DIAGNOSTIC,                               \
 48           "Randomize instruction scheduling in GCM")                        \
 49                                                                             \
 50   product(bool, StressIGVN, false, DIAGNOSTIC,                              \
 51           "Randomize worklist traversal in IGVN")                           \
 52                                                                             \
 53   product(bool, StressCCP, false, DIAGNOSTIC,                               \
 54           "Randomize worklist traversal in CCP")                            \
 55                                                                             \
 56   product(bool, StressIncrementalInlining, false, DIAGNOSTIC,               \
 57           "Randomize the incremental inlining decision")                    \
 58                                                                             \
 59   product(uint, StressSeed, 0, DIAGNOSTIC,                                  \
 60           "Seed for randomized stress testing (if unset, a random one is "  \
 61           "generated). The seed is recorded in the compilation log, if "    \
 62           "available.")                                                     \
 63           range(0, max_juint)                                               \
 64                                                                             \
 65   develop(bool, StressMethodHandleLinkerInlining, false,                    \
 66           "Stress inlining through method handle linkers")                  \
 67                                                                             \
 68   develop(intx, OptoPrologueNops, 0,                                        \
 69           "Insert this many extra nop instructions "                        \
 70           "in the prologue of every nmethod")                               \
 71           range(0, 128)                                                     \
 72                                                                             \
 73   product_pd(intx, InteriorEntryAlignment,                                  \
 74           "Code alignment for interior entry points "                       \
 75           "in generated code (in bytes)")                                   \
 76           constraint(InteriorEntryAlignmentConstraintFunc, AfterErgo)       \
 77                                                                             \
 78   product(intx, MaxLoopPad, (OptoLoopAlignment-1),                          \
 79           "Align a loop if padding size in bytes is less or equal to this " \
 80           "value")                                                          \
 81           range(0, max_jint)                                                \
 82                                                                             \
 83   product(intx, MaxVectorSize, 64,                                          \
 84           "Max vector size in bytes, "                                      \
 85           "actual size could be less depending on elements type")           \
 86           range(0, max_jint)                                                \
 87                                                                             \
 88   product(intx, ArrayOperationPartialInlineSize, 0, DIAGNOSTIC,             \
 89           "Partial inline size used for small array operations"             \
 90           "(e.g. copy,cmp) acceleration.")                                  \
 91           range(0, 256)                                                     \
 92                                                                             \
 93   product(bool, AlignVector, true,                                          \
 94           "Perform vector store/load alignment in loop")                    \
 95                                                                             \
 96   product(intx, NumberOfLoopInstrToAlign, 4,                                \
 97           "Number of first instructions in a loop to align")                \
 98           range(0, max_jint)                                                \
 99                                                                             \
100   notproduct(intx, IndexSetWatch, 0,                                        \
101           "Trace all operations on this IndexSet (-1 means all, 0 none)")   \
102           range(-1, max_intx)                                               \
103                                                                             \
104   develop(intx, OptoNodeListSize, 4,                                        \
105           "Starting allocation size of Node_List data structures")          \
106           range(1, max_jint)                                                \
107                                                                             \
108   develop(intx, OptoBlockListSize, 8,                                       \
109           "Starting allocation size of Block_List data structures")         \
110           range(1, max_jint)                                                \
111                                                                             \
112   develop(intx, OptoPeepholeAt, -1,                                         \
113           "Apply peephole optimizations to this peephole rule")             \
114                                                                             \
115   notproduct(bool, PrintIdeal, false,                                       \
116           "Print ideal graph before code generation")                       \
117                                                                             \
118   notproduct(bool, PrintOpto, false,                                        \
119           "Print compiler2 attempts")                                       \
120                                                                             \
121   notproduct(bool, PrintOptoInlining, false,                                \
122           "Print compiler2 inlining decisions")                             \
123                                                                             \
124   notproduct(bool, VerifyIdealNodeCount, false,                             \
125           "Verify that tracked dead ideal node count is accurate")          \
126                                                                             \
127   notproduct(bool, PrintIdealNodeCount, false,                              \
128           "Print liveness counts of ideal nodes")                           \
129                                                                             \
130   product_pd(bool, IdealizeClearArrayNode, DIAGNOSTIC,                      \
131           "Replace ClearArrayNode by subgraph of basic operations.")        \
132                                                                             \
133   develop(bool, OptoBreakpoint, false,                                      \
134           "insert breakpoint at method entry")                              \
135                                                                             \
136   notproduct(bool, OptoBreakpointOSR, false,                                \
137           "insert breakpoint at osr method entry")                          \
138                                                                             \
139   notproduct(uint64_t, BreakAtNode, 0,                                      \
140           "Break at construction of this Node (either _idx or _debug_idx)") \
141                                                                             \
142   notproduct(bool, OptoBreakpointC2R, false,                                \
143           "insert breakpoint at runtime stub entry")                        \
144                                                                             \
145   notproduct(bool, OptoNoExecute, false,                                    \
146           "Attempt to parse and compile but do not execute generated code") \
147                                                                             \
148   notproduct(bool, PrintOptoStatistics, false,                              \
149           "Print New compiler statistics")                                  \
150                                                                             \
151   product(bool, PrintOptoAssembly, false, DIAGNOSTIC,                       \
152           "Print New compiler assembly output")                             \
153                                                                             \
154   develop_pd(bool, OptoPeephole,                                            \
155           "Apply peephole optimizations after register allocation")         \
156                                                                             \
157   notproduct(bool, PrintFrameConverterAssembly, false,                      \
158           "Print New compiler assembly output for frame converters")        \
159                                                                             \
160   notproduct(bool, PrintParseStatistics, false,                             \
161           "Print nodes, transforms and new values made per bytecode parsed")\
162                                                                             \
163   notproduct(bool, PrintOptoPeephole, false,                                \
164           "Print New compiler peephole replacements")                       \
165                                                                             \
166   develop(bool, PrintCFGBlockFreq, false,                                   \
167           "Print CFG block frequencies")                                    \
168                                                                             \
169   develop(bool, TraceOptoParse, false,                                      \
170           "Trace bytecode parse and control-flow merge")                    \
171                                                                             \
172   product_pd(intx,  LoopUnrollLimit,                                        \
173           "Unroll loop bodies with node count less than this")              \
174           range(0, max_jint / 4)                                            \
175                                                                             \
176   product_pd(intx, LoopPercentProfileLimit,                                 \
177              "Unroll loop bodies with % node count of profile limit")       \
178              range(10, 100)                                                 \
179                                                                             \
180   product(intx,  LoopMaxUnroll, 16,                                         \
181           "Maximum number of unrolls for main loop")                        \
182           range(0, max_jint)                                                \
183                                                                             \
184   product_pd(bool,  SuperWordLoopUnrollAnalysis,                            \
185            "Map number of unrolls for main loop via "                       \
186            "Superword Level Parallelism analysis")                          \
187                                                                             \
188   notproduct(bool, TraceSuperWordLoopUnrollAnalysis, false,                 \
189           "Trace what Superword Level Parallelism analysis applies")        \
190                                                                             \
191   product(bool, UseVectorMacroLogic, true, DIAGNOSTIC,                      \
192           "Use ternary macro logic instructions")                           \
193                                                                             \
194   product(intx,  LoopUnrollMin, 4,                                          \
195           "Minimum number of unroll loop bodies before checking progress"   \
196           "of rounds of unroll,optimize,..")                                \
197           range(0, max_jint)                                                \
198                                                                             \
199   product(bool, UseSubwordForMaxVector, true,                               \
200           "Use Subword Analysis to set maximum vector size")                \
201                                                                             \
202   product(bool, UseVectorCmov, false,                                       \
203           "Use Vectorized Cmov")                                            \
204                                                                             \
205   develop(intx, UnrollLimitForProfileCheck, 1,                              \
206           "Don't use profile_trip_cnt() to restrict unrolling until "       \
207           "unrolling would push the number of unrolled iterations above "   \
208           "UnrollLimitForProfileCheck. A higher value allows more "         \
209           "unrolling. Zero acts as a very large value." )                   \
210           range(0, max_intx)                                                \
211                                                                             \
212   product(intx, MultiArrayExpandLimit, 6,                                   \
213           "Maximum number of individual allocations in an inline-expanded " \
214           "multianewarray instruction")                                     \
215           range(0, max_jint)                                                \
216                                                                             \
217   notproduct(bool, TraceProfileTripCount, false,                            \
218           "Trace profile loop trip count information")                      \
219                                                                             \
220   product(bool, UseCountedLoopSafepoints, false,                            \
221           "Force counted loops to keep a safepoint")                        \
222                                                                             \
223   product(bool, UseLoopPredicate, true,                                     \
224           "Generate a predicate to select fast/slow loop versions")         \
225                                                                             \
226   develop(bool, TraceLoopPredicate, false,                                  \
227           "Trace generation of loop predicates")                            \
228                                                                             \
229   develop(bool, TraceLoopOpts, false,                                       \
230           "Trace executed loop optimizations")                              \
231                                                                             \
232   develop(bool, TraceLoopLimitCheck, false,                                 \
233           "Trace generation of loop limits checks")                         \
234                                                                             \
235   develop(bool, TraceRangeLimitCheck, false,                                \
236           "Trace additional overflow checks in RCE")                        \
237                                                                             \
238   /* OptimizeFill not yet supported on PowerPC. */                          \
239   product(bool, OptimizeFill, true PPC64_ONLY(&& false),                    \
240           "convert fill/copy loops into intrinsic")                         \
241                                                                             \
242   develop(bool, TraceOptimizeFill, false,                                   \
243           "print detailed information about fill conversion")               \
244                                                                             \
245   develop(bool, OptoCoalesce, true,                                         \
246           "Use Conservative Copy Coalescing in the Register Allocator")     \
247                                                                             \
248   develop(bool, UseUniqueSubclasses, true,                                  \
249           "Narrow an abstract reference to the unique concrete subclass")   \
250                                                                             \
251   product(intx, TrackedInitializationLimit, 50,                             \
252           "When initializing fields, track up to this many words")          \
253           range(0, 65535)                                                   \
254                                                                             \
255   product(bool, ReduceFieldZeroing, true,                                   \
256           "When initializing fields, try to avoid needless zeroing")        \
257                                                                             \
258   product(bool, ReduceInitialCardMarks, true,                               \
259           "When initializing fields, try to avoid needless card marks")     \
260                                                                             \
261   product(bool, ReduceBulkZeroing, true,                                    \
262           "When bulk-initializing, try to avoid needless zeroing")          \
263                                                                             \
264   product(bool, UseFPUForSpilling, false,                                   \
265           "Spill integer registers to FPU instead of stack when possible")  \
266                                                                             \
267   develop_pd(intx, RegisterCostAreaRatio,                                   \
268           "Spill selection in reg allocator: scale area by (X/64K) before " \
269           "adding cost")                                                    \
270                                                                             \
271   develop_pd(bool, UseCISCSpill,                                            \
272           "Use ADLC supplied cisc instructions during allocation")          \
273                                                                             \
274   notproduct(bool, VerifyGraphEdges , false,                                \
275           "Verify Bi-directional Edges")                                    \
276                                                                             \
277   notproduct(bool, VerifyDUIterators, true,                                 \
278           "Verify the safety of all iterations of Bi-directional Edges")    \
279                                                                             \
280   notproduct(bool, VerifyHashTableKeys, true,                               \
281           "Verify the immutability of keys in the VN hash tables")          \
282                                                                             \
283   notproduct(bool, VerifyRegisterAllocator , false,                         \
284           "Verify Register Allocator")                                      \
285                                                                             \
286   develop(intx, FLOATPRESSURE, -1,                                          \
287           "Number of float LRG's that constitute high register pressure."   \
288           "-1: means the threshold is determined by number of available "   \
289           "float register for allocation")                                  \
290           range(-1, max_jint)                                               \
291                                                                             \
292   develop(intx, INTPRESSURE, -1,                                            \
293           "Number of integer LRG's that constitute high register pressure." \
294           "-1: means the threshold is determined by number of available "   \
295           "integer register for allocation")                                \
296           range(-1, max_jint)                                               \
297                                                                             \
298   notproduct(bool, TraceOptoPipelining, false,                              \
299           "Trace pipelining information")                                   \
300                                                                             \
301   notproduct(bool, TraceOptoOutput, false,                                  \
302           "Trace pipelining information")                                   \
303                                                                             \
304   product_pd(bool, OptoScheduling,                                          \
305           "Instruction Scheduling after register allocation")               \
306                                                                             \
307   product_pd(bool, OptoRegScheduling,                                       \
308           "Instruction Scheduling before register allocation for pressure") \
309                                                                             \
310   product(bool, PartialPeelLoop, true,                                      \
311           "Partial peel (rotate) loops")                                    \
312                                                                             \
313   product(intx, PartialPeelNewPhiDelta, 0,                                  \
314           "Additional phis that can be created by partial peeling")         \
315           range(0, max_jint)                                                \
316                                                                             \
317   notproduct(bool, TracePartialPeeling, false,                              \
318           "Trace partial peeling (loop rotation) information")              \
319                                                                             \
320   product(bool, PartialPeelAtUnsignedTests, true,                           \
321           "Partial peel at unsigned tests if no signed test exists")        \
322                                                                             \
323   product(bool, ReassociateInvariants, true,                                \
324           "Enable reassociation of expressions with loop invariants.")      \
325                                                                             \
326   product(bool, LoopUnswitching, true,                                      \
327           "Enable loop unswitching (a form of invariant test hoisting)")    \
328                                                                             \
329   notproduct(bool, TraceLoopUnswitching, false,                             \
330           "Trace loop unswitching")                                         \
331                                                                             \
332   product(bool, AllowVectorizeOnDemand, true,                               \
333           "Globally suppress vectorization set in VectorizeMethod")         \
334                                                                             \
335   product(bool, UseSuperWord, true,                                         \
336           "Transform scalar operations into superword operations")          \
337                                                                             \
338   develop(bool, SuperWordRTDepCheck, false,                                 \
339           "Enable runtime dependency checks.")                              \
340                                                                             \
341   product(bool, SuperWordReductions, true,                                  \
342           "Enable reductions support in superword.")                        \
343                                                                             \
344   product(bool, UseCMoveUnconditionally, false,                             \
345           "Use CMove (scalar and vector) ignoring profitability test.")     \
346                                                                             \
347   notproduct(bool, TraceSuperWord, false,                                   \
348           "Trace superword transforms")                                     \
349                                                                             \
350   notproduct(bool, TraceNewVectors, false,                                  \
351           "Trace creation of Vector nodes")                                 \
352                                                                             \
353   product_pd(bool, OptoBundling,                                            \
354           "Generate nops to fill i-cache lines")                            \
355                                                                             \
356   product_pd(intx, ConditionalMoveLimit,                                    \
357           "Limit of ops to make speculative when using CMOVE")              \
358           range(0, max_jint)                                                \
359                                                                             \
360   notproduct(bool, PrintIdealGraph, false,                                  \
361           "Print ideal graph to XML file / network interface. "             \
362           "By default attempts to connect to the visualizer on a socket.")  \
363                                                                             \
364   notproduct(intx, PrintIdealGraphLevel, 0,                                 \
365           "Level of detail of the ideal graph printout. "                   \
366           "System-wide value, -1=printing is disabled, "                    \
367           "0=print nothing except IGVPrintLevel directives, "               \
368           "5=all details printed. "                                         \
369           "Level of detail of printouts can be set on a per-method level "  \
370           "as well by using CompileCommand=option.")                        \
371           range(-1, 5)                                                      \
372                                                                             \
373   notproduct(intx, PrintIdealGraphPort, 4444,                               \
374           "Ideal graph printer to network port")                            \
375           range(0, SHRT_MAX)                                                \
376                                                                             \
377   notproduct(ccstr, PrintIdealGraphAddress, "127.0.0.1",                    \
378           "IP address to connect to visualizer")                            \
379                                                                             \
380   notproduct(ccstr, PrintIdealGraphFile, nullptr,                           \
381           "File to dump ideal graph to.  If set overrides the "             \
382           "use of the network")                                             \
383                                                                             \
384   product(bool, UseBimorphicInlining, true,                                 \
385           "Profiling based inlining for two receivers")                     \
386                                                                             \
387   product(bool, UseOnlyInlinedBimorphic, true,                              \
388           "Don't use BimorphicInlining if can't inline a second method")    \
389                                                                             \
390   develop(bool, SubsumeLoads, true,                                         \
391           "Attempt to compile while subsuming loads into machine "          \
392           "instructions.")                                                  \
393                                                                             \
394   develop(bool, StressRecompilation, false,                                 \
395           "Recompile each compiled method without subsuming loads "         \
396           "or escape analysis.")                                            \
397                                                                             \
398   develop(intx, ImplicitNullCheckThreshold, 3,                              \
399           "Don't do implicit null checks if NPE's in a method exceeds "     \
400           "limit")                                                          \
401           range(0, max_jint)                                                \
402                                                                             \
403   product(intx, LoopOptsCount, 43,                                          \
404           "Set level of loop optimization for tier 1 compiles")             \
405           range(5, 43)                                                      \
406                                                                             \
407   product(bool, OptimizeUnstableIf, true, DIAGNOSTIC,                       \
408           "Optimize UnstableIf traps")                                      \
409                                                                             \
410   /* controls for heat-based inlining */                                    \
411                                                                             \
412   develop(intx, NodeCountInliningCutoff, 18000,                             \
413           "If parser node generation exceeds limit stop inlining")          \
414           range(0, max_jint)                                                \
415                                                                             \
416   product(intx, MaxNodeLimit, 80000,                                        \
417           "Maximum number of nodes")                                        \
418           range(1000, max_jint / 3)                                         \
419                                                                             \
420   product(intx, NodeLimitFudgeFactor, 2000,                                 \
421           "Fudge Factor for certain optimizations")                         \
422           constraint(NodeLimitFudgeFactorConstraintFunc, AfterErgo)         \
423                                                                             \
424   product(bool, UseJumpTables, true,                                        \
425           "Use JumpTables instead of a binary search tree for switches")    \
426                                                                             \
427   product(bool, UseDivMod, true,                                            \
428           "Use combined DivMod instruction if available")                   \
429                                                                             \
430   product_pd(intx, MinJumpTableSize,                                        \
431           "Minimum number of targets in a generated jump table")            \
432           range(0, max_intx)                                                \
433                                                                             \
434   product(intx, MaxJumpTableSize, 65000,                                    \
435           "Maximum number of targets in a generated jump table")            \
436           range(0, max_intx)                                                \
437                                                                             \
438   product(intx, MaxJumpTableSparseness, 5,                                  \
439           "Maximum sparseness for jumptables")                              \
440           range(0, max_intx / 4)                                            \
441                                                                             \
442   product(bool, EliminateLocks, true,                                       \
443           "Coarsen locks when possible")                                    \
444                                                                             \
445   product(bool, EliminateNestedLocks, true,                                 \
446           "Eliminate nested locks of the same object when possible")        \
447                                                                             \
448   notproduct(bool, PrintLockStatistics, false,                              \
449           "Print precise statistics on the dynamic lock usage")             \
450                                                                             \
451   product(bool, PrintPreciseRTMLockingStatistics, false, DIAGNOSTIC,        \
452           "Print per-lock-site statistics of rtm locking in JVM")           \
453                                                                             \
454   notproduct(bool, PrintEliminateLocks, false,                              \
455           "Print out when locks are eliminated")                            \
456                                                                             \
457   product(bool, EliminateAutoBox, true,                                     \
458           "Control optimizations for autobox elimination")                  \
459                                                                             \
460   product(intx, AutoBoxCacheMax, 128,                                       \
461           "Sets max value cached by the java.lang.Integer autobox cache")   \
462           range(0, max_jint)                                                \
463                                                                             \
464   product(bool, AggressiveUnboxing, true, DIAGNOSTIC,                       \
465           "Control optimizations for aggressive boxing elimination")        \
466                                                                             \
467   develop(bool, TracePostallocExpand, false, "Trace expanding nodes after"  \
468           " register allocation.")                                          \
469                                                                             \
470   product(bool, ReduceAllocationMerges, true, DIAGNOSTIC,                   \
471           "Try to simplify allocation merges before Scalar Replacement")    \
472                                                                             \
473   notproduct(bool, TraceReduceAllocationMerges, false,                      \
474              "Trace decision for simplifying allocation merges.")           \
475                                                                             \
476   develop(bool, VerifyReduceAllocationMerges, true,                         \
477           "Verify reduce allocation merges in escape analysis")             \
478                                                                             \
479   product(bool, DoEscapeAnalysis, true,                                     \
480           "Perform escape analysis")                                        \
481                                                                             \
482   product(double, EscapeAnalysisTimeout, 20. DEBUG_ONLY(+40.),              \
483           "Abort EA when it reaches time limit (in sec)")                   \
484           range(0, DBL_MAX)                                                 \
485                                                                             \
486   develop(bool, ExitEscapeAnalysisOnTimeout, true,                          \
487           "Exit or throw assert in EA when it reaches time limit")          \
488                                                                             \
489   notproduct(bool, PrintEscapeAnalysis, false,                              \
490           "Print the results of escape analysis")                           \
491                                                                             \
492   product(bool, EliminateAllocations, true,                                 \
493           "Use escape analysis to eliminate allocations")                   \
494                                                                             \
495   notproduct(bool, PrintEliminateAllocations, false,                        \
496           "Print out when allocations are eliminated")                      \
497                                                                             \
498   product(intx, EliminateAllocationArraySizeLimit, 64,                      \
499           "Array size (number of elements) limit for scalar replacement")   \
500           range(0, max_jint)                                                \
501                                                                             \
502   product(intx, EliminateAllocationFieldsLimit, 512, DIAGNOSTIC,            \
503           "Number of fields in instance limit for scalar replacement")      \
504           range(0, max_jint)                                                \
505                                                                             \
506   product(bool, OptimizePtrCompare, true,                                   \
507           "Use escape analysis to optimize pointers compare")               \
508                                                                             \
509   notproduct(bool, PrintOptimizePtrCompare, false,                          \
510           "Print information about optimized pointers compare")             \
511                                                                             \
512   notproduct(bool, VerifyConnectionGraph , true,                            \
513           "Verify Connection Graph construction in Escape Analysis")        \
514                                                                             \
515   product(bool, OptimizeStringConcat, true,                                 \
516           "Optimize the construction of Strings by StringBuilder")          \
517                                                                             \
518   notproduct(bool, PrintOptimizeStringConcat, false,                        \
519           "Print information about transformations performed on Strings")   \
520                                                                             \
521   product(intx, ValueSearchLimit, 1000,                                     \
522           "Recursion limit in PhaseMacroExpand::value_from_mem_phi")        \
523           range(0, max_jint)                                                \
524                                                                             \
525   product(intx, MaxLabelRootDepth, 1100,                                    \
526           "Maximum times call Label_Root to prevent stack overflow")        \
527           range(100, max_jint)                                              \
528                                                                             \
529   product(intx, DominatorSearchLimit, 1000, DIAGNOSTIC,                     \
530           "Iterations limit in Node::dominates")                            \
531           range(0, max_jint)                                                \
532                                                                             \
533   product(bool, BlockLayoutByFrequency, true,                               \
534           "Use edge frequencies to drive block ordering")                   \
535                                                                             \
536   product(intx, BlockLayoutMinDiamondPercentage, 20,                        \
537           "Minimum %% of a successor (predecessor) for which block "        \
538           "layout a will allow a fork (join) in a single chain")            \
539           range(0, 100)                                                     \
540                                                                             \
541   product(bool, BlockLayoutRotateLoops, true,                               \
542           "Allow back branches to be fall throughs in the block layout")    \
543                                                                             \
544   product(bool, InlineReflectionGetCallerClass, true, DIAGNOSTIC,           \
545           "inline sun.reflect.Reflection.getCallerClass(), known to be "    \
546           "part of base library DLL")                                       \
547                                                                             \
548   product(bool, InlineObjectCopy, true, DIAGNOSTIC,                         \
549           "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
550                                                                             \
551   product(bool, SpecialStringCompareTo, true, DIAGNOSTIC,                   \
552           "special version of string compareTo")                            \
553                                                                             \
554   product(bool, SpecialStringIndexOf, true, DIAGNOSTIC,                     \
555           "special version of string indexOf")                              \
556                                                                             \
557   product(bool, SpecialStringEquals, true, DIAGNOSTIC,                      \
558           "special version of string equals")                               \
559                                                                             \
560   product(bool, SpecialArraysEquals, true, DIAGNOSTIC,                      \
561           "special version of Arrays.equals(char[],char[])")                \
562                                                                             \
563   product(bool, SpecialEncodeISOArray, true, DIAGNOSTIC,                    \
564           "special version of ISO_8859_1$Encoder.encodeISOArray")           \
565                                                                             \
566   develop(bool, BailoutToInterpreterForThrows, false,                       \
567           "Compiled methods which throws/catches exceptions will be "       \
568           "deopt and intp.")                                                \
569                                                                             \
570   develop(bool, ConvertCmpD2CmpF, true,                                     \
571           "Convert cmpD to cmpF when one input is constant in float range") \
572                                                                             \
573   develop(bool, ConvertFloat2IntClipping, true,                             \
574           "Convert float2int clipping idiom to integer clipping")           \
575                                                                             \
576   develop(bool, MonomorphicArrayCheck, true,                                \
577           "Uncommon-trap array store checks that require full type check")  \
578                                                                             \
579   notproduct(bool, TracePhaseCCP, false,                                    \
580           "Print progress during Conditional Constant Propagation")         \
581                                                                             \
582   develop(bool, PrintDominators, false,                                     \
583           "Print out dominator trees for GVN")                              \
584                                                                             \
585   product(bool, TraceSpilling, false, DIAGNOSTIC,                           \
586           "Trace spilling")                                                 \
587                                                                             \
588   product(bool, TraceTypeProfile, false, DIAGNOSTIC,                        \
589           "Trace type profile")                                             \
590                                                                             \
591   develop(bool, PoisonOSREntry, true,                                       \
592            "Detect abnormal calls to OSR code")                             \
593                                                                             \
594   develop(bool, SoftMatchFailure, trueInProduct,                            \
595           "If the DFA fails to match a node, print a message and bail out") \
596                                                                             \
597   develop(bool, InlineAccessors, true,                                      \
598           "inline accessor methods (get/set)")                              \
599                                                                             \
600   product(intx, TypeProfileMajorReceiverPercent, 90,                        \
601           "% of major receiver type to all profiled receivers")             \
602           range(0, 100)                                                     \
603                                                                             \
604   product(bool, PrintIntrinsics, false, DIAGNOSTIC,                         \
605           "prints attempted and successful inlining of intrinsics")         \
606                                                                             \
607   develop(bool, StressReflectiveCode, false,                                \
608           "Use inexact types at allocations, etc., to test reflection")     \
609                                                                             \
610   product(bool, DebugInlinedCalls, true, DIAGNOSTIC,                        \
611          "If false, restricts profiled locations to the root method only")  \
612                                                                             \
613   notproduct(bool, VerifyLoopOptimizations, false,                          \
614           "verify major loop optimizations")                                \
615                                                                             \
616   product(bool, ProfileDynamicTypes, true, DIAGNOSTIC,                      \
617           "do extra type profiling and use it more aggressively")           \
618                                                                             \
619   develop(bool, TraceIterativeGVN, false,                                   \
620           "Print progress during Iterative Global Value Numbering")         \
621                                                                             \
622   develop(uint, VerifyIterativeGVN, 0,                                      \
623           "Verify Iterative Global Value Numbering"                         \
624           "=XY, with Y: verify Def-Use modifications during IGVN"           \
625           "          X: verify that type(n) == n->Value() after IGVN"       \
626           "X and Y in 0=off; 1=on")                                         \
627           constraint(VerifyIterativeGVNConstraintFunc, AtParse)             \
628                                                                             \
629   notproduct(bool, TraceCISCSpill, false,                                   \
630           "Trace allocators use of cisc spillable instructions")            \
631                                                                             \
632   product(bool, SplitIfBlocks, true,                                        \
633           "Clone compares and control flow through merge points to fold "   \
634           "some branches")                                                  \
635                                                                             \
636   develop(intx, FreqCountInvocations,  1,                                   \
637           "Scaling factor for branch frequencies (deprecated)")             \
638           range(1, max_intx)                                                \
639                                                                             \
640   develop(bool, VerifyAliases, false,                                       \
641           "perform extra checks on the results of alias analysis")          \
642                                                                             \
643   product(intx, MaxInlineLevel, 15,                                         \
644           "maximum number of nested calls that are inlined by high tier "   \
645           "compiler")                                                       \
646           range(0, max_jint)                                                \
647                                                                             \
648   product(intx, MaxRecursiveInlineLevel, 1,                                 \
649           "maximum number of nested recursive calls that are inlined by "   \
650           "high tier compiler")                                             \
651           range(0, max_jint)                                                \
652                                                                             \
653   product_pd(intx, InlineSmallCode,                                         \
654           "Only inline already compiled methods if their code size is "     \
655           "less than this")                                                 \
656           range(0, max_jint)                                                \
657                                                                             \
658   product(intx, MaxInlineSize, 35,                                          \
659           "The maximum bytecode size of a method to be inlined by high "    \
660           "tier compiler")                                                  \
661           range(0, max_jint)                                                \
662                                                                             \
663   product_pd(intx, FreqInlineSize,                                          \
664           "The maximum bytecode size of a frequent method to be inlined")   \
665           range(0, max_jint)                                                \
666                                                                             \
667   product(intx, MaxTrivialSize, 6,                                          \
668           "The maximum bytecode size of a trivial method to be inlined by " \
669           "high tier compiler")                                             \
670           range(0, max_jint)                                                \
671                                                                             \
672   product(bool, IncrementalInline, true,                                    \
673           "do post parse inlining")                                         \
674                                                                             \
675   product(bool, IncrementalInlineMH, true, DIAGNOSTIC,                      \
676           "do post parse inlining of method handle calls")                  \
677                                                                             \
678   product(bool, IncrementalInlineVirtual, true, DIAGNOSTIC,                 \
679           "do post parse inlining of virtual calls")                        \
680                                                                             \
681   develop(bool, AlwaysIncrementalInline, false,                             \
682           "do all inlining incrementally")                                  \
683                                                                             \
684   product(bool, IncrementalInlineForceCleanup, false, DIAGNOSTIC,           \
685           "do cleanup after every iteration of incremental inlining")       \
686                                                                             \
687   product(intx, LiveNodeCountInliningCutoff, 40000,                         \
688           "max number of live nodes in a method")                           \
689           range(0, max_juint / 8)                                           \
690                                                                             \
691   product(bool, OptimizeExpensiveOps, true, DIAGNOSTIC,                     \
692           "Find best control for expensive operations")                     \
693                                                                             \
694   product(bool, UseMathExactIntrinsics, true, DIAGNOSTIC,                   \
695           "Enables intrinsification of various java.lang.Math functions")   \
696                                                                             \
697   product(bool, UseCharacterCompareIntrinsics, false, DIAGNOSTIC,           \
698           "Enables intrinsification of java.lang.Character functions")      \
699                                                                             \
700   product(bool, UseMultiplyToLenIntrinsic, false, DIAGNOSTIC,               \
701           "Enables intrinsification of BigInteger.multiplyToLen()")         \
702                                                                             \
703   product(bool, UseSquareToLenIntrinsic, false, DIAGNOSTIC,                 \
704           "Enables intrinsification of BigInteger.squareToLen()")           \
705                                                                             \
706   product(bool, UseMulAddIntrinsic, false, DIAGNOSTIC,                      \
707           "Enables intrinsification of BigInteger.mulAdd()")                \
708                                                                             \
709   product(bool, UseMontgomeryMultiplyIntrinsic, false, DIAGNOSTIC,          \
710           "Enables intrinsification of BigInteger.montgomeryMultiply()")    \
711                                                                             \
712   product(bool, UseMontgomerySquareIntrinsic, false, DIAGNOSTIC,            \
713           "Enables intrinsification of BigInteger.montgomerySquare()")      \
714                                                                             \
715   product(bool, EnableVectorSupport, false, EXPERIMENTAL,                   \
716           "Enables VectorSupport intrinsics")                               \
717                                                                             \
718   product(bool, EnableVectorReboxing, false, EXPERIMENTAL,                  \
719           "Enables reboxing of vectors")                                    \
720                                                                             \
721   product(bool, EnableVectorAggressiveReboxing, false, EXPERIMENTAL,        \
722           "Enables aggressive reboxing of vectors")                         \
723                                                                             \
724   product(bool, UseVectorStubs, false, EXPERIMENTAL,                        \
725           "Use stubs for vector transcendental operations")                 \
726                                                                             \
727   product(bool, UseTypeSpeculation, true,                                   \
728           "Speculatively propagate types from profiles")                    \
729                                                                             \
730   product(bool, UseInlineDepthForSpeculativeTypes, true, DIAGNOSTIC,        \
731           "Carry inline depth of profile point with speculative type "      \
732           "and give priority to profiling from lower inline depth")         \
733                                                                             \
734   product_pd(bool, TrapBasedRangeChecks,                                    \
735           "Generate code for range checks that uses a cmp and trap "        \
736           "instruction raising SIGTRAP. Used on PPC64.")                    \
737                                                                             \
738   product(intx, ArrayCopyLoadStoreMaxElem, 8,                               \
739           "Maximum number of arraycopy elements inlined as a sequence of"   \
740           "loads/stores")                                                   \
741           range(0, max_intx)                                                \
742                                                                             \
743   develop(bool, StressArrayCopyMacroNode, false,                            \
744           "Perform ArrayCopy load/store replacement during IGVN only")      \
745                                                                             \
746   develop(bool, RenumberLiveNodes, true,                                    \
747           "Renumber live nodes")                                            \
748                                                                             \
749   product(uintx, LoopStripMiningIter, 0,                                    \
750           "Number of iterations in strip mined loop")                       \
751           range(0, max_juint)                                               \
752           constraint(LoopStripMiningIterConstraintFunc, AfterErgo)          \
753                                                                             \
754   product(uintx, LoopStripMiningIterShortLoop, 0,                           \
755           "Loop with fewer iterations are not strip mined")                 \
756           range(0, max_juint)                                               \
757                                                                             \
758   product(bool, UseProfiledLoopPredicate, true,                             \
759           "Move predicates out of loops based on profiling data")           \
760                                                                             \
761   product(bool, UseArrayLoadStoreProfile, true,                             \
762           "Take advantage of profiling at array load/store")                \
763                                                                             \
764   product(bool, UseACmpProfile, true,                                       \
765           "Take advantage of profiling at acmp")                            \
766                                                                             \
767   product(bool, ExpandSubTypeCheckAtParseTime, false, DIAGNOSTIC,           \
768           "Do not use subtype check macro node")                            \
769                                                                             \
770   develop(uintx, StressLongCountedLoop, 0,                                  \
771           "if > 0, convert int counted loops to long counted loops"         \
772           "to stress handling of long counted loops: run inner loop"        \
773           "for at most jint_max / StressLongCountedLoop")                   \
774           range(0, max_juint)                                               \
775                                                                             \
776   product(bool, DuplicateBackedge, true, DIAGNOSTIC,                        \
777           "Transform loop with a merge point into 2 loops if inner loop is" \
778           "expected to optimize better")                                    \
779                                                                             \
780   develop(bool, StressDuplicateBackedge, false,                             \
781           "Run DuplicateBackedge whenever possible ignoring benefit"        \
782           "analysis")                                                       \
783                                                                             \
784   product(bool, VerifyReceiverTypes, trueInDebug, DIAGNOSTIC,               \
785           "Verify receiver types at runtime")                               \
786                                                                             \
787   product(intx, TypeProfileSubTypeCheckCommonThreshold, 50,                 \
788           "Use profile data at type check if profiled types account for"    \
789           "more than this threshold")                                       \
790           range(0, 100)                                                     \
791                                                                             \
792 
793 // end of C2_FLAGS
794 
795 DECLARE_FLAGS(C2_FLAGS)
796 
797 #endif // SHARE_OPTO_C2_GLOBALS_HPP