1 /*
   2  * Copyright (c) 2000, 2013, 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_VM_OPTO_C2_GLOBALS_HPP
  26 #define SHARE_VM_OPTO_C2_GLOBALS_HPP
  27 
  28 #include "runtime/globals.hpp"
  29 #ifdef TARGET_ARCH_x86
  30 # include "c2_globals_x86.hpp"
  31 #endif
  32 #ifdef TARGET_ARCH_sparc
  33 # include "c2_globals_sparc.hpp"
  34 #endif
  35 #ifdef TARGET_ARCH_arm
  36 # include "c2_globals_arm.hpp"
  37 #endif
  38 #ifdef TARGET_ARCH_ppc
  39 # include "c2_globals_ppc.hpp"
  40 #endif
  41 #ifdef TARGET_ARCH_aarch32
  42 # include "c2_globals_aarch32.hpp"
  43 #endif
  44 #ifdef TARGET_OS_FAMILY_linux
  45 # include "c2_globals_linux.hpp"
  46 #endif
  47 #ifdef TARGET_OS_FAMILY_solaris
  48 # include "c2_globals_solaris.hpp"
  49 #endif
  50 #ifdef TARGET_OS_FAMILY_windows
  51 # include "c2_globals_windows.hpp"
  52 #endif
  53 #ifdef TARGET_OS_FAMILY_aix
  54 # include "c2_globals_aix.hpp"
  55 #endif
  56 #ifdef TARGET_OS_FAMILY_bsd
  57 # include "c2_globals_bsd.hpp"
  58 #endif
  59 
  60 //
  61 // Defines all globals flags used by the server compiler.
  62 //
  63 
  64 #define C2_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct) \
  65                                                                             \
  66   develop(bool, StressLCM, false,                                           \
  67           "Randomize instruction scheduling in LCM")                        \
  68                                                                             \
  69   develop(bool, StressGCM, false,                                           \
  70           "Randomize instruction scheduling in GCM")                        \
  71                                                                             \
  72   notproduct(intx, CompileZapFirst, 0,                                      \
  73           "If +ZapDeadCompiledLocals, "                                     \
  74           "skip this many before compiling in zap calls")                   \
  75                                                                             \
  76   notproduct(intx, CompileZapLast, -1,                                      \
  77           "If +ZapDeadCompiledLocals, "                                     \
  78           "compile this many after skipping (incl. skip count, -1 = all)")  \
  79                                                                             \
  80   notproduct(intx, ZapDeadCompiledLocalsFirst, 0,                           \
  81           "If +ZapDeadCompiledLocals, "                                     \
  82           "skip this many before really doing it")                          \
  83                                                                             \
  84   notproduct(intx, ZapDeadCompiledLocalsLast, -1,                           \
  85           "If +ZapDeadCompiledLocals, "                                     \
  86           "do this many after skipping (incl. skip count, -1 = all)")       \
  87                                                                             \
  88   develop(intx, OptoPrologueNops, 0,                                        \
  89           "Insert this many extra nop instructions "                        \
  90           "in the prologue of every nmethod")                               \
  91                                                                             \
  92   product_pd(intx, InteriorEntryAlignment,                                  \
  93           "Code alignment for interior entry points "                       \
  94           "in generated code (in bytes)")                                   \
  95                                                                             \
  96   product(intx, MaxLoopPad, (OptoLoopAlignment-1),                          \
  97           "Align a loop if padding size in bytes is less or equal to this value") \
  98                                                                             \
  99   product(intx, MaxVectorSize, 32,                                          \
 100           "Max vector size in bytes, "                                      \
 101           "actual size could be less depending on elements type")           \
 102                                                                             \
 103   product(bool, AlignVector, true,                                          \
 104           "Perform vector store/load alignment in loop")                    \
 105                                                                             \
 106   product(intx, NumberOfLoopInstrToAlign, 4,                                \
 107           "Number of first instructions in a loop to align")                \
 108                                                                             \
 109   notproduct(intx, IndexSetWatch, 0,                                        \
 110           "Trace all operations on this IndexSet (-1 means all, 0 none)")   \
 111                                                                             \
 112   develop(intx, OptoNodeListSize, 4,                                        \
 113           "Starting allocation size of Node_List data structures")          \
 114                                                                             \
 115   develop(intx, OptoBlockListSize, 8,                                       \
 116           "Starting allocation size of Block_List data structures")         \
 117                                                                             \
 118   develop(intx, OptoPeepholeAt, -1,                                         \
 119           "Apply peephole optimizations to this peephole rule")             \
 120                                                                             \
 121   notproduct(bool, PrintIdeal, false,                                       \
 122           "Print ideal graph before code generation")                       \
 123                                                                             \
 124   notproduct(bool, PrintOpto, false,                                        \
 125           "Print compiler2 attempts")                                       \
 126                                                                             \
 127   notproduct(bool, PrintOptoInlining, false,                                \
 128           "Print compiler2 inlining decisions")                             \
 129                                                                             \
 130   notproduct(bool, VerifyOpto, false,                                       \
 131           "Apply more time consuming verification during compilation")      \
 132                                                                             \
 133   notproduct(bool, VerifyIdealNodeCount, false,                             \
 134           "Verify that tracked dead ideal node count is accurate")          \
 135                                                                             \
 136   notproduct(bool, PrintIdealNodeCount, false,                              \
 137           "Print liveness counts of ideal nodes")                           \
 138                                                                             \
 139   notproduct(bool, VerifyOptoOopOffsets, false,                             \
 140           "Check types of base addresses in field references")              \
 141                                                                             \
 142   develop(bool, IdealizedNumerics, false,                                   \
 143           "Check performance difference allowing FP "                       \
 144           "associativity and commutativity...")                             \
 145                                                                             \
 146   develop(bool, OptoBreakpoint, false,                                      \
 147           "insert breakpoint at method entry")                              \
 148                                                                             \
 149   notproduct(bool, OptoBreakpointOSR, false,                                \
 150           "insert breakpoint at osr method entry")                          \
 151                                                                             \
 152   notproduct(intx, BreakAtNode, 0,                                          \
 153           "Break at construction of this Node (either _idx or _debug_idx)") \
 154                                                                             \
 155   notproduct(bool, OptoBreakpointC2R, false,                                \
 156           "insert breakpoint at runtime stub entry")                        \
 157                                                                             \
 158   notproduct(bool, OptoNoExecute, false,                                    \
 159           "Attempt to parse and compile but do not execute generated code") \
 160                                                                             \
 161   notproduct(bool, PrintOptoStatistics, false,                              \
 162           "Print New compiler statistics")                                  \
 163                                                                             \
 164   notproduct(bool, PrintOptoAssembly, false,                                \
 165           "Print New compiler assembly output")                             \
 166                                                                             \
 167   develop_pd(bool, OptoPeephole,                                            \
 168           "Apply peephole optimizations after register allocation")         \
 169                                                                             \
 170   develop(bool, OptoRemoveUseless, true,                                    \
 171           "Remove useless nodes after parsing")                             \
 172                                                                             \
 173   notproduct(bool, PrintFrameConverterAssembly, false,                      \
 174           "Print New compiler assembly output for frame converters")        \
 175                                                                             \
 176   notproduct(bool, PrintParseStatistics, false,                             \
 177           "Print nodes, transforms and new values made per bytecode parsed")\
 178                                                                             \
 179   notproduct(bool, PrintOptoPeephole, false,                                \
 180           "Print New compiler peephole replacements")                       \
 181                                                                             \
 182   develop(bool, PrintCFGBlockFreq, false,                                   \
 183           "Print CFG block freqencies")                                     \
 184                                                                             \
 185   develop(bool, TraceOptoParse, false,                                      \
 186           "Trace bytecode parse and control-flow merge")                    \
 187                                                                             \
 188   product_pd(intx,  LoopUnrollLimit,                                        \
 189           "Unroll loop bodies with node count less than this")              \
 190                                                                             \
 191   product(intx,  LoopMaxUnroll, 16,                                         \
 192           "Maximum number of unrolls for main loop")                        \
 193                                                                             \
 194   product(intx,  LoopUnrollMin, 4,                                          \
 195           "Minimum number of unroll loop bodies before checking progress"   \
 196           "of rounds of unroll,optimize,..")                                \
 197                                                                             \
 198   develop(intx, UnrollLimitForProfileCheck, 1,                              \
 199           "Don't use profile_trip_cnt() to restrict unrolling until "       \
 200           "unrolling would push the number of unrolled iterations above "   \
 201           "UnrollLimitForProfileCheck. A higher value allows more "         \
 202           "unrolling. Zero acts as a very large value." )                   \
 203                                                                             \
 204   product(intx, MultiArrayExpandLimit, 6,                                   \
 205           "Maximum number of individual allocations in an inline-expanded " \
 206           "multianewarray instruction")                                     \
 207                                                                             \
 208   notproduct(bool, TraceProfileTripCount, false,                            \
 209           "Trace profile loop trip count information")                      \
 210                                                                             \
 211   product(bool, UseCountedLoopSafepoints, false,                            \
 212           "Force counted loops to keep a safepoint")                        \
 213                                                                             \
 214   product(bool, UseLoopPredicate, true,                                     \
 215           "Generate a predicate to select fast/slow loop versions")         \
 216                                                                             \
 217   develop(bool, TraceLoopPredicate, false,                                  \
 218           "Trace generation of loop predicates")                            \
 219                                                                             \
 220   develop(bool, TraceLoopOpts, false,                                       \
 221           "Trace executed loop optimizations")                              \
 222                                                                             \
 223   diagnostic(bool, LoopLimitCheck, true,                                    \
 224           "Generate a loop limits check for overflow")                      \
 225                                                                             \
 226   develop(bool, TraceLoopLimitCheck, false,                                 \
 227           "Trace generation of loop limits checks")                         \
 228                                                                             \
 229   diagnostic(bool, RangeLimitCheck, true,                                   \
 230           "Additional overflow checks during range check elimination")      \
 231                                                                             \
 232   develop(bool, TraceRangeLimitCheck, false,                                \
 233           "Trace additional overflow checks in RCE")                        \
 234                                                                             \
 235   diagnostic(bool, UnrollLimitCheck, true,                                  \
 236           "Additional overflow checks during loop unroll")                  \
 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   develop(bool, UseExactTypes, true,                                        \
 252           "Use exact types to eliminate array store checks and v-calls")    \
 253                                                                             \
 254   product(intx, TrackedInitializationLimit, 50,                             \
 255           "When initializing fields, track up to this many words")          \
 256                                                                             \
 257   product(bool, ReduceFieldZeroing, true,                                   \
 258           "When initializing fields, try to avoid needless zeroing")        \
 259                                                                             \
 260   product(bool, ReduceInitialCardMarks, true,                               \
 261           "When initializing fields, try to avoid needless card marks")     \
 262                                                                             \
 263   product(bool, ReduceBulkZeroing, true,                                    \
 264           "When bulk-initializing, try to avoid needless zeroing")          \
 265                                                                             \
 266   product(bool, UseFPUForSpilling, false,                                   \
 267           "Spill integer registers to FPU instead of stack when possible")  \
 268                                                                             \
 269   develop_pd(intx, RegisterCostAreaRatio,                                   \
 270           "Spill selection in reg allocator: scale area by (X/64K) before " \
 271           "adding cost")                                                    \
 272                                                                             \
 273   develop_pd(bool, UseCISCSpill,                                            \
 274           "Use ADLC supplied cisc instructions during allocation")          \
 275                                                                             \
 276   notproduct(bool, VerifyGraphEdges , false,                                \
 277           "Verify Bi-directional Edges")                                    \
 278                                                                             \
 279   notproduct(bool, VerifyDUIterators, true,                                 \
 280           "Verify the safety of all iterations of Bi-directional Edges")    \
 281                                                                             \
 282   notproduct(bool, VerifyHashTableKeys, true,                               \
 283           "Verify the immutability of keys in the VN hash tables")          \
 284                                                                             \
 285   notproduct(bool, VerifyRegisterAllocator , false,                         \
 286           "Verify Register Allocator")                                      \
 287                                                                             \
 288   develop_pd(intx, FLOATPRESSURE,                                           \
 289           "Number of float LRG's that constitute high register pressure")   \
 290                                                                             \
 291   develop_pd(intx, INTPRESSURE,                                             \
 292           "Number of integer LRG's that constitute high register pressure") \
 293                                                                             \
 294   notproduct(bool, TraceOptoPipelining, false,                              \
 295           "Trace pipelining information")                                   \
 296                                                                             \
 297   notproduct(bool, TraceOptoOutput, false,                                  \
 298           "Trace pipelining information")                                   \
 299                                                                             \
 300   product_pd(bool, OptoScheduling,                                          \
 301           "Instruction Scheduling after register allocation")               \
 302                                                                             \
 303   product(bool, PartialPeelLoop, true,                                      \
 304           "Partial peel (rotate) loops")                                    \
 305                                                                             \
 306   product(intx, PartialPeelNewPhiDelta, 0,                                  \
 307           "Additional phis that can be created by partial peeling")         \
 308                                                                             \
 309   notproduct(bool, TracePartialPeeling, false,                              \
 310           "Trace partial peeling (loop rotation) information")              \
 311                                                                             \
 312   product(bool, PartialPeelAtUnsignedTests, true,                           \
 313           "Partial peel at unsigned tests if no signed test exists")        \
 314                                                                             \
 315   product(bool, ReassociateInvariants, true,                                \
 316           "Enable reassociation of expressions with loop invariants.")      \
 317                                                                             \
 318   product(bool, LoopUnswitching, true,                                      \
 319           "Enable loop unswitching (a form of invariant test hoisting)")    \
 320                                                                             \
 321   notproduct(bool, TraceLoopUnswitching, false,                             \
 322           "Trace loop unswitching")                                         \
 323                                                                             \
 324   product(bool, UseSuperWord, true,                                         \
 325           "Transform scalar operations into superword operations")          \
 326                                                                             \
 327   develop(bool, SuperWordRTDepCheck, false,                                 \
 328           "Enable runtime dependency checks.")                              \
 329                                                                             \
 330   notproduct(bool, TraceSuperWord, false,                                   \
 331           "Trace superword transforms")                                     \
 332                                                                             \
 333   notproduct(bool, TraceNewVectors, false,                                  \
 334           "Trace creation of Vector nodes")                                 \
 335                                                                             \
 336   product_pd(bool, OptoBundling,                                            \
 337           "Generate nops to fill i-cache lines")                            \
 338                                                                             \
 339   product_pd(intx, ConditionalMoveLimit,                                    \
 340           "Limit of ops to make speculative when using CMOVE")              \
 341                                                                             \
 342   /* Set BranchOnRegister == false. See 4965987. */                         \
 343   product(bool, BranchOnRegister, false,                                    \
 344           "Use Sparc V9 branch-on-register opcodes")                        \
 345                                                                             \
 346   develop(bool, SparcV9RegsHiBitsZero, true,                                \
 347           "Assume Sparc V9 I&L registers on V8+ systems are zero-extended") \
 348                                                                             \
 349   product(bool, UseRDPCForConstantTableBase, false,                         \
 350           "Use Sparc RDPC instruction for the constant table base.")        \
 351                                                                             \
 352   develop(intx, PrintIdealGraphLevel, 0,                                    \
 353           "Print ideal graph to XML file / network interface. "             \
 354           "By default attempts to connect to the visualizer on a socket.")  \
 355                                                                             \
 356   develop(intx, PrintIdealGraphPort, 4444,                                  \
 357           "Ideal graph printer to network port")                            \
 358                                                                             \
 359   notproduct(ccstr, PrintIdealGraphAddress, "127.0.0.1",                    \
 360           "IP address to connect to visualizer")                            \
 361                                                                             \
 362   notproduct(ccstr, PrintIdealGraphFile, NULL,                              \
 363           "File to dump ideal graph to.  If set overrides the "             \
 364           "use of the network")                                             \
 365                                                                             \
 366   product(bool, UseBimorphicInlining, true,                                 \
 367           "Profiling based inlining for two receivers")                     \
 368                                                                             \
 369   product(bool, UseOnlyInlinedBimorphic, true,                              \
 370           "Don't use BimorphicInlining if can't inline a second method")    \
 371                                                                             \
 372   product(bool, InsertMemBarAfterArraycopy, true,                           \
 373           "Insert memory barrier after arraycopy call")                     \
 374                                                                             \
 375   develop(bool, SubsumeLoads, true,                                         \
 376           "Attempt to compile while subsuming loads into machine instructions.") \
 377                                                                             \
 378   develop(bool, StressRecompilation, false,                                 \
 379           "Recompile each compiled method without subsuming loads or escape analysis.") \
 380                                                                             \
 381   develop(intx, ImplicitNullCheckThreshold, 3,                              \
 382           "Don't do implicit null checks if NPE's in a method exceeds limit") \
 383                                                                             \
 384   product(intx, LoopOptsCount, 43,                                          \
 385           "Set level of loop optimization for tier 1 compiles")             \
 386                                                                             \
 387   /* controls for heat-based inlining */                                    \
 388                                                                             \
 389   develop(intx, NodeCountInliningCutoff, 18000,                             \
 390           "If parser node generation exceeds limit stop inlining")          \
 391                                                                             \
 392   develop(intx, NodeCountInliningStep, 1000,                                \
 393           "Target size of warm calls inlined between optimization passes")  \
 394                                                                             \
 395   develop(bool, InlineWarmCalls, false,                                     \
 396           "Use a heat-based priority queue to govern inlining")             \
 397                                                                             \
 398   develop(intx, HotCallCountThreshold, 999999,                              \
 399           "large numbers of calls (per method invocation) force hotness")   \
 400                                                                             \
 401   develop(intx, HotCallProfitThreshold, 999999,                             \
 402           "highly profitable inlining opportunities force hotness")         \
 403                                                                             \
 404   develop(intx, HotCallTrivialWork, -1,                                     \
 405           "trivial execution time (no larger than this) forces hotness")    \
 406                                                                             \
 407   develop(intx, HotCallTrivialSize, -1,                                     \
 408           "trivial methods (no larger than this) force calls to be hot")    \
 409                                                                             \
 410   develop(intx, WarmCallMinCount, -1,                                       \
 411           "number of calls (per method invocation) to enable inlining")     \
 412                                                                             \
 413   develop(intx, WarmCallMinProfit, -1,                                      \
 414           "number of calls (per method invocation) to enable inlining")     \
 415                                                                             \
 416   develop(intx, WarmCallMaxWork, 999999,                                    \
 417           "execution time of the largest inlinable method")                 \
 418                                                                             \
 419   develop(intx, WarmCallMaxSize, 999999,                                    \
 420           "size of the largest inlinable method")                           \
 421                                                                             \
 422   product(intx, MaxNodeLimit, 80000,                                        \
 423           "Maximum number of nodes")                                        \
 424                                                                             \
 425   product(intx, NodeLimitFudgeFactor, 2000,                                 \
 426           "Fudge Factor for certain optimizations")                         \
 427                                                                             \
 428   product(bool, UseJumpTables, true,                                        \
 429           "Use JumpTables instead of a binary search tree for switches")    \
 430                                                                             \
 431   product(bool, UseDivMod, true,                                            \
 432           "Use combined DivMod instruction if available")                   \
 433                                                                             \
 434   product_pd(intx, MinJumpTableSize,                                        \
 435           "Minimum number of targets in a generated jump table")            \
 436                                                                             \
 437   product(intx, MaxJumpTableSize, 65000,                                    \
 438           "Maximum number of targets in a generated jump table")            \
 439                                                                             \
 440   product(intx, MaxJumpTableSparseness, 5,                                  \
 441           "Maximum sparseness for jumptables")                              \
 442                                                                             \
 443   product(bool, EliminateLocks, true,                                       \
 444           "Coarsen locks when possible")                                    \
 445                                                                             \
 446   product(bool, EliminateNestedLocks, true,                                 \
 447           "Eliminate nested locks of the same object when possible")        \
 448                                                                             \
 449   notproduct(bool, PrintLockStatistics, false,                              \
 450           "Print precise statistics on the dynamic lock usage")             \
 451                                                                             \
 452   diagnostic(bool, PrintPreciseBiasedLockingStatistics, false,              \
 453           "Print per-lock-site statistics of biased locking in JVM")        \
 454                                                                             \
 455   diagnostic(bool, PrintPreciseRTMLockingStatistics, false,                 \
 456           "Print per-lock-site statistics of rtm locking in JVM")           \
 457                                                                             \
 458   notproduct(bool, PrintEliminateLocks, false,                              \
 459           "Print out when locks are eliminated")                            \
 460                                                                             \
 461   product(bool, EliminateAutoBox, true,                                     \
 462           "Control optimizations for autobox elimination")                  \
 463                                                                             \
 464   diagnostic(bool, UseImplicitStableValues, true,                           \
 465           "Mark well-known stable fields as such (e.g. String.value)")      \
 466                                                                             \
 467   product(intx, AutoBoxCacheMax, 128,                                       \
 468           "Sets max value cached by the java.lang.Integer autobox cache")   \
 469                                                                             \
 470   experimental(bool, AggressiveUnboxing, false,                             \
 471           "Control optimizations for aggressive boxing elimination")        \
 472                                                                             \
 473   develop(bool, TracePostallocExpand, false, "Trace expanding nodes after"  \
 474           " register allocation.")                                          \
 475                                                                             \
 476   product(bool, DoEscapeAnalysis, true,                                     \
 477           "Perform escape analysis")                                        \
 478                                                                             \
 479   product(double, EscapeAnalysisTimeout, 20. DEBUG_ONLY(+40.),              \
 480           "Abort EA when it reaches time limit (in sec)")                   \
 481                                                                             \
 482   develop(bool, ExitEscapeAnalysisOnTimeout, true,                          \
 483           "Exit or throw assert in EA when it reaches time limit")          \
 484                                                                             \
 485   notproduct(bool, PrintEscapeAnalysis, false,                              \
 486           "Print the results of escape analysis")                           \
 487                                                                             \
 488   product(bool, EliminateAllocations, true,                                 \
 489           "Use escape analysis to eliminate allocations")                   \
 490                                                                             \
 491   notproduct(bool, PrintEliminateAllocations, false,                        \
 492           "Print out when allocations are eliminated")                      \
 493                                                                             \
 494   product(intx, EliminateAllocationArraySizeLimit, 64,                      \
 495           "Array size (number of elements) limit for scalar replacement")   \
 496                                                                             \
 497   product(bool, OptimizePtrCompare, true,                                   \
 498           "Use escape analysis to optimize pointers compare")               \
 499                                                                             \
 500   notproduct(bool, PrintOptimizePtrCompare, false,                          \
 501           "Print information about optimized pointers compare")             \
 502                                                                             \
 503   notproduct(bool, VerifyConnectionGraph , true,                            \
 504           "Verify Connection Graph construction in Escape Analysis")        \
 505                                                                             \
 506   product(bool, UseOptoBiasInlining, true,                                  \
 507           "Generate biased locking code in C2 ideal graph")                 \
 508                                                                             \
 509   product(bool, OptimizeStringConcat, true,                                 \
 510           "Optimize the construction of Strings by StringBuilder")          \
 511                                                                             \
 512   notproduct(bool, PrintOptimizeStringConcat, false,                        \
 513           "Print information about transformations performed on Strings")   \
 514                                                                             \
 515   product(intx, ValueSearchLimit, 1000,                                     \
 516           "Recursion limit in PhaseMacroExpand::value_from_mem_phi")        \
 517                                                                             \
 518   product(intx, MaxLabelRootDepth, 1100,                                    \
 519           "Maximum times call Label_Root to prevent stack overflow")        \
 520                                                                             \
 521   diagnostic(intx, DominatorSearchLimit, 1000,                              \
 522           "Iterations limit in Node::dominates")                            \
 523                                                                             \
 524   product(bool, BlockLayoutByFrequency, true,                               \
 525           "Use edge frequencies to drive block ordering")                   \
 526                                                                             \
 527   product(intx, BlockLayoutMinDiamondPercentage, 20,                        \
 528           "Miniumum %% of a successor (predecessor) for which block layout "\
 529           "a will allow a fork (join) in a single chain")                   \
 530                                                                             \
 531   product(bool, BlockLayoutRotateLoops, true,                               \
 532           "Allow back branches to be fall throughs in the block layour")    \
 533                                                                             \
 534   develop(bool, InlineReflectionGetCallerClass, true,                       \
 535           "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
 536           "of base library DLL")                                            \
 537                                                                             \
 538   develop(bool, InlineObjectCopy, true,                                     \
 539           "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
 540                                                                             \
 541   develop(bool, SpecialStringCompareTo, true,                               \
 542           "special version of string compareTo")                            \
 543                                                                             \
 544   develop(bool, SpecialStringIndexOf, true,                                 \
 545           "special version of string indexOf")                              \
 546                                                                             \
 547   develop(bool, SpecialStringEquals, true,                                  \
 548           "special version of string equals")                               \
 549                                                                             \
 550   develop(bool, SpecialArraysEquals, true,                                  \
 551           "special version of Arrays.equals(char[],char[])")                \
 552                                                                             \
 553   product(bool, SpecialEncodeISOArray, true,                                \
 554           "special version of ISO_8859_1$Encoder.encodeISOArray")           \
 555                                                                             \
 556   develop(bool, BailoutToInterpreterForThrows, false,                       \
 557           "Compiled methods which throws/catches exceptions will be "       \
 558           "deopt and intp.")                                                \
 559                                                                             \
 560   develop(bool, ConvertCmpD2CmpF, true,                                     \
 561           "Convert cmpD to cmpF when one input is constant in float range") \
 562                                                                             \
 563   develop(bool, ConvertFloat2IntClipping, true,                             \
 564           "Convert float2int clipping idiom to integer clipping")           \
 565                                                                             \
 566   develop(bool, Use24BitFPMode, true,                                       \
 567           "Set 24-bit FPU mode on a per-compile basis ")                    \
 568                                                                             \
 569   develop(bool, Use24BitFP, true,                                           \
 570           "use FP instructions that produce 24-bit precise results")        \
 571                                                                             \
 572   develop(bool, MonomorphicArrayCheck, true,                                \
 573           "Uncommon-trap array store checks that require full type check")  \
 574                                                                             \
 575   notproduct(bool, TracePhaseCCP, false,                                    \
 576           "Print progress during Conditional Constant Propagation")         \
 577                                                                             \
 578   develop(bool, PrintDominators, false,                                     \
 579           "Print out dominator trees for GVN")                              \
 580                                                                             \
 581   notproduct(bool, TraceSpilling, false,                                    \
 582           "Trace spilling")                                                 \
 583                                                                             \
 584   diagnostic(bool, TraceTypeProfile, false,                                 \
 585           "Trace type profile")                                             \
 586                                                                             \
 587   develop(bool, PoisonOSREntry, true,                                       \
 588            "Detect abnormal calls to OSR code")                             \
 589                                                                             \
 590   product(bool, UseCondCardMark, false,                                     \
 591           "Check for already marked card before updating card table")       \
 592                                                                             \
 593   develop(bool, SoftMatchFailure, trueInProduct,                            \
 594           "If the DFA fails to match a node, print a message and bail out") \
 595                                                                             \
 596   develop(bool, InlineAccessors, true,                                      \
 597           "inline accessor methods (get/set)")                              \
 598                                                                             \
 599   product(intx, TypeProfileMajorReceiverPercent, 90,                        \
 600           "% of major receiver type to all profiled receivers")             \
 601                                                                             \
 602   notproduct(bool, TimeCompiler2, false,                                    \
 603           "detailed time the compiler (requires +TimeCompiler)")            \
 604                                                                             \
 605   diagnostic(bool, PrintIntrinsics, false,                                  \
 606           "prints attempted and successful inlining of intrinsics")         \
 607                                                                             \
 608   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 609           "do not expand intrinsics whose (internal) names appear here")    \
 610                                                                             \
 611   develop(bool, StressReflectiveCode, false,                                \
 612           "Use inexact types at allocations, etc., to test reflection")     \
 613                                                                             \
 614   diagnostic(bool, DebugInlinedCalls, true,                                 \
 615          "If false, restricts profiled locations to the root method only")  \
 616                                                                             \
 617   notproduct(bool, VerifyLoopOptimizations, false,                          \
 618           "verify major loop optimizations")                                \
 619                                                                             \
 620   diagnostic(bool, ProfileDynamicTypes, true,                               \
 621           "do extra type profiling and use it more aggressively")           \
 622                                                                             \
 623   develop(bool, TraceIterativeGVN, false,                                   \
 624           "Print progress during Iterative Global Value Numbering")         \
 625                                                                             \
 626   develop(bool, VerifyIterativeGVN, false,                                  \
 627           "Verify Def-Use modifications during sparse Iterative Global "    \
 628           "Value Numbering")                                                \
 629                                                                             \
 630   notproduct(bool, TraceCISCSpill, false,                                   \
 631           "Trace allocators use of cisc spillable instructions")            \
 632                                                                             \
 633   product(bool, SplitIfBlocks, true,                                        \
 634           "Clone compares and control flow through merge points to fold "   \
 635           "some branches")                                                  \
 636                                                                             \
 637   develop(intx, FreqCountInvocations,  1,                                   \
 638           "Scaling factor for branch frequencies (deprecated)")             \
 639                                                                             \
 640   product(intx, AliasLevel,     3,                                          \
 641           "0 for no aliasing, 1 for oop/field/static/array split, "         \
 642           "2 for class split, 3 for unique instances")                      \
 643                                                                             \
 644   develop(bool, VerifyAliases, false,                                       \
 645           "perform extra checks on the results of alias analysis")          \
 646                                                                             \
 647   product(bool, IncrementalInline, true,                                    \
 648           "do post parse inlining")                                         \
 649                                                                             \
 650   develop(bool, AlwaysIncrementalInline, false,                             \
 651           "do all inlining incrementally")                                  \
 652                                                                             \
 653   product(intx, LiveNodeCountInliningCutoff, 40000,                         \
 654           "max number of live nodes in a method")                           \
 655                                                                             \
 656   diagnostic(bool, OptimizeExpensiveOps, true,                              \
 657           "Find best control for expensive operations")                     \
 658                                                                             \
 659   product(bool, UseMathExactIntrinsics, true,                               \
 660           "Enables intrinsification of various java.lang.Math functions")   \
 661                                                                             \
 662   product(bool, UseMultiplyToLenIntrinsic, false,                           \
 663           "Enables intrinsification of BigInteger.multiplyToLen()")         \
 664                                                                             \
 665   product(bool, UseSquareToLenIntrinsic, false,                             \
 666           "Enables intrinsification of BigInteger.squareToLen()")           \
 667                                                                             \
 668   product(bool, UseMulAddIntrinsic, false,                                  \
 669           "Enables intrinsification of BigInteger.mulAdd()")                \
 670                                                                             \
 671   product(bool, UseMontgomeryMultiplyIntrinsic, false,                      \
 672           "Enables intrinsification of BigInteger.montgomeryMultiply()")    \
 673                                                                             \
 674   product(bool, UseMontgomerySquareIntrinsic, false,                        \
 675           "Enables intrinsification of BigInteger.montgomerySquare()")      \
 676                                                                             \
 677   product(bool, UseTypeSpeculation, true,                                   \
 678           "Speculatively propagate types from profiles")                    \
 679                                                                             \
 680   diagnostic(bool, UseInlineDepthForSpeculativeTypes, true,                 \
 681           "Carry inline depth of profile point with speculative type "      \
 682           "and give priority to profiling from lower inline depth")         \
 683                                                                             \
 684   product_pd(bool, TrapBasedRangeChecks,                                    \
 685           "Generate code for range checks that uses a cmp and trap "        \
 686           "instruction raising SIGTRAP. Used on PPC64.")                    \
 687                                                                             \
 688   develop(bool, RenumberLiveNodes, true,                                    \
 689           "Renumber live nodes")                                            \
 690 
 691 C2_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
 692 
 693 #endif // SHARE_VM_OPTO_C2_GLOBALS_HPP