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_OS_FAMILY_linux
  39 # include "c2_globals_linux.hpp"
  40 #endif
  41 #ifdef TARGET_OS_FAMILY_solaris
  42 # include "c2_globals_solaris.hpp"
  43 #endif
  44 #ifdef TARGET_OS_FAMILY_windows
  45 # include "c2_globals_windows.hpp"
  46 #endif
  47 #ifdef TARGET_OS_FAMILY_bsd
  48 # include "c2_globals_bsd.hpp"
  49 #endif
  50 
  51 //
  52 // Defines all globals flags used by the server compiler.
  53 //
  54 
  55 #define C2_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct) \
  56                                                                             \
  57   develop(bool, StressLCM, false,                                           \
  58           "Randomize instruction scheduling in LCM")                        \
  59                                                                             \
  60   develop(bool, StressGCM, false,                                           \
  61           "Randomize instruction scheduling in GCM")                        \
  62                                                                             \
  63   notproduct(intx, CompileZapFirst, 0,                                      \
  64           "If +ZapDeadCompiledLocals, "                                     \
  65           "skip this many before compiling in zap calls")                   \
  66                                                                             \
  67   notproduct(intx, CompileZapLast, -1,                                      \
  68           "If +ZapDeadCompiledLocals, "                                     \
  69           "compile this many after skipping (incl. skip count, -1 = all)")  \
  70                                                                             \
  71   notproduct(intx, ZapDeadCompiledLocalsFirst, 0,                           \
  72           "If +ZapDeadCompiledLocals, "                                     \
  73           "skip this many before really doing it")                          \
  74                                                                             \
  75   notproduct(intx, ZapDeadCompiledLocalsLast, -1,                           \
  76           "If +ZapDeadCompiledLocals, "                                     \
  77           "do this many after skipping (incl. skip count, -1 = all)")       \
  78                                                                             \
  79   develop(intx, OptoPrologueNops, 0,                                        \
  80           "Insert this many extra nop instructions "                        \
  81           "in the prologue of every nmethod")                               \
  82                                                                             \
  83   product_pd(intx, InteriorEntryAlignment,                                  \
  84           "Code alignment for interior entry points "                       \
  85           "in generated code (in bytes)")                                   \
  86                                                                             \
  87   product(intx, MaxLoopPad, (OptoLoopAlignment-1),                          \
  88           "Align a loop if padding size in bytes is less or equal to this value") \
  89                                                                             \
  90   product(intx, MaxVectorSize, 32,                                          \
  91           "Max vector size in bytes, "                                      \
  92           "actual size could be less depending on elements type")           \
  93                                                                             \
  94   product(bool, AlignVector, true,                                          \
  95           "Perform vector store/load alignment in loop")                    \
  96                                                                             \
  97   product(intx, NumberOfLoopInstrToAlign, 4,                                \
  98           "Number of first instructions in a loop to align")                \
  99                                                                             \
 100   notproduct(intx, IndexSetWatch, 0,                                        \
 101           "Trace all operations on this IndexSet (-1 means all, 0 none)")   \
 102                                                                             \
 103   develop(intx, OptoNodeListSize, 4,                                        \
 104           "Starting allocation size of Node_List data structures")          \
 105                                                                             \
 106   develop(intx, OptoBlockListSize, 8,                                       \
 107           "Starting allocation size of Block_List data structures")         \
 108                                                                             \
 109   develop(intx, OptoPeepholeAt, -1,                                         \
 110           "Apply peephole optimizations to this peephole rule")             \
 111                                                                             \
 112   notproduct(bool, PrintIdeal, false,                                       \
 113           "Print ideal graph before code generation")                       \
 114                                                                             \
 115   notproduct(bool, PrintOpto, false,                                        \
 116           "Print compiler2 attempts")                                       \
 117                                                                             \
 118   notproduct(bool, PrintOptoInlining, false,                                \
 119           "Print compiler2 inlining decisions")                             \
 120                                                                             \
 121   notproduct(bool, VerifyOpto, false,                                       \
 122           "Apply more time consuming verification during compilation")      \
 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   notproduct(bool, VerifyOptoOopOffsets, false,                             \
 131           "Check types of base addresses in field references")              \
 132                                                                             \
 133   develop(bool, IdealizedNumerics, false,                                   \
 134           "Check performance difference allowing FP "                       \
 135           "associativity and commutativity...")                             \
 136                                                                             \
 137   develop(bool, OptoBreakpoint, false,                                      \
 138           "insert breakpoint at method entry")                              \
 139                                                                             \
 140   notproduct(bool, OptoBreakpointOSR, false,                                \
 141           "insert breakpoint at osr method entry")                          \
 142                                                                             \
 143   notproduct(intx, BreakAtNode, 0,                                          \
 144           "Break at construction of this Node (either _idx or _debug_idx)") \
 145                                                                             \
 146   notproduct(bool, OptoBreakpointC2R, false,                                \
 147           "insert breakpoint at runtime stub entry")                        \
 148                                                                             \
 149   notproduct(bool, OptoNoExecute, false,                                    \
 150           "Attempt to parse and compile but do not execute generated code") \
 151                                                                             \
 152   notproduct(bool, PrintOptoStatistics, false,                              \
 153           "Print New compiler statistics")                                  \
 154                                                                             \
 155   notproduct(bool, PrintOptoAssembly, false,                                \
 156           "Print New compiler assembly output")                             \
 157                                                                             \
 158   develop_pd(bool, OptoPeephole,                                            \
 159           "Apply peephole optimizations after register allocation")         \
 160                                                                             \
 161   develop(bool, OptoRemoveUseless, true,                                    \
 162           "Remove useless nodes after parsing")                             \
 163                                                                             \
 164   notproduct(bool, PrintFrameConverterAssembly, false,                      \
 165           "Print New compiler assembly output for frame converters")        \
 166                                                                             \
 167   notproduct(bool, PrintParseStatistics, false,                             \
 168           "Print nodes, transforms and new values made per bytecode parsed")\
 169                                                                             \
 170   notproduct(bool, PrintOptoPeephole, false,                                \
 171           "Print New compiler peephole replacements")                       \
 172                                                                             \
 173   develop(bool, PrintCFGBlockFreq, false,                                   \
 174           "Print CFG block freqencies")                                     \
 175                                                                             \
 176   develop(bool, TraceOptoParse, false,                                      \
 177           "Trace bytecode parse and control-flow merge")                    \
 178                                                                             \
 179   product_pd(intx,  LoopUnrollLimit,                                        \
 180           "Unroll loop bodies with node count less than this")              \
 181                                                                             \
 182   product(intx,  LoopMaxUnroll, 16,                                         \
 183           "Maximum number of unrolls for main loop")                        \
 184                                                                             \
 185   product(intx,  LoopUnrollMin, 4,                                          \
 186           "Minimum number of unroll loop bodies before checking progress"   \
 187           "of rounds of unroll,optimize,..")                                \
 188                                                                             \
 189   develop(intx, UnrollLimitForProfileCheck, 1,                              \
 190           "Don't use profile_trip_cnt() to restrict unrolling until "       \
 191           "unrolling would push the number of unrolled iterations above "   \
 192           "UnrollLimitForProfileCheck. A higher value allows more "         \
 193           "unrolling. Zero acts as a very large value." )                   \
 194                                                                             \
 195   product(intx, MultiArrayExpandLimit, 6,                                   \
 196           "Maximum number of individual allocations in an inline-expanded " \
 197           "multianewarray instruction")                                     \
 198                                                                             \
 199   notproduct(bool, TraceProfileTripCount, false,                            \
 200           "Trace profile loop trip count information")                      \
 201                                                                             \
 202   product(bool, UseLoopPredicate, true,                                     \
 203           "Generate a predicate to select fast/slow loop versions")         \
 204                                                                             \
 205   develop(bool, TraceLoopPredicate, false,                                  \
 206           "Trace generation of loop predicates")                            \
 207                                                                             \
 208   develop(bool, TraceLoopOpts, false,                                       \
 209           "Trace executed loop optimizations")                              \
 210                                                                             \
 211   diagnostic(bool, LoopLimitCheck, true,                                    \
 212           "Generate a loop limits check for overflow")                      \
 213                                                                             \
 214   develop(bool, TraceLoopLimitCheck, false,                                 \
 215           "Trace generation of loop limits checks")                         \
 216                                                                             \
 217   diagnostic(bool, RangeLimitCheck, true,                                   \
 218           "Additional overflow checks during range check elimination")      \
 219                                                                             \
 220   develop(bool, TraceRangeLimitCheck, false,                                \
 221           "Trace additional overflow checks in RCE")                        \
 222                                                                             \
 223   diagnostic(bool, UnrollLimitCheck, true,                                  \
 224           "Additional overflow checks during loop unroll")                  \
 225                                                                             \
 226   product(bool, OptimizeFill, true,                                         \
 227           "convert fill/copy loops into intrinsic")                         \
 228                                                                             \
 229   develop(bool, TraceOptimizeFill, false,                                   \
 230           "print detailed information about fill conversion")               \
 231                                                                             \
 232   develop(bool, OptoCoalesce, true,                                         \
 233           "Use Conservative Copy Coalescing in the Register Allocator")     \
 234                                                                             \
 235   develop(bool, UseUniqueSubclasses, true,                                  \
 236           "Narrow an abstract reference to the unique concrete subclass")   \
 237                                                                             \
 238   develop(bool, UseExactTypes, true,                                        \
 239           "Use exact types to eliminate array store checks and v-calls")    \
 240                                                                             \
 241   product(intx, TrackedInitializationLimit, 50,                             \
 242           "When initializing fields, track up to this many words")          \
 243                                                                             \
 244   product(bool, ReduceFieldZeroing, true,                                   \
 245           "When initializing fields, try to avoid needless zeroing")        \
 246                                                                             \
 247   product(bool, ReduceInitialCardMarks, true,                               \
 248           "When initializing fields, try to avoid needless card marks")     \
 249                                                                             \
 250   product(bool, ReduceBulkZeroing, true,                                    \
 251           "When bulk-initializing, try to avoid needless zeroing")          \
 252                                                                             \
 253   product(bool, UseFPUForSpilling, false,                                   \
 254           "Spill integer registers to FPU instead of stack when possible")  \
 255                                                                             \
 256   develop_pd(intx, RegisterCostAreaRatio,                                   \
 257           "Spill selection in reg allocator: scale area by (X/64K) before " \
 258           "adding cost")                                                    \
 259                                                                             \
 260   develop_pd(bool, UseCISCSpill,                                            \
 261           "Use ADLC supplied cisc instructions during allocation")          \
 262                                                                             \
 263   notproduct(bool, VerifyGraphEdges , false,                                \
 264           "Verify Bi-directional Edges")                                    \
 265                                                                             \
 266   notproduct(bool, VerifyDUIterators, true,                                 \
 267           "Verify the safety of all iterations of Bi-directional Edges")    \
 268                                                                             \
 269   notproduct(bool, VerifyHashTableKeys, true,                               \
 270           "Verify the immutability of keys in the VN hash tables")          \
 271                                                                             \
 272   notproduct(bool, VerifyRegisterAllocator , false,                         \
 273           "Verify Register Allocator")                                      \
 274                                                                             \
 275   develop_pd(intx, FLOATPRESSURE,                                           \
 276           "Number of float LRG's that constitute high register pressure")   \
 277                                                                             \
 278   develop_pd(intx, INTPRESSURE,                                             \
 279           "Number of integer LRG's that constitute high register pressure") \
 280                                                                             \
 281   notproduct(bool, TraceOptoPipelining, false,                              \
 282           "Trace pipelining information")                                   \
 283                                                                             \
 284   notproduct(bool, TraceOptoOutput, false,                                  \
 285           "Trace pipelining information")                                   \
 286                                                                             \
 287   product_pd(bool, OptoScheduling,                                          \
 288           "Instruction Scheduling after register allocation")               \
 289                                                                             \
 290   product(bool, PartialPeelLoop, true,                                      \
 291           "Partial peel (rotate) loops")                                    \
 292                                                                             \
 293   product(intx, PartialPeelNewPhiDelta, 0,                                  \
 294           "Additional phis that can be created by partial peeling")         \
 295                                                                             \
 296   notproduct(bool, TracePartialPeeling, false,                              \
 297           "Trace partial peeling (loop rotation) information")              \
 298                                                                             \
 299   product(bool, PartialPeelAtUnsignedTests, true,                           \
 300           "Partial peel at unsigned tests if no signed test exists")        \
 301                                                                             \
 302   product(bool, ReassociateInvariants, true,                                \
 303           "Enable reassociation of expressions with loop invariants.")      \
 304                                                                             \
 305   product(bool, LoopUnswitching, true,                                      \
 306           "Enable loop unswitching (a form of invariant test hoisting)")    \
 307                                                                             \
 308   notproduct(bool, TraceLoopUnswitching, false,                             \
 309           "Trace loop unswitching")                                         \
 310                                                                             \
 311   product(bool, UseSuperWord, true,                                         \
 312           "Transform scalar operations into superword operations")          \
 313                                                                             \
 314   develop(bool, SuperWordRTDepCheck, false,                                 \
 315           "Enable runtime dependency checks.")                              \
 316                                                                             \
 317   notproduct(bool, TraceSuperWord, false,                                   \
 318           "Trace superword transforms")                                     \
 319                                                                             \
 320   notproduct(bool, TraceNewVectors, false,                                  \
 321           "Trace creation of Vector nodes")                                 \
 322                                                                             \
 323   product_pd(bool, OptoBundling,                                            \
 324           "Generate nops to fill i-cache lines")                            \
 325                                                                             \
 326   product_pd(intx, ConditionalMoveLimit,                                    \
 327           "Limit of ops to make speculative when using CMOVE")              \
 328                                                                             \
 329   /* Set BranchOnRegister == false. See 4965987. */                         \
 330   product(bool, BranchOnRegister, false,                                    \
 331           "Use Sparc V9 branch-on-register opcodes")                        \
 332                                                                             \
 333   develop(bool, SparcV9RegsHiBitsZero, true,                                \
 334           "Assume Sparc V9 I&L registers on V8+ systems are zero-extended") \
 335                                                                             \
 336   product(bool, UseRDPCForConstantTableBase, false,                         \
 337           "Use Sparc RDPC instruction for the constant table base.")        \
 338                                                                             \
 339   develop(intx, PrintIdealGraphLevel, 0,                                    \
 340           "Print ideal graph to XML file / network interface. "             \
 341           "By default attempts to connect to the visualizer on a socket.")  \
 342                                                                             \
 343   develop(intx, PrintIdealGraphPort, 4444,                                  \
 344           "Ideal graph printer to network port")                            \
 345                                                                             \
 346   notproduct(ccstr, PrintIdealGraphAddress, "127.0.0.1",                    \
 347           "IP address to connect to visualizer")                            \
 348                                                                             \
 349   notproduct(ccstr, PrintIdealGraphFile, NULL,                              \
 350           "File to dump ideal graph to.  If set overrides the "             \
 351           "use of the network")                                             \
 352                                                                             \
 353   product(bool, UseBimorphicInlining, true,                                 \
 354           "Profiling based inlining for two receivers")                     \
 355                                                                             \
 356   product(bool, UseOnlyInlinedBimorphic, true,                              \
 357           "Don't use BimorphicInlining if can't inline a second method")    \
 358                                                                             \
 359   product(bool, InsertMemBarAfterArraycopy, true,                           \
 360           "Insert memory barrier after arraycopy call")                     \
 361                                                                             \
 362   develop(bool, SubsumeLoads, true,                                         \
 363           "Attempt to compile while subsuming loads into machine instructions.") \
 364                                                                             \
 365   develop(bool, StressRecompilation, false,                                 \
 366           "Recompile each compiled method without subsuming loads or escape analysis.") \
 367                                                                             \
 368   develop(intx, ImplicitNullCheckThreshold, 3,                              \
 369           "Don't do implicit null checks if NPE's in a method exceeds limit") \
 370                                                                             \
 371   product(intx, LoopOptsCount, 43,                                          \
 372           "Set level of loop optimization for tier 1 compiles")             \
 373                                                                             \
 374   /* controls for heat-based inlining */                                    \
 375                                                                             \
 376   develop(intx, NodeCountInliningCutoff, 18000,                             \
 377           "If parser node generation exceeds limit stop inlining")          \
 378                                                                             \
 379   develop(intx, NodeCountInliningStep, 1000,                                \
 380           "Target size of warm calls inlined between optimization passes")  \
 381                                                                             \
 382   develop(bool, InlineWarmCalls, false,                                     \
 383           "Use a heat-based priority queue to govern inlining")             \
 384                                                                             \
 385   develop(intx, HotCallCountThreshold, 999999,                              \
 386           "large numbers of calls (per method invocation) force hotness")   \
 387                                                                             \
 388   develop(intx, HotCallProfitThreshold, 999999,                             \
 389           "highly profitable inlining opportunities force hotness")         \
 390                                                                             \
 391   develop(intx, HotCallTrivialWork, -1,                                     \
 392           "trivial execution time (no larger than this) forces hotness")    \
 393                                                                             \
 394   develop(intx, HotCallTrivialSize, -1,                                     \
 395           "trivial methods (no larger than this) force calls to be hot")    \
 396                                                                             \
 397   develop(intx, WarmCallMinCount, -1,                                       \
 398           "number of calls (per method invocation) to enable inlining")     \
 399                                                                             \
 400   develop(intx, WarmCallMinProfit, -1,                                      \
 401           "number of calls (per method invocation) to enable inlining")     \
 402                                                                             \
 403   develop(intx, WarmCallMaxWork, 999999,                                    \
 404           "execution time of the largest inlinable method")                 \
 405                                                                             \
 406   develop(intx, WarmCallMaxSize, 999999,                                    \
 407           "size of the largest inlinable method")                           \
 408                                                                             \
 409   product(intx, MaxNodeLimit, 80000,                                        \
 410           "Maximum number of nodes")                                        \
 411                                                                             \
 412   product(intx, NodeLimitFudgeFactor, 2000,                                 \
 413           "Fudge Factor for certain optimizations")                         \
 414                                                                             \
 415   product(bool, UseJumpTables, true,                                        \
 416           "Use JumpTables instead of a binary search tree for switches")    \
 417                                                                             \
 418   product(bool, UseDivMod, true,                                            \
 419           "Use combined DivMod instruction if available")                   \
 420                                                                             \
 421   product_pd(intx, MinJumpTableSize,                                        \
 422           "Minimum number of targets in a generated jump table")            \
 423                                                                             \
 424   product(intx, MaxJumpTableSize, 65000,                                    \
 425           "Maximum number of targets in a generated jump table")            \
 426                                                                             \
 427   product(intx, MaxJumpTableSparseness, 5,                                  \
 428           "Maximum sparseness for jumptables")                              \
 429                                                                             \
 430   product(bool, EliminateLocks, true,                                       \
 431           "Coarsen locks when possible")                                    \
 432                                                                             \
 433   product(bool, EliminateNestedLocks, true,                                 \
 434           "Eliminate nested locks of the same object when possible")        \
 435                                                                             \
 436   notproduct(bool, PrintLockStatistics, false,                              \
 437           "Print precise statistics on the dynamic lock usage")             \
 438                                                                             \
 439   diagnostic(bool, PrintPreciseBiasedLockingStatistics, false,              \
 440           "Print per-lock-site statistics of biased locking in JVM")        \
 441                                                                             \
 442   notproduct(bool, PrintEliminateLocks, false,                              \
 443           "Print out when locks are eliminated")                            \
 444                                                                             \
 445   product(bool, EliminateAutoBox, true,                                     \
 446           "Control optimizations for autobox elimination")                  \
 447                                                                             \
 448   experimental(bool, UseImplicitStableValues, false,                        \
 449           "Mark well-known stable fields as such (e.g. String.value)")      \
 450                                                                             \
 451   product(intx, AutoBoxCacheMax, 128,                                       \
 452           "Sets max value cached by the java.lang.Integer autobox cache")   \
 453                                                                             \
 454   experimental(bool, AggressiveUnboxing, false,                             \
 455           "Control optimizations for aggressive boxing elimination")        \
 456                                                                             \
 457   product(bool, DoEscapeAnalysis, true,                                     \
 458           "Perform escape analysis")                                        \
 459                                                                             \
 460   develop(bool, ExitEscapeAnalysisOnTimeout, true,                          \
 461           "Exit or throw assert in EA when it reaches time limit")          \
 462                                                                             \
 463   notproduct(bool, PrintEscapeAnalysis, false,                              \
 464           "Print the results of escape analysis")                           \
 465                                                                             \
 466   product(bool, EliminateAllocations, true,                                 \
 467           "Use escape analysis to eliminate allocations")                   \
 468                                                                             \
 469   notproduct(bool, PrintEliminateAllocations, false,                        \
 470           "Print out when allocations are eliminated")                      \
 471                                                                             \
 472   product(intx, EliminateAllocationArraySizeLimit, 64,                      \
 473           "Array size (number of elements) limit for scalar replacement")   \
 474                                                                             \
 475   product(bool, OptimizePtrCompare, true,                                   \
 476           "Use escape analysis to optimize pointers compare")               \
 477                                                                             \
 478   notproduct(bool, PrintOptimizePtrCompare, false,                          \
 479           "Print information about optimized pointers compare")             \
 480                                                                             \
 481   notproduct(bool, VerifyConnectionGraph , true,                            \
 482           "Verify Connection Graph construction in Escape Analysis")        \
 483                                                                             \
 484   product(bool, UseOptoBiasInlining, true,                                  \
 485           "Generate biased locking code in C2 ideal graph")                 \
 486                                                                             \
 487   product(bool, OptimizeStringConcat, true,                                 \
 488           "Optimize the construction of Strings by StringBuilder")          \
 489                                                                             \
 490   notproduct(bool, PrintOptimizeStringConcat, false,                        \
 491           "Print information about transformations performed on Strings")   \
 492                                                                             \
 493   product(intx, ValueSearchLimit, 1000,                                     \
 494           "Recursion limit in PhaseMacroExpand::value_from_mem_phi")        \
 495                                                                             \
 496   product(intx, MaxLabelRootDepth, 1100,                                    \
 497           "Maximum times call Label_Root to prevent stack overflow")        \
 498                                                                             \
 499   diagnostic(intx, DominatorSearchLimit, 1000,                              \
 500           "Iterations limit in Node::dominates")                            \
 501                                                                             \
 502   product(bool, BlockLayoutByFrequency, true,                               \
 503           "Use edge frequencies to drive block ordering")                   \
 504                                                                             \
 505   product(intx, BlockLayoutMinDiamondPercentage, 20,                        \
 506           "Miniumum %% of a successor (predecessor) for which block layout "\
 507           "a will allow a fork (join) in a single chain")                   \
 508                                                                             \
 509   product(bool, BlockLayoutRotateLoops, true,                               \
 510           "Allow back branches to be fall throughs in the block layour")    \
 511                                                                             \
 512   develop(bool, InlineReflectionGetCallerClass, true,                       \
 513           "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
 514           "of base library DLL")                                            \
 515                                                                             \
 516   develop(bool, InlineObjectCopy, true,                                     \
 517           "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
 518                                                                             \
 519   develop(bool, SpecialStringCompareTo, true,                               \
 520           "special version of string compareTo")                            \
 521                                                                             \
 522   develop(bool, SpecialStringIndexOf, true,                                 \
 523           "special version of string indexOf")                              \
 524                                                                             \
 525   develop(bool, SpecialStringEquals, true,                                  \
 526           "special version of string equals")                               \
 527                                                                             \
 528   develop(bool, SpecialArraysEquals, true,                                  \
 529           "special version of Arrays.equals(char[],char[])")                \
 530                                                                             \
 531   product(bool, SpecialEncodeISOArray, true,                                \
 532           "special version of ISO_8859_1$Encoder.encodeISOArray")           \
 533                                                                             \
 534   develop(bool, BailoutToInterpreterForThrows, false,                       \
 535           "Compiled methods which throws/catches exceptions will be "       \
 536           "deopt and intp.")                                                \
 537                                                                             \
 538   develop(bool, ConvertCmpD2CmpF, true,                                     \
 539           "Convert cmpD to cmpF when one input is constant in float range") \
 540                                                                             \
 541   develop(bool, ConvertFloat2IntClipping, true,                             \
 542           "Convert float2int clipping idiom to integer clipping")           \
 543                                                                             \
 544   develop(bool, Use24BitFPMode, true,                                       \
 545           "Set 24-bit FPU mode on a per-compile basis ")                    \
 546                                                                             \
 547   develop(bool, Use24BitFP, true,                                           \
 548           "use FP instructions that produce 24-bit precise results")        \
 549                                                                             \
 550   develop(bool, MonomorphicArrayCheck, true,                                \
 551           "Uncommon-trap array store checks that require full type check")  \
 552                                                                             \
 553   notproduct(bool, TracePhaseCCP, false,                                    \
 554           "Print progress during Conditional Constant Propagation")         \
 555                                                                             \
 556   develop(bool, PrintDominators, false,                                     \
 557           "Print out dominator trees for GVN")                              \
 558                                                                             \
 559   notproduct(bool, TraceSpilling, false,                                    \
 560           "Trace spilling")                                                 \
 561                                                                             \
 562   diagnostic(bool, TraceTypeProfile, false,                                 \
 563           "Trace type profile")                                             \
 564                                                                             \
 565   develop(bool, PoisonOSREntry, true,                                       \
 566            "Detect abnormal calls to OSR code")                             \
 567                                                                             \
 568   product(bool, UseCondCardMark, false,                                     \
 569           "Check for already marked card before updating card table")       \
 570                                                                             \
 571   develop(bool, SoftMatchFailure, trueInProduct,                            \
 572           "If the DFA fails to match a node, print a message and bail out") \
 573                                                                             \
 574   develop(bool, InlineAccessors, true,                                      \
 575           "inline accessor methods (get/set)")                              \
 576                                                                             \
 577   product(intx, TypeProfileMajorReceiverPercent, 90,                        \
 578           "% of major receiver type to all profiled receivers")             \
 579                                                                             \
 580   notproduct(bool, TimeCompiler2, false,                                    \
 581           "detailed time the compiler (requires +TimeCompiler)")            \
 582                                                                             \
 583   diagnostic(bool, PrintIntrinsics, false,                                  \
 584           "prints attempted and successful inlining of intrinsics")         \
 585                                                                             \
 586   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 587           "do not expand intrinsics whose (internal) names appear here")    \
 588                                                                             \
 589   develop(bool, StressReflectiveCode, false,                                \
 590           "Use inexact types at allocations, etc., to test reflection")     \
 591                                                                             \
 592   diagnostic(bool, DebugInlinedCalls, true,                                 \
 593          "If false, restricts profiled locations to the root method only")  \
 594                                                                             \
 595   notproduct(bool, VerifyLoopOptimizations, false,                          \
 596           "verify major loop optimizations")                                \
 597                                                                             \
 598   diagnostic(bool, ProfileDynamicTypes, true,                               \
 599           "do extra type profiling and use it more aggressively")           \
 600                                                                             \
 601   develop(bool, TraceIterativeGVN, false,                                   \
 602           "Print progress during Iterative Global Value Numbering")         \
 603                                                                             \
 604   develop(bool, VerifyIterativeGVN, false,                                  \
 605           "Verify Def-Use modifications during sparse Iterative Global "    \
 606           "Value Numbering")                                                \
 607                                                                             \
 608   notproduct(bool, TraceCISCSpill, false,                                   \
 609           "Trace allocators use of cisc spillable instructions")            \
 610                                                                             \
 611   product(bool, SplitIfBlocks, true,                                        \
 612           "Clone compares and control flow through merge points to fold "   \
 613           "some branches")                                                  \
 614                                                                             \
 615   develop(intx, FreqCountInvocations,  1,                                   \
 616           "Scaling factor for branch frequencies (deprecated)")             \
 617                                                                             \
 618   product(intx, AliasLevel,     3,                                          \
 619           "0 for no aliasing, 1 for oop/field/static/array split, "         \
 620           "2 for class split, 3 for unique instances")                      \
 621                                                                             \
 622   develop(bool, VerifyAliases, false,                                       \
 623           "perform extra checks on the results of alias analysis")          \
 624                                                                             \
 625   product(bool, IncrementalInline, true,                                    \
 626           "do post parse inlining")                                         \
 627                                                                             \
 628   develop(bool, AlwaysIncrementalInline, false,                             \
 629           "do all inlining incrementally")                                  \
 630                                                                             \
 631   product(intx, LiveNodeCountInliningCutoff, 20000,                         \
 632           "max number of live nodes in a method")                           \
 633                                                                             \
 634   diagnostic(bool, OptimizeExpensiveOps, true,                              \
 635           "Find best control for expensive operations")                     \
 636                                                                             \
 637   experimental(bool, UseMathExactIntrinsics, false,                         \
 638           "Enables intrinsification of various java.lang.Math functions")   \
 639                                                                             \
 640   experimental(bool, ReplaceInParentMaps, false,                            \
 641           "Propagate type improvements in callers of inlinee if possible")  \
 642                                                                             \
 643   experimental(bool, UseTypeSpeculation, false,                             \
 644           "Speculatively propagate types from profiles")
 645 
 646 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)
 647 
 648 #endif // SHARE_VM_OPTO_C2_GLOBALS_HPP