1; Parameter options of the compiler. 2 3; Copyright (C) 2019-2022 Free Software Foundation, Inc. 4; 5; This file is part of GCC. 6; 7; GCC is free software; you can redistribute it and/or modify it under 8; the terms of the GNU General Public License as published by the Free 9; Software Foundation; either version 3, or (at your option) any later 10; version. 11; 12; GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13; WARRANTY; without even the implied warranty of MERCHANTABILITY or 14; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15; for more details. 16; 17; You should have received a copy of the GNU General Public License 18; along with GCC; see the file COPYING3. If not see 19; <http://www.gnu.org/licenses/>. 20 21; See the GCC internals manual (options.texi) for a description of this file's format. 22 23; Please try to keep this file in ASCII collating order. 24 25-param=align-loop-iterations= 26Common Joined UInteger Var(param_align_loop_iterations) Init(4) Param Optimization 27Loops iterating at least selected number of iterations will get loop alignment. 28 29-param=align-threshold= 30Common Joined UInteger Var(param_align_threshold) Init(100) IntegerRange(1, 65536) Param Optimization 31Select fraction of the maximal frequency of executions of basic block in function given basic block get alignment. 32 33-param=asan-globals= 34Common Joined UInteger Var(param_asan_globals) Init(1) IntegerRange(0, 1) Param 35Enable asan globals protection. 36 37-param=asan-instrument-allocas= 38Common Joined UInteger Var(param_asan_protect_allocas) Init(1) IntegerRange(0, 1) Param Optimization 39Enable asan allocas/VLAs protection. 40 41-param=asan-instrument-reads= 42Common Joined UInteger Var(param_asan_instrument_reads) Init(1) IntegerRange(0, 1) Param Optimization 43Enable asan load operations protection. 44 45-param=asan-instrument-writes= 46Common Joined UInteger Var(param_asan_instrument_writes) Init(1) IntegerRange(0, 1) Param Optimization 47Enable asan store operations protection. 48 49-param=asan-instrumentation-with-call-threshold= 50Common Joined UInteger Var(param_asan_instrumentation_with_call_threshold) Init(7000) Param Optimization 51Use callbacks instead of inline code if number of accesses in function becomes greater or equal to this number. 52 53-param=asan-memintrin= 54Common Joined UInteger Var(param_asan_memintrin) Init(1) IntegerRange(0, 1) Param Optimization 55Enable asan builtin functions protection. 56 57-param=asan-stack= 58Common Joined UInteger Var(param_asan_stack) Init(1) IntegerRange(0, 1) Param Optimization 59Enable asan stack protection. 60 61-param=asan-use-after-return= 62Common Joined UInteger Var(param_asan_use_after_return) Init(1) IntegerRange(0, 1) Param Optimization 63Enable asan detection of use-after-return bugs. 64 65-param=hwasan-instrument-stack= 66Common Joined UInteger Var(param_hwasan_instrument_stack) Init(1) IntegerRange(0, 1) Param Optimization 67Enable hwasan instrumentation of statically sized stack-allocated variables. 68 69-param=hwasan-random-frame-tag= 70Common Joined UInteger Var(param_hwasan_random_frame_tag) Init(1) IntegerRange(0, 1) Param Optimization 71Use random base tag for each frame, as opposed to base always zero. 72 73-param=hwasan-instrument-allocas= 74Common Joined UInteger Var(param_hwasan_instrument_allocas) Init(1) IntegerRange(0, 1) Param Optimization 75Enable hwasan instrumentation of allocas/VLAs. 76 77-param=hwasan-instrument-reads= 78Common Joined UInteger Var(param_hwasan_instrument_reads) Init(1) IntegerRange(0, 1) Param Optimization 79Enable hwasan instrumentation of load operations. 80 81-param=hwasan-instrument-writes= 82Common Joined UInteger Var(param_hwasan_instrument_writes) Init(1) IntegerRange(0, 1) Param Optimization 83Enable hwasan instrumentation of store operations. 84 85-param=hwasan-instrument-mem-intrinsics= 86Common Joined UInteger Var(param_hwasan_instrument_mem_intrinsics) Init(1) IntegerRange(0, 1) Param Optimization 87Enable hwasan instrumentation of builtin functions. 88 89-param=avg-loop-niter= 90Common Joined UInteger Var(param_avg_loop_niter) Init(10) IntegerRange(1, 65536) Param Optimization 91Average number of iterations of a loop. 92 93-param=avoid-fma-max-bits= 94Common Joined UInteger Var(param_avoid_fma_max_bits) IntegerRange(0, 512) Param Optimization 95Maximum number of bits for which we avoid creating FMAs. 96 97-param=builtin-expect-probability= 98Common Joined UInteger Var(param_builtin_expect_probability) Init(90) IntegerRange(0, 100) Param Optimization 99Set the estimated probability in percentage for builtin expect. The default value is 90% probability. 100 101-param=builtin-string-cmp-inline-length= 102Common Joined UInteger Var(param_builtin_string_cmp_inline_length) Init(3) IntegerRange(0, 100) Param Optimization 103The maximum length of a constant string for a builtin string cmp call eligible for inlining. The default value is 3. 104 105-param=case-values-threshold= 106Common Joined UInteger Var(param_case_values_threshold) Param Optimization 107The smallest number of different values for which it is best to use a jump-table instead of a tree of conditional branches, if 0, use the default for the machine. 108 109-param=comdat-sharing-probability= 110Common Joined UInteger Var(param_comdat_sharing_probability) Init(20) Param Optimization 111Probability that COMDAT function will be shared with different compilation unit. 112 113-param=cxx-max-namespaces-for-diagnostic-help= 114Common Joined UInteger Var(param_cxx_max_namespaces_for_diagnostic_help) Init(1000) Param 115Maximum number of namespaces to search for alternatives when name lookup fails. 116 117-param=dse-max-alias-queries-per-store= 118Common Joined UInteger Var(param_dse_max_alias_queries_per_store) Init(256) Param Optimization 119Maximum number of queries into the alias oracle per store. 120 121-param=dse-max-object-size= 122Common Joined UInteger Var(param_dse_max_object_size) Init(256) Param Optimization 123Maximum size (in bytes) of objects tracked bytewise by dead store elimination. 124 125-param=early-inlining-insns= 126Common Joined UInteger Var(param_early_inlining_insns) Init(6) Optimization Param 127Maximal estimated growth of function body caused by early inlining of single call. 128 129-param=evrp-sparse-threshold= 130Common Joined UInteger Var(param_evrp_sparse_threshold) Init(800) Optimization Param 131Maximum number of basic blocks before EVRP uses a sparse cache. 132 133-param=evrp-switch-limit= 134Common Joined UInteger Var(param_evrp_switch_limit) Init(50) Optimization Param 135Maximum number of outgoing edges in a switch before EVRP will not process it. 136 137-param=evrp-mode= 138Common Joined Var(param_evrp_mode) Enum(evrp_mode) Init(EVRP_MODE_RVRP_ONLY) Param Optimization 139--param=evrp-mode=[legacy|ranger|legacy-first|ranger-first] Specifies the mode Early VRP should operate in. 140 141Enum 142Name(evrp_mode) Type(enum evrp_mode) UnknownError(unknown evrp mode %qs) 143 144EnumValue 145Enum(evrp_mode) String(legacy) Value(EVRP_MODE_EVRP_ONLY) 146 147EnumValue 148Enum(evrp_mode) String(ranger) Value(EVRP_MODE_RVRP_ONLY) 149 150EnumValue 151Enum(evrp_mode) String(legacy-first) Value(EVRP_MODE_EVRP_FIRST) 152 153EnumValue 154Enum(evrp_mode) String(ranger-first) Value(EVRP_MODE_RVRP_FIRST) 155 156-param=fsm-scale-path-blocks= 157Common Joined UInteger Var(param_fsm_scale_path_blocks) Init(3) IntegerRange(1, 10) Param Optimization 158Scale factor to apply to the number of blocks in a threading path when comparing to the number of (scaled) statements. 159 160-param=fsm-scale-path-stmts= 161Common Joined UInteger Var(param_fsm_scale_path_stmts) Init(2) IntegerRange(1, 10) Param Optimization 162Scale factor to apply to the number of statements in a threading path when comparing to the number of (scaled) blocks. 163 164-param=gcse-after-reload-critical-fraction= 165Common Joined UInteger Var(param_gcse_after_reload_critical_fraction) Init(10) Param Optimization 166The threshold ratio of critical edges execution count that permit performing redundancy elimination after reload. 167 168-param=gcse-after-reload-partial-fraction= 169Common Joined UInteger Var(param_gcse_after_reload_partial_fraction) Init(3) Param Optimization 170The threshold ratio for performing partial redundancy elimination after reload. 171 172-param=gcse-cost-distance-ratio= 173Common Joined UInteger Var(param_gcse_cost_distance_ratio) Init(10) Param Optimization 174Scaling factor in calculation of maximum distance an expression can be moved by GCSE optimizations. 175 176-param=gcse-unrestricted-cost= 177Common Joined UInteger Var(param_gcse_unrestricted_cost) Init(3) Param Optimization 178Cost at which GCSE optimizations will not constraint the distance an expression can travel. 179 180-param=ggc-min-expand= 181Common Joined UInteger Var(param_ggc_min_expand) Init(30) Param 182Minimum heap expansion to trigger garbage collection, as a percentage of the total size of the heap. 183 184-param=ggc-min-heapsize= 185Common Joined UInteger Var(param_ggc_min_heapsize) Init(4096) Param 186Minimum heap size before we start collecting garbage, in kilobytes. 187 188-param=gimple-fe-computed-hot-bb-threshold= 189Common Joined UInteger Var(param_gimple_fe_computed_hot_bb_threshold) Param 190The number of executions of a basic block which is considered hot. The parameter is used only in GIMPLE FE. 191 192-param=graphite-allow-codegen-errors= 193Common Joined UInteger Var(param_graphite_allow_codegen_errors) IntegerRange(0, 1) Param 194Whether codegen errors should be ICEs when -fchecking. 195 196-param=graphite-max-arrays-per-scop= 197Common Joined UInteger Var(param_graphite_max_arrays_per_scop) Init(100) Param Optimization 198Maximum number of arrays per SCoP. 199 200-param=graphite-max-nb-scop-params= 201Common Joined UInteger Var(param_graphite_max_nb_scop_params) Init(10) Param Optimization 202Maximum number of parameters in a SCoP. 203 204-param=hash-table-verification-limit= 205Common Joined UInteger Var(param_hash_table_verification_limit) Init(10) Param 206The number of elements for which hash table verification is done for each searched element. 207 208-param=hot-bb-count-fraction= 209Common Joined UInteger Var(param_hot_bb_count_fraction) Init(10000) Param 210The denominator n of fraction 1/n of the maximal execution count of a basic block in the entire program that a basic block needs to at least have in order to be considered hot (used in non-LTO mode). 211 212-param=hot-bb-count-ws-permille= 213Common Joined UInteger Var(param_hot_bb_count_ws_permille) Init(990) IntegerRange(0, 1000) Param 214The number of most executed permilles of the profiled execution of the entire program to which the execution count of a basic block must be part of in order to be considered hot (used in LTO mode). 215 216-param=hot-bb-frequency-fraction= 217Common Joined UInteger Var(param_hot_bb_frequency_fraction) Init(1000) Param 218The denominator n of fraction 1/n of the execution frequency of the entry block of a function that a basic block of this function needs to at least have in order to be considered hot. 219 220-param=inline-heuristics-hint-percent= 221Common Joined UInteger Var(param_inline_heuristics_hint_percent) Init(200) Optimization IntegerRange(100, 1000000) Param 222The scale (in percents) applied to inline-insns-single and auto limits when heuristics hints that inlining is very profitable. 223 224-param=inline-min-speedup= 225Common Joined UInteger Var(param_inline_min_speedup) Init(30) Optimization IntegerRange(0, 100) Param 226The minimal estimated speedup allowing inliner to ignore inline-insns-single and inline-insns-auto. 227 228-param=inline-unit-growth= 229Common Joined UInteger Var(param_inline_unit_growth) Init(40) Optimization Param 230How much can given compilation unit grow because of the inlining (in percent). 231 232-param=integer-share-limit= 233Common Joined UInteger Var(param_integer_share_limit) Init(251) IntegerRange(2, 65536) Param 234The upper bound for sharing integer constants. 235 236-param=ipa-cp-eval-threshold= 237Common Joined UInteger Var(param_ipa_cp_eval_threshold) Init(500) Param Optimization 238Threshold ipa-cp opportunity evaluation that is still considered beneficial to clone. 239 240-param=ipa-cp-loop-hint-bonus= 241Common Joined UInteger Var(param_ipa_cp_loop_hint_bonus) Init(64) Param Optimization 242Compile-time bonus IPA-CP assigns to candidates which make loop bounds or strides known. 243 244-param=ipa-cp-max-recursive-depth= 245Common Joined UInteger Var(param_ipa_cp_max_recursive_depth) Init(8) Param Optimization 246Maximum depth of recursive cloning for self-recursive function. 247 248-param=ipa-cp-min-recursive-probability= 249Common Joined UInteger Var(param_ipa_cp_min_recursive_probability) Init(2) Param Optimization 250Recursive cloning only when the probability of call being executed exceeds the parameter. 251 252-param=ipa-cp-recursive-freq-factor= 253Common Joined UInteger Var(param_ipa_cp_recursive_freq_factor) Init(6) Param Optimization 254When propagating IPA-CP effect estimates, multiply frequencies of recursive edges that bring back an unchanged value by this factor. 255 256-param=ipa-cp-recursion-penalty= 257Common Joined UInteger Var(param_ipa_cp_recursion_penalty) Init(40) IntegerRange(0, 100) Param Optimization 258Percentage penalty the recursive functions will receive when they are evaluated for cloning. 259 260-param=ipa-cp-single-call-penalty= 261Common Joined UInteger Var(param_ipa_cp_single_call_penalty) Init(15) IntegerRange(0, 100) Param Optimization 262Percentage penalty functions containing a single call to another function will receive when they are evaluated for cloning. 263 264-param=ipa-cp-unit-growth= 265Common Joined UInteger Var(param_ipa_cp_unit_growth) Init(10) Param Optimization 266How much can given compilation unit grow because of the interprocedural constant propagation (in percent). 267 268-param=ipa-cp-large-unit-insns= 269Common Joined UInteger Var(param_ipa_cp_large_unit_insns) Optimization Init(16000) Param 270The size of translation unit that IPA-CP pass considers large. 271 272-param=ipa-cp-value-list-size= 273Common Joined UInteger Var(param_ipa_cp_value_list_size) Init(8) Param Optimization 274Maximum size of a list of values associated with each parameter for interprocedural constant propagation. 275 276-param=ipa-cp-profile-count-base= 277Common Joined UInteger Var(param_ipa_cp_profile_count_base) Init(10) IntegerRange(0, 100) Param Optimization 278When using profile feedback, use the edge at this percentage position in frequncy histogram as the bases for IPA-CP heuristics. 279 280-param=ipa-jump-function-lookups= 281Common Joined UInteger Var(param_ipa_jump_function_lookups) Init(8) Param Optimization 282Maximum number of statements visited during jump function offset discovery. 283 284-param=ipa-max-aa-steps= 285Common Joined UInteger Var(param_ipa_max_aa_steps) Init(25000) Param Optimization 286Maximum number of statements that will be visited by IPA formal parameter analysis based on alias analysis in any given function. 287 288-param=ipa-max-agg-items= 289Common Joined UInteger Var(param_ipa_max_agg_items) Init(16) Param Optimization 290Maximum number of aggregate content items for a parameter in jump functions and lattices. 291 292-param=ipa-max-param-expr-ops= 293Common Joined UInteger Var(param_ipa_max_param_expr_ops) Init(10) Param Optimization 294Maximum number of operations in a parameter expression that can be handled by IPA analysis. 295 296-param=ipa-max-loop-predicates= 297Common Joined UInteger Var(param_ipa_max_loop_predicates) Init(16) Param Optimization 298Maximum number of different predicates used to track properties of loops in IPA analysis. 299 300-param=ipa-max-switch-predicate-bounds= 301Common Joined UInteger Var(param_ipa_max_switch_predicate_bounds) Init(5) Param Optimization 302Maximal number of boundary endpoints of case ranges of switch statement used during IPA function summary generation. 303 304-param=ipa-sra-max-replacements= 305Common Joined UInteger Var(param_ipa_sra_max_replacements) Optimization Init(8) IntegerRange(0, 16) Param 306Maximum pieces that IPA-SRA tracks per formal parameter, as a consequence, also the maximum number of replacements of a formal parameter. 307 308-param=ipa-sra-ptr-growth-factor= 309Common Joined UInteger Var(param_ipa_sra_ptr_growth_factor) Init(2) Param Optimization 310Maximum allowed growth of number and total size of new parameters that ipa-sra replaces a pointer to an aggregate with. 311 312-param=ira-loop-reserved-regs= 313Common Joined UInteger Var(param_ira_loop_reserved_regs) Init(2) Param Optimization 314The number of registers in each class kept unused by loop invariant motion. 315 316-param=ira-max-conflict-table-size= 317Common Joined UInteger Var(param_ira_max_conflict_table_size) Init(1000) Param Optimization 318Max size of conflict table in MB. 319 320-param=ira-max-loops-num= 321Common Joined UInteger Var(param_ira_max_loops_num) Init(100) Param Optimization 322Max loops number for regional RA. 323 324-param=ira-consider-dup-in-all-alts= 325Common Joined UInteger Var(param_ira_consider_dup_in_all_alts) Init(1) IntegerRange(0, 1) Param Optimization 326Control ira to consider matching constraint (duplicated operand number) heavily in all available alternatives for preferred register class. If it is set as zero, it means ira only respects the matching constraint when it's in the only available alternative with an appropriate register class. Otherwise, it means ira will check all available alternatives for preferred register class even if it has found some choice with an appropriate register class and respect the found qualified matching constraint. 327 328-param=iv-always-prune-cand-set-bound= 329Common Joined UInteger Var(param_iv_always_prune_cand_set_bound) Init(10) Param Optimization 330If number of candidates in the set is smaller, we always try to remove unused ivs during its optimization. 331 332-param=iv-consider-all-candidates-bound= 333Common Joined UInteger Var(param_iv_consider_all_candidates_bound) Init(40) Param Optimization 334Bound on number of candidates below that all candidates are considered in iv optimizations. 335 336-param=iv-max-considered-uses= 337Common Joined UInteger Var(param_iv_max_considered_uses) Init(250) Param Optimization 338Bound on number of iv uses in loop optimized in iv optimizations. 339 340-param=jump-table-max-growth-ratio-for-size= 341Common Joined UInteger Var(param_jump_table_max_growth_ratio_for_size) Init(300) Param Optimization 342The maximum code size growth ratio when expanding into a jump table (in percent). The parameter is used when optimizing for size. 343 344-param=jump-table-max-growth-ratio-for-speed= 345Common Joined UInteger Var(param_jump_table_max_growth_ratio_for_speed) Init(800) Param Optimization 346The maximum code size growth ratio when expanding into a jump table (in percent). The parameter is used when optimizing for speed. 347 348-param=l1-cache-line-size= 349Common Joined UInteger Var(param_l1_cache_line_size) Init(32) Param Optimization 350The size of L1 cache line. 351 352-param=destructive-interference-size= 353Common Joined UInteger Var(param_destruct_interfere_size) Init(0) Param Optimization 354The minimum recommended offset between two concurrently-accessed objects to 355avoid additional performance degradation due to contention introduced by the 356implementation. Typically the L1 cache line size, but can be larger to 357accommodate a variety of target processors with different cache line sizes. 358C++17 code might use this value in structure layout, but is strongly 359discouraged from doing so in public ABIs. 360 361-param=constructive-interference-size= 362Common Joined UInteger Var(param_construct_interfere_size) Init(0) Param Optimization 363The maximum recommended size of contiguous memory occupied by two objects 364accessed with temporal locality by concurrent threads. Typically the L1 cache 365line size, but can be smaller to accommodate a variety of target processors with 366different cache line sizes. 367 368-param=l1-cache-size= 369Common Joined UInteger Var(param_l1_cache_size) Init(64) Param Optimization 370The size of L1 cache. 371 372-param=l2-cache-size= 373Common Joined UInteger Var(param_l2_cache_size) Init(512) Param Optimization 374The size of L2 cache. 375 376-param=large-function-growth= 377Common Joined UInteger Var(param_large_function_growth) Optimization Init(100) Param 378Maximal growth due to inlining of large function (in percent). 379 380-param=large-function-insns= 381Common Joined UInteger Var(param_large_function_insns) Optimization Init(2700) Param 382The size of function body to be considered large. 383 384-param=large-stack-frame= 385Common Joined UInteger Var(param_large_stack_frame) Init(256) Optimization Param 386The size of stack frame to be considered large. 387 388-param=large-stack-frame-growth= 389Common Joined UInteger Var(param_stack_frame_growth) Optimization Init(1000) Param 390Maximal stack frame growth due to inlining (in percent). 391 392-param=large-unit-insns= 393Common Joined UInteger Var(param_large_unit_insns) Optimization Init(10000) Param 394The size of translation unit to be considered large. 395 396-param=lazy-modules= 397C++ Joined UInteger Var(param_lazy_modules) Init(32768) Param 398Maximum number of concurrently open C++ module files when lazy loading. 399 400-param=lim-expensive= 401Common Joined UInteger Var(param_lim_expensive) Init(20) Param Optimization 402The minimum cost of an expensive expression in the loop invariant motion. 403 404-param=logical-op-non-short-circuit= 405Common Joined UInteger Var(param_logical_op_non_short_circuit) Init(-1) IntegerRange(0, 1) Param 406True if a non-short-circuit operation is optimal. 407 408-param=loop-block-tile-size= 409Common Joined UInteger Var(param_loop_block_tile_size) Init(51) Param Optimization 410Size of tiles for loop blocking. 411 412-param=loop-interchange-max-num-stmts= 413Common Joined UInteger Var(param_loop_interchange_max_num_stmts) Init(64) Param Optimization 414The maximum number of stmts in loop nest for loop interchange. 415 416-param=loop-interchange-stride-ratio= 417Common Joined UInteger Var(param_loop_interchange_stride_ratio) Init(2) Param Optimization 418The minimum stride ratio for loop interchange to be profitable. 419 420-param=loop-invariant-max-bbs-in-loop= 421Common Joined UInteger Var(param_loop_invariant_max_bbs_in_loop) Init(10000) Param Optimization 422Max basic blocks number in loop for loop invariant motion. 423 424-param=loop-max-datarefs-for-datadeps= 425Common Joined UInteger Var(param_loop_max_datarefs_for_datadeps) Init(1000) Param Optimization 426Maximum number of datarefs in loop for building loop data dependencies. 427 428-param=loop-versioning-max-inner-insns= 429Common Joined UInteger Var(param_loop_versioning_max_inner_insns) Init(200) Param Optimization 430The maximum number of instructions in an inner loop that is being considered for versioning. 431 432-param=loop-versioning-max-outer-insns= 433Common Joined UInteger Var(param_loop_versioning_max_outer_insns) Init(100) Param Optimization 434The maximum number of instructions in an outer loop that is being considered for versioning, on top of the instructions in inner loops. 435 436-param=lra-inheritance-ebb-probability-cutoff= 437Common Joined UInteger Var(param_lra_inheritance_ebb_probability_cutoff) Init(40) IntegerRange(0, 100) Param Optimization 438Minimal fall-through edge probability in percentage used to add BB to inheritance EBB in LRA. 439 440-param=lra-max-considered-reload-pseudos= 441Common Joined UInteger Var(param_lra_max_considered_reload_pseudos) Init(500) Param Optimization 442The max number of reload pseudos which are considered during spilling a non-reload pseudo. 443 444-param=lto-max-partition= 445Common Joined UInteger Var(param_max_partition_size) Init(1000000) Param 446Maximal size of a partition for LTO (in estimated instructions). 447 448-param=lto-max-streaming-parallelism= 449Common Joined UInteger Var(param_max_lto_streaming_parallelism) Init(32) IntegerRange(1, 65536) Param 450maximal number of LTO partitions streamed in parallel. 451 452-param=lto-min-partition= 453Common Joined UInteger Var(param_min_partition_size) Init(10000) Param 454Minimal size of a partition for LTO (in estimated instructions). 455 456-param=lto-partitions= 457Common Joined UInteger Var(param_lto_partitions) Init(128) IntegerRange(1, 65536) Param 458Number of partitions the program should be split to. 459 460-param=max-average-unrolled-insns= 461Common Joined UInteger Var(param_max_average_unrolled_insns) Init(80) Param Optimization 462The maximum number of instructions to consider to unroll in a loop on average. 463 464-param=max-combine-insns= 465Common Joined UInteger Var(param_max_combine_insns) Init(4) IntegerRange(2, 4) Param Optimization 466The maximum number of insns combine tries to combine. 467 468-param=max-completely-peel-loop-nest-depth= 469Common Joined UInteger Var(param_max_unroll_iterations) Init(8) Param Optimization 470The maximum depth of a loop nest we completely peel. 471 472-param=max-completely-peel-times= 473Common Joined UInteger Var(param_max_completely_peel_times) Init(16) Param Optimization 474The maximum number of peelings of a single loop that is peeled completely. 475 476-param=max-completely-peeled-insns= 477Common Joined UInteger Var(param_max_completely_peeled_insns) Init(200) Param Optimization 478The maximum number of insns of a completely peeled loop. 479 480-param=max-crossjump-edges= 481Common Joined UInteger Var(param_max_crossjump_edges) Init(100) Param Optimization 482The maximum number of incoming edges to consider for crossjumping. 483 484-param=max-cse-insns= 485Common Joined UInteger Var(param_max_cse_insns) Init(1000) Param Optimization 486The maximum instructions CSE process before flushing. 487 488-param=max-cse-path-length= 489Common Joined UInteger Var(param_max_cse_path_length) Init(10) IntegerRange(1, 65536) Param Optimization 490The maximum length of path considered in cse. 491 492-param=max-cselib-memory-locations= 493Common Joined UInteger Var(param_max_cselib_memory_locations) Init(500) Param Optimization 494The maximum memory locations recorded by cselib. 495 496-param=max-debug-marker-count= 497Common Joined UInteger Var(param_max_debug_marker_count) Init(100000) Param Optimization 498Max. count of debug markers to expand or inline. 499 500-param=max-delay-slot-insn-search= 501Common Joined UInteger Var(param_max_delay_slot_insn_search) Init(100) Param Optimization 502The maximum number of instructions to consider to fill a delay slot. 503 504-param=max-delay-slot-live-search= 505Common Joined UInteger Var(param_max_delay_slot_live_search) Init(333) Param Optimization 506The maximum number of instructions to consider to find accurate live register information. 507 508-param=max-dse-active-local-stores= 509Common Joined UInteger Var(param_max_dse_active_local_stores) Init(5000) Param Optimization 510Maximum number of active local stores in RTL dead store elimination. 511 512-param=max-early-inliner-iterations= 513Common Joined UInteger Var(param_early_inliner_max_iterations) Init(1) Param Optimization 514The maximum number of nested indirect inlining performed by early inliner. 515 516-param=max-fields-for-field-sensitive= 517Common Joined UInteger Var(param_max_fields_for_field_sensitive) Param 518Maximum number of fields in a structure before pointer analysis treats the structure as a single variable. 519 520-param=max-fsm-thread-length= 521Common Joined UInteger Var(param_max_fsm_thread_length) Init(10) IntegerRange(1, 999999) Param Optimization 522Maximum number of basic blocks on a jump thread path. 523 524-param=max-fsm-thread-path-insns= 525Common Joined UInteger Var(param_max_fsm_thread_path_insns) Init(100) IntegerRange(1, 999999) Param Optimization 526Maximum number of instructions to copy when duplicating blocks on a finite state automaton jump thread path. 527 528-param=max-gcse-insertion-ratio= 529Common Joined UInteger Var(param_max_gcse_insertion_ratio) Init(20) Param Optimization 530The maximum ratio of insertions to deletions of expressions in GCSE. 531 532-param=max-gcse-memory= 533Common Joined UInteger Var(param_max_gcse_memory) Init(131072) Param Optimization 534The maximum amount of memory to be allocated by GCSE, in kilobytes. 535 536-param=max-goto-duplication-insns= 537Common Joined UInteger Var(param_max_goto_duplication_insns) Init(8) Param Optimization 538The maximum number of insns to duplicate when unfactoring computed gotos. 539 540-param=max-grow-copy-bb-insns= 541Common Joined UInteger Var(param_max_grow_copy_bb_insns) Init(8) Param Optimization 542The maximum expansion factor when copying basic blocks. 543 544-param=max-hoist-depth= 545Common Joined UInteger Var(param_max_hoist_depth) Init(30) Param Optimization 546Maximum depth of search in the dominator tree for expressions to hoist. 547 548-param=max-inline-functions-called-once-loop-depth= 549Common Joined UInteger Var(param_inline_functions_called_once_loop_depth) Init(6) Optimization Param 550Maximum loop depth of a call which is considered for inlining functions called once. 551 552-param=max-inline-functions-called-once-insns= 553Common Joined UInteger Var(param_inline_functions_called_once_insns) Init(4000) Optimization Param 554Maximum combined size of caller and callee which is inlined if callee is called once. 555 556-param=max-inline-insns-auto= 557Common Joined UInteger Var(param_max_inline_insns_auto) Init(15) Optimization Param 558The maximum number of instructions when automatically inlining. 559 560-param=max-inline-insns-recursive= 561Common Joined UInteger Var(param_max_inline_insns_recursive) Optimization Init(450) Param 562The maximum number of instructions inline function can grow to via recursive inlining. 563 564-param=max-inline-insns-recursive-auto= 565Common Joined UInteger Var(param_max_inline_insns_recursive_auto) Optimization Init(450) Param 566The maximum number of instructions non-inline function can grow to via recursive inlining. 567 568-param=max-inline-insns-single= 569Common Joined UInteger Var(param_max_inline_insns_single) Optimization Init(70) Param 570The maximum number of instructions in a single function eligible for inlining. 571 572-param=max-inline-insns-size= 573Common Joined UInteger Var(param_max_inline_insns_size) Optimization Param 574The maximum number of instructions when inlining for size. 575 576-param=max-inline-insns-small= 577Common Joined UInteger Var(param_max_inline_insns_small) Optimization Param 578The maximum number of instructions when automatically inlining small functions. 579 580-param=max-inline-recursive-depth= 581Common Joined UInteger Var(param_max_inline_recursive_depth) Optimization Init(8) Param 582The maximum depth of recursive inlining for inline functions. 583 584-param=max-inline-recursive-depth-auto= 585Common Joined UInteger Var(param_max_inline_recursive_depth_auto) Optimization Init(8) Param 586The maximum depth of recursive inlining for non-inline functions. 587 588-param=max-isl-operations= 589Common Joined UInteger Var(param_max_isl_operations) Init(350000) Param Optimization 590Maximum number of isl operations, 0 means unlimited. 591 592-param=max-iterations-computation-cost= 593Common Joined UInteger Var(param_max_iterations_computation_cost) Init(10) Param Optimization 594Bound on the cost of an expression to compute the number of iterations. 595 596-param=max-iterations-to-track= 597Common Joined UInteger Var(param_max_iterations_to_track) Init(1000) Param Optimization 598Bound on the number of iterations the brute force # of iterations analysis algorithm evaluates. 599 600-param=max-jump-thread-duplication-stmts= 601Common Joined UInteger Var(param_max_jump_thread_duplication_stmts) Init(15) Param Optimization 602Maximum number of statements allowed in a block that needs to be duplicated when threading jumps. 603 604-param=max-last-value-rtl= 605Common Joined UInteger Var(param_max_last_value_rtl) Init(10000) Param Optimization 606The maximum number of RTL nodes that can be recorded as combiner's last value. 607 608-param=max-loop-header-insns= 609Common Joined UInteger Var(param_max_loop_header_insns) Init(20) Param Optimization 610The maximum number of insns in loop header duplicated by the copy loop headers pass. 611 612-param=max-modulo-backtrack-attempts= 613Common Joined UInteger Var(param_max_modulo_backtrack_attempts) Init(40) Param Optimization 614The maximum number of backtrack attempts the scheduler should make when modulo scheduling a loop. 615 616-param=min-pagesize= 617Common Joined UInteger Var(param_min_pagesize) Init(4096) Param Optimization 618Minimum page size for warning purposes. 619 620-param=max-partial-antic-length= 621Common Joined UInteger Var(param_max_partial_antic_length) Init(100) Param Optimization 622Maximum length of partial antic set when performing tree pre optimization. 623 624-param=max-peel-branches= 625Common Joined UInteger Var(param_max_peel_branches) Init(32) Param Optimization 626The maximum number of branches on the path through the peeled sequence. 627 628-param=max-peel-times= 629Common Joined UInteger Var(param_max_peel_times) Init(16) Param Optimization 630The maximum number of peelings of a single loop. 631 632-param=max-peeled-insns= 633Common Joined UInteger Var(param_max_peeled_insns) Init(100) Param Optimization 634The maximum number of insns of a peeled loop. 635 636-param=max-pending-list-length= 637Common Joined UInteger Var(param_max_pending_list_length) Init(32) Param Optimization 638The maximum length of scheduling's pending operations list. 639 640-param=max-pipeline-region-blocks= 641Common Joined UInteger Var(param_max_pipeline_region_blocks) Init(15) Param Optimization 642The maximum number of blocks in a region to be considered for interblock scheduling. 643 644-param=max-pipeline-region-insns= 645Common Joined UInteger Var(param_max_pipeline_region_insns) Init(200) Param Optimization 646The maximum number of insns in a region to be considered for interblock scheduling. 647 648-param=max-pow-sqrt-depth= 649Common Joined UInteger Var(param_max_pow_sqrt_depth) Init(5) IntegerRange(1, 32) Param Optimization 650Maximum depth of sqrt chains to use when synthesizing exponentiation by a real constant. 651 652-param=max-predicted-iterations= 653Common Joined UInteger Var(param_max_predicted_iterations) Init(100) IntegerRange(0, 65536) Param Optimization 654The maximum number of loop iterations we predict statically. 655 656-param=max-reload-search-insns= 657Common Joined UInteger Var(param_max_reload_search_insns) Init(100) Param Optimization 658The maximum number of instructions to search backward when looking for equivalent reload. 659 660-param=max-rtl-if-conversion-insns= 661Common Joined UInteger Var(param_max_rtl_if_conversion_insns) Init(10) IntegerRange(0, 99) Param Optimization 662Maximum number of insns in a basic block to consider for RTL if-conversion. 663 664-param=max-rtl-if-conversion-predictable-cost= 665Common Joined UInteger Var(param_max_rtl_if_conversion_predictable_cost) Init(20) IntegerRange(0, 200) Param Optimization 666Maximum permissible cost for the sequence that would be generated by the RTL if-conversion pass for a branch that is considered predictable. 667 668-param=max-rtl-if-conversion-unpredictable-cost= 669Common Joined UInteger Var(param_max_rtl_if_conversion_unpredictable_cost) Init(40) IntegerRange(0, 200) Param Optimization 670Maximum permissible cost for the sequence that would be generated by the RTL if-conversion pass for a branch that is considered unpredictable. 671 672-param=max-sched-extend-regions-iters= 673Common Joined UInteger Var(param_max_sched_extend_regions_iters) Param Optimization 674The maximum number of iterations through CFG to extend regions. 675 676-param=max-sched-insn-conflict-delay= 677Common Joined UInteger Var(param_max_sched_insn_conflict_delay) Init(3) IntegerRange(1, 10) Param Optimization 678The maximum conflict delay for an insn to be considered for speculative motion. 679 680-param=max-sched-ready-insns= 681Common Joined UInteger Var(param_max_sched_ready_insns) Init(100) IntegerRange(1, 65536) Param Optimization 682The maximum number of instructions ready to be issued to be considered by the scheduler during the first scheduling pass. 683 684-param=max-sched-region-blocks= 685Common Joined UInteger Var(param_max_sched_region_blocks) Init(10) Param Optimization 686The maximum number of blocks in a region to be considered for interblock scheduling. 687 688-param=max-sched-region-insns= 689Common Joined UInteger Var(param_max_sched_region_insns) Init(100) Param Optimization 690The maximum number of insns in a region to be considered for interblock scheduling. 691 692-param=max-slsr-cand-scan= 693Common Joined UInteger Var(param_max_slsr_candidate_scan) Init(50) IntegerRange(1, 999999) Param Optimization 694Maximum length of candidate scans for straight-line strength reduction. 695 696-param=max-speculative-devirt-maydefs= 697Common Joined UInteger Var(param_max_speculative_devirt_maydefs) Init(50) Param Optimization 698Maximum number of may-defs visited when devirtualizing speculatively. 699 700-param=max-ssa-name-query-depth= 701Common Joined UInteger Var(param_max_ssa_name_query_depth) Init(3) IntegerRange(1, 10) Param 702Maximum recursion depth allowed when querying a property of an SSA name. 703 704-param=max-stores-to-merge= 705Common Joined UInteger Var(param_max_stores_to_merge) Init(64) IntegerRange(2, 65536) Param Optimization 706Maximum number of constant stores to merge in the store merging pass. 707 708-param=max-stores-to-sink= 709Common Joined UInteger Var(param_max_stores_to_sink) Init(2) Param Optimization 710Maximum number of conditional store pairs that can be sunk. 711 712-param=max-store-chains-to-track= 713Common Joined UInteger Var(param_max_store_chains_to_track) Init(64) IntegerRange(1, 65536) Param 714Maximum number of store chains to track at the same time in the store merging pass. 715 716-param=max-stores-to-track= 717Common Joined UInteger Var(param_max_stores_to_track) Init(1024) IntegerRange(2, 1048576) Param 718Maximum number of store chains to track at the same time in the store merging pass. 719 720-param=max-tail-merge-comparisons= 721Common Joined UInteger Var(param_max_tail_merge_comparisons) Init(10) Param Optimization 722Maximum amount of similar bbs to compare a bb with. 723 724-param=max-tail-merge-iterations= 725Common Joined UInteger Var(param_max_tail_merge_iterations) Init(2) Param Optimization 726Maximum amount of iterations of the pass over a function. 727 728-param=max-tracked-strlens= 729Common Joined UInteger Var(param_max_tracked_strlens) Init(10000) Param Optimization 730Maximum number of strings for which strlen optimization pass will track string lengths. 731 732-param=max-tree-if-conversion-phi-args= 733Common Joined UInteger Var(param_max_tree_if_conversion_phi_args) Init(4) IntegerRange(2, 65536) Param Optimization 734Maximum number of arguments in a PHI supported by TREE if-conversion unless the loop is marked with simd pragma. 735 736-param=max-unroll-times= 737Common Joined UInteger Var(param_max_unroll_times) Init(8) Param Optimization 738The maximum number of unrollings of a single loop. 739 740-param=max-unrolled-insns= 741Common Joined UInteger Var(param_max_unrolled_insns) Init(200) Param Optimization 742The maximum number of instructions to consider to unroll in a loop. 743 744-param=max-unswitch-insns= 745Common Joined UInteger Var(param_max_unswitch_insns) Init(50) Param Optimization 746The maximum number of insns of an unswitched loop. 747 748-param=max-unswitch-level= 749Common Joined UInteger Var(param_max_unswitch_level) Init(3) Param Optimization 750The maximum number of unswitchings in a single loop. 751 752-param=max-variable-expansions-in-unroller= 753Common Joined UInteger Var(param_max_variable_expansions) Init(1) Param Optimization 754If -fvariable-expansion-in-unroller is used, the maximum number of times that an individual variable will be expanded during loop unrolling. 755 756-param=max-vartrack-expr-depth= 757Common Joined UInteger Var(param_max_vartrack_expr_depth) Init(12) Param Optimization 758Max. recursion depth for expanding var tracking expressions. 759 760-param=max-vartrack-reverse-op-size= 761Common Joined UInteger Var(param_max_vartrack_reverse_op_size) Init(50) Param Optimization 762Max. size of loc list for which reverse ops should be added. 763 764-param=max-vartrack-size= 765Common Joined UInteger Var(param_max_vartrack_size) Init(50000000) Param Optimization 766Max. size of var tracking hash tables. 767 768-param=max-find-base-term-values= 769Common Joined UInteger Var(param_max_find_base_term_values) Init(200) Param Optimization 770Maximum number of VALUEs handled during a single find_base_term call. 771 772-param=max-vrp-switch-assertions= 773Common Joined UInteger Var(param_max_vrp_switch_assertions) Init(10) Param Optimization 774Maximum number of assertions to add along the default edge of a switch statement during VRP. 775 776-param=min-crossjump-insns= 777Common Joined UInteger Var(param_min_crossjump_insns) Init(5) IntegerRange(1, 65536) Param Optimization 778The minimum number of matching instructions to consider for crossjumping. 779 780-param=min-inline-recursive-probability= 781Common Joined UInteger Var(param_min_inline_recursive_probability) Init(10) Optimization Param 782Inline recursively only when the probability of call being executed exceeds the parameter. 783 784-param=min-insn-to-prefetch-ratio= 785Common Joined UInteger Var(param_min_insn_to_prefetch_ratio) Init(9) Param Optimization 786Min. ratio of insns to prefetches to enable prefetching for a loop with an unknown trip count. 787 788-param=min-loop-cond-split-prob= 789Common Joined UInteger Var(param_min_loop_cond_split_prob) Init(30) IntegerRange(0, 100) Param Optimization 790The minimum threshold for probability of semi-invariant condition statement to trigger loop split. 791 792-param=min-nondebug-insn-uid= 793Common Joined UInteger Var(param_min_nondebug_insn_uid) Param 794The minimum UID to be used for a nondebug insn. 795 796-param=min-size-for-stack-sharing= 797Common Joined UInteger Var(param_min_size_for_stack_sharing) Init(32) Param Optimization 798The minimum size of variables taking part in stack slot sharing when not optimizing. 799 800-param=min-spec-prob= 801Common Joined UInteger Var(param_min_spec_prob) Init(40) Param Optimization 802The minimum probability of reaching a source block for interblock speculative scheduling. 803 804-param=min-vect-loop-bound= 805Common Joined UInteger Var(param_min_vect_loop_bound) Param Optimization 806If -ftree-vectorize is used, the minimal loop bound of a loop to be considered for vectorization. 807 808-param=openacc-kernels= 809Common Joined Enum(openacc_kernels) Var(param_openacc_kernels) Init(OPENACC_KERNELS_PARLOOPS) Param 810--param=openacc-kernels=[decompose|parloops] Specify mode of OpenACC 'kernels' constructs handling. 811 812Enum 813Name(openacc_kernels) Type(enum openacc_kernels) 814 815EnumValue 816Enum(openacc_kernels) String(decompose) Value(OPENACC_KERNELS_DECOMPOSE) 817 818EnumValue 819Enum(openacc_kernels) String(parloops) Value(OPENACC_KERNELS_PARLOOPS) 820 821-param=openacc-privatization= 822Common Joined Enum(openacc_privatization) Var(param_openacc_privatization) Init(OPENACC_PRIVATIZATION_QUIET) Param 823--param=openacc-privatization=[quiet|noisy] Specify mode of OpenACC privatization diagnostics. 824 825Enum 826Name(openacc_privatization) Type(enum openacc_privatization) 827 828EnumValue 829Enum(openacc_privatization) String(quiet) Value(OPENACC_PRIVATIZATION_QUIET) 830 831EnumValue 832Enum(openacc_privatization) String(noisy) Value(OPENACC_PRIVATIZATION_NOISY) 833 834-param=parloops-chunk-size= 835Common Joined UInteger Var(param_parloops_chunk_size) Param Optimization 836Chunk size of omp schedule for loops parallelized by parloops. 837 838-param=parloops-min-per-thread= 839Common Joined UInteger Var(param_parloops_min_per_thread) Init(100) IntegerRange(2, 65536) Param Optimization 840Minimum number of iterations per thread of an innermost parallelized loop. 841 842-param=parloops-schedule= 843Common Joined Var(param_parloops_schedule) Enum(parloops_schedule_type) Param Optimization 844--param=parloops-schedule=[static|dynamic|guided|auto|runtime] Schedule type of omp schedule for loops parallelized by parloops. 845 846Enum 847Name(parloops_schedule_type) Type(int) 848 849EnumValue 850Enum(parloops_schedule_type) String(static) Value(PARLOOPS_SCHEDULE_STATIC) 851 852EnumValue 853Enum(parloops_schedule_type) String(dynamic) Value(PARLOOPS_SCHEDULE_DYNAMIC) 854 855EnumValue 856Enum(parloops_schedule_type) String(guided) Value(PARLOOPS_SCHEDULE_GUIDED) 857 858EnumValue 859Enum(parloops_schedule_type) String(auto) Value(PARLOOPS_SCHEDULE_AUTO) 860 861EnumValue 862Enum(parloops_schedule_type) String(runtime) Value(PARLOOPS_SCHEDULE_RUNTIME) 863 864-param=partial-inlining-entry-probability= 865Common Joined UInteger Var(param_partial_inlining_entry_probability) Init(70) Optimization IntegerRange(0, 100) Param 866Maximum probability of the entry BB of split region (in percent relative to entry BB of the function) to make partial inlining happen. 867 868-param=predictable-branch-outcome= 869Common Joined UInteger Var(param_predictable_branch_outcome) Init(2) IntegerRange(0, 50) Param Optimization 870Maximal estimated outcome of branch considered predictable. 871 872-param=prefetch-dynamic-strides= 873Common Joined UInteger Var(param_prefetch_dynamic_strides) Init(1) IntegerRange(0, 1) Param Optimization 874Whether software prefetch hints should be issued for non-constant strides. 875 876-param=prefetch-latency= 877Common Joined UInteger Var(param_prefetch_latency) Init(200) Param Optimization 878The number of insns executed before prefetch is completed. 879 880-param=prefetch-min-insn-to-mem-ratio= 881Common Joined UInteger Var(param_prefetch_min_insn_to_mem_ratio) Init(3) Param Optimization 882Min. ratio of insns to mem ops to enable prefetching in a loop. 883 884-param=prefetch-minimum-stride= 885Common Joined UInteger Var(param_prefetch_minimum_stride) Init(-1) Param Optimization 886The minimum constant stride beyond which we should use prefetch hints for. 887 888-param=profile-func-internal-id= 889Common Joined UInteger Var(param_profile_func_internal_id) IntegerRange(0, 1) Param 890Use internal function id in profile lookup. 891 892-param=ranger-debug= 893Common Joined Var(param_ranger_debug) Enum(ranger_debug) Init(RANGER_DEBUG_NONE) Param Optimization 894--param=ranger-debug=[none|trace|gori|cache|tracegori|all] Specifies the output mode for debugging ranger. 895 896Enum 897Name(ranger_debug) Type(enum ranger_debug) UnknownError(unknown ranger debug mode %qs) 898 899EnumValue 900Enum(ranger_debug) String(none) Value(RANGER_DEBUG_NONE) 901 902EnumValue 903Enum(ranger_debug) String(trace) Value(RANGER_DEBUG_TRACE) 904 905EnumValue 906Enum(ranger_debug) String(cache) Value(RANGER_DEBUG_TRACE_CACHE) 907 908EnumValue 909Enum(ranger_debug) String(gori) Value(RANGER_DEBUG_GORI) 910 911EnumValue 912Enum(ranger_debug) String(tracegori) Value(RANGER_DEBUG_TRACE_GORI) 913 914EnumValue 915Enum(ranger_debug) String(all) Value(RANGER_DEBUG_ALL) 916 917-param=ranger-logical-depth= 918Common Joined UInteger Var(param_ranger_logical_depth) Init(6) IntegerRange(1, 999) Param Optimization 919Maximum depth of logical expression evaluation ranger will look through when 920evaluating outgoing edge ranges. 921 922-param=relation-block-limit= 923Common Joined UInteger Var(param_relation_block_limit) Init(200) IntegerRange(0, 9999) Param Optimization 924Maximum number of relations the oracle will register in a basic block. 925 926-param=rpo-vn-max-loop-depth= 927Common Joined UInteger Var(param_rpo_vn_max_loop_depth) Init(7) IntegerRange(2, 65536) Param Optimization 928Maximum depth of a loop nest to fully value-number optimistically. 929 930-param=sccvn-max-alias-queries-per-access= 931Common Joined UInteger Var(param_sccvn_max_alias_queries_per_access) Init(1000) Param Optimization 932Maximum number of disambiguations to perform per memory access. 933 934-param=scev-max-expr-complexity= 935Common Joined UInteger Var(param_scev_max_expr_complexity) Init(10) Param Optimization 936Bound on the complexity of the expressions in the scalar evolutions analyzer. 937 938-param=scev-max-expr-size= 939Common Joined UInteger Var(param_scev_max_expr_size) Init(100) Param Optimization 940Bound on size of expressions used in the scalar evolutions analyzer. 941 942-param=sched-autopref-queue-depth= 943Common Joined UInteger Var(param_sched_autopref_queue_depth) Init(-1) Param Optimization 944Hardware autoprefetcher scheduler model control flag. Number of lookahead cycles the model looks into, at '0' only enable instruction sorting heuristic. Disabled by default. 945 946-param=sched-mem-true-dep-cost= 947Common Joined UInteger Var(param_sched_mem_true_dep_cost) Init(1) Param Optimization 948Minimal distance between possibly conflicting store and load. 949 950-param=sched-pressure-algorithm= 951Common Joined UInteger Var(param_sched_pressure_algorithm) Init(1) IntegerRange(1, 2) Param Optimization 952Which -fsched-pressure algorithm to apply. 953 954-param=sched-spec-prob-cutoff= 955Common Joined UInteger Var(param_sched_spec_prob_cutoff) Init(40) IntegerRange(0, 100) Param Optimization 956The minimal probability of speculation success (in percents), so that speculative insn will be scheduled. 957 958-param=sched-state-edge-prob-cutoff= 959Common Joined UInteger Var(param_sched_state_edge_prob_cutoff) Init(10) IntegerRange(0, 100) Param Optimization 960The minimum probability an edge must have for the scheduler to save its state across it. 961 962-param=selsched-insns-to-rename= 963Common Joined UInteger Var(param_selsched_insns_to_rename) Init(2) Param Optimization 964Maximum number of instructions in the ready list that are considered eligible for renaming. 965 966-param=selsched-max-lookahead= 967Common Joined UInteger Var(param_selsched_max_lookahead) Init(50) Param Optimization 968The maximum size of the lookahead window of selective scheduling. 969 970-param=selsched-max-sched-times= 971Common Joined UInteger Var(param_selsched_max_sched_times) Init(2) IntegerRange(1, 65536) Param Optimization 972Maximum number of times that an insn could be scheduled. 973 974-param=simultaneous-prefetches= 975Common Joined UInteger Var(param_simultaneous_prefetches) Init(3) Param Optimization 976The number of prefetches that can run at the same time. 977 978-param=sink-frequency-threshold= 979Common Joined UInteger Var(param_sink_frequency_threshold) Init(75) IntegerRange(0, 100) Param Optimization 980Target block's relative execution frequency (as a percentage) required to sink a statement. 981 982-param=sms-dfa-history= 983Common Joined UInteger Var(param_sms_dfa_history) IntegerRange(0, 16) Param Optimization 984The number of cycles the swing modulo scheduler considers when checking conflicts using DFA. 985 986-param=sms-loop-average-count-threshold= 987Common Joined UInteger Var(param_sms_loop_average_count_threshold) Param Optimization 988A threshold on the average loop count considered by the swing modulo scheduler. 989 990-param=sms-max-ii-factor= 991Common Joined UInteger Var(param_sms_max_ii_factor) Init(2) IntegerRange(1, 16) Param Optimization 992A factor for tuning the upper bound that swing modulo scheduler uses for scheduling a loop. 993 994-param=sms-min-sc= 995Common Joined UInteger Var(param_sms_min_sc) Init(2) IntegerRange(1, 2) Param Optimization 996The minimum value of stage count that swing modulo scheduler will generate. 997 998-param=sra-max-scalarization-size-Osize= 999Common Joined UInteger Var(param_sra_max_scalarization_size_size) Param Optimization 1000Maximum size, in storage units, of an aggregate which should be considered for scalarization when compiling for size. 1001 1002-param=sra-max-scalarization-size-Ospeed= 1003Common Joined UInteger Var(param_sra_max_scalarization_size_speed) Param Optimization 1004Maximum size, in storage units, of an aggregate which should be considered for scalarization when compiling for speed. 1005 1006-param=sra-max-propagations= 1007Common Joined UInteger Var(param_sra_max_propagations) Param Optimization Init(32) 1008Maximum number of artificial accesses to enable forward propagation that Scalar Replacement of Aggregates will keep for one local variable. 1009 1010-param=ssa-name-def-chain-limit= 1011Common Joined UInteger Var(param_ssa_name_def_chain_limit) Init(512) Param Optimization 1012The maximum number of SSA_NAME assignments to follow in determining a value. 1013 1014-param=ssp-buffer-size= 1015Common Joined UInteger Var(param_ssp_buffer_size) Init(8) IntegerRange(1, 65536) Param Optimization 1016The lower bound for a buffer to be considered for stack smashing protection. 1017 1018-param=stack-clash-protection-guard-size= 1019Common Joined UInteger Var(param_stack_clash_protection_guard_size) Init(12) IntegerRange(12, 30) Param Optimization 1020Size of the stack guard expressed as a power of two in bytes. 1021 1022-param=stack-clash-protection-probe-interval= 1023Common Joined UInteger Var(param_stack_clash_protection_probe_interval) Init(12) IntegerRange(10, 16) Param Optimization 1024Interval in which to probe the stack expressed as a power of two in bytes. 1025 1026-param=store-merging-allow-unaligned= 1027Common Joined UInteger Var(param_store_merging_allow_unaligned) Init(1) IntegerRange(0, 1) Param Optimization 1028Allow the store merging pass to introduce unaligned stores if it is legal to do so. 1029 1030-param=store-merging-max-size= 1031Common Joined UInteger Var(param_store_merging_max_size) Init(65536) IntegerRange(1, 65536) Param Optimization 1032Maximum size of a single store merging region in bytes. 1033 1034-param=switch-conversion-max-branch-ratio= 1035Common Joined UInteger Var(param_switch_conversion_branch_ratio) Init(8) IntegerRange(1, 65536) Param Optimization 1036The maximum ratio between array size and switch branches for a switch conversion to take place. 1037 1038-param=modref-max-bases= 1039Common Joined UInteger Var(param_modref_max_bases) Init(32) Param Optimization 1040Maximum number of bases stored in each modref tree. 1041 1042-param=modref-max-refs= 1043Common Joined UInteger Var(param_modref_max_refs) Init(16) Param Optimization 1044Maximum number of references stored in each modref base. 1045 1046-param=modref-max-accesses= 1047Common Joined UInteger Var(param_modref_max_accesses) Init(16) Param Optimization 1048Maximum number of accesses stored in each modref reference. 1049 1050-param=modref-max-tests= 1051Common Joined UInteger Var(param_modref_max_tests) Init(64) Param Optimization 1052Maximum number of tests performed by modref query. 1053 1054-param=modref-max-depth= 1055Common Joined UInteger Var(param_modref_max_depth) Init(256) IntegerRange(1, 65536) Param Optimization 1056Maximum depth of DFS walk used by modref escape analysis. 1057 1058-param=modref-max-escape-points= 1059Common Joined UInteger Var(param_modref_max_escape_points) Init(256) Param Optimization 1060Maximum number of escape points tracked by modref per SSA-name. 1061 1062-param=modref-max-adjustments= 1063Common Joined UInteger Var(param_modref_max_adjustments) Init(8) IntegerRange(0, 254) Param Optimization 1064Maximum number of times a given range is adjusted during the dataflow. 1065 1066-param=threader-debug= 1067Common Joined Var(param_threader_debug) Enum(threader_debug) Init(THREADER_DEBUG_NONE) Param Optimization 1068--param=threader-debug=[none|all] Enables verbose dumping of the threader solver. 1069 1070Enum 1071Name(threader_debug) Type(enum threader_debug) UnknownError(unknown threader debug mode %qs) 1072 1073EnumValue 1074Enum(threader_debug) String(none) Value(THREADER_DEBUG_NONE) 1075 1076EnumValue 1077Enum(threader_debug) String(all) Value(THREADER_DEBUG_ALL) 1078 1079-param=tm-max-aggregate-size= 1080Common Joined UInteger Var(param_tm_max_aggregate_size) Init(9) Param Optimization 1081Size in bytes after which thread-local aggregates should be instrumented with the logging functions instead of save/restore pairs. 1082 1083-param=tracer-dynamic-coverage= 1084Common Joined UInteger Var(param_tracer_dynamic_coverage) Init(75) IntegerRange(0, 100) Param Optimization 1085The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is not available. 1086 1087-param=tracer-dynamic-coverage-feedback= 1088Common Joined UInteger Var(param_tracer_dynamic_coverage_feedback) Init(95) IntegerRange(0, 100) Param Optimization 1089The percentage of function, weighted by execution frequency, that must be covered by trace formation. Used when profile feedback is available. 1090 1091-param=tracer-max-code-growth= 1092Common Joined UInteger Var(param_tracer_max_code_growth) Init(100) Param Optimization 1093Maximal code growth caused by tail duplication (in percent). 1094 1095-param=tracer-min-branch-probability= 1096Common Joined UInteger Var(param_tracer_min_branch_probability) Init(50) IntegerRange(0, 100) Param Optimization 1097Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is not available. 1098 1099-param=tracer-min-branch-probability-feedback= 1100Common Joined UInteger Var(param_tracer_min_branch_probability_feedback) Init(80) IntegerRange(0, 100) Param Optimization 1101Stop forward growth if the probability of best edge is less than this threshold (in percent). Used when profile feedback is available. 1102 1103-param=tracer-min-branch-ratio= 1104Common Joined UInteger Var(param_tracer_min_branch_ratio) Init(10) IntegerRange(0, 100) Param Optimization 1105Stop reverse growth if the reverse probability of best edge is less than this threshold (in percent). 1106 1107-param=tree-reassoc-width= 1108Common Joined UInteger Var(param_tree_reassoc_width) Param Optimization 1109Set the maximum number of instructions executed in parallel in reassociated tree. If 0, use the target dependent heuristic. 1110 1111-param=tsan-distinguish-volatile= 1112Common Joined UInteger Var(param_tsan_distinguish_volatile) IntegerRange(0, 1) Param 1113Emit special instrumentation for accesses to volatiles. 1114 1115-param=tsan-instrument-func-entry-exit= 1116Common Joined UInteger Var(param_tsan_instrument_func_entry_exit) Init(1) IntegerRange(0, 1) Param 1117Emit instrumentation calls to __tsan_func_entry() and __tsan_func_exit(). 1118 1119-param=uninit-control-dep-attempts= 1120Common Joined UInteger Var(param_uninit_control_dep_attempts) Init(1000) IntegerRange(1, 65536) Param Optimization 1121Maximum number of nested calls to search for control dependencies during uninitialized variable analysis. 1122 1123-param=uninlined-function-insns= 1124Common Joined UInteger Var(param_uninlined_function_insns) Init(2) Optimization IntegerRange(0, 1000000) Param 1125Instruction accounted for function prologue, epilogue and other overhead. 1126 1127-param=uninlined-function-time= 1128Common Joined UInteger Var(param_uninlined_function_time) Optimization IntegerRange(0, 1000000) Param 1129Time accounted for function prologue, epilogue and other overhead. 1130 1131-param=uninlined-thunk-insns= 1132Common Joined UInteger Var(param_uninlined_function_thunk_insns) Optimization Init(2) IntegerRange(0, 1000000) Param 1133Instruction accounted for function thunk overhead. 1134 1135-param=uninlined-thunk-time= 1136Common Joined UInteger Var(param_uninlined_function_thunk_time) Optimization Init(2) IntegerRange(0, 1000000) Param 1137Time accounted for function thunk overhead. 1138 1139-param=unlikely-bb-count-fraction= 1140Common Joined UInteger Var(param_unlikely_bb_count_fraction) Init(20) Param Optimization 1141The denominator n of fraction 1/n of the number of profiled runs of the entire program below which the execution count of a basic block must be in order for the basic block to be considered unlikely. 1142 1143-param=unroll-jam-max-unroll= 1144Common Joined UInteger Var(param_unroll_jam_max_unroll) Init(4) Param Optimization 1145Maximum unroll factor for the unroll-and-jam transformation. 1146 1147-param=unroll-jam-min-percent= 1148Common Joined UInteger Var(param_unroll_jam_min_percent) Init(1) IntegerRange(0, 100) Param Optimization 1149Minimum percentage of memrefs that must go away for unroll-and-jam to be considered profitable. 1150 1151-param=use-after-scope-direct-emission-threshold= 1152Common Joined UInteger Var(param_use_after_scope_direct_emission_threshold) Init(256) Param Optimization 1153Use direct poisoning/unpoisoning instructions for variables smaller or equal to this number. 1154 1155-param=use-canonical-types= 1156Common Joined UInteger Var(param_use_canonical_types) Init(1) IntegerRange(0, 1) Param 1157Whether to use canonical types. 1158 1159-param=vect-epilogues-nomask= 1160Common Joined UInteger Var(param_vect_epilogues_nomask) Init(1) IntegerRange(0, 1) Param Optimization 1161Enable loop epilogue vectorization using smaller vector size. 1162 1163-param=vect-max-peeling-for-alignment= 1164Common Joined UInteger Var(param_vect_max_peeling_for_alignment) Init(-1) IntegerRange(0, 64) Param Optimization 1165Maximum number of loop peels to enhance alignment of data references in a loop. 1166 1167-param=vect-max-version-for-alias-checks= 1168Common Joined UInteger Var(param_vect_max_version_for_alias_checks) Init(10) Param Optimization 1169Bound on number of runtime checks inserted by the vectorizer's loop versioning for alias check. 1170 1171-param=vect-max-version-for-alignment-checks= 1172Common Joined UInteger Var(param_vect_max_version_for_alignment_checks) Init(6) Param Optimization 1173Bound on number of runtime checks inserted by the vectorizer's loop versioning for alignment check. 1174 1175-param=vect-partial-vector-usage= 1176Common Joined UInteger Var(param_vect_partial_vector_usage) Init(2) IntegerRange(0, 2) Param Optimization 1177Controls how loop vectorizer uses partial vectors. 0 means never, 1 means only for loops whose need to iterate can be removed, 2 means for all loops. The default value is 2. 1178 1179-param=vect-inner-loop-cost-factor= 1180Common Joined UInteger Var(param_vect_inner_loop_cost_factor) Init(50) IntegerRange(1, 10000) Param Optimization 1181The maximum factor which the loop vectorizer applies to the cost of statements in an inner loop relative to the loop being vectorized. 1182 1183-param=vect-induction-float= 1184Common Joined UInteger Var(param_vect_induction_float) Init(1) IntegerRange(0, 1) Param Optimization 1185Enable loop vectorization of floating point inductions. 1186 1187-param=vrp1-mode= 1188Common Joined Var(param_vrp1_mode) Enum(vrp_mode) Init(VRP_MODE_VRP) Param Optimization 1189--param=vrp1-mode=[vrp|ranger] Specifies the mode VRP1 should operate in. 1190 1191-param=vrp2-mode= 1192Common Joined Var(param_vrp2_mode) Enum(vrp_mode) Init(VRP_MODE_RANGER) Param Optimization 1193--param=vrp2-mode=[vrp|ranger] Specifies the mode VRP2 should operate in. 1194 1195Enum 1196Name(vrp_mode) Type(enum vrp_mode) UnknownError(unknown vrp mode %qs) 1197 1198EnumValue 1199Enum(vrp_mode) String(vrp) Value(VRP_MODE_VRP) 1200 1201EnumValue 1202Enum(vrp_mode) String(ranger) Value(VRP_MODE_RANGER) 1203 1204; This comment is to ensure we retain the blank line above. 1205