nsz Git - cparser/blob - driver/firm_opt.c

   1 /**
   2  * (C) 2005-2010
   3  * @file
   4  * @author Michael Beck, Matthias Braun
   5  * @brief Firm-generating back end optimizations.
   6  */
   7 #include <config.h>
   8
   9 #include <stdbool.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <stdbool.h>
  13 #include <assert.h>
  14 #include <libfirm/firm.h>
  15
  16 #include "firm_opt.h"
  17 #include "firm_timing.h"
  18 #include "ast2firm.h"
  19 #include "adt/strutil.h"
  20 #include "adt/util.h"
  21
  22 /* optimization settings */
  23 struct a_firm_opt {
  24         bool     const_folding;   /**< enable constant folding */
  25         bool     cse;             /**< enable common-subexpression elimination */
  26         bool     confirm;         /**< enable Confirm optimization */
  27         bool     muls;            /**< enable architecture dependent mul optimization */
  28         bool     divs;            /**< enable architecture dependent div optimization */
  29         bool     mods;            /**< enable architecture dependent mod optimization */
  30         bool     alias_analysis;  /**< enable Alias Analysis */
  31         bool     strict_alias;    /**< enable strict Alias Analysis (using type based AA) */
  32         bool     no_alias;        /**< no aliasing possible. */
  33         bool     verify;          /**< Firm verifier setting */
  34         bool     check_all;       /**< enable checking all Firm phases */
  35         int      clone_threshold; /**< The threshold value for procedure cloning. */
  36         unsigned inline_maxsize;  /**< Maximum function size for inlining. */
  37         unsigned inline_threshold;/**< Inlining benefice threshold. */
  38 };
  39
  40 /** statistic options */
  41 typedef enum a_firmstat_selection_tag {
  42         STAT_NONE        = 0x00000000,
  43         STAT_BEFORE_OPT  = 0x00000001,
  44         STAT_AFTER_OPT   = 0x00000002,
  45         STAT_AFTER_LOWER = 0x00000004,
  46         STAT_FINAL_IR    = 0x00000008,
  47         STAT_FINAL       = 0x00000010,
  48 } a_firmstat_selection;
  49
  50 /* dumping options */
  51 struct a_firm_dump {
  52         bool debug_print;   /**< enable debug print */
  53         bool all_types;     /**< dump the All_types graph */
  54         bool ir_graph;      /**< dump all graphs */
  55         bool all_phases;    /**< dump the IR graph after all phases */
  56         bool statistic;     /**< Firm statistic setting */
  57         bool stat_pattern;  /**< enable Firm statistic pattern */
  58         bool stat_dag;      /**< enable Firm DAG statistic */
  59 };
  60
  61 struct a_firm_be_opt {
  62         bool selection;
  63         bool node_stat;
  64 };
  65
  66 /* optimization settings */
  67 static struct a_firm_opt firm_opt = {
  68         .const_folding    =  true,
  69         .cse              =  true,
  70         .confirm          =  true,
  71         .muls             =  true,
  72         .divs             =  true,
  73         .mods             =  true,
  74         .alias_analysis   =  true,
  75         .strict_alias     =  false,
  76         .no_alias         =  false,
  77         .verify           =  FIRM_VERIFICATION_ON,
  78         .check_all        =  true,
  79         .clone_threshold  =  DEFAULT_CLONE_THRESHOLD,
  80         .inline_maxsize   =  750,
  81         .inline_threshold =  0,
  82 };
  83
  84 /* dumping options */
  85 static struct a_firm_dump firm_dump = {
  86         .debug_print  = false,
  87         .all_types    = false,
  88         .ir_graph     = false,
  89         .all_phases   = false,
  90         .statistic    = STAT_NONE,
  91         .stat_pattern = 0,
  92         .stat_dag     = 0,
  93 };
  94
  95 #define X(a)  a, sizeof(a)-1
  96
  97 /** Parameter description structure */
  98 static const struct params {
  99   const char *option;      /**< name of the option */
 100   size_t     opt_len;      /**< length of the option string */
 101   bool       *flag;        /**< address of variable to set/reset */
 102   bool       set;          /**< iff true, variable will be set, else reset */
 103   const char *description; /**< description of this option */
 104 } firm_options[] = {
 105   /* firm optimization options */
 106   { X("no-opt"),                 NULL,                       0, "disable all FIRM optimizations" },
 107   { X("cse"),                    &firm_opt.cse,              1, "enable common subexpression elimination" },
 108   { X("no-cse"),                 &firm_opt.cse,              0, "disable common subexpression elimination" },
 109   { X("const-fold"),             &firm_opt.const_folding,    1, "enable constant folding" },
 110   { X("no-const-fold"),          &firm_opt.const_folding,    0, "disable constant folding" },
 111   { X("inline-max-size=<size>"), NULL,                       0, "set maximum size for function inlining" },
 112   { X("inline-threshold=<size>"),NULL,                       0, "set benefice threshold for function inlining" },
 113   { X("confirm"),                &firm_opt.confirm,          1, "enable Confirm optimization" },
 114   { X("no-confirm"),             &firm_opt.confirm,          0, "disable Confirm optimization" },
 115   { X("opt-mul"),                &firm_opt.muls,             0, "enable multiplication optimization" },
 116   { X("no-opt-mul"),             &firm_opt.muls,             0, "disable multiplication optimization" },
 117   { X("opt-div"),                &firm_opt.divs,             0, "enable division optimization" },
 118   { X("no-opt-div"),             &firm_opt.divs,             0, "disable division optimization" },
 119   { X("opt-mod"),                &firm_opt.mods,             0, "enable remainder optimization" },
 120   { X("no-opt-mod"),             &firm_opt.mods,             0, "disable remainder optimization" },
 121   { X("opt-alias"),              &firm_opt.alias_analysis,   1, "enable alias analysis" },
 122   { X("no-opt-alias"),           &firm_opt.alias_analysis,   0, "disable alias analysis" },
 123   { X("alias"),                  &firm_opt.no_alias,         0, "aliasing occurs" },
 124   { X("no-alias"),               &firm_opt.no_alias,         1, "no aliasing occurs" },
 125   { X("strict-aliasing"),        &firm_opt.strict_alias,     1, "strict alias rules" },
 126   { X("no-strict-aliasing"),     &firm_opt.strict_alias,     0, "strict alias rules" },
 127   { X("clone-threshold=<value>"),NULL,                       0, "set clone threshold to <value>" },
 128
 129   /* other firm regarding options */
 130   { X("verify-off"),             &firm_opt.verify,           FIRM_VERIFICATION_OFF,    "disable node verification" },
 131   { X("verify-on"),              &firm_opt.verify,           FIRM_VERIFICATION_ON,     "enable node verification" },
 132   { X("verify-report"),          &firm_opt.verify,           FIRM_VERIFICATION_REPORT, "node verification, report only" },
 133
 134   /* dumping */
 135   { X("dump-ir"),                &firm_dump.ir_graph,        1, "dump IR graph" },
 136   { X("dump-all-types"),         &firm_dump.all_types,       1, "dump graph of all types" },
 137   { X("dump-all-phases"),        &firm_dump.all_phases,      1, "dump graphs for all optimization phases" },
 138   { X("dump-filter=<string>"),   NULL,                       0, "set dumper filter" },
 139
 140   /* misc */
 141   { X("stat-before-opt"),        &firm_dump.statistic,       STAT_BEFORE_OPT,  "Firm statistic output before optimizations" },
 142   { X("stat-after-opt"),         &firm_dump.statistic,       STAT_AFTER_OPT,   "Firm statistic output after optimizations" },
 143   { X("stat-after-lower"),       &firm_dump.statistic,       STAT_AFTER_LOWER, "Firm statistic output after lowering" },
 144   { X("stat-final-ir"),          &firm_dump.statistic,       STAT_FINAL_IR,    "Firm statistic after final optimization" },
 145   { X("stat-final"),             &firm_dump.statistic,       STAT_FINAL,       "Firm statistic after code generation" },
 146   { X("stat-pattern"),           &firm_dump.stat_pattern,    1, "Firm statistic calculates most used pattern" },
 147   { X("stat-dag"),               &firm_dump.stat_dag,        1, "Firm calculates DAG statistics" },
 148 };
 149
 150 #undef X
 151
 152 static ir_timer_t *t_vcg_dump;
 153 static ir_timer_t *t_verify;
 154 static ir_timer_t *t_all_opt;
 155 static ir_timer_t *t_backend;
 156 static bool do_irg_opt(ir_graph *irg, const char *name);
 157
 158 /** dump all the graphs depending on cond */
 159
 160 static void dump_all(const char *suffix)
 161 {
 162         if (!firm_dump.ir_graph)
 163                 return;
 164
 165         timer_push(t_vcg_dump);
 166         dump_all_ir_graphs(suffix);
 167         timer_pop(t_vcg_dump);
 168 }
 169
 170 /* entities of runtime functions */
 171 ir_entity *rts_entities[rts_max];
 172
 173 /**
 174  * Map runtime functions.
 175  */
 176 static void rts_map(void)
 177 {
 178         static const struct {
 179                 ir_entity   **ent; /**< address of the rts entity */
 180                 i_mapper_func func; /**< mapper function. */
 181         } mapper[] = {
 182                 /* integer */
 183                 { &rts_entities[rts_abs],     i_mapper_abs },
 184                 { &rts_entities[rts_labs],    i_mapper_abs },
 185                 { &rts_entities[rts_llabs],   i_mapper_abs },
 186                 { &rts_entities[rts_imaxabs], i_mapper_abs },
 187
 188                 /* double -> double */
 189                 { &rts_entities[rts_fabs],    i_mapper_abs },
 190                 { &rts_entities[rts_sqrt],    i_mapper_sqrt },
 191                 { &rts_entities[rts_cbrt],    i_mapper_cbrt },
 192                 { &rts_entities[rts_pow],     i_mapper_pow },
 193                 { &rts_entities[rts_exp],     i_mapper_exp },
 194                 { &rts_entities[rts_exp2],    i_mapper_exp },
 195                 { &rts_entities[rts_exp10],   i_mapper_exp },
 196                 { &rts_entities[rts_log],     i_mapper_log },
 197                 { &rts_entities[rts_log2],    i_mapper_log2 },
 198                 { &rts_entities[rts_log10],   i_mapper_log10 },
 199                 { &rts_entities[rts_sin],     i_mapper_sin },
 200                 { &rts_entities[rts_cos],     i_mapper_cos },
 201                 { &rts_entities[rts_tan],     i_mapper_tan },
 202                 { &rts_entities[rts_asin],    i_mapper_asin },
 203                 { &rts_entities[rts_acos],    i_mapper_acos },
 204                 { &rts_entities[rts_atan],    i_mapper_atan },
 205                 { &rts_entities[rts_sinh],    i_mapper_sinh },
 206                 { &rts_entities[rts_cosh],    i_mapper_cosh },
 207                 { &rts_entities[rts_tanh],    i_mapper_tanh },
 208
 209                 /* float -> float */
 210                 { &rts_entities[rts_fabsf],   i_mapper_abs },
 211                 { &rts_entities[rts_sqrtf],   i_mapper_sqrt },
 212                 { &rts_entities[rts_cbrtf],   i_mapper_cbrt },
 213                 { &rts_entities[rts_powf],    i_mapper_pow },
 214                 { &rts_entities[rts_expf],    i_mapper_exp },
 215                 { &rts_entities[rts_exp2f],   i_mapper_exp },
 216                 { &rts_entities[rts_exp10f],  i_mapper_exp },
 217                 { &rts_entities[rts_logf],    i_mapper_log },
 218                 { &rts_entities[rts_log2f],   i_mapper_log2 },
 219                 { &rts_entities[rts_log10f],  i_mapper_log10 },
 220                 { &rts_entities[rts_sinf],    i_mapper_sin },
 221                 { &rts_entities[rts_cosf],    i_mapper_cos },
 222                 { &rts_entities[rts_tanf],    i_mapper_tan },
 223                 { &rts_entities[rts_asinf],   i_mapper_asin },
 224                 { &rts_entities[rts_acosf],   i_mapper_acos },
 225                 { &rts_entities[rts_atanf],   i_mapper_atan },
 226                 { &rts_entities[rts_sinhf],   i_mapper_sinh },
 227                 { &rts_entities[rts_coshf],   i_mapper_cosh },
 228                 { &rts_entities[rts_tanhf],   i_mapper_tanh },
 229
 230                 /* long double -> long double */
 231                 { &rts_entities[rts_fabsl],   i_mapper_abs },
 232                 { &rts_entities[rts_sqrtl],   i_mapper_sqrt },
 233                 { &rts_entities[rts_cbrtl],   i_mapper_cbrt },
 234                 { &rts_entities[rts_powl],    i_mapper_pow },
 235                 { &rts_entities[rts_expl],    i_mapper_exp },
 236                 { &rts_entities[rts_exp2l],   i_mapper_exp },
 237                 { &rts_entities[rts_exp10l],  i_mapper_exp },
 238                 { &rts_entities[rts_logl],    i_mapper_log },
 239                 { &rts_entities[rts_log2l],   i_mapper_log2 },
 240                 { &rts_entities[rts_log10l],  i_mapper_log10 },
 241                 { &rts_entities[rts_sinl],    i_mapper_sin },
 242                 { &rts_entities[rts_cosl],    i_mapper_cos },
 243                 { &rts_entities[rts_tanl],    i_mapper_tan },
 244                 { &rts_entities[rts_asinl],   i_mapper_asin },
 245                 { &rts_entities[rts_acosl],   i_mapper_acos },
 246                 { &rts_entities[rts_atanl],   i_mapper_atan },
 247                 { &rts_entities[rts_sinhl],   i_mapper_sinh },
 248                 { &rts_entities[rts_coshl],   i_mapper_cosh },
 249                 { &rts_entities[rts_tanhl],   i_mapper_tanh },
 250
 251                 /* string */
 252                 { &rts_entities[rts_strcmp],  i_mapper_strcmp },
 253                 { &rts_entities[rts_strncmp], i_mapper_strncmp },
 254                 { &rts_entities[rts_strcpy],  i_mapper_strcpy },
 255                 { &rts_entities[rts_strlen],  i_mapper_strlen },
 256                 { &rts_entities[rts_memcpy],  i_mapper_memcpy },
 257                 { &rts_entities[rts_mempcpy], i_mapper_mempcpy },
 258                 { &rts_entities[rts_memmove], i_mapper_memmove },
 259                 { &rts_entities[rts_memset],  i_mapper_memset },
 260                 { &rts_entities[rts_memcmp],  i_mapper_memcmp }
 261         };
 262         i_record rec[lengthof(mapper)];
 263         size_t   n_map = 0;
 264
 265         for (size_t i = 0; i != lengthof(mapper); ++i) {
 266                 if (*mapper[i].ent != NULL) {
 267                         rec[n_map].i_call.kind     = INTRINSIC_CALL;
 268                         rec[n_map].i_call.i_ent    = *mapper[i].ent;
 269                         rec[n_map].i_call.i_mapper = mapper[i].func;
 270                         rec[n_map].i_call.ctx      = NULL;
 271                         rec[n_map].i_call.link     = NULL;
 272                         ++n_map;
 273                 }
 274         }
 275
 276         if (n_map > 0)
 277                 lower_intrinsics(rec, n_map, /* part_block_used=*/0);
 278 }
 279
 280 static int *irg_dump_no;
 281
 282 typedef enum opt_target {
 283         OPT_TARGET_IRG, /**< optimization function works on a single graph */
 284         OPT_TARGET_IRP  /**< optimization function works on the complete program */
 285 } opt_target_t;
 286
 287 typedef enum opt_flags {
 288         OPT_FLAG_NONE         = 0,
 289         OPT_FLAG_ENABLED      = 1 << 0, /**< enable the optimization */
 290         OPT_FLAG_NO_DUMP      = 1 << 1, /**< don't dump after transformation */
 291         OPT_FLAG_NO_VERIFY    = 1 << 2, /**< don't verify after transformation */
 292         OPT_FLAG_HIDE_OPTIONS = 1 << 3, /**< do not automatically process
 293                                              -foptions for this transformation */
 294         OPT_FLAG_ESSENTIAL    = 1 << 4, /**< output won't work without this pass
 295                                              so we need it even with -O0 */
 296 } opt_flags_t;
 297
 298 typedef void (*transform_irg_func)(ir_graph *irg);
 299 typedef void (*transform_irp_func)(void);
 300
 301 typedef struct {
 302         opt_target_t  target;
 303         const char   *name;
 304         union {
 305                 transform_irg_func transform_irg;
 306                 transform_irp_func transform_irp;
 307         } u;
 308         const char   *description;
 309         opt_flags_t   flags;
 310         ir_timer_t   *timer;
 311 } opt_config_t;
 312
 313 static opt_config_t *get_opt(const char *name);
 314
 315 static void do_stred(ir_graph *irg)
 316 {
 317         opt_osr(irg, osr_flag_default | osr_flag_keep_reg_pressure | osr_flag_ignore_x86_shift);
 318 }
 319
 320 static void after_inline_opt(ir_graph *irg)
 321 {
 322         opt_config_t *const config = get_opt("inline");
 323         timer_stop(config->timer);
 324
 325         do_irg_opt(irg, "scalar-replace");
 326         do_irg_opt(irg, "local");
 327         do_irg_opt(irg, "control-flow");
 328         do_irg_opt(irg, "combo");
 329
 330         timer_start(config->timer);
 331 }
 332
 333 static void do_inline(void)
 334 {
 335         inline_functions(firm_opt.inline_maxsize, firm_opt.inline_threshold,
 336                          after_inline_opt);
 337 }
 338
 339 static void do_cloning(void)
 340 {
 341         proc_cloning((float) firm_opt.clone_threshold);
 342 }
 343
 344 static void do_lower_mux(ir_graph *irg)
 345 {
 346         lower_mux(irg, NULL);
 347 }
 348
 349 static void do_gcse(ir_graph *irg)
 350 {
 351         set_opt_global_cse(1);
 352         optimize_graph_df(irg);
 353         set_opt_global_cse(0);
 354 }
 355
 356 static opt_config_t opts[] = {
 357 #define IRG(a, b, c, d) { OPT_TARGET_IRG, a, .u.transform_irg = (transform_irg_func)b, c, d }
 358 #define IRP(a, b, c, d) { OPT_TARGET_IRP, a, .u.transform_irp = b,                     c, d }
 359         IRG("bool",              opt_bool,                 "bool simplification",                                   OPT_FLAG_NONE),
 360         IRG("combo",             combo,                    "combined CCE, UCE and GVN",                             OPT_FLAG_NONE),
 361         IRG("confirm",           construct_confirms,       "confirm optimization",                                  OPT_FLAG_HIDE_OPTIONS),
 362         IRG("control-flow",      optimize_cf,              "optimization of control-flow",                          OPT_FLAG_HIDE_OPTIONS),
 363         IRG("dead",              dead_node_elimination,    "dead node elimination",                                 OPT_FLAG_HIDE_OPTIONS | OPT_FLAG_NO_DUMP | OPT_FLAG_NO_VERIFY),
 364         IRG("deconv",            conv_opt,                 "conv node elimination",                                 OPT_FLAG_NONE),
 365         IRG("fp-vrp",            fixpoint_vrp,             "fixpoint value range propagation",                      OPT_FLAG_NONE),
 366         IRG("frame",             opt_frame_irg,            "remove unused frame entities",                          OPT_FLAG_NONE),
 367         IRG("gvn-pre",           do_gvn_pre,               "global value numbering partial redundancy elimination", OPT_FLAG_NONE),
 368         IRG("if-conversion",     opt_if_conv,              "if-conversion",                                         OPT_FLAG_NONE),
 369         IRG("invert-loops",      do_loop_inversion,        "loop inversion",                                        OPT_FLAG_NONE),
 370         IRG("ivopts",            do_stred,                 "induction variable strength reduction",                 OPT_FLAG_NONE),
 371         IRG("local",             local_opts,               "local graph optimizations",                             OPT_FLAG_HIDE_OPTIONS),
 372         IRG("lower",             lower_highlevel_graph,    "lowering",                                              OPT_FLAG_HIDE_OPTIONS | OPT_FLAG_ESSENTIAL),
 373         IRG("lower-mux",         do_lower_mux,             "mux lowering",                                          OPT_FLAG_NONE),
 374         IRG("opt-load-store",    optimize_load_store,      "load store optimization",                               OPT_FLAG_NONE),
 375         IRG("opt-tail-rec",      opt_tail_rec_irg,         "tail-recursion eliminiation",                           OPT_FLAG_NONE),
 376         IRG("parallelize-mem",   opt_parallelize_mem,      "parallelize memory",                                    OPT_FLAG_NONE),
 377         IRG("gcse",              do_gcse,                  "global common subexpression eliminiation",              OPT_FLAG_NONE),
 378         IRG("place",             place_code,               "code placement",                                        OPT_FLAG_NONE),
 379         IRG("reassociation",     optimize_reassociation,   "reassociation",                                         OPT_FLAG_NONE),
 380         IRG("remove-confirms",   remove_confirms,          "confirm removal",                                       OPT_FLAG_HIDE_OPTIONS | OPT_FLAG_NO_DUMP | OPT_FLAG_NO_VERIFY),
 381         IRG("remove-phi-cycles", remove_phi_cycles,        "removal of phi cycles",                                 OPT_FLAG_HIDE_OPTIONS),
 382         IRG("scalar-replace",    scalar_replacement_opt,   "scalar replacement",                                    OPT_FLAG_NONE),
 383         IRG("shape-blocks",      shape_blocks,             "block shaping",                                         OPT_FLAG_NONE),
 384         IRG("thread-jumps",      opt_jumpthreading,        "path-sensitive jumpthreading",                          OPT_FLAG_NONE),
 385         IRG("unroll-loops",      do_loop_unrolling,        "loop unrolling",                                        OPT_FLAG_NONE),
 386         IRG("vrp",               set_vrp_data,             "value range propagation",                               OPT_FLAG_NONE),
 387         IRP("inline",            do_inline,                "inlining",                                              OPT_FLAG_NONE),
 388         IRP("lower-const",       lower_const_code,         "lowering of constant code",                             OPT_FLAG_HIDE_OPTIONS | OPT_FLAG_NO_DUMP | OPT_FLAG_NO_VERIFY | OPT_FLAG_ESSENTIAL),
 389         IRP("local-const",       local_opts_const_code,    "local optimisation of constant initializers",
 390                                     OPT_FLAG_HIDE_OPTIONS | OPT_FLAG_NO_DUMP | OPT_FLAG_NO_VERIFY | OPT_FLAG_ESSENTIAL),
 391         IRP("target-lowering",   be_lower_for_target,      "lowering necessary for target architecture",            OPT_FLAG_HIDE_OPTIONS | OPT_FLAG_ESSENTIAL),
 392         IRP("opt-func-call",     optimize_funccalls,       "function call optimization",                            OPT_FLAG_NONE),
 393         IRP("opt-proc-clone",    do_cloning,               "procedure cloning",                                     OPT_FLAG_NONE),
 394         IRP("remove-unused",     garbage_collect_entities, "removal of unused functions/variables",                 OPT_FLAG_NO_DUMP | OPT_FLAG_NO_VERIFY),
 395         IRP("rts",               rts_map,                  "optimization of known library functions",               OPT_FLAG_NONE),
 396         IRP("opt-cc",            mark_private_methods,     "calling conventions optimization",                      OPT_FLAG_NONE),
 397 #undef IRP
 398 #undef IRG
 399 };
 400
 401 #define FOR_EACH_OPT(i) for (opt_config_t *i = opts; i != endof(opts); ++i)
 402
 403 static opt_config_t *get_opt(const char *name)
 404 {
 405         FOR_EACH_OPT(config) {
 406                 if (streq(config->name, name))
 407                         return config;
 408         }
 409
 410         return NULL;
 411 }
 412
 413 static void set_opt_enabled(const char *name, bool enabled)
 414 {
 415         opt_config_t *config = get_opt(name);
 416         config->flags = (config->flags & ~OPT_FLAG_ENABLED)
 417                 | (enabled ? OPT_FLAG_ENABLED : 0);
 418 }
 419
 420 static bool get_opt_enabled(const char *name)
 421 {
 422         opt_config_t *config = get_opt(name);
 423         return (config->flags & OPT_FLAG_ENABLED) != 0;
 424 }
 425
 426 /**
 427  * perform an optimization on a single graph
 428  *
 429  * @return  true if something changed, false otherwise
 430  */
 431 static bool do_irg_opt(ir_graph *irg, const char *name)
 432 {
 433         opt_config_t *const config = get_opt(name);
 434         assert(config != NULL);
 435         assert(config->target == OPT_TARGET_IRG);
 436         if (! (config->flags & OPT_FLAG_ENABLED))
 437                 return false;
 438
 439         ir_graph *const old_irg = current_ir_graph;
 440         current_ir_graph = irg;
 441
 442         timer_start(config->timer);
 443         config->u.transform_irg(irg);
 444         timer_stop(config->timer);
 445
 446         if (firm_dump.all_phases && firm_dump.ir_graph) {
 447                 dump_ir_graph(irg, name);
 448         }
 449
 450         if (firm_opt.verify) {
 451                 timer_push(t_verify);
 452                 irg_verify(irg, VERIFY_ENFORCE_SSA);
 453                 timer_pop(t_verify);
 454         }
 455
 456         current_ir_graph = old_irg;
 457         return true;
 458 }
 459
 460 static void do_irp_opt(const char *name)
 461 {
 462         opt_config_t *const config = get_opt(name);
 463         assert(config->target == OPT_TARGET_IRP);
 464         if (! (config->flags & OPT_FLAG_ENABLED))
 465                 return;
 466
 467         timer_start(config->timer);
 468         config->u.transform_irp();
 469         timer_stop(config->timer);
 470
 471         if (firm_dump.ir_graph && firm_dump.all_phases) {
 472                 int i;
 473                 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
 474                         ir_graph *irg = get_irp_irg(i);
 475                         dump_ir_graph(irg, name);
 476                 }
 477         }
 478
 479         if (firm_opt.verify) {
 480                 int i;
 481                 timer_push(t_verify);
 482                 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
 483                         irg_verify(get_irp_irg(i), VERIFY_ENFORCE_SSA);
 484                 }
 485                 timer_pop(t_verify);
 486         }
 487 }
 488
 489 /**
 490  * Enable transformations which should be always safe (and cheap) to perform
 491  */
 492 static void enable_safe_defaults(void)
 493 {
 494         set_opt_enabled("remove-unused", true);
 495         set_opt_enabled("opt-tail-rec", true);
 496         set_opt_enabled("opt-func-call", true);
 497         set_opt_enabled("reassociation", true);
 498         set_opt_enabled("control-flow", true);
 499         set_opt_enabled("local", true);
 500         set_opt_enabled("lower-const", true);
 501         set_opt_enabled("local-const", true);
 502         set_opt_enabled("scalar-replace", true);
 503         set_opt_enabled("place", true);
 504         set_opt_enabled("gcse", true);
 505         set_opt_enabled("confirm", true);
 506         set_opt_enabled("opt-load-store", true);
 507         set_opt_enabled("lower", true);
 508         set_opt_enabled("deconv", true);
 509         set_opt_enabled("remove-confirms", true);
 510         set_opt_enabled("ivopts", true);
 511         set_opt_enabled("dead", true);
 512         set_opt_enabled("remove-phi-cycles", true);
 513         set_opt_enabled("frame", true);
 514         set_opt_enabled("combo", true);
 515         set_opt_enabled("invert-loops", true);
 516         set_opt_enabled("target-lowering", true);
 517         set_opt_enabled("rts", true);
 518         set_opt_enabled("parallelize-mem", true);
 519         set_opt_enabled("opt-cc", true);
 520 }
 521
 522 /**
 523  * run all the Firm optimizations
 524  *
 525  * @param input_filename     the name of the (main) source file
 526  */
 527 static void do_firm_optimizations(const char *input_filename)
 528 {
 529         size_t   i;
 530         unsigned aa_opt;
 531
 532         set_opt_alias_analysis(firm_opt.alias_analysis);
 533
 534         aa_opt = aa_opt_no_opt;
 535         if (firm_opt.strict_alias)
 536                 aa_opt |= aa_opt_type_based | aa_opt_byte_type_may_alias;
 537         if (firm_opt.no_alias)
 538                 aa_opt = aa_opt_no_alias;
 539
 540         set_irp_memory_disambiguator_options(aa_opt);
 541
 542         /* parameter passing code should set them directly sometime... */
 543         set_opt_enabled("confirm", firm_opt.confirm);
 544         set_opt_enabled("remove-confirms", firm_opt.confirm);
 545
 546         /* osr supersedes remove_phi_cycles */
 547         if (get_opt_enabled("ivopts"))
 548                 set_opt_enabled("remove-phi-cycles", false);
 549
 550         do_irp_opt("rts");
 551
 552         /* first step: kill dead code */
 553         for (i = 0; i < get_irp_n_irgs(); i++) {
 554                 ir_graph *irg = get_irp_irg(i);
 555                 do_irg_opt(irg, "combo");
 556                 do_irg_opt(irg, "local");
 557                 do_irg_opt(irg, "control-flow");
 558         }
 559
 560         do_irp_opt("remove-unused");
 561         for (i = 0; i < get_irp_n_irgs(); ++i) {
 562                 ir_graph *irg = get_irp_irg(i);
 563                 do_irg_opt(irg, "opt-tail-rec");
 564         }
 565         do_irp_opt("opt-func-call");
 566         do_irp_opt("lower-const");
 567
 568         for (i = 0; i < get_irp_n_irgs(); i++) {
 569                 ir_graph *irg = get_irp_irg(i);
 570
 571                 do_irg_opt(irg, "scalar-replace");
 572                 do_irg_opt(irg, "invert-loops");
 573                 do_irg_opt(irg, "unroll-loops");
 574                 do_irg_opt(irg, "local");
 575                 do_irg_opt(irg, "reassociation");
 576                 do_irg_opt(irg, "local");
 577                 do_irg_opt(irg, "gcse");
 578                 do_irg_opt(irg, "place");
 579
 580                 if (firm_opt.confirm) {
 581                         /* Confirm construction currently can only handle blocks with only
 582                            one control flow predecessor. Calling optimize_cf here removes
 583                            Bad predecessors and help the optimization of switch constructs.
 584                          */
 585                         do_irg_opt(irg, "control-flow");
 586                         do_irg_opt(irg, "confirm");
 587                         do_irg_opt(irg, "vrp");
 588                         do_irg_opt(irg, "local");
 589                 }
 590
 591                 do_irg_opt(irg, "control-flow");
 592                 do_irg_opt(irg, "opt-load-store");
 593                 do_irg_opt(irg, "fp-vrp");
 594                 do_irg_opt(irg, "lower");
 595                 do_irg_opt(irg, "deconv");
 596                 do_irg_opt(irg, "thread-jumps");
 597                 do_irg_opt(irg, "remove-confirms");
 598                 do_irg_opt(irg, "gvn-pre");
 599                 do_irg_opt(irg, "gcse");
 600                 do_irg_opt(irg, "place");
 601                 do_irg_opt(irg, "control-flow");
 602
 603                 if (do_irg_opt(irg, "if-conversion")) {
 604                         do_irg_opt(irg, "local");
 605                         do_irg_opt(irg, "control-flow");
 606                 }
 607                 /* this doesn't make too much sense but tests the mux destruction... */
 608                 do_irg_opt(irg, "lower-mux");
 609
 610                 do_irg_opt(irg, "bool");
 611                 do_irg_opt(irg, "shape-blocks");
 612                 do_irg_opt(irg, "ivopts");
 613                 do_irg_opt(irg, "local");
 614                 do_irg_opt(irg, "dead");
 615         }
 616
 617         do_irp_opt("inline");
 618         do_irp_opt("opt-proc-clone");
 619
 620         for (i = 0; i < get_irp_n_irgs(); i++) {
 621                 ir_graph *irg = get_irp_irg(i);
 622                 do_irg_opt(irg, "local");
 623                 do_irg_opt(irg, "control-flow");
 624                 do_irg_opt(irg, "thread-jumps");
 625                 do_irg_opt(irg, "local");
 626                 do_irg_opt(irg, "control-flow");
 627
 628                 if( do_irg_opt(irg, "vrp") ) { // if vrp is enabled
 629                         do_irg_opt(irg, "local");
 630                         do_irg_opt(irg, "vrp");
 631                         do_irg_opt(irg, "local");
 632                         do_irg_opt(irg, "vrp");
 633                 }
 634         }
 635
 636         if (firm_dump.ir_graph) {
 637                 /* recompute backedges for nicer dumps */
 638                 for (i = 0; i < get_irp_n_irgs(); i++)
 639                         construct_cf_backedges(get_irp_irg(i));
 640         }
 641
 642         dump_all("opt");
 643
 644         if (firm_dump.statistic & STAT_AFTER_OPT)
 645                 stat_dump_snapshot(input_filename, "opt");
 646 }
 647
 648 /**
 649  * do Firm lowering
 650  *
 651  * @param input_filename  the name of the (main) source file
 652  */
 653 static void do_firm_lowering(const char *input_filename)
 654 {
 655         int i;
 656
 657         /* enable architecture dependent optimizations */
 658         arch_dep_set_opts((arch_dep_opts_t)
 659                         ((firm_opt.muls ? arch_dep_mul_to_shift : arch_dep_none) |
 660                          (firm_opt.divs ? arch_dep_div_by_const : arch_dep_none) |
 661                          (firm_opt.mods ? arch_dep_mod_by_const : arch_dep_none) ));
 662         for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
 663                 ir_graph *irg = get_irp_irg(i);
 664                 do_irg_opt(irg, "reassociation");
 665                 do_irg_opt(irg, "local");
 666         }
 667
 668         do_irp_opt("target-lowering");
 669
 670         if (firm_dump.statistic & STAT_AFTER_LOWER)
 671                 stat_dump_snapshot(input_filename, "low");
 672
 673         for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
 674                 ir_graph *irg = get_irp_irg(i);
 675
 676                 do_irg_opt(irg, "local");
 677                 do_irg_opt(irg, "deconv");
 678                 do_irg_opt(irg, "control-flow");
 679                 do_irg_opt(irg, "opt-load-store");
 680                 do_irg_opt(irg, "gcse");
 681                 do_irg_opt(irg, "place");
 682                 do_irg_opt(irg, "control-flow");
 683
 684                 if (do_irg_opt(irg, "vrp")) {
 685                         do_irg_opt(irg, "local");
 686                         do_irg_opt(irg, "control-flow");
 687                         do_irg_opt(irg, "vrp");
 688                         do_irg_opt(irg, "local");
 689                         do_irg_opt(irg, "control-flow");
 690                 }
 691
 692                 if (do_irg_opt(irg, "if-conversion")) {
 693                         do_irg_opt(irg, "local");
 694                         do_irg_opt(irg, "control-flow");
 695                 }
 696
 697                 add_irg_constraints(irg, IR_GRAPH_CONSTRAINT_NORMALISATION2);
 698                 do_irg_opt(irg, "local");
 699
 700                 do_irg_opt(irg, "parallelize-mem");
 701                 do_irg_opt(irg, "frame");
 702         }
 703         do_irp_opt("local-const");
 704         do_irp_opt("remove-unused");
 705         do_irp_opt("opt-cc");
 706         dump_all("low-opt");
 707
 708         if (firm_dump.statistic & STAT_FINAL) {
 709                 stat_dump_snapshot(input_filename, "final");
 710         }
 711 }
 712
 713 /**
 714  * Initialize for the Firm-generating back end.
 715  */
 716 void gen_firm_init(void)
 717 {
 718         ir_init();
 719         enable_safe_defaults();
 720
 721         FOR_EACH_OPT(i) {
 722                 i->timer = ir_timer_new();
 723                 timer_register(i->timer, i->description);
 724         }
 725         t_verify = ir_timer_new();
 726         timer_register(t_verify, "Firm: verify pass");
 727         t_vcg_dump = ir_timer_new();
 728         timer_register(t_vcg_dump, "Firm: vcg dumping");
 729         t_all_opt = ir_timer_new();
 730         timer_register(t_all_opt, "Firm: all optimizations");
 731         t_backend = ir_timer_new();
 732         timer_register(t_backend, "Firm: backend");
 733 }
 734
 735 static void init_statistics(void)
 736 {
 737         unsigned pattern = 0;
 738
 739         if (firm_dump.stat_pattern)
 740                 pattern |= FIRMSTAT_PATTERN_ENABLED;
 741
 742         if (firm_dump.stat_dag)
 743                 pattern |= FIRMSTAT_COUNT_DAG;
 744
 745         firm_init_stat(firm_dump.statistic == STAT_NONE ?
 746                         0 : FIRMSTAT_ENABLED | FIRMSTAT_COUNT_STRONG_OP
 747                         | FIRMSTAT_COUNT_CONSTS | pattern);
 748 }
 749
 750 /**
 751  * Called, after the Firm generation is completed,
 752  * do all optimizations and backend call here.
 753  *
 754  * @param out                a file handle for the output, may be NULL
 755  * @param input_filename     the name of the (main) source file
 756  */
 757 void generate_code(FILE *out, const char *input_filename)
 758 {
 759         int i;
 760
 761         /* initialize implicit opts, just to be sure because really the frontend
 762          * should have called it already before starting graph construction */
 763         init_implicit_optimizations();
 764         init_statistics();
 765
 766         do_node_verification((firm_verification_t) firm_opt.verify);
 767
 768         /* the general for dumping option must be set, or the others will not work*/
 769         firm_dump.ir_graph = (bool) (firm_dump.ir_graph | firm_dump.all_phases);
 770
 771         ir_add_dump_flags(ir_dump_flag_keepalive_edges
 772                         | ir_dump_flag_consts_local | ir_dump_flag_dominance);
 773         ir_remove_dump_flags(ir_dump_flag_loops | ir_dump_flag_ld_names);
 774
 775         /* FIXME: cloning might ADD new graphs. */
 776         irg_dump_no = calloc(get_irp_last_idx(), sizeof(*irg_dump_no));
 777
 778         ir_timer_init_parent(t_verify);
 779         ir_timer_init_parent(t_vcg_dump);
 780         timer_start(t_all_opt);
 781
 782         if (firm_dump.all_types) {
 783                 dump_ir_prog_ext(dump_typegraph, "types.vcg");
 784         }
 785
 786         dump_all("");
 787
 788         if (firm_opt.verify) {
 789                 timer_push(t_verify);
 790                 tr_verify();
 791                 timer_pop(t_verify);
 792         }
 793
 794         /* BEWARE: kill unreachable code before doing compound lowering */
 795         for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
 796                 ir_graph *irg = get_irp_irg(i);
 797                 do_irg_opt(irg, "control-flow");
 798         }
 799
 800         if (firm_dump.statistic & STAT_BEFORE_OPT) {
 801                 stat_dump_snapshot(input_filename, "noopt");
 802         }
 803
 804         do_firm_optimizations(input_filename);
 805         do_firm_lowering(input_filename);
 806
 807         timer_stop(t_all_opt);
 808
 809         if (firm_dump.statistic & STAT_FINAL_IR)
 810                 stat_dump_snapshot(input_filename, "final-ir");
 811
 812         /* run the code generator */
 813         timer_start(t_backend);
 814         be_main(out, input_filename);
 815         timer_stop(t_backend);
 816
 817         if (firm_dump.statistic & STAT_FINAL)
 818                 stat_dump_snapshot(input_filename, "final");
 819 }
 820
 821 void gen_firm_finish(void)
 822 {
 823         ir_finish();
 824 }
 825
 826 static void disable_all_opts(void)
 827 {
 828         firm_opt.cse             = false;
 829         firm_opt.confirm         = false;
 830         firm_opt.muls            = false;
 831         firm_opt.divs            = false;
 832         firm_opt.mods            = false;
 833         firm_opt.alias_analysis  = false;
 834         firm_opt.strict_alias    = false;
 835         firm_opt.no_alias        = false;
 836         firm_opt.const_folding   = false;
 837
 838         FOR_EACH_OPT(config) {
 839                 if (config->flags & OPT_FLAG_ESSENTIAL) {
 840                         config->flags |= OPT_FLAG_ENABLED;
 841                 } else {
 842                         config->flags &= ~OPT_FLAG_ENABLED;
 843                 }
 844         }
 845 }
 846
 847 static bool firm_opt_option(const char *opt)
 848 {
 849         char const* const rest   = strstart(opt, "no-");
 850         bool        const enable = rest ? opt = rest, false : true;
 851
 852         opt_config_t *config = get_opt(opt);
 853         if (config == NULL || (config->flags & OPT_FLAG_HIDE_OPTIONS))
 854                 return false;
 855
 856         config->flags &= ~OPT_FLAG_ENABLED;
 857         config->flags |= enable ? OPT_FLAG_ENABLED : 0;
 858         return true;
 859 }
 860
 861 void firm_option_help(print_option_help_func print_option_help)
 862 {
 863         FOR_EACH_OPT(config) {
 864                 char buf[1024];
 865                 char buf2[1024];
 866
 867                 if (config->flags & OPT_FLAG_HIDE_OPTIONS)
 868                         continue;
 869
 870                 snprintf(buf, sizeof(buf), "-f%s", config->name);
 871                 snprintf(buf2, sizeof(buf2), "enable %s", config->description);
 872                 print_option_help(buf, buf2);
 873                 snprintf(buf, sizeof(buf), "-fno-%s", config->name);
 874                 snprintf(buf2, sizeof(buf2), "disable %s", config->description);
 875                 print_option_help(buf, buf2);
 876         }
 877
 878         for (size_t k = 0; k != lengthof(firm_options); ++k) {
 879                 char buf[1024];
 880                 char buf2[1024];
 881                 snprintf(buf, sizeof(buf), "-f%s", firm_options[k].option);
 882                 snprintf(buf2, sizeof(buf2), "%s", firm_options[k].description);
 883                 print_option_help(buf, buf2);
 884         }
 885 }
 886
 887 int firm_option(const char *const opt)
 888 {
 889         char const* val;
 890         if ((val = strstart(opt, "dump-filter="))) {
 891                 ir_set_dump_filter(val);
 892                 return 1;
 893         } else if ((val = strstart(opt, "clone-threshold="))) {
 894                 sscanf(val, "%d", &firm_opt.clone_threshold);
 895                 return 1;
 896         } else if ((val = strstart(opt, "inline-max-size="))) {
 897                 sscanf(val, "%u", &firm_opt.inline_maxsize);
 898                 return 1;
 899         } else if ((val = strstart(opt, "inline-threshold="))) {
 900                 sscanf(val, "%u", &firm_opt.inline_threshold);
 901                 return 1;
 902         } else if (streq(opt, "no-opt")) {
 903                 disable_all_opts();
 904                 return 1;
 905         }
 906
 907         size_t const len = strlen(opt);
 908         for (size_t i = lengthof(firm_options); i != 0;) {
 909                 struct params const* const o = &firm_options[--i];
 910                 if (len == o->opt_len && memcmp(opt, o->option, len) == 0) {
 911                         /* statistic options do accumulate */
 912                         if (o->flag == &firm_dump.statistic)
 913                                 *o->flag = (bool) (*o->flag | o->set);
 914                         else
 915                                 *o->flag = o->set;
 916
 917                         return 1;
 918                 }
 919         }
 920
 921         /* maybe this enables/disables optimizations */
 922         if (firm_opt_option(opt))
 923                 return 1;
 924
 925         return 0;
 926 }
 927
 928 static void set_be_option(const char *arg)
 929 {
 930         int res = be_parse_arg(arg);
 931         (void) res;
 932         assert(res);
 933 }
 934
 935 static void set_option(const char *arg)
 936 {
 937         int res = firm_option(arg);
 938         (void) res;
 939         assert(res);
 940 }
 941
 942 void choose_optimization_pack(int level)
 943 {
 944         /* apply optimization level */
 945         switch(level) {
 946         case 0:
 947                 set_option("no-opt");
 948                 break;
 949         case 1:
 950                 set_option("no-inline");
 951                 break;
 952         default:
 953         case 4:
 954                 /* use_builtins = true; */
 955                 /* fallthrough */
 956         case 3:
 957                 set_option("thread-jumps");
 958                 set_option("if-conversion");
 959                 /* fallthrough */
 960         case 2:
 961                 set_option("strict-aliasing");
 962                 set_option("inline");
 963                 set_option("fp-vrp");
 964                 set_option("deconv");
 965                 set_be_option("omitfp");
 966                 break;
 967         }
 968 }
 969
 970 void init_implicit_optimizations(void)
 971 {
 972         set_optimize(1);
 973         set_opt_constant_folding(firm_opt.const_folding);
 974         set_opt_algebraic_simplification(firm_opt.const_folding);
 975         set_opt_cse(firm_opt.cse);
 976         set_opt_global_cse(0);
 977 }