3 * @author Sebastian Hack
14 // FIXME remove me later
16 int fileno(FILE *stream);
17 int readlink(const char *path, char *buf, size_t bufsiz);
20 #include <libcore/lc_opts.h>
21 #include <libcore/lc_opts_enum.h>
22 #include <libcore/lc_timing.h>
23 #endif /* WITH_LIBCORE */
34 #include "iredges_t.h"
44 #include "firm/bearch_firm.h"
45 #include "ia32/bearch_ia32.h"
46 #include "arm/bearch_arm.h"
47 #include "ppc32/bearch_ppc32.h"
48 #include "mips/bearch_mips.h"
55 #include "besched_t.h"
56 #include "belistsched.h"
58 #include "bespillbelady.h"
60 #include "beraextern.h"
61 #include "bechordal_t.h"
63 #include "beifg_impl.h"
64 #include "becopyopt.h"
65 #include "becopystat.h"
66 #include "bessadestr.h"
69 #include "beschedmris.h"
72 #include "beprofile.h"
74 /* options visible for anyone */
75 static be_options_t be_options = {
76 DUMP_NONE, /* dump flags */
77 BE_TIME_OFF, /* no timing */
78 BE_SCHED_SELECT_HEUR, /* mueller heuristic selector */
79 0, /* no opt profile */
81 1, /* try to omit frame pointer */
82 BE_VRFY_WARN, /* verification level: warn */
83 "i44pc52.info.uni-karlsruhe.de", /* ilp server */
84 "cplex" /* ilp solver */
88 static char config_file[256] = { 0 };
90 /* register allocator to use. */
91 static const be_ra_t *ra = &be_ra_chordal_allocator;
93 /* back end instruction set architecture to use */
94 static const arch_isa_if_t *isa_if = &ia32_isa_if;
98 static lc_opt_entry_t *be_grp_root = NULL;
100 /* possible dumping options */
101 static const lc_opt_enum_mask_items_t dump_items[] = {
102 { "none", DUMP_NONE },
103 { "initial", DUMP_INITIAL },
105 { "sched", DUMP_SCHED },
106 { "prepared", DUMP_PREPARED },
107 { "regalloc", DUMP_RA },
108 { "final", DUMP_FINAL },
110 { "all", 2 * DUMP_BE - 1 },
114 /* register allocators */
115 static const lc_opt_enum_const_ptr_items_t ra_items[] = {
116 { "chordal", &be_ra_chordal_allocator },
117 { "external", &be_ra_external_allocator },
121 /* instruction set architectures. */
122 static const lc_opt_enum_const_ptr_items_t isa_items[] = {
123 { "ia32", &ia32_isa_if },
125 { "arm", &arm_isa_if },
126 { "ppc32", &ppc32_isa_if },
127 { "mips", &mips_isa_if },
132 /* verify options. */
133 static const lc_opt_enum_int_items_t vrfy_items[] = {
134 { "off", BE_VRFY_OFF },
135 { "warn", BE_VRFY_WARN },
136 { "assert", BE_VRFY_ASSERT },
140 /* schedule selector options. */
141 static const lc_opt_enum_int_items_t sched_select_items[] = {
142 { "trivial", BE_SCHED_SELECT_TRIVIAL },
143 { "regpress", BE_SCHED_SELECT_REGPRESS },
144 { "muchnik", BE_SCHED_SELECT_MUCHNIK },
145 { "heur", BE_SCHED_SELECT_HEUR },
146 { "hmuchnik", BE_SCHED_SELECT_HMUCHNIK },
150 static lc_opt_enum_mask_var_t dump_var = {
151 &be_options.dump_flags, dump_items
154 static lc_opt_enum_const_ptr_var_t ra_var = {
155 (const void **) &ra, ra_items
158 static lc_opt_enum_const_ptr_var_t isa_var = {
159 (const void **) &isa_if, isa_items
162 static lc_opt_enum_int_var_t vrfy_var = {
163 &be_options.vrfy_option, vrfy_items
166 static lc_opt_enum_int_var_t sched_select_var = {
167 &be_options.sched_select, sched_select_items
170 static const lc_opt_table_entry_t be_main_options[] = {
171 LC_OPT_ENT_STR ("config", "read another config file containing backend options", config_file, sizeof(config_file)),
172 LC_OPT_ENT_ENUM_MASK("dump", "dump irg on several occasions", &dump_var),
173 LC_OPT_ENT_ENUM_PTR ("ra", "register allocator", &ra_var),
174 LC_OPT_ENT_ENUM_PTR ("isa", "the instruction set architecture", &isa_var),
175 LC_OPT_ENT_NEGBOOL ("noomitfp", "do not omit frame pointer", &be_options.omit_fp),
176 LC_OPT_ENT_ENUM_PTR ("vrfy", "verify the backend irg (off, warn, assert)", &vrfy_var),
177 LC_OPT_ENT_BOOL ("time", "get backend timing statistics", &be_options.timing),
178 LC_OPT_ENT_BOOL ("profile", "instrument the code for execution count profiling", &be_options.opt_profile),
179 LC_OPT_ENT_BOOL ("sched.mris", "enable mris schedule preparation", &be_options.mris),
180 LC_OPT_ENT_ENUM_PTR ("sched.select", "schedule node selector (trivial, regpress, muchnik, heur, hmuchnik)", &sched_select_var),
183 LC_OPT_ENT_STR ("ilp.server", "the ilp server name", be_options.ilp_server, sizeof(be_options.ilp_server)),
184 LC_OPT_ENT_STR ("ilp.solver", "the ilp solver name", be_options.ilp_solver, sizeof(be_options.ilp_solver)),
185 #endif /* WITH_ILP */
189 #endif /* WITH_LIBCORE */
191 void be_opt_register(void)
195 lc_opt_entry_t *be_grp_ra;
196 static int run_once = 0;
200 be_grp_root = lc_opt_get_grp(firm_opt_get_root(), "be");
201 be_grp_ra = lc_opt_get_grp(be_grp_root, "ra");
203 lc_opt_add_table(be_grp_root, be_main_options);
205 /* register allocator options */
206 for(i = 0; ra_items[i].name != NULL; ++i) {
207 const be_ra_t *ra = ra_items[i].value;
208 ra->register_options(be_grp_ra);
211 /* register isa options */
212 for(i = 0; isa_items[i].name != NULL; ++i) {
213 const arch_isa_if_t *isa = isa_items[i].value;
214 isa->register_options(be_grp_root);
217 #endif /* WITH_LIBCORE */
220 /* Parse one argument. */
221 int be_parse_arg(const char *arg) {
223 if (strcmp(arg, "help") == 0 || (arg[0] == '?' && arg[1] == '\0')) {
224 lc_opt_print_help(be_grp_root, stdout);
227 return lc_opt_from_single_arg(be_grp_root, NULL, arg, NULL);
230 #endif /* WITH_LIBCORE */
233 /** The be parameters returned by default, all off. */
234 const static backend_params be_params = {
241 /* Perform schedule verification if requested. */
242 static void be_sched_vrfy(ir_graph *irg, int vrfy_opt) {
243 if (vrfy_opt == BE_VRFY_WARN) {
244 be_verify_schedule(irg);
246 else if (vrfy_opt == BE_VRFY_ASSERT) {
247 assert(be_verify_schedule(irg) && "Schedule verification failed.");
251 /* Initialize the Firm backend. Must be run BEFORE init_firm()! */
252 const backend_params *be_init(void)
262 if (isa_if->get_params)
263 return isa_if->get_params();
268 * Initializes the main environment for the backend.
270 * @param env an empty environment
271 * @param file_handle the file handle where the output will be written to
273 static be_main_env_t *be_init_env(be_main_env_t *env, FILE *file_handle)
275 memset(env, 0, sizeof(*env));
276 obstack_init(&env->obst);
277 env->arch_env = obstack_alloc(&env->obst, sizeof(env->arch_env[0]));
278 env->options = &be_options;
279 FIRM_DBG_REGISTER(env->dbg, "be.main");
281 arch_env_init(env->arch_env, isa_if, file_handle, env);
283 /* Register the irn handler of the architecture */
284 if (arch_isa_get_irn_handler(env->arch_env->isa))
285 arch_env_push_irn_handler(env->arch_env, arch_isa_get_irn_handler(env->arch_env->isa));
288 * Register the node handler of the back end infrastructure.
289 * This irn handler takes care of the platform independent
290 * spill, reload and perm nodes.
292 arch_env_push_irn_handler(env->arch_env, &be_node_irn_handler);
293 env->phi_handler = be_phi_handler_new(env->arch_env);
294 arch_env_push_irn_handler(env->arch_env, env->phi_handler);
299 static void be_done_env(be_main_env_t *env)
301 env->arch_env->isa->impl->done(env->arch_env->isa);
302 be_phi_handler_free(env->phi_handler);
303 obstack_free(&env->obst, NULL);
307 * A wrapper around a firm dumper. Dumps only, if
310 * @param mask a bitmask containing the reason what will be dumped
311 * @param irg the IR graph to dump
312 * @param suffix the suffix for the dumper
313 * @param dumper the dumper to be called
315 static void dump(int mask, ir_graph *irg, const char *suffix,
316 void (*dumper)(ir_graph *, const char *))
318 if(be_options.dump_flags & mask)
319 be_dump(irg, suffix, dumper);
323 * Prepare a backend graph for code generation and initialize its birg
325 static void initialize_birg(be_irg_t *birg, ir_graph *irg, be_main_env_t *env)
327 memset(birg, 0, sizeof(*birg));
329 birg->main_env = env;
331 edges_deactivate_kind(irg, EDGE_KIND_DEP);
332 edges_activate_kind(irg, EDGE_KIND_DEP);
334 DBG((env->dbg, LEVEL_2, "====> IRG: %F\n", irg));
335 dump(DUMP_INITIAL, irg, "-begin", dump_ir_block_graph);
337 be_stat_init_irg(env->arch_env, irg);
338 be_do_stat_nodes(irg, "01 Begin");
340 /* set the current graph (this is important for several firm functions) */
341 current_ir_graph = irg;
343 /* Normalize proj nodes. */
344 normalize_proj_nodes(irg);
346 /* Make just one return node. */
347 normalize_one_return(irg);
349 /* Remove critical edges */
350 remove_critical_cf_edges(irg);
352 /* Compute the dominance information. */
356 /* Ensure, that the ir_edges are computed. */
359 /* check, if the dominance property is fulfilled. */
360 be_check_dominance(irg);
362 /* reset the phi handler. */
363 be_phi_handler_reset(env->phi_handler);
368 #define BE_TIMER_PUSH(timer) \
369 if (be_options.timing == BE_TIME_ON) { \
370 int res = lc_timer_push(timer); \
371 if (be_options.vrfy_option == BE_VRFY_ASSERT) \
372 assert(res && "Timer already on stack, cannot be pushed twice."); \
373 else if (be_options.vrfy_option == BE_VRFY_WARN && ! res) \
374 fprintf(stderr, "Timer %s already on stack, cannot be pushed twice.\n", \
375 lc_timer_get_name(timer)); \
377 #define BE_TIMER_POP(timer) \
378 if (be_options.timing == BE_TIME_ON) { \
379 lc_timer_t *tmp = lc_timer_pop(); \
380 if (be_options.vrfy_option == BE_VRFY_ASSERT) \
381 assert(tmp == timer && "Attempt to pop wrong timer."); \
382 else if (be_options.vrfy_option == BE_VRFY_WARN && tmp != timer) \
383 fprintf(stderr, "Attempt to pop wrong timer. %s is on stack, trying to pop %s.\n", \
384 lc_timer_get_name(tmp), lc_timer_get_name(timer)); \
388 #define BE_TIMER_ONLY(code) do { if (be_options.timing == BE_TIME_ON) { code; } } while(0)
392 #define BE_TIMER_PUSH(timer)
393 #define BE_TIMER_POP(timer)
394 #define BE_TIMER_ONLY(code)
396 #endif /* WITH_LIBCORE */
400 * The Firm backend main loop.
401 * Do architecture specific lowering for all graphs
402 * and call the architecture specific code generator.
404 * @param file_handle the file handle the output will be written to
406 static void be_main_loop(FILE *file_handle)
411 unsigned num_nodes_b = 0;
412 unsigned num_nodes_a = 0;
413 unsigned num_nodes_r = 0;
414 char prof_filename[256];
416 static const char suffix[] = ".prof";
421 //lc_timer_t *t_prolog = NULL;
422 lc_timer_t *t_abi = NULL;
423 lc_timer_t *t_codegen = NULL;
424 lc_timer_t *t_sched = NULL;
425 lc_timer_t *t_constr = NULL;
426 lc_timer_t *t_regalloc = NULL;
427 lc_timer_t *t_finish = NULL;
428 lc_timer_t *t_emit = NULL;
429 lc_timer_t *t_other = NULL;
430 lc_timer_t *t_verify = NULL;
431 be_ra_timer_t *ra_timer;
433 if (be_options.timing == BE_TIME_ON) {
434 //t_prolog = lc_timer_register("prolog", "prolog");
435 t_abi = lc_timer_register("beabi", "be abi introduction");
436 t_codegen = lc_timer_register("codegen", "codegeneration");
437 t_sched = lc_timer_register("sched", "scheduling");
438 t_constr = lc_timer_register("constr", "assure constraints");
439 t_regalloc = lc_timer_register("regalloc", "register allocation");
440 t_finish = lc_timer_register("finish", "graph finish");
441 t_emit = lc_timer_register("emiter", "code emiter");
442 t_verify = lc_timer_register("verify", "graph verification");
443 t_other = lc_timer_register("other", "other");
445 #endif /* WITH_LIBCORE */
447 be_init_env(&env, file_handle);
449 isa = arch_env_get_isa(env.arch_env);
451 num_birgs = get_irp_n_irgs();
452 // we might need 1 birg more for instrumentation constructor
453 birgs = alloca(sizeof(birgs[0]) * (num_birgs + 1));
455 for(i = 0; i < get_irp_n_irgs(); ++i) {
456 ir_graph *irg = get_irp_irg(i);
458 initialize_birg(&birgs[i], irg, &env);
461 /* please FIXME! I'm a dirty hack. */
462 snprintf(path, sizeof(path), "/proc/self/fd/%d", fileno(file_handle));
463 memset(prof_filename, 0, sizeof(path));
464 readlink(path, prof_filename, sizeof(path) - sizeof(suffix));
465 strcat(prof_filename, suffix);
467 if(be_options.opt_profile) {
468 ir_graph *prof_init_irg = be_profile_instrument(prof_filename);
469 initialize_birg(&birgs[num_birgs], prof_init_irg, &env);
471 pset_insert_ptr(env.arch_env->constructor_entities, get_irg_entity(prof_init_irg));
473 be_profile_read(prof_filename);
477 for (i = 0; i < num_birgs; ++i) {
478 be_irg_t *birg = & birgs[i];
479 ir_graph *irg = birg->irg;
480 optimization_state_t state;
481 const arch_code_generator_if_t *cg_if;
483 birg->execfreqs = compute_execfreq(irg, 10);
485 /* stop and reset timers */
487 //LC_STOP_AND_RESET_TIMER(t_prolog);
488 LC_STOP_AND_RESET_TIMER(t_abi);
489 LC_STOP_AND_RESET_TIMER(t_codegen);
490 LC_STOP_AND_RESET_TIMER(t_sched);
491 LC_STOP_AND_RESET_TIMER(t_constr);
492 LC_STOP_AND_RESET_TIMER(t_regalloc);
493 LC_STOP_AND_RESET_TIMER(t_finish);
494 LC_STOP_AND_RESET_TIMER(t_emit);
495 LC_STOP_AND_RESET_TIMER(t_verify);
496 LC_STOP_AND_RESET_TIMER(t_other);
498 BE_TIMER_PUSH(t_other); /* t_other */
500 BE_TIMER_ONLY(num_nodes_b = get_num_reachable_nodes(irg));
502 /* Get the code generator interface. */
503 cg_if = isa->impl->get_code_generator_if(isa);
505 /* get a code generator for this graph. */
506 birg->cg = cg_if->init(birg);
508 /* some transformations need to be done before abi introduce */
509 arch_code_generator_before_abi(birg->cg);
511 /* set the current graph (this is important for several firm functions) */
512 current_ir_graph = irg;
514 /* reset the phi handler. */
515 be_phi_handler_reset(env.phi_handler);
517 /* implement the ABI conventions. */
518 BE_TIMER_PUSH(t_abi);
519 birg->abi = be_abi_introduce(birg);
522 dump(DUMP_ABI, irg, "-abi", dump_ir_block_graph);
523 be_do_stat_nodes(irg, "02 Abi");
526 BE_TIMER_PUSH(t_codegen);
527 arch_code_generator_prepare_graph(birg->cg);
528 BE_TIMER_POP(t_codegen);
530 be_do_stat_nodes(irg, "03 Prepare");
533 * Since the code generator made a lot of new nodes and skipped
534 * a lot of old ones, we should do dead node elimination here.
535 * Note that this requires disabling the edges here.
537 edges_deactivate(irg);
538 //dead_node_elimination(irg);
541 /* Compute loop nesting information (for weighting copies) */
542 construct_cf_backedges(irg);
543 dump(DUMP_PREPARED, irg, "-prepared", dump_ir_block_graph);
544 BE_TIMER_ONLY(num_nodes_r = get_num_reachable_nodes(irg));
546 /* let backend prepare scheduling */
547 BE_TIMER_PUSH(t_codegen);
548 arch_code_generator_before_sched(birg->cg);
549 BE_TIMER_POP(t_codegen);
551 /* schedule the irg */
552 BE_TIMER_PUSH(t_sched);
553 list_sched(birg, &be_options);
554 BE_TIMER_POP(t_sched);
556 dump(DUMP_SCHED, irg, "-sched", dump_ir_block_graph_sched);
559 BE_TIMER_PUSH(t_verify);
560 be_sched_vrfy(irg, be_options.vrfy_option);
561 BE_TIMER_POP(t_verify);
563 be_do_stat_nodes(irg, "04 Schedule");
565 /* introduce patterns to assure constraints */
566 BE_TIMER_PUSH(t_constr);
567 /* we switch off optimizations here, because they might cause trouble */
568 save_optimization_state(&state);
570 set_opt_normalize(0);
572 /* add Keeps for should_be_different constrained nodes */
573 /* beware: needs schedule due to usage of be_ssa_constr */
574 assure_constraints(birg);
575 BE_TIMER_POP(t_constr);
577 dump(DUMP_SCHED, irg, "-assured", dump_ir_block_graph_sched);
578 be_do_stat_nodes(irg, "05 Constraints");
580 /* connect all stack modifying nodes together (see beabi.c) */
581 BE_TIMER_PUSH(t_abi);
582 be_abi_fix_stack_nodes(birg->abi, NULL);
585 dump(DUMP_SCHED, irg, "-fix_stack", dump_ir_block_graph_sched);
588 BE_TIMER_PUSH(t_verify);
589 be_sched_vrfy(irg, be_options.vrfy_option);
590 BE_TIMER_POP(t_verify);
592 /* do some statistics */
593 be_do_stat_reg_pressure(birg);
595 /* stuff needs to be done after scheduling but before register allocation */
596 BE_TIMER_PUSH(t_codegen);
597 arch_code_generator_before_ra(birg->cg);
598 BE_TIMER_POP(t_codegen);
600 /* Do register allocation */
601 BE_TIMER_PUSH(t_regalloc);
602 ra_timer = ra->allocate(birg);
603 BE_TIMER_POP(t_regalloc);
605 dump(DUMP_RA, irg, "-ra", dump_ir_block_graph_sched);
606 be_do_stat_nodes(irg, "06 Register Allocation");
608 /* let the codegenerator prepare the graph for emitter */
609 BE_TIMER_PUSH(t_finish);
610 arch_code_generator_after_ra(birg->cg);
611 BE_TIMER_POP(t_finish);
613 /* fix stack offsets */
614 BE_TIMER_PUSH(t_abi);
615 be_abi_fix_stack_nodes(birg->abi, NULL);
616 be_remove_dead_nodes_from_schedule(irg);
617 be_abi_fix_stack_bias(birg->abi);
620 BE_TIMER_PUSH(t_finish);
621 arch_code_generator_finish(birg->cg);
622 BE_TIMER_POP(t_finish);
624 dump(DUMP_FINAL, irg, "-finish", dump_ir_block_graph_sched);
626 /* check schedule and register allocation */
627 BE_TIMER_PUSH(t_verify);
628 if (be_options.vrfy_option == BE_VRFY_WARN) {
629 //irg_verify(irg, VRFY_ENFORCE_SSA);
630 be_check_dominance(irg);
631 be_verify_out_edges(irg);
632 be_verify_schedule(irg);
633 be_verify_register_allocation(env.arch_env, irg);
635 else if (be_options.vrfy_option == BE_VRFY_ASSERT) {
636 //assert(irg_verify(irg, VRFY_ENFORCE_SSA) && "irg verification failed");
637 assert(be_verify_out_edges(irg));
638 assert(be_check_dominance(irg) && "Dominance verification failed");
639 assert(be_verify_schedule(irg) && "Schedule verification failed");
640 assert(be_verify_register_allocation(env.arch_env, irg)
641 && "register allocation verification failed");
643 BE_TIMER_POP(t_verify);
645 /* emit assembler code */
646 BE_TIMER_PUSH(t_emit);
647 arch_code_generator_done(birg->cg);
648 BE_TIMER_POP(t_emit);
650 dump(DUMP_FINAL, irg, "-end", dump_ir_extblock_graph_sched);
652 BE_TIMER_PUSH(t_abi);
653 be_abi_free(birg->abi);
656 be_do_stat_nodes(irg, "07 Final");
657 restore_optimization_state(&state);
659 BE_TIMER_ONLY(num_nodes_a = get_num_reachable_nodes(irg));
660 BE_TIMER_POP(t_other);
662 #define LC_EMIT(timer) printf("%-20s: %.3lf msec\n", lc_timer_get_description(timer), (double)lc_timer_elapsed_usec(timer) / 1000.0)
663 #define LC_EMIT_RA(timer) printf("\t%-20s: %.3lf msec\n", lc_timer_get_description(timer), (double)lc_timer_elapsed_usec(timer) / 1000.0)
665 printf("==>> IRG %s <<==\n", get_entity_name(get_irg_entity(irg)));
666 printf("# nodes at begin: %u\n", num_nodes_b);
667 printf("# nodes before ra: %u\n", num_nodes_r);
668 printf("# nodes at end: %u\n\n", num_nodes_a);
675 LC_EMIT_RA(ra_timer->t_prolog);
676 LC_EMIT_RA(ra_timer->t_live);
677 LC_EMIT_RA(ra_timer->t_spill);
678 LC_EMIT_RA(ra_timer->t_spillslots);
679 LC_EMIT_RA(ra_timer->t_color);
680 LC_EMIT_RA(ra_timer->t_ifg);
681 LC_EMIT_RA(ra_timer->t_copymin);
682 LC_EMIT_RA(ra_timer->t_ssa);
683 LC_EMIT_RA(ra_timer->t_epilog);
684 LC_EMIT_RA(ra_timer->t_verify);
685 LC_EMIT_RA(ra_timer->t_other);
694 free_execfreq(birg->execfreqs);
696 /* switched off due to statistics (statistic module needs all irgs) */
697 if (! stat_is_active())
708 /* Main interface to the frontend. */
709 void be_main(FILE *file_handle)
712 lc_timer_t *t = NULL;
713 #endif /* WITH_LIBCORE */
716 /* The user specified another config file to read. do that now. */
717 if(strlen(config_file) > 0) {
720 if((f = fopen(config_file, "rt")) != NULL) {
721 lc_opt_from_file(config_file, f, NULL);
726 if (be_options.timing == BE_TIME_ON) {
727 t = lc_timer_register("bemain", "measure complete bemain loop");
729 if (lc_timer_enter_high_priority()) {
730 fprintf(stderr, "Warning: Could not enter high priority mode.\n");
733 lc_timer_reset_and_start(t);
735 #endif /* WITH_LIBCORE */
737 /* never build code for pseudo irgs */
738 set_visit_pseudo_irgs(0);
741 be_main_loop(file_handle);
744 if (be_options.timing == BE_TIME_ON) {
746 lc_timer_leave_high_priority();
747 printf("%-20s: %lu msec\n", "BEMAINLOOP", lc_timer_elapsed_msec(t));
749 #endif /* WITH_LIBCORE */
752 /** The debug info retriever function. */
753 static retrieve_dbg_func retrieve_dbg = NULL;
755 /* Sets a debug info retriever. */
756 void be_set_debug_retrieve(retrieve_dbg_func func) {
760 /* Retrieve the debug info. */
761 const char *be_retrieve_dbg_info(const dbg_info *dbg, unsigned *line) {
763 return retrieve_dbg(dbg, line);
768 int be_put_ignore_regs(const be_irg_t *birg, const arch_register_class_t *cls, bitset_t *bs)
771 bs = bitset_alloca(cls->n_regs);
773 bitset_clear_all(bs);
775 assert(bitset_size(bs) == (unsigned) cls->n_regs);
776 arch_put_non_ignore_regs(birg->main_env->arch_env, cls, bs);
778 be_abi_put_ignore_regs(birg->abi, cls, bs);
779 return bitset_popcnt(bs);