X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=ir%2Fir%2Firgopt.c;h=87b0cb20c5025a55c5f86c2b7b7a8785124ec06d;hb=4ef694e7427191d868477ccb429899fe1ae9b2fc;hp=ff19b5e24391320263eca2923e8d6cc1b7bda818;hpb=86f5ed335727adaa9e6550254fb6d2726982bf33;p=libfirm diff --git a/ir/ir/irgopt.c b/ir/ir/irgopt.c index ff19b5e24..87b0cb20c 100644 --- a/ir/ir/irgopt.c +++ b/ir/ir/irgopt.c @@ -22,56 +22,38 @@ * @brief Optimizations for a whole ir graph, i.e., a procedure. * @author Christian Schaefer, Goetz Lindenmaier, Sebastian Felis, * Michael Beck - * @version $Id$ */ -#ifdef HAVE_CONFIG_H -# include "config.h" -#endif +#include "config.h" #include #include "irnode_t.h" #include "irgraph_t.h" -#include "irprog_t.h" #include "iroptimize.h" -#include "ircons_t.h" #include "iropt_t.h" #include "irgopt.h" #include "irgmod.h" #include "irgwalk.h" +#include "ircons.h" -#include "adt/array.h" -#include "adt/pset.h" -#include "adt/pmap.h" #include "adt/pdeq.h" -#include "adt/xmalloc.h" - -#include "irouts.h" -#include "irloop_t.h" -#include "irbackedge_t.h" -#include "cgana.h" -#include "trouts.h" -#include "error.h" +#include "irpass_t.h" #include "irflag_t.h" -#include "irhooks.h" #include "iredges_t.h" #include "irtools.h" -/*------------------------------------------------------------------*/ -/* apply optimizations of iropt to all nodes. */ -/*------------------------------------------------------------------*/ - /** * A wrapper around optimize_inplace_2() to be called from a walker. */ -static void optimize_in_place_wrapper (ir_node *n, void *env) { +static void optimize_in_place_wrapper(ir_node *n, void *env) +{ ir_node *optimized = optimize_in_place_2(n); (void) env; if (optimized != n) { - exchange (n, optimized); + exchange(n, optimized); } } @@ -83,26 +65,23 @@ static void optimize_in_place_wrapper (ir_node *n, void *env) { * * @note current_ir_graph must be set */ -static INLINE void do_local_optimize(ir_node *n) { - /* Handle graph state */ - assert(get_irg_phase_state(current_ir_graph) != phase_building); +static inline void do_local_optimize(ir_node *n) +{ + ir_graph *irg = get_irn_irg(n); if (get_opt_global_cse()) - set_irg_pinned(current_ir_graph, op_pin_state_floats); - set_irg_outs_inconsistent(current_ir_graph); - set_irg_doms_inconsistent(current_ir_graph); - set_irg_loopinfo_inconsistent(current_ir_graph); + set_irg_pinned(irg, op_pin_state_floats); + clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE); /* Clean the value_table in irg for the CSE. */ - del_identities(current_ir_graph->value_table); - current_ir_graph->value_table = new_identities(); + new_identities(irg); /* walk over the graph */ irg_walk(n, firm_clear_link, optimize_in_place_wrapper, NULL); } -/* Applies local optimizations (see iropt.h) to all nodes reachable from node n */ -void local_optimize_node(ir_node *n) { +void local_optimize_node(ir_node *n) +{ ir_graph *rem = current_ir_graph; current_ir_graph = get_irn_irg(n); @@ -111,63 +90,84 @@ void local_optimize_node(ir_node *n) { current_ir_graph = rem; } +static void enqueue_node(ir_node *node, pdeq *waitq) +{ + if (get_irn_link(node) == waitq) + return; + pdeq_putr(waitq, node); + set_irn_link(node, waitq); +} + +/** + * Enqueue all users of a node to a wait queue. + * Handles mode_T nodes. + */ +static void enqueue_users(ir_node *n, pdeq *waitq) +{ + foreach_out_edge(n, edge) { + ir_node *succ = get_edge_src_irn(edge); + + enqueue_node(succ, waitq); + + /* Also enqueue Phis to prevent inconsistencies. */ + if (is_Block(succ)) { + foreach_out_edge(succ, edge2) { + ir_node *succ2 = get_edge_src_irn(edge2); + + if (is_Phi(succ2)) { + enqueue_node(succ2, waitq); + } + } + } else if (get_irn_mode(succ) == mode_T) { + /* A mode_T node has Proj's. Because most optimizations + run on the Proj's we have to enqueue them also. */ + enqueue_users(succ, waitq); + } + } +} + /** * Block-Walker: uses dominance depth to mark dead blocks. */ -static void kill_dead_blocks(ir_node *block, void *env) { - (void) env; +static void find_unreachable_blocks(ir_node *block, void *env) +{ + pdeq *waitq = (pdeq*) env; if (get_Block_dom_depth(block) < 0) { - /* - * Note that the new dominance code correctly handles - * the End block, i.e. it is always reachable from Start - */ - set_Block_dead(block); + ir_graph *irg = get_irn_irg(block); + ir_node *end = get_irg_end(irg); + + foreach_block_succ(block, edge) { + ir_node *succ_block = get_edge_src_irn(edge); + enqueue_node(succ_block, waitq); + foreach_out_edge(succ_block, edge2) { + ir_node *succ = get_edge_src_irn(edge2); + if (is_Phi(succ)) + enqueue_node(succ, waitq); + } + } + enqueue_node(end, waitq); } } -/* Applies local optimizations (see iropt.h) to all nodes reachable from node n. */ -void local_optimize_graph(ir_graph *irg) { +void local_optimize_graph(ir_graph *irg) +{ ir_graph *rem = current_ir_graph; current_ir_graph = irg; - if (get_irg_dom_state(irg) == dom_consistent) - irg_block_walk_graph(irg, NULL, kill_dead_blocks, NULL); - do_local_optimize(get_irg_end(irg)); current_ir_graph = rem; } -/** - * Enqueue all users of a node to a wait queue. - * Handles mode_T nodes. - */ -static void enqueue_users(ir_node *n, pdeq *waitq) { - const ir_edge_t *edge; - - foreach_out_edge(n, edge) { - ir_node *succ = get_edge_src_irn(edge); - - if (get_irn_link(succ) != waitq) { - pdeq_putr(waitq, succ); - set_irn_link(succ, waitq); - } - if (get_irn_mode(succ) == mode_T) { - /* A mode_T node has Proj's. Because most optimizations - run on the Proj's we have to enqueue them also. */ - enqueue_users(succ, waitq); - } - } -} - /** * Data flow optimization walker. - * Optimizes all nodes and enqueue it's users + * Optimizes all nodes and enqueue its users * if done. */ -static void opt_walker(ir_node *n, void *env) { - pdeq *waitq = env; +static void opt_walker(ir_node *n, void *env) +{ + pdeq *waitq = (pdeq*)env; ir_node *optimized; optimized = optimize_in_place_2(n); @@ -179,1637 +179,77 @@ static void opt_walker(ir_node *n, void *env) { } } -/* Applies local optimizations to all nodes in the graph until fixpoint. */ -void optimize_graph_df(ir_graph *irg) { +int optimize_graph_df(ir_graph *irg) +{ pdeq *waitq = new_pdeq(); ir_graph *rem = current_ir_graph; ir_node *end; - int i, state, n_ka; current_ir_graph = irg; - state = edges_assure(irg); - if (get_opt_global_cse()) - set_irg_pinned(current_ir_graph, op_pin_state_floats); - - /* Clean the value_table in irg for the CSE. */ - del_identities(irg->value_table); - irg->value_table = new_identities(); - - if (get_irg_dom_state(irg) == dom_consistent) - irg_block_walk_graph(irg, NULL, kill_dead_blocks, NULL); + set_irg_pinned(irg, op_pin_state_floats); - /* invalidate info */ - set_irg_outs_inconsistent(irg); - set_irg_doms_inconsistent(irg); - set_irg_loopinfo_inconsistent(irg); + /* enable unreachable code elimination */ + assert(!irg_is_constrained(irg, IR_GRAPH_CONSTRAINT_OPTIMIZE_UNREACHABLE_CODE)); + add_irg_constraints(irg, IR_GRAPH_CONSTRAINT_OPTIMIZE_UNREACHABLE_CODE); - set_using_irn_link(irg); + new_identities(irg); + assure_edges(irg); + assure_doms(irg); - end = get_irg_end(irg); - n_ka = get_End_n_keepalives(end); - /* walk over the graph, but don't touch keep-alives */ - irg_walk(get_irg_end_block(irg), NULL, opt_walker, waitq); + ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK); + irg_walk_graph(irg, NULL, opt_walker, waitq); - /* - * Optimize keep-alives by removing superfluous ones. - * Beware: the last transformation might add new keep-alives - * that keep blocks that are where visited! So, check only the - * "old" keep-alives, not the new ones! - * - * FIXME: it might be better to completely remove this - * optimization here ... - */ - for (i = n_ka - 1; i >= 0; --i) { - ir_node *ka = get_End_keepalive(end, i); - - if (irn_visited(ka) && !is_irn_keep(ka)) { - /* this node can be regularly visited, no need to keep it */ - set_End_keepalive(end, i, get_irg_bad(irg)); - } - } - /* now walk again and visit all not yet visited nodes */ - set_irg_visited(current_ir_graph, get_irg_visited(irg) - 1); - irg_walk(get_irg_end(irg), NULL, opt_walker, waitq); - - /* finish the wait queue */ - while (! pdeq_empty(waitq)) { - ir_node *n = pdeq_getl(waitq); - if (! is_Bad(n)) + /* any optimized nodes are stored in the wait queue, + * so if it's not empty, the graph has been changed */ + while (!pdeq_empty(waitq)) { + /* finish the wait queue */ + while (! pdeq_empty(waitq)) { + ir_node *n = (ir_node*)pdeq_getl(waitq); opt_walker(n, waitq); - } - - del_pdeq(waitq); - - clear_using_irn_link(irg); - - if (! state) - edges_deactivate(irg); - - current_ir_graph = rem; -} - - -/*------------------------------------------------------------------*/ -/* Routines for dead node elimination / copying garbage collection */ -/* of the obstack. */ -/*------------------------------------------------------------------*/ - -/** - * Remember the new node in the old node by using a field all nodes have. - */ -#define set_new_node(oldn, newn) set_irn_link(oldn, newn) - -/** - * Get this new node, before the old node is forgotten. - */ -#define get_new_node(oldn) get_irn_link(oldn) - -/** - * Check if a new node was set. - */ -#define has_new_node(n) (get_new_node(n) != NULL) - -/** - * We use the block_visited flag to mark that we have computed the - * number of useful predecessors for this block. - * Further we encode the new arity in this flag in the old blocks. - * Remembering the arity is useful, as it saves a lot of pointer - * accesses. This function is called for all Phi and Block nodes - * in a Block. - */ -static INLINE int -compute_new_arity(ir_node *b) { - int i, res, irn_arity; - int irg_v, block_v; - - irg_v = get_irg_block_visited(current_ir_graph); - block_v = get_Block_block_visited(b); - if (block_v >= irg_v) { - /* we computed the number of preds for this block and saved it in the - block_v flag */ - return block_v - irg_v; - } else { - /* compute the number of good predecessors */ - res = irn_arity = get_irn_arity(b); - for (i = 0; i < irn_arity; i++) - if (is_Bad(get_irn_n(b, i))) res--; - /* save it in the flag. */ - set_Block_block_visited(b, irg_v + res); - return res; - } -} - -/** - * Copies the node to the new obstack. The Ins of the new node point to - * the predecessors on the old obstack. For block/phi nodes not all - * predecessors might be copied. n->link points to the new node. - * For Phi and Block nodes the function allocates in-arrays with an arity - * only for useful predecessors. The arity is determined by counting - * the non-bad predecessors of the block. - * - * @param n The node to be copied - * @param env if non-NULL, the node number attribute will be copied to the new node - * - * Note: Also used for loop unrolling. - */ -static void copy_node(ir_node *n, void *env) { - ir_node *nn, *block; - int new_arity; - ir_op *op = get_irn_op(n); - (void) env; - - if (op == op_Bad) { - /* node copied already */ - return; - } else if (op == op_Block) { - block = NULL; - new_arity = compute_new_arity(n); - n->attr.block.graph_arr = NULL; - } else { - block = get_nodes_block(n); - if (op == op_Phi) { - new_arity = compute_new_arity(block); - } else { - new_arity = get_irn_arity(n); - } - } - nn = new_ir_node(get_irn_dbg_info(n), - current_ir_graph, - block, - op, - get_irn_mode(n), - new_arity, - get_irn_in(n) + 1); - /* Copy the attributes. These might point to additional data. If this - was allocated on the old obstack the pointers now are dangling. This - frees e.g. the memory of the graph_arr allocated in new_immBlock. */ - if (op == op_Block) { - /* we cannot allow blocks WITHOUT macroblock input */ - set_Block_MacroBlock(nn, get_Block_MacroBlock(n)); - } - copy_node_attr(n, nn); - -#ifdef DEBUG_libfirm - { - int copy_node_nr = env != NULL; - if (copy_node_nr) { - /* for easier debugging, we want to copy the node numbers too */ - nn->node_nr = n->node_nr; - } - } -#endif - - set_new_node(n, nn); - hook_dead_node_elim_subst(current_ir_graph, n, nn); -} - -/** - * Copies new predecessors of old node to new node remembered in link. - * Spare the Bad predecessors of Phi and Block nodes. - */ -static void copy_preds(ir_node *n, void *env) { - ir_node *nn, *block; - int i, j, irn_arity; - (void) env; - - nn = get_new_node(n); - - if (is_Block(n)) { - /* copy the macro block header */ - ir_node *mbh = get_Block_MacroBlock(n); - - if (mbh == n) { - /* this block is a macroblock header */ - set_Block_MacroBlock(nn, nn); - } else { - /* get the macro block header */ - ir_node *nmbh = get_new_node(mbh); - assert(nmbh != NULL); - set_Block_MacroBlock(nn, nmbh); - } - - /* Don't copy Bad nodes. */ - j = 0; - irn_arity = get_irn_arity(n); - for (i = 0; i < irn_arity; i++) { - if (! is_Bad(get_irn_n(n, i))) { - ir_node *pred = get_irn_n(n, i); - set_irn_n(nn, j, get_new_node(pred)); - j++; - } - } - /* repair the block visited flag from above misuse. Repair it in both - graphs so that the old one can still be used. */ - set_Block_block_visited(nn, 0); - set_Block_block_visited(n, 0); - /* Local optimization could not merge two subsequent blocks if - in array contained Bads. Now it's possible. - We don't call optimize_in_place as it requires - that the fields in ir_graph are set properly. */ - if ((get_opt_control_flow_straightening()) && - (get_Block_n_cfgpreds(nn) == 1) && - is_Jmp(get_Block_cfgpred(nn, 0))) { - ir_node *old = get_nodes_block(get_Block_cfgpred(nn, 0)); - if (nn == old) { - /* Jmp jumps into the block it is in -- deal self cycle. */ - assert(is_Bad(get_new_node(get_irg_bad(current_ir_graph)))); - exchange(nn, get_new_node(get_irg_bad(current_ir_graph))); - } else { - exchange(nn, old); - } - } - } else if (is_Phi(n) && get_irn_arity(n) > 0) { - /* Don't copy node if corresponding predecessor in block is Bad. - The Block itself should not be Bad. */ - block = get_nodes_block(n); - set_nodes_block(nn, get_new_node(block)); - j = 0; - irn_arity = get_irn_arity(n); - for (i = 0; i < irn_arity; i++) { - if (! is_Bad(get_irn_n(block, i))) { - ir_node *pred = get_irn_n(n, i); - set_irn_n(nn, j, get_new_node(pred)); - /*if (is_backedge(n, i)) set_backedge(nn, j);*/ - j++; - } - } - /* If the pre walker reached this Phi after the post walker visited the - block block_visited is > 0. */ - set_Block_block_visited(get_nodes_block(n), 0); - /* Compacting the Phi's ins might generate Phis with only one - predecessor. */ - if (get_irn_arity(nn) == 1) - exchange(nn, get_irn_n(nn, 0)); - } else { - irn_arity = get_irn_arity(n); - for (i = -1; i < irn_arity; i++) - set_irn_n(nn, i, get_new_node(get_irn_n(n, i))); - } - /* Now the new node is complete. We can add it to the hash table for CSE. - @@@ inlining aborts if we identify End. Why? */ - if (!is_End(nn)) - add_identities(current_ir_graph->value_table, nn); -} - -/** - * Copies the graph recursively, compacts the keep-alives of the end node. - * - * @param irg the graph to be copied - * @param copy_node_nr If non-zero, the node number will be copied - */ -static void copy_graph(ir_graph *irg, int copy_node_nr) { - ir_node *oe, *ne, *ob, *nb, *om, *nm; /* old end, new end, old bad, new bad, old NoMem, new NoMem */ - ir_node *ka; /* keep alive */ - int i, irn_arity; - unsigned long vfl; - - /* Some nodes must be copied by hand, sigh */ - vfl = get_irg_visited(irg); - set_irg_visited(irg, vfl + 1); - - oe = get_irg_end(irg); - mark_irn_visited(oe); - /* copy the end node by hand, allocate dynamic in array! */ - ne = new_ir_node(get_irn_dbg_info(oe), - irg, - NULL, - op_End, - mode_X, - -1, - NULL); - /* Copy the attributes. Well, there might be some in the future... */ - copy_node_attr(oe, ne); - set_new_node(oe, ne); - - /* copy the Bad node */ - ob = get_irg_bad(irg); - mark_irn_visited(ob); - nb = new_ir_node(get_irn_dbg_info(ob), - irg, - NULL, - op_Bad, - mode_T, - 0, - NULL); - copy_node_attr(ob, nb); - set_new_node(ob, nb); - - /* copy the NoMem node */ - om = get_irg_no_mem(irg); - mark_irn_visited(om); - nm = new_ir_node(get_irn_dbg_info(om), - irg, - NULL, - op_NoMem, - mode_M, - 0, - NULL); - copy_node_attr(om, nm); - set_new_node(om, nm); - - /* copy the live nodes */ - set_irg_visited(irg, vfl); - irg_walk(get_nodes_block(oe), copy_node, copy_preds, INT_TO_PTR(copy_node_nr)); - - /* Note: from yet, the visited flag of the graph is equal to vfl + 1 */ - - /* visit the anchors as well */ - for (i = get_irg_n_anchors(irg) - 1; i >= 0; --i) { - ir_node *n = get_irg_anchor(irg, i); - - if (n && (get_irn_visited(n) <= vfl)) { - set_irg_visited(irg, vfl); - irg_walk(n, copy_node, copy_preds, INT_TO_PTR(copy_node_nr)); - } - } - - /* copy_preds for the end node ... */ - set_nodes_block(ne, get_new_node(get_nodes_block(oe))); - - /*- ... and now the keep alives. -*/ - /* First pick the not marked block nodes and walk them. We must pick these - first as else we will oversee blocks reachable from Phis. */ - irn_arity = get_End_n_keepalives(oe); - for (i = 0; i < irn_arity; i++) { - ka = get_End_keepalive(oe, i); - if (is_Block(ka)) { - if (get_irn_visited(ka) <= vfl) { - /* We must keep the block alive and copy everything reachable */ - set_irg_visited(irg, vfl); - irg_walk(ka, copy_node, copy_preds, INT_TO_PTR(copy_node_nr)); - } - add_End_keepalive(ne, get_new_node(ka)); - } - } - - /* Now pick other nodes. Here we will keep all! */ - irn_arity = get_End_n_keepalives(oe); - for (i = 0; i < irn_arity; i++) { - ka = get_End_keepalive(oe, i); - if (!is_Block(ka)) { - if (get_irn_visited(ka) <= vfl) { - /* We didn't copy the node yet. */ - set_irg_visited(irg, vfl); - irg_walk(ka, copy_node, copy_preds, INT_TO_PTR(copy_node_nr)); - } - add_End_keepalive(ne, get_new_node(ka)); - } - } - - /* start block sometimes only reached after keep alives */ - set_nodes_block(nb, get_new_node(get_nodes_block(ob))); - set_nodes_block(nm, get_new_node(get_nodes_block(om))); -} - -/** - * Copies the graph reachable from current_ir_graph->end to the obstack - * in current_ir_graph and fixes the environment. - * Then fixes the fields in current_ir_graph containing nodes of the - * graph. - * - * @param copy_node_nr If non-zero, the node number will be copied - */ -static void -copy_graph_env(int copy_node_nr) { - ir_graph *irg = current_ir_graph; - ir_node *old_end, *new_anchor; - int i; - - /* remove end_except and end_reg nodes */ - old_end = get_irg_end(irg); - set_irg_end_except (irg, old_end); - set_irg_end_reg (irg, old_end); - - /* Not all nodes remembered in irg might be reachable - from the end node. Assure their link is set to NULL, so that - we can test whether new nodes have been computed. */ - for (i = get_irg_n_anchors(irg) - 1; i >= 0; --i) { - ir_node *n = get_irg_anchor(irg, i); - if (n != NULL) - set_new_node(n, NULL); - } - /* we use the block walk flag for removing Bads from Blocks ins. */ - inc_irg_block_visited(irg); - - /* copy the graph */ - copy_graph(irg, copy_node_nr); - - /* fix the anchor */ - old_end = get_irg_end(irg); - new_anchor = new_Anchor(irg); - - for (i = get_irg_n_anchors(irg) - 1; i >= 0; --i) { - ir_node *n = get_irg_anchor(irg, i); - if (n) - set_irn_n(new_anchor, i, get_new_node(n)); - } - free_End(old_end); - irg->anchor = new_anchor; - - /* ensure the new anchor is placed in the endblock */ - set_nodes_block(new_anchor, get_irg_end_block(irg)); -} - -/** - * Copies all reachable nodes to a new obstack. Removes bad inputs - * from block nodes and the corresponding inputs from Phi nodes. - * Merges single exit blocks with single entry blocks and removes - * 1-input Phis. - * Adds all new nodes to a new hash table for CSE. Does not - * perform CSE, so the hash table might contain common subexpressions. - */ -void dead_node_elimination(ir_graph *irg) { - ir_graph *rem; -#ifdef INTERPROCEDURAL_VIEW - int rem_ipview = get_interprocedural_view(); -#endif - struct obstack *graveyard_obst = NULL; - struct obstack *rebirth_obst = NULL; - assert(! edges_activated(irg) && "dead node elimination requires disabled edges"); - - /* inform statistics that we started a dead-node elimination run */ - hook_dead_node_elim(irg, 1); - - /* Remember external state of current_ir_graph. */ - rem = current_ir_graph; - current_ir_graph = irg; -#ifdef INTERPROCEDURAL_VIEW - set_interprocedural_view(0); -#endif - - assert(get_irg_phase_state(irg) != phase_building); - - /* Handle graph state */ - free_callee_info(irg); - free_irg_outs(irg); - free_trouts(); - - /* @@@ so far we loose loops when copying */ - free_loop_information(irg); - - set_irg_doms_inconsistent(irg); - - /* A quiet place, where the old obstack can rest in peace, - until it will be cremated. */ - graveyard_obst = irg->obst; - - /* A new obstack, where the reachable nodes will be copied to. */ - rebirth_obst = xmalloc(sizeof(*rebirth_obst)); - irg->obst = rebirth_obst; - obstack_init(irg->obst); - irg->last_node_idx = 0; - - /* We also need a new value table for CSE */ - del_identities(irg->value_table); - irg->value_table = new_identities(); - - /* Copy the graph from the old to the new obstack */ - copy_graph_env(/*copy_node_nr=*/1); - - /* Free memory from old unoptimized obstack */ - obstack_free(graveyard_obst, 0); /* First empty the obstack ... */ - xfree(graveyard_obst); /* ... then free it. */ - - /* inform statistics that the run is over */ - hook_dead_node_elim(irg, 0); - - current_ir_graph = rem; -#ifdef INTERPROCEDURAL_VIEW - set_interprocedural_view(rem_ipview); -#endif -} - -/** - * Relink bad predecessors of a block and store the old in array to the - * link field. This function is called by relink_bad_predecessors(). - * The array of link field starts with the block operand at position 0. - * If block has bad predecessors, create a new in array without bad preds. - * Otherwise let in array untouched. - */ -static void relink_bad_block_predecessors(ir_node *n, void *env) { - ir_node **new_in, *irn; - int i, new_irn_n, old_irn_arity, new_irn_arity = 0; - (void) env; - - /* if link field of block is NULL, look for bad predecessors otherwise - this is already done */ - if (is_Block(n) && get_irn_link(n) == NULL) { - /* save old predecessors in link field (position 0 is the block operand)*/ - set_irn_link(n, get_irn_in(n)); - - /* count predecessors without bad nodes */ - old_irn_arity = get_irn_arity(n); - for (i = 0; i < old_irn_arity; i++) - if (!is_Bad(get_irn_n(n, i))) - ++new_irn_arity; - - /* arity changing: set new predecessors without bad nodes */ - if (new_irn_arity < old_irn_arity) { - /* Get new predecessor array. We do not resize the array, as we must - keep the old one to update Phis. */ - new_in = NEW_ARR_D(ir_node *, current_ir_graph->obst, (new_irn_arity+1)); - - /* set new predecessors in array */ - new_in[0] = NULL; - new_irn_n = 1; - for (i = 0; i < old_irn_arity; i++) { - irn = get_irn_n(n, i); - if (!is_Bad(irn)) { - new_in[new_irn_n] = irn; - is_backedge(n, i) ? set_backedge(n, new_irn_n-1) : set_not_backedge(n, new_irn_n-1); - ++new_irn_n; - } - } - /* ARR_SETLEN(int, n->attr.block.backedge, new_irn_arity); */ - ARR_SHRINKLEN(n->attr.block.backedge, new_irn_arity); - n->in = new_in; - } /* ir node has bad predecessors */ - } /* Block is not relinked */ -} - -/** - * Relinks Bad predecessors from Blocks and Phis called by walker - * remove_bad_predecesors(). If n is a Block, call - * relink_bad_block_redecessors(). If n is a Phi-node, call also the relinking - * function of Phi's Block. If this block has bad predecessors, relink preds - * of the Phi-node. - */ -static void relink_bad_predecessors(ir_node *n, void *env) { - ir_node *block, **old_in; - int i, old_irn_arity, new_irn_arity; - - /* relink bad predecessors of a block */ - if (is_Block(n)) - relink_bad_block_predecessors(n, env); - - /* If Phi node relink its block and its predecessors */ - if (is_Phi(n)) { - /* Relink predecessors of phi's block */ - block = get_nodes_block(n); - if (get_irn_link(block) == NULL) - relink_bad_block_predecessors(block, env); - - old_in = (ir_node **)get_irn_link(block); /* Of Phi's Block */ - old_irn_arity = ARR_LEN(old_in); - - /* Relink Phi predecessors if count of predecessors changed */ - if (old_irn_arity != ARR_LEN(get_irn_in(block))) { - /* set new predecessors in array - n->in[0] remains the same block */ - new_irn_arity = 1; - for(i = 1; i < old_irn_arity; i++) - if (!is_Bad(old_in[i])) { - n->in[new_irn_arity] = n->in[i]; - is_backedge(n, i) ? set_backedge(n, new_irn_arity) : set_not_backedge(n, new_irn_arity); - ++new_irn_arity; - } - - ARR_SETLEN(ir_node *, n->in, new_irn_arity); - ARR_SETLEN(int, n->attr.phi.u.backedge, new_irn_arity); } - } /* n is a Phi node */ -} - -/* - * Removes Bad Bad predecessors from Blocks and the corresponding - * inputs to Phi nodes as in dead_node_elimination but without - * copying the graph. - * On walking up set the link field to NULL, on walking down call - * relink_bad_predecessors() (This function stores the old in array - * to the link field and sets a new in array if arity of predecessors - * changes). - */ -void remove_bad_predecessors(ir_graph *irg) { - panic("Fix backedge handling first"); - irg_walk_graph(irg, firm_clear_link, relink_bad_predecessors, NULL); -} - - -/* - __ _ __ __ - (_ __ o _ | \/ |_ - __)|_| | \_/ | \_/(/_ |_/\__|__ - - The following stuff implements a facility that automatically patches - registered ir_node pointers to the new node when a dead node elimination occurs. -*/ - -struct _survive_dce_t { - struct obstack obst; - pmap *places; - pmap *new_places; - hook_entry_t dead_node_elim; - hook_entry_t dead_node_elim_subst; -}; - -typedef struct _survive_dce_list_t { - struct _survive_dce_list_t *next; - ir_node **place; -} survive_dce_list_t; - -static void dead_node_hook(void *context, ir_graph *irg, int start) { - survive_dce_t *sd = context; - (void) irg; - - /* Create a new map before the dead node elimination is performed. */ - if (start) { - sd->new_places = pmap_create_ex(pmap_count(sd->places)); - } else { - /* Patch back all nodes if dead node elimination is over and something is to be done. */ - pmap_destroy(sd->places); - sd->places = sd->new_places; - sd->new_places = NULL; - } -} - -/** - * Hook called when dead node elimination replaces old by nw. - */ -static void dead_node_subst_hook(void *context, ir_graph *irg, ir_node *old, ir_node *nw) { - survive_dce_t *sd = context; - survive_dce_list_t *list = pmap_get(sd->places, old); - (void) irg; - - /* If the node is to be patched back, write the new address to all registered locations. */ - if (list) { - survive_dce_list_t *p; - - for (p = list; p; p = p->next) - *(p->place) = nw; - - pmap_insert(sd->new_places, nw, list); + /* Calculate dominance so we can kill unreachable code + * We want this intertwined with localopts for better optimization (phase coupling) */ + compute_doms(irg); + irg_block_walk_graph(irg, NULL, find_unreachable_blocks, waitq); } -} - -/** - * Make a new Survive DCE environment. - */ -survive_dce_t *new_survive_dce(void) { - survive_dce_t *res = xmalloc(sizeof(res[0])); - obstack_init(&res->obst); - res->places = pmap_create(); - res->new_places = NULL; - - res->dead_node_elim.hook._hook_dead_node_elim = dead_node_hook; - res->dead_node_elim.context = res; - res->dead_node_elim.next = NULL; - - res->dead_node_elim_subst.hook._hook_dead_node_elim_subst = dead_node_subst_hook; - res->dead_node_elim_subst.context = res; - res->dead_node_elim_subst.next = NULL; - -#ifndef FIRM_ENABLE_HOOKS - assert(0 && "need hooks enabled"); -#endif - - register_hook(hook_dead_node_elim, &res->dead_node_elim); - register_hook(hook_dead_node_elim_subst, &res->dead_node_elim_subst); - return res; -} - -/** - * Free a Survive DCE environment. - */ -void free_survive_dce(survive_dce_t *sd) { - obstack_free(&sd->obst, NULL); - pmap_destroy(sd->places); - unregister_hook(hook_dead_node_elim, &sd->dead_node_elim); - unregister_hook(hook_dead_node_elim_subst, &sd->dead_node_elim_subst); - xfree(sd); -} - -/** - * Register a node pointer to be patched upon DCE. - * When DCE occurs, the node pointer specified by @p place will be - * patched to the new address of the node it is pointing to. - * - * @param sd The Survive DCE environment. - * @param place The address of the node pointer. - */ -void survive_dce_register_irn(survive_dce_t *sd, ir_node **place) { - if (*place != NULL) { - ir_node *irn = *place; - survive_dce_list_t *curr = pmap_get(sd->places, irn); - survive_dce_list_t *nw = obstack_alloc(&sd->obst, sizeof(nw[0])); - - nw->next = curr; - nw->place = place; - - pmap_insert(sd->places, irn, nw); - } -} - -/*--------------------------------------------------------------------*/ -/* Functionality for inlining */ -/*--------------------------------------------------------------------*/ - -/** - * Copy node for inlineing. Updates attributes that change when - * inlineing but not for dead node elimination. - * - * Copies the node by calling copy_node() and then updates the entity if - * it's a local one. env must be a pointer of the frame type of the - * inlined procedure. The new entities must be in the link field of - * the entities. - */ -static INLINE void -copy_node_inline(ir_node *n, void *env) { - ir_node *nn; - ir_type *frame_tp = (ir_type *)env; - - copy_node(n, NULL); - if (is_Sel(n)) { - nn = get_new_node (n); - assert(is_Sel(nn)); - if (get_entity_owner(get_Sel_entity(n)) == frame_tp) { - set_Sel_entity(nn, get_entity_link(get_Sel_entity(n))); - } - } else if (is_Block(n)) { - nn = get_new_node (n); - nn->attr.block.irg = current_ir_graph; - } -} - -/** - * Walker: checks if P_value_arg_base is used. - */ -static void find_addr(ir_node *node, void *env) { - int *allow_inline = env; - if (is_Proj(node) && - is_Start(get_Proj_pred(node)) && - get_Proj_proj(node) == pn_Start_P_value_arg_base) { - *allow_inline = 0; - } -} - -/** - * Check if we can inline a given call. - * Currently, we cannot inline two cases: - * - call with compound arguments - * - graphs that take the address of a parameter - * - * check these conditions here - */ -static int can_inline(ir_node *call, ir_graph *called_graph) { - ir_type *call_type = get_Call_type(call); - int params, ress, i, res; - assert(is_Method_type(call_type)); - - params = get_method_n_params(call_type); - ress = get_method_n_ress(call_type); - - /* check parameters for compound arguments */ - for (i = 0; i < params; ++i) { - ir_type *p_type = get_method_param_type(call_type, i); - - if (is_compound_type(p_type)) - return 0; - } - - /* check results for compound arguments */ - for (i = 0; i < ress; ++i) { - ir_type *r_type = get_method_res_type(call_type, i); - - if (is_compound_type(r_type)) - return 0; - } - - res = 1; - irg_walk_graph(called_graph, find_addr, NULL, &res); - - return res; -} - -enum exc_mode { - exc_handler = 0, /**< There is a handler. */ - exc_to_end = 1, /**< Branches to End. */ - exc_no_handler = 2 /**< Exception handling not represented. */ -}; - -/* Inlines a method at the given call site. */ -int inline_method(ir_node *call, ir_graph *called_graph) { - ir_node *pre_call; - ir_node *post_call, *post_bl; - ir_node *in[pn_Start_max]; - ir_node *end, *end_bl; - ir_node **res_pred; - ir_node **cf_pred; - ir_node *ret, *phi; - int arity, n_ret, n_exc, n_res, i, n, j, rem_opt, irn_arity; - enum exc_mode exc_handling; - ir_type *called_frame, *curr_frame; - irg_inline_property prop = get_irg_inline_property(called_graph); - ir_entity *ent; - - if (prop == irg_inline_forbidden) - return 0; - - ent = get_irg_entity(called_graph); - - /* Do not inline variadic functions. */ - if (get_method_variadicity(get_entity_type(ent)) == variadicity_variadic) - return 0; - - assert(get_method_n_params(get_entity_type(ent)) == - get_method_n_params(get_Call_type(call))); - - /* - * We cannot inline a recursive call. The graph must be copied before - * the call the inline_method() using create_irg_copy(). - */ - if (called_graph == current_ir_graph) - return 0; - - /* - * currently, we cannot inline two cases: - * - call with compound arguments - * - graphs that take the address of a parameter - */ - if (! can_inline(call, called_graph)) - return 0; - - /* -- Turn off optimizations, this can cause problems when allocating new nodes. -- */ - rem_opt = get_opt_optimize(); - set_optimize(0); - - /* Handle graph state */ - assert(get_irg_phase_state(current_ir_graph) != phase_building); - assert(get_irg_pinned(current_ir_graph) == op_pin_state_pinned); - assert(get_irg_pinned(called_graph) == op_pin_state_pinned); - set_irg_outs_inconsistent(current_ir_graph); - set_irg_extblk_inconsistent(current_ir_graph); - set_irg_doms_inconsistent(current_ir_graph); - set_irg_loopinfo_inconsistent(current_ir_graph); - set_irg_callee_info_state(current_ir_graph, irg_callee_info_inconsistent); - - /* -- Check preconditions -- */ - assert(is_Call(call)); - - /* here we know we WILL inline, so inform the statistics */ - hook_inline(call, called_graph); - - /* -- Decide how to handle exception control flow: Is there a handler - for the Call node, or do we branch directly to End on an exception? - exc_handling: - 0 There is a handler. - 1 Branches to End. - 2 Exception handling not represented in Firm. -- */ - { - ir_node *proj, *Mproj = NULL, *Xproj = NULL; - for (proj = get_irn_link(call); proj; proj = get_irn_link(proj)) { - long proj_nr = get_Proj_proj(proj); - if (proj_nr == pn_Call_X_except) Xproj = proj; - if (proj_nr == pn_Call_M_except) Mproj = proj; - } - if (Mproj) { assert(Xproj); exc_handling = exc_handler; } /* Mproj */ - else if (Xproj) { exc_handling = exc_to_end; } /* !Mproj && Xproj */ - else { exc_handling = exc_no_handler; } /* !Mproj && !Xproj */ - } - - /* -- - the procedure and later replaces the Start node of the called graph. - Post_call is the old Call node and collects the results of the called - graph. Both will end up being a tuple. -- */ - post_bl = get_nodes_block(call); - set_irg_current_block(current_ir_graph, post_bl); - /* XxMxPxPxPxT of Start + parameter of Call */ - in[pn_Start_X_initial_exec] = new_Jmp(); - in[pn_Start_M] = get_Call_mem(call); - in[pn_Start_P_frame_base] = get_irg_frame(current_ir_graph); - in[pn_Start_P_globals] = get_irg_globals(current_ir_graph); - in[pn_Start_P_tls] = get_irg_tls(current_ir_graph); - in[pn_Start_T_args] = new_Tuple(get_Call_n_params(call), get_Call_param_arr(call)); - /* in[pn_Start_P_value_arg_base] = ??? */ - assert(pn_Start_P_value_arg_base == pn_Start_max - 1 && "pn_Start_P_value_arg_base not supported, fix"); - pre_call = new_Tuple(pn_Start_max - 1, in); - post_call = call; - - /* -- - The new block gets the ins of the old block, pre_call and all its - predecessors and all Phi nodes. -- */ - part_block(pre_call); - - /* -- Prepare state for dead node elimination -- */ - /* Visited flags in calling irg must be >= flag in called irg. - Else walker and arity computation will not work. */ - if (get_irg_visited(current_ir_graph) <= get_irg_visited(called_graph)) - set_irg_visited(current_ir_graph, get_irg_visited(called_graph)+1); - if (get_irg_block_visited(current_ir_graph)< get_irg_block_visited(called_graph)) - set_irg_block_visited(current_ir_graph, get_irg_block_visited(called_graph)); - /* Set pre_call as new Start node in link field of the start node of - calling graph and pre_calls block as new block for the start block - of calling graph. - Further mark these nodes so that they are not visited by the - copying. */ - set_irn_link(get_irg_start(called_graph), pre_call); - set_irn_visited(get_irg_start(called_graph), get_irg_visited(current_ir_graph)); - set_irn_link(get_irg_start_block(called_graph), get_nodes_block(pre_call)); - set_irn_visited(get_irg_start_block(called_graph), get_irg_visited(current_ir_graph)); - set_irn_link(get_irg_bad(called_graph), get_irg_bad(current_ir_graph)); - set_irn_visited(get_irg_bad(called_graph), get_irg_visited(current_ir_graph)); - - /* Initialize for compaction of in arrays */ - inc_irg_block_visited(current_ir_graph); - - /* -- Replicate local entities of the called_graph -- */ - /* copy the entities. */ - called_frame = get_irg_frame_type(called_graph); - curr_frame = get_irg_frame_type(current_ir_graph); - for (i = 0, n = get_class_n_members(called_frame); i < n; ++i) { - ir_entity *new_ent, *old_ent; - old_ent = get_class_member(called_frame, i); - new_ent = copy_entity_own(old_ent, curr_frame); - set_entity_link(old_ent, new_ent); - } - - /* visited is > than that of called graph. With this trick visited will - remain unchanged so that an outer walker, e.g., searching the call nodes - to inline, calling this inline will not visit the inlined nodes. */ - set_irg_visited(current_ir_graph, get_irg_visited(current_ir_graph)-1); - - /* -- Performing dead node elimination inlines the graph -- */ - /* Copies the nodes to the obstack of current_ir_graph. Updates links to new - entities. */ - irg_walk(get_irg_end(called_graph), copy_node_inline, copy_preds, - get_irg_frame_type(called_graph)); - - /* Repair called_graph */ - set_irg_visited(called_graph, get_irg_visited(current_ir_graph)); - set_irg_block_visited(called_graph, get_irg_block_visited(current_ir_graph)); - set_Block_block_visited(get_irg_start_block(called_graph), 0); - - /* -- Merge the end of the inlined procedure with the call site -- */ - /* We will turn the old Call node into a Tuple with the following - predecessors: - -1: Block of Tuple. - 0: Phi of all Memories of Return statements. - 1: Jmp from new Block that merges the control flow from all exception - predecessors of the old end block. - 2: Tuple of all arguments. - 3: Phi of Exception memories. - In case the old Call directly branches to End on an exception we don't - need the block merging all exceptions nor the Phi of the exception - memories. - */ - - /* -- Precompute some values -- */ - end_bl = get_new_node(get_irg_end_block(called_graph)); - end = get_new_node(get_irg_end(called_graph)); - arity = get_irn_arity(end_bl); /* arity = n_exc + n_ret */ - n_res = get_method_n_ress(get_Call_type(call)); - - res_pred = xmalloc(n_res * sizeof(*res_pred)); - cf_pred = xmalloc(arity * sizeof(*res_pred)); - - set_irg_current_block(current_ir_graph, post_bl); /* just to make sure */ - - /* -- archive keepalives -- */ - irn_arity = get_irn_arity(end); - for (i = 0; i < irn_arity; i++) { - ir_node *ka = get_End_keepalive(end, i); - if (! is_Bad(ka)) - add_End_keepalive(get_irg_end(current_ir_graph), ka); - } - - /* The new end node will die. We need not free as the in array is on the obstack: - copy_node() only generated 'D' arrays. */ - - /* -- Replace Return nodes by Jump nodes. -- */ - n_ret = 0; - for (i = 0; i < arity; i++) { - ir_node *ret; - ret = get_irn_n(end_bl, i); - if (is_Return(ret)) { - cf_pred[n_ret] = new_r_Jmp(current_ir_graph, get_nodes_block(ret)); - n_ret++; - } - } - set_irn_in(post_bl, n_ret, cf_pred); - - /* -- Build a Tuple for all results of the method. - Add Phi node if there was more than one Return. -- */ - turn_into_tuple(post_call, pn_Call_max); - /* First the Memory-Phi */ - n_ret = 0; - for (i = 0; i < arity; i++) { - ret = get_irn_n(end_bl, i); - if (is_Return(ret)) { - cf_pred[n_ret] = get_Return_mem(ret); - n_ret++; - } - } - phi = new_Phi(n_ret, cf_pred, mode_M); - set_Tuple_pred(call, pn_Call_M_regular, phi); - /* Conserve Phi-list for further inlinings -- but might be optimized */ - if (get_nodes_block(phi) == post_bl) { - set_irn_link(phi, get_irn_link(post_bl)); - set_irn_link(post_bl, phi); - } - /* Now the real results */ - if (n_res > 0) { - for (j = 0; j < n_res; j++) { - n_ret = 0; - for (i = 0; i < arity; i++) { - ret = get_irn_n(end_bl, i); - if (is_Return(ret)) { - cf_pred[n_ret] = get_Return_res(ret, j); - n_ret++; - } - } - if (n_ret > 0) - phi = new_Phi(n_ret, cf_pred, get_irn_mode(cf_pred[0])); - else - phi = new_Bad(); - res_pred[j] = phi; - /* Conserve Phi-list for further inlinings -- but might be optimized */ - if (get_nodes_block(phi) == post_bl) { - set_Phi_next(phi, get_Block_phis(post_bl)); - set_Block_phis(post_bl, phi); - } - } - set_Tuple_pred(call, pn_Call_T_result, new_Tuple(n_res, res_pred)); - } else { - set_Tuple_pred(call, pn_Call_T_result, new_Bad()); - } - /* handle the regular call */ - set_Tuple_pred(call, pn_Call_X_regular, new_Jmp()); - - /* For now, we cannot inline calls with value_base */ - set_Tuple_pred(call, pn_Call_P_value_res_base, new_Bad()); - - /* Finally the exception control flow. - We have two (three) possible situations: - First if the Call branches to an exception handler: We need to add a Phi node to - collect the memory containing the exception objects. Further we need - to add another block to get a correct representation of this Phi. To - this block we add a Jmp that resolves into the X output of the Call - when the Call is turned into a tuple. - Second the Call branches to End, the exception is not handled. Just - add all inlined exception branches to the End node. - Third: there is no Exception edge at all. Handle as case two. */ - if (exc_handling == exc_handler) { - n_exc = 0; - for (i = 0; i < arity; i++) { - ir_node *ret, *irn; - ret = get_irn_n(end_bl, i); - irn = skip_Proj(ret); - if (is_fragile_op(irn) || is_Raise(irn)) { - cf_pred[n_exc] = ret; - ++n_exc; - } - } - if (n_exc > 0) { - new_Block(n_exc, cf_pred); /* watch it: current_block is changed! */ - set_Tuple_pred(call, pn_Call_X_except, new_Jmp()); - /* The Phi for the memories with the exception objects */ - n_exc = 0; - for (i = 0; i < arity; i++) { - ir_node *ret; - ret = skip_Proj(get_irn_n(end_bl, i)); - if (is_Call(ret)) { - cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_block(ret), ret, mode_M, 3); - n_exc++; - } else if (is_fragile_op(ret)) { - /* We rely that all cfops have the memory output at the same position. */ - cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_block(ret), ret, mode_M, 0); - n_exc++; - } else if (is_Raise(ret)) { - cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_block(ret), ret, mode_M, 1); - n_exc++; - } - } - set_Tuple_pred(call, pn_Call_M_except, new_Phi(n_exc, cf_pred, mode_M)); - } else { - set_Tuple_pred(call, pn_Call_X_except, new_Bad()); - set_Tuple_pred(call, pn_Call_M_except, new_Bad()); - } - } else { - ir_node *main_end_bl; - int main_end_bl_arity; - ir_node **end_preds; - - /* assert(exc_handling == 1 || no exceptions. ) */ - n_exc = 0; - for (i = 0; i < arity; i++) { - ir_node *ret = get_irn_n(end_bl, i); - ir_node *irn = skip_Proj(ret); - - if (is_fragile_op(irn) || is_Raise(irn)) { - cf_pred[n_exc] = ret; - n_exc++; - } - } - main_end_bl = get_irg_end_block(current_ir_graph); - main_end_bl_arity = get_irn_arity(main_end_bl); - end_preds = xmalloc((n_exc + main_end_bl_arity) * sizeof(*end_preds)); - - for (i = 0; i < main_end_bl_arity; ++i) - end_preds[i] = get_irn_n(main_end_bl, i); - for (i = 0; i < n_exc; ++i) - end_preds[main_end_bl_arity + i] = cf_pred[i]; - set_irn_in(main_end_bl, n_exc + main_end_bl_arity, end_preds); - set_Tuple_pred(call, pn_Call_X_except, new_Bad()); - set_Tuple_pred(call, pn_Call_M_except, new_Bad()); - free(end_preds); - } - free(res_pred); - free(cf_pred); - - /* -- Turn CSE back on. -- */ - set_optimize(rem_opt); - - return 1; -} - -/********************************************************************/ -/* Apply inlineing to small methods. */ -/********************************************************************/ - -/** Represents a possible inlinable call in a graph. */ -typedef struct _call_entry call_entry; -struct _call_entry { - ir_node *call; /**< the Call */ - ir_graph *callee; /**< the callee called here */ - call_entry *next; /**< for linking the next one */ - unsigned weight; /**< the weight of the call */ -}; - -/** - * environment for inlining small irgs - */ -typedef struct _inline_env_t { - struct obstack obst; /**< an obstack where call_entries are allocated on. */ - call_entry *head; /**< the head of the call entry list */ - call_entry *tail; /**< the tail of the call entry list */ -} inline_env_t; - -/** - * Returns the irg called from a Call node. If the irg is not - * known, NULL is returned. - * - * @param call the call node - */ -static ir_graph *get_call_called_irg(ir_node *call) { - ir_node *addr; - - addr = get_Call_ptr(call); - if (is_Global(addr)) { - ir_entity *ent = get_Global_entity(addr); - return get_entity_irg(ent); - } - - return NULL; -} - -/** - * Walker: Collect all calls to known graphs inside a graph. - */ -static void collect_calls(ir_node *call, void *env) { - if (is_Call(call)) { - ir_graph *called_irg = get_call_called_irg(call); - - if (called_irg != NULL) { - /* The Call node calls a locally defined method. Remember to inline. */ - inline_env_t *ienv = env; - call_entry *entry = obstack_alloc(&ienv->obst, sizeof(*entry)); - entry->call = call; - entry->callee = called_irg; - entry->next = NULL; - entry->weight = 0; - - if (ienv->tail == NULL) - ienv->head = entry; - else - ienv->tail->next = entry; - ienv->tail = entry; - } - } -} - -/** - * Inlines all small methods at call sites where the called address comes - * from a Const node that references the entity representing the called - * method. - * The size argument is a rough measure for the code size of the method: - * Methods where the obstack containing the firm graph is smaller than - * size are inlined. - */ -void inline_small_irgs(ir_graph *irg, int size) { - ir_graph *rem = current_ir_graph; - inline_env_t env; - call_entry *entry; - DEBUG_ONLY(firm_dbg_module_t *dbg;) + del_pdeq(waitq); + ir_free_resources(irg, IR_RESOURCE_IRN_LINK); - FIRM_DBG_REGISTER(dbg, "firm.opt.inline"); + /* disable unreachable code elimination */ + clear_irg_constraints(irg, IR_GRAPH_CONSTRAINT_OPTIMIZE_UNREACHABLE_CODE); + add_irg_properties(irg, IR_GRAPH_PROPERTY_NO_UNREACHABLE_CODE); - current_ir_graph = irg; - /* Handle graph state */ - assert(get_irg_phase_state(irg) != phase_building); - free_callee_info(irg); + /* invalidate infos */ + clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE); + clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO); + edges_deactivate(irg); - /* Find Call nodes to inline. - (We can not inline during a walk of the graph, as inlineing the same - method several times changes the visited flag of the walked graph: - after the first inlineing visited of the callee equals visited of - the caller. With the next inlineing both are increased.) */ - obstack_init(&env.obst); - env.head = env.tail = NULL; - irg_walk_graph(irg, NULL, collect_calls, &env); + /* Finally kill BAD and doublets from the keep alives. + * Doing this AFTER edges where deactivated saves cycles */ + end = get_irg_end(irg); + remove_End_Bads_and_doublets(end); - if (env.head != NULL) { - /* There are calls to inline */ - collect_phiprojs(irg); - for (entry = env.head; entry != NULL; entry = entry->next) { - ir_graph *callee = entry->callee; - if (((_obstack_memory_used(callee->obst) - (int)obstack_room(callee->obst)) < size) || - (get_irg_inline_property(callee) >= irg_inline_forced)) { - inline_method(entry->call, callee); - } - } - } - obstack_free(&env.obst, NULL); current_ir_graph = rem; -} -/** - * Environment for inlining irgs. - */ -typedef struct { - int n_nodes; /**< Number of nodes in graph except Id, Tuple, Proj, Start, End. */ - int n_nodes_orig; /**< for statistics */ - call_entry *call_head; /**< The head of the list of all call nodes in this graph. */ - call_entry *call_tail; /**< The tail of the list of all call nodes in this graph .*/ - int n_call_nodes; /**< Number of Call nodes in the graph. */ - int n_call_nodes_orig; /**< for statistics */ - int n_callers; /**< Number of known graphs that call this graphs. */ - int n_callers_orig; /**< for statistics */ - int got_inline; /**< Set, if at leat one call inside this graph was inlined. */ -} inline_irg_env; - -/** - * Allocate a new environment for inlining. - */ -static inline_irg_env *alloc_inline_irg_env(struct obstack *obst) { - inline_irg_env *env = obstack_alloc(obst, sizeof(*env)); - env->n_nodes = -2; /* do not count count Start, End */ - env->n_nodes_orig = -2; /* do not count Start, End */ - env->call_head = NULL; - env->call_tail = NULL; - env->n_call_nodes = 0; - env->n_call_nodes_orig = 0; - env->n_callers = 0; - env->n_callers_orig = 0; - env->got_inline = 0; - return env; + /* Note we do not have a reliable way to detect changes, since some + * localopt rules change the inputs of a node and do not return a new + * node, so we conservatively say true here */ + return true; } -typedef struct walker_env { - struct obstack *obst; /**< the obstack for allocations. */ - inline_irg_env *x; /**< the inline environment */ - char ignore_runtime; /**< the ignore runtime flag */ - char ignore_callers; /**< if set, do change callers data */ -} wenv_t; - -/** - * post-walker: collect all calls in the inline-environment - * of a graph and sum some statistics. - */ -static void collect_calls2(ir_node *call, void *ctx) { - wenv_t *env = ctx; - inline_irg_env *x = env->x; - ir_opcode code = get_irn_opcode(call); - ir_graph *callee; - call_entry *entry; - - /* count meaningful nodes in irg */ - if (code != iro_Proj && code != iro_Tuple && code != iro_Sync) { - ++x->n_nodes; - ++x->n_nodes_orig; - } - - if (code != iro_Call) return; - - /* check, if it's a runtime call */ - if (env->ignore_runtime) { - ir_node *symc = get_Call_ptr(call); - - if (is_Global(symc)) { - ir_entity *ent = get_Global_entity(symc); - - if (get_entity_additional_properties(ent) & mtp_property_runtime) - return; - } - } - - /* collect all call nodes */ - ++x->n_call_nodes; - ++x->n_call_nodes_orig; - - callee = get_call_called_irg(call); - if (callee != NULL) { - if (! env->ignore_callers) { - inline_irg_env *callee_env = get_irg_link(callee); - /* count all static callers */ - ++callee_env->n_callers; - ++callee_env->n_callers_orig; - } - - /* link it in the list of possible inlinable entries */ - entry = obstack_alloc(env->obst, sizeof(*entry)); - entry->call = call; - entry->callee = callee; - entry->next = NULL; - if (x->call_tail == NULL) - x->call_head = entry; - else - x->call_tail->next = entry; - x->call_tail = entry; - } -} - -/** - * Returns TRUE if the number of callers is 0 in the irg's environment, - * hence this irg is a leave. - */ -INLINE static int is_leave(ir_graph *irg) { - inline_irg_env *env = get_irg_link(irg); - return env->n_call_nodes == 0; -} - -/** - * Returns TRUE if the number of nodes in the callee is - * smaller then size in the irg's environment. - */ -INLINE static int is_smaller(ir_graph *callee, int size) { - inline_irg_env *env = get_irg_link(callee); - return env->n_nodes < size; -} - -/** - * Append the nodes of the list src to the nodes of the list in environment dst. - */ -static void append_call_list(struct obstack *obst, inline_irg_env *dst, call_entry *src) { - call_entry *entry, *nentry; +void local_opts_const_code(void) +{ + ir_graph *irg = get_const_code_irg(); + /* Clean the value_table in irg for the CSE. */ + new_identities(irg); - /* Note that the src list points to Call nodes in the inlined graph, but - we need Call nodes in our graph. Luckily the inliner leaves this information - in the link field. */ - for (entry = src; entry != NULL; entry = entry->next) { - nentry = obstack_alloc(obst, sizeof(*nentry)); - nentry->call = get_irn_link(entry->call); - nentry->callee = entry->callee; - nentry->next = NULL; - dst->call_tail->next = nentry; - dst->call_tail = nentry; - } + walk_const_code(firm_clear_link, optimize_in_place_wrapper, NULL); } -/* - * Inlines small leave methods at call sites where the called address comes - * from a Const node that references the entity representing the called - * method. - * The size argument is a rough measure for the code size of the method: - * Methods where the obstack containing the firm graph is smaller than - * size are inlined. - */ -void inline_leave_functions(int maxsize, int leavesize, int size, int ignore_runtime) { - inline_irg_env *env; - ir_graph *irg; - int i, n_irgs; - ir_graph *rem; - int did_inline; - wenv_t wenv; - call_entry *entry, *tail; - const call_entry *centry; - struct obstack obst; - pmap *copied_graphs; - pmap_entry *pm_entry; - DEBUG_ONLY(firm_dbg_module_t *dbg;) - - FIRM_DBG_REGISTER(dbg, "firm.opt.inline"); - rem = current_ir_graph; - obstack_init(&obst); - - /* a map for the copied graphs, used to inline recursive calls */ - copied_graphs = pmap_create(); - - /* extend all irgs by a temporary data structure for inlining. */ - n_irgs = get_irp_n_irgs(); - for (i = 0; i < n_irgs; ++i) - set_irg_link(get_irp_irg(i), alloc_inline_irg_env(&obst)); - - /* Precompute information in temporary data structure. */ - wenv.obst = &obst; - wenv.ignore_runtime = ignore_runtime; - wenv.ignore_callers = 0; - for (i = 0; i < n_irgs; ++i) { - ir_graph *irg = get_irp_irg(i); - - assert(get_irg_phase_state(irg) != phase_building); - free_callee_info(irg); - - wenv.x = get_irg_link(irg); - irg_walk_graph(irg, NULL, collect_calls2, &wenv); - } - - /* -- and now inline. -- */ - - /* Inline leaves recursively -- we might construct new leaves. */ - do { - did_inline = 0; - - for (i = 0; i < n_irgs; ++i) { - ir_node *call; - int phiproj_computed = 0; - - current_ir_graph = get_irp_irg(i); - env = (inline_irg_env *)get_irg_link(current_ir_graph); - - tail = NULL; - for (entry = env->call_head; entry != NULL; entry = entry->next) { - ir_graph *callee; - - if (env->n_nodes > maxsize) break; - - call = entry->call; - callee = entry->callee; - - if (is_leave(callee) && ( - is_smaller(callee, leavesize) || (get_irg_inline_property(callee) >= irg_inline_forced))) { - if (!phiproj_computed) { - phiproj_computed = 1; - collect_phiprojs(current_ir_graph); - } - did_inline = inline_method(call, callee); - - if (did_inline) { - inline_irg_env *callee_env = (inline_irg_env *)get_irg_link(callee); - - /* was inlined, must be recomputed */ - phiproj_computed = 0; - - /* Do some statistics */ - env->got_inline = 1; - --env->n_call_nodes; - env->n_nodes += callee_env->n_nodes; - --callee_env->n_callers; - - /* remove this call from the list */ - if (tail != NULL) - tail->next = entry->next; - else - env->call_head = entry->next; - continue; - } - } - tail = entry; - } - env->call_tail = tail; - } - } while (did_inline); - - /* inline other small functions. */ - for (i = 0; i < n_irgs; ++i) { - ir_node *call; - int phiproj_computed = 0; - - current_ir_graph = get_irp_irg(i); - env = (inline_irg_env *)get_irg_link(current_ir_graph); - - /* note that the list of possible calls is updated during the process */ - tail = NULL; - for (entry = env->call_head; entry != NULL; entry = entry->next) { - ir_graph *callee; - pmap_entry *e; - - call = entry->call; - callee = entry->callee; - - e = pmap_find(copied_graphs, callee); - if (e != NULL) { - /* - * Remap callee if we have a copy. - * FIXME: Should we do this only for recursive Calls ? - */ - callee = e->value; - } - - if (((is_smaller(callee, size) && (env->n_nodes < maxsize)) || /* small function */ - (get_irg_inline_property(callee) >= irg_inline_forced))) { - if (current_ir_graph == callee) { - /* - * Recursive call: we cannot directly inline because we cannot walk - * the graph and change it. So we have to make a copy of the graph - * first. - */ - - inline_irg_env *callee_env; - ir_graph *copy; - - /* - * No copy yet, create one. - * Note that recursive methods are never leaves, so it is sufficient - * to test this condition here. - */ - copy = create_irg_copy(callee); - - /* create_irg_copy() destroys the Proj links, recompute them */ - phiproj_computed = 0; - - /* allocate new environment */ - callee_env = alloc_inline_irg_env(&obst); - set_irg_link(copy, callee_env); - - wenv.x = callee_env; - wenv.ignore_callers = 1; - irg_walk_graph(copy, NULL, collect_calls2, &wenv); - - /* - * Enter the entity of the original graph. This is needed - * for inline_method(). However, note that ent->irg still points - * to callee, NOT to copy. - */ - set_irg_entity(copy, get_irg_entity(callee)); - - pmap_insert(copied_graphs, callee, copy); - callee = copy; - - /* we have only one caller: the original graph */ - callee_env->n_callers = 1; - callee_env->n_callers_orig = 1; - } - if (! phiproj_computed) { - phiproj_computed = 1; - collect_phiprojs(current_ir_graph); - } - did_inline = inline_method(call, callee); - if (did_inline) { - inline_irg_env *callee_env = (inline_irg_env *)get_irg_link(callee); - - /* was inlined, must be recomputed */ - phiproj_computed = 0; - - /* callee was inline. Append it's call list. */ - env->got_inline = 1; - --env->n_call_nodes; - append_call_list(&obst, env, callee_env->call_head); - env->n_call_nodes += callee_env->n_call_nodes; - env->n_nodes += callee_env->n_nodes; - --callee_env->n_callers; - - /* after we have inlined callee, all called methods inside callee - are now called once more */ - for (centry = callee_env->call_head; centry != NULL; centry = centry->next) { - inline_irg_env *penv = get_irg_link(centry->callee); - ++penv->n_callers; - } - - /* remove this call from the list */ - if (tail != NULL) - tail->next = entry->next; - else - env->call_head = entry->next; - continue; - } - } - tail = entry; - } - env->call_tail = tail; - } - - for (i = 0; i < n_irgs; ++i) { - irg = get_irp_irg(i); - env = (inline_irg_env *)get_irg_link(irg); - - if (env->got_inline) { - /* this irg got calls inlined */ - set_irg_outs_inconsistent(irg); - set_irg_doms_inconsistent(irg); - - optimize_graph_df(irg); - optimize_cf(irg); - } - if (env->got_inline || (env->n_callers_orig != env->n_callers)) { - DB((dbg, SET_LEVEL_1, "Nodes:%3d ->%3d, calls:%3d ->%3d, callers:%3d ->%3d, -- %s\n", - env->n_nodes_orig, env->n_nodes, env->n_call_nodes_orig, env->n_call_nodes, - env->n_callers_orig, env->n_callers, - get_entity_name(get_irg_entity(irg)))); - } - } - - /* kill the copied graphs: we don't need them anymore */ - foreach_pmap(copied_graphs, pm_entry) { - ir_graph *copy = pm_entry->value; - - /* reset the entity, otherwise it will be deleted in the next step ... */ - set_irg_entity(copy, NULL); - free_ir_graph(copy); - } - pmap_destroy(copied_graphs); - - obstack_free(&obst, NULL); - current_ir_graph = rem; +ir_graph_pass_t *optimize_graph_df_pass(const char *name) +{ + return def_graph_pass_ret(name ? name : "optimize_graph_df", optimize_graph_df); }