-/* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
-** All rights reserved.
-**
-** Author: Christian Schaefer
-**
-** dead node elimination
-** walks one time through the whole graph and copies it into another graph,
-** so unreachable nodes will be lost.
-*/
-
-# include "irgopt.h"
-# include "irnode.h"
-# include "iropt.h"
-# include "irgwalk.h"
-# include "irgraph.h"
-# include "ircons.h"
+/*
+ * Project: libFIRM
+ * File name: ir/ir/irgopt.c
+ * Purpose: Optimizations for a whole ir graph, i.e., a procedure.
+ * Author: Christian Schaefer, Goetz Lindenmaier
+ * Modified by: Sebastian Felis
+ * Created:
+ * CVS-ID: $Id$
+ * Copyright: (c) 1998-2003 Universität Karlsruhe
+ * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ */
-/********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <assert.h>
+
+#include "irnode_t.h"
+#include "irgraph_t.h"
+#include "irprog_t.h"
+
+#include "ircons.h"
+#include "iropt_t.h"
+#include "irgopt.h"
+#include "irgmod.h"
+#include "irgwalk.h"
+
+#include "array.h"
+#include "pset.h"
+#include "eset.h"
+#include "pdeq.h" /* Fuer code placement */
+#include "xmalloc.h"
+
+#include "irouts.h"
+#include "irloop_t.h"
+#include "irbackedge_t.h"
+#include "cgana.h"
+#include "trouts.h"
+
+#include "irflag_t.h"
+#include "irhooks.h"
+#include "iredges_t.h"
+#include "irtools.h"
+
+/* Defined in iropt.c */
+pset *new_identities (void);
+void del_identities (pset *value_table);
+void add_identities (pset *value_table, ir_node *node);
+
+/*------------------------------------------------------------------*/
/* apply optimizations of iropt to all nodes. */
-void
+/*------------------------------------------------------------------*/
+
+static void init_link (ir_node *n, void *env) {
+ set_irn_link(n, NULL);
+}
+
+#if 0 /* Old version. Avoids Ids.
+ This is not necessary: we do a post walk, and get_irn_n
+ removes ids anyways. So it's much cheaper to call the
+ optimization less often and use the exchange() algorithm. */
+static void
optimize_in_place_wrapper (ir_node *n, void *env) {
- int i;
- ir_node *optimized;
+ int i, irn_arity;
+ ir_node *optimized, *old;
- /* optimize all sons after recursion, i.e., the sons' sons are
- optimized already. */
- for (i = -1; i < get_irn_arity(n); i++) {
- optimized = optimize_in_place(get_irn_n(n, i));
+ irn_arity = get_irn_arity(n);
+ for (i = 0; i < irn_arity; i++) {
+ /* get_irn_n skips Id nodes, so comparison old != optimized does not
+ show all optimizations. Therefore always set new predecessor. */
+ old = get_irn_intra_n(n, i);
+ optimized = optimize_in_place_2(old);
set_irn_n(n, i, optimized);
}
+
+ if (get_irn_op(n) == op_Block) {
+ optimized = optimize_in_place_2(n);
+ if (optimized != n) exchange (n, optimized);
+ }
+}
+#else
+static void
+optimize_in_place_wrapper (ir_node *n, void *env) {
+ ir_node *optimized = optimize_in_place_2(n);
+ if (optimized != n) exchange (n, optimized);
+}
+#endif
+
+
+static INLINE void do_local_optimize(ir_node *n) {
+ /* Handle graph state */
+ assert(get_irg_phase_state(current_ir_graph) != phase_building);
+
+ if (get_opt_global_cse())
+ set_irg_pinned(current_ir_graph, op_pin_state_floats);
+ if (get_irg_outs_state(current_ir_graph) == outs_consistent)
+ set_irg_outs_inconsistent(current_ir_graph);
+ if (get_irg_dom_state(current_ir_graph) == dom_consistent)
+ set_irg_dom_inconsistent(current_ir_graph);
+ set_irg_loopinfo_inconsistent(current_ir_graph);
+
+ /* Clean the value_table in irg for the CSE. */
+ del_identities(current_ir_graph->value_table);
+ current_ir_graph->value_table = new_identities();
+
+ /* walk over the graph */
+ irg_walk(n, init_link, optimize_in_place_wrapper, NULL);
}
+void local_optimize_node(ir_node *n) {
+ ir_graph *rem = current_ir_graph;
+ current_ir_graph = get_irn_irg(n);
+
+ do_local_optimize(n);
+
+ current_ir_graph = rem;
+}
+
+/**
+ * Block-Walker: uses dominance depth to mark dead blocks.
+ */
+static void kill_dead_blocks(ir_node *block, void *env)
+{
+ if (get_Block_dom_depth(block) < 0)
+ set_Block_dead(block);
+}
void
local_optimize_graph (ir_graph *irg) {
ir_graph *rem = current_ir_graph;
current_ir_graph = irg;
- /* walk over the graph */
- irg_walk(irg->end, NULL, optimize_in_place_wrapper, NULL);
+ if (get_irg_dom_state(current_ir_graph) == dom_consistent)
+ irg_block_walk_graph(irg, NULL, kill_dead_blocks, NULL);
+
+ do_local_optimize(irg->end);
current_ir_graph = rem;
}
-/********************************************************************/
+
+/*------------------------------------------------------------------*/
/* Routines for dead node elimination / copying garbage collection */
/* of the obstack. */
+/*------------------------------------------------------------------*/
-/* Remeber the new node in the old node,
- by using a field that all nodes have. */
-void *
+/**
+ * Remember the new node in the old node by using a field all nodes have.
+ */
+static INLINE void
set_new_node (ir_node *old, ir_node *new)
{
- old->in[0] = new; /* Hi Chris: Benutze old->link, ich hab mich vergewissert dass
- das hier ueberschrieben werden kann, das erspaart eine
- indirektion --> schneller. */
- return old;
+ old->link = new;
}
-/* Get this new node, before the old node is forgotton.*/
-ir_node *
-get_new_node (ir_node * n)
-{
- ir_node *new;
- new = n->in[0];
- assert(new);
-
- return new;
+/**
+ * Get this new node, before the old node is forgotten.
+ */
+static INLINE ir_node *
+get_new_node (ir_node * n) {
+ return n->link;
}
-/* Create this node on a new obstack. */
-void
-copy_node (ir_node *n, void *env) {
- ir_node *res = NULL;
- ir_node *a = NULL;
- ir_node *b = NULL;
- int i;
-
- assert (n);
- DDMSG2(n);
+/**
+ * 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;
- if (is_binop(n)) {
- a = get_binop_left(n);
- b = get_binop_right(n);
- } else if (is_unop(n)) {
- a = get_unop_op(n);
+ 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 (get_irn_opcode(get_irn_n(b, i)) == iro_Bad) res--;
+ /* save it in the flag. */
+ set_Block_block_visited(b, irg_v + res);
+ return res;
}
+}
- switch (get_irn_opcode(n)) {
+/* TODO: add an ir_op operation */
+static INLINE void new_backedge_info(ir_node *n) {
+ switch(get_irn_opcode(n)) {
case iro_Block:
- {
- ir_node **in = get_Block_cfgpred_arr(n);
- for (i = 0; i < get_Block_n_cfgpreds(n); i++)
- set_Block_cfgpred(n, i, get_new_node(get_Block_cfgpred(n, i)));
- res = new_r_Block (current_ir_graph, get_Block_n_cfgpreds(n), in);
- }
- break;
- case iro_Start:
- res = new_r_Start (current_ir_graph, get_new_node(get_nodes_Block(n)));
- break;
- case iro_End:
- res = new_r_End (current_ir_graph, get_new_node(get_nodes_Block(n)));
- current_ir_graph -> end = res;
- current_ir_graph -> end_block = get_nodes_Block(res);
- break;
- case iro_Jmp:
- res = new_r_Jmp (current_ir_graph, get_new_node(get_nodes_Block(n)));
- break;
- case iro_Cond:
- res = new_r_Cond (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Cond_selector(n)));
+ n->attr.block.cg_backedge = NULL;
+ n->attr.block.backedge = new_backedge_arr(current_ir_graph->obst, get_irn_arity(n));
break;
- case iro_Return:
- {
- ir_node **in;
- in = get_Return_res_arr(n);
- for (i = 0; i < get_Return_n_res(n); i++) {
- set_Return_res(n, i, get_new_node(get_Return_res(n, i)));
- }
- res = new_r_Return (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Return_mem(n)),
- get_Return_n_res(n), in);
- }
- break;
- case iro_Raise:
- res = new_r_Raise (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Raise_mem(n)),
- get_new_node(get_Raise_exo_ptr(n)));
+ case iro_Phi:
+ n->attr.phi_backedge = new_backedge_arr(current_ir_graph->obst, get_irn_arity(n));
break;
- case iro_Const:
- res = new_r_Const (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_irn_mode(n), get_Const_tarval(n));
+ case iro_Filter:
+ n->attr.filter.backedge = new_backedge_arr(current_ir_graph->obst, get_irn_arity(n));
break;
- case iro_SymConst:
- {
- type_or_id *value = NULL;
+ default: ;
+ }
+}
- if ((get_SymConst_kind(n)==type_tag) || (get_SymConst_kind(n)==size))
- {
+/**
+ * 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);
+ int copy_node_nr = env != NULL;
- value = (type_or_id *) get_SymConst_type(n);
- }
- else
- {
- if (get_SymConst_kind(n)==linkage_ptr_info)
- {
- value = (type_or_id *) get_SymConst_ptrinfo(n);
- }
- }
- res = new_r_SymConst (current_ir_graph, get_new_node(get_nodes_Block(n)),
- value, get_SymConst_kind (n));
- }
- break;
- case iro_Sel:
- {
- ir_node **in = get_Sel_index_arr(n);
- for (i = 0; i < get_Sel_n_index(n); i++)
- set_Sel_index(n, i, get_new_node(get_Sel_index(n, i)));
- res = new_r_Sel (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Sel_mem(n)),
- get_new_node(get_Sel_ptr(n)), get_Sel_n_index(n),
- in, get_Sel_entity(n));
- }
- break;
- case iro_Call:
- {
- ir_node **in = get_Call_param_arr(n);
- for (i = 0; i < get_Call_arity(n); i++)
- set_Call_param(n, i, get_new_node(get_Call_param(n, i)));
- res = new_r_Call (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Call_mem(n)),
- get_new_node(get_Call_ptr(n)), get_Call_arity(n),
- in, get_Call_type (n));
- }
- break;
- case iro_Add:
- res = new_r_Add (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(a), get_new_node(b), get_irn_mode(n));
- break;
- case iro_Sub:
- {
- res = new_r_Sub (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(a), get_new_node(b), get_irn_mode(n));
+ /* The end node looses it's flexible in array. This doesn't matter,
+ as dead node elimination builds End by hand, inlineing doesn't use
+ the End node. */
+ /* assert(op == op_End || ((_ARR_DESCR(n->in))->cookie != ARR_F_MAGIC)); */
+
+ 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);
}
- break;
- case iro_Minus:
- res = new_r_Minus (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(a), get_irn_mode(n));
- break;
- case iro_Mul:
- res = new_r_Mul (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(a), get_new_node(b), get_irn_mode(n));
- break;
- case iro_Quot:
- res = new_r_Quot (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Quot_mem(n)), get_new_node(a),
- get_new_node(b));
- break;
- case iro_DivMod:
- res = new_r_DivMod (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_DivMod_mem(n)), get_new_node(a),
- get_new_node(b));
- break;
- case iro_Div:
- res = new_r_Div (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Div_mem(n)), get_new_node(a),
- get_new_node(b));
- break;
- case iro_Mod:
- res = new_r_Mod (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Mod_mem(n)), get_new_node(a),
- get_new_node(b));
- break;
- case iro_Abs:
- res = new_r_Abs (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Abs_op(n)), get_irn_mode(n));
- break;
- case iro_And:
- res = new_r_And (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(a), get_new_node(b), get_irn_mode(n));
- break;
- case iro_Or:
- res = new_r_Or (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(a), get_new_node(b), get_irn_mode(n));
- break;
- case iro_Eor:
- res = new_r_Eor (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(a), get_new_node(b), get_irn_mode(n));
- break;
- case iro_Not:
- res = new_r_Not (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Not_op(n)), get_irn_mode(n));
- break;
- case iro_Cmp:
- res = new_r_Cmp (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Cmp_left(n)),
- get_new_node(get_Cmp_right(n)));
- break;
- case iro_Shl:
- res = new_r_Shl (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Shl_left(n)),
- get_new_node(get_Shl_right(n)), get_irn_mode(n));
- break;
- case iro_Shr:
- res = new_r_Shr (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Shr_left(n)),
- get_new_node(get_Shr_right(n)), get_irn_mode(n));
- break;
- case iro_Shrs:
- res = new_r_Shrs (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Shrs_left(n)),
- get_new_node(get_Shrs_right(n)), get_irn_mode(n));
- break;
- case iro_Rot:
- res = new_r_Rot (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Rot_left(n)),
- get_new_node(get_Rot_right(n)), get_irn_mode(n));
- break;
- case iro_Conv:
- res = new_r_Conv (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Conv_op(n)),
- get_irn_mode(n));
- break;
- case iro_Phi:
- {
- ir_node **in = get_Phi_preds_arr(n);
- for (i = 0; i < get_Phi_n_preds(n); i++)
- set_Phi_pred(n, i, get_new_node(get_Phi_pred(n, i)));
- res = new_r_Phi (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_Phi_n_preds(n), in, get_irn_mode(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. */
+ copy_node_attr(n, nn);
+ new_backedge_info(nn);
+
+#if DEBUG_libfirm
+ 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);
+}
+
+/**
+ * Copies new predecessors of old node to new node remembered in link.
+ * Spare the Bad predecessors of Phi and Block nodes.
+ */
+void
+copy_preds (ir_node *n, void *env) {
+ ir_node *nn, *block;
+ int i, j, irn_arity;
+
+ nn = get_new_node(n);
+
+ /* printf("\n old node: "); DDMSG2(n);
+ printf(" new node: "); DDMSG2(nn);
+ printf(" arities: old: %d, new: %d\n", get_irn_arity(n), get_irn_arity(nn)); */
+
+ if (is_Block(n)) {
+ /* 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))) {
+ set_irn_n (nn, j, get_new_node(get_irn_n(n, i)));
+ /*if (is_backedge(n, i)) set_backedge(nn, j);*/
+ 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) &&
+ (get_irn_op(get_Block_cfgpred(nn, 0)) == op_Jmp)) {
+ 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);
+ }
}
- break;
- case iro_Load:
- res = new_r_Load (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Load_mem(n)),
- get_new_node(get_Load_ptr(n)));
- break;
- case iro_Store:
- res = new_r_Store (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Store_mem(n)),
- get_new_node(get_Store_ptr(n)),
- get_new_node(get_Store_value(n)));
- break;
- case iro_Alloc:
- res = new_r_Alloc (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Alloc_mem(n)),
- get_new_node(get_Alloc_size(n)),
- get_Alloc_type(n), get_Alloc_where(n));
+ } else if (get_irn_op(n) == op_Phi) {
+ /* Don't copy node if corresponding predecessor in block is Bad.
+ The Block itself should not be Bad. */
+ block = get_nodes_block(n);
+ set_irn_n (nn, -1, 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))) {
+ set_irn_n (nn, j, get_new_node(get_irn_n(n, i)));
+ /*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.
+ @@@ inlinening aborts if we identify End. Why? */
+ if (get_irn_op(nn) != op_End)
+ add_identities (current_ir_graph->value_table, nn);
+}
- break;
- case iro_Free:
- res = new_r_Free (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Free_mem(n)),
- get_new_node(get_Free_ptr(n)),
- get_new_node(get_Free_size(n)), get_Free_type(n));
- break;
- case iro_Sync:
- {
- ir_node **in = get_Sync_preds_arr(n);
- for (i = 0; i < get_Sync_n_preds(n); i++)
- set_Sync_pred(n, i, get_new_node(get_Sync_pred(n, i)));
- res = new_r_Sync (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_Sync_n_preds(n), in);
+/**
+ * Copies the graph recursively, compacts the keepalive of the end node.
+ *
+ * @param copy_node_nr If non-zero, the node number will be copied
+ */
+static void
+copy_graph (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;
+
+ oe = get_irg_end(current_ir_graph);
+ /* copy the end node by hand, allocate dynamic in array! */
+ ne = new_ir_node(get_irn_dbg_info(oe),
+ current_ir_graph,
+ 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(current_ir_graph);
+ nb = new_ir_node(get_irn_dbg_info(ob),
+ current_ir_graph,
+ NULL,
+ op_Bad,
+ mode_T,
+ 0,
+ NULL);
+ set_new_node(ob, nb);
+
+ /* copy the NoMem node */
+ om = get_irg_no_mem(current_ir_graph);
+ nm = new_ir_node(get_irn_dbg_info(om),
+ current_ir_graph,
+ NULL,
+ op_NoMem,
+ mode_M,
+ 0,
+ NULL);
+ set_new_node(om, nm);
+
+ /* copy the live nodes */
+ irg_walk(get_nodes_block(oe), 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_irn_arity(oe);
+ for (i = 0; i < irn_arity; i++) {
+ ka = get_irn_intra_n(oe, i);
+ if ((get_irn_op(ka) == op_Block) &&
+ (get_irn_visited(ka) < get_irg_visited(current_ir_graph))) {
+ /* We must keep the block alive and copy everything reachable */
+ set_irg_visited(current_ir_graph, get_irg_visited(current_ir_graph)-1);
+ irg_walk(ka, copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
+ add_End_keepalive(ne, get_new_node(ka));
}
- break;
- case iro_Proj:
- res = new_r_Proj (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Proj_pred(n)), get_irn_mode(n),
- get_Proj_proj(n));
- break;
- case iro_Tuple:
- {
- ir_node **in = get_Tuple_preds_arr(n);
- for (i = 0; i < get_Tuple_n_preds(n); i++)
- set_Tuple_pred(n, i, get_new_node(get_Tuple_pred(n, i)));
- res = new_r_Tuple (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_Tuple_n_preds(n), in);
+ }
+
+ /* Now pick the Phis. Here we will keep all! */
+ irn_arity = get_irn_arity(oe);
+ for (i = 0; i < irn_arity; i++) {
+ ka = get_irn_intra_n(oe, i);
+ if ((get_irn_op(ka) == op_Phi)) {
+ if (get_irn_visited(ka) < get_irg_visited(current_ir_graph)) {
+ /* We didn't copy the Phi yet. */
+ set_irg_visited(current_ir_graph, get_irg_visited(current_ir_graph)-1);
+ irg_walk(ka, copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
+ }
+ add_End_keepalive(ne, get_new_node(ka));
}
- break;
- case iro_Id:
- res = new_r_Id (current_ir_graph, get_new_node(get_nodes_Block(n)),
- get_new_node(get_Id_pred(n)), get_irn_mode(n));
- break;
- case iro_Bad:
- res = new_r_Bad ();
- break;
}
- /* @@@ Here we could call optimize()!! */
- set_new_node(n, res);
- printf(" "); DDMSG2(res);
+ /* 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_node *old_end;
+ /* Not all nodes remembered in current_ir_graph 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. */
+ set_irn_link(get_irg_frame (current_ir_graph), NULL);
+ set_irn_link(get_irg_globals (current_ir_graph), NULL);
+ set_irn_link(get_irg_args (current_ir_graph), NULL);
+ set_irn_link(get_irg_initial_mem(current_ir_graph), NULL);
+ set_irn_link(get_irg_no_mem (current_ir_graph), NULL);
+
+ /* we use the block walk flag for removing Bads from Blocks ins. */
+ inc_irg_block_visited(current_ir_graph);
+
+ /* copy the graph */
+ copy_graph(copy_node_nr);
+
+ /* fix the fields in current_ir_graph */
+ old_end = get_irg_end(current_ir_graph);
+ set_irg_end (current_ir_graph, get_new_node(old_end));
+ set_irg_end_except (current_ir_graph, get_irg_end(current_ir_graph));
+ set_irg_end_reg (current_ir_graph, get_irg_end(current_ir_graph));
+ free_End(old_end);
+ set_irg_end_block (current_ir_graph, get_new_node(get_irg_end_block(current_ir_graph)));
+ if (get_irn_link(get_irg_frame(current_ir_graph)) == NULL) {
+ copy_node (get_irg_frame(current_ir_graph), INT_TO_PTR(copy_node_nr));
+ copy_preds(get_irg_frame(current_ir_graph), NULL);
+ }
+ if (get_irn_link(get_irg_globals(current_ir_graph)) == NULL) {
+ copy_node (get_irg_globals(current_ir_graph), INT_TO_PTR(copy_node_nr));
+ copy_preds(get_irg_globals(current_ir_graph), NULL);
+ }
+ if (get_irn_link(get_irg_initial_mem(current_ir_graph)) == NULL) {
+ copy_node (get_irg_initial_mem(current_ir_graph), INT_TO_PTR(copy_node_nr));
+ copy_preds(get_irg_initial_mem(current_ir_graph), NULL);
+ }
+ if (get_irn_link(get_irg_args(current_ir_graph)) == NULL) {
+ copy_node (get_irg_args(current_ir_graph), INT_TO_PTR(copy_node_nr));
+ copy_preds(get_irg_args(current_ir_graph), NULL);
+ }
+ set_irg_start (current_ir_graph, get_new_node(get_irg_start(current_ir_graph)));
+
+ set_irg_start_block(current_ir_graph,
+ get_new_node(get_irg_start_block(current_ir_graph)));
+ set_irg_frame (current_ir_graph, get_new_node(get_irg_frame(current_ir_graph)));
+ set_irg_globals (current_ir_graph, get_new_node(get_irg_globals(current_ir_graph)));
+ set_irg_initial_mem(current_ir_graph, get_new_node(get_irg_initial_mem(current_ir_graph)));
+ set_irg_args (current_ir_graph, get_new_node(get_irg_args(current_ir_graph)));
+
+ if (get_irn_link(get_irg_bad(current_ir_graph)) == NULL) {
+ copy_node(get_irg_bad(current_ir_graph), INT_TO_PTR(copy_node_nr));
+ copy_preds(get_irg_bad(current_ir_graph), NULL);
+ }
+ set_irg_bad(current_ir_graph, get_new_node(get_irg_bad(current_ir_graph)));
+
+ if (get_irn_link(get_irg_no_mem(current_ir_graph)) == NULL) {
+ copy_node(get_irg_no_mem(current_ir_graph), INT_TO_PTR(copy_node_nr));
+ copy_preds(get_irg_no_mem(current_ir_graph), NULL);
+ }
+ set_irg_no_mem(current_ir_graph, get_new_node(get_irg_no_mem(current_ir_graph)));
+}
+/**
+ * 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) {
- struct obstack *graveyard_obst=NULL;
- struct obstack *rebirth_obst;
+ ir_graph *rem;
+ int rem_ipview = get_interprocedural_view();
+ struct obstack *graveyard_obst = NULL;
+ struct obstack *rebirth_obst = NULL;
- ir_node *old_node, *new_node;
- ir_graph *rem = current_ir_graph;
+ edges_init_graph(irg);
+
+ /* inform statistics that we started a dead-node elimination run */
+ hook_dead_node_elim_start(irg);
+
+ /* Remember external state of current_ir_graph. */
+ rem = current_ir_graph;
current_ir_graph = irg;
+ set_interprocedural_view(false);
+
+ /* Handle graph state */
+ assert(get_irg_phase_state(current_ir_graph) != phase_building);
+ free_callee_info(current_ir_graph);
+ free_irg_outs(current_ir_graph);
+ free_trouts();
+ /* @@@ so far we loose loops when copying */
+ free_loop_information(current_ir_graph);
- if (get_opt_dead_node_elimination()) {
+ if (get_opt_optimize() && get_opt_dead_node_elimination()) {
/* 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 = (struct obstack *) xmalloc (sizeof (struct obstack));
+ rebirth_obst = xmalloc (sizeof(*rebirth_obst));
current_ir_graph->obst = rebirth_obst;
obstack_init (current_ir_graph->obst);
- /*CS*/
- printf("Before starting the DEAD NODE ELIMINATION !\n");
-
- /* Copy nodes remembered in irg fields first.
- The optimization contains tests against these fields, e.g., not
- to optimize the start block away. Therefore these fields have to
- be fixed first.
- Further setting these fields in copy_node would impose additional
- tests for all nodes of a kind.
- Predict the visited flag the walker will use! */
- /* Copy the start Block node */
- old_node = irg->start_block;
- new_node = new_r_Block (current_ir_graph, 0, NULL); /* new_r_Block calls
- no optimization --> save */
- irg->start_block = new_node;
- set_new_node (old_node, new_node);
- set_irn_visited (new_node, get_irg_visited(current_ir_graph)+1);
- /* Copy the Start node */
- old_node = irg->start;
- new_node = new_r_Start (current_ir_graph, irg->start_block);
- irg->start = new_node;
- DDMSG2(new_node);
- set_new_node (old_node, new_node);
- set_irn_visited (new_node, get_irg_visited(current_ir_graph)+1);
- /* Copy the Bad node */
- old_node = irg->bad;
- new_node = new_ir_node (irg, irg->start_block, op_Bad, mode_T, 0, NULL);
- irg->bad = new_node;
- set_new_node (old_node, new_node);
- set_irn_visited (new_node, get_irg_visited(current_ir_graph)+1);
- /* Copy the Projs for the Start's results. */
- old_node = irg->frame;
- new_node = new_r_Proj (irg, irg->start_block, irg->start, mode_p, pns_frame_base);
- irg->frame = new_node;
- set_new_node (old_node, new_node);
- set_irn_visited (new_node, get_irg_visited(current_ir_graph)+1);
-
- old_node = irg->globals;
- new_node = new_r_Proj (irg, irg->start_block, irg->start, mode_p, pns_globals);
- irg->globals = new_node;
- set_new_node (old_node, new_node);
- set_irn_visited (new_node, get_irg_visited(current_ir_graph)+1);
-
- old_node = irg->args;
- new_node = new_r_Proj (irg, irg->start_block, irg->start, mode_T, pns_args);
- irg->args = new_node;
- set_new_node (old_node, new_node);
- set_irn_visited (new_node, get_irg_visited(current_ir_graph)+1);
-
- /* Walks the graph once, and at the recursive way do the copy thing.
- all reachable nodes will be copied to a new obstack. */
- irg_walk(irg->end, NULL, copy_node, NULL);
-
- /*CS*/
- printf("After the DEAD NODE ELIMINATION !\n");
+ /* We also need a new hash 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(1);
/* Free memory from old unoptimized obstack */
- xfree (graveyard_obst);
+ 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_stop(irg);
+
+ current_ir_graph = rem;
+ set_interprocedural_view(rem_ipview);
+}
+
+/**
+ * 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;
+
+ /* if link field of block is NULL, look for bad predecessors otherwise
+ this is already done */
+ if (get_irn_op(n) == op_Block &&
+ 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 (get_irn_op(n) == op_Block)
+ relink_bad_block_predecessors(n, env);
+
+ /* If Phi node relink its block and its predecessors */
+ if (get_irn_op(n) == op_Phi) {
+
+ /* 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((ir_node *)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_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) {
+ irg_walk_graph(irg, init_link, relink_bad_predecessors, NULL);
+}
+
+
+/*--------------------------------------------------------------------*/
+/* 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 *new;
+ type *frame_tp = (type *)env;
+
+ copy_node(n, NULL);
+ if (get_irn_op(n) == op_Sel) {
+ new = get_new_node (n);
+ assert(get_irn_op(new) == op_Sel);
+ if (get_entity_owner(get_Sel_entity(n)) == frame_tp) {
+ set_Sel_entity(new, get_entity_link(get_Sel_entity(n)));
+ }
+ } else if (get_irn_op(n) == op_Block) {
+ new = get_new_node (n);
+ new->attr.block.irg = current_ir_graph;
+ }
+}
+
+static void find_addr(ir_node *node, void *env)
+{
+ if (get_irn_opcode(node) == iro_Proj) {
+ if (get_Proj_proj(node) == pn_Start_P_value_arg_base)
+ *(int *)env = 0;
+ }
+}
+
+/*
+ * 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)
+{
+ 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 params */
+ for (i = 0; i < params; ++i) {
+ type *p_type = get_method_param_type(call_type, i);
+
+ if (is_compound_type(p_type))
+ return 0;
+ }
+
+ /* check res */
+ for (i = 0; i < ress; ++i) {
+ 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;
+}
+
+int inline_method(ir_node *call, ir_graph *called_graph) {
+ ir_node *pre_call;
+ ir_node *post_call, *post_bl;
+ ir_node *in[5];
+ 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, j, rem_opt, irn_arity;
+ int exc_handling;
+ type *called_frame;
+ irg_inline_property prop = get_irg_inline_property(called_graph);
+
+ if ( (prop != irg_inline_forced) &&
+ (!get_opt_optimize() || !get_opt_inline() || (prop == irg_inline_forbidden))) return 0;
+
+ /* Do not inline variadic functions. */
+ if (get_method_variadicity(get_entity_type(get_irg_entity(called_graph))) == variadicity_variadic)
+ return 0;
+
+ assert(get_method_n_params(get_entity_type(get_irg_entity(called_graph))) ==
+ get_method_n_params(get_Call_type(call)));
+
+ /*
+ * 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);
+ if (get_irg_outs_state(current_ir_graph) == outs_consistent)
+ set_irg_outs_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(get_irn_op(call) == op_Call);
+ /* @@@ does not work for InterfaceIII.java after cgana
+ assert(get_Call_type(call) == get_entity_type(get_irg_entity(called_graph)));
+ assert(smaller_type(get_entity_type(get_irg_entity(called_graph)),
+ get_Call_type(call)));
+ */
+ assert(get_type_tpop(get_Call_type(call)) == type_method);
+ if (called_graph == current_ir_graph) {
+ set_optimize(rem_opt);
+ return 0;
+ }
+
+ /* 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 = (ir_node *)get_irn_link(call); proj; proj = (ir_node *)get_irn_link(proj)) {
+ assert(get_irn_op(proj) == op_Proj);
+ if (get_Proj_proj(proj) == pn_Call_X_except) Xproj = proj;
+ if (get_Proj_proj(proj) == pn_Call_M_except) Mproj = proj;
+ }
+ if (Mproj) { assert(Xproj); exc_handling = 0; } /* Mproj */
+ else if (Xproj) { exc_handling = 1; } /* !Mproj && Xproj */
+ else { exc_handling = 2; } /* !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);
+ /* XxMxPxP 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_T_args] = new_Tuple(get_Call_n_params(call), get_Call_param_arr(call));
+ /* in[pn_Start_P_value_arg_base] = ??? */
+ pre_call = new_Tuple(5, 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);
+ for (i = 0; i < get_class_n_members(called_frame); i++) {
+ entity *new_ent, *old_ent;
+ old_ent = get_class_member(called_frame, i);
+ new_ent = copy_entity_own(old_ent, get_cur_frame_type());
+ 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. */
+ /* @@@ endless loops are not copied!! -- they should be, I think... */
+ 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++)
+ add_End_keepalive(get_irg_end(current_ir_graph), get_irn_n(end, i));
+
+ /* 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 (get_irn_op(ret) == op_Return) {
+ 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, 4);
+ /* First the Memory-Phi */
+ n_ret = 0;
+ for (i = 0; i < arity; i++) {
+ ret = get_irn_n(end_bl, i);
+ if (get_irn_op(ret) == op_Return) {
+ 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 (get_irn_op(ret) == op_Return) {
+ 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_irn_link(phi, get_irn_link(post_bl));
+ set_irn_link(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());
+ }
+ /* 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 == 0) {
+ n_exc = 0;
+ for (i = 0; i < arity; i++) {
+ ir_node *ret;
+ ret = get_irn_n(end_bl, i);
+ if (is_fragile_op(skip_Proj(ret)) || (get_irn_op(skip_Proj(ret)) == op_Raise)) {
+ 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 (get_irn_op(ret) == op_Call) {
+ 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 (get_irn_op(ret) == op_Raise) {
+ 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);
+
+ if (is_fragile_op(skip_Proj(ret)) || (get_irn_op(skip_Proj(ret)) == op_Raise)) {
+ 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);
+
+#if 0 /* old. now better, correcter, faster implementation. */
+ if (n_exc > 0) {
+ /* -- If the exception control flow from the inlined Call directly
+ branched to the end block we now have the following control
+ flow predecessor pattern: ProjX -> Tuple -> Jmp. We must
+ remove the Jmp along with it's empty block and add Jmp's
+ predecessors as predecessors of this end block. No problem if
+ there is no exception, because then branches Bad to End which
+ is fine. --
+ @@@ can't we know this beforehand: by getting the Proj(1) from
+ the Call link list and checking whether it goes to Proj. */
+ /* find the problematic predecessor of the end block. */
+ end_bl = get_irg_end_block(current_ir_graph);
+ for (i = 0; i < get_Block_n_cfgpreds(end_bl); i++) {
+ cf_op = get_Block_cfgpred(end_bl, i);
+ if (get_irn_op(cf_op) == op_Proj) {
+ cf_op = get_Proj_pred(cf_op);
+ if ((get_irn_op(cf_op) == op_Tuple) && (cf_op == call)) {
+ /* There are unoptimized tuples from inlineing before when no exc */
+ assert(get_Proj_proj(get_Block_cfgpred(end_bl, i)) == pn_Call_X_except);
+ cf_op = get_Tuple_pred(cf_op, pn_Call_X_except);
+ assert(get_irn_op(cf_op) == op_Jmp);
+ break;
+ }
+ }
+ }
+ /* repair */
+ if (i < get_Block_n_cfgpreds(end_bl)) {
+ bl = get_nodes_block(cf_op);
+ arity = get_Block_n_cfgpreds(end_bl) + get_Block_n_cfgpreds(bl) - 1;
+ cf_pred = xmalloc (arity * sizeof(*cf_pred));
+ for (j = 0; j < i; j++)
+ cf_pred[j] = get_Block_cfgpred(end_bl, j);
+ for (j = j; j < i + get_Block_n_cfgpreds(bl); j++)
+ cf_pred[j] = get_Block_cfgpred(bl, j-i);
+ for (j = j; j < arity; j++)
+ cf_pred[j] = get_Block_cfgpred(end_bl, j-get_Block_n_cfgpreds(bl) +1);
+ set_irn_in(end_bl, arity, cf_pred);
+ free(cf_pred);
+ /* Remove the exception pred from post-call Tuple. */
+ set_Tuple_pred(call, pn_Call_X_except, new_Bad());
+ }
+ }
+#endif
+
+ /* -- Turn CSE back on. -- */
+ set_optimize(rem_opt);
+
+ return 1;
+}
+
+/********************************************************************/
+/* Apply inlineing to small methods. */
+/********************************************************************/
+
+/* It makes no sense to inline too many calls in one procedure. Anyways,
+ I didn't get a version with NEW_ARR_F to run. */
+#define MAX_INLINE 1024
+
+/**
+ * environment for inlining small irgs
+ */
+typedef struct _inline_env_t {
+ int pos;
+ ir_node *calls[MAX_INLINE];
+} inline_env_t;
+
+/**
+ * Returns the irg called from a Call node. If the irg is not
+ * known, NULL is returned.
+ */
+static ir_graph *get_call_called_irg(ir_node *call) {
+ ir_node *addr;
+ ir_graph *called_irg = NULL;
+
+ assert(get_irn_op(call) == op_Call);
+
+ addr = get_Call_ptr(call);
+ if ((get_irn_op(addr) == op_SymConst) && (get_SymConst_kind (addr) == symconst_addr_ent)) {
+ called_irg = get_entity_irg(get_SymConst_entity(addr));
+ }
+
+ return called_irg;
+}
+
+static void collect_calls(ir_node *call, void *env) {
+ ir_node *addr;
+
+ if (get_irn_op(call) != op_Call) return;
+
+ addr = get_Call_ptr(call);
+
+ if (get_irn_op(addr) == op_SymConst) {
+ if (get_SymConst_kind(addr) == symconst_addr_ent) {
+ ir_graph *called_irg = get_entity_irg(get_SymConst_entity(addr));
+ inline_env_t *ienv = (inline_env_t *)env;
+ if (called_irg && ienv->pos < MAX_INLINE) {
+ /* The Call node calls a locally defined method. Remember to inline. */
+ ienv->calls[ienv->pos++] = call;
+ }
+ }
+ }
+}
+
+/**
+ * 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) {
+ int i;
+ ir_graph *rem = current_ir_graph;
+ inline_env_t env /* = {0, NULL}*/;
+
+ if (!(get_opt_optimize() && get_opt_inline())) return;
+
+ current_ir_graph = irg;
+ /* Handle graph state */
+ assert(get_irg_phase_state(current_ir_graph) != phase_building);
+ free_callee_info(current_ir_graph);
+
+ /* 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.) */
+ env.pos = 0;
+ irg_walk(get_irg_end(irg), NULL, collect_calls, &env);
+
+ if ((env.pos > 0) && (env.pos < MAX_INLINE)) {
+ /* There are calls to inline */
+ collect_phiprojs(irg);
+ for (i = 0; i < env.pos; i++) {
+ ir_graph *callee;
+ callee = get_entity_irg(get_SymConst_entity(get_Call_ptr(env.calls[i])));
+ if (((_obstack_memory_used(callee->obst) - (int)obstack_room(callee->obst)) < size) ||
+ (get_irg_inline_property(callee) == irg_inline_forced)) {
+ inline_method(env.calls[i], callee);
+ }
+ }
}
current_ir_graph = rem;
}
+
+/**
+ * Environment for inlining irgs.
+ */
+typedef struct {
+ int n_nodes; /**< Nodes in graph except Id, Tuple, Proj, Start, End */
+ int n_nodes_orig; /**< for statistics */
+ eset *call_nodes; /**< All call nodes in this graph */
+ int n_call_nodes;
+ int n_call_nodes_orig; /**< for statistics */
+ int n_callers; /**< Number of known graphs that call this graphs. */
+ int n_callers_orig; /**< for statistics */
+} inline_irg_env;
+
+/**
+ * Allocate a new environment for inlining.
+ */
+static inline_irg_env *new_inline_irg_env(void) {
+ inline_irg_env *env = xmalloc(sizeof(*env));
+ env->n_nodes = -2; /* do not count count Start, End */
+ env->n_nodes_orig = -2; /* do not count Start, End */
+ env->call_nodes = eset_create();
+ env->n_call_nodes = 0;
+ env->n_call_nodes_orig = 0;
+ env->n_callers = 0;
+ env->n_callers_orig = 0;
+ return env;
+}
+
+/**
+ * destroy an environment for inlining.
+ */
+static void free_inline_irg_env(inline_irg_env *env) {
+ eset_destroy(env->call_nodes);
+ free(env);
+}
+
+/**
+ * post-walker: collect all calls in the inline-environment
+ * of a graph and sum some statistics.
+ */
+static void collect_calls2(ir_node *call, void *env) {
+ inline_irg_env *x = (inline_irg_env *)env;
+ ir_op *op = get_irn_op(call);
+ ir_graph *callee;
+
+ /* count meaningful nodes in irg */
+ if (op != op_Proj && op != op_Tuple && op != op_Sync) {
+ x->n_nodes++;
+ x->n_nodes_orig++;
+ }
+
+ if (op != op_Call) return;
+
+ /* collect all call nodes */
+ eset_insert(x->call_nodes, call);
+ x->n_call_nodes++;
+ x->n_call_nodes_orig++;
+
+ /* count all static callers */
+ callee = get_call_called_irg(call);
+ if (callee) {
+ inline_irg_env *callee_env = get_irg_link(callee);
+ callee_env->n_callers++;
+ callee_env->n_callers_orig++;
+ }
+}
+
+/**
+ * Returns TRUE if the number of callers in 0 in the irg's environment,
+ * hence this irg is a leave.
+ */
+INLINE static int is_leave(ir_graph *irg) {
+ return (((inline_irg_env *)get_irg_link(irg))->n_call_nodes == 0);
+}
+
+/**
+ * Returns TRUE if the number of callers is smaller size in the irg's environment.
+ */
+INLINE static int is_smaller(ir_graph *callee, int size) {
+ return (((inline_irg_env *)get_irg_link(callee))->n_nodes < size);
+}
+
+
+/*
+ * 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) {
+ inline_irg_env *env;
+ int i, n_irgs = get_irp_n_irgs();
+ ir_graph *rem = current_ir_graph;
+ int did_inline = 1;
+
+ if (!(get_opt_optimize() && get_opt_inline())) return;
+
+ /* extend all irgs by a temporary data structure for inlining. */
+ for (i = 0; i < n_irgs; ++i)
+ set_irg_link(get_irp_irg(i), new_inline_irg_env());
+
+ /* Precompute information in temporary data structure. */
+ for (i = 0; i < n_irgs; ++i) {
+ current_ir_graph = get_irp_irg(i);
+ assert(get_irg_phase_state(current_ir_graph) != phase_building);
+ free_callee_info(current_ir_graph);
+
+ irg_walk(get_irg_end(current_ir_graph), NULL, collect_calls2,
+ get_irg_link(current_ir_graph));
+ }
+
+ /* -- and now inline. -- */
+
+ /* Inline leaves recursively -- we might construct new leaves. */
+ while (did_inline) {
+ 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);
+
+ for (call = eset_first(env->call_nodes); call; call = eset_next(env->call_nodes)) {
+ ir_graph *callee;
+
+ if (get_irn_op(call) == op_Tuple) continue; /* We already have inlined this call. */
+ callee = get_call_called_irg(call);
+
+ if (env->n_nodes > maxsize) continue; // break;
+
+ if (callee && (is_leave(callee) && is_smaller(callee, leavesize))) {
+ if (!phiproj_computed) {
+ phiproj_computed = 1;
+ collect_phiprojs(current_ir_graph);
+ }
+ did_inline = inline_method(call, callee);
+
+ if (did_inline) {
+ /* Do some statistics */
+ inline_irg_env *callee_env = (inline_irg_env *)get_irg_link(callee);
+ env->n_call_nodes --;
+ env->n_nodes += callee_env->n_nodes;
+ callee_env->n_callers--;
+ }
+ }
+ }
+ }
+ }
+
+ /* inline other small functions. */
+ for (i = 0; i < n_irgs; ++i) {
+ ir_node *call;
+ eset *walkset;
+ int phiproj_computed = 0;
+
+ current_ir_graph = get_irp_irg(i);
+ env = (inline_irg_env *)get_irg_link(current_ir_graph);
+
+ /* we can not walk and change a set, nor remove from it.
+ So recompute.*/
+ walkset = env->call_nodes;
+ env->call_nodes = eset_create();
+ for (call = eset_first(walkset); call; call = eset_next(walkset)) {
+ ir_graph *callee;
+
+ if (get_irn_op(call) == op_Tuple) continue; /* We already inlined. */
+ callee = get_call_called_irg(call);
+
+ if (callee &&
+ ((is_smaller(callee, size) && (env->n_nodes < maxsize)) || /* small function */
+ (get_irg_inline_property(callee) == irg_inline_forced))) {
+ if (!phiproj_computed) {
+ phiproj_computed = 1;
+ collect_phiprojs(current_ir_graph);
+ }
+ if (inline_method(call, callee)) {
+ inline_irg_env *callee_env = (inline_irg_env *)get_irg_link(callee);
+ env->n_call_nodes--;
+ eset_insert_all(env->call_nodes, callee_env->call_nodes); /* @@@ ??? This are the wrong nodes !? Not the copied ones. */
+ env->n_call_nodes += callee_env->n_call_nodes;
+ env->n_nodes += callee_env->n_nodes;
+ callee_env->n_callers--;
+ }
+ } else {
+ eset_insert(env->call_nodes, call);
+ }
+ }
+ eset_destroy(walkset);
+ }
+
+ for (i = 0; i < n_irgs; ++i) {
+ current_ir_graph = get_irp_irg(i);
+#if 0
+ env = (inline_irg_env *)get_irg_link(current_ir_graph);
+ if ((env->n_call_nodes_orig != env->n_call_nodes) ||
+ (env->n_callers_orig != env->n_callers))
+ printf("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(current_ir_graph)));
+#endif
+ free_inline_irg_env((inline_irg_env *)get_irg_link(current_ir_graph));
+ }
+
+ current_ir_graph = rem;
+}
+
+/*******************************************************************/
+/* Code Placement. Pins all floating nodes to a block where they */
+/* will be executed only if needed. */
+/*******************************************************************/
+
+/**
+ * Returns non-zero, is a block is not reachable from Start.
+ *
+ * @param block the block to test
+ */
+static int
+is_Block_unreachable(ir_node *block) {
+ return is_Block_dead(block) || get_Block_dom_depth(block) < 0;
+}
+
+/**
+ * Find the earliest correct block for N. --- Place N into the
+ * same Block as its dominance-deepest Input.
+ *
+ * We have to avoid calls to get_nodes_block() here
+ * because the graph is floating.
+ *
+ * move_out_of_loops() expects that place_floats_early() have placed
+ * all "living" nodes into a living block. That's why we must
+ * move nodes in dead block with "live" successors into a valid
+ * block.
+ * We move them just into the same block as it's successor (or
+ * in case of a Phi into the effective use block). For Phi successors,
+ * this may still be a dead block, but then there is no real use, as
+ * the control flow will be dead later.
+ */
+static void
+place_floats_early(ir_node *n, pdeq *worklist)
+{
+ int i, irn_arity;
+
+ /* we must not run into an infinite loop */
+ assert(irn_not_visited(n));
+ mark_irn_visited(n);
+
+ /* Place floating nodes. */
+ if (get_irn_pinned(n) == op_pin_state_floats) {
+ ir_node *curr_block = get_irn_n(n, -1);
+ int in_dead_block = is_Block_unreachable(curr_block);
+ int depth = 0;
+ ir_node *b = NULL; /* The block to place this node in */
+
+ assert(get_irn_op(n) != op_Block);
+
+ if ((get_irn_op(n) == op_Const) ||
+ (get_irn_op(n) == op_SymConst) ||
+ (is_Bad(n)) ||
+ (get_irn_op(n) == op_Unknown)) {
+ /* These nodes will not be placed by the loop below. */
+ b = get_irg_start_block(current_ir_graph);
+ depth = 1;
+ }
+
+ /* find the block for this node. */
+ irn_arity = get_irn_arity(n);
+ for (i = 0; i < irn_arity; i++) {
+ ir_node *pred = get_irn_n(n, i);
+ ir_node *pred_block;
+
+ if ((irn_not_visited(pred))
+ && (get_irn_pinned(pred) == op_pin_state_floats)) {
+
+ /*
+ * If the current node is NOT in a dead block, but one of its
+ * predecessors is, we must move the predecessor to a live block.
+ * Such thing can happen, if global CSE chose a node from a dead block.
+ * We move it simple to our block.
+ * Note that neither Phi nor End nodes are floating, so we don't
+ * need to handle them here.
+ */
+ if (! in_dead_block) {
+ if (get_irn_pinned(pred) == op_pin_state_floats &&
+ is_Block_unreachable(get_irn_n(pred, -1)))
+ set_nodes_block(pred, curr_block);
+ }
+ place_floats_early(pred, worklist);
+ }
+
+ /*
+ * A node in the Bad block must stay in the bad block,
+ * so don't compute a new block for it.
+ */
+ if (in_dead_block)
+ continue;
+
+ /* Because all loops contain at least one op_pin_state_pinned node, now all
+ our inputs are either op_pin_state_pinned or place_early() has already
+ been finished on them. We do not have any unfinished inputs! */
+ pred_block = get_irn_n(pred, -1);
+ if ((!is_Block_dead(pred_block)) &&
+ (get_Block_dom_depth(pred_block) > depth)) {
+ b = pred_block;
+ depth = get_Block_dom_depth(pred_block);
+ }
+ /* Avoid that the node is placed in the Start block */
+ if ((depth == 1) && (get_Block_dom_depth(get_irn_n(n, -1)) > 1)) {
+ b = get_Block_cfg_out(get_irg_start_block(current_ir_graph), 0);
+ assert(b != get_irg_start_block(current_ir_graph));
+ depth = 2;
+ }
+ }
+ if (b)
+ set_nodes_block(n, b);
+ }
+
+ /*
+ * Add predecessors of non floating nodes and non-floating predecessors
+ * of floating nodes to worklist and fix their blocks if the are in dead block.
+ */
+ irn_arity = get_irn_arity(n);
+
+ if (get_irn_op(n) == op_End) {
+ /*
+ * Simplest case: End node. Predecessors are keep-alives,
+ * no need to move out of dead block.
+ */
+ for (i = -1; i < irn_arity; ++i) {
+ ir_node *pred = get_irn_n(n, i);
+ if (irn_not_visited(pred))
+ pdeq_putr(worklist, pred);
+ }
+ }
+ else if (is_Block(n)) {
+ /*
+ * Blocks: Predecessors are control flow, no need to move
+ * them out of dead block.
+ */
+ for (i = irn_arity - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_n(n, i);
+ if (irn_not_visited(pred))
+ pdeq_putr(worklist, pred);
+ }
+ }
+ else if (is_Phi(n)) {
+ ir_node *pred;
+ ir_node *curr_block = get_irn_n(n, -1);
+ int in_dead_block = is_Block_unreachable(curr_block);
+
+ /*
+ * Phi nodes: move nodes from dead blocks into the effective use
+ * of the Phi-input if the Phi is not in a bad block.
+ */
+ pred = get_irn_n(n, -1);
+ if (irn_not_visited(pred))
+ pdeq_putr(worklist, pred);
+
+ for (i = irn_arity - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_n(n, i);
+
+ if (irn_not_visited(pred)) {
+ if (! in_dead_block &&
+ get_irn_pinned(pred) == op_pin_state_floats &&
+ is_Block_unreachable(get_irn_n(pred, -1))) {
+ set_nodes_block(pred, get_Block_cfgpred_block(curr_block, i));
+ }
+ pdeq_putr(worklist, pred);
+ }
+ }
+ }
+ else {
+ ir_node *pred;
+ ir_node *curr_block = get_irn_n(n, -1);
+ int in_dead_block = is_Block_unreachable(curr_block);
+
+ /*
+ * All other nodes: move nodes from dead blocks into the same block.
+ */
+ pred = get_irn_n(n, -1);
+ if (irn_not_visited(pred))
+ pdeq_putr(worklist, pred);
+
+ for (i = irn_arity - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_n(n, i);
+
+ if (irn_not_visited(pred)) {
+ if (! in_dead_block &&
+ get_irn_pinned(pred) == op_pin_state_floats &&
+ is_Block_unreachable(get_irn_n(pred, -1))) {
+ set_nodes_block(pred, curr_block);
+ }
+ pdeq_putr(worklist, pred);
+ }
+ }
+ }
+}
+
+/**
+ * Floating nodes form subgraphs that begin at nodes as Const, Load,
+ * Start, Call and that end at op_pin_state_pinned nodes as Store, Call. Place_early
+ * places all floating nodes reachable from its argument through floating
+ * nodes and adds all beginnings at op_pin_state_pinned nodes to the worklist.
+ */
+static INLINE void place_early(pdeq *worklist) {
+ assert(worklist);
+ inc_irg_visited(current_ir_graph);
+
+ /* this inits the worklist */
+ place_floats_early(get_irg_end(current_ir_graph), worklist);
+
+ /* Work the content of the worklist. */
+ while (!pdeq_empty(worklist)) {
+ ir_node *n = pdeq_getl(worklist);
+ if (irn_not_visited(n))
+ place_floats_early(n, worklist);
+ }
+
+ set_irg_outs_inconsistent(current_ir_graph);
+ current_ir_graph->op_pin_state_pinned = op_pin_state_pinned;
+}
+
+/**
+ * Compute the deepest common ancestor of block and dca.
+ */
+static ir_node *calc_dca(ir_node *dca, ir_node *block)
+{
+ assert(block);
+
+ /* we do not want to place nodes in dead blocks */
+ if (is_Block_dead(block))
+ return dca;
+
+ /* We found a first legal placement. */
+ if (!dca) return block;
+
+ /* Find a placement that is dominates both, dca and block. */
+ while (get_Block_dom_depth(block) > get_Block_dom_depth(dca))
+ block = get_Block_idom(block);
+
+ while (get_Block_dom_depth(dca) > get_Block_dom_depth(block)) {
+ dca = get_Block_idom(dca);
+ }
+
+ while (block != dca)
+ { block = get_Block_idom(block); dca = get_Block_idom(dca); }
+
+ return dca;
+}
+
+/** Deepest common dominance ancestor of DCA and CONSUMER of PRODUCER.
+ * I.e., DCA is the block where we might place PRODUCER.
+ * A data flow edge points from producer to consumer.
+ */
+static ir_node *
+consumer_dom_dca(ir_node *dca, ir_node *consumer, ir_node *producer)
+{
+ ir_node *block = NULL;
+
+ /* Compute the latest block into which we can place a node so that it is
+ before consumer. */
+ if (get_irn_op(consumer) == op_Phi) {
+ /* our consumer is a Phi-node, the effective use is in all those
+ blocks through which the Phi-node reaches producer */
+ int i, irn_arity;
+ ir_node *phi_block = get_nodes_block(consumer);
+ irn_arity = get_irn_arity(consumer);
+
+ for (i = 0; i < irn_arity; i++) {
+ if (get_irn_n(consumer, i) == producer) {
+ ir_node *new_block = get_nodes_block(get_Block_cfgpred(phi_block, i));
+
+ if (! is_Block_unreachable(new_block))
+ block = calc_dca(block, new_block);
+ }
+ }
+
+ if (! block)
+ block = get_irn_n(producer, -1);
+ }
+ else {
+ assert(is_no_Block(consumer));
+ block = get_nodes_block(consumer);
+ }
+
+ /* Compute the deepest common ancestor of block and dca. */
+ return calc_dca(dca, block);
+}
+
+/* FIXME: the name clashes here with the function from ana/field_temperature.c
+ * please rename. */
+static INLINE int get_irn_loop_depth(ir_node *n) {
+ return get_loop_depth(get_irn_loop(n));
+}
+
+/**
+ * Move n to a block with less loop depth than it's current block. The
+ * new block must be dominated by early.
+ *
+ * @param n the node that should be moved
+ * @param early the earliest block we can n move to
+ */
+static void
+move_out_of_loops (ir_node *n, ir_node *early)
+{
+ ir_node *best, *dca;
+ assert(n && early);
+
+
+ /* Find the region deepest in the dominator tree dominating
+ dca with the least loop nesting depth, but still dominated
+ by our early placement. */
+ dca = get_nodes_block(n);
+
+ best = dca;
+ while (dca != early) {
+ dca = get_Block_idom(dca);
+ if (!dca || is_Bad(dca)) break; /* may be Bad if not reachable from Start */
+ if (get_irn_loop_depth(dca) < get_irn_loop_depth(best)) {
+ best = dca;
+ }
+ }
+ if (best != get_nodes_block(n)) {
+ /* debug output
+ printf("Moving out of loop: "); DDMN(n);
+ printf(" Outermost block: "); DDMN(early);
+ printf(" Best block: "); DDMN(best);
+ printf(" Innermost block: "); DDMN(get_nodes_block(n));
+ */
+ set_nodes_block(n, best);
+ }
+}
+
+/**
+ * Find the latest legal block for N and place N into the
+ * `optimal' Block between the latest and earliest legal block.
+ * The `optimal' block is the dominance-deepest block of those
+ * with the least loop-nesting-depth. This places N out of as many
+ * loops as possible and then makes it as control dependent as
+ * possible.
+ */
+static void
+place_floats_late(ir_node *n, pdeq *worklist)
+{
+ int i;
+ ir_node *early_blk;
+
+ assert(irn_not_visited(n)); /* no multiple placement */
+
+ mark_irn_visited(n);
+
+ /* no need to place block nodes, control nodes are already placed. */
+ if ((get_irn_op(n) != op_Block) &&
+ (!is_cfop(n)) &&
+ (get_irn_mode(n) != mode_X)) {
+ /* Remember the early_blk placement of this block to move it
+ out of loop no further than the early_blk placement. */
+ early_blk = get_irn_n(n, -1);
+
+ /*
+ * BEWARE: Here we also get code, that is live, but
+ * was in a dead block. If the node is life, but because
+ * of CSE in a dead block, we still might need it.
+ */
+
+ /* Assure that our users are all placed, except the Phi-nodes.
+ --- Each data flow cycle contains at least one Phi-node. We
+ have to break the `user has to be placed before the
+ producer' dependence cycle and the Phi-nodes are the
+ place to do so, because we need to base our placement on the
+ final region of our users, which is OK with Phi-nodes, as they
+ are op_pin_state_pinned, and they never have to be placed after a
+ producer of one of their inputs in the same block anyway. */
+ for (i = get_irn_n_outs(n) - 1; i >= 0; --i) {
+ ir_node *succ = get_irn_out(n, i);
+ if (irn_not_visited(succ) && (get_irn_op(succ) != op_Phi))
+ place_floats_late(succ, worklist);
+ }
+
+ if (! is_Block_dead(early_blk)) {
+ /* do only move things that where not dead */
+
+ /* We have to determine the final block of this node... except for
+ constants. */
+ if ((get_irn_pinned(n) == op_pin_state_floats) &&
+ (get_irn_op(n) != op_Const) &&
+ (get_irn_op(n) != op_SymConst)) {
+ ir_node *dca = NULL; /* deepest common ancestor in the
+ dominator tree of all nodes'
+ blocks depending on us; our final
+ placement has to dominate DCA. */
+ for (i = get_irn_n_outs(n) - 1; i >= 0; --i) {
+ ir_node *succ = get_irn_out(n, i);
+ ir_node *succ_blk;
+
+ if (get_irn_op(succ) == op_End) {
+ /*
+ * This consumer is the End node, a keep alive edge.
+ * This is not a real consumer, so we ignore it
+ */
+ continue;
+ }
+
+ /* ignore if succ is in dead code */
+ succ_blk = get_irn_n(succ, -1);
+ if (is_Block_unreachable(succ_blk))
+ continue;
+ dca = consumer_dom_dca(dca, succ, n);
+ }
+ if (dca) {
+ set_nodes_block(n, dca);
+ move_out_of_loops(n, early_blk);
+ }
+ }
+ }
+ }
+
+ /* Add predecessors of all non-floating nodes on list. (Those of floating
+ nodes are placed already and therefore are marked.) */
+ for (i = 0; i < get_irn_n_outs(n); i++) {
+ ir_node *succ = get_irn_out(n, i);
+ if (irn_not_visited(get_irn_out(n, i))) {
+ pdeq_putr(worklist, succ);
+ }
+ }
+}
+
+static INLINE void place_late(pdeq *worklist) {
+ assert(worklist);
+ inc_irg_visited(current_ir_graph);
+
+ /* This fills the worklist initially. */
+ place_floats_late(get_irg_start_block(current_ir_graph), worklist);
+
+ /* And now empty the worklist again... */
+ while (!pdeq_empty(worklist)) {
+ ir_node *n = pdeq_getl(worklist);
+ if (irn_not_visited(n))
+ place_floats_late(n, worklist);
+ }
+}
+
+void place_code(ir_graph *irg) {
+ pdeq *worklist;
+ ir_graph *rem = current_ir_graph;
+
+ current_ir_graph = irg;
+
+ if (!(get_opt_optimize() && get_opt_global_cse())) return;
+
+ /* Handle graph state */
+ assert(get_irg_phase_state(irg) != phase_building);
+ if (get_irg_dom_state(irg) != dom_consistent)
+ compute_doms(irg);
+
+ if (1 || get_irg_loopinfo_state(irg) != loopinfo_consistent) {
+ free_loop_information(irg);
+ construct_backedges(irg);
+ }
+
+ /* Place all floating nodes as early as possible. This guarantees
+ a legal code placement. */
+ worklist = new_pdeq();
+ place_early(worklist);
+
+ /* place_early() invalidates the outs, place_late needs them. */
+ compute_irg_outs(irg);
+
+ /* Now move the nodes down in the dominator tree. This reduces the
+ unnecessary executions of the node. */
+ place_late(worklist);
+
+ set_irg_outs_inconsistent(current_ir_graph);
+ set_irg_loopinfo_inconsistent(current_ir_graph);
+ del_pdeq(worklist);
+ current_ir_graph = rem;
+}
+
+/**
+ * Called by walker of remove_critical_cf_edges().
+ *
+ * Place an empty block to an edge between a blocks of multiple
+ * predecessors and a block of multiple successors.
+ *
+ * @param n IR node
+ * @param env Environment of walker. This field is unused and has
+ * the value NULL.
+ */
+static void walk_critical_cf_edges(ir_node *n, void *env) {
+ int arity, i;
+ ir_node *pre, *block, **in, *jmp;
+
+ /* Block has multiple predecessors */
+ if ((op_Block == get_irn_op(n)) &&
+ (get_irn_arity(n) > 1)) {
+ arity = get_irn_arity(n);
+
+ if (n == get_irg_end_block(current_ir_graph))
+ return; /* No use to add a block here. */
+
+ for (i=0; i<arity; i++) {
+ pre = get_irn_n(n, i);
+ /* Predecessor has multiple successors. Insert new flow edge */
+ if ((NULL != pre) &&
+ (op_Proj == get_irn_op(pre)) &&
+ op_Raise != get_irn_op(skip_Proj(pre))) {
+
+ /* set predecessor array for new block */
+ in = NEW_ARR_D (ir_node *, current_ir_graph->obst, 1);
+ /* set predecessor of new block */
+ in[0] = pre;
+ block = new_Block(1, in);
+ /* insert new jmp node to new block */
+ set_cur_block(block);
+ jmp = new_Jmp();
+ set_cur_block(n);
+ /* set successor of new block */
+ set_irn_n(n, i, jmp);
+
+ } /* predecessor has multiple successors */
+ } /* for all predecessors */
+ } /* n is a block */
+}
+
+void remove_critical_cf_edges(ir_graph *irg) {
+ if (get_opt_critical_edges())
+ irg_walk_graph(irg, NULL, walk_critical_cf_edges, NULL);
+}