#ifdef HAVE_CONFIG_H
-# include <config.h>
+# include "config.h"
#endif
#include <assert.h>
-#include <stdbool.h>
#include "irnode_t.h"
#include "irgraph_t.h"
#include "pset.h"
#include "eset.h"
#include "pdeq.h" /* Fuer code placement */
+#include "xmalloc.h"
#include "irouts.h"
#include "irloop_t.h"
}
#if 0 /* Old version. Avoids Ids.
- This is not necessary: we do a postwalk, and get_irn_n
- removes ids anyways. So it's much cheaper to call the
- optimization less often and use the exchange() algorithm. */
+ This is not necessary: we do a postwalk, 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, irn_arity;
* 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
*/
static void
copy_node (ir_node *n, void *env) {
ir_node *nn, *block;
int new_arity;
opcode op = get_irn_opcode(n);
+ int copy_node_nr = env != NULL;
+
/* 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. */
/* 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_attrs(n, nn);
+ copy_node_attr(n, nn);
new_backedge_info(nn);
set_new_node(n, 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
+
/* printf("\n old node: "); DDMSG2(n);
printf(" new node: "); DDMSG2(nn); */
-
}
/**
irn_arity = get_irn_arity(n);
for (i = 0; i < irn_arity; i++)
if (get_irn_opcode(get_irn_n(n, i)) != iro_Bad) {
- set_irn_n (nn, j, get_new_node(get_irn_n(n, i)));
- /*if (is_backedge(n, i)) set_backedge(nn, j);*/
- j++;
+ 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. */
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)) {
+ (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)));
+ /* 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);
+ exchange(nn, old);
}
}
} else if (get_irn_opcode(n) == iro_Phi) {
irn_arity = get_irn_arity(n);
for (i = 0; i < irn_arity; i++)
if (get_irn_opcode(get_irn_n(block, i)) != iro_Bad) {
- set_irn_n (nn, j, get_new_node(get_irn_n(n, i)));
- /*if (is_backedge(n, i)) set_backedge(nn, j);*/
- j++;
+ 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. */
/**
* 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 (void) {
- ir_node *oe, *ne, *ob, *nb; /* old end, new end, old bad, new bad */
+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;
-1,
NULL);
/* Copy the attributes. Well, there might be some in the future... */
- copy_attrs(oe, ne);
+ 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);
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, NULL);
+ irg_walk(get_nodes_block(oe), copy_node, copy_preds, (void *)copy_node_nr);
/* copy_preds for the end node ... */
set_nodes_block(ne, get_new_node(get_nodes_block(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))) {
+ (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, NULL);
+ irg_walk(ka, copy_node, copy_preds, (void *)copy_node_nr);
add_End_keepalive(ne, get_new_node(ka));
}
}
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, NULL);
+ /* 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, (void *)copy_node_nr);
}
add_End_keepalive(ne, get_new_node(ka));
}
}
- /* start block somtimes only reached after keep alives */
+ /* 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)));
}
/**
* 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 (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
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_graph(copy_node_nr);
/* fix the fields in current_ir_graph */
old_end = 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), NULL);
+ copy_node (get_irg_frame(current_ir_graph), (void *)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), NULL);
+ copy_node (get_irg_globals(current_ir_graph), (void *)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), NULL);
+ copy_node (get_irg_initial_mem(current_ir_graph), (void *)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), NULL);
+ copy_node (get_irg_args(current_ir_graph), (void *)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_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), NULL);
+ copy_node(get_irg_bad(current_ir_graph), (void *)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), (void *)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)));
}
/**
void
dead_node_elimination(ir_graph *irg) {
ir_graph *rem;
- int rem_ipview = interprocedural_view;
+ int rem_ipview = get_interprocedural_view();
struct obstack *graveyard_obst = NULL;
struct obstack *rebirth_obst = NULL;
/* Remember external state of current_ir_graph. */
rem = current_ir_graph;
current_ir_graph = irg;
- interprocedural_view = 0;
+ set_interprocedural_view(false);
/* Handle graph state */
assert(get_irg_phase_state(current_ir_graph) != phase_building);
irg->value_table = new_identities ();
/* Copy the graph from the old to the new obstack */
- copy_graph_env();
+ copy_graph_env(1);
/* Free memory from old unoptimized obstack */
obstack_free(graveyard_obst, 0); /* First empty the obstack ... */
stat_dead_node_elim_stop(irg);
current_ir_graph = rem;
- interprocedural_view = rem_ipview;
+ set_interprocedural_view(rem_ipview);
}
/**
/* arity changing: set new predecessors without bad nodes */
if (new_irn_arity < old_irn_arity) {
- /* get new predecessor array without Block predecessor */
+ /* 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 predeseccors in array */
new_in[0] = NULL;
new_irn_n = 1;
- for (i = 1; i < old_irn_arity; i++) {
- irn = get_irn_n(n, i);
- if (!is_Bad(irn)) new_in[new_irn_n++] = irn;
+ 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 */
/* Relink Phi predeseccors if count of predeseccors changed */
if (old_irn_arity != ARR_LEN(get_irn_in(block))) {
/* set new predeseccors in array
- n->in[0] remains the same block */
+ 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];
+ 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 predecesors from Blocks and the corresponding
* inputs to Phi nodes as in dead_node_elimination but without
* copying the graph.
* - call with compound arguments
* - graphs that take the address of a parameter
*
- * check these condition here
+ * check these conditions here
*/
static int can_inline(ir_node *call, ir_graph *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:
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);
/* -- 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.
+ exc_handling:
+ 0 There is a handler.
1 Branches to End.
2 Exception handling not represented in Firm. -- */
{
arity = get_irn_arity(end_bl); /* arity = n_exc + n_ret */
n_res = get_method_n_ress(get_Call_type(call));
- res_pred = (ir_node **) malloc (n_res * sizeof (ir_node *));
- cf_pred = (ir_node **) malloc (arity * sizeof (ir_node *));
+ res_pred = (ir_node **) xmalloc (n_res * sizeof (ir_node *));
+ cf_pred = (ir_node **) xmalloc (arity * sizeof (ir_node *));
set_irg_current_block(current_ir_graph, post_bl); /* just to make sure */
}
}
if (n_ret > 0)
- phi = new_Phi(n_ret, cf_pred, get_irn_mode(cf_pred[0]));
+ phi = new_Phi(n_ret, cf_pred, get_irn_mode(cf_pred[0]));
else
- phi = new_Bad();
+ phi = new_Bad();
res_pred[j] = phi;
/* Conserve Phi-list for further inlinings -- but might be optimized */
if (get_nodes_block(phi) == post_bl) {
}
main_end_bl = get_irg_end_block(current_ir_graph);
main_end_bl_arity = get_irn_arity(main_end_bl);
- end_preds = (ir_node **) malloc ((n_exc + main_end_bl_arity) * sizeof (ir_node *));
+ end_preds = (ir_node **) xmalloc ((n_exc + main_end_bl_arity) * sizeof (ir_node *));
for (i = 0; i < main_end_bl_arity; ++i)
end_preds[i] = get_irn_n(main_end_bl, i);
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 = (ir_node **) malloc (arity * sizeof (ir_node *));
+ cf_pred = (ir_node **) xmalloc (arity * sizeof (ir_node *));
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++)
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;
+ /* The Call node calls a locally defined method. Remember to inline. */
+ ienv->calls[ienv->pos++] = call;
}
}
}
} inline_irg_env;
static inline_irg_env *new_inline_irg_env(void) {
- inline_irg_env *env = malloc(sizeof(inline_irg_env));
+ inline_irg_env *env = xmalloc(sizeof(inline_irg_env));
env->n_nodes = -2; /* uncount Start, End */
env->n_nodes_orig = -2; /* uncount Start, End */
env->call_nodes = eset_create();
free_callee_info(current_ir_graph);
irg_walk(get_irg_end(current_ir_graph), NULL, collect_calls2,
- get_irg_link(current_ir_graph));
+ get_irg_link(current_ir_graph));
}
/* -- and now inline. -- */
env = (inline_irg_env *)get_irg_link(current_ir_graph);
for (call = eset_first(env->call_nodes); call; call = eset_next(env->call_nodes)) {
- if (get_irn_op(call) == op_Tuple) continue; /* We already inlined. */
+ if (get_irn_op(call) == op_Tuple) continue; /* We already inlined. */
ir_graph *callee = get_call_called_irg(call);
if (env->n_nodes > maxsize) continue; // break;
phiproj_computed = 1;
collect_phiprojs(current_ir_graph);
}
- did_inline = inline_method(call, callee);
+ 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--;
- }
- }
+ /* 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--;
+ }
+ }
}
}
}
ir_graph *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))) {
+ ((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--;
- }
+ 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);
}
#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))
+ (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)));
+ 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));
}
mark_irn_visited(n);
/* Place floating nodes. */
- if (get_op_pinned(get_irn_op(n)) == op_pin_state_floats) {
+ if (get_irn_pinned(n) == op_pin_state_floats) {
int depth = 0;
ir_node *b = new_Bad(); /* The block to place this node in */
int bad_recursion = is_Bad(get_nodes_block(n));
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)) {
+ (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;
ir_node *dep_block;
if ((irn_not_visited(dep))
- && (get_op_pinned(get_irn_op(dep)) == op_pin_state_floats)) {
- place_floats_early(dep, worklist);
+ && (get_irn_pinned(dep) == op_pin_state_floats)) {
+ place_floats_early(dep, worklist);
}
/*
been finished on them. We do not have any unfinished inputs! */
dep_block = get_nodes_block(dep);
if ((!is_Bad(dep_block)) &&
- (get_Block_dom_depth(dep_block) > depth)) {
- b = dep_block;
- depth = get_Block_dom_depth(dep_block);
+ (get_Block_dom_depth(dep_block) > depth)) {
+ b = dep_block;
+ depth = get_Block_dom_depth(dep_block);
}
/* Avoid that the node is placed in the Start block */
if ((depth == 1) && (get_Block_dom_depth(get_nodes_block(n)) > 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;
+ b = get_Block_cfg_out(get_irg_start_block(current_ir_graph), 0);
+ assert(b != get_irg_start_block(current_ir_graph));
+ depth = 2;
}
}
set_nodes_block(n, b);
* 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) {
+static INLINE void place_early(pdeq *worklist) {
assert(worklist);
inc_irg_visited(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);
+ if (!dca) return 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. */
+/** 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)
{
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) {
- block = get_nodes_block(get_Block_cfgpred(phi_block, i));
+ ir_node *new_block = get_nodes_block(get_Block_cfgpred(phi_block, i));
+
+ block = calc_dca(block, new_block);
}
}
} else {
}
/* Compute the deepest common ancestor of block and dca. */
- assert(block);
- if (!dca) return 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;
+ return calc_dca(dca, block);
}
static INLINE int get_irn_loop_depth(ir_node *n) {
best = dca;
while (dca != early) {
dca = get_Block_idom(dca);
- if (!dca) break; /* should we put assert(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;
}
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)) &&
/* Remember the early placement of this block to move it
out of loop no further than the early placement. */
early = get_nodes_block(n);
+
+ /* Do not move code not reachable from Start. For
+ * these we could not compute dominator information. */
+ if (is_Bad(early) || get_Block_dom_depth(early) == -1)
+ return;
+
/* 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
for (i = 0; i < get_irn_n_outs(n); 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);
+ place_floats_late(succ, worklist);
}
/* We have to determine the final block of this node... except for
constants. */
- if ((get_op_pinned(get_irn_op(n)) == op_pin_state_floats) &&
- (get_irn_op(n) != op_Const) &&
- (get_irn_op(n) != op_SymConst)) {
+ 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 = 0; i < get_irn_n_outs(n); i++) {
- dca = consumer_dom_dca (dca, get_irn_out(n, i), n);
+ ir_node *out = get_irn_out(n, i);
+ /* ignore if out is in dead code */
+ ir_node *outbl = get_nodes_block(out);
+ if (is_Bad(outbl) || get_Block_dom_depth(outbl) == -1)
+ continue;
+ dca = consumer_dom_dca (dca, out, n);
}
- set_nodes_block(n, dca);
+ if (dca) {
+ set_nodes_block(n, dca);
- move_out_of_loops (n, early);
+ move_out_of_loops (n, early);
+ }
+ /* else all outs are in dead code */
}
}
- mark_irn_visited(n);
-
/* Add predecessors of all non-floating nodes on list. (Those of floating
nodes are placeded 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, get_irn_out(n, i));
+ pdeq_putr (worklist, succ);
}
}
}
-static INLINE void place_late(pdeq* worklist) {
+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);
}
void place_code(ir_graph *irg) {
- pdeq* worklist;
+ pdeq *worklist;
ir_graph *rem = current_ir_graph;
current_ir_graph = irg;
current_ir_graph = rem;
}
-
-
-/********************************************************************/
-/* Control flow optimization. */
-/* Removes Bad control flow predecessors and empty blocks. A block */
-/* is empty if it contains only a Jmp node. */
-/* Blocks can only be removed if they are not needed for the */
-/* semantics of Phi nodes. */
-/********************************************************************/
-
-/**
- * Removes Tuples from Block control flow predecessors.
- * Optimizes blocks with equivalent_node().
- * Replaces n by Bad if n is unreachable control flow.
- */
-static void merge_blocks(ir_node *n, void *env) {
- int i;
- set_irn_link(n, NULL);
-
- if (get_irn_op(n) == op_Block) {
- /* Remove Tuples */
- for (i = 0; i < get_Block_n_cfgpreds(n); i++)
- /* GL @@@ : is this possible? if (get_opt_normalize()) -- added, all tests go through.
- A different order of optimizations might cause problems. */
- if (get_opt_normalize())
- set_Block_cfgpred(n, i, skip_Tuple(get_Block_cfgpred(n, i)));
- } else if (get_opt_optimize() && (get_irn_mode(n) == mode_X)) {
- /* We will soon visit a block. Optimize it before visiting! */
- ir_node *b = get_nodes_block(n);
- ir_node *new_node = equivalent_node(b);
- while (irn_not_visited(b) && (!is_Bad(new_node)) && (new_node != b)) {
- /* We would have to run gigo if new is bad, so we
- promote it directly below. */
- assert(((b == new_node) ||
- get_opt_control_flow_straightening() ||
- get_opt_control_flow_weak_simplification()) &&
- ("strange flag setting"));
- exchange (b, new_node);
- b = new_node;
- new_node = equivalent_node(b);
- }
- if (is_Bad(new_node) && get_opt_normalize()) exchange(n, new_Bad());
- }
-}
-
-/**
- * Collects all Phi nodes in link list of Block.
- * Marks all blocks "block_visited" if they contain a node other
- * than Jmp.
- */
-static void collect_nodes(ir_node *n, void *env) {
- if (is_no_Block(n)) {
- ir_node *b = get_nodes_block(n);
-
- if ((get_irn_op(n) == op_Phi)) {
- /* Collect Phi nodes to compact ins along with block's ins. */
- set_irn_link(n, get_irn_link(b));
- set_irn_link(b, n);
- } else if ((get_irn_op(n) != op_Jmp) && !is_Bad(b)) { /* Check for non empty block. */
- mark_Block_block_visited(b);
- }
- }
-}
-
-/** Returns true if pred is predecessor of block. */
-static int is_pred_of(ir_node *pred, ir_node *b) {
- int i;
- for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
- ir_node *b_pred = get_nodes_block(get_Block_cfgpred(b, i));
- if (b_pred == pred) return 1;
- }
- return 0;
-}
-
-static int test_whether_dispensable(ir_node *b, int pos) {
- int i, j, n_preds = 1;
- int dispensable = 1;
- ir_node *cfop = get_Block_cfgpred(b, pos);
- ir_node *pred = get_nodes_block(cfop);
-
- if (get_Block_block_visited(pred) + 1
- < get_irg_block_visited(current_ir_graph)) {
- if (!get_opt_optimize() || !get_opt_control_flow_strong_simplification()) {
- /* Mark block so that is will not be removed. */
- set_Block_block_visited(pred, get_irg_block_visited(current_ir_graph)-1);
- return 1;
- }
- /* Seems to be empty. */
- if (!get_irn_link(b)) {
- /* There are no Phi nodes ==> dispensable. */
- n_preds = get_Block_n_cfgpreds(pred);
- } else {
- /* b's pred blocks and pred's pred blocks must be pairwise disjunct.
- Work preds < pos as if they were already removed. */
- for (i = 0; i < pos; i++) {
- ir_node *b_pred = get_nodes_block(get_Block_cfgpred(b, i));
- if (get_Block_block_visited(b_pred) + 1
- < get_irg_block_visited(current_ir_graph)) {
- for (j = 0; j < get_Block_n_cfgpreds(b_pred); j++) {
- ir_node *b_pred_pred = get_nodes_block(get_Block_cfgpred(b_pred, j));
- if (is_pred_of(b_pred_pred, pred)) dispensable = 0;
- }
- } else {
- if (is_pred_of(b_pred, pred)) dispensable = 0;
- }
- }
- for (i = pos +1; i < get_Block_n_cfgpreds(b); i++) {
- ir_node *b_pred = get_nodes_block(get_Block_cfgpred(b, i));
- if (is_pred_of(b_pred, pred)) dispensable = 0;
- }
- if (!dispensable) {
- set_Block_block_visited(pred, get_irg_block_visited(current_ir_graph)-1);
- n_preds = 1;
- } else {
- n_preds = get_Block_n_cfgpreds(pred);
- }
- }
- }
-
- return n_preds;
-}
-
-static void optimize_blocks(ir_node *b, void *env) {
- int i, j, k, max_preds, n_preds;
- ir_node *pred, *phi;
- ir_node **in;
-
- /* Count the number of predecessor if this block is merged with pred blocks
- that are empty. */
- max_preds = 0;
- for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
- max_preds += test_whether_dispensable(b, i);
- }
- in = (ir_node **) malloc(max_preds * sizeof(ir_node *));
-
-/*-
- printf(" working on "); DDMN(b);
- for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
- pred = get_nodes_block(get_Block_cfgpred(b, i));
- if (is_Bad(get_Block_cfgpred(b, i))) {
- printf(" removing Bad %i\n ", i);
- } else if (get_Block_block_visited(pred) +1
- < get_irg_block_visited(current_ir_graph)) {
- printf(" removing pred %i ", i); DDMN(pred);
- } else { printf(" Nothing to do for "); DDMN(pred); }
- }
- * end Debug output -*/
-
- /*- Fix the Phi nodes -*/
- phi = get_irn_link(b);
- while (phi) {
- assert(get_irn_op(phi) == op_Phi);
- /* Find the new predecessors for the Phi */
- n_preds = 0;
- for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
- pred = get_nodes_block(get_Block_cfgpred(b, i));
- if (is_Bad(get_Block_cfgpred(b, i))) {
- /* Do nothing */
- } else if (get_Block_block_visited(pred) +1
- < get_irg_block_visited(current_ir_graph)) {
- /* It's an empty block and not yet visited. */
- ir_node *phi_pred = get_Phi_pred(phi, i);
- for (j = 0; j < get_Block_n_cfgpreds(pred); j++) {
- if (get_nodes_block(phi_pred) == pred) {
- assert(get_irn_op(phi_pred) == op_Phi); /* Block is empty!! */
- in[n_preds] = get_Phi_pred(phi_pred, j);
- } else {
- in[n_preds] = phi_pred;
- }
- n_preds++;
- }
- /* The Phi_pred node is replaced now if it is a Phi.
- In Schleifen kann offenbar der entfernte Phi Knoten legal verwendet werden.
- Daher muss der Phiknoten durch den neuen ersetzt werden.
- Weiter muss der alte Phiknoten entfernt werden (durch ersetzen oder
- durch einen Bad) damit er aus den keep_alive verschwinden kann.
- Man sollte also, falls keine Schleife vorliegt, exchange mit new_Bad
- aufrufen. */
- if (get_nodes_block(phi_pred) == pred) {
- /* remove the Phi as it might be kept alive. Further there
- might be other users. */
- exchange(phi_pred, phi); /* geht, ist aber doch semantisch falsch! Warum?? */
- }
- } else {
- in[n_preds] = get_Phi_pred(phi, i);
- n_preds ++;
- }
- }
- /* Fix the node */
- set_irn_in(phi, n_preds, in);
-
- phi = get_irn_link(phi);
- }
-
-/*-
- This happens only if merge between loop backedge and single loop entry. -*/
- for (k = 0; k < get_Block_n_cfgpreds(b); k++) {
- pred = get_nodes_block(get_Block_cfgpred(b, k));
- if (get_Block_block_visited(pred)+1 < get_irg_block_visited(current_ir_graph)) {
- phi = get_irn_link(pred);
- while (phi) {
- if (get_irn_op(phi) == op_Phi) {
- set_nodes_block(phi, b);
-
- n_preds = 0;
- for (i = 0; i < k; i++) {
- pred = get_nodes_block(get_Block_cfgpred(b, i));
- if (is_Bad(get_Block_cfgpred(b, i))) {
- /* Do nothing */
- } else if (get_Block_block_visited(pred) +1
- < get_irg_block_visited(current_ir_graph)) {
- /* It's an empty block and not yet visited. */
- for (j = 0; j < get_Block_n_cfgpreds(pred); j++) {
- /* @@@ Hier brauche ich Schleifeninformation!!! Kontrollflusskante
- muss Rueckwaertskante sein! (An allen vier in[n_preds] = phi
- Anweisungen.) Trotzdem tuts bisher!! */
- in[n_preds] = phi;
- n_preds++;
- }
- } else {
- in[n_preds] = phi;
- n_preds++;
- }
- }
- for (i = 0; i < get_Phi_n_preds(phi); i++) {
- in[n_preds] = get_Phi_pred(phi, i);
- n_preds++;
- }
- for (i = k+1; i < get_Block_n_cfgpreds(b); i++) {
- pred = get_nodes_block(get_Block_cfgpred(b, i));
- if (is_Bad(get_Block_cfgpred(b, i))) {
- /* Do nothing */
- } else if (get_Block_block_visited(pred) +1
- < get_irg_block_visited(current_ir_graph)) {
- /* It's an empty block and not yet visited. */
- for (j = 0; j < get_Block_n_cfgpreds(pred); j++) {
- in[n_preds] = phi;
- n_preds++;
- }
- } else {
- in[n_preds] = phi;
- n_preds++;
- }
- }
- set_irn_in(phi, n_preds, in);
- }
- phi = get_irn_link(phi);
- }
- }
- }
-
- /*- Fix the block -*/
- n_preds = 0;
- for (i = 0; i < get_Block_n_cfgpreds(b); i++) {
- pred = get_nodes_block(get_Block_cfgpred(b, i));
- if (is_Bad(get_Block_cfgpred(b, i))) {
- /* Do nothing */
- } else if (get_Block_block_visited(pred) +1
- < get_irg_block_visited(current_ir_graph)) {
- /* It's an empty block and not yet visited. */
- assert(get_Block_n_cfgpreds(b) > 1);
- /* Else it should be optimized by equivalent_node. */
- for (j = 0; j < get_Block_n_cfgpreds(pred); j++) {
- in[n_preds] = get_Block_cfgpred(pred, j);
- n_preds++;
- }
- /* Remove block as it might be kept alive. */
- exchange(pred, b/*new_Bad()*/);
- } else {
- in[n_preds] = get_Block_cfgpred(b, i);
- n_preds ++;
- }
- }
- set_irn_in(b, n_preds, in);
- free(in);
-}
-
-void optimize_cf(ir_graph *irg) {
- int i;
- ir_node **in;
- ir_node *end = get_irg_end(irg);
- ir_graph *rem = current_ir_graph;
- current_ir_graph = irg;
-
- /* Handle graph state */
- assert(get_irg_phase_state(irg) != phase_building);
- 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);
-
- /* Use block visited flag to mark non-empty blocks. */
- inc_irg_block_visited(irg);
- irg_walk(end, merge_blocks, collect_nodes, NULL);
-
- /* Optimize the standard code. */
- irg_block_walk(get_irg_end_block(irg), optimize_blocks, NULL, NULL);
-
- /* Walk all keep alives, optimize them if block, add to new in-array
- for end if useful. */
- in = NEW_ARR_F (ir_node *, 1);
- in[0] = get_nodes_block(end);
- inc_irg_visited(current_ir_graph);
- for(i = 0; i < get_End_n_keepalives(end); i++) {
- ir_node *ka = get_End_keepalive(end, i);
- if (irn_not_visited(ka)) {
- if ((get_irn_op(ka) == op_Block) && Block_not_block_visited(ka)) {
- set_irg_block_visited(current_ir_graph, /* Don't walk all the way to Start. */
- get_irg_block_visited(current_ir_graph)-1);
- irg_block_walk(ka, optimize_blocks, NULL, NULL);
- mark_irn_visited(ka);
- ARR_APP1 (ir_node *, in, ka);
- } else if (get_irn_op(ka) == op_Phi) {
- mark_irn_visited(ka);
- ARR_APP1 (ir_node *, in, ka);
- }
- }
- }
- /* DEL_ARR_F(end->in); GL @@@ tut nicht ! */
- end->in = in;
-
- current_ir_graph = rem;
-}
-
-
/**
* Called by walker of remove_critical_cf_edges().
*
projects / libfirm / blobdiff