/*
- * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
- *
* This file is part of libFirm.
- *
- * This file may be distributed and/or modified under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation and appearing in the file LICENSE.GPL included in the
- * packaging of this file.
- *
- * Licensees holding valid libFirm Professional Edition licenses may use
- * this file in accordance with the libFirm Commercial License.
- * Agreement provided with the Software.
- *
- * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
- * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
/**
* @file
* @brief modifies schedule so flags dependencies are respected.
* @author Matthias Braun, Christoph Mallon
- * @version $Id: besched.h 14693 2007-06-21 15:35:49Z beck $
*
* Fixup schedule to respect flag constraints by moving and rematerialisation of
* nodes.
#include "beflags.h"
#include "bearch.h"
#include "beirg.h"
+#include "beirgmod.h"
#include "besched.h"
#include "benode.h"
#include "belive.h"
+#include "beabihelper.h"
-static const arch_register_class_t *flag_class = NULL;
-static const arch_register_t *flags_reg = NULL;
-static func_rematerialize remat = NULL;
+static const arch_register_class_t *flag_class;
+static const arch_register_t *flags_reg;
+static func_rematerialize remat;
+static check_modifies_flags check_modify;
static int changed;
static ir_node *default_remat(ir_node *node, ir_node *after)
return copy;
}
+static bool default_check_modifies(const ir_node *node)
+{
+ return arch_irn_is(node, modify_flags);
+}
+
/**
* tests whether we can legally move node node after node after
* (only works for nodes in same block)
*/
static bool can_move(ir_node *node, ir_node *after)
{
- const ir_edge_t *edge;
- assert(get_nodes_block(node) == get_nodes_block(after));
+ ir_node *node_block = get_nodes_block(node);
+ assert(node_block == get_nodes_block(after));
/* TODO respect dep edges */
assert(get_irn_n_edges_kind(node, EDGE_KIND_DEP) == 0);
foreach_out_edge(node, edge) {
ir_node *out = get_edge_src_irn(edge);
if (is_Proj(out)) {
- const ir_edge_t *edge2;
assert(get_irn_n_edges_kind(out, EDGE_KIND_DEP) == 0);
foreach_out_edge(out, edge2) {
ir_node *out2 = get_edge_src_irn(edge2);
+ if (get_nodes_block(out2) != node_block)
+ continue;
/* Phi or End represents a usage at block end. */
if (is_Phi(out2) || is_End(out2))
continue;
if (is_Sync(out2)) {
- const ir_edge_t *edge3;
foreach_out_edge(out2, edge3) {
ir_node *out3 = get_edge_src_irn(edge3);
/* Phi or End represents a usage at block end. */
}
}
} else {
+ if (get_nodes_block(out) != node_block)
+ continue;
/* phi represents a usage at block end */
if (is_Phi(out))
continue;
}
static void rematerialize_or_move(ir_node *flags_needed, ir_node *node,
- ir_node *flag_consumers, int pn, be_lv_t *lv)
+ ir_node *flag_consumers, int pn)
{
ir_node *n;
ir_node *copy;
if (get_irn_mode(copy) == mode_T) {
ir_mode *mode = flag_class->mode;
value = new_rd_Proj(NULL, copy, mode, pn);
+ be_add_missing_keeps_node(copy);
} else {
value = copy;
}
break;
}
}
- n = get_irn_link(n);
+ n = (ir_node*)get_irn_link(n);
} while (n != NULL);
/* No need to introduce the copy, because it only lives in this block, but
* we have to update the liveness of all operands */
if (is_Block(node) ||
get_nodes_block(node) != get_nodes_block(flags_needed)) {
- int i;
+ ir_graph *irg = get_irn_irg(node);
+ be_lv_t *lv = be_get_irg_liveness(irg);
+ int i;
if (lv != NULL) {
for (i = get_irn_arity(copy) - 1; i >= 0; --i) {
}
}
-static bool is_modify_flags(ir_node *node)
-{
- return arch_irn_is(node, modify_flags);
-}
-
/**
* walks up the schedule and makes sure there are no flag-destroying nodes
* between a flag-consumer -> flag-producer chain. Fixes problematic situations
*/
static void fix_flags_walker(ir_node *block, void *env)
{
- ir_node *node;
ir_node *flags_needed = NULL;
ir_node *flag_consumers = NULL;
int pn = -1;
+ (void) env;
+ ir_node *place = block;
sched_foreach_reverse(block, node) {
int i, arity;
ir_node *new_flags_needed = NULL;
ir_node *test;
- if (is_Phi(node))
+ if (is_Phi(node)) {
+ place = node;
break;
+ }
if (node == flags_needed) {
/* all ok */
if (be_is_Keep(test))
test = sched_prev(test);
- if (flags_needed != NULL && is_modify_flags(test)) {
+ if (flags_needed != NULL && check_modify(test)) {
/* rematerialize */
- rematerialize_or_move(flags_needed, node, flag_consumers, pn, env);
+ rematerialize_or_move(flags_needed, node, flag_consumers, pn);
flags_needed = NULL;
flag_consumers = NULL;
}
/* test whether the current node needs flags */
arity = get_irn_arity(node);
for (i = 0; i < arity; ++i) {
- const arch_register_class_t *cls = arch_get_irn_reg_class(node, i);
- if (cls == flag_class) {
+ const arch_register_req_t *req
+ = arch_get_irn_register_req_in(node, i);
+ if (req->cls == flag_class) {
assert(new_flags_needed == NULL);
new_flags_needed = get_irn_n(node, i);
}
if (skip_Proj(new_flags_needed) != flags_needed) {
if (flags_needed != NULL) {
/* rematerialize node */
- rematerialize_or_move(flags_needed, node, flag_consumers, pn, env);
+ rematerialize_or_move(flags_needed, node, flag_consumers, pn);
flags_needed = NULL;
flag_consumers = NULL;
}
if (flags_needed != NULL) {
assert(get_nodes_block(flags_needed) != block);
- rematerialize_or_move(flags_needed, node, flag_consumers, pn, env);
+ rematerialize_or_move(flags_needed, place, flag_consumers, pn);
flags_needed = NULL;
flag_consumers = NULL;
}
}
void be_sched_fix_flags(ir_graph *irg, const arch_register_class_t *flag_cls,
- func_rematerialize remat_func)
+ func_rematerialize remat_func,
+ check_modifies_flags check_modifies_flags_func)
{
- flag_class = flag_cls;
- flags_reg = & flag_class->regs[0];
- remat = remat_func;
- changed = 0;
+ flag_class = flag_cls;
+ flags_reg = & flag_class->regs[0];
+ remat = remat_func;
+ check_modify = check_modifies_flags_func;
+ changed = 0;
if (remat == NULL)
remat = &default_remat;
+ if (check_modify == NULL)
+ check_modify = &default_check_modifies;
ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
- irg_block_walk_graph(irg, fix_flags_walker, NULL, be_get_irg_liveness(irg));
+ irg_block_walk_graph(irg, fix_flags_walker, NULL, NULL);
ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
if (changed) {
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