-/**
- * Chordal register allocation.
- * @author Sebastian Hack
- * @date 8.12.2004
- * @cvs-id $Id$
+/*
+ * Copyright (C) 1995-2007 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.
*
- * Copyright (C) Universitaet Karlsruhe
- * Released under the GPL
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+
+/**
+ * @file
+ * @brief Chordal register allocation.
+ * @author Sebastian Hack
+ * @date 08.12.2004
+ * @version $Id$
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#include "irdump.h"
#include "irdom.h"
#include "irtools.h"
+#include "irbitset.h"
#include "debug.h"
#include "xmalloc.h"
+#include "iredges.h"
#include "beutil.h"
#include "besched.h"
#include "beinsn_t.h"
#include "bestatevent.h"
#include "beirg_t.h"
-
+#include "beintlive_t.h"
+#include "bera.h"
#include "bechordal_t.h"
#include "bechordal_draw.h"
+#include "bemodule.h"
DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
#define DUMP_INTERVALS
+/* new style assign routine without borders. */
+#undef NEW_STYLE_ASSIGN
+
typedef struct _be_chordal_alloc_env_t {
be_chordal_env_t *chordal_env;
*/
static INLINE int has_reg_class(const be_chordal_env_t *env, const ir_node *irn)
{
- return arch_irn_has_reg_class(env->birg->main_env->arch_env, irn, -1, env->cls);
- // return arch_irn_consider_in_reg_alloc(env->birg->main_env->arch_env, env->cls, irn);
+ return arch_irn_consider_in_reg_alloc(env->birg->main_env->arch_env, env->cls, irn);
}
#define has_limited_constr(req, irn) \
static ir_node *prepare_constr_insn(be_chordal_env_t *env, ir_node *irn)
{
- const arch_env_t *aenv = env->birg->main_env->arch_env;
+ const be_irg_t *birg = env->birg;
+ const arch_env_t *aenv = birg->main_env->arch_env;
bitset_t *tmp = bitset_alloca(env->cls->n_regs);
bitset_t *def_constr = bitset_alloca(env->cls->n_regs);
ir_node *bl = get_nodes_block(irn);
if(a_op->carrier != op->carrier || !a_op->has_constraints)
continue;
+ if (be_is_Copy(get_irn_n(insn->irn, a_op->pos)))
+ continue;
+
copy = be_new_Copy(env->cls, env->irg, bl, op->carrier);
be_stat_ev("constr_copy", 1);
3) is constrained to a register occuring in out constraints.
*/
if(!op->has_constraints ||
- !values_interfere(lv, insn->irn, op->carrier) ||
+ !values_interfere(birg, insn->irn, op->carrier) ||
bitset_popcnt(tmp) == 0)
continue;
Copies and Keeps for operands which must be different from the results.
Additional copies here would destroy this.
*/
- if(be_is_Copy(op->carrier))
+ if (be_is_Copy(get_irn_n(insn->irn, op->pos)))
continue;
copy = be_new_Copy(env->cls, env->irg, bl, op->carrier);
int n_defs = be_insn_n_defs(insn);
bitset_t *bs = bitset_alloca(env->cls->n_regs);
int *pairing = alloca(MAX(n_defs, n_uses) * sizeof(pairing[0]));
- be_lv_t *lv = env->birg->lv;
int i, j;
if (op->partner != NULL)
continue;
- if (values_interfere(lv, op->irn, op->carrier))
+ if (values_interfere(env->birg, op->irn, op->carrier))
continue;
bitset_clear_all(bs);
int *assignment;
pmap *partners;
int i, n_alloc;
- long col;
+ bitset_pos_t col;
const ir_edge_t *edge;
ir_node *perm = NULL;
int match_res, cost;
be_insn_t *insn = chordal_scan_insn(env, irn);
ir_node *res = insn->next_insn;
int be_silent = *silent;
- be_lv_t *lv = env->birg->lv;
+ be_irg_t *birg = env->birg;
if(insn->pre_colored) {
int i;
assert(is_Proj(proj));
- if(!values_interfere(lv, proj, irn) || pmap_contains(partners, proj))
+ if(!values_interfere(birg, proj, irn) || pmap_contains(partners, proj))
continue;
assert(n_alloc < n_regs);
be_lv_t *lv = env->birg->lv;
int i, n;
+ bitset_pos_t elm;
unsigned step = 0;
unsigned pressure = 0;
struct list_head *head;
- pset *live_in = be_lv_pset_put_in(lv, block, pset_new_ptr_default());
- pset *live_end = be_lv_pset_put_end(lv, block, pset_new_ptr_default());
DBG((dbg, LEVEL_1, "Computing pressure in block %+F\n", block));
bitset_clear_all(live);
* Make final uses of all values live out of the block.
* They are necessary to build up real intervals.
*/
- foreach_pset(live_end, irn) {
+ be_lv_foreach(lv, block, be_lv_state_end, i) {
+ ir_node *irn = be_lv_get_irn(lv, block, i);
if(has_reg_class(env, irn)) {
DBG((dbg, LEVEL_3, "\tMaking live: %+F/%d\n", irn, get_irn_idx(irn)));
bitset_set(live, get_irn_idx(irn));
DBG((dbg, LEVEL_1, "\tinsn: %+F, pressure: %d\n", irn, pressure));
DBG((dbg, LEVEL_2, "\tlive: %B\n", live));
+#ifndef SCHEDULE_PROJS
+ if (get_irn_mode(irn) == mode_T) {
+ const ir_edge_t *edge;
+
+ foreach_out_edge(irn, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+
+ /*
+ * If the node defines some value, which can put into a
+ * register of the current class, make a border for it.
+ */
+ if(has_reg_class(env, proj)) {
+ int nr = get_irn_idx(proj);
+
+ bitset_clear(live, nr);
+ border_def(proj, step, 1);
+ }
+ }
+ }
+#endif
/*
* If the node defines some value, which can put into a
* register of the current class, make a border for it.
++step;
}
- /*
- * Add initial defs for all values live in.
- */
- foreach_pset(live_in, irn) {
- if(has_reg_class(env, irn)) {
-
- /* Mark the value live in. */
- bitset_set(live, get_irn_idx(irn));
-
- /* Add the def */
+ bitset_foreach(live, elm) {
+ ir_node *irn = get_idx_irn(env->irg, elm);
+ if (be_is_live_in(lv, block, irn))
border_def(irn, step, 0);
- }
}
-
- del_pset(live_in);
- del_pset(live_end);
}
static void assign(ir_node *block, void *env_ptr)
del_pset(live_in);
}
+/**
+ * A new assign...
+ */
+static void assign_new(ir_node *block, be_chordal_alloc_env_t *alloc_env, bitset_t *live_end_dom)
+{
+ be_chordal_env_t *env = alloc_env->chordal_env;
+ bitset_t *colors = alloc_env->colors;
+ bitset_t *in_colors = alloc_env->in_colors;
+ bitset_t *live = bitset_irg_malloc(env->irg);
+ const arch_env_t *arch_env = env->birg->main_env->arch_env;
+ be_irg_t *birg = env->birg;
+
+ bitset_pos_t elm;
+ ir_node *irn;
+
+ bitset_clear_all(colors);
+ bitset_clear_all(in_colors);
+
+ /*
+ * All variables which are live in to this block are live out
+ * of the immediate dominator thanks to SSA properties. As we
+ * have already visited the immediate dominator, we know these
+ * variables. The only tjing left is to check wheather they are live
+ * in here (they also could be phi arguments to some ohi not
+ * in this block, hence we have to check).
+ */
+ bitset_foreach (live_end_dom, elm) {
+ ir_node *irn = get_idx_irn(env->irg, elm);
+ if (be_is_live_in(birg->lv, block, irn)) {
+ const arch_register_t *reg = arch_get_irn_register(arch_env, irn);
+ int col;
+
+ assert(be_is_live_in(env->birg->lv, block, irn));
+ assert(reg && "Node must have been assigned a register");
+ col = arch_register_get_index(reg);
+
+ DBG((dbg, LEVEL_4, "%+F has reg %s\n", irn, reg->name));
+
+ /* Mark the color of the live in value as used. */
+ bitset_set(colors, col);
+ bitset_set(in_colors, col);
+
+ /* Mark the value live in. */
+ bitset_set(live, elm);
+ }
+
+ else {
+ assert(!be_is_live_in(env->birg->lv, block, irn));
+ }
+ }
+
+ /*
+ * Mind that the sequence of defs from back to front defines a perfect
+ * elimination order. So, coloring the definitions from first to last
+ * will work.
+ */
+ sched_foreach (block, irn) {
+ int nr = get_irn_idx(irn);
+ int ignore = arch_irn_is(arch_env, irn, ignore);
+
+ /* Clear the color upon a last use. */
+ if(!is_Phi(irn)) {
+ int i;
+ for (i = get_irn_arity(irn) - 1; i >= 0; --i) {
+ ir_node *op = get_irn_n(irn, i);
+
+ /*
+ * If the reg class matches and the operand is not live after
+ * the node, irn is a last use of op and the register can
+ * be freed.
+ */
+ if (has_reg_class(env, op)) {
+ if (!be_lv_chk_after_irn(birg, op, irn)) {
+ const arch_register_t *reg = arch_get_irn_register(arch_env, op);
+ int col;
+
+ assert(reg && "Register must have been assigned");
+ col = arch_register_get_index(reg);
+ bitset_clear(colors, col);
+ bitset_clear(live, nr);
+ }
+ }
+ }
+ }
+
+ if (has_reg_class(env, irn)) {
+ const arch_register_t *reg;
+ int col = NO_COLOR;
+
+ /*
+ * Assign a color, if it is a local def. Global defs already have a
+ * color.
+ */
+ if(ignore || pset_find_ptr(alloc_env->pre_colored, irn)) {
+ reg = arch_get_irn_register(arch_env, irn);
+ col = reg->index;
+ assert(!bitset_is_set(colors, col) && "pre-colored register must be free");
+ } else {
+ col = get_next_free_reg(alloc_env, colors);
+ reg = arch_register_for_index(env->cls, col);
+ assert(arch_get_irn_register(arch_env, irn) == NULL && "This node must not have been assigned a register yet");
+ assert(!arch_register_type_is(reg, ignore) && "Must not assign ignore register");
+ }
+
+ bitset_set(colors, col);
+ arch_set_irn_register(arch_env, irn, reg);
+
+ DBG((dbg, LEVEL_1, "\tassigning register %s(%d) to %+F\n", arch_register_get_name(reg), col, irn));
+
+ assert(!bitset_is_set(live, nr) && "Value's definition must not have been encountered");
+ bitset_set(live, nr);
+ }
+
+ }
+
+ dominates_for_each (block, irn) {
+ assign_new(irn, alloc_env, live);
+ }
+
+ bitset_free(live);
+}
+
void be_ra_chordal_color(be_chordal_env_t *chordal_env)
{
be_chordal_alloc_env_t env;
char buf[256];
+ be_lv_t *lv;
be_irg_t *birg = chordal_env->birg;
const arch_register_class_t *cls = chordal_env->cls;
return;
be_assure_dom_front(birg);
- be_assure_liveness(birg);
+ lv = be_assure_liveness(birg);
+ be_liveness_assure_sets(lv);
+ be_liveness_assure_chk(lv);
+
assure_doms(irg);
env.chordal_env = chordal_env;
dom_tree_walk_irg(irg, pressure, NULL, &env);
/* Assign the colors */
+#ifdef NEW_STYLE_ASSIGN
+ assign_new(get_irg_start_block(irg), &env, env.live);
+#else
dom_tree_walk_irg(irg, assign, NULL, &env);
+#endif
if(chordal_env->opts->dump_flags & BE_CH_DUMP_TREE_INTV) {
plotter_t *plotter;
void be_init_chordal(void)
{
- FIRM_DBG_REGISTER(dbg, "firm.be.chordal.constr");
+ FIRM_DBG_REGISTER(dbg, "firm.be.chordal");
}
BE_REGISTER_MODULE_CONSTRUCTOR(be_init_chordal);
projects / libfirm / blobdiff