#include "config.h"
#endif
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+
+#ifdef HAVE_ALLOCA_H
+#include <alloca.h>
+#endif
+
#include <ctype.h>
#include "obst.h"
#include "list.h"
#include "bitset.h"
#include "iterator.h"
+#include "bipartite.h"
#include "irmode_t.h"
#include "irgraph_t.h"
#include "benumb_t.h"
#include "besched_t.h"
#include "belive_t.h"
+#include "benode_t.h"
#include "bearch.h"
#include "beifg.h"
#define NO_COLOR (-1)
-#undef DUMP_INTERVALS
+#define DUMP_INTERVALS
typedef struct _be_chordal_alloc_env_t {
be_chordal_env_t *chordal_env;
+ pset *pre_colored; /**< Set of precolored nodes. */
bitset_t *live; /**< A liveness bitset. */
bitset_t *colors; /**< The color mask. */
+ bitset_t *ignore_colors; /**< A mask of colors which shall be not used in allocation (ignored). */
bitset_t *in_colors; /**< Colors used by live in values. */
int colors_n; /**< The number of colors. */
} be_chordal_alloc_env_t;
return arch_irn_has_reg_class(env->main_env->arch_env, irn, -1, env->cls);
}
+#define has_limited_constr(req, irn) \
+ (arch_get_register_req(arch_env, (req), irn, -1) && (req)->type == arch_register_req_type_limited)
+
+typedef struct _operand_t operand_t;
+
+struct _operand_t {
+ ir_node *irn;
+ ir_node *carrier;
+ operand_t *partner;
+ int pos;
+ arch_register_req_t req;
+};
+
+typedef struct {
+ operand_t *ops;
+ int n_ops;
+ int use_start;
+ ir_node *next_insn;
+ unsigned has_constraints : 1;
+} insn_t;
+
+static insn_t *scan_insn(be_chordal_env_t *env, ir_node *irn, struct obstack *obst)
+{
+ const arch_env_t *arch_env = env->main_env->arch_env;
+ operand_t o;
+ insn_t *insn;
+ int i, n;
+
+ insn = obstack_alloc(obst, sizeof(insn[0]));
+ memset(insn, 0, sizeof(insn[0]));
+
+ insn->next_insn = sched_next(irn);
+ if(get_irn_mode(irn) == mode_T) {
+ ir_node *p;
+
+ for(p = sched_next(irn); is_Proj(p); p = sched_next(p)) {
+ if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, p)) {
+ o.carrier = p;
+ o.irn = irn;
+ o.pos = -(get_Proj_proj(p) + 1);
+ o.partner = NULL;
+ arch_get_register_req(arch_env, &o.req, p, -1);
+ obstack_grow(obst, &o, sizeof(o));
+ insn->n_ops++;
+ insn->has_constraints |= arch_register_req_is(&o.req, limited);
+ }
+ }
+
+ insn->next_insn = p;
+ }
+
+ else if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, irn)) {
+ o.carrier = irn;
+ o.irn = irn;
+ o.pos = -1;
+ o.partner = NULL;
+ arch_get_register_req(arch_env, &o.req, irn, -1);
+ obstack_grow(obst, &o, sizeof(o));
+ insn->n_ops++;
+ insn->has_constraints |= arch_register_req_is(&o.req, limited);
+ }
+
+ insn->use_start = insn->n_ops;
+
+ for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+ ir_node *op = get_irn_n(irn, i);
+
+ if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, op)) {
+ o.carrier = op;
+ o.irn = irn;
+ o.pos = i;
+ o.partner = NULL;
+ arch_get_register_req(arch_env, &o.req, irn, i);
+ obstack_grow(obst, &o, sizeof(o));
+ insn->n_ops++;
+ insn->has_constraints |= arch_register_req_is(&o.req, limited);
+ }
+ }
+
+ insn->ops = obstack_finish(obst);
+ return insn;
+}
+
+static operand_t *find_unpaired_use(insn_t *insn, const operand_t *op, int can_be_constrained)
+{
+ int i;
+ operand_t *res = NULL;
+
+ for(i = insn->use_start; i < insn->n_ops; ++i) {
+ operand_t *op = &insn->ops[i];
+ int has_constraint = arch_register_req_is(&op->req, limited);
+
+ if(!values_interfere(op->carrier, op->irn) && !op->partner && (!has_constraint || can_be_constrained)) {
+ if(arch_register_req_is(&op->req, should_be_same) && op->req.other == op->carrier)
+ return op;
+ else
+ res = op;
+ }
+ }
+
+ return res;
+}
+
+static void pair_up_operands(insn_t *insn)
+{
+ firm_dbg_module_t *dbg = firm_dbg_register("firm.be.chordal.constr");
+ int i;
+
+ for(i = 0; i < insn->use_start; ++i) {
+ operand_t *op = &insn->ops[i];
+ int has_constraint = arch_register_req_is(&op->req, limited);
+ operand_t *partner = find_unpaired_use(insn, op, !has_constraint);
+
+ if(partner) {
+ op->partner = partner;
+ partner->partner = op;
+ }
+ }
+}
+
+static ir_node *handle_constraints(be_chordal_alloc_env_t *alloc_env, ir_node *irn)
+{
+ be_chordal_env_t *env = alloc_env->chordal_env;
+ void *base = obstack_base(&env->obst);
+ insn_t *insn = scan_insn(env, irn, &env->obst);
+ ir_node *res = insn->next_insn;
+
+ if(insn->has_constraints) {
+ firm_dbg_module_t *dbg = firm_dbg_register("firm.be.chordal.constr");
+ const arch_env_t *aenv = env->main_env->arch_env;
+ int n_regs = env->cls->n_regs;
+ bitset_t *bs = bitset_alloca(n_regs);
+ ir_node **alloc_nodes = alloca(n_regs * sizeof(alloc_nodes[0]));
+ bipartite_t *bp = bipartite_new(n_regs, n_regs);
+ int *assignment = alloca(n_regs * sizeof(assignment[0]));
+ pmap *partners = pmap_create();
+
+ int i, n_alloc;
+ long col;
+ const ir_edge_t *edge;
+ ir_node *perm = insert_Perm_after(aenv, env->cls, env->dom_front, sched_prev(irn));
+
+ /* Registers are propagated by insert_Perm_after(). Clean them here! */
+ if(perm) {
+ foreach_out_edge(perm, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+ arch_set_irn_register(aenv, proj, NULL);
+ }
+ }
+
+
+ be_liveness(env->irg);
+ insn = scan_insn(env, irn, &env->obst);
+
+ DBG((dbg, LEVEL_1, "handling constraints for %+F\n", irn));
+
+ /*
+ * If there was no Perm made, nothing was alive in this register class.
+ * This means, that the node has no operands, thus no input constraints.
+ * so it had output constraints. The other results then can be assigned freeliy.
+ */
+
+ pair_up_operands(insn);
+
+ for(i = 0, n_alloc = 0; i < insn->n_ops; ++i) {
+ operand_t *op = &insn->ops[i];
+ if(arch_register_req_is(&op->req, limited)) {
+ pmap_insert(partners, op->carrier, op->partner ? op->partner->carrier : NULL);
+ alloc_nodes[n_alloc] = op->carrier;
+
+ DBG((dbg, LEVEL_2, "\tassociating %+F and %+F\n", op->carrier, pmap_get(partners, op->carrier)));
+
+ bitset_clear_all(bs);
+ op->req.limited(op->req.limited_env, bs);
+ bitset_andnot(bs, alloc_env->ignore_colors);
+
+ bitset_foreach(bs, col)
+ bipartite_add(bp, n_alloc, col);
+
+ n_alloc++;
+ }
+ }
+
+ if(perm) {
+ foreach_out_edge(perm, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+
+ assert(is_Proj(proj));
+
+ if(values_interfere(proj, irn)) {
+ assert(n_alloc < n_regs);
+ alloc_nodes[n_alloc] = proj;
+ pmap_insert(partners, proj, NULL);
+
+ bitset_clear_all(bs);
+ arch_get_allocatable_regs(aenv, proj, -1, bs);
+ bitset_andnot(bs, alloc_env->ignore_colors);
+ bitset_foreach(bs, col)
+ bipartite_add(bp, n_alloc, col);
+
+ n_alloc++;
+ }
+ }
+ }
+
+ bipartite_matching(bp, assignment);
+
+ for(i = 0; i < n_alloc; ++i) {
+ int j;
+ ir_node *nodes[2];
+ const arch_register_t *reg = arch_register_for_index(env->cls, assignment[i]);
+
+ nodes[0] = alloc_nodes[i];
+ nodes[1] = pmap_get(partners, alloc_nodes[i]);
+
+ for(j = 0; j < 2; ++j) {
+ if(!nodes[j])
+ continue;
+
+ arch_set_irn_register(aenv, nodes[j], reg);
+ pset_hinsert_ptr(alloc_env->pre_colored, nodes[j]);
+ DBG((dbg, LEVEL_2, "\tsetting %+F to register %s\n", nodes[j], reg->name));
+ }
+ }
+
+
+ if(perm) {
+ bitset_clear_all(bs);
+ foreach_out_edge(perm, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+ const arch_register_t *reg = arch_get_irn_register(aenv, proj);
+
+ if(reg != NULL)
+ bitset_set(bs, reg->index);
+ }
+
+ // bitset_or(bs, alloc_env->ignore_colors);
+ foreach_out_edge(perm, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+ const arch_register_t *reg = arch_get_irn_register(aenv, proj);
+
+ DBG((dbg, LEVEL_2, "\tchecking reg of %+F: %s\n", proj, reg ? reg->name : "<none>"));
+
+ if(reg == NULL) {
+ col = bitset_next_clear(bs, 0);
+ reg = arch_register_for_index(env->cls, col);
+ bitset_set(bs, reg->index);
+ arch_set_irn_register(aenv, proj, reg);
+ pset_insert_ptr(alloc_env->pre_colored, proj);
+ DBG((dbg, LEVEL_2, "\tsetting %+F to register %s\n", proj, reg->name));
+ }
+ }
+ }
+
+ pmap_destroy(partners);
+ }
+
+ obstack_free(&env->obst, base);
+ return res;
+}
+
+/**
+ * Handle constraint nodes in each basic block.
+ * be_insert_constr_perms() inserts Perm nodes which perm
+ * over all values live at the constrained node right in front
+ * of the constrained node. These Perms signal a constrained node.
+ * For further comments, refer to handle_constraints_at_perm().
+ */
+static void constraints(ir_node *bl, void *data)
+{
+ firm_dbg_module_t *dbg = firm_dbg_register("firm.be.chordal.constr");
+ be_chordal_alloc_env_t *env = data;
+ arch_env_t *arch_env = env->chordal_env->main_env->arch_env;
+ ir_node *irn;
+
+ for(irn = sched_first(bl); !sched_is_end(irn);) {
+ irn = handle_constraints(env, irn);
+ }
+}
+
/**
* Annotate the register pressure to the nodes and compute
* the liveness intervals.
DBG((dbg, LEVEL_1, "\tinsn: %+F, pressure: %d\n", irn, pressure));
DBG((dbg, LEVEL_2, "\tlive: %b\n", live));
- /*
- * If the node defines some value, which can put into a
- * register of the current class, make a border for it.
- */
+ /*
+ * 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, irn)) {
int nr = get_irn_graph_nr(irn);
const arch_register_t *reg;
int col = NO_COLOR;
- DBG((dbg, LEVEL_4, "\tcolors in use: %b\n", colors));
-
- col = bitset_next_clear(colors, 0);
- reg = arch_register_for_index(env->cls, col);
+ if(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");
+ }
- assert(arch_get_irn_register(arch_env, irn) == NULL && "This node must not have been assigned a register yet");
- assert(!bitset_is_set(live, nr) && "Value's definition must not have been encountered");
+ else {
+ col = bitset_next_clear(colors, 0);
+ 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");
+ }
bitset_set(colors, col);
- bitset_set(live, nr);
-
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);
}
/* Clear the color upon a use. */
del_pset(live_in);
}
+
+
void be_ra_chordal_color(be_chordal_env_t *chordal_env)
{
- int node_count = get_graph_node_count(chordal_env->irg);
+ int i;
int colors_n = arch_register_class_n_regs(chordal_env->cls);
ir_graph *irg = chordal_env->irg;
- void *base = obstack_base(&chordal_env->obst);
be_chordal_alloc_env_t env;
if(get_irg_dom_state(irg) != dom_consistent)
compute_doms(irg);
- env.chordal_env = chordal_env;
- env.live = bitset_obstack_alloc(&chordal_env->obst, node_count);
- env.colors = bitset_obstack_alloc(&chordal_env->obst, colors_n);
- env.in_colors = bitset_obstack_alloc(&chordal_env->obst, colors_n);
- env.colors_n = colors_n;
+ env.chordal_env = chordal_env;
+ env.colors_n = colors_n;
+ env.colors = bitset_malloc(colors_n);
+ env.ignore_colors = bitset_malloc(colors_n);
+ env.in_colors = bitset_malloc(colors_n);
+ env.pre_colored = pset_new_ptr_default();
+
+ bitset_clear_all(env.ignore_colors);
+#if 0
+ for(i = 0; i < chordal_env->cls->n_regs; ++i) {
+ const arch_register_t *reg = &chordal_env->cls->regs[i];
+ if(arch_register_type_is(reg, ignore))
+ bitset_set(env.ignore_colors, reg->index);
+ }
+#endif
+
+ /* Handle register targeting constraints */
+ dom_tree_walk_irg(irg, constraints, NULL, &env);
+
+ {
+ char buf[128];
+ snprintf(buf, sizeof(buf), "-%s-constr", chordal_env->cls->name);
+ dump_ir_block_graph_sched(chordal_env->irg, buf);
+ }
+
+ be_numbering(irg);
+ env.live = bitset_malloc(get_graph_node_count(chordal_env->irg));
/* First, determine the pressure */
dom_tree_walk_irg(irg, pressure, NULL, &env);
/* Assign the colors */
dom_tree_walk_irg(irg, assign, NULL, &env);
+ be_numbering_done(irg);
+
#ifdef DUMP_INTERVALS
{
char buf[128];
plotter_t *plotter;
- ir_snprintf(buf, sizeof(buf), "ifg_%s_%F.eps", cls->name, irg);
+ ir_snprintf(buf, sizeof(buf), "ifg_%s_%F.eps", chordal_env->cls->name, irg);
plotter = new_plotter_ps(buf);
- draw_interval_tree(&draw_chordal_def_opts, chordal_env, plotter, env->arch_env, cls);
+ draw_interval_tree(&draw_chordal_def_opts, chordal_env, plotter);
plotter_free(plotter);
}
#endif
- obstack_free(&chordal_env->obst, base);
+ free(env.live);
+ free(env.colors);
+ free(env.in_colors);
+ free(env.ignore_colors);
+
+ del_pset(env.pre_colored);
}
projects / libfirm / blobdiff