/**
* Chordal register allocation.
* @author Sebastian Hack
- * @date 8.12.2004
+ * @date 8.12.2004
+ * @cvs-id $Id$
+ *
+ * Copyright (C) Universitaet Karlsruhe
+ * Released under the GPL
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#include <ctype.h>
#include "obst.h"
+#include "pset.h"
#include "list.h"
#include "bitset.h"
+#include "raw_bitset.h"
#include "iterator.h"
+#include "bipartite.h"
+#include "hungarian.h"
#include "irmode_t.h"
#include "irgraph_t.h"
#include "irgwalk.h"
#include "irdump.h"
#include "irdom.h"
+#include "irtools.h"
#include "debug.h"
#include "xmalloc.h"
#include "beutil.h"
#include "besched.h"
-#include "bera_t.h"
-#include "benumb_t.h"
#include "besched_t.h"
#include "belive_t.h"
+#include "benode_t.h"
+#include "bearch.h"
+#include "beirgmod.h"
+#include "beifg.h"
+#include "beinsn_t.h"
+#include "bestatevent.h"
+#include "beirg_t.h"
+
#include "bechordal_t.h"
+#include "bechordal_draw.h"
+DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
+#define NO_COLOR (-1)
-#undef DUMP_INTERVALS
-#undef DUMP_PRESSURE
-#define DUMP_IFG
+#define DUMP_INTERVALS
-#define BUILD_GRAPH
+typedef struct _be_chordal_alloc_env_t {
+ be_chordal_env_t *chordal_env;
-#ifdef USE_OLD_PHI_INTERFERENCE
-#undef BUILD_GRAPH
-#define BUILD_GRAPH
-#endif
+ pset *pre_colored; /**< Set of precolored nodes. */
+ bitset_t *live; /**< A liveness bitset. */
+ bitset_t *tmp_colors; /**< An auxiliary bitset which is as long as the number of colors in the class. */
+ bitset_t *colors; /**< The color mask. */
+ bitset_t *in_colors; /**< Colors used by live in values. */
+ int colors_n; /**< The number of colors. */
+} be_chordal_alloc_env_t;
-#ifdef DEBUG_libfirm
#include "fourcc.h"
/* Make a fourcc for border checking. */
#define BORDER_FOURCC FOURCC('B', 'O', 'R', 'D')
-#endif /* DEBUG_libfirm */
-
-#define TEST_COLORS 2048
-
-static firm_dbg_module_t *dbg;
-
-/**
- * Environment for each of the chordal register allocator phases
- */
-typedef struct _env_t {
- struct obstack obst; /**< An obstack for temporary storage. */
-#ifdef BUILD_GRAPH
- set *graph; /**< The interference graph. */
-#endif
-
- bitset_t *live; /**< A liveness bitset. */
- bitset_t *colors; /**< The color mask. */
- bitset_t *in_colors; /**< Colors used by live in values. */
- int colors_n; /**< The number of colors. */
-} env_t;
-
-
-typedef struct _be_chordal_dump_params_t {
- int x_dist;
- int y_dist;
- double font_scale;
-} be_chordal_dump_params_t;
-
-static const be_chordal_dump_params_t dump_params = {
- 30,
- 10,
- 4
-};
-
-static void draw_interval_graphs(ir_node *block,
- struct list_head *border_head,
- const be_chordal_dump_params_t *params)
-{
- int i;
- int x_dist = params->x_dist;
- int y_dist = params->y_dist;
- ir_graph *irg = get_irn_irg(block);
-
- FILE *f;
- char buf[1024];
-
- ir_snprintf(buf, sizeof(buf), "intv_%s_bl%N.eps",
- get_entity_name(get_irg_entity(irg)), block);
-
- if((f = fopen(buf, "wt")) != NULL) {
- border_t *b;
- int *seen = xcalloc(get_graph_node_count(irg), sizeof(seen[0]));
- int last_pos = list_empty(border_head) ? 0 : list_entry(border_head->prev, border_t, list)->step;
- int max_col = 0;
-
- list_for_each_entry_reverse(border_t, b, border_head, list) {
- const ir_node *irn = b->irn;
- int col = get_irn_color(irn);
- max_col = max_col > col ? max_col : col;
- }
-
- fprintf(f, "%%!PS-Adobe-2.0\n");
- fprintf(f, "%%%%BoundingBox: -10 -10 %d %d\n",
- x_dist * last_pos + x_dist, y_dist * max_col + y_dist);
- fprintf(f, "/mainfont /Courier findfont %f scalefont def\n", params->font_scale);
- fprintf(f, "mainfont setfont\n");
- fprintf(f, "0.2 setlinewidth\n");
-
- for(i = 0; i <= last_pos; ++i) {
- fprintf(f, "0 0 0 setrgbcolor\n");
- fprintf(f, "%d %d moveto\n", i * x_dist, -2);
- fprintf(f, "%d %d lineto\n", i * x_dist, max_col * y_dist + 2);
- fprintf(f, "stroke\n");
- }
- fprintf(f, "0.5 setlinewidth\n");
-
- list_for_each_entry_reverse(border_t, b, border_head, list) {
- const ir_node *irn = b->irn;
- int nr = get_irn_graph_nr(irn);
-
- if(b->is_def)
- seen[nr] = b->step;
- else {
- int col = get_irn_color(irn);
-
- int pos = last_pos - seen[nr];
- int end_pos = last_pos - b->step;
- int live_in = is_live_in(block, irn);
- int live_end = is_live_end(block, irn);
- int y_val = y_dist * col;
-
- int red = 0;
- int green = live_end;
- int blue = live_in;
-
- fprintf(f, "0 0 0 setrgbcolor\n");
- fprintf(f, "%d %d moveto\n", x_dist * pos + 2, y_val + 2);
- ir_fprintf(f, "(%n/%d%s) show\n", irn, nr, is_phi_operand(irn) ? "*" : "");
- fprintf(f, "%d %d %d setrgbcolor\n", red, green, blue);
- fprintf(f, "%d %d moveto\n", x_dist * pos, y_val);
- fprintf(f, "%d %d lineto\n", (x_dist * end_pos) - 5, y_val);
- fprintf(f, "stroke\n");
- }
- }
-
- free(seen);
- fclose(f);
- }
-}
-
-#ifdef BUILD_GRAPH
-
-typedef struct _if_edge_t {
- int src, tgt;
-} if_edge_t;
-
-#define IF_EDGE_HASH(e) ((e)->src)
-
-static int if_edge_cmp(const void *p1, const void *p2, size_t size)
-{
- const if_edge_t *e1 = p1;
- const if_edge_t *e2 = p2;
-
- return !(e1->src == e2->src && e1->tgt == e2->tgt);
-}
-
-static INLINE if_edge_t *edge_init(if_edge_t *edge, int src, int tgt)
-{
- /* Bring the smaller entry to src. */
- if(src > tgt) {
- edge->src = tgt;
- edge->tgt = src;
- } else {
- edge->src = src;
- edge->tgt = tgt;
- }
-
- return edge;
-}
-
-static INLINE void add_if(const env_t *env, int src, int tgt)
+#if 0
+static void check_border_list(struct list_head *head)
{
- if_edge_t edge;
- edge_init(&edge, src, tgt);
- set_insert(env->graph, &edge, sizeof(edge), IF_EDGE_HASH(&edge));
+ border_t *x;
+ list_for_each_entry(border_t, x, head, list) {
+ assert(x->magic == BORDER_FOURCC);
+ }
}
-static INLINE int are_connected(const env_t *env, int src, int tgt)
+static void check_heads(be_chordal_env_t *env)
{
- if_edge_t edge;
- edge_init(&edge, src, tgt);
- return set_find(env->graph, &edge, sizeof(edge), IF_EDGE_HASH(&edge)) != NULL;
+ pmap_entry *ent;
+ for(ent = pmap_first(env->border_heads); ent; ent = pmap_next(env->border_heads)) {
+ /* ir_printf("checking border list of block %+F\n", ent->key); */
+ check_border_list(ent->value);
+ }
}
-
-static void dump_ifg(set *edges, const char *filename)
-{
- FILE *f;
-
- if((f = fopen(filename, "wt")) != NULL) {
- if_edge_t *edge;
-
- fprintf(f, "graph G {\n");
-
- for(edge = set_first(edges); edge; edge = set_next(edges)) {
- fprintf(f, "i\tn%d -- n%d\n", edge->src, edge->tgt);
- }
-
- fprintf(f, "}\n");
- fclose(f);
- }
-
-}
-
-#endif /* BUILD_GRAPH */
+#endif
/**
* Add an interval border to the list of a block's list
* @param is_def Is the border a use or a def.
* @return The created border.
*/
-static INLINE border_t *border_add(env_t *env, struct list_head *head,
+static INLINE border_t *border_add(be_chordal_env_t *env, struct list_head *head,
ir_node *irn, unsigned step, unsigned pressure,
unsigned is_def, unsigned is_real)
{
/* also allocate the def and tie it to the use. */
def = obstack_alloc(&env->obst, sizeof(*def));
+ memset(def, 0, sizeof(*def));
b->other_end = def;
def->other_end = b;
*/
set_irn_link(irn, def);
-#ifdef DEBUG_libfirm
- b->magic = BORDER_FOURCC;
- def->magic = BORDER_FOURCC;
-#endif
+ DEBUG_ONLY(b->magic = BORDER_FOURCC);
+ DEBUG_ONLY(def->magic = BORDER_FOURCC);
}
/*
else {
b = get_irn_link(irn);
-#ifdef DEBUG_libfirm
assert(b && b->magic == BORDER_FOURCC && "Illegal border encountered");
-#endif
}
-
+ b->pressure = pressure;
b->is_def = is_def;
b->is_real = is_real;
b->irn = irn;
b->step = step;
list_add_tail(&b->list, head);
- DBG((dbg, LEVEL_5, "\t\t%s adding %n, step: %d\n",
- is_def ? "def" : "use", irn, step));
+ DBG((env->dbg, LEVEL_5, "\t\t%s adding %+F, step: %d\n", is_def ? "def" : "use", irn, step));
+
return b;
}
+/**
+ * Check, if an irn is of the register class currently under processing.
+ * @param env The chordal environment.
+ * @param irn The node.
+ * @return 1, if the node is of that register class, 0 if not.
+ */
+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);
+}
+
+#define has_limited_constr(req, irn) \
+ (arch_get_register_req(arch_env, (req), irn, -1) && (req)->type == arch_register_req_type_limited)
+
+static int get_next_free_reg(const be_chordal_alloc_env_t *alloc_env, bitset_t *colors)
+{
+ bitset_t *tmp = alloc_env->tmp_colors;
+ bitset_copy(tmp, colors);
+ bitset_or(tmp, alloc_env->chordal_env->ignore_colors);
+ return bitset_next_clear(tmp, 0);
+}
+
+static bitset_t *get_decisive_partner_regs(bitset_t *bs, const be_operand_t *o1, const be_operand_t *o2)
+{
+ bitset_t *res = bs;
+
+ if(!o1) {
+ bitset_copy(bs, o2->regs);
+ return bs;
+ }
+
+ if(!o2) {
+ bitset_copy(bs, o1->regs);
+ return bs;
+ }
+
+ assert(o1->req->cls == o2->req->cls || ! o1->req->cls || ! o2->req->cls);
+
+ if(bitset_contains(o1->regs, o2->regs))
+ bitset_copy(bs, o1->regs);
+ else if(bitset_contains(o2->regs, o1->regs))
+ bitset_copy(bs, o2->regs);
+ else
+ res = NULL;
+
+ return res;
+}
+
+static be_insn_t *chordal_scan_insn(be_chordal_env_t *env, ir_node *irn)
+{
+ be_insn_env_t ie;
+
+ ie.ignore_colors = env->ignore_colors;
+ ie.aenv = env->birg->main_env->arch_env;
+ ie.obst = &env->obst;
+ ie.cls = env->cls;
+ return be_scan_insn(&ie, 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;
+ 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);
+ be_lv_t *lv = env->birg->lv;
+
+ be_insn_t *insn;
+ int i, j;
+
+ for (i = get_irn_arity(irn) - 1; i >= 0; --i) {
+ ir_node *op = get_irn_n(irn, i);
+ ir_node *copy;
+ const arch_register_t *reg;
+ const arch_register_req_t *req;
+
+ if (arch_get_irn_reg_class(aenv, irn, i) != env->cls)
+ continue;
+
+ reg = arch_get_irn_register(aenv, op);
+
+ if (reg == NULL || !arch_register_type_is(reg, ignore))
+ continue;
+ if(arch_register_type_is(reg, joker))
+ continue;
+
+ req = arch_get_register_req(aenv, irn, i);
+ if (!arch_register_req_is(req, limited))
+ continue;
+
+ if (rbitset_is_set(req->limited, reg->index))
+ continue;
+
+ copy = be_new_Copy(env->cls, env->irg, bl, op);
+ be_stat_ev("constr_copy", 1);
+
+ sched_add_before(irn, copy);
+ set_irn_n(irn, i, copy);
+ DBG((env->dbg, LEVEL_3, "inserting ignore arg copy %+F for %+F pos %d\n", copy, irn, i));
+ }
+
+ insn = chordal_scan_insn(env, irn);
+
+ if(!insn->has_constraints)
+ goto end;
+
+ /* insert copies for nodes that occur constrained more than once. */
+ for(i = insn->use_start; i < insn->n_ops; ++i) {
+ be_operand_t *op = &insn->ops[i];
+
+ if(!op->has_constraints)
+ continue;
+
+ for(j = i + 1; j < insn->n_ops; ++j) {
+ ir_node *copy;
+ be_operand_t *a_op = &insn->ops[j];
+
+ if(a_op->carrier != op->carrier || !a_op->has_constraints)
+ continue;
+
+ copy = be_new_Copy(env->cls, env->irg, bl, op->carrier);
+ be_stat_ev("constr_copy", 1);
+
+ sched_add_before(insn->irn, copy);
+ set_irn_n(insn->irn, a_op->pos, copy);
+ DBG((env->dbg, LEVEL_3, "inserting multiple constr copy %+F for %+F pos %d\n", copy, insn->irn, a_op->pos));
+ }
+ }
+
+ /* collect all registers occuring in out constraints. */
+ for(i = 0; i < insn->use_start; ++i) {
+ be_operand_t *op = &insn->ops[i];
+ if(op->has_constraints)
+ bitset_or(def_constr, op->regs);
+ }
+
+ /*
+ insert copies for all constrained arguments living through the node
+ and being constrained to a register which also occurs in out constraints.
+ */
+ for(i = insn->use_start; i < insn->n_ops; ++i) {
+ ir_node *copy;
+ be_operand_t *op = &insn->ops[i];
+
+ bitset_copy(tmp, op->regs);
+ bitset_and(tmp, def_constr);
+
+ /*
+ Check, if
+ 1) the operand is constrained.
+ 2) lives through the node.
+ 3) is constrained to a register occuring in out constraints.
+ */
+ if(!op->has_constraints ||
+ !values_interfere(lv, insn->irn, op->carrier) ||
+ bitset_popcnt(tmp) == 0)
+ continue;
+
+ /*
+ only create the copy if the operand is no copy.
+ this is necessary since the assure constraints phase inserts
+ Copies and Keeps for operands which must be different from the results.
+ Additional copies here would destroy this.
+ */
+ if(be_is_Copy(op->carrier))
+ continue;
+
+ copy = be_new_Copy(env->cls, env->irg, bl, op->carrier);
+
+ sched_add_before(insn->irn, copy);
+ set_irn_n(insn->irn, op->pos, copy);
+ DBG((env->dbg, LEVEL_3, "inserting constr copy %+F for %+F pos %d\n", copy, insn->irn, op->pos));
+ be_liveness_update(lv, op->carrier);
+ }
+
+end:
+ obstack_free(&env->obst, insn);
+ return insn->next_insn;
+}
+
+static void pre_spill_prepare_constr_walker(ir_node *bl, void *data)
+{
+ be_chordal_env_t *env = data;
+ ir_node *irn;
+ for(irn = sched_first(bl); !sched_is_end(irn);) {
+ irn = prepare_constr_insn(env, irn);
+ }
+}
+
+void be_pre_spill_prepare_constr(be_chordal_env_t *cenv) {
+ irg_block_walk_graph(cenv->irg, pre_spill_prepare_constr_walker, NULL, (void *) cenv);
+}
+
+static void pair_up_operands(const be_chordal_alloc_env_t *alloc_env, be_insn_t *insn)
+{
+ const be_chordal_env_t *env = alloc_env->chordal_env;
+
+ int n_uses = be_insn_n_uses(insn);
+ 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;
+
+ /*
+ For each out operand, try to find an in operand which can be assigned the
+ same register as the out operand.
+ */
+ for (j = 0; j < insn->use_start; ++j) {
+ int smallest = -1;
+ int smallest_n_regs = 2 * env->cls->n_regs + 1;
+ be_operand_t *out_op = &insn->ops[j];
+
+ /* Try to find an in operand which has ... */
+ for(i = insn->use_start; i < insn->n_ops; ++i) {
+ int n_total;
+ const be_operand_t *op = &insn->ops[i];
+
+ if (op->partner != NULL)
+ continue;
+ if (values_interfere(lv, op->irn, op->carrier))
+ continue;
+
+ bitset_clear_all(bs);
+ bitset_copy(bs, op->regs);
+ bitset_and(bs, out_op->regs);
+ n_total = bitset_popcnt(op->regs) + bitset_popcnt(out_op->regs);
+
+ if (bitset_popcnt(bs) > 0 && n_total < smallest_n_regs) {
+ smallest = i;
+ smallest_n_regs = n_total;
+ }
+ }
+
+ if (smallest >= 0) {
+ be_operand_t *partner = &insn->ops[smallest];
+ out_op->partner = partner;
+ partner->partner = out_op;
+ }
+ }
+}
+
+
+static ir_node *pre_process_constraints(be_chordal_alloc_env_t *alloc_env,
+ be_insn_t **the_insn)
+{
+ be_chordal_env_t *env = alloc_env->chordal_env;
+ const arch_env_t *aenv = env->birg->main_env->arch_env;
+ be_insn_t *insn = *the_insn;
+ ir_node *perm = NULL;
+ bitset_t *out_constr = bitset_alloca(env->cls->n_regs);
+ const ir_edge_t *edge;
+ int i;
+
+ assert(insn->has_constraints && "only do this for constrained nodes");
+
+ /*
+ Collect all registers that occur in output constraints.
+ This is necessary, since if the insn has one of these as an input constraint
+ and the corresponding operand interferes with the insn, the operand must
+ be copied.
+ */
+ for(i = 0; i < insn->use_start; ++i) {
+ be_operand_t *op = &insn->ops[i];
+ if(op->has_constraints)
+ bitset_or(out_constr, op->regs);
+ }
+
+ /*
+ Make the Perm, recompute liveness and re-scan the insn since the
+ in operands are now the Projs of the Perm.
+ */
+ perm = insert_Perm_after(env->birg, env->cls, sched_prev(insn->irn));
+
+ /* Registers are propagated by insert_Perm_after(). Clean them here! */
+ if(perm == NULL)
+ return NULL;
+
+ be_stat_ev("constr_perm", get_irn_arity(perm));
+ foreach_out_edge(perm, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+ arch_set_irn_register(aenv, proj, NULL);
+ }
+
+ /*
+ We also have to re-build the insn since the input operands are now the Projs of
+ the Perm. Recomputing liveness is also a good idea if a Perm is inserted, since
+ the live sets may change.
+ */
+ // be_liveness_recompute(lv);
+ obstack_free(&env->obst, insn);
+ *the_insn = insn = chordal_scan_insn(env, insn->irn);
+
+ /*
+ Copy the input constraints of the insn to the Perm as output
+ constraints. Succeeding phases (coalescing) will need that.
+ */
+ for(i = insn->use_start; i < insn->n_ops; ++i) {
+ be_operand_t *op = &insn->ops[i];
+ ir_node *proj = op->carrier;
+ /*
+ Note that the predecessor must not be a Proj of the Perm,
+ since ignore-nodes are not Perm'ed.
+ */
+ if(op->has_constraints && is_Proj(proj) && get_Proj_pred(proj) == perm) {
+ be_set_constr_limited(perm, BE_OUT_POS(get_Proj_proj(proj)), op->req);
+ }
+ }
+
+ return perm;
+}
+
+static ir_node *handle_constraints(be_chordal_alloc_env_t *alloc_env, ir_node *irn, int *silent)
+{
+ const arch_env_t *aenv;
+ int n_regs;
+ bitset_t *bs;
+ ir_node **alloc_nodes;
+ hungarian_problem_t *bp;
+ int *assignment;
+ pmap *partners;
+ int i, n_alloc;
+ long col;
+ const ir_edge_t *edge;
+ ir_node *perm = NULL;
+ int match_res, cost;
+ be_chordal_env_t *env = alloc_env->chordal_env;
+ void *base = obstack_base(&env->obst);
+ 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;
+
+ if(insn->pre_colored) {
+ int i;
+ for(i = 0; i < insn->use_start; ++i)
+ pset_insert_ptr(alloc_env->pre_colored, insn->ops[i].carrier);
+ }
+
+ /*
+ If the current node is a barrier toggle the silent flag.
+ If we are in the start block, we are ought to be silent at the beginning,
+ so the toggling activates the constraint handling but skips the barrier.
+ If we are in the end block we handle the in requirements of the barrier
+ and set the rest to silent.
+ */
+ if(be_is_Barrier(irn))
+ *silent = !*silent;
+
+ if(be_silent)
+ goto end;
+
+ /*
+ Perms inserted before the constraint handling phase are considered to be
+ correctly precolored. These Perms arise during the ABI handling phase.
+ */
+ if(!insn->has_constraints)
+ goto end;
+
+ aenv = env->birg->main_env->arch_env;
+ n_regs = env->cls->n_regs;
+ bs = bitset_alloca(n_regs);
+ alloc_nodes = alloca(n_regs * sizeof(alloc_nodes[0]));
+ bp = hungarian_new(n_regs, n_regs, 2, HUNGARIAN_MATCH_PERFECT);
+ // bipartite_t *bp = bipartite_new(n_regs, n_regs);
+ assignment = alloca(n_regs * sizeof(assignment[0]));
+ partners = pmap_create();
+
+ /*
+ prepare the constraint handling of this node.
+ Perms are constructed and Copies are created for constrained values
+ interfering with the instruction.
+ */
+ perm = pre_process_constraints(alloc_env, &insn);
+
+ /* find suitable in operands to the out operands of the node. */
+ pair_up_operands(alloc_env, insn);
+
+ /*
+ look at the in/out operands and add each operand (and its possible partner)
+ to a bipartite graph (left: nodes with partners, right: admissible colors).
+ */
+ for(i = 0, n_alloc = 0; i < insn->n_ops; ++i) {
+ be_operand_t *op = &insn->ops[i];
+
+ /*
+ If the operand has no partner or the partner has not been marked
+ for allocation, determine the admissible registers and mark it
+ for allocation by associating the node and its partner with the
+ set of admissible registers via a bipartite graph.
+ */
+ if(!op->partner || !pmap_contains(partners, op->partner->carrier)) {
+
+ 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, op->partner ? op->partner->carrier : NULL));
+
+ bitset_clear_all(bs);
+ get_decisive_partner_regs(bs, op, op->partner);
+
+ DBG((dbg, LEVEL_2, "\tallowed registers for %+F: %B\n", op->carrier, bs));
+
+ bitset_foreach(bs, col) {
+ hungarian_add(bp, n_alloc, col, 1);
+ // bipartite_add(bp, n_alloc, col);
+ }
+
+ n_alloc++;
+ }
+ }
+
+ /*
+ Put all nodes which live through the constrained instruction also to the
+ allocation bipartite graph. They are considered unconstrained.
+ */
+ if(perm != NULL) {
+ foreach_out_edge(perm, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+
+ assert(is_Proj(proj));
+
+ if(!values_interfere(lv, proj, irn) || pmap_contains(partners, proj))
+ continue;
+
+ assert(n_alloc < n_regs);
+ alloc_nodes[n_alloc] = proj;
+ pmap_insert(partners, proj, NULL);
+
+ bitset_clear_all(bs);
+ arch_put_non_ignore_regs(aenv, env->cls, bs);
+ bitset_andnot(bs, env->ignore_colors);
+ bitset_foreach(bs, col) {
+ hungarian_add(bp, n_alloc, col, 1);
+ // bipartite_add(bp, n_alloc, col);
+ }
+
+ n_alloc++;
+ }
+ }
+
+ /* Compute a valid register allocation. */
+ hungarian_prepare_cost_matrix(bp, HUNGARIAN_MODE_MAXIMIZE_UTIL);
+ match_res = hungarian_solve(bp, assignment, &cost, 1);
+ assert(match_res == 0 && "matching failed");
+ //bipartite_matching(bp, assignment);
+
+ /* Assign colors obtained from the matching. */
+ for(i = 0; i < n_alloc; ++i) {
+ const arch_register_t *reg;
+ ir_node *nodes[2];
+ int j;
+
+ assert(assignment[i] >= 0 && "there must have been a register assigned");
+ 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);
+ (void) pset_hinsert_ptr(alloc_env->pre_colored, nodes[j]);
+ DBG((dbg, LEVEL_2, "\tsetting %+F to register %s\n", nodes[j], reg->name));
+ }
+ }
+
+ /* Allocate the non-constrained Projs of the Perm. */
+ if(perm != NULL) {
+ bitset_clear_all(bs);
+
+ /* Put the colors of all Projs in a bitset. */
+ 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);
+ }
+
+ /* Assign the not yet assigned Projs of the Perm a suitable color. */
+ 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 = get_next_free_reg(alloc_env, bs);
+ 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));
+ }
+ }
+ }
+
+ //bipartite_free(bp);
+ hungarian_free(bp);
+ pmap_destroy(partners);
+
+end:
+ obstack_free(&env->obst, base);
+ return res;
+}
+
+/**
+ * Handle constraint nodes in each basic block.
+ * handle_constraints() 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().
+ */
+static void constraints(ir_node *bl, void *data)
+{
+ be_chordal_alloc_env_t *env = data;
+
+ /*
+ Start silent in the start block.
+ The silence remains until the first barrier is seen.
+ Each other block is begun loud.
+ */
+ int silent = bl == get_irg_start_block(get_irn_irg(bl));
+ ir_node *irn;
+
+ /*
+ If the block is the start block search the barrier and
+ start handling constraints from there.
+ */
+
+ for(irn = sched_first(bl); !sched_is_end(irn);) {
+ irn = handle_constraints(env, irn, &silent);
+ }
+}
+
/**
* Annotate the register pressure to the nodes and compute
* the liveness intervals.
#define border_use(irn, step, real) \
border_add(env, head, irn, step, ++pressure, 0, real)
- env_t *env = env_ptr;
- bitset_t *live = env->live;
+ be_chordal_alloc_env_t *alloc_env = env_ptr;
+ be_chordal_env_t *env = alloc_env->chordal_env;
+ bitset_t *live = alloc_env->live;
ir_node *irn;
+ be_lv_t *lv = env->birg->lv;
int i, n;
unsigned step = 0;
unsigned pressure = 0;
struct list_head *head;
- pset *live_in = get_live_in(block);
- pset *live_end = get_live_end(block);
+ 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 %n\n", block));
+ DBG((dbg, LEVEL_1, "Computing pressure in block %+F\n", block));
bitset_clear_all(live);
/* Set up the border list in the block info */
- head = &get_ra_block_info(block)->border_head;
+ head = obstack_alloc(&env->obst, sizeof(*head));
INIT_LIST_HEAD(head);
+ assert(pmap_get(env->border_heads, block) == NULL);
+ pmap_insert(env->border_heads, block, head);
/*
* Make final uses of all values live out of the block.
- * They are neccessary to build up real intervals.
+ * They are necessary to build up real intervals.
*/
- for(irn = pset_first(live_end); irn; irn = pset_next(live_end)) {
- DBG((dbg, LEVEL_3, "\tMaking live: %n/%d\n", irn, get_irn_graph_nr(irn)));
- bitset_set(live, get_irn_graph_nr(irn));
- if(is_allocatable_irn(irn))
+ foreach_pset(live_end, irn) {
+ 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));
border_use(irn, step, 0);
+ }
}
-
++step;
/*
* relevant for the interval borders.
*/
sched_foreach_reverse(block, irn) {
- DBG((dbg, LEVEL_1, "\tinsn: %n, pressure: %d\n", irn, pressure));
- DBG((dbg, LEVEL_2, "\tlive: %b\n", live));
-
- /* Erase the color of each node encountered. */
- set_irn_color(irn, NO_COLOR);
+ DBG((dbg, LEVEL_1, "\tinsn: %+F, pressure: %d\n", irn, pressure));
+ DBG((dbg, LEVEL_2, "\tlive: %B\n", live));
/*
- * If the node defines a datab value, i.e. something, registers must
- * be allocated for, add a new def border to the border list.
+ * If the node defines some value, which can put into a
+ * register of the current class, make a border for it.
*/
- if(is_allocatable_irn(irn)) {
- int nr = get_irn_graph_nr(irn);
+ if(has_reg_class(env, irn)) {
+ int nr = get_irn_idx(irn);
bitset_clear(live, nr);
border_def(irn, step, 1);
-
-#ifdef BUILD_GRAPH
- {
- unsigned long elm;
- bitset_foreach(live, elm) {
- int live_nr = (int) elm;
- add_if(env, nr, live_nr);
- }
- }
-#endif
}
/*
for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
ir_node *op = get_irn_n(irn, i);
- if(is_allocatable_irn(op)) {
- int nr = get_irn_graph_nr(op);
-
- DBG((dbg, LEVEL_4, "\t\tpos: %d, use: %n\n", i, op));
+ if(has_reg_class(env, op)) {
+ int nr = get_irn_idx(op);
+ const char *msg = "-";
if(!bitset_is_set(live, nr)) {
border_use(op, step, 1);
bitset_set(live, nr);
+ msg = "X";
}
+
+ DBG((dbg, LEVEL_4, "\t\t%s pos: %d, use: %+F\n", msg, i, op));
}
}
}
-
++step;
}
/*
* Add initial defs for all values live in.
*/
- for(irn = pset_first(live_in); irn; irn = pset_next(live_in)) {
- if(is_allocatable_irn(irn)) {
+ foreach_pset(live_in, irn) {
+ if(has_reg_class(env, irn)) {
/* Mark the value live in. */
- bitset_set(live, get_irn_graph_nr(irn));
+ bitset_set(live, get_irn_idx(irn));
/* Add the def */
border_def(irn, step, 0);
}
}
+
+ del_pset(live_in);
+ del_pset(live_end);
}
static void assign(ir_node *block, void *env_ptr)
{
- env_t *env = env_ptr;
- struct obstack *obst = &env->obst;
- bitset_t *live = env->live;
- bitset_t *colors = env->colors;
- bitset_t *in_colors = env->in_colors;
-
- /* The used colors will remain on the obstack. */
- bitset_t *used_colors = bitset_obstack_alloc(obst, env->colors_n);
-
- /* Mark the obstack level and allocate the temporary tmp_colors */
- void *obstack_level = obstack_base(obst);
- bitset_t *tmp_colors = bitset_obstack_alloc(obst, env->colors_n);
+ be_chordal_alloc_env_t *alloc_env = env_ptr;
+ be_chordal_env_t *env = alloc_env->chordal_env;
+ bitset_t *live = alloc_env->live;
+ bitset_t *colors = alloc_env->colors;
+ bitset_t *in_colors = alloc_env->in_colors;
+ const arch_env_t *arch_env = env->birg->main_env->arch_env;
+ struct list_head *head = get_block_border_head(env, block);
+ be_lv_t *lv = env->birg->lv;
+ pset *live_in = be_lv_pset_put_in(lv, block, pset_new_ptr_default());
const ir_node *irn;
border_t *b;
- struct list_head *head = &get_ra_block_info(block)->border_head;
- pset *live_in = get_live_in(block);
- bitset_clear_all(live);
bitset_clear_all(colors);
+ bitset_clear_all(live);
bitset_clear_all(in_colors);
- DBG((dbg, LEVEL_4, "Assigning colors for block %n\n", block));
+ DBG((dbg, LEVEL_4, "Assigning colors for block %+F\n", block));
DBG((dbg, LEVEL_4, "\tusedef chain for block\n"));
list_for_each_entry(border_t, b, head, list) {
- DBG((dbg, LEVEL_4, "\t%s %n/%d\n", b->is_def ? "def" : "use",
- b->irn, get_irn_graph_nr(b->irn)));
+ DBG((dbg, LEVEL_4, "\t%s %+F/%d\n", b->is_def ? "def" : "use",
+ b->irn, get_irn_idx(b->irn)));
}
/*
* Since their colors have already been assigned (The dominators were
* allocated before), we have to mark their colors as used also.
*/
- for(irn = pset_first(live_in); irn; irn = pset_next(live_in)) {
- if(is_allocatable_irn(irn)) {
- int col = get_irn_color(irn);
+ foreach_pset(live_in, irn) {
+ if(has_reg_class(env, irn)) {
+ const arch_register_t *reg = arch_get_irn_register(arch_env, irn);
+ int col;
+
+ 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. */
- assert(is_color(col) && "Node must have been assigned a color.");
bitset_set(colors, col);
bitset_set(in_colors, col);
- bitset_set(used_colors, col);
/* Mark the value live in. */
- bitset_set(live, get_irn_graph_nr(irn));
+ bitset_set(live, get_irn_idx(irn));
}
}
* will work.
*/
list_for_each_entry_reverse(border_t, b, head, list) {
- const ir_node *irn = b->irn;
- int nr = get_irn_graph_nr(irn);
+ ir_node *irn = b->irn;
+ int nr = get_irn_idx(irn);
+ int ignore = arch_irn_is(arch_env, irn, ignore);
/*
* Assign a color, if it is a local def. Global defs already have a
* color.
*/
- if(b->is_def && !is_live_in(block, irn)) {
- ra_node_info_t *ri = get_ra_node_info(irn);
+ if(b->is_def && !be_is_live_in(lv, block, irn)) {
+ const arch_register_t *reg;
int col = NO_COLOR;
- DBG((dbg, LEVEL_4, "\tcolors in use: %b\n", colors));
-
- /*
- * Try to assign live out values colors which are not used by live
- * in values.
- */
-#if 0
- if(is_live_out(block, irn)) {
- int next_clear;
-
- bitset_copy(tmp_colors, colors);
- bitset_or(tmp_colors, in_colors);
- next_clear = bitset_next_clear(tmp_colors, 0);
- col = next_clear != -1 ? next_clear : NO_COLOR;
-
- DBG((dbg, LEVEL_5, "next clear in only outs %b: %d\n", tmp_colors, col));
+ 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");
}
-#endif
-
- /* If a color is not yet assigned, do it now. */
- if(!is_color(col))
- col = bitset_next_clear(colors, 0);
-
- assert(!is_color(get_irn_color(irn)) && "Color must not have assigned");
- assert(!bitset_is_set(live, nr) && "Value def must not have been encountered");
bitset_set(colors, col);
- bitset_set(used_colors, col);
- bitset_set(live, nr);
+ arch_set_irn_register(arch_env, irn, reg);
- ri->color = col;
+ DBG((dbg, LEVEL_1, "\tassigning register %s(%d) to %+F\n", arch_register_get_name(reg), col, irn));
- DBG((dbg, LEVEL_1, "\tassigning color %d to %n\n", 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. */
else if(!b->is_def) {
- int col = get_irn_color(irn);
+ const arch_register_t *reg = arch_get_irn_register(arch_env, irn);
+ int col;
- assert(bitset_is_set(live, nr) && "Cannot have a non live use");
- assert(is_color(col) && "A color must have been assigned");
+ assert(reg && "Register must have been assigned");
- bitset_clear(colors, col);
- bitset_clear(live, nr);
- }
- }
-
-#ifdef DUMP_INTERVALS
- draw_interval_graphs(block, head, &dump_params);
+ col = arch_register_get_index(reg);
+#ifndef NDEBUG
+ if(!arch_register_type_is(reg, ignore)) {
+ assert(bitset_is_set(live, nr) && "Cannot have a non live use");
+ }
#endif
-#ifdef DUMP_PRESSURE
- {
- char buf[128];
- FILE *f;
-
- ir_snprintf(buf, sizeof(buf), "pres_%s_bl_%N.txt",
- get_entity_name(get_irg_entity(irg)), block);
-
- if((f = fopen(buf, "wt")) != NULL) {
- sched_foreach_reverse(block, irn) {
- if(is_allocatable_irn(irn))
- ir_fprintf(f, "\"%n\" %d %d\n", irn, sched_get_time_step(irn),
- get_ra_node_info(irn)->pressure);
-
- }
- fclose(f);
+ bitset_clear(colors, col);
+ bitset_clear(live, nr);
}
}
-#endif
-
-
- /*
- * Allocate the used colors array in the blocks ra info structure and
- * fill it.
- */
- get_ra_block_info(block)->used_colors = used_colors;
-
- /* Free the auxillary data on the obstack. */
- obstack_free(obst, obstack_level);
-}
-void be_ra_chordal_init(void)
-{
- dbg = firm_dbg_register(DBG_BERA);
- /* firm_dbg_set_mask(dbg, -1); */
+ del_pset(live_in);
}
-void be_ra_chordal(ir_graph *irg)
+void be_ra_chordal_color(be_chordal_env_t *chordal_env)
{
- int node_count = get_graph_node_count(irg);
- env_t *env = malloc(sizeof(*env));
-
- if(get_irg_dom_state(irg) != dom_consistent)
- compute_doms(irg);
-
- obstack_init(&env->obst);
-
-#ifdef BUILD_GRAPH
- env->graph = new_set(if_edge_cmp, node_count);
-#endif
+ be_chordal_alloc_env_t env;
+ char buf[256];
+ be_irg_t *birg = chordal_env->birg;
+ const arch_register_class_t *cls = chordal_env->cls;
+
+ int colors_n = arch_register_class_n_regs(cls);
+ ir_graph *irg = chordal_env->irg;
+ int allocatable_regs = colors_n - be_put_ignore_regs(birg, cls, NULL);
+
+ /* some special classes contain only ignore regs, no work to be done */
+ if(allocatable_regs == 0)
+ return;
+
+ be_assure_dom_front(birg);
+ be_assure_liveness(birg);
+ assure_doms(irg);
+
+ env.chordal_env = chordal_env;
+ env.colors_n = colors_n;
+ env.colors = bitset_alloca(colors_n);
+ env.tmp_colors = bitset_alloca(colors_n);
+ env.in_colors = bitset_alloca(colors_n);
+ env.pre_colored = pset_new_ptr_default();
+
+ /* Handle register targeting constraints */
+ dom_tree_walk_irg(irg, constraints, NULL, &env);
+
+ if(chordal_env->opts->dump_flags & BE_CH_DUMP_CONSTR) {
+ snprintf(buf, sizeof(buf), "-%s-constr", chordal_env->cls->name);
+ be_dump(chordal_env->irg, buf, dump_ir_block_graph_sched);
+ }
- env->live = bitset_obstack_alloc(&env->obst, node_count);
- env->colors = bitset_obstack_alloc(&env->obst, TEST_COLORS);
- env->in_colors = bitset_obstack_alloc(&env->obst, TEST_COLORS);
- env->colors_n = TEST_COLORS;
+ env.live = bitset_malloc(get_irg_last_idx(chordal_env->irg));
/* First, determine the pressure */
- dom_tree_walk_irg(irg, pressure, NULL, env);
-
- /* Insert probable spills */
- be_ra_chordal_spill(irg);
+ dom_tree_walk_irg(irg, pressure, NULL, &env);
/* Assign the colors */
- dom_tree_walk_irg(irg, assign, NULL, env);
-
-#ifdef DUMP_IFG
- {
- char buf[128];
-
- ir_snprintf(buf, sizeof(buf), "ifg_%s.dot", get_entity_name(get_irg_entity(irg)));
- dump_ifg(env->graph, buf);
+ dom_tree_walk_irg(irg, assign, NULL, &env);
+
+ if(chordal_env->opts->dump_flags & BE_CH_DUMP_TREE_INTV) {
+ plotter_t *plotter;
+ 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);
+ plotter_free(plotter);
}
-#endif
- set_irg_ra_link(irg, env);
+ bitset_free(env.live);
+ del_pset(env.pre_colored);
}
-void be_ra_chordal_done(ir_graph *irg)
+void be_init_chordal(void)
{
- env_t *env = get_irg_ra_link(irg);
-
-#ifdef BUILD_GRAPH
- free(env->graph);
-#endif
-
- obstack_free(&env->obst, NULL);
- free(env);
+ FIRM_DBG_REGISTER(dbg, "firm.be.chordal.constr");
}
-int phi_ops_interfere(const ir_node *a, const ir_node *b)
-{
-#ifdef BUILD_GRAPH
- ir_graph *irg = get_irn_irg(a);
- env_t *env = get_irg_ra_link(irg);
-
- assert(irg == get_irn_irg(b) && "Both nodes must be in the same graph");
-
- return are_connected(env, get_irn_graph_nr(a), get_irn_graph_nr(b));
-#else
- return values_interfere(a, b);
-#endif /* BUILD_GRAPH */
-}
+BE_REGISTER_MODULE_CONSTRUCTOR(be_init_chordal);
projects / libfirm / blobdiff