#include "bechordal_t.h"
#include "besched_t.h"
#include "bestat.h"
+#include "benodesets.h"
#include "irgmod.h"
#include "iredges_t.h"
#endif
#undef is_Perm
-#define is_Perm(arch_env, irn) (arch_irn_classify(arch_env, irn) == arch_irn_class_perm)
+#define is_Perm(arch_env, irn) (arch_irn_class_is(arch_env, irn, perm))
+
+/* associates op with it's copy and CopyKeep */
+typedef struct {
+ ir_node *op; /* an irn which must be different */
+ pset *copies; /* all non-spillable copies of this irn */
+} op_copy_assoc_t;
+
+/* environment for constraints */
+typedef struct {
+ be_irg_t *birg;
+ pset *op_set;
+ struct obstack obst;
+} constraint_env_t;
/* lowering walker environment */
typedef struct _lower_env_t {
perm_type_t type; /**< type (CHAIN or CYCLE) */
} perm_cycle_t;
+/* Compare the two operands */
+static int cmp_op_copy_assoc(const void *a, const void *b) {
+ const op_copy_assoc_t *op1 = a;
+ const op_copy_assoc_t *op2 = b;
+
+ return op1->op != op2->op;
+}
+
/* Compare the in registers of two register pairs */
static int compare_reg_pair(const void *a, const void *b) {
const reg_pair_t *pair_a = a;
const arch_register_class_t *reg_class;
const arch_env_t *arch_env;
lower_env_t *env = walk_env;
- int real_size = 0;
- int n, i, pn, do_copy, j, n_ops;
+ int real_size = 0;
+ int keep_perm = 0;
+ int n, i, pn, do_copy, j, n_ops;
reg_pair_t *pairs;
const ir_edge_t *edge;
perm_cycle_t *cycle;
/* reroute the edges from the proj to the argument */
edges_reroute(pairs[i].out_node, pairs[i].in_node, env->chord_env->irg);
+ set_irn_n(pairs[i].out_node, 0, new_Bad());
pairs[i].checked = 1;
}
}
DB((mod, LEVEL_1, "\n"));
- /* We don't need to do anything if we have a Perm with two
+ /*
+ We don't need to do anything if we have a Perm with two
elements which represents a cycle, because those nodes
- already represent exchange nodes */
+ already represent exchange nodes
+ */
if (n == 2 && cycle->type == PERM_CYCLE) {
free(cycle);
+ keep_perm = 1;
continue;
}
free(cycle);
}
-
-
/* remove the perm from schedule */
- sched_remove(irn);
+ if (! keep_perm) {
+ int arity = get_irn_arity(irn);
+ for(i = 0; i < arity; ++i) {
+ set_irn_n(irn, i, new_Bad());
+ }
+ sched_remove(irn);
+ }
}
return irn;
}
-static void fix_in(ir_node *irn, ir_node *old, ir_node *nw) {
- int i, n;
-
- irn = belower_skip_proj(irn);
- n = get_irn_arity(irn);
-
- for (i = 0; i < n; i++) {
- if (get_irn_n(irn, i) == old) {
- set_irn_n(irn, i, nw);
- break;
- }
- }
-}
-
-static void gen_assure_different_pattern(ir_node *irn, be_irg_t *birg, ir_node *other_different) {
- const arch_env_t *arch_env = birg->main_env->arch_env;
- ir_node *in[2], *keep, *cpy, *temp;
- ir_node *block = get_nodes_block(irn);
- const arch_register_class_t *cls = arch_get_irn_reg_class(arch_env, other_different, -1);
+static void gen_assure_different_pattern(ir_node *irn, ir_node *other_different, constraint_env_t *env) {
+ be_irg_t *birg = env->birg;
+ pset *op_set = env->op_set;
+ const arch_env_t *arch_env = birg->main_env->arch_env;
+ ir_node *block = get_nodes_block(irn);
+ const arch_register_class_t *cls = arch_get_irn_reg_class(arch_env, other_different, -1);
+ ir_node *in[2], *keep, *cpy;
+ op_copy_assoc_t key, *entry;
FIRM_DBG_REGISTER(firm_dbg_module_t *mod, "firm.be.lower");
if (arch_irn_is(arch_env, other_different, ignore) || ! mode_is_datab(get_irn_mode(other_different))) {
/* in block far far away */
/* The copy is optimized later if not needed */
- temp = new_rd_Unknown(birg->irg, get_irn_mode(other_different));
- cpy = be_new_Copy(cls, birg->irg, block, temp);
+ cpy = be_new_Copy(cls, birg->irg, block, other_different);
be_node_set_flags(cpy, BE_OUT_POS(0), arch_irn_flags_dont_spill);
in[0] = irn;
in[1] = cpy;
- /* Let the irn use the copy instead of the old other_different */
- fix_in(irn, other_different, cpy);
-
/* Add the Keep resp. CopyKeep and reroute the users */
/* of the other_different irn in case of CopyKeep. */
if (get_n_out_edges(other_different) == 0) {
else {
keep = be_new_CopyKeep_single(cls, birg->irg, block, cpy, irn, get_irn_mode(other_different));
be_node_set_reg_class(keep, 1, cls);
- edges_reroute(other_different, keep, birg->irg);
}
- /* after rerouting: let the copy point to the other_different irn */
+ /* let the copy point to the other_different irn */
set_irn_n(cpy, 0, other_different);
+ /* insert copy and keep into schedule */
+ assert(sched_is_scheduled(irn) && "need schedule to assure constraints");
+ sched_add_before(belower_skip_proj(irn), cpy);
+ sched_add_after(irn, keep);
+
+ /* insert the other different and it's copies into the set */
+ key.op = other_different;
+ key.copies = NULL;
+ entry = pset_find(op_set, &key, nodeset_hash(other_different));
+
+ if (! entry) {
+ entry = obstack_alloc(&env->obst, sizeof(*entry));
+ entry->copies = pset_new_ptr_default();
+ entry->op = other_different;
+ }
+
+ /* insert copy */
+ pset_insert_ptr(entry->copies, cpy);
+
+ /* insert keep in case of CopyKeep */
+ if (be_is_CopyKeep(keep))
+ pset_insert_ptr(entry->copies, keep);
+
+ pset_insert(op_set, entry, nodeset_hash(other_different));
+
DBG((mod, LEVEL_1, "created %+F for %+F to assure should_be_different\n", keep, irn));
}
* Checks if node has a should_be_different constraint in output
* and adds a Keep then to assure the constraint.
*/
-static void assure_different_constraints(ir_node *irn, be_irg_t *birg) {
- const arch_env_t *arch_env = birg->main_env->arch_env;
+static void assure_different_constraints(ir_node *irn, constraint_env_t *env) {
const arch_register_req_t *req;
- arch_register_req_t req_temp;
- int i, n;
+ arch_register_req_t req_temp;
- req = arch_get_register_req(arch_env, &req_temp, irn, -1);
+ req = arch_get_register_req(env->birg->main_env->arch_env, &req_temp, irn, -1);
if (req) {
if (arch_register_req_is(req, should_be_different)) {
- gen_assure_different_pattern(irn, birg, req->other_different);
+ gen_assure_different_pattern(irn, req->other_different, env);
}
else if (arch_register_req_is(req, should_be_different_from_all)) {
- n = get_irn_arity(belower_skip_proj(irn));
+ int i, n = get_irn_arity(belower_skip_proj(irn));
for (i = 0; i < n; i++) {
- gen_assure_different_pattern(irn, birg, get_irn_n(belower_skip_proj(irn), i));
+ gen_assure_different_pattern(irn, get_irn_n(belower_skip_proj(irn), i), env);
}
}
}
* @param birg The birg structure containing the irg
*/
void assure_constraints(be_irg_t *birg) {
- irg_walk_blkwise_graph(birg->irg, NULL, assure_constraints_walker, birg);
+ constraint_env_t cenv;
+ op_copy_assoc_t *entry;
+ dom_front_info_t *dom;
+ ir_node **nodes;
+ FIRM_DBG_REGISTER(firm_dbg_module_t *mod, "firm.be.lower");
+
+ cenv.birg = birg;
+ cenv.op_set = new_pset(cmp_op_copy_assoc, 16);
+ obstack_init(&cenv.obst);
+
+ irg_walk_blkwise_graph(birg->irg, NULL, assure_constraints_walker, &cenv);
+
+ /* introduce copies needs dominance information */
+ dom = be_compute_dominance_frontiers(birg->irg);
+
+ /* for all */
+ foreach_pset(cenv.op_set, entry) {
+ int n;
+ ir_node *cp;
+
+ n = pset_count(entry->copies);
+ nodes = alloca((n + 1) * sizeof(nodes[0]));
+
+ /* put the node in an array */
+ n = 0;
+ nodes[n++] = entry->op;
+ DBG((mod, LEVEL_1, "introduce copies for %+F ", entry->op));
+
+ /* collect all copies */
+ foreach_pset(entry->copies, cp) {
+ nodes[n++] = cp;
+ DB((mod, LEVEL_1, ", %+F ", cp));
+ }
+
+ DB((mod, LEVEL_1, "\n"));
+
+ /* introduce the copies for the operand and it's copies */
+ be_ssa_constr(dom, NULL, n, nodes);
+
+
+ /* Could be that not all CopyKeeps are really needed, */
+ /* so we transform unnecessary ones into Keeps. */
+ foreach_pset(entry->copies, cp) {
+ if (be_is_CopyKeep(cp) && get_irn_n_edges(cp) < 1) {
+ ir_node *keep;
+ int n = get_irn_arity(cp);
+
+ keep = be_new_Keep(arch_get_irn_reg_class(birg->main_env->arch_env, cp, -1),
+ birg->irg, get_nodes_block(cp), n, (ir_node **)&get_irn_in(cp)[1]);
+ sched_add_before(cp, keep);
+
+ /* Set all ins (including the block) of the CopyKeep BAD to keep the verifier happy. */
+ while (--n >= -1)
+ set_irn_n(cp, n, new_Bad());
+ sched_remove(cp);
+ }
+ }
+
+ del_pset(entry->copies);
+ }
+
+ be_free_dominance_frontiers(dom);
+
+ del_pset(cenv.op_set);
+ obstack_free(&cenv.obst, NULL);
}
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