#include "beutil.h"
#include "bechordal_t.h"
#include "bearch.h"
+#include "belive_t.h"
#include "benode_t.h"
#include "besched_t.h"
static firm_dbg_module_t *dbg = NULL;
-#define DEBUG_LVL SET_LEVEL_2
+#define DUMP_GRAPHS
+#define get_chordal_arch(ce) ((ce)->main_env->arch_env)
+#define get_reg(irn) arch_get_irn_register(get_chordal_arch(chordal_env), irn)
+#define set_reg(irn, reg) arch_set_irn_register(get_chordal_arch(chordal_env), irn, reg)
-#define get_chordal_arch(ce) ((ce)->session_env->main_env->arch_env)
-#define get_reg(irn) arch_get_irn_register(get_chordal_arch(chordal_env), irn, 0)
-#define set_reg(irn, reg) arch_set_irn_register(get_chordal_arch(chordal_env), irn, 0, reg)
-
-#define is_Branch(irn) (arch_irn_classify(arch_env, irn) == arch_irn_class_branch)
#define is_Perm(irn) (arch_irn_classify(arch_env, irn) == arch_irn_class_perm)
-#define get_reg_cls(irn) (arch_get_irn_reg_class(arch_env, irn, arch_pos_make_out(0)))
+#define get_reg_cls(irn) (arch_get_irn_reg_class(arch_env, irn, -1))
#define is_curr_reg_class(irn) (get_reg_cls(p) == chordal_env->cls)
static void clear_link(ir_node *irn, void *data)
static void collect_phis(ir_node *irn, void *data)
{
be_chordal_env_t *env = data;
- if(is_Phi(irn) &&
- arch_irn_has_reg_class(env->session_env->main_env->arch_env,
- irn, arch_pos_make_out(0), env->cls)) {
-
+ if(is_Phi(irn) && chordal_has_class(env, irn)) {
ir_node *bl = get_nodes_block(irn);
set_irn_link(irn, get_irn_link(bl));
set_irn_link(bl, irn);
*/
static INLINE void build_phi_rings(be_chordal_env_t *env)
{
- irg_walk_graph(env->session_env->irg, clear_link, collect_phis, env);
+ irg_walk_graph(env->irg, clear_link, collect_phis, env);
+}
+
+/**
+ * This struct represents a Proj for a Perm.
+ * It records the argument in the Perm and the corresponding Proj of the
+ * Perm.
+ */
+typedef struct {
+ ir_node *arg; /**< The phi argument to make the Proj for. */
+ int pos; /**< The proj number the Proj will get.
+ This also denotes the position of @p arg
+ in the in array of the Perm. */
+ ir_node *proj; /**< The proj created for @p arg. */
+} perm_proj_t;
+
+static int cmp_perm_proj(const void *a, const void *b, size_t n)
+{
+ const perm_proj_t *p = a;
+ const perm_proj_t *q = b;
+ return !(p->arg == q->arg);
+}
+
+static void insert_all_perms_walker(ir_node *bl, void *data)
+{
+ be_chordal_env_t *chordal_env = data;
+ pmap *perm_map = chordal_env->data;
+ ir_graph *irg = chordal_env->irg;
+ const be_node_factory_t *fact = chordal_env->main_env->node_factory;
+
+ /* Dummy targets for the projs */
+ ir_node *dummy = new_rd_Unknown(irg, mode_T);
+
+ assert(is_Block(bl));
+
+ /* If the link flag is NULL, this block has no phis. */
+ if(get_irn_link(bl)) {
+ int i, n;
+
+ /* Look at all predecessors of the phi block */
+ for(i = 0, n = get_irn_arity(bl); i < n; ++i) {
+ ir_node *phi, *perm, *insert_after, **in;
+ perm_proj_t *pp;
+
+ set *arg_set = new_set(cmp_perm_proj, chordal_env->cls->n_regs);
+ ir_node *pred_bl = get_Block_cfgpred_block(bl, i);
+ int n_projs = 0;
+
+ assert(!pmap_contains(perm_map, pred_bl) && "Already permed that block");
+
+ /*
+ * Note that all phis in the list are in the same register class
+ * by construction.
+ */
+ for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
+ perm_proj_t templ;
+ ir_node *arg = get_irn_n(phi, i);
+ unsigned hash = HASH_PTR(arg);
+
+ templ.arg = arg;
+ pp = set_find(arg_set, &templ, sizeof(templ), hash);
+
+ /*
+ * If a proj_perm_t entry has not been made in the argument set,
+ * create one. The only restriction is, that the phi argument
+ * mey not be live in at the current block, since this argument
+ * interferes with the phi and must thus not be member of a
+ * Perm. A copy will be inserted for this argument alter on.
+ */
+ if(!pp && !is_live_in(bl, arg)) {
+ templ.pos = n_projs++;
+ set_insert(arg_set, &templ, sizeof(templ), hash);
+ }
+ }
+
+ /*
+ * set the in array of the Perm to the arguments of the phis
+ * recorded above
+ */
+ in = malloc(n_projs * sizeof(in[0]));
+ for(pp = set_first(arg_set); pp; pp = set_next(arg_set))
+ in[pp->pos] = pp->arg;
+
+ perm = new_Perm(fact, chordal_env->cls, irg, pred_bl, n_projs, in);
+ insert_after = sched_skip(sched_last(pred_bl), 0, sched_skip_cf_predicator,
+ chordal_env->main_env->arch_env);
+ sched_add_after(insert_after, perm);
+ exchange(dummy, perm);
+
+ /*
+ * Make the Projs for the Perm.
+ * register allocation is copied form former phi arguments
+ * to the projs (new phi arguments)
+ */
+ for(pp = set_first(arg_set); pp; pp = set_next(arg_set)) {
+ pp->proj = new_r_Proj(irg, pred_bl, perm, get_irn_mode(pp->arg), pp->pos);
+ set_reg(pp->proj, get_reg(pp->arg));
+ DBG((dbg, LEVEL_2, "Copy register assignment %s from %+F to %+F\n",
+ get_reg(pp->arg)->name, pp->arg, pp->proj));
+ }
+
+ /*
+ * Set the phi nodes to their new arguments: The Projs of the Perm
+ */
+ for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
+ perm_proj_t templ;
+
+ templ.arg = get_irn_n(phi, i);
+ pp = set_find(arg_set, &templ, sizeof(templ), HASH_PTR(templ.arg));
+
+ assert(pp && "A Perm Proj must be created for this Phi argument");
+ set_irn_n(phi, i, pp->proj);
+ }
+
+ free(in);
+ del_set(arg_set);
+
+ /* register in perm map */
+ pmap_insert(perm_map, pred_bl, perm);
+ }
+ }
}
-static int skip_cf_predicator(const ir_node *irn, void *data) {
- be_chordal_env_t *ce = data;
- arch_env_t *ae = ce->session_env->main_env->arch_env;
- return arch_irn_classify(ae, irn) == arch_irn_class_branch;
+static void insert_all_perms(be_chordal_env_t *chordal_env) {
+ DBG((dbg, LEVEL_1, "Placing perms...\n"));
+ irg_block_walk_graph(chordal_env->irg, insert_all_perms_walker, NULL, chordal_env);
}
#define is_pinned(irn) (get_irn_link(irn))
#define get_pinning_block(irn) ((ir_node *)get_irn_link(irn))
#define pin_irn(irn, lock) (set_irn_link(irn, lock))
+
/**
* Adjusts the register allocation for the phi-operands
* by inserting perm nodes, if necessary.
static void adjust_phi_arguments(be_chordal_env_t *chordal_env, ir_node *phi) {
int i, max;
ir_node *arg, *phi_block, *arg_block;
- arch_env_t *arch_env = get_chordal_arch(chordal_env);
- const be_main_session_env_t *session = chordal_env->session_env;
const arch_register_t *phi_reg, *arg_reg;
const arch_register_class_t *cls;
assert(is_Phi(phi) && "Can only handle phi-destruction :)");
- DBG((dbg, LEVEL_1, " for %+F\n", phi));
- cls = arch_get_irn_reg_class(get_chordal_arch(chordal_env), phi, arch_pos_make_out(0));
phi_block = get_nodes_block(phi);
phi_reg = get_reg(phi);
+ cls = arch_get_irn_reg_class(get_chordal_arch(chordal_env), phi, -1);
/* process all arguments of the phi */
for(i=0, max=get_irn_arity(phi); i<max; ++i) {
- ir_node *perm;
-
arg = get_irn_n(phi, i);
- arg_block = get_nodes_block(arg);
+ arg_block = get_Block_cfgpred_block(phi_block, i);
arg_reg = get_reg(arg);
- perm = get_Proj_pred(arg);
- // assert(is_Perm(perm));
-
- DBG((dbg, LEVEL_1, " arg %+F has perm %+F\n", arg, perm));
- /* if registers don't match ...*/
- if (phi_reg != arg_reg) {
- DBG((dbg, LEVEL_1, " regs don't match %d %d\n", phi_reg, arg_reg));
-
- /* First check if there is another phi in the same block
- * having arg at the same pos in its arg-list and the same color as arg */
+ assert(arg_reg && "Register must be set while placing perms");
+
+ DBG((dbg, LEVEL_1, " for %+F(%s) -- %+F(%s)\n", phi, phi_reg->name, arg, arg_reg->name));
+
+ if(nodes_interfere(chordal_env, phi, arg)) {
+ /* Insert a duplicate in arguments block,
+ * make it the new phi arg,
+ * set its register,
+ * insert it into schedule,
+ * pin it
+ */
+ ir_node *dupl = new_Copy(chordal_env->main_env->node_factory, cls, chordal_env->irg, arg_block, arg);
+ assert(get_irn_mode(phi) == get_irn_mode(dupl));
+ set_irn_n(phi, i, dupl);
+ set_reg(dupl, phi_reg);
+ sched_add_after(sched_skip(sched_last(arg_block), 0, sched_skip_cf_predicator, chordal_env->main_env->arch_env), dupl);
+ pin_irn(dupl, phi_block);
+ DBG((dbg, LEVEL_1, " they do interfere: insert %+F(%s)\n", dupl, get_reg(dupl)->name));
+ } else {
+ /*
+ * First check if there is a phi
+ * - in the same block
+ * - having arg at the current pos in its arg-list
+ * - having the same color as arg
+ *
+ * If found, then pin the arg
+ */
+ DBG((dbg, LEVEL_1, " they do not interfere\n"));
+ assert(is_Proj(arg));
if (!is_pinned(arg)) {
- DBG((dbg, LEVEL_1, " arg is not pinned\n"));
- ir_node *other_phi = phi;
- for(other_phi = get_irn_link(phi_block); other_phi; other_phi = get_irn_link(other_phi)) {
- if(other_phi == phi)
- continue;
+ ir_node *other_phi;
+ DBG((dbg, LEVEL_1, " searching for phi with same arg having args register\n"));
+ for(other_phi = get_irn_link(phi_block); other_phi; other_phi = get_irn_link(other_phi)) {
assert(is_Phi(other_phi) && get_nodes_block(phi) == get_nodes_block(other_phi) && "link fields are screwed up");
if (get_irn_n(other_phi, i) == arg && get_reg(other_phi) == arg_reg) {
- DBG((dbg, LEVEL_1, " other phi pinned the argument\n"));
+ DBG((dbg, LEVEL_1, " found %+F(%s)\n", other_phi, get_reg(other_phi)->name));
pin_irn(arg, phi_block);
}
}
}
- /* If arg is pinned, another phi set the color of arg and pinned it.
- * So this phi can't change the color again and a duplicate must be inserted.
- *
- * If arg interferes with phi, one can never set the same color for both
- * Hence, a duplicate must be inserted */
- if (is_pinned(arg) || nodes_interfere(chordal_env, phi, arg)) {
- ir_node *dupl, *tmp;
- assert(get_pinning_block(arg) == phi_block && "If arg is pinned it must be due to a phi in the same block");
-
- dupl = new_Copy(session->main_env->node_factory, cls, session->irg, arg_block, arg);
+ if (is_pinned(arg)) {
+ /* Insert a duplicate of the original value in arguments block,
+ * make it the new phi arg,
+ * set its register,
+ * insert it into schedule,
+ * pin it
+ */
+ ir_node *perm = get_Proj_pred(arg);
+ ir_node *orig_val = get_irn_n(perm, get_Proj_proj(arg));
+ ir_node *dupl = new_Copy(chordal_env->main_env->node_factory, cls, chordal_env->irg, arg_block, orig_val);
+ assert(get_irn_mode(phi) == get_irn_mode(dupl));
set_irn_n(phi, i, dupl);
set_reg(dupl, phi_reg);
- DBG((dbg, LEVEL_1, " inserting dupl %+F\n", dupl));
-
- /* Add dupl to schedule */
- tmp = sched_next(perm);
- while (is_Proj(tmp) && sched_has_next(tmp))
- tmp = sched_next(tmp);
- sched_add_after(tmp, dupl);
-
- /* Add dupl to chained list of duplicates. Ptrs starting at the Perm */
- tmp = perm;
- while (get_irn_link(tmp))
- tmp = get_irn_link(tmp);
- set_irn_link(tmp, dupl);
- set_irn_link(dupl, NULL);
-
- /* now the arg is the dupl */
- arg = dupl;
+ sched_add_before(perm, dupl);
+ pin_irn(dupl, phi_block);
+ DBG((dbg, LEVEL_1, " arg is pinned: insert %+F(%s)\n", dupl, get_reg(dupl)->name));
} else {
- /* Arg is not pinned. So set its color to the color of the phi.
- * If the phi color is used by another proj of this perm
- * one must NOT swap the colors. Proof: Critical edges removed,
- * livein(PhiBl) = liveout(ArgBl), if all phis are processed then
- * every color is used exactly once.
+ /* No other phi has the same color (else arg would be pinned),
+ * so just set the register and pin
*/
- DBG((dbg, LEVEL_1, " just set color\n"));
set_reg(arg, phi_reg);
+ pin_irn(arg, phi_block);
+ DBG((dbg, LEVEL_1, " arg is not pinned: so pin %+F(%s)\n", arg, get_reg(arg)->name));
}
}
-
- /* Now the color of the arg (arg may be a dupl now) and the phi-result are equal.
- * Pin it, so everyone knows and it never gets changed again.
- * An arg never is a phi, because perms were inserted. So the link field is free */
- DBG((dbg, LEVEL_1, " arg has correct color (now), so pin it\n"));
- pin_irn(arg, phi_block);
}
}
-static void insert_all_perms_walker(ir_node *bl, void *data)
-{
- be_chordal_env_t *ce = data;
- pmap *perm_map = ce->data;
- ir_graph *irg = ce->session_env->irg;
- const be_node_factory_t *fact = ce->session_env->main_env->node_factory;
-
- /* Dummy targets for the projs */
- ir_node *dummy = new_rd_Unknown(irg, mode_T);
-
- assert(is_Block(bl));
-
- /* If the link flag is NULL, this block has no phis. */
- if(get_irn_link(bl)) {
- int i, n;
-
- /* Look at all predecessors of the phi block */
- for(i = 0, n = get_irn_arity(bl); i < n; ++i) {
- ir_node *pred_bl = get_Block_cfgpred_block(bl, i);
- ir_node *phi, *perm, *insert_after;
- ir_node **in;
- int j, n_projs = 0;
- pmap_entry *ent;
- pmap *arg_map = pmap_create();
-
- assert(!pmap_contains(perm_map, pred_bl) && "Already permed that block");
-
- /*
- * Note that all phis in the ring are in the same register class
- * by construction.
- */
- for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
- ir_node *arg = get_irn_n(phi, i);
- ir_node *proj = pmap_get(arg_map, arg);
-
- if(!proj) {
- proj = new_r_Proj(irg, pred_bl, dummy, get_irn_mode(arg), n_projs++);
- pmap_insert(arg_map, arg, proj);
- }
-
- set_irn_n(phi, i, proj);
- }
-
- j = 0;
- in = malloc(n_projs * sizeof(in[0]));
- pmap_foreach(arg_map, ent)
- in[j++] = ent->key;
-
- perm = new_Perm(fact, ce->cls, irg, pred_bl, n_projs, in);
- insert_after = sched_skip(sched_last(pred_bl), 0, skip_cf_predicator, ce);
- sched_add_after(insert_after, perm);
- exchange(dummy, perm);
-
- free(in);
- pmap_destroy(arg_map);
-
- /* register in perm map */
- pmap_insert(perm_map, pred_bl, perm);
- }
- }
-}
-
-static void insert_all_perms(be_chordal_env_t *chordal_env) {
- DBG((dbg, LEVEL_1, "Placing perms...\n"));
- irg_block_walk_graph(chordal_env->session_env->irg, insert_all_perms_walker, NULL, chordal_env);
-}
-
static void set_regs_or_place_dupls_walker(ir_node *bl, void *data) {
- be_chordal_env_t *chordal_env = data;
- ir_node *phi;
+ be_chordal_env_t *chordal_env = data;
+ ir_node *phi;
- DBG((dbg, LEVEL_1, "Setting regs and placing dupls...\n"));
- for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi))
- adjust_phi_arguments(chordal_env, phi);
+ for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi))
+ adjust_phi_arguments(chordal_env, phi);
}
static void set_regs_or_place_dupls(be_chordal_env_t *chordal_env)
{
- irg_block_walk_graph(chordal_env->session_env->irg,
- set_regs_or_place_dupls_walker, NULL, chordal_env);
+ DBG((dbg, LEVEL_1, "Setting regs and placing dupls...\n"));
+ irg_block_walk_graph(chordal_env->irg, set_regs_or_place_dupls_walker, NULL, chordal_env);
}
void be_ssa_destruction(be_chordal_env_t *chordal_env) {
pmap *perm_map = pmap_create();
- ir_graph *irg = chordal_env->session_env->irg;
+ ir_graph *irg = chordal_env->irg;
dbg = firm_dbg_register("ir.be.ssadestr");
- firm_dbg_set_mask(dbg, DEBUG_LVL);
/* create a map for fast lookup of perms: block --> perm */
chordal_env->data = perm_map;
- build_phi_rings(chordal_env);
+ build_phi_rings(chordal_env);
insert_all_perms(chordal_env);
- dump_ir_block_graph(irg, "-ssa_destr_perms_placed");
-
+#ifdef DUMP_GRAPHS
+ dump_ir_block_graph_sched(irg, "-ssa_destr_perms_placed");
+#endif
set_regs_or_place_dupls(chordal_env);
- dump_ir_block_graph(irg, "-ssa_destr_regs_set");
+#ifdef DUMP_GRAPHS
+ dump_ir_block_graph_sched(irg, "-ssa_destr_regs_set");
+#endif
pmap_destroy(perm_map);
}
static void ssa_destruction_check_walker(ir_node *bl, void *data)
{
- be_chordal_env_t *chordal_env = data;
- ir_node *phi;
+ be_chordal_env_t *chordal_env = data;
+ ir_node *phi;
int i, max;
- for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
- const arch_register_t *phi_reg, *arg_reg;
-
- phi_reg = get_reg(phi);
- /* iterate over all args of phi */
- for(i=0, max=get_irn_arity(phi); i<max; ++i) {
- ir_node *arg = get_irn_n(phi, i);
- arg_reg = get_reg(arg);
- if(phi_reg != arg_reg) {
- ir_printf("Registers of %+F and %+F differ: %s %s\n",
- phi, arg, phi_reg->name, arg_reg->name);
- assert(0 && "Registers of phi and arg differ\n");
- }
- if(!is_pinned(arg))
- ir_printf("Warning: Arg %+F not pinned\n", arg);
- }
- }
+ for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
+ const arch_register_t *phi_reg, *arg_reg;
+
+ phi_reg = get_reg(phi);
+ /* iterate over all args of phi */
+ for(i=0, max=get_irn_arity(phi); i<max; ++i) {
+ ir_node *arg = get_irn_n(phi, i);
+ arg_reg = get_reg(arg);
+ if(phi_reg != arg_reg) {
+ DBG((dbg, 0, "Error: Registers of %+F and %+F differ: %s %s\n", phi, arg, phi_reg->name, arg_reg->name));
+ assert(0);
+ }
+ if(!is_pinned(arg)) {
+ DBG((dbg, 0, "Warning: Phi argument %+F is not pinned.\n", arg));
+ assert(0);
+ }
+ }
+ }
}
void be_ssa_destruction_check(be_chordal_env_t *chordal_env) {
- irg_block_walk_graph(chordal_env->session_env->irg,
- ssa_destruction_check_walker, NULL, chordal_env);
+ irg_block_walk_graph(chordal_env->irg, ssa_destruction_check_walker, NULL, chordal_env);
}
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