*
* Performs SSA-Destruction.
*/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
#include "debug.h"
#include "set.h"
#include "pmap.h"
-#include "irnode.h"
+#include "irnode_t.h"
+#include "ircons_t.h"
#include "iredges_t.h"
+#include "irgmod.h"
+#include "irdump.h"
+#include "irprintf.h"
+
#include "be_t.h"
+#include "beutil.h"
#include "bechordal_t.h"
#include "bearch.h"
+#include "belive_t.h"
#include "benode_t.h"
#include "besched_t.h"
-#define get_reg(irn) arch_get_irn_register(chordal_env->arch_env, irn, 0)
-#define set_reg(irn, reg) arch_set_irn_register(chordal_env->arch_env, irn, 0, reg)
+static firm_dbg_module_t *dbg = NULL;
+#define DEBUG_LVL SET_LEVEL_0
+
+
+#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_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 is_curr_reg_class(irn) (get_reg_cls(p) == chordal_env->cls)
+
+static void clear_link(ir_node *irn, void *data)
+{
+ set_irn_link(irn, NULL);
+}
/**
- * Maps blocks to perm nodes inserted during phi destruction.
+ * Build a list of phis of a block.
*/
-typedef struct _block2perm_t {
- ir_node *block, *perm;
-} block2perm_t;
-
-static int set_cmp_b2p(const void *x, const void *y, size_t size) {
- const block2perm_t *b1 = x;
- const block2perm_t *b2 = y;
- return b1->block != b2->block;
+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)) {
+
+ ir_node *bl = get_nodes_block(irn);
+ set_irn_link(irn, get_irn_link(bl));
+ set_irn_link(bl, irn);
+ }
}
+/**
+ * Build a ring of phis for each block in the link field.
+ * @param env The chordal env.
+ */
+static INLINE void build_phi_rings(be_chordal_env_t *env)
+{
+ irg_walk_graph(env->session_env->irg, clear_link, collect_phis, env);
+}
+
+static int skip_cf_predicator(const ir_node *irn, void *data) {
+ be_chordal_env_t *chordal_env = data;
+ arch_env_t *ae = chordal_env->session_env->main_env->arch_env;
+ return arch_irn_classify(ae, irn) == arch_irn_class_branch;
+}
+
+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->session_env->irg;
+ const be_node_factory_t *fact = chordal_env->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 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 list 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 && !is_live_in(bl, arg)) {
+ proj = new_r_Proj(irg, pred_bl, dummy, get_irn_mode(arg), n_projs++);
+ pmap_insert(arg_map, arg, proj);
+ }
+
+ if (proj) {
+ assert(get_irn_mode(phi) == get_irn_mode(proj));
+ set_irn_n(phi, i, proj);
+ }
+ }
+
+ in = malloc(n_projs * sizeof(in[0]));
+ pmap_foreach(arg_map, ent) {
+ int proj_nr = get_Proj_proj(ent->value);
+ in[proj_nr] = ent->key;
+ }
+
+ perm = new_Perm(fact, chordal_env->cls, irg, pred_bl, n_projs, in);
+ insert_after = sched_skip(sched_last(pred_bl), 0, skip_cf_predicator, chordal_env);
+ sched_add_after(insert_after, perm);
+ exchange(dummy, perm);
+
+ /* register allocation is copied form former arguments to the projs (new arguments) */
+ pmap_foreach(arg_map, ent) {
+ DBG((dbg, LEVEL_2, "Copy register assignment %s from %+F to %+F\n", get_reg(ent->key)->name, ent->key, ent->value));
+ set_reg(ent->value, get_reg(ent->key));
+ }
+
+ 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);
+}
+
+#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.
* @param phi The phi node to adjust operands for
*/
-static void adjust_arguments(be_main_session_env_t *session, be_chordal_env_t *chordal_env, const ir_node *phi) {
+static void adjust_phi_arguments(be_chordal_env_t *chordal_env, ir_node *phi) {
int i, max;
- ir_node *arg, *perm, *proj;
- const arch_register_t *phi_reg, *arg_reg, *proj_reg;
- const ir_edge_t *edge;
- set *b2p;
- block2perm_t find, *found;
+ ir_node *arg, *phi_block, *arg_block;
+ 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 :)");
- b2p = chordal_env->data;
+ phi_block = get_nodes_block(phi);
phi_reg = get_reg(phi);
- /* all arguments of the phi */
+ cls = arch_get_irn_reg_class(get_chordal_arch(chordal_env), phi, arch_pos_make_out(0));
+
+ /* process all arguments of the phi */
for(i=0, max=get_irn_arity(phi); i<max; ++i) {
arg = get_irn_n(phi, i);
+ arg_block = get_Block_cfgpred_block(phi_block, i);
arg_reg = get_reg(arg);
- /* if registers don't match ...*/
- if (phi_reg != arg_reg) {
- /* iff needed insert perm node */
- find.block = get_nodes_block(arg);
- find.perm = NULL;
- found = set_insert(b2p, &find, sizeof(find), HASH_PTR(find.block));
- if (!found->perm)
- found->perm = insert_Perm_after(session, chordal_env->cls, sched_last(find.block));
-
- /* now we have the perm in the predecessor block */
- perm = found->perm;
- /* adjust assigned registers for the projs */
- foreach_out_edge(perm, edge) {
- proj = get_edge_src_irn(edge);
- proj_reg = get_reg(proj);
- if (proj_reg == arg_reg)
- set_reg(proj, phi_reg);
- else if (proj_reg == phi_reg)
- set_reg(proj, arg_reg);
+ 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(session->main_env->node_factory, cls, session->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, skip_cf_predicator, chordal_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)) {
+ 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, " found %+F(%s)\n", other_phi, get_reg(other_phi)->name));
+ pin_irn(arg, phi_block);
+ }
+ }
+ }
+
+ 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(session->main_env->node_factory, cls, session->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);
+ 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 {
+ /* No other phi has the same color (else arg would be pinned),
+ * so just set the register and pin
+ */
+ 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));
}
}
}
}
-static void checker(be_chordal_env_t *chordal_env) {
- pmap_entry *pme;
+static void set_regs_or_place_dupls_walker(ir_node *bl, void *data) {
+ be_chordal_env_t *chordal_env = data;
+ ir_node *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)
+{
+ DBG((dbg, LEVEL_1, "Setting regs and placing dupls...\n"));
+ irg_block_walk_graph(chordal_env->session_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;
+
+ 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);
+ insert_all_perms(chordal_env);
+ dump_ir_block_graph_sched(irg, "-ssa_destr_perms_placed");
+
+ set_regs_or_place_dupls(chordal_env);
+ dump_ir_block_graph_sched(irg, "-ssa_destr_regs_set");
+
+ 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;
int i, max;
- /* iterate over all blocks */
- pmap_foreach(chordal_env->border_heads, pme) {
- border_t *curr;
- struct list_head *head = pme->value;
-
- /* iterate over all ops in the block */
- list_for_each_entry_reverse(border_t, curr, head, list)
- if (curr->is_def && curr->is_real && is_Phi(curr->irn)) {
- const arch_register_t *phi_reg, *arg_reg;
- phi_reg = get_reg(curr->irn);
- /* iterate over all args of phi */
- for(i=0, max=get_irn_arity(curr->irn); i<max; ++i) {
- arg_reg = get_reg(get_irn_n(curr->irn, i));
- assert(phi_reg == arg_reg && "WTF? You can do it better!?");
- }
+ 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(be_main_session_env_t *session, be_chordal_env_t *chordal_env) {
- pmap_entry *pme;
- set *b2p;
-
- b2p = new_set(set_cmp_b2p, 32);
- chordal_env->data = b2p;
- /* iterate over all blocks */
- pmap_foreach(chordal_env->border_heads, pme) {
- border_t *curr;
- struct list_head *head = pme->value;
-
- /* iterate over all ops in the block
- * BETTER: phis are the first ops, so stop iteration on first non-phi-op */
- list_for_each_entry_reverse(border_t, curr, head, list)
- if (curr->is_def && curr->is_real && is_Phi(curr->irn))
- adjust_arguments(session, chordal_env, curr->irn);
- }
- del_set(b2p);
- checker(chordal_env);
+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);
}
projects / libfirm / blobdiff