#include <stdlib.h>
#include "obst.h"
+#include "set.h"
#include "pset.h"
#include "bitset.h"
#include "debug.h"
+#include "irouts.h"
+#include "irdom.h"
#include "bechordal.h"
#include "belive.h"
#include "bera_t.h"
-#include "bephicongr_t.h"
+#include "phiclass_t.h"
#include "bephicoal_t.h"
-#define DEBUG_LVL SET_LEVEL_2
-
-#define MAX_PHI_CLS_SIZE (1<<(sizeof(unsigned char)*8)) /* possible colors added should fit into unsigned char */
+#define DEBUG_LVL SET_LEVEL_3
#define MAX_COLORS 16
-#define CHANGE_IMPOSSIBLE -1
-#define CHANGE_SAVE 1
-#define DRYRUN 1
-#define PERFORM 0
+#define INITIAL_SLOTS_PINNED_GLOBAL 256
+#define INITIAL_SLOTS_FREE_NODES 128
+#define INITIAL_SLOTS_CHANGED_NODES 32
-typedef struct _phi_unit_t {
- unsigned char count;
- unsigned char phi_count;
-
- /* 1 phi */
- ir_node **members; /**< [0] is the phi node. [1..count-1] the arguments of the phi not interfering with it */
- char *is_live_in; /**< [i]==1 means members[i] is live-in in (all of) its cf-pred-blocks of the phi node */
- int *colors; /**< [i] is the color to set for members[i]. [i] == NO_COLOR means dont change anything for members[i]*/
- int size; /**< size of the max independent set of members. The set is markes by colors[i] != NO_COLOR */
- int changes; /**< number of re-assigned nodes belonging to phi-classes */
-} phi_unit_t;
+/* some things for readable code */
+#define CHANGE_SAVE NULL
+#define CHANGE_IMPOSSIBLE (ir_node *)1
+#define CHANGE_NYI (ir_node *)2
+#define is_conflicting_node(n) (((int)n) > 2)
+/**
+ * Models conflicts between nodes. These may be life range conflicts or
+ * pinning conflicts which may occur while changing colors
+ */
+typedef struct _conflict_t {
+ ir_node *n1, *n2;
+} conflict_t;
-static firm_dbg_module_t *dbgphi = NULL;
+/**
+ * If an irn is changed, the changes first get stored in a node_stat_t,
+ * to allow undo of changes in case of conflicts.
+ */
+typedef struct _node_stat_t {
+ ir_node *irn;
+ int color;
+ int undo_color;
+ char status; /**< Bit 0: pinned, Bit 1: removed */
+} node_stat_t;
+
+#define _set_pinned(nodestat) nodestat->status |= 1
+#define _set_removed(nodestat) nodestat->status |= 2
+#define _clear_pinned(nodestat) nodestat->status &= 255 ^ 1
+#define _clear_removed(nodestat) nodestat->status &= 255 ^ 2
+#define _is_pinned(nodestat) (nodestat->status & 1)
+#define _is_removed(nodestat) (nodestat->status & 2)
/**
- * Contains ir_nodes of phi-classes whose colors were reassigned during coalescing.
- * So one can check not to switch them twice or more.
+ * Central data structure. Contains infos needed during coalescing of the
+ * corresponding phi class.
*/
-static pset *pinned_nodes = NULL;
+typedef struct _phi_unit_t {
+ unsigned char phi_count; /**< the number of phi nodes in this unit */
+ /* 1 phi */
+ unsigned char node_count; /**< size of the nodes-array */
+ unsigned char conflict_count; /**< size of the conflicts-array */
+ unsigned char conflict_count_org; /**< initial size of the conflicts-array */
+ ir_node **nodes; /**< [0] is the phi node. [1..node_count-1] the arguments of the phi not interfering with it */
+ conflict_t *conflicts; /**< pairs of conflicting ir_nodes. */
+ set *changed_nodes; /**< contains node_stat_t's. */
+} phi_unit_t;
+
+static firm_dbg_module_t *dbgphi = NULL;
/**
* Contains ir_nodes of phi-classes whose colors may change unlimited times.
*/
static pset *free_nodes = NULL;
+/**
+ * Contains already optimized ir_nodes of phi-classes fully processed.
+ * So one can perform a check not to switch them twice or more.
+ */
+static pset *pinned_global = NULL;
-/* TODO: ask/check if additional ir_node-space is initialized with 0000 */
-#define belongs_to_a_phi_class(n) (get_irn_phi_info(n)->phi)
+int set_cmp_node_stat_t(const void *x, const void *y, size_t size) {
+ return ((node_stat_t *)x)->irn != ((node_stat_t *)y)->irn;
+}
-#define is_color_free(bl,col) (!bitset_is_set(get_ra_block_info(bl)->used_colors, col))
+/**
+ * Finds a node status entry of a node if existent.
+ */
+static INLINE node_stat_t *pu_find_node(phi_unit_t *pu, ir_node *irn) {
+ node_stat_t find;
+ find.irn = irn;
+ return set_find(pu->changed_nodes, &find, sizeof(find), HASH_PTR(irn));
+}
/**
- * Set the color of node @p n to @p col, but acts
- * pinning aware.
+ * Finds a node status entry of a node if existent. Otherwise it will return
+ * an initialized new entry for this node.
*/
-static INLINE void set_color(ir_node *n, int col) {
- assert(!pset_find_ptr(pinned_nodes, n));
- set_irn_color(n, col);
- if (belongs_to_a_phi_class(n) && !pset_find_ptr(free_nodes, n))
- pset_insert_ptr(pinned_nodes, n);
+static INLINE node_stat_t *pu_find_or_insert_node(phi_unit_t *pu, ir_node *irn) {
+ node_stat_t find;
+ find.irn = irn;
+ find.color = NO_COLOR;
+ find.undo_color = NO_COLOR;
+ find.status = 0;
+ return set_insert(pu->changed_nodes, &find, sizeof(find), HASH_PTR(irn));
}
/**
- * Tries to set the color of @p n to @p col.
- * @param n The node to set the color for
- * @param col The color to set.
- * @param dryrun If true no colors are actually set, only testing is performed.
- * If false colors get set and it must be sure that no conflicts will occur.
- * @return If setting the color is impossible CHANGE_IMPOSSIBLE is returned
- * else the number of nodes that need a (cascading) change is returned.
+ * @return The virtual color of a node, if set before, else just the real color.
*/
-static int color_irn(ir_node *n, int col, int dryrun) {
- ir_node *bl;
- int res = 0;
- DBG((dbgphi, LEVEL_2, "\t\t\t%n --> %d\n", n, col));
- assert(is_color(col));
-
- if (get_irn_color(n) == col) {
- DBG((dbgphi, LEVEL_2, "\t\t\t Same\n"));
- return 0;
- }
+static INLINE int pu_get_new_color(phi_unit_t *pu, ir_node *irn) {
+ node_stat_t *found = pu_find_node(pu, irn);
+ if (found)
+ return found->color;
+ else
+ return get_irn_color(irn);
+}
- if (pset_find_ptr(pinned_nodes, n)) {
- DBG((dbgphi, LEVEL_2, "\t\t\t Pinned\n"));
- if (!dryrun)
- assert(0 && "No prior check with dryrun=1 or buggy");
- return CHANGE_IMPOSSIBLE;
- }
+/**
+ * Sets the virtual color of a node.
+ */
+static INLINE void pu_set_new_color(phi_unit_t *pu, ir_node *irn, int color) {
+ node_stat_t *found = pu_find_or_insert_node(pu, irn);
+ /* TODO Think about
+ * This is only correct if no color is set >=2 times while changing
+ * a single phi-unit-member */
+ found->undo_color = found->color;
+ found->color = color;
+}
- bl = get_nodes_block(n);
- if (is_color_free(bl, col) && !is_live_out(bl, n)) {
- DBG((dbgphi, LEVEL_2, "\t\t\t Free\n"));
- if (!dryrun)
- set_color(n, col);
- return 1;
- }
+/**
+ * Checks if a node is removed from consideration respectively building
+ * a maximum independent set.
+ */
+static INLINE int pu_is_node_removed(phi_unit_t *pu, ir_node *irn) {
+ node_stat_t *found = pu_find_node(pu, irn);
+ if (found)
+ return _is_removed(found);
+ else
+ return 0;
+}
- /* for now, in the aldi-version return impossible */
- DBG((dbgphi, LEVEL_2, "\t\t\t Impossible\n"));
- return CHANGE_IMPOSSIBLE;
+/**
+ * Removes a node from the base set, out of which a maximum independet
+ * set gets build from.
+ */
+static INLINE void pu_remove_node(phi_unit_t *pu, ir_node *irn) {
+ node_stat_t *found = pu_find_or_insert_node(pu, irn);
+ _set_removed(found);
+}
- return res;
+/**
+ * Checks if a node is local pinned; i.e. it belongs to the same phi unit and
+ * has been optimized before the current processed one.
+ */
+static INLINE int pu_is_node_pinned(phi_unit_t *pu, ir_node *irn) {
+ node_stat_t *found = pu_find_node(pu, irn);
+ if (found)
+ return _is_pinned(found);
+ else
+ return 0;
}
+/**
+ * Local-pins a node, so optimizations of further nodes of the same phi unit
+ * can handle situations in which a color change would undo prior optimizations.
+ */
+static INLINE void pu_pin_node(phi_unit_t *pu, ir_node *irn) {
+ node_stat_t *found = pu_find_or_insert_node(pu, irn);
+ _set_pinned(found);
+}
/**
- * Tries to set as much members of a phi unit as possible to color @p col.
+ * If a local pinned conflict occurs, a new edge in the conflict graph is added.
+ * The next maximum independent set build, will regard it.
*/
-static void try_colors(phi_unit_t *pu, int col, int b_size, int b_changes) {
- struct obstack ob;
- struct obstack ob_changes;
- int i, o, cand_size, total_changes, *changes;
- ir_node **cand, **mis;
-
- cand_size = 0;
- obstack_init(&ob);
- obstack_init(&ob_changes);
-
- /* first init pessimistically, so we can just return
- * if we see there wont be a better result */
- for (i = 0; i < pu->count; ++i)
- pu->colors[i] = NO_COLOR;
- pu->size = 0;
- pu->changes = 0;
-
- /* For all members check if color would be possible.
- * Does not check if color is possible in combination with
- * other members colors being set */
- total_changes = 0;
- for (i = 0; i < pu->count; ++i) {
- DBG((dbgphi, 1, "\t\t Testing %n\n", pu->members[i]));
- int curr_changes = color_irn(pu->members[i], col, DRYRUN);
- if (curr_changes != CHANGE_IMPOSSIBLE) {
- DBG((dbgphi, 1, "\t\t\tAdding to cand\n"));
- obstack_ptr_grow(&ob, pu->members[i]);
- obstack_grow(&ob_changes, &curr_changes, sizeof(curr_changes));
- cand_size++;
- total_changes += curr_changes;
- } else {
- DBG((dbgphi, 1, "\t\t\tImpossible\n"));
- }
- /* if color is not possible for the phi node then exit (phi comes first)*/
- if (cand_size == 0)
- goto ret;
+static INLINE void pu_add_conflict(phi_unit_t *pu, ir_node *n1, ir_node *n2) {
+ int count = pu->conflict_count;
+
+ assert(count != 255 && "Too much conflicts. Can hold max 255 entries");
+ if ((count & 15) == 0)
+ pu->conflicts = realloc(pu->conflicts, (count + 16)*sizeof(*pu->conflicts));
+
+ if ((int)n1 < (int)n2) {
+ pu->conflicts[count].n1 = n1;
+ pu->conflicts[count].n2 = n2;
+ } else {
+ pu->conflicts[count].n1 = n2;
+ pu->conflicts[count].n2 = n1;
}
- cand = obstack_finish(&ob);
- changes = obstack_finish(&ob_changes);
- /* shortcut: if cand is worse than best the mis wont be better. */
- if (cand_size < b_size || (cand_size == b_size && total_changes >= b_changes))
- goto ret;
+ pu->conflict_count++;
+}
+
+/**
+ * Checks if two nodes are in a conflict.
+ */
+static INLINE int pu_are_conflicting(phi_unit_t *pu, ir_node *n1, ir_node *n2) {
+ const ir_node *o1, *o2;
+ int i;
+
+ if ((int)n1 < (int)n2) {
+ o1 = n1;
+ o2 = n2;
+ } else {
+ o1 = n2;
+ o2 = n1;
+ }
+
+ for (i = 0; i < pu->conflict_count; ++i)
+ if (pu->conflicts[i].n1 == o1 && pu->conflicts[i].n2 == o2)
+ return 1;
+ return 0;
+}
+
+/**
+ * Determines a maximum independent set with respect to the conflict edges
+ * in pu->conflicts and the nodes beeing all non-removed nodes of pu->nodes.
+ * TODO: make this 'un-greedy'
+ * TODO: be aware that phi nodes should find their way in the set.
+ * for 1 phi in greedy version this is no prob, cause is comes first at [0].
+ */
+int pu_get_max_ind_set(phi_unit_t *pu, struct obstack *res) {
+ int i, o, size = 0;
+ ir_node **mis;
- /* now take the candidates cand and determine a max independent set
- * with respect to edges representing live range interference */
- /* TODO: make this 'un-greedy' */
DBG((dbgphi, 1, "\t\t Max indep set\n"));
- for (i = 0; i < cand_size; ++i) {
+ for (i = 0; i < pu->node_count; ++i) {
int intf_det = 0;
- for (o = 0; o < pu->size; ++o) {
- mis = (ir_node**) obstack_base(&ob);
- if (values_interfere(cand[i], mis[o])) {
+ if (pu_is_node_removed(pu, pu->nodes[i]))
+ continue;
+ mis = (ir_node**) obstack_base(res);
+ for (o = 0; o < size; ++o)
+ if (phi_ops_interfere(pu->nodes[i], mis[o])) {
intf_det = 1;
break;
}
- }
if (!intf_det) {
- DBG((dbgphi, 1, "\t\t\tAdding to mis %n\n", cand[i]));
- obstack_ptr_grow(&ob, cand[i]);
- pu->size++;
- pu->changes += changes[i];
+ DBG((dbgphi, 1, "\t\t\tAdding to mis %n\n", pu->nodes[i]));
+ obstack_ptr_grow(res, pu->nodes[i]);
+ size++;
}
}
- mis = obstack_finish(&ob);
-
- /* Now set the colors of all nodes in the mis to col.
- * - Each change taken alone is conflict free.
- * - If all members are not live-in in their cf-pred-blocks there will be no
- * conflict applying all changes
- * - If there is a member, which is live-in in its cf-pred-block of the phi
- * node, it is possible that all changes together will conflict.
- */
- for (i = 0; i < pu->count; ++i)
- for (o = 0; o < pu->size; ++o)
- if (pu->members[i] == mis[o] && get_irn_color(pu->members[i]) != col)
- pu->colors[i] = col;
+ return size;
+}
-ret:
- obstack_free(&ob_changes, NULL);
- obstack_free(&ob, NULL);
+/**
+ * Performs virtual re-coloring of node @p n to color @p col. Virtual colors of
+ * other nodes are changed too, as required to preserve correctness. Function is
+ * aware of local and global pinning. Recursive.
+ * @param irn The node to set the color for
+ * @param col The color to set.
+ * @param trigger The irn that caused the wish to change the color of the irn
+ * @param changed_nodes An obstack on which all ir_nodes get growed on, which are changed
+ * @return CHANGE_SAVE iff setting the color is possible, with all transiteve effects.
+ * CHANGE_IMPOSSIBLE iff conflicts with reg-constraintsis occured.
+ * CHANGE_NYI iff an unhandled situation occurs.
+ * Else the first conflicting ir_node encountered is returned.
+ *
+ * ASSUMPTION: Assumes that a life range of a single value can't be spilt into
+ * several smaller intervals where other values can live in between.
+ */
+static ir_node *_pu_color_irn(phi_unit_t *pu, ir_node *irn, int col, const ir_node *trigger, struct obstack *changed_nodes) {
+ ir_node *res;
+ struct obstack confl_ob;
+ ir_node **confl, *cn;
+ int i, irn_col;
+
+ obstack_init(&confl_ob);
+ irn_col = pu_get_new_color(pu, irn);
+
+ if (irn_col == col)
+ goto ret_save;
+ if (pset_find_ptr(pinned_global, irn) || pu_is_node_pinned(pu, irn)) {
+ DBG((dbgphi, LEVEL_2, "\t\t\t%n \t~~> %n := %d: Pinned\n", trigger, irn, col));
+ res = irn;
+ goto ret_confl;
+ }
+
+ /* get all nodes which would conflict with this change */
+ {
+ struct obstack q;
+ int in, out;
+
+ /* setup the queue */
+ obstack_init(&q);
+ obstack_ptr_grow(&q, get_nodes_block(irn));
+ in = 1;
+ out = 0;
+
+ /* process the queue */
+ while (out < in) {
+ ir_node *curr_bl, *sub_bl;
+ int i, max;
+
+ curr_bl = ((ir_node **)obstack_base(&q))[out++];
+
+ /* Add to the result all nodes in the block which live in target color
+ * and interfere with the irn */
+ for (i = 0, max = get_irn_n_outs(curr_bl); i < max; ++i) {
+ ir_node *n = get_irn_out(curr_bl, i);
+ if (!is_allocatable_irn(n))
+ continue;
+ if (n != trigger && pu_get_new_color(pu, n) == col && phi_ops_interfere(irn, n))
+ obstack_ptr_grow(&confl_ob, n);
+ }
+
+ /* If irn lives out check i-dominated blocks where the irn lives in */
+ /* Fill the queue */
+ if (is_live_out(curr_bl, irn)) {
+ dominates_for_each(curr_bl, sub_bl)
+ if (is_live_in(sub_bl, irn)) {
+ obstack_ptr_grow(&q, sub_bl);
+ in++;
+ }
+ }
+ }
+ obstack_free(&q, NULL);
+ obstack_ptr_grow(&confl_ob, NULL);
+ confl = (ir_node **) obstack_finish(&confl_ob);
+ }
+
+ /* process all nodes which would conflict with this change */
+ for (i = 0, cn = confl[0]; cn; cn = confl[++i]) {
+ ir_node *sub_res;
+
+ /* try to color the conflicting node cn with the color of the irn itself */
+ DBG((dbgphi, LEVEL_3, "\t\t\t%n \t~~> %n := %d: Subcheck\n", trigger, irn, col));
+ sub_res = _pu_color_irn(pu, cn, irn_col, irn, changed_nodes);
+ if (sub_res != CHANGE_SAVE) {
+ res = sub_res;
+ goto ret_confl;
+ }
+ }
+ /* if we arrive here all sub changes can be applied, so it's save to change this irn */
+
+ret_save:
+ DBG((dbgphi, LEVEL_2, "\t\t\t%n \t~~> %n := %d: Save\n", trigger, irn, col));
+ obstack_free(&confl_ob, NULL);
+ pu_set_new_color(pu, irn, col);
+ obstack_ptr_grow(changed_nodes, irn);
+ return CHANGE_SAVE;
+
+ret_confl:
+ DBG((dbgphi, LEVEL_2, "\t\t\t%n \t~~> %n := %d: Conflict\n", trigger, irn, col));
+ obstack_free(&confl_ob, NULL);
+ return res;
}
+#define pu_color_irn(pu,irn,col,ob) _pu_color_irn(pu, irn, col, irn, ob)
/**
- * Sets the colors of members[i] to colors[i] as far as possible.
- * Each single change must be conflict free (checked by try_colors).
- * In some cases not all colors can be set.
+ * Tries to set as much members of a phi unit as possible to color @p col.
+ * All changes taken together are guaranteed to be conflict free.
*/
-static void set_colors(phi_unit_t *pu) {
- int i;
- int change_is_save, live_in_occured = 0;
+static int pu_try_color(phi_unit_t *pu, int col, int b_size) {
+ struct obstack ob_mis, ob_undo;
+ int i, redo, mis_size;
+ ir_node **mis;
+
+ /* first init pessimistically. Just return if we can't get a better result */
+ mis_size = 0;
+
+ obstack_init(&ob_mis);
+ obstack_init(&ob_undo);
+ redo = 1;
+ while (redo) {
+ redo = 0;
+ /* get a max independent set regarding current conflicts */
+ mis_size = pu_get_max_ind_set(pu, &ob_mis);
+ mis = obstack_finish(&ob_mis);
+
+ /* shortcut: if mis size is worse than best, then mis won't be better. */
+ if (mis_size < b_size)
+ goto ret;
- for (i = 0; i < pu->count; ++i)
- if (pu->colors[i] != NO_COLOR) {
- if (pu->is_live_in[i])
- live_in_occured = 1;
+ /* check if its possible to set the color for all members of the maximum set*/
+ for (i = 0; i < mis_size; ++i) {
+ ir_node *test_node, *confl_node;
- change_is_save = CHANGE_SAVE;
- if (live_in_occured)
- change_is_save = color_irn(pu->members[i], pu->colors[i], DRYRUN);
+ test_node = mis[i];
+ DBG((dbgphi, 1, "\t\t Testing %n\n", test_node));
+ confl_node = pu_color_irn(pu, test_node, col, &ob_undo);
- /* HINT: Dont change to == CHANGE_SAVE */
- if (change_is_save != CHANGE_IMPOSSIBLE) {
- DBG((dbgphi, 1, "\t\tSetting %n to %d\n", pu->members[i], pu->colors[i]));
- color_irn(pu->members[i], pu->colors[i], PERFORM);
+ if (confl_node == CHANGE_SAVE) {
+ if (!pset_find_ptr(free_nodes, test_node))
+ pu_pin_node(pu, test_node);
+ obstack_free(&ob_undo, obstack_finish(&ob_undo));
+ continue;
} else {
- DBG((dbgphi, 1, "\t\tConflict due to a live-in: %n\n", pu->members[i]));
+ int i;
+ ir_node *undo_node, **undo_nodes;
+
+ obstack_ptr_grow(&ob_undo, NULL);
+ undo_nodes = obstack_finish(&ob_undo);
+ for (i = 0, undo_node = undo_nodes[0]; undo_node; undo_node = undo_nodes[++i]) {
+ node_stat_t *ns = pu_find_node(pu, undo_node);
+ ns->color = ns->undo_color;
+ }
+ obstack_free(&ob_undo, undo_nodes);
+
+ if (is_conflicting_node(confl_node)) {
+ if (pu_is_node_pinned(pu, confl_node))
+ pu_add_conflict(pu, confl_node, test_node);
+ if (pset_find_ptr(pinned_global, confl_node))
+ pu_remove_node(pu, test_node);
+ }
}
+
+ /* shortcut: color not possible for phi node (phi comes first) ==> exit */
+ if (i == 0)
+ goto ret;
}
-}
+ obstack_free(&ob_mis, mis);
+ }
+ret:
+ obstack_free(&ob_undo, NULL);
+ obstack_free(&ob_mis, NULL);
+ return mis_size;
+}
/**
- * Tries to re-allocate colors of this phi-class, to achieve a lower number of
- * copies placed during phi destruction. Optimized version. Works only for
- * phi-classes/phi-units with exactly 1 phi node, which is the case for approx.
- * 80%.
+ * Tries to re-allocate colors of nodes in this phi unit, to achieve a lower
+ * number of copy instructions placed during phi destruction. Optimized version.
+ * Works only for phi-classes/phi-units with exactly 1 phi node, which is the
+ * case for approximately 80% of all phi units.
*/
-static void coalesce_1_phi(phi_unit_t *pu) {
- int *b_colors, b_size, b_changes, b_color;
- int i, col;
+static void pu_coalesce_1_phi(phi_unit_t *pu) {
+ int size, col, b_size, b_color;
+ set *b_changes;
/* init best search result */
- b_colors = malloc(pu->count * sizeof(*b_colors));
- for (i = 0; i < pu->count; ++i)
- b_colors[i] = NO_COLOR;
+ b_changes = NULL;
b_size = 0;
- b_changes = 0;
b_color = NO_COLOR;
/* find optimum of all colors */
for (col = MAX_COLORS-1; col >= 0; --col) {
DBG((dbgphi, 1, "\tTrying color %d\n", col));
- try_colors(pu, col, b_size, b_changes);
+ size = pu_try_color(pu, col, b_size);
/* did we find a better max ind. set? */
- if (pu->size > b_size || (pu->size == b_size && pu->changes < b_changes)) {
- b_size = pu->size;
- b_changes = pu->changes;
+ if (size > b_size) {
+ DBG((dbgphi, 1, "\t!! Better size: %d\n", size));
+ if (b_changes)
+ del_set(b_changes);
+ b_changes = pu->changed_nodes;
+ b_size = size;
b_color = col;
- memcpy(b_colors, pu->colors, pu->count * sizeof(*b_colors));
- DBG((dbgphi, 1, "\t!! Better size: %d Changes: %d\n", b_size, b_changes));
+ } else {
+ del_set(pu->changed_nodes);
}
- /* shortcut: if all members can be colored we are content and doubt that
- * reducing b_changes justifies all the further trying. */
- if (b_size == pu->count)
+ /* reset the phi unit to original state for next color */
+ pu->changed_nodes = new_set(set_cmp_node_stat_t, INITIAL_SLOTS_CHANGED_NODES);
+ pu->conflict_count = pu->conflict_count_org;
+
+ /* shortcut: if all members can be colored we are (very) content */
+ if (b_size == pu->node_count)
break;
}
/* now apply the found optimum */
- DBG((dbgphi, 1, "\tBest color: %d Copies: %d/%d Changes: %d\n", b_color, pu->count-b_size, pu->count, b_changes));
- pu->size = b_size;
- pu->changes = b_changes;
- memcpy(pu->colors, b_colors, pu->count * sizeof(*b_colors));
- set_colors(pu);
-
- free(b_colors);
+ if (b_changes) {
+ node_stat_t *ns;
+ DBG((dbgphi, 1, "\tBest color: %d Copies: %d/%d\n", b_color, pu->node_count-b_size, pu->node_count));
+ for (ns = set_first(b_changes); ns; ns = set_next(b_changes))
+ set_irn_color(ns->irn, ns->color);
+ free(b_changes);
+ } else {
+ DBG((dbgphi, 1, "\tBest color: none\n"));
+ }
}
/**
- * Tries to re-allocate colors of this phi-class, to achieve a lower number of
- * copies placed during phi destruction. General purpose version.
+ * Tries to re-allocate colors of nodes in this phi unit, to achieve a lower
+ * number of copy instructions placed during phi destruction.
+ * General purpose version.
*/
-static void coalesce_n_phi(phi_unit_t *pu) {
+static void pu_coalesce_n_phi(phi_unit_t *pu) {
DBG((dbgphi, 1, "\n"));
/* TODO */
}
/**
- * Prepare a phi class for further processing as a phi unit.
+ * Prepares a phi class for further processing as a phi unit.
+ * @param pc The phi class to prepare.
+ * @return A so called phi unit containing some prepared informations
+ * needed by the following coalescing phase.
*/
-static phi_unit_t *new_phi_unit(pset *pc) {
+static phi_unit_t *new_pu(pset *pc) {
phi_unit_t *pu;
ir_node *n, *phi = NULL;
- assert(pset_count(pc) <= MAX_PHI_CLS_SIZE && "Phi class too large!");
-
- pu = malloc(sizeof(*pu));
- pu->phi_count = 0;
+ /* get the phi count of this class */
+ pu = calloc(1, sizeof(*pu));
for (n = pset_first(pc); n; n = pset_next(pc))
if (is_Phi(n)) {
phi = n;
}
if (pu->phi_count == 1) {
- ir_node **tmp, *phi_block;
- int i, max;
+ ir_node **tmp;
+ int i, o;
struct obstack ob;
obstack_init(&ob);
/* build member set not containing phi interferers */
DBG((dbgphi, 1, "Phi-1 class:\n"));
- pu->count = 1; /*for the phi*/
+ pu->node_count = 1; /*for the phi*/
for (n = pset_first(pc); n; n = pset_next(pc)) {
if (is_Phi(n))
continue;
- if (!values_interfere(phi, n)) {
+ if (!phi_ops_interfere(phi, n)) {
DBG((dbgphi, 1, "\tAdding to members: %n\n", n));
obstack_ptr_grow(&ob, n);
- pu->count++;
+ pu->node_count++;
} else {
DBG((dbgphi, 1, "\tPhi interferer: %n\n", n));
pset_insert_ptr(free_nodes, n);
}
}
tmp = obstack_finish(&ob);
- pu->members = malloc(pu->count * sizeof(*pu->members));
- pu->members[0] = phi;
- memcpy(&pu->members[1], tmp, (pu->count-1) * sizeof(*tmp));
-
- /* init of colors array */
- pu->colors = malloc(pu->count * sizeof(*pu->colors));
-
- /* live-in analysis */
- /* HINT: It is possible that a node occurs twice as arg of a phi,
- * one time being live-in, and another time not being live-in.
- */
- pu->is_live_in = calloc(pu->count, sizeof(*pu->is_live_in));
- phi_block = get_nodes_block(phi);
- for (i = 0, max = get_irn_arity(phi); i < max; ++i) {
- int midx, o;
- ir_node *arg, *block_ith_pred;
-
- arg = get_irn_n(phi, i);
- block_ith_pred = get_nodes_block(get_irn_n(phi_block, i));
-
- /* find the arg in the members array */
- midx = -1;
- for (o = 0; o < pu->count; ++o)
- if (pu->members[o] == arg) {
- midx = o;
- break;
- }
- if (midx == -1)
- continue;
+ pu->nodes = malloc(pu->node_count * sizeof(*pu->nodes));
+ pu->nodes[0] = phi;
+ memcpy(&pu->nodes[1], tmp, (pu->node_count-1) * sizeof(*tmp));
- if (is_live_in(block_ith_pred, arg)) {
- pu->is_live_in[midx] |= 1;
- DBG((dbgphi, 1, "\t%n is live-in in %n\n", arg, block_ith_pred));
- }
- }
+ /* init conlict graph to life range interference */
+ for (i = 0; i < pu->node_count; ++i)
+ for (o = i+1; o < pu->node_count; ++o)
+ if (phi_ops_interfere(pu->nodes[i], pu->nodes[o]))
+ pu_add_conflict(pu, pu->nodes[i], pu->nodes[o]);
+ pu->conflict_count_org = pu->conflict_count;
+
+ pu->changed_nodes = new_set(set_cmp_node_stat_t, INITIAL_SLOTS_CHANGED_NODES);
obstack_free(&ob, NULL);
} else {
return pu;
}
+
/**
* Deletes a phi unit
*/
-static void free_phi_unit(phi_unit_t *pu) {
- DBG((dbgphi, 1, "\n"));
+static void free_pu(phi_unit_t *pu) {
if (pu->phi_count == 1) {
- free(pu->members);
- free(pu->colors);
- free(pu->is_live_in);
+ free(pu->nodes);
+ free(pu->changed_nodes);
+ if (pu->conflicts)
+ free(pu->conflicts);
} else {
/* TODO */
}
void be_phi_coalesce(pset *all_phi_classes) {
pset *pc;
- pinned_nodes = pset_new_ptr(256);
- free_nodes = pset_new_ptr(64);
+ pinned_global = pset_new_ptr(INITIAL_SLOTS_PINNED_GLOBAL);
+ free_nodes = pset_new_ptr(INITIAL_SLOTS_FREE_NODES);
for (pc = pset_first(all_phi_classes); pc; pc = pset_next(all_phi_classes)) {
- phi_unit_t *pu = new_phi_unit(pc);
+ phi_unit_t *pu = new_pu(pc);
if (pu->phi_count == 1)
- coalesce_1_phi(pu);
+ pu_coalesce_1_phi(pu);
else
- coalesce_n_phi(pu);
- free_phi_unit(pu);
+ pu_coalesce_n_phi(pu);
+ free_pu(pu);
}
del_pset(free_nodes);
- del_pset(pinned_nodes);
+ del_pset(pinned_global);
}
void be_phi_coal_init(void) {
- dbgphi = firm_dbg_register("Phi coalescing");
+ dbgphi = firm_dbg_register("ir.be.phicoal");
firm_dbg_set_mask(dbgphi, DEBUG_LVL);
}
projects / libfirm / blobdiff