/*
- * Project: libFIRM
- * File name: ir/opt/proc_cloning.c
- * Purpose: procedure cloning
- * Author: Beyhan Veliev
- * Created:
- * CVS-ID: $Id$
- * Copyright: (c) 1998-2005 Universität Karlsruhe
- * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ * This file is part of libFirm.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
/**
- * @file proc_cloning.c
+ * @file
+ * @brief Procedure cloning.
+ * @author Beyhan Veliev, Michael Beck
+ * @brief
*
+ * The purpose is first to find and analyze functions, that are called
+ * with constant parameter(s).
+ * The second step is to optimize the function that are found from our
+ * analyze. Optimize mean to make a new function with parameters, that
+ * aren't be constant. The constant parameters of the function are placed
+ * in the function graph. They aren't be passed as parameters.
*/
-#ifdef HAVE_CONFIG_H
#include "config.h"
-#endif
-#include <stdarg.h>
#include <string.h>
+#include "iroptimize.h"
#include "tv.h"
#include "set.h"
-#include "entity.h"
#include "irprog_t.h"
#include "hashptr.h"
#include "irgwalk.h"
-#include "proc_cloning.h"
#include "analyze_irg_args.h"
#include "irprintf.h"
-
-/* A macro to iterate sets.*/
-#define ITERATE_SET(set_entrys, entry) for(entry = set_first(set_entrys); entry; entry = set_next(set_entrys))
+#include "ircons.h"
+#include "irouts.h"
+#include "irnode_t.h"
+#include "irtools.h"
+#include "irgmod.h"
+#include "array_t.h"
+#include "irpass_t.h"
/**
- * This struct contains the information triple for a Call, which we need to
+ * This struct contains the information quadruple for a Call, which we need to
* decide if this function must be cloned.
*/
-typedef struct _entry {
- struct triple {
- entity *ent; /**< The entity of our Call. */
- int pos; /**< Position of a constant argument of our Call. */
- tarval *tv; /**< The tarval of this constant argument. */
- } t; /**< The heuristic triple. */
+typedef struct quadruple {
+ ir_entity *ent; /**< The entity of our Call. */
+ size_t pos; /**< Position of a constant argument of our Call. */
+ ir_tarval *tv; /**< The tarval of this argument if Const node. */
+ ir_node **calls; /**< The list of all calls with the same characteristics */
+} quadruple_t;
- unsigned num_calls; /**< number of calls */
- float weight; /**< The estimated weight of this triple. */
- struct _entry *next; /**< used for linking and sorting */
+/**
+ * The quadruplets are hold in a sorted list
+ */
+typedef struct entry {
+ quadruple_t q; /**< the quadruple */
+ float weight; /**< its weight */
+ struct entry *next; /**< link to the next one */
} entry_t;
+typedef struct q_set {
+ struct obstack obst; /**< an obstack containing all entries */
+ pset *map; /**< a hash map containing the quadruples */
+ entry_t *heavy_uses; /**< the ordered list of heavy uses */
+} q_set;
+
+/**
+ * Compare two quadruplets.
+ *
+ * @return zero if they are identically, non-zero else
+ */
+static int entry_cmp(const void *elt, const void *key)
+{
+ const entry_t *e1 = (const entry_t*)elt;
+ const entry_t *e2 = (const entry_t*)key;
+
+ return (e1->q.ent != e2->q.ent) || (e1->q.pos != e2->q.pos) || (e1->q.tv != e2->q.tv);
+}
+
/**
- * Compare two triples.
+ * Hash an element of type entry_t.
*
- * @return 0 if they are identically
+ * @param entry The element to be hashed.
*/
-static int entry_cmp(const void *elt, const void *key, size_t size)
+static unsigned hash_entry(const entry_t *entry)
{
- const entry_t *c1 = elt;
- const entry_t *c2 = key;
+ return hash_ptr(entry->q.ent) ^ hash_ptr(entry->q.tv) ^ (unsigned)(entry->q.pos * 9);
+}
- return (c1->t.ent != c2->t.ent) || (c1->t.pos != c2->t.pos) || (c1->t.tv != c2->t.tv);
+/**
+ * Free memory associated with a quadruplet.
+ */
+static void kill_entry(entry_t *entry)
+{
+ if (entry->q.calls) {
+ DEL_ARR_F(entry->q.calls);
+ entry->q.calls = NULL;
+ }
}
/**
- * Hash a element of typ entry_t
+ * Process a call node.
*
- * @param name A string (the name of the method)
- * @param length The length of this string
- * @param pos A integer value.
+ * @param call A ir_node to be checked.
+ * @param callee The entity of the callee
+ * @param hmap The quadruple-set containing the calls with constant parameters
*/
-static int hash_entry(const entry_t *entry)
+static void process_call(ir_node *call, ir_entity *callee, q_set *hmap)
{
- return HASH_PTR(entry->t.ent) ^ HASH_PTR(entry->t.tv) ^ (entry->t.pos * 9);
+ entry_t *key, *entry;
+ ir_node *call_param;
+ size_t i, n_params;
+
+ n_params = get_Call_n_params(call);
+
+ /* TODO
+ * Beware: we cannot clone variadic parameters as well as the
+ * last non-variadic one, which might be needed for the va_start()
+ * magic
+ */
+
+ /* In this for loop we collect the calls, that have
+ an constant parameter. */
+ for (i = n_params; i > 0;) {
+ call_param = get_Call_param(call, --i);
+ if (is_Const(call_param)) {
+ /* we have found a Call to collect and we save the informations,
+ which we need.*/
+ if (! hmap->map)
+ hmap->map = new_pset(entry_cmp, 8);
+
+ key = OALLOC(&hmap->obst, entry_t);
+
+ key->q.ent = callee;
+ key->q.pos = i;
+ key->q.tv = get_Const_tarval(call_param);
+ key->q.calls = NULL;
+ key->weight = 0.0F;
+ key->next = NULL;
+
+ /* We insert our information in the set, where we collect the calls.*/
+ entry = (entry_t*)pset_insert(hmap->map, key, hash_entry(key));
+
+ if (entry != key)
+ obstack_free(&hmap->obst, key);
+
+ /* add the call to the list */
+ if (! entry->q.calls) {
+ entry->q.calls = NEW_ARR_F(ir_node *, 1);
+ entry->q.calls[0] = call;
+ } else
+ ARR_APP1(ir_node *, entry->q.calls, call);
+ }
+ }
}
/**
- * Collect all calls in a ir_graph
- * to a set.
+ * Collect all calls in a ir_graph to a set.
*
* @param call A ir_node to be checked.
- * @param env The set where we will collect the calls.
+ * @param env The quadruple-set containing the calls with constant parameters
*/
static void collect_irg_calls(ir_node *call, void *env)
{
- set *entrys = env;
- ir_node *call_ptr;
- entity *call_ent;
- type *mtp;
- entry_t key, *entry;
- ir_node *call_param;
- int i, n_params;
-
- /* We collect just "Call" nodes*/
- if (get_irn_op(call) != op_Call)
- return;
-
- call_ptr = get_Call_ptr(call);
-
- /* Call pointer must be a symconst*/
- if (op_SymConst != get_irn_op(call_ptr))
- return;
- /* Call pointer must be the address of an entity.*/
- if (get_SymConst_kind(call_ptr) != symconst_addr_ent)
- return;
-
- call_ent = get_SymConst_entity(call_ptr);
-
- /* we can only clone calls to existing entities */
- if (get_entity_visibility(call_ent) == visibility_external_allocated)
- return;
-
- n_params = get_Call_n_params(call);
-
- /* beware: we cannot clone variadic parameters */
- mtp = get_Call_type(call);
- if (get_method_variadicity(mtp) != variadicity_non_variadic) {
- n_params = get_method_first_variadic_param_index(mtp);
- }
-
- /* In this for loop we collect the calls, that have
- an constant parameter. */
- for (i = n_params - 1; i >= 0; --i) {
- call_param = get_Call_param(call, i);
- if (is_Const(call_param)) {
- /* we have found a Call to collect and we save the informations,
- which we need.*/
- key.t.ent = call_ent;
- key.t.pos = i;
- key.t.tv = get_Const_tarval(call_param);
- key.num_calls = 0;
-
- /* We insert our information in the set, where we collect the calls.*/
- entry = set_insert(entrys, &key, sizeof(key), hash_entry(&key));
-
- /* we found one more */
- ++entry->num_calls;
- }
- }
+ q_set *hmap = (q_set*)env;
+ ir_node *call_ptr;
+ ir_entity *callee;
+
+ /* We collect just "Call" nodes */
+ if (is_Call(call)) {
+ call_ptr = get_Call_ptr(call);
+
+ if (! is_SymConst_addr_ent(call_ptr))
+ return;
+
+ callee = get_SymConst_entity(call_ptr);
+
+ /* we don't know which function gets finally bound to a weak symbol */
+ if (get_entity_linkage(callee) & IR_LINKAGE_WEAK)
+ return;
+
+ /* we can only clone calls to existing entities */
+ if (get_entity_irg(callee) == NULL)
+ return;
+
+ process_call(call, callee, hmap);
+ }
+}
+
+/**
+ * Make a name for a clone. The clone name is
+ * the name of the original method suffixed with "_cl_pos_nr".
+ * pos is the pos from our quadruplet and nr is a counter.
+ *
+ * @param id The ident of the cloned function.
+ * @param pos The "pos" from our quadruplet.
+ * @param nr A counter for the clones.
+ */
+static ident *get_clone_ident(ident *id, size_t pos, size_t nr)
+{
+ char clone_postfix[32];
+
+ ir_snprintf(clone_postfix, sizeof(clone_postfix), "_cl_%zu_%zu", pos, nr);
+
+ return id_mangle(id, new_id_from_str(clone_postfix));
+}
+
+/**
+ * Pre-Walker: Copies blocks and nodes from the original method graph
+ * to the cloned graph. Fixes the argument projection numbers for
+ * all arguments behind the removed one.
+ *
+ * @param irn A node from the original method graph.
+ * @param env The clone graph.
+ */
+static void copy_nodes(ir_node *irn, void *env)
+{
+ ir_graph *clone_irg = (ir_graph*)env;
+ ir_node *arg = (ir_node*)get_irg_link(clone_irg);
+ ir_node *irg_args = get_Proj_pred(arg);
+ ir_node *irn_copy;
+ long proj_nr;
+
+ /* Copy all nodes except the arg. */
+ if (irn != arg)
+ copy_irn_to_irg(irn, clone_irg);
+
+ irn_copy = (ir_node*)get_irn_link(irn);
+
+ /* Fix argument numbers */
+ if (is_Proj(irn) && get_Proj_pred(irn) == irg_args) {
+ proj_nr = get_Proj_proj(irn);
+ if (get_Proj_proj(arg) < proj_nr)
+ set_Proj_proj(irn_copy, proj_nr - 1);
+ }
+}
+
+/**
+ * Post-walker: Set the predecessors of the copied nodes.
+ * The copied nodes are set as link of their original nodes. The links of
+ * "irn" predecessors are the predecessors of copied node.
+ */
+static void set_preds(ir_node *irn, void *env)
+{
+ ir_graph *clone_irg = (ir_graph*)env;
+ ir_node *arg = (ir_node*)get_irg_link(clone_irg);
+ int i;
+ ir_node *irn_copy;
+ ir_node *pred;
+
+ /* Arg is the method argument, that we have replaced by a constant.*/
+ if (arg == irn)
+ return;
+
+ irn_copy = (ir_node*)get_irn_link(irn);
+
+ if (is_Block(irn)) {
+ ir_graph *const irg = get_Block_irg(irn);
+ for (i = get_Block_n_cfgpreds(irn) - 1; i >= 0; --i) {
+ pred = get_Block_cfgpred(irn, i);
+ /* "End" block must be handled extra, because it is not matured.*/
+ if (get_irg_end_block(irg) == irn)
+ add_immBlock_pred(get_irg_end_block(clone_irg), (ir_node*)get_irn_link(pred));
+ else
+ set_Block_cfgpred(irn_copy, i, (ir_node*)get_irn_link(pred));
+ }
+ } else {
+ /* First we set the block our copy if it is not a block.*/
+ set_nodes_block(irn_copy, (ir_node*)get_irn_link(get_nodes_block(irn)));
+ if (is_End(irn)) {
+ /* Handle the keep-alives. This must be done separately, because
+ the End node was NOT copied */
+ for (i = 0; i < get_End_n_keepalives(irn); ++i)
+ add_End_keepalive(irn_copy, (ir_node*)get_irn_link(get_End_keepalive(irn, i)));
+ } else {
+ for (i = get_irn_arity(irn) - 1; i >= 0; i--) {
+ pred = get_irn_n(irn, i);
+ set_irn_n(irn_copy, i, (ir_node*)get_irn_link(pred));
+ }
+ }
+ }
+}
+
+/**
+ * Get the method argument at the position "pos".
+ *
+ * @param irg irg that must be cloned.
+ * @param pos The position of the argument.
+ */
+static ir_node *get_irg_arg(ir_graph *irg, size_t pos)
+{
+ ir_node *irg_args = get_irg_args(irg), *arg = NULL;
+
+ /* Call algorithm that computes the out edges */
+ assure_irg_outs(irg);
+
+ /* Search the argument with the number pos.*/
+ for (unsigned i = get_irn_n_outs(irg_args); i-- > 0; ) {
+ ir_node *proj = get_irn_out(irg_args, i);
+ if ((int)pos == get_Proj_proj(proj)) {
+ if (arg) {
+ /*
+ * More than one arg node found:
+ * We rely on the fact that only one arg exists, so do
+ * a cheap CSE in this case.
+ */
+ set_irn_out(irg_args, i, arg, 0);
+ exchange(proj, arg);
+ } else
+ arg = proj;
+ }
+ }
+ assert(arg && "Argument not found");
+ return arg;
+}
+
+/**
+ * Create a new graph for the clone of the method,
+ * that we want to clone.
+ *
+ * @param ent The entity of the method that must be cloned.
+ * @param q Our quadruplet.
+ */
+static void create_clone_proc_irg(ir_entity *ent, const quadruple_t *q)
+{
+ ir_graph *method_irg, *clone_irg;
+ ir_node *arg, *const_arg;
+
+ method_irg = get_entity_irg(ent);
+
+ /* We create the skeleton of the clone irg.*/
+ clone_irg = new_ir_graph(ent, 0);
+
+ arg = get_irg_arg(get_entity_irg(q->ent), q->pos);
+ /* we will replace the argument in position "q->pos" by this constant. */
+ const_arg = new_r_Const(clone_irg, q->tv);
+
+ /* args copy in the cloned graph will be the const. */
+ set_irn_link(arg, const_arg);
+
+ /* Store the arg that will be replaced here, so we can easily detect it. */
+ set_irg_link(clone_irg, arg);
+
+ /* We copy the blocks and nodes, that must be in
+ the clone graph and set their predecessors. */
+ irg_walk_graph(method_irg, copy_nodes, set_preds, clone_irg);
+
+ /* The "cloned" graph must be matured. */
+ mature_immBlock(get_irg_end_block(clone_irg));
+ irg_finalize_cons(clone_irg);
+}
+
+/**
+ * The function create a new entity type
+ * for our clone and set it to clone entity.
+ *
+ * @param q Contains information for the method to clone.
+ * @param ent The entity of the clone.
+ * @param nr A pointer to the counter of clones.
+ **/
+static void change_entity_type(const quadruple_t *q, ir_entity *ent)
+{
+ ir_type *mtp, *new_mtp, *tp;
+ size_t i, j, n_params, n_ress;
+
+ mtp = get_entity_type(q->ent);
+ n_params = get_method_n_params(mtp);
+ n_ress = get_method_n_ress(mtp);
+
+ /* Create the new type for our clone. It must have one parameter
+ less then the original.*/
+ new_mtp = new_type_method(n_params - 1, n_ress);
+
+ /* We must set the type of the methods parameters.*/
+ for (i = j = 0; i < n_params; ++i) {
+ if (i == q->pos) {
+ /* This is the position of the argument, that we have
+ replaced. */
+ continue;
+ }
+ tp = get_method_param_type(mtp, i);
+ set_method_param_type(new_mtp, j++, tp);
+ }
+ /* Copy the methods result types. */
+ for (i = 0; i < n_ress; ++i) {
+ tp = get_method_res_type(mtp, i);
+ set_method_res_type(new_mtp, i, tp);
+ }
+ set_entity_type(ent, new_mtp);
+}
+
+/**
+ * Make a clone of a method.
+ *
+ * @param q Contains information for the method to clone.
+ */
+static ir_entity *clone_method(const quadruple_t *q)
+{
+ ir_entity *new_entity;
+ ident *clone_ident;
+ /* A counter for the clones.*/
+ static size_t nr = 0;
+
+ /* We get a new ident for our clone method.*/
+ clone_ident = get_clone_ident(get_entity_ident(q->ent), q->pos, nr);
+ /* We get our entity for the clone method. */
+ new_entity = copy_entity_name(q->ent, clone_ident);
+
+ /* a cloned entity is always local */
+ set_entity_visibility(new_entity, ir_visibility_local);
+
+ /* set a ld name here: Should we mangle this ? */
+ set_entity_ld_ident(new_entity, get_entity_ident(new_entity));
+
+ /* set a new type here. */
+ change_entity_type(q, new_entity);
+
+ /* We need now a new ir_graph for our clone method. */
+ create_clone_proc_irg(new_entity, q);
+
+ /* The "new_entity" don't have this information. */
+ new_entity->attr.mtd_attr.param_access = NULL;
+ new_entity->attr.mtd_attr.param_weight = NULL;
+
+ return new_entity;
+}
+
+/**
+ * Creates a new "cloned" Call node and return it.
+ *
+ * @param call The call that must be cloned.
+ * @param new_entity The entity of the cloned function.
+ * @param pos The position of the replaced parameter of this call.
+ **/
+static ir_node *new_cl_Call(ir_node *call, ir_entity *new_entity, size_t pos)
+{
+ ir_node **in;
+ size_t i, n_params, new_params = 0;
+ ir_node *callee;
+ symconst_symbol sym;
+ ir_graph *irg = get_irn_irg(call);
+ ir_node *bl = get_nodes_block(call);
+
+ sym.entity_p = new_entity;
+ callee = new_r_SymConst(irg, mode_P_code, sym, symconst_addr_ent);
+
+ n_params = get_Call_n_params(call);
+ NEW_ARR_A(ir_node *, in, n_params - 1);
+
+ /* we save the parameters of the new call in the array "in" without the
+ * parameter in position "pos", that is replaced with a constant.*/
+ for (i = 0; i < n_params; ++i) {
+ if (pos != i)
+ in[new_params++] = get_Call_param(call, i);
+ }
+ /* Create and return the new Call. */
+ return new_r_Call(bl, get_Call_mem(call),
+ callee, n_params - 1, in, get_entity_type(new_entity));
+}
+
+/**
+ * Exchange all Calls stored in the quadruplet to Calls of the cloned entity.
+ *
+ * @param q The quadruple
+ * @param cloned_ent The entity of the new function that must be called
+ * from the new Call.
+ */
+static void exchange_calls(quadruple_t *q, ir_entity *cloned_ent)
+{
+ size_t pos = q->pos;
+ ir_node *new_call, *call;
+ size_t i;
+
+ /* We iterate the list of the "call".*/
+ for (i = 0; i < ARR_LEN(q->calls); ++i) {
+ call = q->calls[i];
+
+ /* A clone exist and the copy of "call" in this
+ * clone graph must be exchanged with new one.*/
+ new_call = new_cl_Call(call, cloned_ent, pos);
+ exchange(call, new_call);
+ }
+}
+
+/**
+ * The weight formula:
+ * We save one instruction in every caller and param_weight instructions
+ * in the callee.
+ */
+static float calculate_weight(const entry_t *entry)
+{
+ return ARR_LEN(entry->q.calls) *
+ (float)(get_method_param_weight(entry->q.ent, entry->q.pos) + 1);
+}
+
+/**
+ * After we exchanged all calls, some entries on the list for
+ * the next cloned entity may get invalid, so we have to check
+ * them and may even update the list of heavy uses.
+ */
+static void reorder_weights(q_set *hmap, float threshold)
+{
+ entry_t **adr, *p, *entry;
+ size_t i, len;
+
+restart:
+ entry = hmap->heavy_uses;
+ if (! entry)
+ return;
+
+ len = ARR_LEN(entry->q.calls);
+ for (i = 0; i < len; ++i) {
+ ir_node *ptr, *call = entry->q.calls[i];
+
+ /* might be exchanged, so skip Id nodes here. */
+ call = skip_Id(call);
+
+ /* we know, that a SymConst is here */
+ ptr = get_Call_ptr(call);
+
+ ir_entity *const callee = get_SymConst_entity(ptr);
+ if (callee != entry->q.ent) {
+ /*
+ * This call is already changed because of a previous
+ * optimization. Remove it from the list.
+ */
+ --len;
+ entry->q.calls[i] = entry->q.calls[len];
+ entry->q.calls[len] = NULL;
+
+ /* the new call should be processed */
+ process_call(call, callee, hmap);
+ --i;
+ }
+ }
+
+ /* the length might be changed */
+ ARR_SHRINKLEN(entry->q.calls, len);
+
+ /* recalculate the weight and resort the heavy uses map */
+ entry->weight = calculate_weight(entry);
+
+ if (len <= 0 || entry->weight < threshold) {
+ hmap->heavy_uses = entry->next;
+ kill_entry(entry);
+
+ /* we have changed the list, check the next one */
+ goto restart;
+ }
+
+ adr = NULL;
+ for (p = entry->next; p && entry->weight < p->weight; p = p->next) {
+ adr = &p->next;
+ }
+
+ if (adr) {
+ hmap->heavy_uses = entry->next;
+ entry->next = *adr;
+ *adr = entry;
+
+ /* we have changed the list, check the next one */
+ goto restart;
+ }
}
/*
*/
void proc_cloning(float threshold)
{
- set *set_entrys;
- entry_t *entry, *p, *heavy_uses = NULL;
- ir_graph *irg;
- int i;
-
- set_entrys = new_set(entry_cmp, 8);
- entry = NULL;
-
- for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
- irg = get_irp_irg(i);
- irg_walk_graph(irg, collect_irg_calls, NULL, set_entrys);
- }
-
- /* We iterate the set and arrange the element of the set in a list.
- The elements are arranged dependent of their value descending.*/
- ITERATE_SET(set_entrys, entry) {
- entry->weight = entry->num_calls *
- (get_method_param_weight(entry->t.ent, entry->t.pos) + 1);
-
- /*
- * Do not put entry with a weight < threshold in the list
- */
- if (entry->weight < threshold)
- continue;
-
- /* put entry in the heavy uses list */
- entry->next = NULL;
- if (! heavy_uses)
- heavy_uses = entry;
- else {
- if (entry->weight >= heavy_uses->weight) {
- entry->next = heavy_uses;
- heavy_uses = entry;
- }
- else {
- for (p = heavy_uses; p->next; p = p->next) {
- if (entry->weight >= p->next->weight) {
- entry->next = p->next;
- p->next = entry;
- break;
- }
- }
- if (! p->next)
- p->next = entry;
- }
- }
- }
-
- /* Print some informations about the list. */
- for (entry = heavy_uses; entry; entry = entry->next) {
- printf("\nweight: is %f\n", entry->weight);
- ir_printf("Call for Method %E\n", entry->t.ent);
- printf("Position %i\n", entry->t.pos);
- ir_printf("Value %T\n", entry->t.tv);
- printf("Number of calls %u\n", entry->num_calls);
- printf("est. nodes %u\n", get_irg_estimated_node_cnt(get_entity_irg(entry->t.ent)));
- }
+ entry_t *p;
+ size_t i, n;
+ q_set hmap;
+
+ DEBUG_ONLY(firm_dbg_module_t *dbg;)
+
+ /* register a debug mask */
+ FIRM_DBG_REGISTER(dbg, "firm.opt.proc_cloning");
+
+ obstack_init(&hmap.obst);
+ hmap.map = NULL;
+ hmap.heavy_uses = NULL;
+
+ /* initially fill our map by visiting all irgs */
+ for (i = 0, n = get_irp_n_irgs(); i < n; ++i) {
+ ir_graph *irg = get_irp_irg(i);
+ irg_walk_graph(irg, collect_irg_calls, NULL, &hmap);
+ }
+
+ /* We have the "Call" nodes to optimize in set "set_entries". Our algorithm
+ replace one constant parameter and make a new "Call" node for all found "Calls". It exchange the
+ old one with the new one and the algorithm is called with the new "Call".
+ */
+ while (hmap.map || hmap.heavy_uses) {
+ /* We iterate the set and arrange the element of the set in a list.
+ The elements are arranged dependent of their value descending.*/
+ if (hmap.map) {
+ foreach_pset(hmap.map, entry_t, entry) {
+ entry->weight = calculate_weight(entry);
+
+ /*
+ * Do not put entry with a weight < threshold in the list
+ */
+ if (entry->weight < threshold) {
+ kill_entry(entry);
+ continue;
+ }
+
+ /* put entry in the heavy uses list */
+ entry->next = NULL;
+ if (! hmap.heavy_uses)
+ hmap.heavy_uses = entry;
+ else {
+ if (entry->weight >= hmap.heavy_uses->weight) {
+ entry->next = hmap.heavy_uses;
+ hmap.heavy_uses = entry;
+ } else {
+ for (p = hmap.heavy_uses; p->next; p = p->next) {
+ if (entry->weight >= p->next->weight) {
+ entry->next = p->next;
+ p->next = entry;
+ break;
+ }
+ }
+ if (! p->next)
+ p->next = entry;
+ }
+ }
+ }
+ del_pset(hmap.map);
+ hmap.map = NULL;
+ }
+
+#ifdef DEBUG_libfirm
+ /* Print some information about the list. */
+ DB((dbg, LEVEL_2, "-----------------\n"));
+ for (entry_t *entry = hmap.heavy_uses; entry; entry = entry->next) {
+ DB((dbg, LEVEL_2, "\nweight: is %f\n", entry->weight));
+ DB((dbg, LEVEL_2, "Call for Method %E\n", entry->q.ent));
+ DB((dbg, LEVEL_2, "Position %zu\n", entry->q.pos));
+ DB((dbg, LEVEL_2, "Value %T\n", entry->q.tv));
+ }
+#endif
+ entry_t *const entry = hmap.heavy_uses;
+ if (entry) {
+ quadruple_t *qp = &entry->q;
+
+ ir_entity *ent = clone_method(qp);
+ DB((dbg, LEVEL_1, "Cloned <%+F, %zu, %T> info %+F\n", qp->ent, qp->pos, qp->tv, ent));
+
+ hmap.heavy_uses = entry->next;
+
+ /* We must exchange the copies of this call in all clones too.*/
+ exchange_calls(&entry->q, ent);
+ kill_entry(entry);
+
+ /*
+ * after we exchanged all calls, some entries on the list for
+ * the next cloned entity may get invalid, so we have to check
+ * them and may even update the list of heavy uses.
+ */
+ reorder_weights(&hmap, threshold);
+ }
+ }
+ obstack_free(&hmap.obst, NULL);
+}
+
+typedef struct pass_t {
+ ir_prog_pass_t pass;
+ float threshold;
+} pass_t;
+
+/**
+ * Wrapper to run proc_cloning() as an ir_prog pass.
+ */
+static int proc_cloning_wrapper(ir_prog *irp, void *context)
+{
+ pass_t *pass = (pass_t*)context;
+
+ (void)irp;
+ proc_cloning(pass->threshold);
+ return 0;
+}
+
+/* create a ir_prog pass */
+ir_prog_pass_t *proc_cloning_pass(const char *name, float threshold)
+{
+ pass_t *pass = XMALLOCZ(pass_t);
+
+ pass->threshold = threshold;
+ return def_prog_pass_constructor(
+ &pass->pass, name ? name : "cloning", proc_cloning_wrapper);
}
projects / libfirm / blobdiff