/*
- * Project: libFIRM
- * File name: ir/opt/scalar_replace.c
- * Purpose: scalar replacement of arrays and compounds
- * Author: Beyhan
- * Created:
- * CVS-ID: $Id$
- * Copyright: (c) 1998-2005 Universität Karlsruhe
- * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved.
+ *
+ * This file is part of libFirm.
+ *
+ * This file may be distributed and/or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
+ *
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
*/
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-#include "irprog_t.h"
+/**
+ * @file
+ * @brief Scalar replacement of compounds.
+ * @author Beyhan Veliev, Michael Beck
+ */
+#include "config.h"
+
+#include <string.h>
+#include <stdbool.h>
+
+#include "iroptimize.h"
+#include "scalar_replace.h"
+#include "opt_init.h"
+#include "irflag_t.h"
+#include "irouts.h"
+#include "set.h"
+#include "pset.h"
+#include "array.h"
+#include "tv.h"
+#include "ircons_t.h"
+#include "hashptr.h"
+#include "irgwalk.h"
+#include "irgmod.h"
+#include "irnode_t.h"
+#include "irpass.h"
+#include "util.h"
+#include "xmalloc.h"
+#include "debug.h"
+#include "error.h"
+
+static unsigned get_vnum(const ir_node *node)
+{
+ return (unsigned)PTR_TO_INT(get_irn_link(node));
+}
+
+static void set_vnum(ir_node *node, unsigned vnum)
+{
+ set_irn_link(node, INT_TO_PTR(vnum));
+}
+
+/**
+ * A path element entry: it is either an entity
+ * or a tarval, because we evaluate only constant array
+ * accesses like a.b.c[8].d
+ */
+typedef union {
+ ir_entity *ent;
+ ir_tarval *tv;
+} path_elem_t;
+/**
+ * An access path, used to assign value numbers
+ * to variables that will be scalar replaced.
+ */
+typedef struct path_t {
+ unsigned vnum; /**< The value number. */
+ size_t path_len; /**< The length of the access path. */
+ path_elem_t path[1]; /**< The path. */
+} path_t;
+
+/** The size of a path in bytes. */
+static size_t path_size(path_t *p)
+{
+ return sizeof(*p) + sizeof(p->path[0]) * (p->path_len-1);
+}
+
+typedef struct scalars_t {
+ ir_entity *ent; /**< A entity for scalar replacement. */
+} scalars_t;
+
+DEBUG_ONLY(static firm_dbg_module_t *dbg;)
+
+/**
+ * Compare two pathes.
+ *
+ * @return 0 if they are identically
+ */
+static int path_cmp(const void *elt, const void *key, size_t size)
+{
+ const path_t *p1 = (const path_t*)elt;
+ const path_t *p2 = (const path_t*)key;
+ (void) size;
+
+ /* we can use memcmp here, because identical tarvals should have identical addresses */
+ return memcmp(p1->path, p2->path, p1->path_len * sizeof(p1->path[0]));
+}
+
+/**
+ * Compare two elements of the scalars_t set.
+ *
+ * @return 0 if they are identically
+ */
+static int ent_cmp(const void *elt, const void *key, size_t size)
+{
+ const scalars_t *c1 = (const scalars_t*)elt;
+ const scalars_t *c2 = (const scalars_t*)key;
+ (void) size;
+
+ return c1->ent != c2->ent;
+}
+
+/**
+ * Calculate a hash value for a path.
+ */
+static unsigned path_hash(const path_t *path)
+{
+ unsigned hash = 0;
+ unsigned i;
+
+ for (i = 0; i < path->path_len; ++i)
+ hash ^= (unsigned)PTR_TO_INT(path->path[i].ent);
+
+ return hash >> 4;
+}
+
+/**
+ * Returns non-zero, if all indeces of a Sel node are constants.
+ *
+ * @param sel the Sel node that will be checked
+ */
+static bool is_const_sel(ir_node *sel)
+{
+ int i, n = get_Sel_n_indexs(sel);
+
+ for (i = 0; i < n; ++i) {
+ ir_node *idx = get_Sel_index(sel, i);
+
+ if (!is_Const(idx))
+ return false;
+ }
+ return true;
+}
+
+/**
+ * Check the mode of a Load/Store with the mode of the entity
+ * that is accessed.
+ * If the mode of the entity and the Load/Store mode do not match, we
+ * have the bad reinterpret case:
+ *
+ * int i;
+ * char b = *(char *)&i;
+ *
+ * We do NOT count this as one value and return address_taken
+ * in that case.
+ * However, we support an often used case. If the mode is two-complement
+ * we allow casts between signed/unsigned.
+ *
+ * @param mode the mode of the Load/Store
+ * @param ent_mode the mode of the accessed entity
+ */
+static bool check_load_store_mode(ir_mode *mode, ir_mode *ent_mode)
+{
+ if (ent_mode != mode) {
+ if (ent_mode == NULL ||
+ get_mode_size_bits(ent_mode) != get_mode_size_bits(mode) ||
+ get_mode_arithmetic(ent_mode) != irma_twos_complement ||
+ get_mode_arithmetic(mode) != irma_twos_complement)
+ return false;
+ }
+ return true;
+}
/*
- * find possible scalar replacements
+ * Returns non-zero, if the address of an entity
+ * represented by a Sel node (or its successor Sels) is taken.
+ */
+bool is_address_taken(ir_node *sel)
+{
+ int i, input_nr, k;
+ ir_mode *emode, *mode;
+ ir_node *value;
+ ir_entity *ent;
+
+ if (! is_const_sel(sel))
+ return true;
+
+ for (i = get_irn_n_outs(sel) - 1; i >= 0; --i) {
+ ir_node *succ = get_irn_out(sel, i);
+
+ switch (get_irn_opcode(succ)) {
+ case iro_Load:
+ /* do not remove volatile variables */
+ if (get_Load_volatility(succ) == volatility_is_volatile)
+ return true;
+ /* check if this load is not a hidden conversion */
+ mode = get_Load_mode(succ);
+ ent = get_Sel_entity(sel);
+ emode = get_type_mode(get_entity_type(ent));
+ if (! check_load_store_mode(mode, emode))
+ return true;
+ break;
+
+ case iro_Store:
+ /* check that Sel is not the Store's value */
+ value = get_Store_value(succ);
+ if (value == sel)
+ return true;
+ /* do not remove volatile variables */
+ if (get_Store_volatility(succ) == volatility_is_volatile)
+ return true;
+ /* check if this Store is not a hidden conversion */
+ mode = get_irn_mode(value);
+ ent = get_Sel_entity(sel);
+ emode = get_type_mode(get_entity_type(ent));
+ if (! check_load_store_mode(mode, emode))
+ return true;
+ break;
+
+ case iro_Sel: {
+ int res;
+ ir_entity *entity = get_Sel_entity(succ);
+ /* we can't handle unions correctly yet -> address taken */
+ if (is_Union_type(get_entity_owner(entity)))
+ return true;
+
+ /* Check the Sel successor of Sel */
+ res = is_address_taken(succ);
+ if (res)
+ return true;
+ break;
+ }
+
+ case iro_Call:
+ /* The address of an entity is given as a parameter.
+ * As long as we do not have analyses that can tell what
+ * is done with parameters, think is taken.
+ * One special case: If the Call type tells that it's a
+ * value parameter, the address is NOT taken.
+ */
+ return true;
+
+ case iro_Id: {
+ int res = is_address_taken(succ);
+ if (res)
+ return true;
+ break;
+ }
+
+ case iro_Tuple:
+ /* Non-optimized Tuple, happens in inlining */
+ for (input_nr = get_Tuple_n_preds(succ) - 1; input_nr >= 0; --input_nr) {
+ ir_node *pred = get_Tuple_pred(succ, input_nr);
+
+ if (pred == sel) {
+ /* we found one input */
+ for (k = get_irn_n_outs(succ) - 1; k >= 0; --k) {
+ ir_node *proj = get_irn_out(succ, k);
+
+ if (is_Proj(proj) && get_Proj_proj(proj) == input_nr) {
+ int res = is_address_taken(proj);
+ if (res)
+ return true;
+ }
+ }
+ }
+ }
+ break;
+
+ default:
+ /* another op, the address is taken */
+ return true;
+ }
+ }
+ return false;
+}
+
+/**
+ * Link all leave Sels with the entity.
+ *
+ * @param ent the entity that will be scalar replaced
+ * @param sel a Sel node that selects some fields of this entity
+ */
+static bool link_all_leave_sels(ir_entity *ent, ir_node *sel)
+{
+ int i;
+ bool is_leave = true;
+
+ for (i = get_irn_n_outs(sel) - 1; i >= 0; --i) {
+ ir_node *succ = get_irn_out(sel, i);
+
+ if (is_Sel(succ)) {
+ /* the current leave has further Sel's, no leave */
+ is_leave = false;
+ link_all_leave_sels(ent, succ);
+ } else if (is_Id(succ)) {
+ is_leave &= link_all_leave_sels(ent, succ);
+ }
+ }
+
+ if (is_leave) {
+ /* beware of Id's */
+ sel = skip_Id(sel);
+
+ /* we know we are at a leave, because this function is only
+ * called if the address is NOT taken, so sel's successor(s)
+ * must be Loads or Stores
+ */
+ set_irn_link(sel, get_entity_link(ent));
+ set_entity_link(ent, sel);
+ }
+ return is_leave;
+}
+
+/* we need a special address that serves as an address taken marker */
+static char _x;
+static void *ADDRESS_TAKEN = &_x;
+
+/**
+ * Find possible scalar replacements.
+ *
+ * @param irg an IR graph
+ *
+ * This function finds variables on the (members of the) frame type
+ * that can be scalar replaced, because their address is never taken.
+ * If such a variable is found, its entity link will hold a list of all
+ * Sel nodes, that selects the atomic fields of this entity.
+ * Otherwise, the link will be ADDRESS_TAKEN or NULL.
+ *
+ * @return non-zero if at least one entity could be replaced
+ * potentially
+ */
+static int find_possible_replacements(ir_graph *irg)
+{
+ ir_node *irg_frame;
+ ir_type *frame_tp;
+ size_t mem_idx;
+ int i;
+ long static_link_arg;
+ int res = 0;
+
+ /*
+ * First, clear the link field of all interesting entities.
+ */
+ frame_tp = get_irg_frame_type(irg);
+ for (mem_idx = get_class_n_members(frame_tp); mem_idx > 0;) {
+ ir_entity *ent = get_class_member(frame_tp, --mem_idx);
+ set_entity_link(ent, NULL);
+ }
+
+ /* check for inner functions:
+ * FIXME: need a way to get the argument position for the static link */
+ static_link_arg = 0;
+ for (mem_idx = get_class_n_members(frame_tp); mem_idx > 0;) {
+ ir_entity *ent = get_class_member(frame_tp, --mem_idx);
+ if (is_method_entity(ent)) {
+ ir_graph *inner_irg = get_entity_irg(ent);
+ ir_node *args;
+ int j;
+
+ assure_irg_properties(inner_irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
+ args = get_irg_args(inner_irg);
+ for (j = get_irn_n_outs(args) - 1; j >= 0; --j) {
+ ir_node *arg = get_irn_out(args, j);
+
+ if (get_Proj_proj(arg) == static_link_arg) {
+ int k;
+ for (k = get_irn_n_outs(arg) - 1; k >= 0; --k) {
+ ir_node *succ = get_irn_out(arg, k);
+
+ if (is_Sel(succ)) {
+ ir_entity *ent = get_Sel_entity(succ);
+
+ if (get_entity_owner(ent) == frame_tp) {
+ /* found an access to the outer frame */
+ set_entity_link(ent, ADDRESS_TAKEN);
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ /*
+ * Check the ir_graph for Sel nodes. If the entity of Sel
+ * isn't a scalar replacement set the link of this entity
+ * equal ADDRESS_TAKEN.
+ */
+ irg_frame = get_irg_frame(irg);
+ for (i = get_irn_n_outs(irg_frame) - 1; i >= 0; --i) {
+ ir_node *succ = get_irn_out(irg_frame, i);
+
+ if (is_Sel(succ)) {
+ ir_entity *ent = get_Sel_entity(succ);
+ ir_type *ent_type;
+
+ /* we are only interested in entities on the frame, NOT
+ on the value type */
+ if (get_entity_owner(ent) != frame_tp)
+ continue;
+
+ if (get_entity_link(ent) == ADDRESS_TAKEN)
+ continue;
+
+ ent_type = get_entity_type(ent);
+
+ /* we can handle arrays, structs and atomic types yet */
+ if (is_Array_type(ent_type) || is_Struct_type(ent_type) || is_atomic_type(ent_type)) {
+ if (is_address_taken(succ)) {
+ /* killing one */
+ if (get_entity_link(ent))
+ --res;
+ set_entity_link(ent, ADDRESS_TAKEN);
+ } else {
+ /* possible found one */
+ if (get_entity_link(ent) == NULL)
+ ++res;
+ link_all_leave_sels(ent, succ);
+ }
+ }
+ }
+ }
+
+ return res;
+}
+
+/**
+ * Return a path from the Sel node "sel" to its root.
+ *
+ * @param sel the Sel node
+ * @param len the length of the path so far
*/
-void find_scalar_replacements(ir_graph *irg)
+static path_t *find_path(ir_node *sel, size_t len)
+{
+ size_t pos;
+ int i, n;
+ path_t *res;
+ ir_node *pred = get_Sel_ptr(sel);
+
+ /* the current Sel node will add some path elements */
+ n = get_Sel_n_indexs(sel);
+ len += n + 1;
+
+ if (! is_Sel(pred)) {
+ /* we found the root */
+ res = XMALLOCF(path_t, path, len);
+ res->path_len = len;
+ } else
+ res = find_path(pred, len);
+
+ assert(len <= res->path_len);
+ pos = res->path_len - len;
+
+ res->path[pos++].ent = get_Sel_entity(sel);
+ for (i = 0; i < n; ++i) {
+ ir_node *index = get_Sel_index(sel, i);
+
+ res->path[pos++].tv = get_Const_tarval(index);
+ }
+ return res;
+}
+
+
+/**
+ * Allocate value numbers for the leaves
+ * in our found entities.
+ *
+ * @param sels a set that will contain all Sels that have a value number
+ * @param ent the entity that will be scalar replaced
+ * @param vnum the first value number we can assign
+ * @param modes a flexible array, containing all the modes of
+ * the value numbers.
+ *
+ * @return the next free value number
+ */
+static unsigned allocate_value_numbers(pset *sels, ir_entity *ent, unsigned vnum, ir_mode ***modes)
+{
+ ir_node *sel, *next;
+ path_t *key, *path;
+ set *pathes = new_set(path_cmp, 8);
+
+ DB((dbg, SET_LEVEL_3, " Visiting Sel nodes of entity %+F\n", ent));
+ /* visit all Sel nodes in the chain of the entity */
+ for (sel = (ir_node*)get_entity_link(ent); sel != NULL; sel = next) {
+ next = (ir_node*)get_irn_link(sel);
+
+ /* we must mark this sel for later */
+ pset_insert_ptr(sels, sel);
+
+ key = find_path(sel, 0);
+ path = set_find(path_t, pathes, key, path_size(key), path_hash(key));
+
+ if (path) {
+ set_vnum(sel, path->vnum);
+ DB((dbg, SET_LEVEL_3, " %+F represents value %u\n", sel, path->vnum));
+ } else {
+ key->vnum = vnum++;
+
+ set_insert(path_t, pathes, key, path_size(key), path_hash(key));
+
+ set_vnum(sel, key->vnum);
+ DB((dbg, SET_LEVEL_3, " %+F represents value %u\n", sel, key->vnum));
+
+ ARR_EXTO(ir_mode *, *modes, (key->vnum + 15) & ~15);
+
+ (*modes)[key->vnum] = get_type_mode(get_entity_type(get_Sel_entity(sel)));
+
+ assert((*modes)[key->vnum] && "Value is not atomic");
+
+#ifdef DEBUG_libfirm
+ /* Debug output */
+ {
+ unsigned i;
+ DB((dbg, SET_LEVEL_2, " %s", get_entity_name(key->path[0].ent)));
+ for (i = 1; i < key->path_len; ++i) {
+ if (is_entity(key->path[i].ent))
+ DB((dbg, SET_LEVEL_2, ".%s", get_entity_name(key->path[i].ent)));
+ else
+ DB((dbg, SET_LEVEL_2, "[%ld]", get_tarval_long(key->path[i].tv)));
+ }
+ DB((dbg, SET_LEVEL_2, " = %u (%s)\n", PTR_TO_INT(get_irn_link(sel)), get_mode_name((*modes)[key->vnum])));
+ }
+#endif /* DEBUG_libfirm */
+ }
+ free(key);
+ }
+
+ del_set(pathes);
+ set_entity_link(ent, NULL);
+ return vnum;
+}
+
+/**
+ * environment for memory walker
+ */
+typedef struct env_t {
+ unsigned nvals; /**< number of values */
+ ir_mode **modes; /**< the modes of the values */
+ pset *sels; /**< A set of all Sel nodes that have a value number */
+} env_t;
+
+/**
+ * topological post-walker.
+ */
+static void walker(ir_node *node, void *ctx)
+{
+ env_t *env = (env_t*)ctx;
+ ir_graph *irg = get_irn_irg(node);
+ ir_node *addr, *block, *mem, *val;
+ ir_mode *mode;
+ unsigned vnum;
+
+ if (is_Load(node)) {
+ /* a load, check if we can resolve it */
+ addr = get_Load_ptr(node);
+
+ DB((dbg, SET_LEVEL_3, " checking %+F for replacement ", node));
+ if (! is_Sel(addr)) {
+ DB((dbg, SET_LEVEL_3, "no Sel input (%+F)\n", addr));
+ return;
+ }
+
+ if (! pset_find_ptr(env->sels, addr)) {
+ DB((dbg, SET_LEVEL_3, "Sel %+F has no VNUM\n", addr));
+ return;
+ }
+
+ /* ok, we have a Load that will be replaced */
+ vnum = get_vnum(addr);
+ assert(vnum < env->nvals);
+
+ DB((dbg, SET_LEVEL_3, "replacing by value %u\n", vnum));
+
+ block = get_nodes_block(node);
+ set_cur_block(block);
+
+ /* check, if we can replace this Load */
+ val = get_value(vnum, env->modes[vnum]);
+
+ /* Beware: A Load can contain a hidden conversion in Firm.
+ This happens for instance in the following code:
+
+ int i;
+ unsigned j = *(unsigned *)&i;
+
+ Handle this here. */
+ mode = get_Load_mode(node);
+ if (mode != get_irn_mode(val))
+ val = new_rd_Conv(get_irn_dbg_info(node), block, val, mode);
+
+ mem = get_Load_mem(node);
+ turn_into_tuple(node, pn_Load_max+1);
+ set_Tuple_pred(node, pn_Load_M, mem);
+ set_Tuple_pred(node, pn_Load_res, val);
+ set_Tuple_pred(node, pn_Load_X_regular, new_r_Jmp(block));
+ set_Tuple_pred(node, pn_Load_X_except, new_r_Bad(irg, mode_X));
+ } else if (is_Store(node)) {
+ DB((dbg, SET_LEVEL_3, " checking %+F for replacement ", node));
+
+ /* a Store always can be replaced */
+ addr = get_Store_ptr(node);
+
+ if (! is_Sel(addr)) {
+ DB((dbg, SET_LEVEL_3, "no Sel input (%+F)\n", addr));
+ return;
+ }
+
+ if (! pset_find_ptr(env->sels, addr)) {
+ DB((dbg, SET_LEVEL_3, "Sel %+F has no VNUM\n", addr));
+ return;
+ }
+
+ vnum = get_vnum(addr);
+ assert(vnum < env->nvals);
+
+ DB((dbg, SET_LEVEL_3, "replacing by value %u\n", vnum));
+
+ block = get_nodes_block(node);
+ set_cur_block(block);
+
+ /* Beware: A Store can contain a hidden conversion in Firm. */
+ val = get_Store_value(node);
+ if (get_irn_mode(val) != env->modes[vnum])
+ val = new_rd_Conv(get_irn_dbg_info(node), block, val, env->modes[vnum]);
+
+ set_value(vnum, val);
+
+ mem = get_Store_mem(node);
+ turn_into_tuple(node, pn_Store_max+1);
+ set_Tuple_pred(node, pn_Store_M, mem);
+ set_Tuple_pred(node, pn_Store_X_regular, new_r_Jmp(block));
+ set_Tuple_pred(node, pn_Store_X_except, new_r_Bad(irg, mode_X));
+ }
+}
+
+/**
+ * Make scalar replacement.
+ *
+ * @param sels A set containing all Sel nodes that have a value number
+ * @param nvals The number of scalars.
+ * @param modes A flexible array, containing all the modes of
+ * the value numbers.
+ */
+static void do_scalar_replacements(ir_graph *irg, pset *sels, unsigned nvals,
+ ir_mode **modes)
+{
+ env_t env;
+
+ ssa_cons_start(irg, (int)nvals);
+
+ env.nvals = nvals;
+ env.modes = modes;
+ env.sels = sels;
+
+ /*
+ * second step: walk over the graph blockwise in topological order
+ * and fill the array as much as possible.
+ */
+ DB((dbg, SET_LEVEL_3, "Substituting Loads and Stores in %+F\n", irg));
+ irg_walk_blkwise_graph(irg, NULL, walker, &env);
+
+ ssa_cons_finish(irg);
+}
+
+/*
+ * Find possible scalar replacements
+ *
+ * @param irg The current ir graph.
+ */
+void scalar_replacement_opt(ir_graph *irg)
+{
+ unsigned nvals;
+ int i;
+ scalars_t key;
+ ir_node *irg_frame;
+ ir_mode **modes;
+ set *set_ent;
+ pset *sels;
+ ir_type *ent_type, *frame_tp;
+
+ assure_irg_properties(irg,
+ IR_GRAPH_PROPERTY_NO_UNREACHABLE_CODE
+ | IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
+
+ /* we use the link field to store the VNUM */
+ ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
+ irp_reserve_resources(irp, IRP_RESOURCE_ENTITY_LINK);
+
+ /* Find possible scalar replacements */
+ if (find_possible_replacements(irg)) {
+ DB((dbg, SET_LEVEL_1, "Scalar Replacement: %+F\n", irg));
+
+ /* Insert in set the scalar replacements. */
+ irg_frame = get_irg_frame(irg);
+ nvals = 0;
+ modes = NEW_ARR_F(ir_mode *, 16);
+ set_ent = new_set(ent_cmp, 8);
+ sels = pset_new_ptr(8);
+ frame_tp = get_irg_frame_type(irg);
+
+ for (i = get_irn_n_outs(irg_frame) - 1; i >= 0; --i) {
+ ir_node *succ = get_irn_out(irg_frame, i);
+
+ if (is_Sel(succ)) {
+ ir_entity *ent = get_Sel_entity(succ);
+
+ /* we are only interested in entities on the frame, NOT
+ parameters */
+ if (get_entity_owner(ent) != frame_tp
+ || is_parameter_entity(ent))
+ continue;
+
+ if (get_entity_link(ent) == NULL || get_entity_link(ent) == ADDRESS_TAKEN)
+ continue;
+
+ ent_type = get_entity_type(ent);
+
+ key.ent = ent;
+ set_insert(scalars_t, set_ent, &key, sizeof(key), hash_ptr(key.ent));
+
+#ifdef DEBUG_libfirm
+ if (is_Array_type(ent_type)) {
+ DB((dbg, SET_LEVEL_1, " found array %s\n", get_entity_name(ent)));
+ } else if (is_Struct_type(ent_type)) {
+ DB((dbg, SET_LEVEL_1, " found struct %s\n", get_entity_name(ent)));
+ } else if (is_atomic_type(ent_type))
+ DB((dbg, SET_LEVEL_1, " found atomic value %s\n", get_entity_name(ent)));
+ else {
+ panic("Neither an array nor a struct or atomic value found in scalar replace");
+ }
+#endif /* DEBUG_libfirm */
+
+ nvals = allocate_value_numbers(sels, ent, nvals, &modes);
+ }
+ }
+
+ DB((dbg, SET_LEVEL_1, " %u values will be needed\n", nvals));
+
+ /* If scalars were found. */
+ if (nvals > 0) {
+ do_scalar_replacements(irg, sels, nvals, modes);
+
+ foreach_set(set_ent, scalars_t, value) {
+ free_entity(value->ent);
+ }
+
+ /*
+ * We changed the graph, but did NOT introduce new blocks
+ * neither changed control flow, cf-backedges should be still
+ * consistent.
+ */
+ }
+ del_pset(sels);
+ del_set(set_ent);
+ DEL_ARR_F(modes);
+ }
+
+ ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
+ irp_free_resources(irp, IRP_RESOURCE_ENTITY_LINK);
+
+ confirm_irg_properties(irg, IR_GRAPH_PROPERTIES_NONE);
+}
+
+ir_graph_pass_t *scalar_replacement_opt_pass(const char *name)
+{
+ return def_graph_pass(name ? name : "scalar_rep", scalar_replacement_opt);
+}
+
+void firm_init_scalar_replace(void)
{
+ FIRM_DBG_REGISTER(dbg, "firm.opt.scalar_replace");
}
projects / libfirm / blobdiff