* Copyright: (c) 1998-2004 Universit\81ät Karlsruhe
* Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
*/
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef HAVE_ALLOCA_H
+#include <alloca.h>
+#endif
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+
# include "irnode_t.h"
# include "irgraph_t.h"
# include "irmode_t.h"
# include "iropt_dbg.h"
# include "irflag_t.h"
# include "array.h"
-# include "firmstat.h"
+# include "irhooks.h"
#undef IMAX
#define IMAX(a,b) ((a) > (b) ? (a) : (b))
int changes;
} walk_env_t;
+/**
+ * flags for Load/Store
+ */
+enum ldst_flags_t {
+ LDST_VISITED = 1 /**< if set, this Load/Store is already visited */
+};
+
/**
* a Load/Store info
*/
typedef struct _ldst_info_t {
- ir_node *projs[MAX_PROJ]; /**< list of Proj's of this node */
- ir_node *exc_block; /**< the exception block if available */
- int exc_idx; /**< predecessor index in the exception block */
+ ir_node *projs[MAX_PROJ]; /**< list of Proj's of this node */
+ ir_node *exc_block; /**< the exception block if available */
+ int exc_idx; /**< predecessor index in the exception block */
+ unsigned flags; /**< flags */
} ldst_info_t;
/**
*/
static void collect_nodes(ir_node *node, void *env)
{
+ ir_op *op = get_irn_op(node);
ir_node *pred;
ldst_info_t *ldst_info;
walk_env_t *wenv = env;
- if (get_irn_op(node) == op_Proj) {
+ if (op == op_Proj) {
ir_node *adr;
ir_op *op;
op = get_irn_op(pred);
if (op == op_Load) {
- adr = get_Load_ptr(pred);
ldst_info = get_ldst_info(pred, wenv);
wenv->changes |= update_projs(ldst_info, node);
- set_irn_out_n(adr, get_irn_out_n(adr) + 1);
+ if ((ldst_info->flags & LDST_VISITED) == 0) {
+ adr = get_Load_ptr(pred);
+ set_irn_out_n(adr, get_irn_out_n(adr) + 1);
+
+ ldst_info->flags |= LDST_VISITED;
+ }
}
else if (op == op_Store) {
- adr = get_Store_ptr(pred);
ldst_info = get_ldst_info(pred, wenv);
wenv->changes |= update_projs(ldst_info, node);
- set_irn_out_n(adr, get_irn_out_n(adr) + 1);
+ if ((ldst_info->flags & LDST_VISITED) == 0) {
+ adr = get_Store_ptr(pred);
+ set_irn_out_n(adr, get_irn_out_n(adr) + 1);
+
+ ldst_info->flags |= LDST_VISITED;
+ }
}
}
- else if (get_irn_op(node) == op_Block) { /* check, if it's an exception block */
+ else if (op == op_Block) { /* check, if it's an exception block */
int i, n;
for (i = 0, n = get_Block_n_cfgpreds(node); i < n; ++i) {
}
}
+/**
+ * returns a entity if the address ptr points to a constant one.
+ */
+static entity *find_constant_entity(ir_node *ptr)
+{
+ for (;;) {
+ ir_op *op = get_irn_op(ptr);
+
+ if (op == op_SymConst && (get_SymConst_kind(ptr) == symconst_addr_ent)) {
+ return get_SymConst_entity(ptr);
+ }
+ else if (op == op_Sel) {
+ entity *ent = get_Sel_entity(ptr);
+ type *tp = get_entity_owner(ent);
+
+ if (is_Array_type(tp)) {
+ /* check bounds */
+ int i, n;
+
+ for (i = 0, n = get_Sel_n_indexs(ptr); i < n; ++i) {
+ ir_node *bound;
+ tarval *tlower, *tupper;
+ ir_node *index = get_Sel_index(ptr, i);
+ tarval *tv = computed_value(index);
+
+ /* check if the index is constant */
+ if (tv == tarval_bad)
+ return NULL;
+
+ bound = get_array_lower_bound(tp, i);
+ tlower = computed_value(bound);
+ bound = get_array_upper_bound(tp, i);
+ tupper = computed_value(bound);
+
+ if (tlower == tarval_bad || tupper == tarval_bad)
+ return NULL;
+
+ if (tarval_cmp(tv, tlower) & Lt)
+ return NULL;
+ if (tarval_cmp(tupper, tv) & Lt)
+ return NULL;
+
+ /* ok, bounds check finished */
+ }
+ }
+
+ /* try next */
+ ptr = get_Sel_ptr(ptr);
+ }
+ else
+ return NULL;
+ }
+}
+
/**
* optimize a Load
*/
ldst_info_t *info = get_irn_link(load);
ir_mode *load_mode = get_Load_mode(load);
ir_node *pred, *mem, *ptr;
+ entity *ent;
int res = 0;
/* the address of the load to be optimized */
/* the mem of the Load. Must still be returned after optimization */
mem = get_Load_mem(load);
- if ((get_irn_opcode(ptr) == iro_SymConst) && (get_SymConst_kind(ptr) == symconst_addr_ent)) {
- entity *ent = get_SymConst_entity(ptr);
-
- assert(mode_is_reference(get_irn_mode(ptr)));
-
+ /* check if we can determine the entity that will be loaded */
+ ent = find_constant_entity(ptr);
+ if (ent) {
if ((allocation_static == get_entity_allocation(ent)) &&
(visibility_external_allocated != get_entity_visibility(ent))) {
/* a static allocation that is not external: there should be NO exception
exchange(info->projs[pn_Load_M], mem);
/* no result :-) */
- if (info->projs[pn_Load_res])
- exchange(info->projs[pn_Load_res], copy_const_value(get_atomic_ent_value(ent)));
+ if (info->projs[pn_Load_res]) {
+ if (is_atomic_entity(ent)) {
+ ir_node *c = copy_const_value(get_atomic_ent_value(ent));
- return 1;
+ DBG_OPT_RC(load, c);
+ exchange(info->projs[pn_Load_res], c);
+
+ return 1;
+ }
+ }
+ }
+ else if (variability_constant == get_entity_variability(ent)) {
+ printf(">>>>>>>>>>>>> Found access to constant entity %s in function %s\n", get_entity_name(ent),
+ get_entity_name(get_irg_entity(current_ir_graph)));
}
/* we changed the irg, but try further */
*/
if ((!pred_info->projs[pn_Store_X_except] && !info->projs[pn_Load_X_except]) ||
get_nodes_block(load) == get_nodes_block(pred)) {
- DBG_OPT_RAW(pred, load);
+ DBG_OPT_RAW(load, pred);
exchange( info->projs[pn_Load_res], get_Store_value(pred) );
if (info->projs[pn_Load_M])
if (! info->projs[pn_Load_X_except] || get_nodes_block(load) == get_nodes_block(pred)) {
ldst_info_t *pred_info = get_irn_link(pred);
- DBG_OPT_RAR(pred, load);
+ DBG_OPT_RAR(load, pred);
if (pred_info->projs[pn_Load_res]) {
/* we need a data proj from the previous load for this optimization */
* We may remove the second Store, if it does not have an exception handler.
*/
if (! info->projs[pn_Store_X_except]) {
- DBG_OPT_WAR(pred, store);
+ DBG_OPT_WAR(store, pred);
exchange( info->projs[pn_Store_M], mem );
return 1;
}
projects / libfirm / blobdiff