/* Data references and dependences detectors.
- Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
+ Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Free Software Foundation, Inc.
Contributed by Sebastian Pop <pop@cri.ensmp.fr>
#include "tree-pass.h"
#include "langhooks.h"
#include "tree-affine.h"
+#include "params.h"
static struct datadep_stats
{
/* Compute in DEPENDENCE_RELATIONS the data dependence graph for all
the data references in DATAREFS, in the LOOP_NEST. When
COMPUTE_SELF_AND_RR is FALSE, don't compute read-read and self
- relations. */
+ relations. Return true when successful, i.e. data references number
+ is small enough to be handled. */
-void
+bool
compute_all_dependences (VEC (data_reference_p, heap) *datarefs,
VEC (ddr_p, heap) **dependence_relations,
VEC (loop_p, heap) *loop_nest,
struct data_reference *a, *b;
unsigned int i, j;
+ if ((int) VEC_length (data_reference_p, datarefs)
+ > PARAM_VALUE (PARAM_LOOP_MAX_DATAREFS_FOR_DATADEPS))
+ {
+ struct data_dependence_relation *ddr;
+
+ /* Insert a single relation into dependence_relations:
+ chrec_dont_know. */
+ ddr = initialize_data_dependence_relation (NULL, NULL, loop_nest);
+ VEC_safe_push (ddr_p, heap, *dependence_relations, ddr);
+ return false;
+ }
+
FOR_EACH_VEC_ELT (data_reference_p, datarefs, i, a)
for (j = i + 1; VEC_iterate (data_reference_p, datarefs, j, b); j++)
if (DR_IS_WRITE (a) || DR_IS_WRITE (b) || compute_self_and_rr)
if (loop_nest)
compute_affine_dependence (ddr, VEC_index (loop_p, loop_nest, 0));
}
+
+ return true;
}
/* Stores the locations of memory references in STMT to REFERENCES. Returns
if ((stmt_code == GIMPLE_CALL
&& !(gimple_call_flags (stmt) & (ECF_CONST | ECF_PURE)))
|| (stmt_code == GIMPLE_ASM
- && gimple_asm_volatile_p (stmt)))
+ && (gimple_asm_volatile_p (stmt) || gimple_vuse (stmt))))
clobbers_memory = true;
if (!gimple_vuse (stmt))
TODO: This function should be made smarter so that it can handle address
arithmetic as if they were array accesses, etc. */
-tree
+static tree
find_data_references_in_loop (struct loop *loop,
VEC (data_reference_p, heap) **datarefs)
{
dependences. */
if (!loop
|| !find_loop_nest (loop, loop_nest)
- || find_data_references_in_loop (loop, datarefs) == chrec_dont_know)
- {
- struct data_dependence_relation *ddr;
-
- /* Insert a single relation into dependence_relations:
- chrec_dont_know. */
- ddr = initialize_data_dependence_relation (NULL, NULL, *loop_nest);
- VEC_safe_push (ddr_p, heap, *dependence_relations, ddr);
- res = false;
- }
- else
- compute_all_dependences (*datarefs, dependence_relations, *loop_nest,
- compute_self_and_read_read_dependences);
+ || find_data_references_in_loop (loop, datarefs) == chrec_dont_know
+ || !compute_all_dependences (*datarefs, dependence_relations, *loop_nest,
+ compute_self_and_read_read_dependences))
+ res = false;
if (dump_file && (dump_flags & TDF_STATS))
{
if (find_data_references_in_bb (NULL, bb, datarefs) == chrec_dont_know)
return false;
- compute_all_dependences (*datarefs, dependence_relations, NULL,
- compute_self_and_read_read_dependences);
- return true;
+ return compute_all_dependences (*datarefs, dependence_relations, NULL,
+ compute_self_and_read_read_dependences);
}
/* Entry point (for testing only). Analyze all the data references
VEC (data_reference_p, heap) **datarefs)
{
struct graph *rdg = NULL;
- VEC (gimple, heap) *stmts = VEC_alloc (gimple, heap, 10);
-
- compute_data_dependences_for_loop (loop, false, loop_nest, datarefs,
- dependence_relations);
- if (known_dependences_p (*dependence_relations))
+ if (compute_data_dependences_for_loop (loop, false, loop_nest, datarefs,
+ dependence_relations)
+ && known_dependences_p (*dependence_relations))
{
+ VEC (gimple, heap) *stmts = VEC_alloc (gimple, heap, 10);
stmts_from_loop (loop, &stmts);
rdg = build_empty_rdg (VEC_length (gimple, stmts));
create_rdg_vertices (rdg, stmts);
create_rdg_edges (rdg, *dependence_relations);
+ VEC_free (gimple, heap, stmts);
}
- VEC_free (gimple, heap, stmts);
return rdg;
}