diff options
Diffstat (limited to 'gcc/tree-data-ref.c')
| -rw-r--r-- | gcc/tree-data-ref.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/gcc/tree-data-ref.c b/gcc/tree-data-ref.c index 3a204d51621..7e9c99fc53a 100644 --- a/gcc/tree-data-ref.c +++ b/gcc/tree-data-ref.c @@ -741,7 +741,7 @@ dr_analyze_indices (struct data_reference *dr, struct loop *nest) { op = TREE_OPERAND (aref, 1); access_fn = analyze_scalar_evolution (loop, op); - access_fn = resolve_mixers (nest, access_fn); + access_fn = instantiate_scev (nest, loop, access_fn); VEC_safe_push (tree, heap, access_fns, access_fn); TREE_OPERAND (aref, 1) = build_int_cst (TREE_TYPE (op), 0); @@ -793,8 +793,6 @@ dr_analyze_alias (struct data_reference *dr) } DR_SYMBOL_TAG (dr) = smt; - if (smt && var_can_have_subvars (smt)) - DR_SUBVARS (dr) = get_subvars_for_var (smt); vops = BITMAP_ALLOC (NULL); FOR_EACH_SSA_TREE_OPERAND (op, stmt, it, SSA_OP_VIRTUAL_USES) @@ -1267,6 +1265,8 @@ dr_may_alias_p (const struct data_reference *a, const struct data_reference *b) return true; } +static void compute_self_dependence (struct data_dependence_relation *); + /* Initialize a data dependence relation between data accesses A and B. NB_LOOPS is the number of loops surrounding the references: the size of the classic distance/direction vectors. */ @@ -1301,6 +1301,20 @@ initialize_data_dependence_relation (struct data_reference *a, return res; } + /* When the references are exactly the same, don't spend time doing + the data dependence tests, just initialize the ddr and return. */ + if (operand_equal_p (DR_REF (a), DR_REF (b), 0)) + { + DDR_AFFINE_P (res) = true; + DDR_ARE_DEPENDENT (res) = NULL_TREE; + DDR_SUBSCRIPTS (res) = VEC_alloc (subscript_p, heap, DR_NUM_DIMENSIONS (a)); + DDR_LOOP_NEST (res) = loop_nest; + DDR_INNER_LOOP (res) = 0; + DDR_SELF_REFERENCE (res) = true; + compute_self_dependence (res); + return res; + } + /* If the references do not access the same object, we do not know whether they alias or not. */ if (!operand_equal_p (DR_BASE_OBJECT (a), DR_BASE_OBJECT (b), 0)) @@ -1326,6 +1340,7 @@ initialize_data_dependence_relation (struct data_reference *a, DDR_SUBSCRIPTS (res) = VEC_alloc (subscript_p, heap, DR_NUM_DIMENSIONS (a)); DDR_LOOP_NEST (res) = loop_nest; DDR_INNER_LOOP (res) = 0; + DDR_SELF_REFERENCE (res) = false; for (i = 0; i < DR_NUM_DIMENSIONS (a); i++) { @@ -3800,7 +3815,8 @@ compute_affine_dependence (struct data_dependence_relation *ddr, } /* Analyze only when the dependence relation is not yet known. */ - if (DDR_ARE_DEPENDENT (ddr) == NULL_TREE) + if (DDR_ARE_DEPENDENT (ddr) == NULL_TREE + && !DDR_SELF_REFERENCE (ddr)) { dependence_stats.num_dependence_tests++; |