return vn_nary_op_insert_into (vno1, valid_info->nary);
}
+/* Return whether we can track a predicate valid when PRED_E is executed. */
+
+static bool
+can_track_predicate_on_edge (edge pred_e)
+{
+ /* ??? As we are currently recording a basic-block index in
+ vn_pval.valid_dominated_by_p and using dominance for the
+ validity check we cannot track predicates on all edges. */
+ if (single_pred_p (pred_e->dest))
+ return true;
+ /* Never record for backedges. */
+ if (pred_e->flags & EDGE_DFS_BACK)
+ return false;
+ /* When there's more than one predecessor we cannot track
+ predicate validity based on the destination block. The
+ exception is when all other incoming edges are backedges. */
+ edge_iterator ei;
+ edge e;
+ int cnt = 0;
+ FOR_EACH_EDGE (e, ei, pred_e->dest->preds)
+ if (! dominated_by_p (CDI_DOMINATORS, e->src, e->dest))
+ cnt++;
+ return cnt == 1;
+}
+
static vn_nary_op_t
vn_nary_op_insert_pieces_predicated (unsigned int length, enum tree_code code,
tree type, tree *ops,
tree result, unsigned int value_id,
edge pred_e)
{
- /* ??? Currently tracking BBs. */
- if (! single_pred_p (pred_e->dest))
- {
- /* Never record for backedges. */
- if (pred_e->flags & EDGE_DFS_BACK)
- return NULL;
- edge_iterator ei;
- edge e;
- int cnt = 0;
- /* Ignore backedges. */
- FOR_EACH_EDGE (e, ei, pred_e->dest->preds)
- if (! dominated_by_p (CDI_DOMINATORS, e->src, e->dest))
- cnt++;
- if (cnt != 1)
- return NULL;
- }
+ if (!can_track_predicate_on_edge (pred_e))
+ return NULL;
if (dump_file && (dump_flags & TDF_DETAILS)
/* ??? Fix dumping, but currently we only get comparisons. */
&& TREE_CODE_CLASS (code) == tcc_comparison)