+/* Remove def stmt of VAR if VAR has zero uses and recurse
+ on rhs1 operand if so. */
+
+static void
+remove_visited_stmt_chain (tree var)
+{
+ gimple stmt;
+ gimple_stmt_iterator gsi;
+
+ while (1)
+ {
+ if (TREE_CODE (var) != SSA_NAME || !has_zero_uses (var))
+ return;
+ stmt = SSA_NAME_DEF_STMT (var);
+ if (!is_gimple_assign (stmt)
+ || !gimple_visited_p (stmt))
+ return;
+ var = gimple_assign_rhs1 (stmt);
+ gsi = gsi_for_stmt (stmt);
+ gsi_remove (&gsi, true);
+ release_defs (stmt);
+ }
+}
+