Added "yosys-smt2-wire" tag support to smt2 back-end

diff --git a/backends/smt2/smt2.cc b/backends/smt2/smt2.cc
index 1e00ac7185a24d2386ffbfb5c16047a22b5ea7d8..a544aa7d8a6f8c50515c186c8abb55938fbfd8d7 100644 (file)
--- a/backends/smt2/smt2.cc
+++ b/backends/smt2/smt2.cc
@@ -496,6 +496,8 @@ struct Smt2Worker
                                        decls.push_back(stringf("; yosys-smt2-output %s %d\n", log_id(wire), wire->width));
                                if (is_register)
                                        decls.push_back(stringf("; yosys-smt2-register %s %d\n", log_id(wire), wire->width));
+                               if (wire->get_bool_attribute("\\keep"))
+                                       decls.push_back(stringf("; yosys-smt2-wire %s %d\n", log_id(wire), wire->width));
                                if (bvmode && GetSize(sig) > 1) {
                                        decls.push_back(stringf("(define-fun |%s_n %s| ((state |%s_s|)) (_ BitVec %d) %s)\n",
                                                        log_id(module), log_id(wire), log_id(module), GetSize(sig), get_bv(sig).c_str()));