smt2: Make write port array stores conditional on nonzero write mask

diff --git a/backends/smt2/smt2.cc b/backends/smt2/smt2.cc
index 9bf0de03ed3a1da647d91c82b11c800f245bb995..a3628197ec64a0b027331e8a0cdd2716284793e9 100644 (file)
--- a/backends/smt2/smt2.cc
+++ b/backends/smt2/smt2.cc
@@ -1185,10 +1185,12 @@ struct Smt2Worker
                                                data = stringf("(bvor (bvand %s %s) (bvand (select (|%s#%d#%d| state) %s) (bvnot %s)))",
                                                                data.c_str(), mask.c_str(), get_id(module), arrayid, i, addr.c_str(), mask.c_str());
 
+                                               string empty_mask(mem->width, '0');
+
                                                decls.push_back(stringf("(define-fun |%s#%d#%d| ((state |%s_s|)) (Array (_ BitVec %d) (_ BitVec %d)) "
-                                                               "(store (|%s#%d#%d| state) %s %s)) ; %s\n",
+                                                               "(ite (= %s #b%s) (|%s#%d#%d| state) (store (|%s#%d#%d| state) %s %s))) ; %s\n",
                                                                get_id(module), arrayid, i+1, get_id(module), abits, mem->width,
-                                                               get_id(module), arrayid, i, addr.c_str(), data.c_str(), get_id(mem->memid)));
+                                                               mask.c_str(), empty_mask.c_str(), get_id(module), arrayid, i, get_id(module), arrayid, i, addr.c_str(), data.c_str(), get_id(mem->memid)));
                                        }
                                }