diff --git a/test_regress/t/t_balance_cats.py b/test_regress/t/t_opt_balance_cats.py
similarity index 100%
rename from test_regress/t/t_balance_cats.py
rename to test_regress/t/t_opt_balance_cats.py
diff --git a/test_regress/t/t_balance_cats.v b/test_regress/t/t_opt_balance_cats.v
similarity index 100%
rename from test_regress/t/t_balance_cats.v
rename to test_regress/t/t_opt_balance_cats.v
diff --git a/test_regress/t/t_balance_cats_nofunc.py b/test_regress/t/t_opt_balance_cats_nofunc.py
similarity index 78%
rename from test_regress/t/t_balance_cats_nofunc.py
rename to test_regress/t/t_opt_balance_cats_nofunc.py
index 6ce07d2c6..153050312 100755
--- a/test_regress/t/t_balance_cats_nofunc.py
+++ b/test_regress/t/t_opt_balance_cats_nofunc.py
@@ -11,9 +11,11 @@ import vltest_bootstrap
 
 test.scenarios('vlt')
 
-test.top_filename = "t/t_balance_cats.v"
+test.top_filename = "t/t_opt_balance_cats.v"
 
-test.compile(verilator_flags2=["--stats", "-fno-func-opt"])
+test.compile(verilator_flags2=[
+    "--stats", "-fno-func-opt", "-fno-func-opt-balance-cat", "-fno-func-opt-split-cat"
+])
 
 test.file_grep_not(test.stats, r'Optimizations, FuncOpt concat trees balances')
 test.file_grep_not(test.stats, r'Optimizations, FuncOpt concat splits')
diff --git a/test_regress/t/t_balance_cats_sc.py b/test_regress/t/t_opt_balance_cats_sc.py
similarity index 94%
rename from test_regress/t/t_balance_cats_sc.py
rename to test_regress/t/t_opt_balance_cats_sc.py
index 4bf066c4e..d9b6693a3 100755
--- a/test_regress/t/t_balance_cats_sc.py
+++ b/test_regress/t/t_opt_balance_cats_sc.py
@@ -11,7 +11,7 @@ import vltest_bootstrap
 
 test.scenarios('vlt')
 
-test.top_filename = "t/t_balance_cats.v"
+test.top_filename = "t/t_opt_balance_cats.v"
 
 test.compile(verilator_flags2=[
     "--stats", "--build", "--gate-stmts", "10000", "--expand-limit", "128", "--sc"
diff --git a/test_regress/t/t_var_life.py b/test_regress/t/t_opt_life.py
similarity index 89%
rename from test_regress/t/t_var_life.py
rename to test_regress/t/t_opt_life.py
index 235481a3b..76637c7ee 100755
--- a/test_regress/t/t_var_life.py
+++ b/test_regress/t/t_opt_life.py
@@ -17,6 +17,7 @@ if test.vlt_all:
     test.file_grep(test.stats, r'Optimizations, Lifetime assign deletions\s+(\d+)', 4)
     test.file_grep(test.stats, r'Optimizations, Lifetime creset deletions\s+(\d+)', 1)
     test.file_grep(test.stats, r'Optimizations, Lifetime constant prop\s+(\d+)', 5)
+    test.file_grep(test.stats, r'Optimizations, Lifetime postassign deletions\s+(\d+)', 1)
 
 test.execute()
 
diff --git a/test_regress/t/t_var_life.v b/test_regress/t/t_opt_life.v
similarity index 100%
rename from test_regress/t/t_var_life.v
rename to test_regress/t/t_opt_life.v