From 7ed3f79c87f2cda1fde37b3fc6b6e272360e3b3d Mon Sep 17 00:00:00 2001
From: Vern Paxson <vern@corelight.com>
Date: Fri, 6 Dec 2024 16:16:35 -0800
Subject: [PATCH] modified merge_types() to skip work if given identical types,
 which also preserves type names (useful for -O gen-C++)

---
 src/Type.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Type.cc b/src/Type.cc
index 4b6d78a066..e32a4565bb 100644
--- a/src/Type.cc
+++ b/src/Type.cc
@@ -2376,6 +2376,9 @@ TypeListPtr merge_list_types(const Type* t1, const Type* t2) {
 }
 
 TypePtr merge_types(const TypePtr& arg_t1, const TypePtr& arg_t2) {
+    if ( arg_t1 == arg_t2 )
+        return arg_t1;
+
     auto t1 = arg_t1.get();
     auto t2 = arg_t2.get();
     // t1 = flatten_type(t1);