From a31d14e8e659f893bbbc8201fa59f53a810b0e29 Mon Sep 17 00:00:00 2001
From: Bryan Murdock <bmurdock@gmail.com>
Date: Fri, 3 Apr 2026 09:10:14 -0600
Subject: [PATCH] fix slice method, reuse other slice test stuff for [1:0] case

---
 include/verilated_types.h      | 8 +++++++-
 test_regress/t/t_queue_slice.v | 8 +++-----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/include/verilated_types.h b/include/verilated_types.h
index 8a3360016..da82102fe 100644
--- a/include/verilated_types.h
+++ b/include/verilated_types.h
@@ -650,8 +650,14 @@ public:
     // Return slice q[lsb:msb]
     VlQueue slice(int32_t lsb, int32_t msb) const {
         VlQueue out;
+        if (VL_UNLIKELY(lsb > msb)) return out;
+        if (VL_UNLIKELY(lsb == msb)) {
+            if (lsb > 0 && lsb < m_deque.size()) {
+                out.push_back(m_deque[lsb]);
+            }
+            return out;
+        }
         if (VL_UNLIKELY(lsb < 0)) lsb = 0;
-        if (VL_UNLIKELY(lsb >= m_deque.size())) lsb = m_deque.size() - 1;
         if (VL_UNLIKELY(msb >= m_deque.size())) msb = m_deque.size() - 1;
         for (int32_t i = lsb; i <= msb; ++i) out.push_back(m_deque[i]);
         return out;
diff --git a/test_regress/t/t_queue_slice.v b/test_regress/t/t_queue_slice.v
index 6c8b7e5fe..32a7ae9dc 100644
--- a/test_regress/t/t_queue_slice.v
+++ b/test_regress/t/t_queue_slice.v
@@ -68,6 +68,9 @@ module t;
     `checkp(q, "'{\"d\", \"e\", \"f\"}");
     q = q[$:$];
     `checkp(q, "'{\"f\"}");
+    q = q[1:$];
+    `checkp("'{}");
+
 
     // Similar using implied notation
     q = '{"f"};
@@ -84,11 +87,6 @@ module t;
     q = {q, q};
     `checkp(q, "'{\"a\", \"b\", \"a\", \"b\"}");
 
-    q = {"a"};
-    q = q[1:$];
-    i = q.size();
-    `checkh(i, 0);
-
     begin
       static string ai[$] = '{"Foo", "Bar"};
       q = ai;  // Copy