From fc1aa55540145e46037aa1c72208690d1ae902ee Mon Sep 17 00:00:00 2001
From: ShouyangDong <dongshouyang@gmail.com>
Date: Mon, 5 Jan 2026 13:43:06 +0000
Subject: [PATCH] fix error in horizontal fusion

---
 src/tir/transforms/horizontal_fusion.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/tir/transforms/horizontal_fusion.cc b/src/tir/transforms/horizontal_fusion.cc
index a96dcae469ca..fee0e50fab0c 100644
--- a/src/tir/transforms/horizontal_fusion.cc
+++ b/src/tir/transforms/horizontal_fusion.cc
@@ -73,6 +73,7 @@ class HorizontalFuser : public StmtExprMutator {
     thread_tag_var_map_.Set("threadIdx.x", Var("thread_idx_x"));
     thread_tag_var_map_.Set("threadIdx.y", Var("thread_idx_y"));
     thread_tag_var_map_.Set("threadIdx.z", Var("thread_idx_z"));
+    thread_tag_var_map_.Set("vthread.x", Var("vthread_x"));
   }
 
   PrimExpr VisitExpr_(const VarNode* op) final {