From 1cc349edc9ca4861fd7ff0c3d6877dd40c528716 Mon Sep 17 00:00:00 2001
From: lxq <877250099@qq.com>
Date: Wed, 8 Mar 2023 10:33:42 +0800
Subject: [PATCH] fix a tiny bug

---
 src/codegen/regalloc.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/codegen/regalloc.cpp b/src/codegen/regalloc.cpp
index c4bc373..80e5f44 100644
--- a/src/codegen/regalloc.cpp
+++ b/src/codegen/regalloc.cpp
@@ -36,6 +36,8 @@ RegAllocator::no_reg_alloca(Value *v) {
         else if (instr->is_zext()) { // only alloca for true use
             bool alloc;
             ASSERT_CMPINST_USED_ONCE(instr);
+            if (instr->get_use_list().size() == 0)
+                return false;
             auto use_ins = dynamic_cast<Instruction *>(
                 instr->get_use_list().begin()->val_);
             // assert(use_ins != nullptr && "should only be instruction?");
-- 
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