From 2bda6713c7a225e73b266ea50748e04188efed38 Mon Sep 17 00:00:00 2001
From: is57primenumber <58158444+is57primenumber@users.noreply.github.com>
Date: Tue, 9 Dec 2025 22:34:04 +0900
Subject: [PATCH] Add regression test for closure loop vectorization

---
 tests/assembly-llvm/slp-vectorize-closure.rs | 28 ++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 tests/assembly-llvm/slp-vectorize-closure.rs

diff --git a/tests/assembly-llvm/slp-vectorize-closure.rs b/tests/assembly-llvm/slp-vectorize-closure.rs
new file mode 100644
index 0000000000000..fcdb469a24139
--- /dev/null
+++ b/tests/assembly-llvm/slp-vectorize-closure.rs
@@ -0,0 +1,28 @@
+//! Loop inside closure correctly compiled to assembly using SSE instructions.
+//! Regression test for <https://github.com/rust-lang/rust/issues/120189>.
+//! also see <https://godbolt.org/z/W1Yc4s3xo>
+//@ assembly-output: emit-asm
+//@ compile-flags: -Copt-level=3
+//@ only-x86_64
+// to test SSE instructions
+
+#![crate_type = "lib"]
+
+// CHECK-LABEL: for_in_closure
+// CHECK: {{paddb|psubb}}
+#[inline(never)]
+#[no_mangle]
+pub fn for_in_closure() {
+    let mut v = [[0u8; 4]; 60];
+
+    let mut closure = || {
+        for item in &mut v {
+            item[0] += 1;
+            item[1] += 1;
+            item[2] += 1;
+            item[3] += 1;
+        }
+    };
+
+    closure();
+}