From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/test/ui/codegen/init-large-type.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 src/test/ui/codegen/init-large-type.rs

(limited to 'src/test/ui/codegen/init-large-type.rs')

diff --git a/src/test/ui/codegen/init-large-type.rs b/src/test/ui/codegen/init-large-type.rs
new file mode 100644
index 000000000..ce905572f
--- /dev/null
+++ b/src/test/ui/codegen/init-large-type.rs
@@ -0,0 +1,23 @@
+// compile-flags: -O
+// run-pass
+
+#![allow(unused_must_use)]
+// Makes sure that zero-initializing large types is reasonably fast,
+// Doing it incorrectly causes massive slowdown in LLVM during
+// optimisation.
+
+// pretty-expanded FIXME #23616
+// ignore-emscripten no threads support
+
+#![feature(intrinsics)]
+
+use std::{mem, thread};
+
+const SIZE: usize = 1024 * 1024;
+
+fn main() {
+    // do the test in a new thread to avoid (spurious?) stack overflows
+    thread::spawn(|| {
+        let _memory: [u8; SIZE] = unsafe { mem::zeroed() };
+    }).join();
+}
-- 
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