From ed3810bf5e284b243b4500951652839235dd2113 Mon Sep 17 00:00:00 2001
From: Ariel Ben-Yehuda <ariel.byd@gmail.com>
Date: Tue, 18 Apr 2017 15:05:27 +0300
Subject: lower `move_val_init` during MIR construction

Because of its "magic" order-of-evaluation semantics, `move_val_init`
must be lowered during MIR construction in order to work.
---
 src/test/codegen/move-val-init.rs | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 src/test/codegen/move-val-init.rs

(limited to 'src/test/codegen')

diff --git a/src/test/codegen/move-val-init.rs b/src/test/codegen/move-val-init.rs
new file mode 100644
index 00000000000..98b7db60b68
--- /dev/null
+++ b/src/test/codegen/move-val-init.rs
@@ -0,0 +1,29 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags: -C no-prepopulate-passes
+
+#![feature(core_intrinsics)]
+#![crate_type = "lib"]
+
+// test that `move_val_init` actually avoids big allocas
+
+use std::intrinsics::move_val_init;
+
+pub struct Big {
+    pub data: [u8; 65536]
+}
+
+// CHECK-LABEL: @test_mvi
+#[no_mangle]
+pub unsafe fn test_mvi(target: *mut Big, make_big: fn() -> Big) {
+    // CHECK: call void %1(%Big*{{[^%]*}} %0)
+    move_val_init(target, make_big());
+}
-- 
cgit 1.4.1-3-g733a5