Merge ref 'efd420c770bb' from rust-lang/rust

Pull recent changes from https://github.com/rust-lang/rust via Josh.

Upstream ref: efd420c770bb179537c01063e98cb6990c439654
Filtered ref: d11dbbb02905535a89393e80c24274bee81fa928

This merge was created using https://github.com/rust-lang/josh-sync.

1 files changed, 33 insertions, 0 deletions

diff --git a/tests/codegen-llvm/array-optimized.rs b/tests/codegen-llvm/array-optimized.rs
new file mode 100644
index 00000000000..000163d5519
--- /dev/null
+++ b/tests/codegen-llvm/array-optimized.rs
@@ -0,0 +1,33 @@
+//@ compile-flags: -Copt-level=3
+
+#![crate_type = "lib"]
+
+// CHECK-LABEL: @array_copy_1_element
+#[no_mangle]
+pub fn array_copy_1_element(a: &[u8; 1], p: &mut [u8; 1]) {
+    // CHECK-NOT: alloca
+    // CHECK: %[[TEMP:.+]] = load i8, ptr %a, align 1
+    // CHECK: store i8 %[[TEMP]], ptr %p, align 1
+    // CHECK: ret
+    *p = *a;
+}
+
+// CHECK-LABEL: @array_copy_2_elements
+#[no_mangle]
+pub fn array_copy_2_elements(a: &[u8; 2], p: &mut [u8; 2]) {
+    // CHECK-NOT: alloca
+    // CHECK: %[[TEMP:.+]] = load i16, ptr %a, align 1
+    // CHECK: store i16 %[[TEMP]], ptr %p, align 1
+    // CHECK: ret
+    *p = *a;
+}
+
+// CHECK-LABEL: @array_copy_4_elements
+#[no_mangle]
+pub fn array_copy_4_elements(a: &[u8; 4], p: &mut [u8; 4]) {
+    // CHECK-NOT: alloca
+    // CHECK: %[[TEMP:.+]] = load i32, ptr %a, align 1
+    // CHECK: store i32 %[[TEMP]], ptr %p, align 1
+    // CHECK: ret
+    *p = *a;
+}