2 files changed, 55 insertions, 0 deletions
diff --git a/tests/codegen/array-codegen.rs b/tests/codegen/array-codegen.rs
index ba0d444f97e..bf5ae74679b 100644
--- a/tests/codegen/array-codegen.rs
+++ b/tests/codegen/array-codegen.rs
@@ -32,3 +32,25 @@ pub fn array_copy(a: &[u8; 4], p: &mut [u8; 4]) {
     // CHECK: store <4 x i8> %[[TEMP2]], ptr %p, align 1
     *p = *a;
 }
+
+// CHECK-LABEL: @array_copy_1_element
+#[no_mangle]
+pub fn array_copy_1_element(a: &[u8; 1], p: &mut [u8; 1]) {
+    // CHECK: %[[LOCAL:.+]] = alloca [1 x i8], align 1
+    // CHECK: %[[TEMP1:.+]] = load i8, ptr %a, align 1
+    // CHECK: store i8 %[[TEMP1]], ptr %[[LOCAL]], align 1
+    // CHECK: %[[TEMP2:.+]] = load i8, ptr %[[LOCAL]], align 1
+    // CHECK: store i8 %[[TEMP2]], ptr %p, align 1
+    *p = *a;
+}
+
+// CHECK-LABEL: @array_copy_2_elements
+#[no_mangle]
+pub fn array_copy_2_elements(a: &[u8; 2], p: &mut [u8; 2]) {
+    // CHECK: %[[LOCAL:.+]] = alloca [2 x i8], align 1
+    // CHECK: %[[TEMP1:.+]] = load <2 x i8>, ptr %a, align 1
+    // CHECK: store <2 x i8> %[[TEMP1]], ptr %[[LOCAL]], align 1
+    // CHECK: %[[TEMP2:.+]] = load <2 x i8>, ptr %[[LOCAL]], align 1
+    // CHECK: store <2 x i8> %[[TEMP2]], ptr %p, align 1
+    *p = *a;
+}
diff --git a/tests/codegen/array-optimized.rs b/tests/codegen/array-optimized.rs
new file mode 100644
index 00000000000..27448fdcfad
--- /dev/null
+++ b/tests/codegen/array-optimized.rs
@@ -0,0 +1,33 @@
+// compile-flags: -O
+
+#![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 <2 x i8>, ptr %a, align 1
+    // CHECK: store <2 x i8> %[[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 <4 x i8>, ptr %a, align 1
+    // CHECK: store <4 x i8> %[[TEMP]], ptr %p, align 1
+    // CHECK: ret
+    *p = *a;
+}