1 files changed, 64 insertions, 0 deletions
diff --git a/tests/codegen/slice-init.rs b/tests/codegen/slice-init.rs
new file mode 100644
index 00000000000..794b773a776
--- /dev/null
+++ b/tests/codegen/slice-init.rs
@@ -0,0 +1,64 @@
+// compile-flags: -C no-prepopulate-passes
+
+#![crate_type = "lib"]
+
+// CHECK-LABEL: @zero_sized_elem
+#[no_mangle]
+pub fn zero_sized_elem() {
+    // CHECK-NOT: br label %repeat_loop_header{{.*}}
+    // CHECK-NOT: call void @llvm.memset.p0
+    let x = [(); 4];
+    drop(&x);
+}
+
+// CHECK-LABEL: @zero_len_array
+#[no_mangle]
+pub fn zero_len_array() {
+    // CHECK-NOT: br label %repeat_loop_header{{.*}}
+    // CHECK-NOT: call void @llvm.memset.p0
+    let x = [4; 0];
+    drop(&x);
+}
+
+// CHECK-LABEL: @byte_array
+#[no_mangle]
+pub fn byte_array() {
+    // CHECK: call void @llvm.memset.{{.+}}({{i8\*|ptr}} {{.*}}, i8 7, i{{[0-9]+}} 4
+    // CHECK-NOT: br label %repeat_loop_header{{.*}}
+    let x = [7u8; 4];
+    drop(&x);
+}
+
+#[allow(dead_code)]
+#[derive(Copy, Clone)]
+enum Init {
+    Loop,
+    Memset,
+}
+
+// CHECK-LABEL: @byte_enum_array
+#[no_mangle]
+pub fn byte_enum_array() {
+    // CHECK: call void @llvm.memset.{{.+}}({{i8\*|ptr}} {{.*}}, i8 {{.*}}, i{{[0-9]+}} 4
+    // CHECK-NOT: br label %repeat_loop_header{{.*}}
+    let x = [Init::Memset; 4];
+    drop(&x);
+}
+
+// CHECK-LABEL: @zeroed_integer_array
+#[no_mangle]
+pub fn zeroed_integer_array() {
+    // CHECK: call void @llvm.memset.{{.+}}({{i8\*|ptr}} {{.*}}, i8 0, i{{[0-9]+}} 16
+    // CHECK-NOT: br label %repeat_loop_header{{.*}}
+    let x = [0u32; 4];
+    drop(&x);
+}
+
+// CHECK-LABEL: @nonzero_integer_array
+#[no_mangle]
+pub fn nonzero_integer_array() {
+    // CHECK: br label %repeat_loop_header{{.*}}
+    // CHECK-NOT: call void @llvm.memset.p0
+    let x = [0x1a_2b_3c_4d_u32; 4];
+    drop(&x);
+}