1 files changed, 60 insertions, 0 deletions
diff --git a/library/compiler-builtins/builtins-test/tests/aeabi_memclr.rs b/library/compiler-builtins/builtins-test/tests/aeabi_memclr.rs
new file mode 100644
index 00000000000..bfd15a391aa
--- /dev/null
+++ b/library/compiler-builtins/builtins-test/tests/aeabi_memclr.rs
@@ -0,0 +1,60 @@
+#![cfg(all(
+    target_arch = "arm",
+    not(any(target_env = "gnu", target_env = "musl")),
+    target_os = "linux",
+    feature = "mem"
+))]
+#![feature(compiler_builtins_lib)]
+#![no_std]
+
+extern crate compiler_builtins;
+
+// test runner
+extern crate utest_cortex_m_qemu;
+
+// overrides `panic!`
+#[macro_use]
+extern crate utest_macros;
+
+use core::mem;
+
+macro_rules! panic {
+    ($($tt:tt)*) => {
+        upanic!($($tt)*);
+    };
+}
+
+extern "C" {
+    fn __aeabi_memclr4(dest: *mut u8, n: usize);
+    fn __aeabi_memset4(dest: *mut u8, n: usize, c: u32);
+}
+
+struct Aligned {
+    array: [u8; 8],
+    _alignment: [u32; 0],
+}
+
+impl Aligned {
+    fn new() -> Self {
+        Aligned {
+            array: [0; 8],
+            _alignment: [],
+        }
+    }
+}
+
+#[test]
+fn memclr4() {
+    let mut aligned = Aligned::new();
+    assert_eq!(mem::align_of_val(&aligned), 4);
+    let xs = &mut aligned.array;
+
+    for n in 0..9 {
+        unsafe {
+            __aeabi_memset4(xs.as_mut_ptr(), n, 0xff);
+            __aeabi_memclr4(xs.as_mut_ptr(), n);
+        }
+
+        assert!(xs[0..n].iter().all(|x| *x == 0));
+    }
+}