1 files changed, 51 insertions, 0 deletions
diff --git a/MdePkg/Library/CompilerIntrinsicsLib/memmove_ms.c b/MdePkg/Library/CompilerIntrinsicsLib/memmove_ms.c
new file mode 100644
index 0000000000..f68eb52a6c
--- /dev/null
+++ b/MdePkg/Library/CompilerIntrinsicsLib/memmove_ms.c
@@ -0,0 +1,51 @@
+// ------------------------------------------------------------------------------
+//
+// Copyright (c) 2019, Pete Batard. All rights reserved.
+// Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// ------------------------------------------------------------------------------
+
+#if defined (_M_ARM64)
+typedef unsigned __int64 size_t;
+#else
+typedef unsigned __int32 size_t;
+#endif
+
+void *
+memmove (
+  void *,
+  const void *,
+  size_t
+  );
+
+#pragma intrinsic(memmove)
+#pragma function(memmove)
+void *
+memmove (
+  void        *dest,
+  const void  *src,
+  size_t      n
+  )
+{
+  unsigned char        *d;
+  unsigned char const  *s;
+
+  d = dest;
+  s = src;
+
+  if (d < s) {
+    while (n-- != 0) {
+      *d++ = *s++;
+    }
+  } else {
+    d += n;
+    s += n;
+    while (n-- != 0) {
+      *--d = *--s;
+    }
+  }
+
+  return dest;
+}