1 files changed, 31 insertions, 0 deletions
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/memcmp_ms.c b/ArmPkg/Library/CompilerIntrinsicsLib/memcmp_ms.c
new file mode 100644
index 0000000000..551f8e77c1
--- /dev/null
+++ b/ArmPkg/Library/CompilerIntrinsicsLib/memcmp_ms.c
@@ -0,0 +1,31 @@
+//------------------------------------------------------------------------------
+//
+// Copyright (c) 2019, Pete Batard. All rights reserved.
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+//------------------------------------------------------------------------------
+
+#if defined(_M_ARM64)
+typedef unsigned __int64  size_t;
+#else
+typedef unsigned __int32  size_t;
+#endif
+
+int memcmp(void *, void *, size_t);
+#pragma intrinsic(memcmp)
+#pragma function(memcmp)
+int memcmp(const void *s1, const void *s2, size_t n)
+{
+  unsigned char const *t1 = s1;
+  unsigned char const *t2 = s2;
+
+  while (n--) {
+    if (*t1 != *t2)
+      return (int)*t1 - (int)*t2;
+    t1++;
+    t2++;
+  }
+
+  return 0;
+}