--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/compiler-rt/test/msan/memcmp_test.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,18 @@
+// RUN: %clangxx_msan -O0 -g %s -o %t
+// RUN: not %run %t 2>&1 | FileCheck %s
+// RUN: MSAN_OPTIONS=intercept_memcmp=0 %run %t
+
+#include <string.h>
+#include <stdio.h>
+int main(int argc, char **argv) {
+  char a1[4];
+  char a2[4];
+  for (int i = 0; i < argc * 3; i++)
+    a2[i] = a1[i] = i;
+  int res = memcmp(a1, a2, 4);
+  if (!res)
+    printf("equals");
+  return 0;
+  // CHECK: Uninitialized bytes in MemcmpInterceptorCommon at offset 3
+  // CHECK: MemorySanitizer: use-of-uninitialized-value
+}