1 files changed, 16 insertions, 0 deletions
diff --git a/lib/msan/lit_tests/unaligned_read_origin.cc b/lib/msan/lit_tests/unaligned_read_origin.cc
new file mode 100644
index 000000000000..fa29ab69de1b
--- /dev/null
+++ b/lib/msan/lit_tests/unaligned_read_origin.cc
@@ -0,0 +1,16 @@
+// RUN: %clangxx_msan -fsanitize-memory-track-origins -m64 -O0 %s -o %t && not %t >%t.out 2>&1
+// RUN: FileCheck %s < %t.out && FileCheck %s < %t.out
+// RUN: %clangxx_msan -fsanitize-memory-track-origins -m64 -O3 %s -o %t && not %t >%t.out 2>&1
+// RUN: FileCheck %s < %t.out && FileCheck %s < %t.out
+
+#include <sanitizer/msan_interface.h>
+
+int main(int argc, char **argv) {
+  int x;
+  int *volatile p = &x;
+  return __sanitizer_unaligned_load32(p);
+  // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
+  // CHECK: {{#0 0x.* in main .*unaligned_read_origin.cc:}}[[@LINE-2]]
+  // CHECK: Uninitialized value was created by an allocation of 'x' in the stack frame of function 'main'
+  // CHECK: {{#0 0x.* in main .*unaligned_read_origin.cc:}}[[@LINE-7]]
+}