1 files changed, 22 insertions, 0 deletions
diff --git a/test/msan/select_origin.cc b/test/msan/select_origin.cc
new file mode 100644
index 000000000000..e832c02e99ce
--- /dev/null
+++ b/test/msan/select_origin.cc
@@ -0,0 +1,22 @@
+// RUN: %clangxx_msan -fsanitize-memory-track-origins -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_msan -fsanitize-memory-track-origins -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_msan -fsanitize-memory-track-origins -O2 %s -o %t && not %run %t 2>&1 | FileCheck %s
+
+// Test condition origin propagation through "select" IR instruction.
+
+#include <stdio.h>
+#include <stdint.h>
+
+__attribute__((noinline))
+int *max_by_ptr(int *a, int *b) {
+  return *a < *b ? b : a;
+}
+
+int main(void) {
+  int x;
+  int *volatile px = &x;
+  int y = 43;
+  int *p = max_by_ptr(px, &y);
+  // CHECK: Uninitialized value was created by an allocation of 'x' in the stack frame of function 'main'
+  return *p;
+}