1 files changed, 7 insertions, 0 deletions
diff --git a/tools/clang-tidy/test/performance-type-promotion-in-math-fn.cpp b/tools/clang-tidy/test/performance-type-promotion-in-math-fn.cpp
new file mode 100644
index 0000000000..9a6fcf9848
--- /dev/null
+++ b/tools/clang-tidy/test/performance-type-promotion-in-math-fn.cpp
@@ -0,0 +1,7 @@
+double acos(double);
+
+void check_all_fns()
+{
+  float a;
+  acos(a);
+}