--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Walloca-10.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,26 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target alloca } */
+/* { dg-options "-Walloca-larger-than=2000 -O2" } */
+
+// Test when the conditionals are incorrectly reversed.
+
+void f (void *);
+void foo (__SIZE_TYPE__ len)
+{
+  void *p;
+  if (len < 500)
+    p = __builtin_malloc (len);
+  else
+    p = __builtin_alloca (len); // { dg-warning "argument to .alloca. may be too large" }
+  f (p);
+}
+
+void bar (__SIZE_TYPE__ len)
+{
+  void *p;
+  if (len > 500)
+    p = __builtin_alloca (len); // { dg-warning "argument to .alloca. may be too large" }
+  else
+    p = __builtin_malloc (len);
+  f (p);
+}