1 files changed, 47 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/tree-ssa/pr18178.C b/gcc/testsuite/g++.dg/tree-ssa/pr18178.C
new file mode 100644
index 000000000..9223e8323
--- /dev/null
+++ b/gcc/testsuite/g++.dg/tree-ssa/pr18178.C
@@ -0,0 +1,47 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-vrp1" } */
+
+// Define this to see it work.
+// #define WORK_WORK_WORK
+
+#define THIRD
+
+#ifdef THIRD
+#define FIRST  i < 0 || 
+#define ORIG int
+#define CAST
+#else
+
+#define FIRST
+#ifdef WORK_WORK_WORK
+#define ORIG unsigned int
+#define CAST
+#else
+#define ORIG int
+#define CAST (unsigned)
+#endif // WORK_WORK_WORK
+
+#endif // THIRD
+
+struct array
+{
+  const ORIG len;
+  int *data;
+};
+
+extern void call (ORIG);
+
+void doit (array *a)
+{
+  for (ORIG i = 0; i < a->len; ++i)
+    {
+      if (FIRST  CAST (i) >= CAST (a->len))
+	throw 5;
+      call (a->data[i]);
+    }
+}
+
+/* VRP should remove all but 1 if() in the loop.  */
+
+/* { dg-final { scan-tree-dump-times "if " 1 "vrp1"} } */
+/* { dg-final { cleanup-tree-dump "vrp1" } } */