[PATCH] Testcase for PR66974

[Richard Biener]

Committed.

2017-12-14  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/66974
        * gcc.dg/Warray-bounds-24.c: New testcase.

Index: gcc/testsuite/gcc.dg/Warray-bounds-24.c
===================================================================
--- gcc/testsuite/gcc.dg/Warray-bounds-24.c     (nonexistent)
+++ gcc/testsuite/gcc.dg/Warray-bounds-24.c     (working copy)
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -Warray-bounds" } */
+
+int foo(unsigned order)
+{
+  int c[3] = {1, 2, 3};
+  unsigned i, j;
+  for (i = 1; i < order; i++) {
+      for (j = 0; j < i / 2; j++) {
+         c[j] += c[i] * c[i-j-1]; /* { dg-bogus "array bounds" } */
+         c[i-j-1] += c[i] * c[j]; /* { dg-bogus "array bounds" } */
+      }
+  }
+  return c[0];
+}