[PATCH, testsuite]: Add testcase for PR tree-optimization/19910

[Uros Bizjak]

Hello!

This failure magically dissapeared on mainline. The reduced testcase
from the PR was added to testsuite, so we will know when failure
re-appears. Testcase was tested on i686-pc-linux-gnu.

2007-07-20  Uros Bizjak  <ubizjak@gmail.com>

       PR tree-optimization/19910
       * gcc.dg/pr19910.c: New test.

Uros.

Index: gcc.dg/pr19910.c
===================================================================
--- gcc.dg/pr19910.c    (revision 0)
+++ gcc.dg/pr19910.c    (revision 126799)
@@ -0,0 +1,16 @@
+/* Contributed by Volker Reichelt <reichelt@gcc.gnu.org>.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-loop-linear" } */
+
+int a[3];
+
+void foo()
+{
+  int i, j;
+
+  for (i = 1; i >= 0; --i)
+    for (j = i; j >= 0; --j)
+      a[i+j] = 0;
+}
+