re PR tree-optimization/20216 (Simple loop runs out of stack at -O1)

	PR 20216
	* gcc.dg/pr20216.c: New.

From-SVN: r126014

gcc/testsuite/ChangeLog

+2007-06-25  Geoffrey Keating  <geoffk@apple.com>
+
+	PR 20216
+	* gcc.dg/pr20216.c: New.
+
 2007-06-25  Andrew Pinski  <andrew_pinski@playstation.sony.com>
 
 	PR tree-opt/32421

gcc/testsuite/gcc.dg/pr20216.c

+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+static unsigned int *buffer;
+
+void FUNC (void)
+{
+ unsigned int *base;
+ int i, j;
+
+ for (i = 0; i < 4; i++)
+  for (j = 0; j < 1600000; j++)
+   *base++ = buffer[j];
+}