re PR middle-end/55481 (-O2 generates a wrong-code infinite loop in…

re PR middle-end/55481 (-O2 generates a wrong-code infinite loop in C++Benchmark's simple_types_constant_folding int8 xor test)

2013-03-01  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/55481
	* gcc.dg/torture/pr56488.c: New testcase.

From-SVN: r196377

gcc/testsuite/ChangeLog

+2013-03-01  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/55481
+	* gcc.dg/torture/pr56488.c: New testcase.
+
 2013-02-28  Konstantin Serebryany  <konstantin.s.serebryany@gmail.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/testsuite/gcc.dg/torture/pr56488.c

+/* { dg-do run } */
+
+int a, c, d = 1;
+struct S { int s; } b, f;
+short e;
+
+static void
+foo (int x)
+{
+  int g[] = { };
+  for (e = 0; e != 1; e = e + 5)
+    {
+      int *h[1] = { &g[0] };
+      if (!x)
+	return;
+      f = b;
+    }
+}
+
+int
+main ()
+{
+  int i, j;
+  for (i = 0; i < 6; i++)
+    for (j = 8; j; j--)
+      a = 0;
+  foo (d);
+  while (c)
+    ;
+  return 0;
+}