re PR rtl-optimization/20466 (Missed invalidation of known memory contents in flow2...)

	PR rtl-optimization/20466
	* gcc.c-torture/execute/pr20466-1.c: New test.

From-SVN: r97869

gcc/testsuite/ChangeLog

+2005-04-09  Hans-Peter Nilsson  <hp@axis.com>
+
+	PR rtl-optimization/20466
+	* gcc.c-torture/execute/pr20466-1.c: New test.
+
 2005-04-08  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/20905

gcc/testsuite/gcc.c-torture/execute/pr20466-1.c

+int f (int **, int *, int *, int **, int **) __attribute__ ((__noinline__));
+int
+f (int **ipp, int *i1p, int *i2p, int **i3, int **i4)
+{
+  **ipp = *i1p;
+  *ipp = i2p;
+  *i3 = *i4;
+  **ipp = 99;
+  return 3;
+}
+
+extern void exit (int);
+extern void abort (void);
+
+int main (void)
+{
+  int i = 42, i1 = 66, i2 = 1, i3 = -1, i4 = 55;
+  int *ip = &i;
+  int *i3p = &i3;
+  int *i4p = &i4;
+
+  f (&ip, &i1, &i2, &i3p, &i4p);
+  if (i != 66 || ip != &i2 || i2 != 99 || i3 != -1 || i3p != i4p || i4 != 55)
+    abort ();
+  exit (0);
+}