re PR tree-optimization/56407 (Optimizations (-O2 -O3) make comparison of arrays of ints to fail)

2013-04-03  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/56407
	* gcc.dg/torture/pr56407.c: New testcase.

From-SVN: r197399

gcc/testsuite/ChangeLog

+2013-04-03  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/56407
+	* gcc.dg/torture/pr56407.c: New testcase.
+
 2013-04-03  Marc Glisse  <marc.glisse@inria.fr>
 
 	PR tree-optimization/56790

gcc/testsuite/gcc.dg/torture/pr56407.c

+/* { dg-do run } */
+
+extern void abort(void);
+extern int rand(void);
+
+static void copy(int *r,int *a,int na)
+{
+  int i;
+  for( i = 0 ; i < na ; i++ )
+    r[i] = a[i];
+}
+
+static void foo(int *a,int na)
+{
+  int i;
+  for( i = 0 ; i < na ; i++ )
+    a[i] = rand();
+}
+
+static int cmp(int *a,int *b,int n)
+{
+  int i;
+  for( i = 0 ; i < n ; i++ )
+    if ( a[i] != b[i] )
+      return -1;
+  return 0;
+}
+
+void __attribute__((noinline,noclone))
+test(int sz,int comm)
+{
+  int j,n;
+  int v[64],w[64];
+  for( j = 1 ; j <= sz ; j++ )
+    {
+      n = (2 * j - 1) * (2 * j - 1);
+      foo(w,n);
+      copy(v,w,n);
+      if ( comm )
+	if ( cmp(v,w,n) ) abort ();
+    }
+}
+
+int main()
+{
+  test(2,1);
+  return 0;
+}