gcc/testsuite/gcc.dg/tree-ssa/ltrans-1.c


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/* { dg-do compile } */ 
/* { dg-options "-O2 -ftree-loop-linear -fdump-tree-ltrans-all" } */
/* { dg-options "-O2 -ftree-loop-linear -fdump-tree-ltrans-all -march=i486" { target { i?86-*-* && ilp32} } } */
/* { dg-require-effective-target size32plus } */

double u[1782225];
int foo(int N, int *res)
{
  int i, j;
  double sum = 0.0;
  /* This loop should be converted to a perfect nest and
     interchanged. */
  for (i = 0; i < N; i++)
    {
      for (j = 0; j < N; j++)
	sum = sum + u[i + 1335 * j];
      
      u[1336 * i] *= 2;
    }
  *res = sum + N;
}
/* { dg-final { scan-tree-dump-times "converted loop nest to perfect loop nest" 1 "ltrans"} } */ 
/* { dg-final { scan-tree-dump-times "transformed loop" 1 "ltrans"} } */ 
/* { dg-final { cleanup-tree-dump "ltrans" } } */