gcc/testsuite/gcc.dg/tree-ssa/pr26435.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -ftree-loop-linear -fdump-tree-ltrans-all" } */
   3 /* { dg-require-effective-target size32plus } */
   4
   5 int foo(int *p, int n)
   6 {
   7   int i, j, k = 0;
   8
   9   /* This is a reduction: there is a scalar dependence that cannot be
  10      removed by rewriting IVs.  This code cannot and should not be
  11      transformed into a perfect loop.  */
  12   for (i = 0; i < 2; ++i, p += n)
  13     for (j = 0; j < 2; ++j)
  14       k += p[j];
  15
  16   return k;
  17 }
  18
  19 /* { dg-final { scan-tree-dump-times "converted loop nest to perfect loop nest" 0 "ltrans"} } */
  20 /* { dg-final { cleanup-tree-dump "ltrans" } } */