gcc/testsuite/gcc.dg/tree-ssa/slsr-26.c

   1 /* Verify straight-line strength reduction for multiply candidates
   2    with variable stride and control flow, increment = -3.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O3 -fdump-tree-optimized" } */
   6
   7 int
   8 f (int n, int x, int stride)
   9 {
  10   int a, x1, x2, x3;
  11
  12   a = x * stride;
  13
  14   if (n > 64)
  15     {
  16       x1 = x - 3;
  17       a += x1 * stride;
  18       x2 = x1 - 3;
  19       a += x2 * stride;
  20     }
  21   else
  22     {
  23       x3 = x - 3;
  24       a += x3 * stride;
  25     }
  26
  27   return a;
  28 }
  29
  30 /* { dg-final { scan-tree-dump-times " \\* stride" 1 "optimized" } } */
  31 /* { dg-final { scan-tree-dump-times " \\* 3" 1 "optimized" } } */
  32 /* { dg-final { cleanup-tree-dump "optimized" } } */