gcc/testsuite/gcc.dg/tree-ssa/slsr-32.c

   1 /* Verify straight-line strength reduction for a candidate with a basis
   2    hidden by a phi dependence and having an unknown stride.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O3 -fdump-tree-optimized" } */
   6
   7 int
   8 f (int s, int c, int i)
   9 {
  10   int a1, a2, a3, x1, x2, x3, x;
  11
  12   a1 = i * s;
  13   x1 = c + a1;
  14
  15   i = i + 2;
  16   a2 = i * s;
  17   x2 = c + a2;
  18
  19   if (x2 > 6)
  20     i = i + 2;
  21
  22   i = i + 2;
  23   a3 = i * s;
  24   x3 = c + a3;
  25
  26   x = x1 + x2 + x3;
  27   return x;
  28 }
  29
  30 /* { dg-final { scan-tree-dump-times " \\* s" 1 "optimized" } } */
  31 /* { dg-final { scan-tree-dump-times " \\* 2" 1 "optimized" } } */