gcc/testsuite/gcc.dg/tree-ssa/slsr-37.c

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