gcc/testsuite/gcc.dg/tree-ssa/slsr-34.c

   1 /* Verify straight-line strength reduction for a candidate with a basis
   2    hidden by two phi dependences, and having a known stride.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O3 -fdump-tree-optimized" } */
   6
   7 extern void
   8 g (void);
   9
  10 int
  11 f (int c, int i)
  12 {
  13   int a1, a2, a3, x1, x2, x3, x;
  14
  15   a1 = i * 16;
  16   x1 = c + a1;
  17
  18   i = i + 2;
  19   a2 = i * 16;
  20   x2 = c + a2;
  21
  22   if (x2 > 6)
  23     {
  24       if (c < 200)
  25         i = i + 2;
  26       else
  27         i = i + 4;
  28       g ();
  29     }
  30   else
  31     i = i + 6;
  32
  33   i = i + 2;
  34   a3 = i * 16;
  35   x3 = c + a3;
  36
  37   x = x1 + x2 + x3;
  38   return x;
  39 }
  40
  41 /* { dg-final { scan-tree-dump-times " \\* " 1 "optimized" } } */
  42 /* { dg-final { scan-tree-dump-times "PHI" 2 "optimized" } } */