gcc/testsuite/gcc.dg/tree-ssa/slsr-18.c

   1 /* Straight-line strength reduction control flow variation with incr = -1.  */
   2
   3 /* { dg-do compile } */
   4 /* { dg-options "-O3 -fdump-tree-optimized" } */
   5
   6 int
   7 f (int n, int c, int s)
   8 {
   9   int a1, a2, a3, a4, x1, x2, x3, x4;
  10
  11   a1 = 4 * s;
  12   x1 = c + a1;
  13   x2 = x3 = x4 = c;
  14
  15   if (n > 64)
  16     {
  17       a2 = 3 * s;
  18       x2 = c + a2;
  19       a3 = 2 * s;
  20       x3 = c + a3;
  21     }
  22   else
  23     {
  24       a4 = 3 * s;
  25       x4 = c + a4;
  26     }
  27
  28   return x1 + x2 + x3 + x4;
  29 }
  30
  31 /* { dg-final { scan-tree-dump-times " \\* " 1 "optimized" } } */