gcc/testsuite/gcc.dg/tree-ssa/loop-15.c

   1 /* A test for # of iterations analysis (signed counter cannot wrap) and final
   2    value replacement.  */
   3
   4 /* { dg-options "-O2 -fdump-tree-optimized" } */
   5
   6 int foo(void);
   7
   8 int bla(void)
   9 {
  10   int i, n = foo (), j;
  11
  12   j = 0;
  13   /* The loop should be removed completely.  */
  14   for (i = 1; i <= n; i++)
  15     j += n;
  16
  17   /* Should be replaced with return n * n;  */
  18   return j;
  19 }
  20
  21 /* Since the loop is removed, there should be no addition.  */
  22 /* { dg-final { scan-tree-dump-times "\\+" 0 "optimized" } } */
  23 /* { dg-final { scan-tree-dump-times "n \\* n" 1 "optimized" } } */
  24
  25 /* The if from the loop header copying remains in the code.  */
  26 /* { dg-final { scan-tree-dump-times "if " 1 "optimized" } } */
  27 /* { dg-final { cleanup-tree-dump "optimized" } } */