gnu/dist/gcc4/gcc/testsuite/gcc.dg/tree-ssa/loop-5.c

   1 /* A test for induction variable merging.  */
   2
   3 /* { dg-do compile } */
   4 /* { dg-options "-O1 -fdump-tree-vars" } */
   5
   6 void foo(long);
   7
   8 void xxx(void)
   9 {
  10   long iter, jter;
  11
  12   for (iter = 0, jter = 2; iter < 100; iter++, jter++)
  13     {
  14       foo (iter);
  15       foo (jter);
  16     }
  17 }
  18
  19 /* Only iter variable should remain.  */
  20
  21 /* { dg-final { scan-tree-dump-times "int iter" 1 "vars" } } */
  22 /* { dg-final { scan-tree-dump-times "jter" 0 "vars" } } */
  23
  24 /* And the use of jter should be replaced by iter + 2 */
  25
  26 /* { dg-final { scan-tree-dump-times " \\+ 2" 1 "vars" } } */
  27
  28 /* { dg-final { cleanup-tree-dump "vars" } } */