/* A test for strength reduction and induction variable elimination. */ /* { dg-do compile } */ /* { dg-options "-O1 -fdump-tree-vars" } */ /* Size of this structure should be sufficiently weird so that no memory addressing mode applies. */ struct bla { char x[187]; int y; char z[253]; } arr_base[100]; int foo(void); void xxx(void) { int iter; for (iter = 0; iter < 100; iter++) arr_base[iter].y = foo (); } /* Access to arr_base[iter].y should be strength reduced. Depending on whether we have an addressing mode of type [base + offset], one of the following forms might get chosen: -- induction variable with base &arr_base[0].y, the memory access of form *iv = ... -- induction variable with base 0, the memory access of form *(iv + &arr_base[0].y) = ... In any case, we should not have 'arr_base.[^0].* =' */ /* { dg-final { scan-tree-dump-times "arr_base.\[^0\]\[^\\n\\r\]*=" 0 "vars" } } */ /* And the original induction variable should be eliminated. */ /* { dg-final { scan-tree-dump-times "iter" 0 "vars" } } */