gcc/testsuite/gcc.dg/tree-ssa/slsr-40.c

   1 /* Verify straight-line strength reduction for array
   2    subscripting.
   3
   4    elems[n-1] is reduced to elems + n * 4 + 0xffffffff * 4, only when
   5    pointers are of the same size as that of int (assuming 4 bytes).  */
   6
   7 /* { dg-do run } */
   8 /* { dg-options "-O2" } */
   9
  10 struct data
  11 {
  12   unsigned long elms[1];
  13 } gData;
  14
  15 void __attribute__((noinline))
  16 foo (struct data *dst, unsigned int n)
  17 {
  18   dst->elms[n - 1] &= 1;
  19 }
  20
  21 int
  22 main ()
  23 {
  24   foo (&gData, 1);
  25   return 0;
  26 }
  27