gcc/testsuite/gcc.dg/20070112-1.c

   1 /* We used to ICE on this testcase: the address of bad_spill_regs is
   2    only taken in a phi node, which we missed and cleared its TREE_ADDRESSABLE
   3    flag.  This gets revealed when the loop is completely unrolled, thus
   4    exposing the addresses as ordinary statements.  */
   5
   6 /* { dg-do compile } */
   7 /* { dg-options "-O1" } */
   8
   9
  10 typedef unsigned HARD_REG_SET[2];
  11 static HARD_REG_SET bad_spill_regs;
  12
  13 void
  14 order_regs_for_reload ()
  15 {
  16   register int i;
  17
  18   register unsigned *scan_tp_ = bad_spill_regs;
  19
  20   for (i = 0; i < 2; i++)
  21     *scan_tp_++ = 0;
  22
  23   bad_spill_regs[0] |= 1;
  24 }