gcc/testsuite/gcc.dg/store_merging_18.c

   1 /* PR tree-optimization/83843 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2 -fdump-tree-store-merging" } */
   4 /* { dg-final { scan-tree-dump-times "Merging successful" 3 "store-merging" { target { store_merge && { ! arm*-*-* } } } } } */
   5
   6 __attribute__((noipa)) void
   7 foo (unsigned char *buf, unsigned char *tab)
   8 {
   9   unsigned v = tab[1] ^ (tab[0] << 8);
  10   buf[0] = ~(v >> 8);
  11   buf[1] = ~v;
  12 }
  13
  14 __attribute__((noipa)) void
  15 bar (unsigned char *buf, unsigned char *tab)
  16 {
  17   unsigned v = tab[1] ^ (tab[0] << 8);
  18   buf[0] = (v >> 8);
  19   buf[1] = ~v;
  20 }
  21
  22 __attribute__((noipa)) void
  23 baz (unsigned char *buf, unsigned char *tab)
  24 {
  25   unsigned v = tab[1] ^ (tab[0] << 8);
  26   buf[0] = ~(v >> 8);
  27   buf[1] = v;
  28 }
  29
  30 int
  31 main ()
  32 {
  33   volatile unsigned char l1 = 0;
  34   volatile unsigned char l2 = 1;
  35   unsigned char buf[2];
  36   unsigned char tab[2] = { l1 + 1, l2 * 2 };
  37   foo (buf, tab);
  38   if (buf[0] != (unsigned char) ~1 || buf[1] != (unsigned char) ~2)
  39     __builtin_abort ();
  40   buf[0] = l1 + 7;
  41   buf[1] = l2 * 8;
  42   bar (buf, tab);
  43   if (buf[0] != 1 || buf[1] != (unsigned char) ~2)
  44     __builtin_abort ();
  45   buf[0] = l1 + 9;
  46   buf[1] = l2 * 10;
  47   baz (buf, tab);
  48   if (buf[0] != (unsigned char) ~1 || buf[1] != 2)
  49     __builtin_abort ();
  50   return 0;
  51 }