gcc/testsuite/gcc.dg/store_merging_15.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target store_merge } */
   3 /* { dg-options "-O2 -fdump-tree-store-merging" } */
   4
   5 struct S { unsigned char a, b; unsigned short c; unsigned char d, e, f, g; unsigned long long h; };
   6
   7 __attribute__((noipa)) void
   8 f1 (struct S *__restrict p, struct S *__restrict q)
   9 {
  10   p->a = ~q->a;
  11   p->b = q->b;
  12   p->c = ~q->c;
  13   p->d = ~q->d;
  14   p->e = q->e;
  15   p->f = ~q->f;
  16   p->g = ~q->g;
  17 }
  18
  19 __attribute__((noipa)) void
  20 f2 (struct S *__restrict p, struct S *__restrict q)
  21 {
  22   p->a = ~(unsigned char) (p->a & q->a);
  23   p->b = ((unsigned char) ~p->b) & q->b;
  24   p->c = p->c & (unsigned short) ~q->c;
  25   p->d = p->d & q->d;
  26   p->e = p->e & (unsigned char) ~q->e;
  27   p->f = p->f & (unsigned char) ~q->f;
  28   p->g = ~(unsigned char) (p->g & q->g);
  29 }
  30
  31 struct S s = { 20, 21, 22, 23, 24, 25, 26, 27 };
  32 struct S u = { 28, 29, 30, 31, 32, 33, 34, 35 };
  33 struct S v = { 36, 37, 38, 39, 40, 41, 42, 43 };
  34
  35 int
  36 main ()
  37 {
  38   asm volatile ("" : : : "memory");
  39   f1 (&s, &u);
  40   asm volatile ("" : : : "memory");
  41   if (s.a != (unsigned char) ~28 || s.b != 29
  42       || s.c != (unsigned short) ~30 || s.d != (unsigned char) ~31
  43       || s.e != 32 || s.f != (unsigned char) ~33 || s.g != (unsigned char) ~34
  44       || s.h != 27)
  45     __builtin_abort ();
  46   f2 (&u, &v);
  47   asm volatile ("" : : : "memory");
  48   if (u.a != (unsigned char) ~(28 & 36) || u.b != (((unsigned char) ~29) & 37)
  49       || u.c != (30 & (unsigned short) ~38) || u.d != (31 & 39)
  50       || u.e != (32 & (unsigned char) ~40) || u.f != (33 & (unsigned char) ~41)
  51       || u.g != (unsigned char) ~(34 & 42) || u.h != 35)
  52     __builtin_abort ();
  53   return 0;
  54 }
  55
  56 /* { dg-final { scan-tree-dump-times "Merging successful" 2 "store-merging" } } */