gcc/testsuite/gcc.dg/pr84877.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2" } */
   3
   4 #include <inttypes.h>
   5
   6 struct U {
   7     int M0;
   8     int M1;
   9 } __attribute ((aligned (16)));
  10
  11 volatile struct U p0 = {1, 0};
  12
  13 void __attribute__ ((noinline))
  14 foo (struct U p)
  15 {
  16
  17   volatile intptr_t mask = 0b1111;
  18   volatile int dummy[2];
  19   struct U p1 = p;
  20   dummy[1] = p.M0;
  21
  22   if ((intptr_t)(&p1) & mask)
  23     __builtin_abort ();
  24   if ((intptr_t)(&p) & mask)
  25     __builtin_abort ();
  26
  27   if (p1.M0 != dummy[1])
  28     __builtin_abort ();
  29   if (p1.M1 != p.M1)
  30     __builtin_abort ();
  31 }
  32
  33 int
  34 main ()
  35 {
  36   foo (p0);
  37   return 0;
  38 }