gcc/testsuite/gcc.target/i386/pr51987.c

   1 /* PR tree-optimization/51987 */
   2 /* { dg-do run { target { ! { ia32 } } } } */
   3 /* { dg-options "-O3" } */
   4
   5 extern void abort (void);
   6 union U { unsigned long long l; struct { unsigned int l, h; } i; };
   7
   8 __attribute__((noinline, noclone)) void
   9 foo (char *x, char *y)
  10 {
  11   int i;
  12   for (i = 0; i < 64; i++)
  13     {
  14       union U u;
  15       asm ("movl %1, %k0; salq $32, %0" : "=r" (u.l) : "r" (i));
  16       x[i] = u.i.h;
  17       union U v;
  18       asm ("movl %1, %k0; salq $32, %0" : "=r" (v.l) : "r" (i));
  19       y[i] = v.i.h;
  20     }
  21 }
  22
  23 int
  24 main ()
  25 {
  26   char a[64], b[64];
  27   int i;
  28   foo (a, b);
  29   for (i = 0; i < 64; i++)
  30     if (a[i] != i || b[i] != i)
  31       abort ();
  32   return 0;
  33 }