gcc/testsuite/gcc.dg/pr89354.c

/* PR rtl-optimization/89354 */
/* { dg-do run } */
/* { dg-options "-O2" } */
/* { dg-additional-options "-msse2" { target sse2_runtime } } */

static unsigned long long q = 0;

__attribute__((noipa)) static void
foo (void)
{
  q = (q & ~0x1ffffffffULL) | 0x100000000ULL;
}

int
main ()
{
  __asm volatile ("" : "+m" (q));
  foo ();
  if (q != 0x100000000ULL)
    __builtin_abort ();
  return 0;
}