/* Regression test for PR/77822.  */

/* { dg-do compile } */
/* { dg-options "-O3 -march=zEC12" } */

class A {
  void m_fn1();
  char m_datawidth;
  char m_subunits;
  int m_subunit_infos[];
};
int a;
long b;
void A::m_fn1() {
  int c = 32, d = m_datawidth / c;
  for (int e = 0; e < d; e++) {
    int f = e * 32;
    if (b >> f & 1)
      m_subunit_infos[m_subunits] = a;
  }
}