gcc/testsuite/gcc.target/i386/parity-6.c

/* { dg-do compile } */
/* { dg-options "-O2 -march=core-avx2" } */
/* { dg-final { scan-assembler "popcnt" } } */
/* { dg-final { scan-assembler "and" } } */

int foo(unsigned long long x)
{
  return __builtin_parityll(x);
}