FLS
#ifndef FLS
ATF_CHECK_EQ((TYPE)0, FLS(0));
ATF_CHECK_EQ_MSG(i + 1, FLS(x),
"%s(%#jx) == %d != %d", __STRING(FLS), (intmax_t)x, FLS(x), i + 1);
ATF_CHECK_EQ_MSG(n, FLS(x),
"%s(%#jx) == %d != %d", __STRING(FLS), (intmax_t)x, FLS(x), n);
PMCDBG1(LOG,FLS,1, "po=%p", po);
DBG_SET_FLAG_MIN("flush", FLS);