CHECK(ptrmod(&z64, 64) == 0, " address is %p, want 64 byte alignment", &z64);
CHECK(ptrmod(&z4096, 4096) == 0, " address is %p, want 4096 byte alignment", &z4096);
CHECK(ptrmod(&z64, 64) == 0, " address is %p, want 64 byte alignment", &z64);
CHECK(ptrmod(&z4096, 4096) == 0, " address is %p, want 4096 byte alignment", &z4096);