H64
ATF_REQUIRE(H64(0x123456789abcdef0ull) == 0x123456789abcdef0ull);
ATF_REQUIRE(H64(0x123456789abcdef0ull) == 0x123456789abcdef0ull);
ATF_REQUIRE(H64(0x123456789abcdef0ull) == 0x123456789abcdef0ull);
ATF_REQUIRE(H64(0x123456789abcdef0ull) == 0x123456789abcdef0ull);