long mulMod(long a, long b, long m) {
        long aHi = a >>> 32; // < 2^31
        long bHi = b >>> 32; // < 2^31
        long aLo = a & 0xFFFFFFFFL; // < 2^32
        long bLo = b & 0xFFFFFFFFL; // < 2^32

        /*
         * a * b == aHi * bHi * 2^64 + (aHi * bLo + aLo * bHi) * 2^32 + aLo * bLo.
         *       == (aHi * bHi * 2^32 + aHi * bLo + aLo * bHi) * 2^32 + aLo * bLo
         *

  private static final HashFunction SIP_WITHOUT_KEY = Hashing.sipHash24();

  // These constants were originally ported from https://www.131002.net/siphash/siphash24.c. See:
  // https://github.com/nahi/siphash-java-inline/blob/master/src/test/java/org/jruby/util/SipHashInlineTest.java
  private static final long[] EXPECTED =
      new long[] {
        0x726fdb47dd0e0e31L,
        0x74f839c593dc67fdL,

          "im??imijuf?nah?oy??r&ihsayim?otagan??t&asim!ak??igus?omatik??zak??u&bihcihc!ihsagih??sonuok?ynah????y&ak&aw!.&a&d&ira?notimak??kadih?ma&h&arihs?im??y&a&kaw?tik??oduk???ru&ustakihcan?y??sauy?wa&g&a&dira?zok??orih??konik??yok?zok??e&banat?dawi??i&garustak?jiat?mani??naniak?o&bog?nimik?t&asim?omihs&ah?uk????ugnihs???o!.&a&jos?koasak?m&ay&ako?ust??ihsayah??r&abi?ukawaihsin??wi&aka?nam???e&gakay?kaw??i&gan?h&cu&kasa?otes??sahakat??k&asim?ihsaruk??miin??n&anemuk?ezib??o&hsotas?jnihs?n&amat?...

  private static final HashFunction SIP_WITHOUT_KEY = Hashing.sipHash24();

  // These constants were originally ported from https://www.131002.net/siphash/siphash24.c. See:
  // https://github.com/nahi/siphash-java-inline/blob/master/src/test/java/org/jruby/util/SipHashInlineTest.java
  private static final long[] EXPECTED =
      new long[] {
        0x726fdb47dd0e0e31L,
        0x74f839c593dc67fdL,