public void compareLongs(Local<Integer> target, Local<Long> a, Local<Long> b) {
    addInstruction(
        new PlainInsn(
            Rops.CMPL_LONG,
            sourcePosition,
            target.spec(),
            RegisterSpecList.make(a.spec(), b.spec())));
  }
Compare longs. This stores -1 in {@code target} if {@code a < b}, 0 in {@code target} if {@code
a == b} and 1 in target if {@code a > b}.
android/android_framework/dex-maker/src/main/java/com/android/dx/Code.java