HHC 2018 Programming Contests

[3298]

Further improvement: DUP DATE DUP ROT ROT DDAYS can be DATE DUP2 DDAYS instead. Also applies to the 50g version where the new UNROT was used in place of ROT ROT.
Later in the program there's DUP ROT ROT which can be SWAP OVER. In SysRPL there's a command that is named both DUPUNROT and SWAPOVER because these operations are equivalent, but since UNROT is not a thing in the 48 version of UserRPL, the latter translates to a shorter UserRPL command sequence. On the 50g it's irrelevant of course.

(10-05-2018 09:51 PM)Gerson W. Barbosa Wrote:  HEAD takes one additional nibble when compared to “1 GET”, but I didn’t know the former was more efficient as I haven’t timed both options.

Wait, HEAD is a romptr? HP, why!?
I didn't actually check the length because I just assumed that such a basic command would be part of the command set which are merely simple pointers. Now I did, and you're right. HEAD is indeed a romptr, which makes it bigger than the more flexible (as in: can be changed to use other indices) 1 GET. At least on my 50g it's still slightly faster, so there's that (even though romptrs take a few milliseconds to resolve; I guess GET spends that time converting the real number to a system binary integer).