collapseos/blk/023
Virgil Dupras ed2b91411a Limit ourselves to 8-bit branching
I'm planning on going back to 8-bit branching. 16-bit br cells incur
a non-negligible penalty and, while at first 64 words (128 bytes
forward or backward) seemed a bit limiting, I now don't see why one
would ever construct such a big branch. It would be un-forthy.

Also, I looked at using BC instead of IY to hold IP and the transition
would be a lot easier with 8-bit branching.

In this commit, all I do is add overflow checks in IF. The mechanic
below doesn't change. I'll give myself some time to think it over so
that I avoid yet another back and forth.
2020-05-24 10:16:25 -04:00

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Branching
Branching in Collapse OS is limited to 8-bit. This represents
64 word references forward or backward. While this might seem
a bit tight at first, having this limit saves us a non-
negligible amount of resource usage.
The reasoning behind this intentional limit is that huge
branches are generally a indicator that a logic ought to be
simplified. So here's one more constraint for you to help you
towards simplicity.