dbaumgarten
commented
3 years ago Adding this for single lines to the yolol-optimizer should be pretty easy. But making this work accross multiple lines (and therefore also in nolol) is much, much harder. Figuring out where to put the assignment for the local variable is absolutely non-trivial, because the location you choose might prevent future optimizations or do something the user is not expecting.
For example: Just adding the assignment to the start of the programm would be simple. But that might make the first lines just a little to long to be merged into a single line, which in turn might slow down an important part of the program.
Tl;Dr: Doing this for a single line is easy. But trying to do this accross multiple lines might actually make it worse in some circumstances.
I'll think a little about this, maybe if I can come up with something. If you have an idea how to reliably place that assignment accross multiple lines, please let me know.
(If there is no reasonable way to do this for multple lines, I'll proably just implement the single-line version. It's still better than nothing)
Woccz
For lines of NOLOL/YOLOL where a constant is mentioned multiple times, it could be assigned to a local variable to save characters.
For example, the line
a = 1526293.832 * (:y - 1526293.832)could be optimised towhich saves on characters after compilation to YOLOL.
The optimiser would have to check if this indeed saves characters, as a 1 character constant, or few character constant with only two or so mentions on a line, may increase the length of a line if assigned to a local variable.
Of course, this behaviour can be emulated by the programmer, however, I believe it would be a helpful automatic optimisation.
This might be especially helpful for optimising NOLOL macros, as a single macro representing a long constant, repeated multiple times on a line, can easily lead to a lot of character wastage.
Global Common Subexpression Elimination: Sometimes it may be beneficial to set constants that are only mentioned once, if there happens to be extra space available on another line, to save space on an over-length line.
Example:
Thank you. Wock