How many elements in a CASE ?

[cyrille de brébisson]

Hello,

Case will involve a lot of tests (all the tests needs to be tested one at a time)... and this can be quite slow for byte 255....

A better approach would be to check bit 7, 6, 5... in row. Note that you can use var(index) access on integers to extract a single bit!
This would 1: change your case(256) to a series of if/then/else and lead to a consistent 8 tests per instruction.

Or, you could have your evaluation code for instruction n be called Ins_n and then do an expr("Ins_"+n+"(parameters if needed)");
This would replace your 256 long case by a single line and would be much faster than the case. I am not sure if it would be faster than the 8 tests solution.

You can also use a list (l) that contains the code for each of the instructions and do eval(l(instruction)).

Cyrille