how does fasm resolve rb etc r?

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idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 30 Sep 2014, 10:13

Code:

;
;good day people
;experiment with a snippet below
;

    ;db 1,2,3

x1: rb x2
    ;fasm could precount number of db (etc d?) bytes using commas
    ;assemble, uncomment next line, assemble
    ;db 1,2,3
    ;BUT should x2 be seen instant or predicted? how does fasm see/use it?
    ;can we treat db=insert?
    ;thanx
x2:

30 Sep 2014, 10:13

l_inc

Joined: 23 Oct 2009
Posts: 881

l_inc 30 Sep 2014, 12:33

idle
The initial prediction for values not seen before is zero. If such predictions are made during a pass, fasm does one more pass (starts the compilation from the beginning), but uses the values established during the previous pass as the new predictions. If values established during the next pass are unchanged compared to the previous one (meaning the predictions based on the previous pass are correct), then the compilation successfully completes. Otherwise another pass is made. If the predictions are not stabilized within a certain number of passes (100 by default), the compilation fails with the error "code cannot be generated".

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30 Sep 2014, 12:33

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