Anonymous labels in repeat statements

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nmaps

Joined: 26 Oct 2012
Posts: 8

nmaps 03 Sep 2013, 05:25

Anonymous labels do not appear to work in repeat statements (using the latest version of fasm).

Sample:

Code:

repeat 3
        sub ecx, 1
        jl @f
        lodsb
    @@: 
        shl eax, 8
end repeat

[/code]

03 Sep 2013, 05:25

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8357
Location: Kraków, Poland

Tomasz Grysztar 09 Sep 2013, 20:56

During the assembly stage in fasm labels correspond to fixed points in source, so this repeated block tries to re-define the same label three times. To get the result you expect you should use the REPT directive and allow preprocessor to generate a separate piece of source (and thus a separate label) for each repetition:

Code:

rept 3 {
        sub ecx, 1 
        jl @f 
        lodsb 
    @@:  
        shl eax, 8
}

09 Sep 2013, 20:56

l_inc

Joined: 23 Oct 2009
Posts: 881

l_inc 09 Sep 2013, 21:30

Tomasz Grysztar
Using the rare occasion of your presence I'd like to report, that the archive with the latest fasm version for Windows is incomplete.

_________________
Faith is a superposition of knowledge and fallacy

09 Sep 2013, 21:30

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