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Index > Macroinstructions > Distinguish between 8, 16, and 32 bit registers

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rCX



Joined: 29 Jul 2007
Posts: 169
Location: Maryland, USA
rCX
Is there a way to distinguish between registers of different sizes? For example the following code

Code:
macro type A
{
    if A eqtype al
        display "8-bit",13,10
    end if

    if A eqtype ax
        display "16-bit",13,10
    end if
}

type ax    


Results in

Code:
8-bit
16-bit    
Post 13 Jul 2021, 01:48
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bitRAKE



Joined: 21 Jul 2003
Posts: 3282
Location: vpcmipstrm
bitRAKE
Code:
macro type A {
    if A eqtype al
        virtual
            mov A,0
            i = 0
            while 1
                load C byte from $ - i - 1
                if C <> 0
                    break
                end if
                i = i + 1
            end while
        end virtual

        if i = 1
            display "8-bit",13,10
        else if i = 2
            display "16-bit",13,10
        else if i = 4
            display "32-bit",13,10
        end if
    end if
}    

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Post 13 Jul 2021, 04:37
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 18171
Location: In your JS exploiting you and your system
revolution
Perhaps it is more typing, but it is also more explicit, so I think I would be more inclined to use in.
Code:
use64
if A in <al,bl,cl,dl,sil,dil,r8b,...>
  display '8-bit',13,10
else if A in <ax,bx,cx,...>
  ...
end if    
Post 13 Jul 2021, 07:59
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bitRAKE



Joined: 21 Jul 2003
Posts: 3282
Location: vpcmipstrm
bitRAKE
In the 64-bit case it is more correct to use in.
(fasmg no have in, but there are other tricks.)

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Post 13 Jul 2021, 12:08
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