Distinguish between 8, 16, and 32 bit registers

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rCX

Joined: 29 Jul 2007
Posts: 172
Location: Maryland, USA

rCX 13 Jul 2021, 01:48

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

13 Jul 2021, 01:48

bitRAKE

Joined: 21 Jul 2003
Posts: 4073
Location: vpcmpistri

bitRAKE 13 Jul 2021, 04:37

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
}

_________________
¯\(°_o)/¯ “languages are not safe - uses can be” Bjarne Stroustrup

13 Jul 2021, 04:37

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20448
Location: In your JS exploiting you and your system

revolution 13 Jul 2021, 07:59

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

13 Jul 2021, 07:59

bitRAKE

Joined: 21 Jul 2003
Posts: 4073
Location: vpcmpistri

bitRAKE 13 Jul 2021, 12:08

In the 64-bit case it is more correct to use in.
(fasmg no have in, but there are other tricks.)

_________________
¯\(°_o)/¯ “languages are not safe - uses can be” Bjarne Stroustrup

13 Jul 2021, 12:08

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