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ManOfSteel



Joined: 02 Feb 2005
Posts: 1154
ManOfSteel
Hello,

I'm trying to convert a piece of code from MASM to FASM.

Could you tell me what "ASSUME esi:PTR PARTICAL" does exactly ("PARTICAL" is a structure)?

Also, REAL4 in "math_da REAL4 6.135923151E-3" is a float, right? Can floats be used with FASM?

Thanks in advance.
Post 20 Apr 2007, 17:33
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Vasilev Vjacheslav



Joined: 11 Aug 2004
Posts: 392
Vasilev Vjacheslav
masm: math_da REAL4 6.135923151E-3
fasm: math_da dd 6.135923151E-3

i think you must show us your code after "ASSUME esi:PTR PARTICAL"
Post 21 Apr 2007, 09:12
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ManOfSteel



Joined: 02 Feb 2005
Posts: 1154
ManOfSteel
Here it is:
Code:
    mov esi, pMem
    ASSUME esi:PTR PARTICAL

    fld math_da
    fldpi
    mov ecx, NUM_OBJECTS

    .REPEAT

...

        mov [esi].x, eax
        mov [esi].y, edx

        fstp [esi].vx
        fstp [esi].vy

        fsub st, st(1)      ;// a   da

        add esi, SIZEOF PARTICAL
        dec ecx

    .UNTIL ZERO?
...
    


What will be the content of esi at every step?
Post 22 Apr 2007, 10:27
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farrier



Joined: 26 Aug 2004
Posts: 274
Location: North Central Mississippi
farrier
ManOfSteel,

Try:
Code:
       mov     esi, [pMem]
         virtual at esi
                      my_PARTICAL     PARTICAL
            end virtual
 mov     [my_PARTICAL.x], eax
        mov     [my_PARTICAL.y], edx
        fstp    [my_PARTICAL.vx]
    fstp    [my_PARTICAL.vy]
    


hth,

farrier

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Post 22 Apr 2007, 13:54
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Vasilev Vjacheslav



Joined: 11 Aug 2004
Posts: 392
Vasilev Vjacheslav
my version:

Code:
   mov     esi,[pMem]
  fld     [math_da]
   fldpi
       mov     ecx,NUM_OBJECTS

  .lp:
        mov        [esi+PARTICAL.x],eax
        mov     [esi+PARTICAL.y],edx
        fstp    [esi+PARTICAL.vx]
        fstp       [esi+PARTICAL.vy]
        fsub       st,st(1)
        add         esi,sizeof.PARTICAL
        dec      ecx
        jnz      .lp
    
Post 22 Apr 2007, 17:02
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ManOfSteel



Joined: 02 Feb 2005
Posts: 1154
ManOfSteel
Thank you very much, both versions are perfect!
Post 23 Apr 2007, 06:11
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HexEdit



Joined: 31 Jul 2006
Posts: 6
Location: Russia
HexEdit
I think, that the "virtual" version is better.
Post 28 Apr 2007, 14:54
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Vasilev Vjacheslav



Joined: 11 Aug 2004
Posts: 392
Vasilev Vjacheslav
i thinks they're same
Post 28 Apr 2007, 15:57
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ManOfSteel



Joined: 02 Feb 2005
Posts: 1154
ManOfSteel
Indeed, they give the same output. The virtual method results in a smaller and clearer source code, though.
Post 29 Apr 2007, 05:39
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