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OK this can be preaty lame question but. I have got structure with qwords ...... zzzz

just look at this:

mov .iloscMat,eax
mov .SumaN,qword ptr 0 <--- it's not working of course but i need something like this

thanks Comrade.

i shouldnt work that late :sweat:

And more efficiently,

fldz

fstp qword ptr [edx].SumaN

More efficient because the FPU doesn't have to go through the process of converting from a float to an integer. In this case, it would still be the same 0 getting into memory.

Raymond

On Northwood, the two dword moves take one tickless than the FPU and MMX ones.

I tested like so:

mov     ebx,OFFSET shit



        mov     ecx,[rounds]

.next:  rdtsc

        mov     esi,eax

        mov     edi,edx



        ;mov     dword [ebx+00h],0

        ;mov     dword [ebx+04h],0



        ;fldz

        ;fstp    qword [ebx]



        pxor    MM0,MM0

        movq    [ebx],MM0



        rdtsc

        add     esi,54h

        sub     eax,esi

        sbb     edx,edi

        add     dword [sum+00h],eax

        add     dword [sum+04h],edx

        loop    .next



        mov     edx,dword [sum+04h]

        mov     eax,dword [sum+00h]

        div     [rounds]



        showhex "ticks",eax



        sum             dq      0

        rounds          dd      1000h

        shit            dq      0