A simple question , why doesn't this work:
mov ebx,m[edx*4]
mov eax,conv[edx*4]
mul ebx
I checked m[edx*4] it has 2 (what should be there) same for conv[edx*4].
It's basically just a 2*3.
m and conv are dd 2500 dup(?) <---- Thats why It doesn't work ?
I try to follow: Check what the 32 bit value is at memory location m and conv What is the value of edx when you start mov ebx,m[edx*4] Check if the expected values in ebx and eax are correct Edx will be overridden because MUL and IMUL instructions stores the result in EDX and EAX https://en.wikipedia.org/wiki/X86_instruction_listings
MUL is used for unsigned multiplications, IMUL for signed multiplications. This means that, in contrary what Jester says: for 32 bits operands you use MUL (unsigned), for 31 bits with sign in 32th bit you use IMUL.
If this all is ok, you should have in edx = 0 and eax = 6 if m[edx*4] = 2 and conv[edx*4] = 3 (or vice versa) mind that conv and m are 32 bits, with the least significant byte in the lowest memory location.
correct me if I'm wrong.