assembly help

[Sirrius]

What does this syntax mean and how may I convert it to NASM?

leal (%eax,%eax),%edx
movw (%eax,edx),%ax

...Anybody? Thanks. B.

[ZoogieZork]

(Note: I may be a little rusty): The full syntax for memory references in AT&T syntax is: displacement(base,index,scale) The above syntax translates to (in Intel syntax): [base+(index*scale)+disp] Most parts are optional; e.g. scale defaults to 1, displacement defaults to 0. The l, w, and b suffixes used in AT&T syntax instructions translate to the dword, word, and byte keywords in Intel syntax (respectively). Also, Intel syntax uses a reverse order of oprands. So, in leal (%eax,%eax),%edx, you've got a lea instruction that's operating on longwords (dwords), is referencing a memory address eax + eax, and stores the result in edx. In Intel syntax, that's: lea dword edx,[eax+eax] (the dword can probably be omitted). - Mike