Author: James Robertson
Date: 11:50:59 01/27/99
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On January 27, 1999 at 01:32:28, Eugene Nalimov wrote: >On January 26, 1999 at 22:38:37, James Robertson wrote: > >>Once again I show my absolute ignorance of assembly with these two questions: >>I am trying to acces the 3rd [+ 4th] byte of a register. How? E.g., what is next >>after al, ah, ? >>How do I pop something off the stack without moving the stack pointer? >> >>Thanks, >>James > >1. Use shift instruction. E.g. > shr eax, 16 > mov byte ptr [esi], al > You can also use rotate instruction (it'll not destruct > other bytes): > ror eax, 16 > mov byte ptr [esi], al > ror eax, 16 > But if I remember it correctly, rotate is worse than shift > (cannot be executed in parallel) on both Pentium and P6 family. >2. mov reg32, dword ptr [esp] > >Eugene Ok.... that would work. Because I already have stuff stored in ax, and I know the exact values I want to put into the 'e' part, I wrote: or eax,0xeeee0000 and eax,0x0000ffff or eax,0xeeee0000 where eeee=what I want to put in. This seems to work. Are there any problems I am missing? James
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