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Weird Assembler instructions

 
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Corruptor
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PostPosted: Tue Apr 23, 2013 4:54 am    Post subject: Weird Assembler instructions Reply with quote
Code:
worldedit.exe+1B2660 - 83 7C 24 08 00        - cmp dword ptr [esp+08],00
worldedit.exe+1B2665 - 56                    - push esi
worldedit.exe+1B2666 - 8B F1                 - mov esi,ecx
worldedit.exe+1B2668 - 74 05                 - je worldedit.exe+1B266F


Basically, my question is: what does that cmp do there? The mov instruction resets the flags anyways, so the je cant possibly refer to the cmp. But what does it do there then?
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Fresco
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PostPosted: Tue Apr 23, 2013 10:59 am    Post subject: Reply with quote
why not ?
the cmp instruction sets the FLAGS register it does not matter if you have a push and a mov in the between
btw the mov does not reset the FLAGS it just copies ecx's value into esi's
so yes, the je instruction is referring to that cmp above it
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mgr.inz.Player
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PostPosted: Tue Apr 23, 2013 4:53 pm    Post subject: Reply with quote
@Corruptor
Yes, this a common thing. This "separation" of compare instruction and conditional-jump.
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