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Comparing 2 registers

 
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nero1232
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PostPosted: Thu Mar 16, 2017 5:34 am    Post subject: Comparing 2 registers Reply with quote

Hi,

I am comparing 2 registers like this:

cmp rcx,rdx
jge clearmyarray



RCX = 8
RDX = game.exe+offset1 = 8

However in memory RDX is showing as 0000100000000008, however in cheat engine the value is 8. I am guessing this is a signed value?

My compare is failing because RCX is just 000000000000008 and RDX is 0000100000000008. How can I compare while ignoring the sign bit as I just want to compare if RCX and RDX == 8?

Thanks
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pellik
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PostPosted: Thu Mar 16, 2017 6:11 am    Post subject: Reply with quote

cmp cl, dl
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nero1232
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PostPosted: Thu Mar 16, 2017 6:23 am    Post subject: Reply with quote

pellik wrote:
cmp cl, dl


Thanks this works but what does it do?
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pellik
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PostPosted: Thu Mar 16, 2017 6:25 am    Post subject: Reply with quote

http://stackoverflow.com/questions/15191178/assembly-programming-memory-allocating-eax-vs-ax-ah-al
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nero1232
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PostPosted: Thu Mar 16, 2017 6:28 am    Post subject: Reply with quote

pellik wrote:
questions/15191178/assembly-programming-memory-allocating-eax-vs-ax-ah-al


Perfect cheers
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