Dark Byte Site Admin Reputation: 457 Joined: 09 May 2003 Posts: 25262 Location: The netherlands
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Posted: Mon May 08, 2017 8:46 am Post subject: |
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both 81 and 83 are a dword compare. One just uses less bytes
e.g compare if an 4 byte address is 1 can be done by
Code: |
83 3A 01 - cmp dword ptr [rdx],01 { 1 }
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now if the 4 byte value at [rdx] contains the value 00000001 then the result will be true, BUT if the value at [rdx] is 01000001 then the result will be false
as you see, it does compare the full dword and acts exactly the same , but takes less bytes then
Code: |
81 3A 01000000 - cmp [rdx],00000001 { 1 }
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