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Dark Byte
Site Admin
Reputation: 457
Joined: 09 May 2003
Posts: 25262
Location: The netherlands

PostPosted: Mon May 08, 2017 8:46 am    Post subject:

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 }

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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sbryzl
Review: Approve
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ReviewPosted: Mon May 08, 2017 8:56 am


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