TEST - Logical Compare
•TEST reg/mem, reg/imm
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•Computes bit-wise logical AND between both operands and sets flags (including ZF) according to the computed result (which is discarded)
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•TEST EDX, EDX
•TEST EDX, 1
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•Suppose EDX contains 4  (100bin)
•100bin AND 100bin = 100bin  != 0   (ZF is cleared) 
•Suppose EDX contains 0  (0bin)
•0bin AND 1bin = 0bin   == 0  (ZF is set) 
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