In x86 and x64 assembly, the test instruction takes two operands and it performs a bitwise AND between the two operands. The result of the AND operation is discarded. But, the operation may modify the Sign Flag (SF), the Zero Flag (ZF), or the Parity Flag (PF). The...

The CBW, CWDE, and CDQE instructions in x86 and x64 assembly double the size of the source operand. The CBW or Convert Byte to Word instruction sign extends the content of the AL register to the AX register. The CWDE or Convert Word to Doubleword instruction sign...

The CWD instruction in the x86 and x64 assembly sign extends the content of AX and converts a word to a double word. The sign-extended value is stored in DX:AX registers where the DX register stores the most significant 16 bits and the AX register stores the least...

NOP (No Operation) is an assembly language instruction that does nothing. This instruction does not change the state of any registers or status flags except the EIP register in x86 assembly or RIP register in x64 assembly. It does not access any memory also. A NOP...