In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. The flags SF, ZF, PF, CF, OF and AF are modified while the result of the AND is discarded. There are 9 different opcodes for the TEST instruction depending on the type and size of the operands. It can compare 8bit, 16bit or 32bit values. It can also compare registers, immediate values and register indirect values.[1]
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