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(nasm.info)Section B.4.317

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B.4.317. `TEST': Test Bits (notional bitwise AND)
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     TEST r/m8,reg8                ; 84 /r                [8086]
     TEST r/m16,reg16              ; o16 85 /r            [8086]
     TEST r/m32,reg32              ; o32 85 /r            [386]

     TEST r/m8,imm8                ; F6 /0 ib             [8086]
     TEST r/m16,imm16              ; o16 F7 /0 iw         [8086]
     TEST r/m32,imm32              ; o32 F7 /0 id         [386]

     TEST AL,imm8                  ; A8 ib                [8086]
     TEST AX,imm16                 ; o16 A9 iw            [8086]
     TEST EAX,imm32                ; o32 A9 id            [386]

   `TEST' performs a `mental' bitwise AND of its two operands, and
affects the flags as if the operation had taken place, but does not
store the result of the operation anywhere.