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(nasm.info)Section B.4.245

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B.4.245. `POPAx': Pop All General-Purpose Registers
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     POPA                          ; 61                   [186]
     POPAW                         ; o16 61               [186]
     POPAD                         ; o32 61               [386]

   * `POPAW' pops a word from the stack into each of, successively,
     `DI', `SI', `BP', nothing (it discards a word from the stack which
     was a placeholder for `SP'), `BX', `DX', `CX' and `AX'. It is
     intended to reverse the operation of `PUSHAW' (see *Note Section
     B.4.264::), but it ignores the value for `SP' that was pushed on
     the stack by `PUSHAW'.

   * `POPAD' pops twice as much data, and places the results in `EDI',
     `ESI', `EBP', nothing (placeholder for `ESP'), `EBX', `EDX', `ECX'
     and `EAX'. It reverses the operation of `PUSHAD'.

   `POPA' is an alias mnemonic for either `POPAW' or `POPAD', depending
on the current `BITS' setting.

   Note that the registers are popped in reverse order of their numeric
values in opcodes (see *Note Section B.2.1::).