Pops the 64-bit value on the top of the stack into a register.

    Format

      $POP64  reg

1  –  Parameters

 reg

    Register into which the macro places the 64-bit value from the
    top of the stack.

2  –  Description

    $POP64 takes the 64-bit value at the top of the stack and places
    it in a register using longword instructions. This is to avoid
    using quadword instructions when an alignment fault should be
    avoided, but restoring all 64 bits is necessary.