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(nasm.info)Section 5.7

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5.7. `CPU': Defining CPU Dependencies
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   The `CPU' directive restricts assembly to those instructions which
are available on the specified CPU.

   Options are:

   * `CPU 8086' Assemble only 8086 instruction set

   * `CPU 186' Assemble instructions up to the 80186 instruction set

   * `CPU 286' Assemble instructions up to the 286 instruction set

   * `CPU 386' Assemble instructions up to the 386 instruction set

   * `CPU 486' 486 instruction set

   * `CPU 586' Pentium instruction set

   * `CPU PENTIUM' Same as 586

   * `CPU 686' P6 instruction set

   * `CPU PPRO' Same as 686

   * `CPU P2' Same as 686

   * `CPU P3' Pentium III (Katmai) instruction sets

   * `CPU KATMAI' Same as P3

   * `CPU P4' Pentium 4 (Willamette) instruction set

   * `CPU WILLAMETTE' Same as P4

   * `CPU PRESCOTT' Prescott instruction set

   * `CPU IA64' IA64 CPU (in x86 mode) instruction set

   All options are case insensitive. All instructions will be selected
only if they apply to the selected CPU or lower. By default, all
instructions are available.