Re: MI maximum

["Bob Donovan" <rjd@xxxxxxxxxx>]

On 05/10/2001 at 02:25:21 PM, owner-mi400@midrange.com wrote:

     NMI is input for Create Module.  Seems like a grandchild of P-Code.

More like a great-great-great-grandchild (p-code -> u-code -> v-code ->
w-code -> NMI). W-code and NMI are still in use.  The following is taken
from
http://www-1.ibm.com/servers/eserver/iseries/beyondtech/translator.htm:

In conjunction with development of the Integrated Language Environment
(ILE), the MI architecture was extended with additional computation and
branching instructions based on W-Code, which is the compiler intermediate
language generated by the latest generation of IBM compiler front ends. The
result of these extensions is commonly referred to as new MI (NMI).

All programs that execute on the AS/400 RISC models first pass through the
translator as a sequence of NMI instructions.  Original program model (OPM)
compilers produce original MI (OMI) instructions. An additional step in the
compile process converts OMI instruction streams to NMI instruction streams
that are semantically equivalent. ILE compiler front ends generate W-Code
instructions that are then converted to NMI instructions. Currently, there
are W-Code compiler front ends for the RPG, COBOL, C, C++, Modula-2 and CL
languages. Starting with Version 4 Release 2, Java? bytecodes can be
converted to NMI using the Create Java Program command. The translator
recognizes NMI instruction streams produced by all of these sources.

- Bob Donovan


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