Re: Anyway to produce the assembly or C language from a compiled RPG program?

MI is an OPM language that was effectively the assembler language of the S/38 and OPM AS/400. There is a compiler option on the OPM compilers to print it out if you want to see it.

W-code is a platform independent assembler-like target language used by IBM on a number of systems and there was proprietary optimization technology built around it. IBM never published the specification. If I understand correctly a modified version of w-code is used on IBM i. I _think_ it was extended to accommodate packed numbers. It was originally known as MI-prime and subsequently (somewhat confusingly) this is now also referred to as MI - but it isn't the same MI.

Does that make any sense?


Jon P.

On Aug 7, 2023, at 1:02 PM, Jack Woehr via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx> wrote:

On Mon, Aug 7, 2023 at 1:45 PM Jon Paris <jon.paris@xxxxxxxxxxxxxx> wrote:

This would pre-suppose that RPG (or indeed any language on IBM i) compiles
down to C. They don't. All ILE compilers output a variant of IBM's w-code
intermediate code. That is then translated down to machine instructions.
In the case of OPM compilers, they produced MI as the intermediate language.

Jon, can you explain a bit about the difference between MI and W-Code (or
point to some such discussion)? Thanks.

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