obstacles to an iseries risc compiler -- MI400

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An academic question.

What makes the writing of a non ibm powerpc compiler impossible on the iseries?

The pgm validation value looks to be one. It prevents you from restoring your pgm after a system crash.

Is there sufficient undocument knowledge of the pgm hdr, passed on over the years from guru to guru, to create a working pgm object?

The undocumented ibm extensions to the powerpc assembler code. It should be doable to figure that out, right?

The system state, user state issue. Would this rogue risc compiler be able to create the system state segments of the pgm object?

-Steve Richter

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