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The compilers generate MI (nowadays NMI, "new MI"), then call an OS
component called the "Optimizing Translator", which generates PowerPC
machine instructions.

The compilers are programs in a library, and are said to be "above the
TIMI".

The translator consists of SLIC (System Licensed Internal Code) modules
(written in C++) which are not in a library, and are said to be "below
the TIMI". The same translator is called by all the compilers. It's
also used any time a program is re-translated, so all native code
generation is done there.

--Dave

McKown, John wrote:
Mark (offlist), Dave, and Vern:

Thanks much. I now understand what the book was trying to say. Which, of
course, leads to another question. The compilers compile to MI. Do the
compiler also compile to native Power instructions, __or__ do they pass
the compiled MI instructions off to a "system service" in the i
operating system which translates the MI instructions into native
instructions.

I ask because I've read about some command that you run when you upgrade
a system to "convert an object" which apparently "recompiles" the MI. Do
the compilers use this? Or is the native code generation done in the
compiler as well. Which would be silly in my opinion.

--
John McKown
Systems Engineer IV
IT

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