gcc compiler for pdp10

[Martin Chaney]

Hi,

I'm am the proprietor of a gcc compiler for the PDP10 architecture.

(This is a compiler previously worked on by Lars Brinkhoff who left XKL 
some while before I joined XKL.  It's possible some of you may have been 
familiar with him or the compiler from that time.)

The compiler is currently in a state where it is synched with the both 
the 4.3 and 4.4 branches, and it passes the testsuite tests (with the 
exception of some I've flagged as expected failures for the pdp10).

My employer is happy to release my work on the gcc compiler back to the 
gcc community and I've sent in a request for the necessary forms.

The PDP10 architecture is unusual in various ways that distinguish it 
from the mainstream architectures supported by the gcc compiler and this 
has made the development of this compiler a significant task.  
Undoubtedly I've made customizations in inappropriate ways.  I'm seeking 
contacts with people who might be able to advise me on how to cleanup my 
implementation to reduce the amount of #ifdef __PDP10_H__ I've sprinkled 
liberally throughout the source.  Also, if its possible to get simple 
changes made to prevent breaking my PDP10 version and that are otherwise 
innocuous that would be wonderful.  For example, the PDP10 word size is 
36 bits;  Fairly recently people have taken to writing code that assumes 
word size is a power of 2 even when it's straightforward to write in a 
manner that doesn't make that assumption.

Considering the large number of files customized to get the PDP10 
compiler working, I'm not sure whether it's possible to get it to build 
directly from the gcc trunk, but it would be nice to work toward that goal.

Some other things which distinguish the PDP10 architecture from 
assumptions in the gcc code base include: its variety of formats of 
pointers only one of which can be viewed as an integer and that one is 
capable of referencing only word aligned data, a functional difference 
between signed and unsigned integers, and peculiarities to the use of 
PDP10 byte arrays which are very difficult to describe.

Any help or advise would be appreciated.

Martin Chaney
XKL, LLC