[LLVMdev] Bi-Endian Compiler

[Herbie Robinson]

I have been quietly working on a port of LLVM to Stratus VOS.  The OS is 
always big endian (because customers need to migrate data to new 
hardware quickly and can't afford to convert).  This entails presenting 
a big endian programming model no matter what the hardware does.  We did 
this about 15 years ago with the Stratus compilers and GCC.  We offered 
the GCC changes back to the community, but the GCC folks declined to 
take them...

In my copious spare time, I've already written (but not debugged) an 
LLVM pass that reverses the endianess of the underlying processor.  The 
LLVM IR is actually quite good for this.  Believe it or not, the hard 
part is actually dealing with initialization!

I am leaving on vacation as soon as my GPS maps get updated; so, I don't 
have time to read your paper, now.  I will look at it when I get back.  
Perhaps we can collaborate.  If nothing else, I participated 
peripherally in the Stratus implementation.  I would like to say a lot 
more, but I need to hit the road...


On 7/30/15 4:36 AM, Umesh Kalappa wrote:
> Hi Guys,
>
> We are trying to come up with Bi-Endian(neutral endiness) compiler
> using the LLVM.
>
> For a introduction .
>
> http://www.drdobbs.com/architecture-and-design/writing-a-bi-endian-compiler/240003090
>
> Did someone from the group ,aware of such project .
>
>
> Thank you
> ~Umesh
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