[llvm-commits] [PATCH] Added TCE target to llvm-gcc

[Mikael Lepistö]

Mikael Lepistö wrote:
> Duncan Sands wrote:
>   
>> Hi, are you planning to get this target into mainline gcc
>> at some point?  
>>     
> I don't think that it's possible since we generate new version of our 
> backend for each processor configuration (with different instruction 
> sets and registers) and load it as a plugin to our own llc replacement. 
> This replacement also converts llvm bitcode to our native format.
>   
>> Why do you only emit bitcode - are you
>> planning to implement an LLVM code generator for your
>> target?
>>     
>
> In short: We already have LLVM code generator, but it's quite different 
> approach that usual llvm backends...
>
> We do linking and optimizing on llvm IR (also linking static newlib to 
> program). After we have fully linked bitcode we build code generation 
> plugin which contains information about customizes resources of the 
> processor. That plugin generates our native IR out of bitcode and use 
> generated IR for scheduling program to a specific processor configuration.
>
> So basically bitcode programs are universal programs, which can be 
> converted to run on any different processor configuration. For more 
> information on tce.cs.tut.fi page contains tutorials and videos about 
> the system. There is also a masters thesis about to be released (in few 
> months) which covers our compiler chain.
>
>   
>> Finally, does this break the llvm-gcc build if
>> llvm-gcc is configured with LLVM support disabled?
>>   
>>     
> Looks like it compiled fine without special --target setting. However 
> --target=tce-llvm without --enable-llvm failed. Patch has really small 
> changes to configure system just for recognizing that new 
> --target=tce-llvm target exists.
>   
>> Ciao,
>>
>> Duncan.
>>   
>>     
> Mikael
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>   
Hi,

Any news if this patch could be applied and which modifications it would 
need? I attached the latest version of the patch which is made towards 
llvm-gcc trunk with "svn diff -x -u".

This patch would help greatly our users  to be able to use llvm-gcc 
sources gotten directly from llvm, instead using our patched version. 
Also it would help a bit maintaining llvm trunk synchronized branch of 
the tce toolset.

Mikael Lepistö
http://llvm.org/ProjectsWithLLVM/#tta-tce


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