llvm dev - Aug 2006 - [LLVMdev] Adding register allocator to LLVM

Hi!

I'm developing a register allocator and need it to be available as an option
for llc tool. I used to edit /lib/CodeGen/Passes.cpp for this aim but after
yesterday's update these options are defined somewhere else and I can't
find
the place.

Thanks for your help.

Tony.
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On 8/3/06, Anton Vayvod <avayvod at gmail.com>
wrote:
>
>  Hi!
>
> I'm developing a register allocator and need it to be available as an
> option for llc tool. I used to edit /lib/CodeGen/Passes.cpp for this aim
but
> after yesterday's update these options are defined somewhere else and I
> can't find the place.
>
> Thanks for your help.
>
> Tony.
>
Hi again!

I've found the place I needed looking carefully at
regAllocLinearScan.cppfile

Thanks.

Tony.
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Welcome to the world of pluggable machine passes.  This work was done  
to lighten the load of some llvm tools, ie., only link in the  
register allocators and instruction schedulers that are actually  
needed in a particular circumstance.  I guess I will have to write  
this up, but generally it works like this.

In your register allocator .cpp file add the following include;

   #include ""llvm/CodeGen/RegAllocRegistry.h""

In your register allocator .cpp file define a create function in the  
form;

   FunctionPass *createMyRegisterAllocator() {
     return new MyRegisterAllocator();
   }

and the "installing" static constructor declaration, in the form;

   static RegisterRegAlloc myRegAlloc("myregalloc",
     "  my register allocator help string",
     createMyRegisterAllocator);

To force the load/linking of your register allocator into the llc/lli  
tools, add your create function's global declaration to "Passes.h"
and add a "pseudo" call line to "llvm/Codegen/ 
LinkAllCodegenComponents.h" .

And that should do it.

Cheers,

-- Jim








On Aug 3, 2006, at 6:00 AM, Anton Vayvod wrote:
> Hi!
>
> I'm developing a register allocator and need it to be available as  
> an option for llc tool. I used to edit /lib/CodeGen/Passes.cpp for  
> this aim but after yesterday's update these options are defined  
> somewhere else and I can't find the place.
>
> Thanks for your help.
>
> Tony.
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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On Thu, 3 Aug 2006, Jim Laskey wrote:
> To force the load/linking of your register allocator into the llc/lli
tools,
> add your create function's global declaration to "Passes.h"
and add a
> "pseudo" call line to
"llvm/Codegen/LinkAllCodegenComponents.h" .
Another note: with this new functionality you should be able to 
dynamically load register allocators.  Build your register allocator into 
a dynamic library, like this: 
http://llvm.org/docs/WritingAnLLVMPass.html#makefile

They you should be able to use:

llc -load yourregalloc.so -regalloc=yours ...

-Chris

-- 
http://nondot.org/sabre/
http://llvm.org/