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

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/

Hi!

I've did what Jim Laskey wrote but llc didn't reckognize my regalloc
option.

So I moved my allocator implementation into seperate folder within CodeGen
and wrote separate makefile for it (like in "Writing an LLVM pass"
tutorial). But when I run "make" from LLVMOBJDIR it doesn't enter
the
RegAlloc directory and when linking llc an error like
"createGraphColoringRegAlloc not defined" occurs.

What am I doing wrong? :)

On 8/3/06, Chris Lattner <sabre at nondot.org> wrote:
> 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

BTW, do you know what the extension cygwin uses instead of ".so"?

Thanks,

Tony.

-- 
Nae king! Nae quin! Nae laird! Nae master! We willnae be fooled again!
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Hi,

Op 20-aug-06, om 15:18 heeft Anton Vayvod het volgende geschreven:
> So I moved my allocator implementation into seperate folder within  
> CodeGen and wrote separate makefile for it (like in "Writing an  
> LLVM pass" tutorial). But when I run "make" from LLVMOBJDIR
it
> doesn't enter the RegAlloc directory and when linking llc an error  
> like "createGraphColoringRegAlloc not defined" occurs.
Did you add your new folder to the (PARALLEL_)DIRS variable within  
CodeGen's Makefile?
>
> llc -load yourregalloc.so -regalloc=yours ...
>
> -Chris
>
> BTW, do you know what the extension cygwin uses instead of ".so"?
I managed to load a pass without any extension (using opt or llvm- 
ld), so maybe the following works: llc -load /path/to/yourregalloc - 
regalloc=...

Kind regards,

Bram Adams
GH-SEL, INTEC, Ghent University

Dear Anton,

    you can add your register allocator strait iin the
"lib/CodeGen/Passes.cpp", and then 're-make' it:
"makellvm llc", on the
top of lib/CodeGen. It is faster than running make from LLVMOBJDIR. The
problem is that it only add to llc the changes on the lib/CodeGen
directory. If you change other parts, a make from LLVMOBJDIR will
synchronize it.

Try adding code like this to your Passes.cpp file:

//===---------------------------------------------------------------------===//
///
/// RegAlloc command line options.
///
//===---------------------------------------------------------------------===//
namespace {
  cl::opt<RegisterRegAlloc::FunctionPassCtor, false,
          RegisterPassParser<RegisterRegAlloc> >
  RegAlloc("regalloc",
           cl::init(&createChordalRegisterAllocator),
           cl::desc("Register allocator to use: (default =
chordal)"));
}

All the best,

Fernando
> Hi!
>
> I've did what Jim Laskey wrote but llc didn't reckognize my
regalloc option.
>
> So I moved my allocator implementation into seperate folder within CodeGen
> and wrote separate makefile for it (like in "Writing an LLVM
pass"
> tutorial). But when I run "make" from LLVMOBJDIR it doesn't
enter the
> RegAlloc directory and when linking llc an error like
> "createGraphColoringRegAlloc not defined" occurs.
>
> What am I doing wrong? :)