[Arcilator] Move pipeline into separate library.

[SimonEbner]

Allow re-use of the arcilator library. Split up the large pipeline into finer grained stages and move into its own library.

populateHwModuleToArcPipeline is split into:

• arcPreprocessingPipeline
• arcConversionPipeline
• arcOptimizationPipeline
• arcStateLoweringPipeline and
• arcStateAllocationPipeline

Flags to customize passes are moved from the binary into the corresponding pipeline options.

[SimonEbner]

Hi. I'd be interested in using arcilator in a more modular fashion. Are you open to moving some of its pieces out of the binary into a library? Happy to re-arrange this if you think this should be organized differently.

[maerhart]

Hi @SimonEbner, factoring it into individual pipelines is a very nice idea!

Can you put the pipeline implementation in include/Tools/arcilator and lib/Tools/arcilator instead of tools/arcilator directly?
It would also be nice to make them regular MLIR pipelines, i.e. options inherit from pipeline options and they can be registered. For example, see the RTG pipelines here: https://github.com/llvm/circt/blob/main/lib/Dialect/RTG/Transforms/RTGPassPipelines.cpp https://github.com/llvm/circt/blob/main/include/circt/Dialect/RTG/Transforms/RTGPassPipelines.h

Thanks!

[SimonEbner]

Thanks! Updated accordingly.

[maerhart]

LGTM
Thanks!

[SimonEbner]

Thanks both. Updated and also fixed/updated the logic around populateArcToLLVMPipeline in arcilator.cpp