Changeable LLVM inliner threshold?

rogerdpack · November 14, 2021, 7:01am

Might be nice to have access to this LLVM Inliner Threshold setting:

crystal-lang/crystal/blob/master/src/compiler/crystal/compiler.cr#L573

    
      
          @pass_manager_builder : LLVM::PassManagerBuilder?
          
          
private def pass_manager_builder
            @pass_manager_builder ||= begin
              registry = LLVM::PassRegistry.instance
              registry.initialize_all
          
          
    builder = LLVM::PassManagerBuilder.new
              builder.opt_level = 3
              builder.size_level = 0
              builder.use_inliner_with_threshold = 275
              builder
            end
          end
          
          
private def process_wrapper(command, args = nil)
            print_command(command, args) if verbose?
          
          
  status = yield command, args
          
          
  unless status.success?

I was doing a micro benchmark and was surprised to see that it ran like twice as fast if I adjusted that up to 5K. Also made my executable like 6MB instead of 1MB but sometimes speed is worth the tradeoff (might even want to make that number larger by default for release builds? Dunno.)

Thanks.

somewhat related: https://bugs.ruby-lang.org/issues/12599

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Changeable LLVM inliner threshold?

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