Emad Jacob Maroun Emoun

## machine-module-pass-story.md

      
        
          
            
              
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                Emoun
                / machine-module-pass-story.md
            
            
              Last active
              April 7, 2021 09:15
            
              
                The story of LLVM's MachineModulePass
              
          
        
      
        
  
      
    The story of LLVM's MachineModulePass (from the perspective of T-CREST)

The idea of MachineModulePass is simple:
Where ModulePass is a pass over whole modules of LLVM-IR (IR) functions,
MachineModulePass would be a pass over whole modules of Machine-IR (MIR) functions.
Back in 2013, when the T-CREST project needed to implement passes over MIR, LLVM didn't have a good way of doing so.
Therefore, MachineModulePass was added to the T-CREST LLVM port to facilitate the needed functionality.^[1]
I'm guessing the hope was that LLVM would eventually provide a version of MachineModulePass that
could be used by T-CREST. However, this never happened.