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...pe different approaches quickly"? I mean exploring different combine strategies :). With a model we are stuck with what it was designed to express. For instance, currently with SDISel there are no way to express something like paired loads, i.e., patterns like this: load @a, load @a + 4 => loadpair @a Because the DAGs needs to be single rooted. In C++ we do whatever we want (I am not saying it is easy ;).) > > It's funny, because I always thought the exact opposite: I felt like > there are constraints in the freedom to explore different approaches > precisely because the com...

Hi Daniel, Disclaimer: Haven't read the proposal yet. > TL;DR: We're planning to define GlobalISel Combine Rules using MIR syntax with a few bits glued on to interface with the algorithm and escape into C++ when we need to. Eventually, ISel rules may follow suit. I would rather avoid adding a dependency on yet another tablegen backend to the project unless we are confident it is