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mlir_interoperation.md

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Generating executables through MLIR

As mentioned previously, xDSL can interoperate with MLIR as its backend. As this requires an installation, and therefore a compilation, of a lot of the LLVM project and MLIR, this functonality is not distributed with xDSL by default. To actually leverage from this functionality, first clone and build MLIR. Please follow: https://mlir.llvm.org/getting_started/

Next, mlir-opt, mlir-translate and clang need to be in the path:

export PATH=<insert-your-path>/llvm-project/build/bin:$PATH

Given an input file input.mlir, that contains IR with only the mirrored dialects found in xdsl/dialects (arith, builtin, cf, func, llvm, memref, and scf), run:

mlir-opt --convert-scf-to-cf --convert-cf-to-llvm --convert-func-to-llvm \
         --convert-arith-to-llvm --expand-strided-metadata --normalize-memrefs \
         --memref-expand --fold-memref-alias-ops --finalize-memref-to-llvm \
         --reconcile-unrealized-casts input.mlir | mlir-translate --mlir-to-llvmir > tmp.ll

The generated tmp.ll file contains LLVM IR, so it can be directly passed to the clang compiler. Notice that a main function is required for clang to build. The functionality is tested with the MLIR git commit hash: d401987fe349a87c53fe25829215b080b70c0c1a