Bruno Cardoso Lopes 5265412c13 [MLIR][LLVMIR] Import: add flag to prefer using unregistered intrinsics (#130685) ...

Currently, there is no common mechanism for supported intrinsics to be
generically annotated with arg and ret attributes. Since there are many
supported intrinsics around different dialects, the amount of work to
teach all them about these attributes is not trivial (though it would be
nice in the long term).

This PR adds a new flag `-prefer-unregistered-intrinsics` that can be
used alongside `--import-llvm` to always use `llvm.intrinsic_call`
during import time (ignoring dialect hooks for custom intrinsic
support).

Using this flag allow us to roundtrip the LLVM IR while eliminating a
whole set of differences coming from lack of arg/ret attributes on
supported intrinsics.

Note `convertIntrinsic` has to be moved to an implementation file
because it queries into `moduleImport` state, which is a fwd declaration
in `LLVMImportInterface.h`

2025-03-14 18:04:32 -07:00

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