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The type legalizer will visit the result before the operands. To avoid creating an illegal target specific node or falling back to scalarization, we need to manually split vector operands. This still doesn't handle the case of non-power of 2 operands which need to be widened. I'm not sure the type legalizer is ready for it. I think we would need to insert an INSERT_SUBVECTOR with the power of 2 type we want, with an undef first operand, and the non-power of 2 orignal operand as the vector to insert. Then fill in the neutral elements into the elements the padded elements. Alternatively we INSERT_SUBVECTOR into a neutral vector. From there we carry on splitting if needed to get to a legal type then do the target specific code. The problem with this is the type legalizer doesn't know how to widen an insert_subvector yet. We would need to add that including the handling for a non-undef first vector. Reviewed By: frasercrmck Differential Revision: https://reviews.llvm.org/D98292 |
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