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Masked loads and store fit naturally with MVE, the instructions being easily predicated. This adds lowering for the simple cases of masked loads and stores. It does not yet deal with widening/narrowing or pre/post inc, and so is currently behind an option. The llvm masked load intrinsic will accept a "passthru" value, dictating the values used for the zero masked lanes. In MVE the instructions write 0 to the zero predicated lanes, so we need to match a passthru that isn't 0 (or undef) with a select instruction to pull in the correct data after the load. Differential Revision: https://reviews.llvm.org/D67186 llvm-svn: 371932
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