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Summary: Shuffle lowering widens the element size of a shuffle if elements are contiguous. This is sometimes help because wider element types have more shuffle options. If the shuffle is one of the arguments to a vselect this shuffle widening can introduce a bitcast between the vselect and the shuffle. This will prevent isel from selecting a masked operation. If the shuffle can be written equally efficiently with a different element size to match the vselect type we should change the shuffle type to allow masking. This patch does this conversion for all VALIGND/VALIGNQ sizes. It also supports turning 128-bit PALIGNR into VALIGND/VALIGNQ. This fixes the case shown in PR31018. I plan to add support for more operations in future patches. Reviewers: RKSimon, zvi, delena Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D26902 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287612 91177308-0d34-0410-b5e6-96231b3b80d8
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