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8c71e440a2
repeated 128-bit lane shuffles of wider vector types and use it to lower 256-bit v16i16 vector shuffles where applicable. This should let us perfectly lowering the pattern of pshuflw and pshufhw even for AVX2 256-bit patterns. I've not added AVX-512 support, but it should be trivial for someone working on that to wire up. Note that currently this generates bad, long shuffle chains because we don't combine 256-bit target shuffles. The subsequent patches will fix that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230751 91177308-0d34-0410-b5e6-96231b3b80d8 |
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