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cad1711154
lowering scheme. Currently, this just directly bails to the fallback path of splitting the 256-bit vector into two 128-bit vectors, operating there, and then joining the results back together. While the results are far from perfect, they are *shockingly* good for what we're doing here. I'll be layering the rest of the functionality on top of this piece by piece and updating tests as I go. Note that 256-bit vectors in this mode are still somewhat WIP. While I think the code paths that I'm adding here are clean and good-to-go, there are still a lot of 128-bit assumptions that I'll need to stomp out as I march through the functional spread here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215637 91177308-0d34-0410-b5e6-96231b3b80d8
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