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9e699cc726
as vector shuffles did not work out well. Shuffles that produce double-wide vectors accurately represent the operation but make it hard to do anything with the results. I considered splitting them up into 2 shuffles, one to write each register separately, but there doesn't seem to be a good way to reunite them for codegen. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78437 91177308-0d34-0410-b5e6-96231b3b80d8
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