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These are super simple. They even take precedence over crazy instructions like INSERTPS because they have very high throughput on modern x86 chips. I still have to teach the integer shuffle variants about this to avoid so many domain crossings. However, due to the particular instructions available, that's a touch more complex and so a separate patch. Also, the backend doesn't seem to realize it can commute blend instructions by negating the mask. That would help remove a number of copies here. Suggestions on how to do this welcome, it's an area I'm less familiar with. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217744 91177308-0d34-0410-b5e6-96231b3b80d8
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