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0889d65fd5
a bunch more improvements. Non-lane-crossing is fine, the key is that lane merging only makes sense for single-input shuffles. Not sure why I got so turned around here. The code all works, I was just using the wrong model for it. This only updates v4 and v8 lowering. The v16 and v32 lowering requires restructuring the entire check sequence. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222537 91177308-0d34-0410-b5e6-96231b3b80d8
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