Chandler Carruth 73100d8f33 [x86] Handle single input shuffles in the SSSE3 case more intelligently.
I spent some time looking into a better or more principled way to handle
this. For example, by detecting arbitrary "unneeded" ORs... But really,
there wasn't any point. We just shouldn't build blatantly wrong code so
late in the pipeline rather than adding more stages and logic later on
to fix it. Avoiding this is just too simple.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214680 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-04 01:14:24 +00:00
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