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b19c087aa7
Summary: Vectors built with zeros and elements in the same order as another (source) vector are optimized to be built using a single insertps instruction. Also optimize when we move one element in a vector to a different place in that vector while zeroing out some of the other elements. Further optimizations are possible, described in TODO comments. I will be implementing at least some of them in the near future. Added some tests for different cases where this optimization triggers. Reviewers: nadav, delena, craig.topper Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D3521 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208271 91177308-0d34-0410-b5e6-96231b3b80d8
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