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b00418af67
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Author SHA1 Message Date
Nadav Rotem
b00418af67 Add a new DAGCombine optimization for BUILD_VECTOR. 
If all of the inputs are zero/any_extended, create a new simple BV
which can be further optimized by other BV optimizations.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143297 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-10-29 21:23:04 +00:00