Arnold Schwaighofer a670a0a3aa LoopVectorize: We don't need an identity element for min/max reductions
We can just use the initial element that feeds the reduction.

  max(max(x, y), z) == max(max(x,y), max(x,z))

radar://13723044

llvm-svn: 181141
2013-05-05 01:54:42 +00:00
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