[PATCH] InstCombine: form shuffles from wider range of insert/extractelements

[Tim Northover]

Hi all,

Sequences of insertelement/extractelements are sometimes used to build vectors; this code tries to put them back together into shuffles, but could only produce a completely uniform shuffle types (<N x T> from two <N x T> sources).
    
This should allow shuffles with different numbers of elements on the input and output sides as well.

Does it look reasonable?

Cheers.

Tim.


http://llvm-reviews.chandlerc.com/D2987

Files:
  lib/Target/AArch64/AArch64InstrNEON.td
  lib/Transforms/InstCombine/InstCombineVectorOps.cpp
  test/Transforms/InstCombine/insert-extract-shuffle.ll
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