[PATCH] D109537: [InstCombine] move extend after insertelement if both operands are extended

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: anton-afanasyev, andreil99, RKSimon.
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I was wondering how instcombine does on the examples in D109236 <https://reviews.llvm.org/D109236>, and we're missing what looks like a basic transform:

  inselt (ext X), (ext Y), Index --> ext (inselt X, Y, Index)

https://alive2.llvm.org/ce/z/z2aBu9

If this looks ok, then instcombine can handle the relatively simple tests in the other patch. 
So we might want to make those a bit longer to show the power of the more general approach in -aggressive-instcombine.


https://reviews.llvm.org/D109537

Files:
  llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
  llvm/test/Transforms/InstCombine/insert-ext.ll

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