[PATCH] D20289: [InstCombine] check vector elements before trying to transform LE/GE vector icmp (PR27756)

[Sanjay Patel via llvm-commits]

spatel created this revision.
spatel added reviewers: jmolloy, majnemer, chandlerc.
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Fix a bug introduced with rL269426 :
[InstCombine] canonicalize* LE/GE vector integer comparisons to LT/GT (PR26701, PR26819)

We were assuming that a ConstantDataVector / ConstantVector / ConstantAggregateZero operand of an ICMP was composed of ConstantInt elements, but it might have ConstantExpr or UndefValue elements. Handle those appropriately.

http://reviews.llvm.org/D20289

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/icmp-vec.ll

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