[PATCH] reenable gep merging in some constrainted cases

[Wei Mi]

Hi Quentin,

I put the disabling GEP merging and related heuristic tuning under an internal option and make it the default for now. By the way, I think it is better that LoopVectorizationLegality::isConsecutivePtr can check more than one level gep, just like what DecomposeGEPExpression does now in Basicaa.  I will try that in another patch.

Thanks,
Wei.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9865

Files:
  lib/Transforms/InstCombine/InstructionCombining.cpp
  test/Transforms/InstCombine/gep-merge1.ll
  test/Transforms/InstCombine/gep-merge2.ll
  test/Transforms/InstCombine/getelementptr.ll

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