[PATCH] [TTI/CostModel] improve TTI::getGEPCost and use it in CostModel::getInstructionCost

[Jingyue Wu]

Some changes

1. strip pointer casts before checking whether Ptr is a GlobalValue

2. support Ptr == nullptr

3. getGEPCost still takes ArrayRef<const Value *> as operands

4. in the direction of supporting opaque pointer types, getGEPCost takes the source pointer element type as a parameter.

5. fixed partial.ll. With the new getGEPCost, the loop size in @test1 is 13 and thus the loop can be partially unrolled. Added extra instructions so that the loop size remains 16.


http://reviews.llvm.org/D9819

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  lib/Analysis/CostModel.cpp
  lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
  test/Analysis/CostModel/ARM/gep.ll
  test/Analysis/CostModel/no_info.ll
  test/Transforms/LoopUnroll/X86/partial.ll
  test/Transforms/LoopVectorize/X86/metadata-enable.ll

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