[PATCH] Improve the cost evaluation of LSR

[Wei Mi]

Hi,

I separated the existing and new cost model code, and used the following options to choose the cost model.

  -lsrmodel                                               - Choose the LSR cost model:
    =basic                                                -   enable basic cost model
    =aggr-unlimited                                       -   enable aggressive cost model and assume unlimited hard regs
    =aggr-estimate                                        -   enable aggressive cost model and estimate reg pressure
    =aggr-few                                             -   enable aggressive cost model and assume very few hard regs

-lsrmodel=basic is the existing implementation.  -lsrmodel=aggr-estimate is the new cost model. -lsrmodel=aggr-unlimited and -lsrmodel=aggr-few represent the cases when we have unlimited hardregs or very few hardregs.

It is very appreciated to try the new cost model on various platforms, so it can be improved based on more testcases.

Other changes includes adding two testcases and fixing an inst increase regression on x86.

Thanks,
Wei.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9429

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  include/llvm/CodeGen/BasicTTIImpl.h
  include/llvm/Target/TargetLowering.h
  lib/Analysis/TargetTransformInfo.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  lib/Transforms/Scalar/LoopStrengthReduce.cpp
  test/Transforms/LoopStrengthReduce/new_cost_1.ll
  test/Transforms/LoopStrengthReduce/new_cost_2.ll

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