[PATCH] Added InstCombine transformation for combining two instructions icmp slt/sle/ult/ule/sge/sgt/uge/ugt (ashr/lshr (Const2) %A), (Const1)

[Ankur Garg]

Hi majnemer, dexonsmith, andreadb, suyog,

Hi,
I have added function to transform the two instructions of the type:
 icmp slt/sle/ult/ule/sge/sgt/uge/ugt (ashr/lshr (Const2) %A), (Const1) 

The patch for operators eq/ne has already been added in: http://reviews.llvm.org/D4068
This handles it for rest of the operators.



Please help in reviewing it.

Thanks.
Regards,
Ankur Garg

http://reviews.llvm.org/D5518

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