[PATCH] D18230: [SimplifyLibCalls] Simplify strlen to a subtraction for certain cases

[Li Huang via llvm-commits]

lihuang updated this revision to Diff 53356.
lihuang added a comment.

Updated the changed. Added a helper function in ValueTracking.cpp/h to check if a given GEP is based on a pointer to string and is indexing into that string. This helper function can be used by both getConstantStringInfo() and optimizeStrlen().


http://reviews.llvm.org/D18230

Files:
  include/llvm/Analysis/ValueTracking.h
  lib/Analysis/ValueTracking.cpp
  lib/Transforms/Utils/SimplifyLibCalls.cpp
  test/Transforms/InstCombine/strlen-1.ll

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