[PATCH] D18230: [SimplifyLibCalls] Simplify strlen to a subtraction for certain cases
Li Huang via llvm-commits
llvm-commits at lists.llvm.org
Mon Apr 11 20:31:03 PDT 2016
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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