[PATCH] D123819: [InstCombine] Fold strlen and strnlen recursively.

[Martin Sebor via Phabricator via llvm-commits]

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This patch in the `strnlen` series introduces a recursive function, `LibCallSimplifier::minStringLength()`, to handle calls with pointer arguments involving nested conditional expressions.  This also enhances the folding of `strlen`.  For `strnlen`, only constant bounds are handled.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123819

Files:
  llvm/include/llvm/Transforms/Utils/SimplifyLibCalls.h
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/strlen-1.ll
  llvm/test/Transforms/InstCombine/strlen-4.ll
  llvm/test/Transforms/InstCombine/strnlen-2.ll
  llvm/test/Transforms/InstCombine/strnlen-3.ll
  llvm/test/Transforms/InstCombine/strnlen-4.ll
  llvm/test/Transforms/InstCombine/strnlen-5.ll

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