[PATCH] D130922: [InstCombine] Add support for stpncpy folding

[Martin Sebor via Phabricator via llvm-commits]

msebor updated this revision to Diff 452807.
msebor added a comment.

Changes in revision 1 of the patch include:

- Avoid annotating destination argument when bound is not known to be nonzero.
- Correct `stpncpy` return value to `strnlen(S, N)` rather than `strlen(S)`.
- Simplify common logic .
- Add tests.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D130922/new/

https://reviews.llvm.org/D130922

Files:
  llvm/include/llvm/Transforms/Utils/SimplifyLibCalls.h
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/simplify-libcalls-i16.ll
  llvm/test/Transforms/InstCombine/simplify-libcalls.ll
  llvm/test/Transforms/InstCombine/stpncpy-1.ll
  llvm/test/Transforms/InstCombine/strcpy-nonzero-as.ll
  llvm/test/Transforms/InstCombine/strncpy-1.ll
  llvm/test/Transforms/InstCombine/strncpy-4.ll

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