[PATCH] D128364: [InstCombine] Look through more casts when folding memchr and memcmp

[Martin Sebor via Phabricator via llvm-commits]

msebor updated this revision to Diff 439819.
msebor marked an inline comment as done.
msebor added a comment.

- Have `getConstantStringInfo` fail for empty array slices when `TrimAtNul` is set.
- Have `GetStringLengthH` fail for empty array slices.
- Gracefully handle empty array slices in `memchr` and `memrchr` folders.
- Add tests.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128364/new/

https://reviews.llvm.org/D128364

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/memchr-10.ll
  llvm/test/Transforms/InstCombine/memchr-9.ll
  llvm/test/Transforms/InstCombine/memcmp-7.ll
  llvm/test/Transforms/InstCombine/memcmp-8.ll
  llvm/test/Transforms/InstCombine/memrchr-7.ll
  llvm/test/Transforms/InstCombine/strcall-no-nul.ll
  llvm/test/Transforms/InstCombine/strnlen-1.ll

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