[PATCH] D95122: [Libcalls, Attrs] Annotate libcalls with noundef

[Dávid Bolvanský via Phabricator via llvm-commits]

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I think we can use here same logic as for nonnull.

strlen(X) - X must be noundef.

for libcalls with size arg, we add noundef only if size is known and greater than 0 - so pointers must be noundef.


https://reviews.llvm.org/D95122

Files:
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/memcpy_chk-1.ll
  llvm/test/Transforms/InstCombine/mempcpy.ll
  llvm/test/Transforms/InstCombine/snprintf.ll
  llvm/test/Transforms/InstCombine/sprintf-1.ll
  llvm/test/Transforms/InstCombine/stpcpy-1.ll
  llvm/test/Transforms/InstCombine/strcpy-1.ll
  llvm/test/Transforms/InstCombine/strlen-1.ll
  llvm/test/Transforms/InstCombine/strlen-2.ll
  llvm/test/Transforms/InstCombine/strncmp-1.ll
  llvm/test/Transforms/InstCombine/strncpy-1.ll
  llvm/test/Transforms/InstCombine/strstr-1.ll

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