[PATCH] D67122: [UBSan][clang][compiler-rt] Applying non-zero offset to nullptr is undefined behaviour

Roman Lebedev via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Tue Sep 3 14:59:53 PDT 2019


lebedev.ri marked 2 inline comments as done.
lebedev.ri added inline comments.


================
Comment at: llvm/docs/ReleaseNotes.rst:59
+  ``getelementptr inbounds`` can not change the null status of a pointer,
+  meaning it can not produce non-null pointer given null base pointer, and
+  likewise given non-null base pointer it can not produce null pointer; if it
----------------
xbolva00 wrote:
> Please add a reference to C/C++ standard that this is a UB.
It is irrelevant what semantics C/C++ standard has/doesn't have for whatever C/C++ construct,
this is talking about LLVM IR.


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https://reviews.llvm.org/D67122





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