[PATCH] D74935: [LangRef][AliasAnalysis] Clarify `noalias` affects only modified objects

[Nuno Lopes via Phabricator via cfe-commits]

nlopes added a comment.

I agree with @aqjune that stating clearly the definition of object in this context.
See this example in the C spec:

  For example, the second call of f in g has undefined behavior because each of d[1] through d[49] is accessed through both p and q.
  
  void g(void) {
  extern int d[100];
  f(50, d + 50, d); // valid
  f(50, d + 1, d); // undefined behavior
  }

Restrict just guarantees that accesses are to disjoint memory locations, not that they point at different objects (in the sense of they were allocated separately).


Repository:
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https://reviews.llvm.org/D74935