rjmccall added a comment.

The last major conversation we had about this was this RFC I sent out about 
five years ago:

  https://lists.llvm.org/pipermail/llvm-dev/2016-January/094012.html

In that RFC, I specifically argued that we should not do this, and that it 
should only be considered undefined behavior to actually access memory through 
a misaligned pointer (for a particular definition of "access memory").  At 
Apple, we have made that a promise to our internal users, so even if we decide 
to do this, we will need to not do it on Darwin.  However, as I remember it, 
the LLVM community did not reach a consensus to adopt my recommendation, so in 
principle we still have the flexibility to start doing this.  I continue to 
believe that doing so would be a mistake.  At any rate, you should start by 
reading that thread.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D99791/new/

https://reviews.llvm.org/D99791

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