[PATCH] D99791: [CGCall] Annotate pointer argument with alignment

[John McCall via Phabricator via cfe-commits]

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.


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