efriedma added a comment.

Sure, I'm happy with the second option.

> Alignment at the call site might be higher than of the copy, breaking with 
> the idea that the call site and callee "properties" match. Though, the 
> attributes can probably be kept in sync if we teach the relevant parts.

The meaning of the "align" attribute with byval is weird from any perspective: 
it specifies both the alignment of the allocation, and the required alignment 
of the input.  It would be nice to separate those at some point.  (That would 
probably mean something like `byval(<ty>, <align>)` to specify the alignment of 
the copied memory, and then the `align` attribute would just specify the 
alignment of the input, like it does for other calls.)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D79636/new/

https://reviews.llvm.org/D79636



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