[PATCH] D147714: [Attr] Introduce [[clang::nonportable_musttail]] as less strict version of [[clang::musttail]]

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 added a comment.

In D147714#4446780 <https://reviews.llvm.org/D147714#4446780>, @yamt wrote:

>> musttail provide assurances that the tail call can be optimized on all targets.
>
> Such a definition doesn't make much sense because for some targets tail call optimization isn't available at all.
> Eg. Wasm w/o tail call proposal, xtensa windowed abi.
>
> So I'm not sure what's the point of the new attribute. It seems simpler to fix the existing musttail attribute.

I agree, I consider the original design of this feature as a mistake, which made this attribute kinda unreliable and useless.. I dont think people are willing to just change existing impl of musttail attribute...


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https://reviews.llvm.org/D147714