Re: Tuple and changes for m68k with -malign-int

On Tue, 2025-06-17 at 13:21 +0200, Geert Uytterhoeven wrote:
> > I'm not sure how this is relevant at all. What is the gross profit of the NetBSD organization?
> 
> IOW, you can have plenty of ABIs, if you have the manpower to create
> and maintain them.

Both Debian and Gentoo want to maintain the 4 bytes alignment ABI in the long term.

I don't think there is a point to continue to maintain the 2 bytes alignment ABI.

For whom would we do that?

> > > > > Is this a Rust issue, or an LLVM issue?
> > > > 
> > > > https://github.com/M680x0/M680x0-mono-repo/issues/10
> > > 
> > > So you mean it's an LLVM issue.
> > 
> > It's an issue on many projects that use things like tagged pointers etc.
> 
> I know.  If you want to tag pointers, it is your responsibility to use
> unused bits (Hi Apple 24-bit).  When using the low bit(s) for tagging,
> you have to make sure the objects you are pointing to are sufficiently
> aligned. BTW, how does LLVM tag pointers to chars?

I don't know. I'm not an expert on the LLVM codebase even though I made some
contributions. If you know how to address this issue I'm curious to hear about
the fix.

Adrian

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