On 2023-05-17 15:39, Florian Weimer wrote:
* Frank Scheiner:On 12.05.23 17:57, Ard Biesheuvel wrote:The bottom line is that, while I know of at least 2 people (on cc)that test stuff on itanium, and package software for it, I don't think there are any actual users remaining, and so it is doubtful whether itis justified to ask people to spend time and effort on this.While I get your argument, I also find it important to be able to innovate without destroying the past. And with the already severly limited choice of current architectures for the masses (x86, arm), itbecomes even more important to keep what we have or had in the past, tonot end in a "If all you have is a hammer, everything looks like a nail." type of future.The history doesn't go away. We still have pre-built ia64 system images, the sources, and current machines can run ia64 code under QEMU. Those host systems will remain available (maybe under virtualization) for many, many years to come. So if anyone wants to experiment with an architecture that has register trap bits and things like that, it's possible. I expect the rest of the hardware itself is not remarkable, and anything useful has been thoroughly reused for other systems (like we did for the Itanium C++ ABI on the software side). From the userspace side, the issue is not so much testing (if we bother to test our changes at all, we can use emulation), but half-completed implementaton work (I ran into missing relaxations in the link editor a while back, for example), and those limitations have knock-on effects on generic code that we have to maintain.
FYI, QEMU does not have ia64 host or target support, not even TCG.
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