Re: [X86] Fwd: F29 System Wide Change: i686 Is For x86-64

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On 06/04/2018 05:07 PM, Adam Jackson wrote:
On Mon, 2018-06-04 at 16:04 +0200, Florian Weimer wrote:

This proposal suggests to accept this reality and build the i686
packages in such a way that they require the ISA level of (early)
x86-64 CPUs.

On which x86 CPU families will Fedora continue to work?

Based on this proposed change, you will need an x86-64-capable CPU.

That's not how I read the proposal. No reason a P4 shouldn't work if
all you're requiring is SSE2+FXSR, right?

It will probably work, but it's more of a happy accident than a deliberate decision. I would still suggest it if it were incompatible with Pentium 4 CPUs without x86-64 support. (The fewer of these Netburst power guzzlers are running, the better, to be honest.)

Certainly, I don't see us jumping to long mode, doing the computation there, and jumping back, so it's hard to imagine that anything more than SSE2 (you need fxsr for SSE2 for the context switch AFAICS anyway) will be required by the i686 user space in the future.

Thanks,
Florian
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