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Neywiny 20 hours ago [-]
Interesting. I was just thinking about this because of another post on floating point. I'm wondering if I can disable the fpu every so often and turn it on only if code needs it and it raises an exception.
glitchc 14 hours ago [-]
It's unclear why one would ever need to do this. Is it for power savings? What other use-cases would benefit from turning the FPU off between instructions?
Yes, for power savings. But I'd need to do a bit of a study on my code to see if it's even worth it. Since the majority of it doesn't use the FPU, it could help. But it might not be worth the effort.
bobmcnamara 15 hours ago [-]
Yes, you could turn it off every context switch.
summa_tech 15 hours ago [-]
Zephyr support lazy FPU context switches. So the downside from enabling FPU sharing is fairly limited.