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▲Floating Point Fun on Cortex-M Processors (danielmangum.com)

53 points by hasheddan 2 days ago | 5 comments

Neywiny 14 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 7 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?

russdill 6 hours ago [-]

There is overhead, and applications that don't use the FPU avoid that overhead. https://www.netbsd.org/docs/kernel/lazyfpu.html

bobmcnamara 8 hours ago [-]

Yes, you could turn it off every context switch.

summa_tech 9 hours ago [-]

Zephyr support lazy FPU context switches. So the downside from enabling FPU sharing is fairly limited.

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