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Neon power management / VFP power management

Note: This was originally posted on 24th December 2012 at http://forums.arm.com

hi, experts:

Does NEON unit have power management feature? (Similar to ARM core's DVFS function)

If NEON has power saving features, How about VFP unit?

If NEON has power saving features, so which doc will describe it?

Will NEON and VFP share some hardware funtions?(except for registers)

best wishes,

china liu over 12 years ago

Note: This was originally posted on 28th December 2012 at http://forums.arm.com

hi, ttfn:
how about VFP unit?
Processor has the ability to separately power on/off the VFP logic?

best wishes,
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china liu over 12 years ago

Note: This was originally posted on 31st December 2012 at http://forums.arm.com

hi, ttfn:
Thanks for your explanation!
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Martin Weidmann over 12 years ago

Note: This was originally posted on 27th December 2012 at http://forums.arm.com

Are you asking about what an implementation _could_ do, or what a particular processor _does_ do?

Most of the processors I have worked with have the ability to separately power on/off the NEON logic to the rest of the core. I don't know of one that allows the NEON unit have its clocked varied independently of the main processor, doesn't mean it doesn't exist though.
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Martin Weidmann over 12 years ago

Note: This was originally posted on 28th December 2012 at http://forums.arm.com

Again I can only speak for the processors I've worked with.... But my experience is that the NEON and VFP logic are in the same power domain. So NEON+VFP is powered, or NEON+VFP is not powered.
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