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What are hints?

Juha Aaltonen over 10 years ago

What does it mean that an instruction is a hint instruction, like NOP, YIELD and WFE?

I haven't found any explanations in ARM Architecture Reference Manual, ARMv7-A and ARMv7-R edition, Issue C.

[EDIT]

Aha, this has already been answered in:

Are processors really only "taking a hint" for WFE,WFI,SEV?

It would have been nice to know what instructions like NOP and YIELD affect the HW, or are the hint instructions more like partially/fully implementation dependent?

[/EDIT]

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Yasuhiko Koumoto over 10 years ago +1 verified

Hello, the behavior (or side effect) of NOP or YIELD is implementation dependent. As far as I know, NOP or YIELD would affect nothing to the hardware. A silicon vendor which has the architecture license...

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0 Juha Aaltonen over 10 years ago in reply to Yasuhiko Koumoto

Thanks. I suspected something like that.
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0 Juha Aaltonen over 10 years ago in reply to Yasuhiko Koumoto

Thanks. I suspected something like that.
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