Re: [PATCH] Introduce a boolean "single_bit_set" function.

[H. Peter Anvin]

Petr Tesarik wrote:
> 
> Ok, then my only concern is that the hweight* functions return the exact
> weight, which might be much less efficient if all we need is to know
> whether it's 1.
> 
> Theoretically, gcc should be able to optimize things out, but I'm not
> all that optimistic about how well it does it.
> 

I can almost guarantee it won't in this case.

	-hpa
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