Re: [PATCH 1/3] X86: Optimise fls(), ffs() and fls64()

[Avi Kivity]

On 04/14/2010 02:49 PM, David Howells wrote:
> Matthew Wilcox<matthew@xxxxxx>  wrote:
>
>    
> > I don't know whether we can get it /documented/, but the architect I
> > asked said "We'll never get away with reverting to the older behavior,
> > so in essence the architecture is set to not overwrite."
> >      
> Does that mean we can rely on it?  Linus?
>    

Even if Intel processors behave that way, other processors (real and 
emulated) use those manuals as a specification.  Emulated processors are 
unlikely to touch an undefined register, but real processors may.

(qemu tcg appears not to touch the output)

--
error compiling committee.c: too many arguments to function

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