Re: [Qemu-devel] [PATCH v9 2/7] target/ppc: replace __builtin_ffssl() by the equivalent ctz routines

[David Gibson]

On Tue, Dec 18, 2018 at 09:07:47AM +0100, Cédric Le Goater wrote:
> On 12/18/18 3:23 AM, David Gibson wrote:
> > On Mon, Dec 17, 2018 at 11:34:40PM +0100, Cédric Le Goater wrote:
> >> And remove the intermediate MASK_TO_LSH macro which does not add any value.
> >>
> >> This fixes a compile breakage on windows.
> >>
> >> Signed-off-by: Cédric Le Goater <address@hidden>
> > 
> > It's an improvement over what's there, but it still leaves macros
> > whose primary use would be for guest registers, but are typed
> > according to host values, which doesn't make much sense.
> > 
> > I think instead we should redefine your BE64 / BE32 variants in terms
> > of the existing extract*() and deposit*() primitives, and get rid of
> > the GETFIELD / SETFIELD macros.
> 
> I will get rid of the GETFIELD/SETFIELD macros and rewrite the BE64/BE32 
> variants but I won't use the extract*() and deposit*(). I prefer to keep
> the same pattern, which is similar to shpc_get/set_status(). I will make 
> the code clearer with static inlines.

That's fine.

> I don't really like the names also. what about
> xive_(get/set)_field(32/64) ?

Sure, works for me.  Since these will now be strictly fixed width, you
can probably make them inlines instead of macros too, so we get type
checking.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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