Subject: Re: bug#53895: [PATCH 0/5] More CPU detection

From: Efraim Flashner <[email-masked]>
Date: Wed, 9 Feb 2022 13:41:40 +0200

On Wed, Feb 09, 2022 at 11:43:21AM +0100, Ludovic Courtès wrote:
> Efraim Flashner <[email-masked]> skribis:
> 
> > +              (letrec-syntax ((if-flags (syntax-rules (=>)
> > +                                          ((_)
> > +                                           #f)
> > +                                          ((_ (flags ... => name) rest ...)
> > +                                           (if (every (lambda (flag)
> > +                                                        (set-contains? (cpu-flags cpu)
> > +                                                                       flag))
> > +                                                      '(flags ...))
> > +                                             name
> > +                                             (if-flags rest ...))))))
> > +
> > +                (when (= 22 (cpu-family cpu))
> > +                  (if-flags ("movbe" => "btver2")))
> > +                (when (= 6 (cpu-family cpu))
> > +                  (if-flags ("3dnowp" => "athalon")))
> 
> This has no effect (because ‘if-flags’ returns a value that is ignored
> since it’s not returned.)
> 
> What we could do is extend ‘if-flags’ so that it can optionally check
> for a family number:
> 
>   (if-flags ((family 22) "movbe" => "btver2")
>              …)

Another option would be to just move it to the bottom of the if-flags so
it should take effect then.

-- 
Efraim Flashner   <[email-masked]>   רנשלפ םירפא
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