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Message-ID: <20240224170225.4720f9a2@jic23-huawei>
Date: Sat, 24 Feb 2024 17:02:25 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Andy Shevchenko <andy@...nel.org>
Cc: Ceclan Dumitru <mitrutzceclan@...il.com>, linus.walleij@...aro.org,
brgl@...ev.pl, linux-gpio@...r.kernel.org, Lars-Peter Clausen
<lars@...afoo.de>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
Michael Walle <michael@...le.cc>, Arnd Bergmann <arnd@...db.de>, ChiaEn Wu
<chiaen_wu@...htek.com>, Niklas Schnelle <schnelle@...ux.ibm.com>, Leonard
Göhrs <l.goehrs@...gutronix.de>, Mike Looijmans
<mike.looijmans@...ic.nl>, Haibo Chen <haibo.chen@....com>, Hugo Villeneuve
<hvilleneuve@...onoff.com>, David Lechner <dlechner@...libre.com>, Ceclan
Dumitru <dumitru.ceclan@...log.com>, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v13 2/3] iio: adc: ad_sigma_delta: Add optional irq
selection
On Tue, 20 Feb 2024 16:17:52 +0200
Andy Shevchenko <andy@...nel.org> wrote:
> On Tue, Feb 20, 2024 at 04:13:12PM +0200, Ceclan Dumitru wrote:
> > On 2/20/24 16:11, Andy Shevchenko wrote:
> > > On Tue, Feb 20, 2024 at 11:43:39AM +0200, Dumitru Ceclan wrote:
>
> ...
>
> > >> + if (!info->irq_num)
> > >> + sigma_delta->irq_num = spi->irq;
> > >> + else
> > >> + sigma_delta->irq_num = info->irq_num;
> > >
> > > Why not positive check?
> > >
> > Considered that selecting spi->irq is usually the default case, so it should
> > be the first branch
>
> Let compiler do its job, the negative conditions are harder to read/parse by
> human beings.
>
FWIW compiler almost certainly won't figure this out as it has nothing to go on
- history based branch prediction in processors will though! We don't want to
be hinting direction to the compiler for a case like this as that will make
it very painful if we get it wrong. Anyhow Andy's comment is valid even if
I disagree with the reason.
Jonathan
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