From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: Victor Chernyakin <chernyakin.victor.j@outlook.com>
Cc: "Jonathan Cameron" <jic23@kernel.org>,
"David Lechner" <dlechner@baylibre.com>,
"Nuno Sá" <nuno.sa@analog.com>,
"Andy Shevchenko" <andy@kernel.org>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/4] iio: prepare iio_format_value to handle higher-precision IIO_VAL_DECIMAL64_* formats
Date: Mon, 26 Oct 2026 22:17:12 +0200 [thread overview]
Message-ID: <at-1SGe6xnObPqPG@ashevche-desk.local> (raw)
In-Reply-To: <SN1PR12MB2528906BE220765FAF201080A5612@SN1PR12MB2528.namprd12.prod.outlook.com>
On Mon, Oct 26, 2026 at 11:51:11AM -0500, Victor Chernyakin wrote:
> Prepare iio_format_value for an upcoming patch that adds formats up
> to IIO_VAL_DECIMAL64_YOCTO (a scale of 24 digits) by avoiding
> computing 10^scale when doing so would overflow, and by avoiding
> undefined behavior due to abs(LLONG_MIN) (which couldn't happen
> previously).
...
> +#define GREATEST_POWER_OF_10_THAT_FITS_IN_S64 18
It's an interesting name for log10(2^63).
This, along with log10(2^64 - 1) should be added as definitions at least
IIO-wide. There is a series that wanted similar for u64.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2026-10-26 20:17 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-26 16:51 [PATCH v3 0/4] iio: cdc: add Texas Instruments FDC1004 driver Victor Chernyakin
2026-10-26 16:51 ` [PATCH v3 1/4] iio: prepare iio_format_value to handle higher-precision IIO_VAL_DECIMAL64_* formats Victor Chernyakin
2026-10-26 20:17 ` Andy Shevchenko [this message]
2026-10-27 1:51 ` Victor Chernyakin
2026-10-27 7:29 ` Andy Shevchenko
2026-10-27 8:36 ` Victor Chernyakin
2026-10-27 18:56 ` Rodrigo Alencar
2026-10-28 8:11 ` Andy Shevchenko
2026-10-28 10:31 ` David Laight
2026-10-28 11:16 ` David Laight
2026-10-26 16:51 ` [PATCH v3 2/4] iio: add IIO_VAL_DECIMAL64_{ATTO,ZEPTO,YOCTO} formats Victor Chernyakin
2026-10-26 16:51 ` [PATCH v3 3/4] dt-bindings: iio: cdc: add Texas Instruments FDC1004 Victor Chernyakin
2026-10-26 16:51 ` [PATCH v3 4/4] iio: cdc: add Texas Instruments FDC1004 driver Victor Chernyakin
2026-10-26 20:13 ` Andy Shevchenko
2026-10-27 2:13 ` Victor Chernyakin
2026-10-27 7:33 ` Andy Shevchenko
2026-10-27 10:04 ` Victor Chernyakin
2026-10-27 8:17 ` Joshua Crofts
2026-10-27 10:06 ` Victor Chernyakin
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