On 20 December 2017 at 15:39, David Laight <David.Laight@xxxxxxxxxx> wrote: > From: Crt Mori >> Sent: 20 December 2017 14:20 >> >> There is no option to perform 64bit integer sqrt on 32bit platform. >> Added stronger typed int_sqrt64 enables the 64bit calculations to >> be performed on 32bit platforms. Although int_sqrt() is a rough >> approximation, the same algorithm is used in int_sqrt64() as good >> enough on 32bit platform. > > The algorithm used gives an exact (rounded down) square root, > not an approximation. > OK, noted. This is from new changed function indeed - will change in v11. > With minor changes it ought to be possible to remove most of the > 64bit arithmetic and shifts. > > If you care about performance then using 32 bit maths will be much faster. > I need precision not the performance. That is why I would like to leave int_sqrt as one for good performance while my will be used when you require a precision. > David > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
