On Thu, 24 Jun 2021 21:13:43 +0100, Cassio Neri wrote:

The current implementation of rtc_time64_to_tm() contains unnecessary
loops, branches and look-up tables. The new one uses an arithmetic-based
algorithm appeared in [1] and is approximately 4.3 times faster (YMMV).

The drawback is that the new code isn't intuitive and contains many 'magic
numbers' (not unusual for this type of algorithm). However, [1] justifies
all those numbers and, given this function's history, the code is unlikely
to need much maintenance, if any at all.

[...]

Applied, thanks!

[1/1] rtc: Improve performance of rtc_time64_to_tm(). Add tests.
      commit: 1d1bb12a8b1805ddeef9793ebeb920179fb0fa38

Best regards,
-- 
Alexandre Belloni [off-list ref]