[Libreoffice-bugs] [Bug 142307] Upgrade SSE2 sum to AVX512 sum with Neumaier (precise fp-sum)

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=142307

--- Comment #8 from dante19031999 at gmail.com ---
> Yeah, I just want to know info like:
> 
> "I have a spreadsheet with 1 million cells with data and 100 formulas
> 
> It took 1 min for recalculating before
> It take 10 sec for recalculating after"

That depends of the computer, for mine (3*10^6 terms):
Time for sum with NONE: 0.002667 s (default on ARM)
Time for sum with AVX: 0.001426 s (new)
Time for sum with SSE2: 0.001914 s (original)
And I can't tell you about AVX512.

But can't give you much more info. This kind of thing will work on auto
generated calc sheets with insane amounts of data.

So expect an improvement of ~ * 1.4 on the sum plus the time spended on the
interpreter.

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