Bug 89387 - improve performance for some matrix operations

Eike Rathke erack at redhat.com
Wed Dec 14 12:04:19 UTC 2016


Hi Filippo,

On Wednesday, 2016-12-14 09:59:28 +0000, Filippo giacchè wrote:

> -why there is no need to modify that function?

Because it is called only in one place and that place in turn is called
very rarely. There's almost no gain over all if only MatCopy() alone was
optimized, despite that it proabbly can't, unless the underlying matrix
structures/algorithms are touched from which all matrix functions could
benefit, which would involve getting acquainted with
mdds::multi_type_matrix that is about the hardest stuff you can get
into.

> there are many function with "fixme" near them (in
> core/sc/source/core/tool/scmatrix.cxx), are they not to be
> modified/optimized?

Check with git annotate who introduced that when (and maybe why).

> - what is the main goal of this task (tdf#bug 89387) ?

Łukasz in https://bugs.documentfoundation.org/show_bug.cgi?id=89387#c37
already gave hints where to look at.

Actually I don't get why that task is marked as an EasyHack with
difficultyBeginner, it should be at least difficultyInteresting..

  Eike


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