D12897: Reserve space for the cachedLineForRanges Qhash (optimization)

[Jaime Torres Amate]

jtamate created this revision.
jtamate added reviewers: Kate, Frameworks.
Restricted Application added projects: Kate, Frameworks.
Restricted Application added subscribers: kde-frameworks-devel, kwrite-devel.
jtamate requested review of this revision.

REVISION SUMMARY
  Most of the time was spent allocating space for the hashdata.
  The perf numbers speak by themself: 
  from 42.3% (cycles inc.) F5849664: kwrite_reserver_perf_dwarf_before.png <https://phabricator.kde.org/F5849664>
  to 16.1% (cycles inc.) F5849665: kwrite_reserver_perf_dwarf_after.png <https://phabricator.kde.org/F5849665>

TEST PLAN
  repeat {
  
    Paste, go to beginning of file
  
  } 5 times
  Undo 5 times

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D12897

AFFECTED FILES
  src/buffer/katetextblock.cpp

To: jtamate, #kate, #frameworks
Cc: kwrite-devel, kde-frameworks-devel, michaelh, kevinapavew, ngraham, bruns, demsking, cullmann, sars, dhaumann
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