Rich Pixel Cluster Optimisations

Various improvements to the RichPixelCluster class.

• Specific optimisation for size 1 clusters, which are the most common use case. heap allocations are now completely avoided in this case.
• Various speed improvements to the builder classes, again mostly based around avoiding heap allocations as far as possible.

mentioned in merge request Lbcom!249 (merged)

added 15 commits

• c43b22c1...4d6a9bf2 - 11 commits from branch lhcb:master
• aef4c1df - Merge branch 'master' of ssh://gitlab.cern.ch:7999/lhcb/LHCb into RichPixelCluster-OptimiseSizeOne
• 27372b79 - Merge branch 'master' of ssh://gitlab.cern.ch:7999/lhcb/LHCb into RichPixelCluster-OptimiseSizeOne
• b65e3aea - Use SIMD Zero for initialisation
• 22f3221a - remove some definitions

Compare with previous version

unmarked as a Work In Progress

changed title from WIP : Rich Pixel Cluster Optimisations to Rich Pixel Cluster Optimisations

changed the description

• [2018-05-30 00:12] Validation started with lhcb-lcg-dev3#540
• [2018-05-30 00:13] Validation started with lhcb-clang-test#968
• [2018-05-30 00:14] Validation started with lhcb-head#1869
• [2018-05-30 00:14] Validation started with lhcb-lcg-dev4#540
• [2018-05-30 00:14] Validation started with lhcb-gaudi-head-py3#169
• [2018-05-30 00:14] Validation started with lhcb-tdr-test#166
• [2018-05-30 00:15] Validation started with lhcb-gaudi-head#1882
• [2018-05-30 01:40] Validation started with lhcb-lcg-dev4#540
• [2018-05-30 02:48] Validation started with lhcb-tdr-test#166

merged

mentioned in commit dfaf0448

mentioned in merge request Brunel!422 (merged)

mentioned in commit Brunel@7deed369