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RICH Photon Reco - More efficient mirror data cache update implementation.

Christopher Rob Jones requested to merge RichPhotonReco-MirrorUpdateOptimise into master

Implements improvements to the method SIMDQuarticPhotonReco::MirrorData::update() which caches SIMD information when associated mirror pointers change. Main changes are :

  • Avoid pointer dereferences, which are potentially slow due to cache issues, when they are not strictly required (i.e. pointer has not changed).
  • Use private minimal implementations of Point, Vector and Plane that allow direct access to data members, that in turn allows MirrorData::update() to be a lot more efficient.

Relies on LHCb!1108 (merged)

Edited by Christopher Rob Jones

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