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Cache blocking vnl bra

Nicolas Tancogne-Dejean requested to merge cache_blocking_vnl_bra into develop

Description

Optimization: Cache blocking for the routine vnl_mat_bra. On a test calculation this lead to a boost of ~35%. This is confirmed by a significamt reduction of caches misses using cachegrind.

News snippet

Optimization of the application of the pseudopotential in some cases.

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.

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