[ET Trac] [Einstein Toolkit] #2219: fix sqrt() for AVX512, updates to Vectors thorn

[Einstein Toolkit]

#2219: fix sqrt() for AVX512, updates to Vectors thorn
-----------------------------------+---------------------------------
 Reporter:  Roland Haas            |      Owner:  Roland Haas
     Type:  defect                 |     Status:  assigned
 Priority:  critical               |  Milestone:  ET_2019_02
Component:  EinsteinToolkit thorn  |    Version:  development version
 Keywords:  Vectors                |
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 This pull request mostly add better support for the AVX512 instructions
 found in KNL and modern Intel Xeon / Core iN CPUs.

 There is one bugfix commit “Correct error in AVX512 sqrt implemention”
 which is important for those architectures (eg to compute sqrt(detg)).

 I am marking this as critical until I can verify that without this fix the
 result of a BBH simulation on eg Stampede2 is not incorrect because of
 using an incorrect sqrt() function.

 Pull request is here: https://bitbucket.org/cactuscode/cactusutils/pull-
 requests/17/rhaas-avx512/diff

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/2219>
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