Cherry-pick commit #3416 from Faiss baseline

[alexanderguzhva]

facebookresearch/faiss#3416

The code generated for function fvec_L2sqr generated by OpenXL do not perform as good as the codes generated by gcc on Power. The macros to enable imprecise floating point operation don’t cover Power with OpenXL. This patch adds the OpenXL compiler options for the PowerPC macros to achieve better performance.

[mergify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.04%. Comparing base (3c46f4c) to head (a28f0d3).
Report is 44 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #562       +/-   ##
=========================================
+ Coverage      0   70.04%   +70.04%     
=========================================
  Files         0       67       +67     
  Lines         0     4597     +4597     
=========================================
+ Hits          0     3220     +3220     
- Misses        0     1377     +1377     

see 67 files with indirect coverage changes

[alexanderguzhva]

rerun ut

[alexanderguzhva]

/rerun-e2e

[alexanderguzhva]

/run-e2e

[chasingegg]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexanderguzhva, chasingegg

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[chasingegg]

/kind improvement