Egor Smirnov 5f151c5cf3 Performance optimizations for Intel CPUs (#3957)
* Initial performance optimizations for xgboost

* remove includes

* revert float->double

* fix for CI

* fix for CI

* fix for CI

* fix for CI

* fix for CI

* fix for CI

* fix for CI

* fix for CI

* fix for CI

* fix for CI

* Check existence of _mm_prefetch and __builtin_prefetch

* Fix lint
2019-01-08 21:08:13 -08:00
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