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Draft: Initial Intel HEXL patch

Fabian Boemer requested to merge fboemer/hexl into master

Initial integration with Intel HEXL https://github.com/intel/hexl

Testing on ICX with gcc-9.3:

./bin/benchmark/lib-benchmark --benchmark_min_time=3 --benchmark_filter=Transform

Before:

NTTTransform1024               14.4 us         14.4 us        96885
INTTTransform1024              14.5 us         14.5 us        96723
NTTTransform4096               67.3 us         67.2 us        20820
INTTTransform4096              67.1 us         67.1 us        20870
NTTTransformInPlace1024        13.5 us         13.5 us       103706
INTTTransformInPlace1024       14.3 us         14.2 us        98286
NTTTransformInPlace4096        63.8 us         63.7 us        21970
INTTTransformInPlace4096       66.3 us         66.2 us        21144

After:

NTTTransform1024               1.31 us         1.30 us      3193677
INTTTransform1024              1.48 us         1.47 us      2852312
NTTTransform4096               6.19 us         6.17 us       680824
INTTTransform4096              6.81 us         6.78 us       619025
NTTTransformInPlace1024        1.25 us         1.24 us      3378466
INTTTransformInPlace1024       1.30 us         1.30 us      3240882
NTTTransformInPlace4096        5.84 us         5.84 us       719683
INTTTransformInPlace4096       6.30 us         6.29 us       667509
Edited by Fabian Boemer

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