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support popcnt on armv8
authorNiklas Fiekas <niklas.fiekas@backscattering.de>
Thu, 25 Jun 2020 10:42:25 +0000 (12:42 +0200)
committerJoost VandeVondele <Joost.VandeVondele@gmail.com>
Sat, 27 Jun 2020 08:19:29 +0000 (10:19 +0200)
* Supports popcnt (thanks @daylen)
* bits = 64 is now the default

Tested with g++ (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04) 7.5.0 on ThunderX CN8890,
yields about 9% speedup.

Also tested with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final).

closes https://github.com/official-stockfish/Stockfish/pull/2770

No functional change.


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