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Upgrade half library to 2.2 #755

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Upgrade half library to 2.2 #755

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13 changes: 9 additions & 4 deletions cpp/external/half-2.1.0/ChangeLog.txt → cpp/external/half-2.2.0/ChangeLog.txt
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NOTE: This version locally modified for KataGo to fix some g++ compiler warnings
about default switch cases.

Release Notes
Release Notes {#changelog}
=============

2.2.0 release (2021-06-12):
---------------------------

- Added `rsqrt` function for inverse square root.
- Improved performance of `pow` function.
- Fixed bug that forgot to include `<immintrin.h>` for F16C intrinsics.


2.1.0 release (2019-08-05):
---------------------------

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2 changes: 1 addition & 1 deletion cpp/external/half-2.1.0/LICENSE.txt → cpp/external/half-2.2.0/LICENSE.txt
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The MIT License

Copyright (c) 2012-2019 Christian Rau
Copyright (c) 2012-2021 Christian Rau

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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2 changes: 1 addition & 1 deletion cpp/external/half-2.1.0/README.txt → cpp/external/half-2.2.0/README.txt
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HALF-PRECISION FLOATING-POINT LIBRARY (Version 2.1.0)
HALF-PRECISION FLOATING-POINT LIBRARY (Version 2.2.0)
-----------------------------------------------------

This is a C++ header-only library to provide an IEEE 754 conformant 16-bit
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