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Special function implementations for half/bfloat16 packets.

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Current implementations fail to consider half-float packets, only
half-float scalars.  Added specializations for packets on AVX, AVX512 and
NEON.  Added tests to `special_packetmath`.

The current `special_functions` tests would fail for half and bfloat16 due to
lack of precision. The NEON tests also fail with precision issues and
due to different handling of `sqrt(inf)`, so special functions bessel, ndtri
have been disabled.

Tested with AVX, AVX512.
This commit is contained in:
Antonio Sanchez
2020-12-02 14:00:57 -08:00
parent 305b8bd277
commit e2f21465fe
17 changed files with 418 additions and 159 deletions
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2
Eigen/src/Core/arch/Default/Half.h
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@@ -58,7 +58,7 @@
#define F16_PACKET_FUNCTION(PACKET_F, PACKET_F16, METHOD) \
template <> \
EIGEN_DEFINE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS EIGEN_UNUSED \
EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC EIGEN_UNUSED \
PACKET_F16 METHOD<PACKET_F16>(const PACKET_F16& _x) { \
return float2half(METHOD<PACKET_F>(half2float(_x))); \
}