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Add support for Armv8.2-a __fp16

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Armv8.2-a provides a native half-precision floating point (__fp16 aka.
float16_t). This patch introduces

* __fp16 as underlying type of Eigen::half if this type is available
* the packet types Packet4hf and Packet8hf representing float16x4_t and
  float16x8_t respectively
* packet-math for the above packets with corresponding scalar type Eigen::half

The packet-math functionality has been implemented by Ashutosh Sharma
<ashutosh.sharma@amperecomputing.com>.

This closes #1940.
This commit is contained in:
David Tellenbach
2020-10-28 20:15:09 +00:00
parent a725a3233c
commit e265f7ed8e
9 changed files with 869 additions and 30 deletions
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test/packetmath.cpp
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@@ -246,6 +246,7 @@ void packetmath_boolean_mask_ops() {
data1[i] = Scalar(i);
data1[i + PacketSize] = internal::random<bool>() ? data1[i] : Scalar(0);
}
CHECK_CWISE2_IF(true, internal::pcmp_eq, internal::pcmp_eq);
//Test (-0) == (0) for signed operations