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Add reciprocal packet op and fast specializations for float with SSE, AVX, and AVX512.

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This commit is contained in:
Rasmus Munk Larsen
2022-01-21 23:49:18 +00:00
parent 4b0926f99b
commit ea2c02060c
14 changed files with 95 additions and 63 deletions
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21
Eigen/src/Core/GenericPacketMath.h
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@@ -65,6 +65,7 @@ struct default_packet_traits
HasCmp = 0,
HasDiv = 0,
HasReciprocal = 0,
HasSqrt = 0,
HasRsqrt = 0,
HasExp = 0,
@@ -816,13 +817,6 @@ Packet plog2(const Packet& a) {
template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS
Packet psqrt(const Packet& a) { return numext::sqrt(a); }
/** \internal \returns the reciprocal square-root of \a a (coeff-wise) */
template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS
Packet prsqrt(const Packet& a) {
typedef typename internal::unpacket_traits<Packet>::type Scalar;
return pdiv(pset1<Packet>(Scalar(1)), psqrt(a));
}
/** \internal \returns the rounded value of \a a (coeff-wise) */
template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS
Packet pround(const Packet& a) { using numext::round; return round(a); }
@@ -1035,6 +1029,19 @@ pblend(const Selector<unpacket_traits<Packet>::size>& ifPacket, const Packet& th
return ifPacket.select[0] ? thenPacket : elsePacket;
}
/** \internal \returns 1 / a (coeff-wise) */
template <typename Packet>
EIGEN_DEVICE_FUNC inline Packet preciprocal(const Packet& a) {
using Scalar = typename unpacket_traits<Packet>::type;
return pdiv(pset1<Packet>(Scalar(1)), a);
}
/** \internal \returns the reciprocal square-root of \a a (coeff-wise) */
template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS
Packet prsqrt(const Packet& a) {
return preciprocal<Packet>(psqrt(a));
}
} // end namespace internal
} // end namespace Eigen