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author | 2016-02-19 08:19:12 +0000 | |
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committer | 2016-02-19 08:19:12 +0000 | |
commit | ac5d706a942faa275ea467009d2004a7aeb3e3fa (patch) | |
tree | 4bcc82d675610bb89027d3de6b91fa8c7e850b11 /Eigen/src | |
parent | 0606a0a39bcf01b0a03f0dcd17f7075fce8c402c (diff) |
Added support for simple coefficient wise tensor expression using half floats on CUDA devices
Diffstat (limited to 'Eigen/src')
-rw-r--r-- | Eigen/src/Core/arch/CUDA/PacketMathHalf.h | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/Eigen/src/Core/arch/CUDA/PacketMathHalf.h b/Eigen/src/Core/arch/CUDA/PacketMathHalf.h new file mode 100644 index 000000000..7f99376fb --- /dev/null +++ b/Eigen/src/Core/arch/CUDA/PacketMathHalf.h @@ -0,0 +1,220 @@ +// This file is part of Eigen, a lightweight C++ template library +// for linear algebra. +// +// Copyright (C) 2016 Benoit Steiner <benoit.steiner.goog@gmail.com> +// +// This Source Code Form is subject to the terms of the Mozilla +// Public License v. 2.0. If a copy of the MPL was not distributed +// with this file, You can obtain one at http://mozilla.org/MPL/2.0/. + +#ifndef EIGEN_PACKET_MATH_HALF_CUDA_H +#define EIGEN_PACKET_MATH_HALF_CUDA_H + +namespace Eigen { + +namespace internal { + +#if defined(EIGEN_HAS_CUDA_FP16) + +// Make sure this is only available when targeting a GPU: we don't want to +// introduce conflicts between these packet_traits definitions and the ones +// we'll use on the host side (SSE, AVX, ...) +#if defined(__CUDACC__) && defined(EIGEN_USE_GPU) + +#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ >= 530 + +__device__ half operator + (const half& a, const half& b) { + return __hadd(a, b); +} +__device__ half operator * (const half& a, const half& b) { + return __hmul(a, b); +} +__device__ half operator - (const half& a, const half& b) { + return __hsub(a, b); +} +__device__ half operator / (const half& a, const half& b) { + assert(false && "tbd"); + return half(); +} +__device__ half operator - (const half& a) { + return __hneg(a); +} + + +template<> struct is_arithmetic<half2> { enum { value = true }; }; + +template<> struct packet_traits<half> : default_packet_traits +{ + typedef half2 type; + typedef half2 half; + enum { + Vectorizable = 1, + AlignedOnScalar = 1, + size=2, + HasHalfPacket = 0, + + HasDiv = 1, + HasLog = 1, + HasExp = 1, + HasSqrt = 1, + HasRsqrt = 1, + HasLGamma = 1, + HasDiGamma = 1, + HasErf = 1, + HasErfc = 1, + + HasBlend = 0, + }; +}; + + +template<> struct unpacket_traits<half2> { typedef half type; enum {size=2, alignment=Aligned16}; typedef half2 half; }; + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 pset1<half2>(const half& from) { + return __half2half2(from); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 plset<half2>(const half& a) { + return __halves2half2(a, __hadd(a, __float2half(1))); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 padd<half2>(const half2& a, const half2& b) { + return __hadd2(a, b); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 psub<half2>(const half2& a, const half2& b) { + return __hsub2(a, b); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 pnegate(const half2& a) { + return __hneg2(a); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 pconj(const half2& a) { return a; } + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 pmul<half2>(const half2& a, const half2& b) { + return __hmul2(a, b); +} + + template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 pmadd<half2>(const half2& a, const half2& b, const half2& c) { + return __hfma2(a, b, c); + } + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 pdiv<half2>(const half2& a, const half2& b) { + float a1 = __low2float(a); + float a2 = __high2float(a); + float b1 = __low2float(b); + float b2 = __high2float(b); + float r1 = a1 / b1; + float r2 = a2 / b2; + return __floats2half2_rn(r1, r2); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 pmin<half2>(const half2& a, const half2& b) { + float a1 = __low2float(a); + float a2 = __high2float(a); + float b1 = __low2float(b); + float b2 = __high2float(b); + half r1 = a1 < b1 ? __low2half(a) : __low2half(b); + half r2 = a2 < b2 ? __high2half(a) : __high2half(b); + return __halves2half2(r1, r2); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 pmax<half2>(const half2& a, const half2& b) { + float a1 = __low2float(a); + float a2 = __high2float(a); + float b1 = __low2float(b); + float b2 = __high2float(b); + half r1 = a1 > b1 ? __low2half(a) : __low2half(b); + half r2 = a2 > b2 ? __high2half(a) : __high2half(b); + return __halves2half2(r1, r2); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 pload<half2>(const half* from) { + return *reinterpret_cast<const half2*>(from); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE half2 ploadu<half2>(const half* from) { + return __halves2half2(from[0], from[1]); +} + +template<> EIGEN_STRONG_INLINE half2 ploaddup<half2>(const half* from) { + return __halves2half2(from[0], from[0]); +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void pstore<half>(half* to, const half2& from) { + *reinterpret_cast<half2*>(to) = from; +} + +template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void pstoreu<half>(half* to, const half2& from) { + to[0] = __low2half(from); + to[1] = __high2half(from); +} + +template<> +EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE half2 ploadt_ro<half2, Aligned>(const half* from) { + return __ldg((const half2*)from); +} + +template<> +EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE half2 ploadt_ro<half2, Unaligned>(const half* from) { + return __halves2half2(__ldg(from+0), __ldg(from+1)); +} + +template<> EIGEN_DEVICE_FUNC inline half2 pgather<half, half2>(const half* from, Index stride) { + return __halves2half2(from[0*stride], from[1*stride]); +} + +template<> EIGEN_DEVICE_FUNC inline void pscatter<half, half2>(half* to, const half2& from, Index stride) { + to[stride*0] = __low2half(from); + to[stride*1] = __high2half(from); +} + +template<> EIGEN_DEVICE_FUNC inline half pfirst<half2>(const half2& a) { + return __low2half(a); +} + +template<> EIGEN_DEVICE_FUNC inline half predux<half2>(const half2& a) { + return __hadd(__low2half(a), __high2half(a)); +} + +template<> EIGEN_DEVICE_FUNC inline half predux_max<half2>(const half2& a) { + half first = __low2half(a); + half second = __high2half(a); + return __hgt(first, second) ? first : second; +} + +template<> EIGEN_DEVICE_FUNC inline half predux_min<half2>(const half2& a) { + half first = __low2half(a); + half second = __high2half(a); + return __hlt(first, second) ? first : second; +} + +template<> EIGEN_DEVICE_FUNC inline half predux_mul<half2>(const half2& a) { + return __hmul(__low2half(a), __high2half(a)); +} + +template<> EIGEN_DEVICE_FUNC inline half2 pabs<half2>(const half2& a) { + assert(false && "tbd"); + return half2(); +} + + +EIGEN_DEVICE_FUNC inline void +ptranspose(PacketBlock<half2,2>& kernel) { + assert(false && "tbd"); + // half tmp = kernel.packet[0].y; + // kernel.packet[0].y = kernel.packet[1].x; + // kernel.packet[1].x = tmp; +} + +#endif +#endif +#endif + +} // end namespace internal + +} // end namespace Eigen + + +#endif // EIGEN_PACKET_MATH_HALF_CUDA_H |