--- /dev/null
+/******************************************************************************
+*
+* Copyright (c) 2020 Intel.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*
+*******************************************************************************/
+
+/**
+ * @brief xRAN BFP compression/decompression for C-plane with 8T8R
+ *
+ * @file xran_bfp_cplane8.cpp
+ * @ingroup group_source_xran
+ * @author Intel Corporation
+ **/
+
+#include "xran_compression.hpp"
+#include "xran_bfp_utils.hpp"
+#include "xran_bfp_byte_packing_utils.hpp"
+#include <complex>
+#include <algorithm>
+#include <immintrin.h>
+
+
+namespace BFP_CPlane_8_SNC
+{
+ /// Namespace constants
+ const int k_numDataElements = 16; /// 16 IQ pairs
+
+ inline __m512i
+ maxAbsOneReg(const __m512i maxAbs, const __m512i* inData, const int pairNum)
+ {
+ /// Compute abs of input data
+ const auto thisRegAbs = _mm512_abs_epi16(*inData);
+ /// Swap each IQ pair in each lane (via 32b rotation) and compute max of
+ /// each pair.
+ const auto maxRot16 = _mm512_rol_epi32(thisRegAbs, BlockFloatCompander::k_numBitsIQ);
+ const auto maxAbsIQ = _mm512_max_epi16(thisRegAbs, maxRot16);
+ /// Convert to 32b values
+ const auto maxAbsIQ32 = BlockFloatCompander::maskUpperWord(maxAbsIQ);
+ /// Swap 32b in each 64b chunk via rotation and compute 32b max
+ /// Results in blocks of 64b with 4 repeated 16b max values
+ const auto maxRot32 = _mm512_rol_epi64(maxAbsIQ32, BlockFloatCompander::k_numBitsIQPair);
+ const auto maxAbs32 = _mm512_max_epi32(maxAbsIQ32, maxRot32);
+ /// First 64b permute and max
+ /// Results in blocks of 128b with 8 repeated 16b max values
+ constexpr uint8_t k_perm64A = 0xB1;
+ const auto maxPerm64A = _mm512_permutex_epi64(maxAbs32, k_perm64A);
+ const auto maxAbs64 = _mm512_max_epi64(maxAbs32, maxPerm64A);
+ /// Second 64b permute and max
+ /// Results in blocks of 256b with 16 repeated 16b max values
+ constexpr uint8_t k_perm64B = 0x4E;
+ const auto maxPerm64B = _mm512_permutex_epi64(maxAbs64, k_perm64B);
+ const auto maxAbs128 = _mm512_max_epi64(maxAbs64, maxPerm64B);
+ /// Now register contains repeated max values for two compression blocks
+ /// Permute the desired results into maxAbs
+ const auto k_selectVals = _mm512_set_epi32(24, 16, 24, 16, 24, 16, 24, 16,
+ 24, 16, 24, 16, 24, 16, 24, 16);
+ constexpr uint16_t k_2ValsMsk[8] = { 0x0003, 0x000C, 0x0030, 0x00C0, 0x0300, 0x0C00, 0x3000, 0xC000 };
+ return _mm512_mask_permutex2var_epi32(maxAbs, k_2ValsMsk[pairNum], k_selectVals, maxAbs128);
+ }
+
+ /// Compute exponent value for a set of 16 RB from the maximum absolute value.
+ inline __m512i
+ computeExponent_16RB(const BlockFloatCompander::ExpandedData& dataIn, const __m512i totShiftBits)
+ {
+ __m512i maxAbs = __m512i();
+ const __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+#pragma unroll(8)
+ for (int n = 0; n < 8; ++n)
+ {
+ maxAbs = maxAbsOneReg(maxAbs, dataInAddr + n, n);
+ }
+ /// Calculate exponent
+ return BlockFloatCompander::expLzCnt(maxAbs, totShiftBits);
+ }
+
+ /// Compute exponent value for a set of 4 RB from the maximum absolute value.
+ inline __m512i
+ computeExponent_4RB(const BlockFloatCompander::ExpandedData& dataIn, const __m512i totShiftBits)
+ {
+ __m512i maxAbs = __m512i();
+ const __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+#pragma unroll(2)
+ for (int n = 0; n < 2; ++n)
+ {
+ maxAbs = maxAbsOneReg(maxAbs, dataInAddr + n, n);
+ }
+ /// Calculate exponent
+ return BlockFloatCompander::expLzCnt(maxAbs, totShiftBits);
+ }
+
+ /// Compute exponent value for 1 RB from the maximum absolute value.
+ inline uint8_t
+ computeExponent_1RB(const BlockFloatCompander::ExpandedData& dataIn, const __m512i totShiftBits)
+ {
+ __m512i maxAbs = __m512i();
+ const __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+ maxAbs = maxAbsOneReg(maxAbs, dataInAddr, 0);
+ /// Calculate exponent
+ const auto exps = BlockFloatCompander::expLzCnt(maxAbs, totShiftBits);
+ return ((uint8_t*)&exps)[0];
+ }
+
+
+
+ /// Apply compression to one compression block
+ template<BlockFloatCompander::PackFunction networkBytePack>
+ inline void
+ applyCompressionN_1RB(const __m512i* dataIn, uint8_t* outBlockAddr,
+ const int iqWidth, const uint8_t thisExp, const uint32_t rbWriteMask)
+ {
+ /// Store exponents first
+ *outBlockAddr = thisExp;
+ /// Apply the exponent shift
+ /// First Store the two exponent values in one register
+ const auto compData = _mm512_srai_epi16(*dataIn, thisExp);
+ /// Pack compressed data network byte order
+ const auto compDataBytePacked = networkBytePack(compData);
+ /// Store compressed data
+ _mm256_mask_storeu_epi8(outBlockAddr + 1, rbWriteMask, _mm512_extracti64x4_epi64(compDataBytePacked, 0));
+ }
+
+ /// Apply compression to two compression blocks
+ template<BlockFloatCompander::PackFunction networkBytePack>
+ inline void
+ applyCompressionN_2RB(const __m512i* dataIn, uint8_t* outBlockAddr,
+ const int totNumBytesPerBlock, const int iqWidth, const uint8_t* theseExps, const uint32_t rbWriteMask)
+ {
+ /// Store exponents first
+ *outBlockAddr = theseExps[0];
+ *(outBlockAddr + totNumBytesPerBlock) = theseExps[4];
+ /// Apply the exponent shift
+ /// First Store the two exponent values in one register
+ __m512i thisExp = __m512i();
+ constexpr uint32_t k_firstExpMask = 0x0000FFFF;
+ thisExp = _mm512_mask_set1_epi16(thisExp, k_firstExpMask, theseExps[0]);
+ constexpr uint32_t k_secondExpMask = 0xFFFF0000;
+ thisExp = _mm512_mask_set1_epi16(thisExp, k_secondExpMask, theseExps[4]);
+ const auto compData = _mm512_srav_epi16(*dataIn, thisExp);
+ /// Pack compressed data network byte order
+ const auto compDataBytePacked = networkBytePack(compData);
+ /// Output of network byte packing has each compression block packed in each half register
+ /// Store compressed data
+ _mm256_mask_storeu_epi8(outBlockAddr + 1, rbWriteMask, _mm512_extracti64x4_epi64(compDataBytePacked, 0));
+ _mm256_mask_storeu_epi8(outBlockAddr + totNumBytesPerBlock + 1, rbWriteMask, _mm512_extracti64x4_epi64(compDataBytePacked, 1));
+ }
+
+ /// Derive and apply 9, 10, or 12bit compression to 16 compression blocks
+ template<BlockFloatCompander::PackFunction networkBytePack>
+ inline void
+ compressN_16RB(const BlockFloatCompander::ExpandedData& dataIn, BlockFloatCompander::CompressedData* dataOut,
+ const __m512i totShiftBits, const int totNumBytesPerBlock, const uint32_t rbWriteMask)
+ {
+ const auto exponents = computeExponent_16RB(dataIn, totShiftBits);
+ const __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+#pragma unroll(8)
+ for (int n = 0; n < 8; ++n)
+ {
+ applyCompressionN_2RB<networkBytePack>(dataInAddr + n, dataOut->dataCompressed + n * 2 * totNumBytesPerBlock, totNumBytesPerBlock, dataIn.iqWidth, ((uint8_t*)&exponents) + n * 8, rbWriteMask);
+ }
+ }
+
+ /// Derive and apply 9, 10, or 12bit compression to 4 compression blocks
+ template<BlockFloatCompander::PackFunction networkBytePack>
+ inline void
+ compressN_4RB(const BlockFloatCompander::ExpandedData& dataIn, BlockFloatCompander::CompressedData* dataOut,
+ const __m512i totShiftBits, const int totNumBytesPerBlock, const uint32_t rbWriteMask)
+ {
+ const auto exponents = computeExponent_4RB(dataIn, totShiftBits);
+ const __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+#pragma unroll(2)
+ for (int n = 0; n < 2; ++n)
+ {
+ applyCompressionN_2RB<networkBytePack>(dataInAddr + n, dataOut->dataCompressed + n * 2 * totNumBytesPerBlock, totNumBytesPerBlock, dataIn.iqWidth, ((uint8_t*)&exponents) + n * 8, rbWriteMask);;
+ }
+ }
+
+ /// Derive and apply 9, 10, or 12bit compression to 1 RB
+ template<BlockFloatCompander::PackFunction networkBytePack>
+ inline void
+ compressN_1RB(const BlockFloatCompander::ExpandedData& dataIn, BlockFloatCompander::CompressedData* dataOut,
+ const __m512i totShiftBits, const int totNumBytesPerBlock, const uint32_t rbWriteMask)
+ {
+ const auto thisExponent = computeExponent_1RB(dataIn, totShiftBits);
+ const __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+ applyCompressionN_1RB<networkBytePack>(dataInAddr, dataOut->dataCompressed, dataIn.iqWidth, thisExponent, rbWriteMask);
+ }
+
+ /// Calls compression function specific to the number of blocks to be executed. For 9, 10, or 12bit iqWidth.
+ template<BlockFloatCompander::PackFunction networkBytePack>
+ inline void
+ compressByAllocN(const BlockFloatCompander::ExpandedData& dataIn, BlockFloatCompander::CompressedData* dataOut,
+ const __m512i totShiftBits, const int totNumBytesPerBlock, const uint32_t rbWriteMask)
+ {
+ switch (dataIn.numBlocks)
+ {
+ case 16:
+ compressN_16RB<networkBytePack>(dataIn, dataOut, totShiftBits, totNumBytesPerBlock, rbWriteMask);
+ break;
+
+ case 4:
+ compressN_4RB<networkBytePack>(dataIn, dataOut, totShiftBits, totNumBytesPerBlock, rbWriteMask);
+ break;
+
+ case 1:
+ compressN_1RB<networkBytePack>(dataIn, dataOut, totShiftBits, totNumBytesPerBlock, rbWriteMask);
+ break;
+ }
+ }
+
+
+
+ /// Apply 8b compression to 1 compression block.
+ inline void
+ applyCompression8_1RB(const __m256i* dataIn, uint8_t* outBlockAddr, const uint8_t thisExp)
+ {
+ /// Store exponent first
+ *outBlockAddr = thisExp;
+ /// Apply the exponent shift
+ const auto compData = _mm256_srai_epi16(*dataIn, thisExp);
+ /// Truncate to 8bit and store
+ constexpr uint16_t k_writeMask = 0xFFFF;
+ _mm_mask_storeu_epi8(outBlockAddr + 1, k_writeMask, _mm256_cvtepi16_epi8(compData));
+ }
+
+ /// Derive and apply 8b compression to 16 compression blocks
+ inline void
+ compress8_16RB(const BlockFloatCompander::ExpandedData& dataIn, BlockFloatCompander::CompressedData* dataOut, const __m512i totShiftBits)
+ {
+ const auto exponents = computeExponent_16RB(dataIn, totShiftBits);
+ const __m256i* dataInAddr = reinterpret_cast<const __m256i*>(dataIn.dataExpanded);
+#pragma unroll(16)
+ for (int n = 0; n < 16; ++n)
+ {
+ applyCompression8_1RB(dataInAddr + n, dataOut->dataCompressed + n * (k_numDataElements + 1), ((uint8_t*)&exponents)[n * 4]);
+ }
+ }
+
+ /// Derive and apply 8b compression to 4 compression blocks
+ inline void
+ compress8_4RB(const BlockFloatCompander::ExpandedData& dataIn, BlockFloatCompander::CompressedData* dataOut, const __m512i totShiftBits)
+ {
+ const auto exponents = computeExponent_4RB(dataIn, totShiftBits);
+ const __m256i* dataInAddr = reinterpret_cast<const __m256i*>(dataIn.dataExpanded);
+#pragma unroll(4)
+ for (int n = 0; n < 4; ++n)
+ {
+ applyCompression8_1RB(dataInAddr + n, dataOut->dataCompressed + n * (k_numDataElements + 1), ((uint8_t*)&exponents)[n * 4]);
+ }
+ }
+
+ /// Derive and apply 8b compression to 1 compression block
+ inline void
+ compress8_1RB(const BlockFloatCompander::ExpandedData& dataIn, BlockFloatCompander::CompressedData* dataOut, const __m512i totShiftBits)
+ {
+ const auto thisExponent = computeExponent_1RB(dataIn, totShiftBits);
+ const __m256i* dataInAddr = reinterpret_cast<const __m256i*>(dataIn.dataExpanded);
+ applyCompression8_1RB(dataInAddr, dataOut->dataCompressed, thisExponent);
+ }
+
+ /// Calls compression function specific to the number of RB to be executed. For 8 bit iqWidth.
+ inline void
+ compressByAlloc8(const BlockFloatCompander::ExpandedData& dataIn, BlockFloatCompander::CompressedData* dataOut, const __m512i totShiftBits)
+ {
+ switch (dataIn.numBlocks)
+ {
+ case 16:
+ compress8_16RB(dataIn, dataOut, totShiftBits);
+ break;
+
+ case 4:
+ compress8_4RB(dataIn, dataOut, totShiftBits);
+ break;
+
+ case 1:
+ compress8_1RB(dataIn, dataOut, totShiftBits);
+ break;
+ }
+ }
+
+
+ /// Expand 1 compression block
+ template<BlockFloatCompander::UnpackFunction256 networkByteUnpack>
+ inline void
+ applyExpansionN_1RB(const uint8_t* expAddr, __m256i* dataOutAddr, const int maxExpShift)
+ {
+ const auto thisExpShift = maxExpShift - *expAddr;
+ /// Unpack network order packed data
+ const auto inDataUnpacked = networkByteUnpack(expAddr + 1);
+ /// Apply exponent scaling (by appropriate arithmetic shift right)
+ const auto expandedData = _mm256_srai_epi16(inDataUnpacked, thisExpShift);
+ /// Write expanded data to output
+ static constexpr uint8_t k_WriteMask = 0x0F;
+ _mm256_mask_storeu_epi64(dataOutAddr, k_WriteMask, expandedData);
+ }
+
+ /// Calls expansion function specific to the number of blocks to be executed. For 9, 10, or 12bit iqWidth.
+ template<BlockFloatCompander::UnpackFunction256 networkByteUnpack>
+ void expandByAllocN(const BlockFloatCompander::CompressedData& dataIn, BlockFloatCompander::ExpandedData* dataOut,
+ const int totNumBytesPerBlock, const int maxExpShift)
+ {
+ __m256i* dataOutAddr = reinterpret_cast<__m256i*>(dataOut->dataExpanded);
+ switch (dataIn.numBlocks)
+ {
+ case 16:
+#pragma unroll(16)
+ for (int n = 0; n < 16; ++n)
+ {
+ applyExpansionN_1RB<networkByteUnpack>(dataIn.dataCompressed + n * totNumBytesPerBlock, dataOutAddr + n, maxExpShift);
+ }
+ break;
+
+ case 4:
+#pragma unroll(4)
+ for (int n = 0; n < 4; ++n)
+ {
+ applyExpansionN_1RB<networkByteUnpack>(dataIn.dataCompressed + n * totNumBytesPerBlock, dataOutAddr + n, maxExpShift);
+ }
+ break;
+
+ case 1:
+ applyExpansionN_1RB<networkByteUnpack>(dataIn.dataCompressed, dataOutAddr, maxExpShift);
+ break;
+ }
+ }
+
+
+ /// Apply expansion to 2 compression block
+ inline void
+ applyExpansion8_1RB(const uint8_t* expAddr, __m256i* dataOutAddr)
+ {
+ const __m128i* rawDataIn = reinterpret_cast<const __m128i*>(expAddr + 1);
+ const auto compData16 = _mm256_cvtepi8_epi16(*rawDataIn);
+ const auto expData = _mm256_slli_epi16(compData16, *expAddr);
+ static constexpr uint8_t k_WriteMask = 0x0F;
+ _mm256_mask_storeu_epi64(dataOutAddr, k_WriteMask, expData);
+ }
+
+ /// Calls expansion function specific to the number of RB to be executed. For 8 bit iqWidth.
+ void
+ expandByAlloc8(const BlockFloatCompander::CompressedData& dataIn, BlockFloatCompander::ExpandedData* dataOut)
+ {
+ __m256i* dataOutAddr = reinterpret_cast<__m256i*>(dataOut->dataExpanded);
+ switch (dataIn.numBlocks)
+ {
+ case 16:
+#pragma unroll(16)
+ for (int n = 0; n < 16; ++n)
+ {
+ applyExpansion8_1RB(dataIn.dataCompressed + n * (k_numDataElements + 1), dataOutAddr + n);
+ }
+ break;
+
+ case 4:
+#pragma unroll(4)
+ for (int n = 0; n < 4; ++n)
+ {
+ applyExpansion8_1RB(dataIn.dataCompressed + n * (k_numDataElements + 1), dataOutAddr + n);
+ }
+ break;
+
+ case 1:
+ applyExpansion8_1RB(dataIn.dataCompressed, dataOutAddr);
+ break;
+ }
+ }
+}
+
+
+/// Main kernel function for 8 antenna C-plane compression.
+/// Starts by determining iqWidth specific parameters and functions.
+void
+BlockFloatCompander::BFPCompressCtrlPlane8AvxSnc(const ExpandedData& dataIn, CompressedData* dataOut)
+{
+ /// Compensation for extra zeros in 32b leading zero count when computing exponent
+ const auto totShiftBits8 = _mm512_set1_epi32(25);
+ const auto totShiftBits9 = _mm512_set1_epi32(24);
+ const auto totShiftBits10 = _mm512_set1_epi32(23);
+ const auto totShiftBits12 = _mm512_set1_epi32(21);
+
+ /// Total number of data bytes per compression block is (iqWidth * numElements / 8) + 1
+ const auto totNumBytesPerBlock = ((BFP_CPlane_8_SNC::k_numDataElements * dataIn.iqWidth) >> 3) + 1;
+
+ /// Compressed data write mask for each iqWidth option
+ /// Compressed data write mask for each iqWidth option
+ constexpr uint32_t rbWriteMask9 = 0x0003FFFF;
+ constexpr uint32_t rbWriteMask10 = 0x000FFFFF;
+ constexpr uint32_t rbWriteMask12 = 0x00FFFFFF;
+
+ switch (dataIn.iqWidth)
+ {
+ case 8:
+ BFP_CPlane_8_SNC::compressByAlloc8(dataIn, dataOut, totShiftBits8);
+ break;
+
+ case 9:
+ BFP_CPlane_8_SNC::compressByAllocN<BlockFloatCompander::networkBytePack9bSncB>(dataIn, dataOut, totShiftBits9, totNumBytesPerBlock, rbWriteMask9);
+ break;
+
+ case 10:
+ BFP_CPlane_8_SNC::compressByAllocN<BlockFloatCompander::networkBytePack10bSncB>(dataIn, dataOut, totShiftBits10, totNumBytesPerBlock, rbWriteMask10);
+ break;
+
+ case 12:
+ BFP_CPlane_8_SNC::compressByAllocN<BlockFloatCompander::networkBytePack12bSncB>(dataIn, dataOut, totShiftBits12, totNumBytesPerBlock, rbWriteMask12);
+ break;
+ }
+}
+
+
+/// Main kernel function for 8 antenna C-plane expansion.
+/// Starts by determining iqWidth specific parameters and functions.
+void
+BlockFloatCompander::BFPExpandCtrlPlane8AvxSnc(const CompressedData& dataIn, ExpandedData* dataOut)
+{
+ constexpr int k_maxExpShift9 = 7;
+ constexpr int k_maxExpShift10 = 6;
+ constexpr int k_maxExpShift12 = 4;
+
+ /// Total number of data bytes per compression block is (iqWidth * numElements / 8) + 1
+ const auto totNumBytesPerBlock = ((BFP_CPlane_8_SNC::k_numDataElements * dataIn.iqWidth) >> 3) + 1;
+
+ switch (dataIn.iqWidth)
+ {
+ case 8:
+ BFP_CPlane_8_SNC::expandByAlloc8(dataIn, dataOut);
+ break;
+
+ case 9:
+ BFP_CPlane_8_SNC::expandByAllocN<BlockFloatCompander::networkByteUnpack9b256Snc>(dataIn, dataOut, totNumBytesPerBlock, k_maxExpShift9);
+ break;
+
+ case 10:
+ BFP_CPlane_8_SNC::expandByAllocN<BlockFloatCompander::networkByteUnpack10b256Snc>(dataIn, dataOut, totNumBytesPerBlock, k_maxExpShift10);
+ break;
+
+ case 12:
+ BFP_CPlane_8_SNC::expandByAllocN<BlockFloatCompander::networkByteUnpack12b256Snc>(dataIn, dataOut, totNumBytesPerBlock, k_maxExpShift12);
+ break;
+ }
+}
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