X-Git-Url: https://gerrit.o-ran-sc.org/r/gitweb?p=o-du%2Fphy.git;a=blobdiff_plain;f=fhi_lib%2Flib%2Fsrc%2Fxran_bfp_cplane64_snc.cpp;fp=fhi_lib%2Flib%2Fsrc%2Fxran_bfp_cplane64_snc.cpp;h=9279ea028e67a7a457c0bdb58327bf7f778a1519;hp=0000000000000000000000000000000000000000;hb=2de97529a4c5a1922214ba0e6f0fb84cacbd0bc7;hpb=81a09690b36b3a4e89b4dae34f30933de13f7f90

diff --git a/fhi_lib/lib/src/xran_bfp_cplane64_snc.cpp b/fhi_lib/lib/src/xran_bfp_cplane64_snc.cpp
new file mode 100644
index 0000000..9279ea0
--- /dev/null
+++ b/fhi_lib/lib/src/xran_bfp_cplane64_snc.cpp
@@ -0,0 +1,431 @@
+/******************************************************************************
+*
+*   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 64T64R
+ *
+ * @file xran_bfp_cplane64.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_64_SNC
+{
+  /// Namespace constants
+  const int k_numDataElements = 128; /// 16 IQ pairs
+  const int k_numRegsPerBlock = 4; /// Number of AVX512 registers per compression block (input)
+
+  inline int
+  maxAbsOneBlock(const __m512i* inData)
+  {
+    /// Vertical maxAbs on all registers
+    __m512i maxAbsReg = __m512i();
+#pragma unroll(k_numRegsPerBlock)
+    for (int n = 0; n < k_numRegsPerBlock; ++n)
+    {
+      const auto thisRegAbs = _mm512_abs_epi16(inData[n]);
+      maxAbsReg = _mm512_max_epi16(thisRegAbs, maxAbsReg);
+    }
+    /// Horizontal max across remaining register
+    return BlockFloatCompander::horizontalMax1x32(maxAbsReg);
+  }
+
+  /// 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(16)
+    for (int n = 0; n < 16; ++n)
+    {
+      ((uint32_t*)&maxAbs)[n] = maxAbsOneBlock(dataInAddr + n * k_numRegsPerBlock);
+    }
+    /// 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(4)
+    for (int n = 0; n < 4; ++n)
+    {
+      ((uint32_t*)&maxAbs)[n] = maxAbsOneBlock(dataInAddr + n * k_numRegsPerBlock);
+    }
+    /// 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);
+    ((uint32_t*)&maxAbs)[0] = maxAbsOneBlock(dataInAddr);
+    /// 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 int totNumBytesPerReg, const uint64_t rbWriteMask)
+  {
+    /// Store exponent first
+    *outBlockAddr = thisExp;
+#pragma unroll(k_numRegsPerBlock)
+    for (int n = 0; n < k_numRegsPerBlock; ++n)
+    {
+      /// Apply the exponent shift
+      const auto compData = _mm512_srai_epi16(dataIn[n], thisExp);
+      /// Pack compressed data network byte order
+      const auto compDataBytePacked = networkBytePack(compData);
+      /// Store compressed data
+      _mm512_mask_storeu_epi8(outBlockAddr + 1 + n * totNumBytesPerReg, rbWriteMask, compDataBytePacked);
+    }
+  }
+
+  /// 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 int totNumBytesPerReg, const uint64_t rbWriteMask)
+  {
+    const auto exponents = computeExponent_16RB(dataIn, totShiftBits);
+    const __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+#pragma unroll(16)
+    for (int n = 0; n < 16; ++n)
+    {
+      applyCompressionN_1RB<networkBytePack>(dataInAddr + n * k_numRegsPerBlock, dataOut->dataCompressed + n * totNumBytesPerBlock, dataIn.iqWidth, ((uint8_t*)&exponents)[n * 4], totNumBytesPerReg, 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 int totNumBytesPerReg, const uint64_t rbWriteMask)
+  {
+    const auto exponents = computeExponent_4RB(dataIn, totShiftBits);
+    const __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+#pragma unroll(4)
+    for (int n = 0; n < 4; ++n)
+    {
+      applyCompressionN_1RB<networkBytePack>(dataInAddr + n * k_numRegsPerBlock, dataOut->dataCompressed + n * totNumBytesPerBlock, dataIn.iqWidth, ((uint8_t*)&exponents)[n * 4], totNumBytesPerReg, 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 int totNumBytesPerReg, const uint64_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, totNumBytesPerReg, 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 int totNumBytesPerReg, const uint64_t rbWriteMask)
+  {
+    switch (dataIn.numBlocks)
+    {
+    case 16:
+      compressN_16RB<networkBytePack>(dataIn, dataOut, totShiftBits, totNumBytesPerBlock, totNumBytesPerReg, rbWriteMask);
+      break;
+
+    case 4:
+      compressN_4RB<networkBytePack>(dataIn, dataOut, totShiftBits, totNumBytesPerBlock, totNumBytesPerReg, rbWriteMask);
+      break;
+
+    case 1:
+      compressN_1RB<networkBytePack>(dataIn, dataOut, totShiftBits, totNumBytesPerBlock, totNumBytesPerReg, rbWriteMask);
+      break;
+    }
+  }
+
+
+
+  /// Apply 8b compression to 1 compression block.
+  inline void
+  applyCompression8_1RB(const __m512i* dataIn, uint8_t* outBlockAddr, const uint8_t thisExp)
+  {
+    /// Store exponent first
+    *outBlockAddr = thisExp;
+    constexpr uint32_t k_writeMask = 0xFFFFFFFF;
+    __m256i* regOutAddr = reinterpret_cast<__m256i*>(outBlockAddr + 1);
+#pragma unroll(k_numRegsPerBlock)
+    for (int n = 0; n < k_numRegsPerBlock; ++n)
+    {
+      /// Apply the exponent shift
+      const auto compData = _mm512_srai_epi16(dataIn[n], thisExp);
+      /// Truncate to 8bit and store
+      _mm256_mask_storeu_epi8(regOutAddr + n, k_writeMask, _mm512_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 __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+#pragma unroll(16)
+    for (int n = 0; n < 16; ++n)
+    {
+      applyCompression8_1RB(dataInAddr + n * k_numRegsPerBlock, 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 __m512i* dataInAddr = reinterpret_cast<const __m512i*>(dataIn.dataExpanded);
+#pragma unroll(4)
+    for (int n = 0; n < 4; ++n)
+    {
+      applyCompression8_1RB(dataInAddr + n * k_numRegsPerBlock, 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 __m512i* dataInAddr = reinterpret_cast<const __m512i*>(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::UnpackFunction networkByteUnpack>
+  inline void
+  applyExpansionN_1RB(const uint8_t* expAddr, __m512i* dataOutAddr, const int maxExpShift, const int totNumBytesPerReg)
+  {
+    static constexpr uint8_t k_WriteMask = 0xFF;
+    const auto thisExpShift = maxExpShift - *expAddr;
+#pragma unroll(k_numRegsPerBlock)
+    for (int n = 0; n < k_numRegsPerBlock; ++n)
+    {
+      const auto thisInRegAddr = expAddr + 1 + n * totNumBytesPerReg;
+      /// Unpack network order packed data
+      const auto inDataUnpacked = networkByteUnpack(thisInRegAddr);
+      /// Apply exponent scaling (by appropriate arithmetic shift right)
+      const auto expandedData = _mm512_srai_epi16(inDataUnpacked, thisExpShift);
+      /// Write expanded data to output
+      _mm512_mask_storeu_epi64(dataOutAddr + n, k_WriteMask, expandedData);
+    }
+  }
+
+  /// Calls expansion function specific to the number of blocks to be executed. For 9, 10, or 12bit iqWidth.
+  template<BlockFloatCompander::UnpackFunction networkByteUnpack>
+  void expandByAllocN(const BlockFloatCompander::CompressedData& dataIn, BlockFloatCompander::ExpandedData* dataOut,
+                      const int totNumBytesPerBlock, const int totNumBytesPerReg, const int maxExpShift)
+  {
+    __m512i* dataOutAddr = reinterpret_cast<__m512i*>(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 * k_numRegsPerBlock, maxExpShift, totNumBytesPerReg);
+      }
+      break;
+
+    case 4:
+#pragma unroll(4)
+      for (int n = 0; n < 4; ++n)
+      {
+        applyExpansionN_1RB<networkByteUnpack>(dataIn.dataCompressed + n * totNumBytesPerBlock, dataOutAddr + n * k_numRegsPerBlock, maxExpShift, totNumBytesPerReg);
+      }
+      break;
+
+    case 1:
+      applyExpansionN_1RB<networkByteUnpack>(dataIn.dataCompressed, dataOutAddr, maxExpShift, totNumBytesPerReg);
+      break;
+    }
+  }
+
+
+  /// Apply expansion to 1 compression block
+  inline void
+  applyExpansion8_1RB(const uint8_t* expAddr, __m512i* dataOutAddr)
+  {
+    const __m256i* rawDataIn = reinterpret_cast<const __m256i*>(expAddr + 1);
+    static constexpr uint8_t k_WriteMask = 0xFF;
+#pragma unroll(k_numRegsPerBlock)
+    for (int n = 0; n < k_numRegsPerBlock; ++n)
+    {
+      const auto compData16 = _mm512_cvtepi8_epi16(rawDataIn[n]);
+      const auto expData = _mm512_slli_epi16(compData16, *expAddr);
+      _mm512_mask_storeu_epi64(dataOutAddr + n, 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)
+  {
+    __m512i* dataOutAddr = reinterpret_cast<__m512i*>(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 * k_numRegsPerBlock);
+      }
+      break;
+
+    case 4:
+#pragma unroll(4)
+      for (int n = 0; n < 4; ++n)
+      {
+        applyExpansion8_1RB(dataIn.dataCompressed + n * (k_numDataElements + 1), dataOutAddr + n * k_numRegsPerBlock);
+      }
+      break;
+
+    case 1:
+      applyExpansion8_1RB(dataIn.dataCompressed, dataOutAddr);
+      break;
+    }
+  }
+}
+
+
+/// Main kernel function for 64 antenna C-plane compression.
+/// Starts by determining iqWidth specific parameters and functions.
+void
+BlockFloatCompander::BFPCompressCtrlPlane64AvxSnc(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_64_SNC::k_numDataElements * dataIn.iqWidth) >> 3) + 1;
+  /// Total number of compressed bytes to handle per register is 32 * iqWidth / 8
+  const auto totNumBytesPerReg = dataIn.iqWidth << 2;
+
+  /// Compressed data write mask for each iqWidth option
+  constexpr uint64_t rbWriteMask9 = 0x0000000FFFFFFFFF;
+  constexpr uint64_t rbWriteMask10 = 0x000000FFFFFFFFFF;
+  constexpr uint64_t rbWriteMask12 = 0x0000FFFFFFFFFFFF;
+
+  switch (dataIn.iqWidth)
+  {
+  case 8:
+    BFP_CPlane_64_SNC::compressByAlloc8(dataIn, dataOut, totShiftBits8);
+    break;
+
+  case 9:
+    BFP_CPlane_64_SNC::compressByAllocN<BlockFloatCompander::networkBytePack9bSnc>(dataIn, dataOut, totShiftBits9, totNumBytesPerBlock, totNumBytesPerReg, rbWriteMask9);
+    break;
+
+  case 10:
+    BFP_CPlane_64_SNC::compressByAllocN<BlockFloatCompander::networkBytePack10bSnc>(dataIn, dataOut, totShiftBits10, totNumBytesPerBlock, totNumBytesPerReg, rbWriteMask10);
+    break;
+
+  case 12:
+    BFP_CPlane_64_SNC::compressByAllocN<BlockFloatCompander::networkBytePack12bSnc>(dataIn, dataOut, totShiftBits12, totNumBytesPerBlock, totNumBytesPerReg, rbWriteMask12);
+    break;
+  }
+}
+
+
+/// Main kernel function for 64 antenna C-plane expansion.
+/// Starts by determining iqWidth specific parameters and functions.
+void
+BlockFloatCompander::BFPExpandCtrlPlane64AvxSnc(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_64_SNC::k_numDataElements * dataIn.iqWidth) >> 3) + 1;
+  /// Total number of compressed bytes to handle per register is 32 * iqWidth / 8
+  const auto totNumBytesPerReg = dataIn.iqWidth << 2;
+
+  switch (dataIn.iqWidth)
+  {
+  case 8:
+    BFP_CPlane_64_SNC::expandByAlloc8(dataIn, dataOut);
+    break;
+
+  case 9:
+    BFP_CPlane_64_SNC::expandByAllocN<BlockFloatCompander::networkByteUnpack9bSnc>(dataIn, dataOut, totNumBytesPerBlock, totNumBytesPerReg, k_maxExpShift9);
+    break;
+
+  case 10:
+    BFP_CPlane_64_SNC::expandByAllocN<BlockFloatCompander::networkByteUnpack10bSnc>(dataIn, dataOut, totNumBytesPerBlock, totNumBytesPerReg, k_maxExpShift10);
+    break;
+
+  case 12:
+    BFP_CPlane_64_SNC::expandByAllocN<BlockFloatCompander::networkByteUnpack12bSnc>(dataIn, dataOut, totNumBytesPerBlock, totNumBytesPerReg, k_maxExpShift12);
+    break;
+  }
+}