Changeset 6135


Ignore:
Timestamp:
Jul 30, 2018, 1:36:48 AM (3 weeks ago)
Author:
xwa163
Message:
  1. Implement twist_kernel and untwist_kernel by PEXT and PDEP
  2. Use twist form for multiplexing lz4 grep
Location:
icGREP/icgrep-devel/icgrep
Files:
6 added
2 deleted
10 edited

Legend:

Unmodified
Added
Removed

  • icGREP/icgrep-devel/icgrep/CMakeLists.txt

    r6133 r6135  
    103103add_library(UCDlib UCD/CaseFolding.cpp utf8_encoder.cpp utf16_encoder.cpp UCD/ucd_compiler.cpp UCD/PropertyObjects.cpp UCD/resolve_properties.cpp)
    104104add_library(GrepEngine  ${GREP_CORE_SRC} grep/grep_engine.cpp kernels/cc_kernel.cpp kernels/cc_scan_kernel.cpp kernels/charclasses.cpp kernels/streams_merge.cpp kernels/until_n.cpp kernels/UCD_property_kernel.cpp kernels/grapheme_kernel.cpp)
    105 add_library(LZ4_Lib lz4FrameDecoder.cpp kernels/cc_kernel.cpp kernels/lz4/lz4_deposit_uncompressed.cpp kernels/lz4/lz4_generate_deposit_stream.cpp kernels/pdep_kernel.cpp lz4/LZ4Generator.cpp kernels/lz4/lz4_block_decoder.cpp kernels/lz4/lz4_index_builder.cpp kernels/lz4/lz4_swizzled_match_copy_kernel.cpp kernels/bitstream_pdep_kernel.cpp kernels/bitstream_gather_pdep_kernel.cpp kernels/swizzled_multiple_pdep_kernel.cpp kernels/lz4/lz4_bitstream_not_kernel.cpp kernels/lz4/lz4_bitstream_match_copy_kernel.cpp kernels/fake_stream_generating_kernel.cpp kernels/lz4/aio/lz4_bytestream_aio.cpp kernels/lz4/aio/lz4_swizzled_aio.cpp kernels/lz4/aio/lz4_parallel_bytestream_aio.cpp kernels/lz4/aio/lz4_sequential_aio_base.cpp kernels/lz4/aio/lz4_sequential_aio_base.h kernels/lz4/aio/lz4_bitstream_aio.cpp kernels/lz4/aio/lz4_bitstream_aio.h kernels/lz4/aio/lz4_i4_bytestream_aio.cpp kernels/lz4/aio/lz4_i4_bytestream_aio.h)
     105add_library(LZ4_Lib lz4FrameDecoder.cpp kernels/cc_kernel.cpp kernels/lz4/lz4_deposit_uncompressed.cpp kernels/lz4/lz4_generate_deposit_stream.cpp kernels/pdep_kernel.cpp lz4/LZ4Generator.cpp kernels/lz4/lz4_block_decoder.cpp kernels/lz4/lz4_index_builder.cpp kernels/lz4/lz4_swizzled_match_copy_kernel.cpp kernels/bitstream_pdep_kernel.cpp kernels/bitstream_gather_pdep_kernel.cpp kernels/swizzled_multiple_pdep_kernel.cpp kernels/lz4/lz4_bitstream_not_kernel.cpp kernels/lz4/lz4_bitstream_match_copy_kernel.cpp kernels/fake_stream_generating_kernel.cpp kernels/lz4/aio/lz4_bytestream_aio.cpp kernels/lz4/aio/lz4_swizzled_aio.cpp kernels/lz4/aio/lz4_parallel_bytestream_aio.cpp kernels/lz4/aio/lz4_sequential_aio_base.cpp kernels/lz4/aio/lz4_bitstream_aio.cpp kernels/lz4/aio/lz4_twist_aio.cpp kernels/lz4/aio/twist_kernel.cpp kernels/lz4/aio/untwist_kernel.cpp)
    106106add_library(LZParabix_Lib lzparabix/LZParabixGenerator.cpp kernels/lzparabix/decoder/LZParabixBlockDecoder.cpp kernels/lzparabix/decoder/LZParabixAioBaseKernel.cpp lzparabix/LZParabixGrepGenerator.cpp kernels/fake_stream_generating_kernel.cpp kernels/lzparabix/encoder/LZParabixCompressionKernel.cpp kernels/lzparabix/decoder/LZParabixLiteralDecoderKernel.cpp kernels/lzparabix/decoder/LZParabixBitStreamAioKernel.cpp kernels/lzparabix/decoder/LZParabixSwizzledAioKernel.cpp)
    107107

  • icGREP/icgrep-devel/icgrep/kernels/lz4/aio/lz4_sequential_aio_base.cpp

    r6132 r6135  
    4343
    4444                                           Binding{b->getInt1Ty(), "hasCallInitialization"}
    45 
    46 
    4745                                   }),
    4846             mBlockSize(blockSize) {

  • icGREP/icgrep-devel/icgrep/kernels/lz4/aio/lz4_sequential_aio_base.h

    r6132 r6135  
    2929    const static unsigned int ACCELERATION_WIDTH = 64;
    3030    const unsigned mBlockSize;
     31    const unsigned COPY_FW = 64;
     32    const unsigned BYTE_WIDTH = 8;
    3133
    3234    // ---- Kernel Methods

  • icGREP/icgrep-devel/icgrep/kernels/p2s_kernel.cpp

    r6132 r6135  
    4747
    4848
    49     P2S4StreamByPDEP::P2S4StreamByPDEP(const std::unique_ptr<kernel::KernelBuilder> & b)
    50             : BlockOrientedKernel("P2S4StreamByPDEP",
    51                                   {Binding{b->getStreamSetTy(4, 1), "basisBits"}},
    52                                   {Binding{b->getStreamSetTy(1, 4), "byteStream"}},
    53                                   {}, {}, {})
    54     {
    55     }
    56 
    57 
    58     void P2S4StreamByPDEP::generateDoBlockMethod(const std::unique_ptr<KernelBuilder> & b) {
    59         Function * PDEPFunc = Intrinsic::getDeclaration(getModule(), Intrinsic::x86_bmi_pdep_64);
    60         uint64_t pdepBaseMask = 0x1111111111111111;
    61 
    62         Value* inputBlocks[4];
    63 
    64         for (unsigned i = 0; i < 4; i++) {
    65             inputBlocks[i] = b->loadInputStreamBlock("basisBits", b->getInt32(i));
    66         }
    67         Value* outputBasePtr = b->CreatePointerCast(b->getOutputStreamBlockPtr("byteStream", b->getSize(0)), b->getInt64Ty()->getPointerTo());
    68 
    69         for (unsigned i = 0; i < b->getBitBlockWidth() / 64; i++) {
    70             Value* currentInput[4];
    71             for (unsigned iIndex = 0; iIndex < 4; iIndex++) {
    72                 currentInput[iIndex] = b->CreateExtractElement(inputBlocks[iIndex], i);
    73             }
    74 
    75             for (unsigned j = 0; j < 4; j++) {
    76                 unsigned outputIndex = i * 4 + j;
    77                 Value* retI64 = b->getInt64(0);
    78                 for (unsigned k = 0; k < 4; k++) {
    79                     Value* newBits = b->CreateCall(
    80                             PDEPFunc,{
    81                                     b->CreateLShr(currentInput[k], b->getInt64(j * 16)),
    82                                     b->getInt64(pdepBaseMask << k)
    83                             }
    84                     );
    85                     retI64 = b->CreateOr(retI64, newBits);
    86                 }
    87                 b->CreateStore(retI64, b->CreateGEP(outputBasePtr, b->getInt32(outputIndex)));
    88             }
    89         }
    90 
    91 //        for (unsigned i = 0; i < 4; i++) {
    92 //            b->CallPrintRegister("input" + std::to_string(i), inputBlocks[i]);
    93 //        }
    94 //
    95 //        Value* outputBaseBlockPtr = b->CreatePointerCast(b->getOutputStreamBlockPtr("byteStream", b->getSize(0)), b->getBitBlockType()->getPointerTo());
    96 //        for (unsigned i = 0; i < 4; i++) {
    97 //            b->CallPrintRegister("output" + std::to_string(i), b->CreateLoad(b->CreateGEP(outputBaseBlockPtr, b->getInt32(i))));
    98 //        }
    99 
    100     }
     49
    10150
    10251               
    … …  
    269218    mBasisSetNumbering(numbering) {
    270219}
    271    
    272    
    273 }
     220
     221}

  • icGREP/icgrep-devel/icgrep/kernels/p2s_kernel.h

    r6132 r6135  
    1212
    1313namespace kernel {
    14 
    15     class P2S4StreamByPDEP final : public BlockOrientedKernel{
    16     public:
    17         P2S4StreamByPDEP(const std::unique_ptr<kernel::KernelBuilder> & b);
    18     private:
    19         void generateDoBlockMethod(const std::unique_ptr<kernel::KernelBuilder> & b) override;
    20     };
    2114
    2215class P2SKernel final : public BlockOrientedKernel {

  • icGREP/icgrep-devel/icgrep/kernels/s2p_kernel.cpp

    r6132 r6135  
    1717
    1818const int PACK_LANES = 2;
    19 
    2019void s2p_step(const std::unique_ptr<KernelBuilder> & iBuilder, Value * s0, Value * s1, Value * hi_mask, unsigned shift, Value * &p0, Value * &p1) {
    2120    Value * t0 = nullptr;
    … …  
    3130        t0 = iBuilder->hsimd_packh(16, s0, s1);
    3231        t1 = iBuilder->hsimd_packl(16, s0, s1);
    33     }
    34     if (shift == 1) {
    35 //        iBuilder->CallPrintRegister("t0", t0);
    36 //        iBuilder->CallPrintRegister("t1", t1);
    3732    }
    3833
    … …  
    5651        s2p_step(iBuilder, bit2200[0], bit2200[1],
    5752                 iBuilder->simd_himask(4), 2, out[2], out[0]);
    58         for (unsigned i = 0; i < 4; i++) {
    59 //            iBuilder->CallPrintRegister("input" + std::to_string(i), input[i]);
    60         }
    61         for (unsigned i = 0; i < 4; i++) {
    62 //            iBuilder->CallPrintRegister("out" + std::to_string(i), out[i]);
    63         }
    6453    }
    6554
    … …  
    6857    Value * bit66442200[4];
    6958    Value * bit77553311[4];
    70 //    iBuilder->CallPrintRegister("himask2", iBuilder->simd_himask(2));
    71 //    iBuilder->CallPrintRegister("himask4", iBuilder->simd_himask(4));
    72 //    iBuilder->CallPrintRegister("himask8", iBuilder->simd_himask(8));
    7359
    7460    for (unsigned i = 0; i < 4; i++) {
    7561        Value * s0 = input[2 * i];
    7662        Value * s1 = input[2 * i + 1];
    77 //        iBuilder->CallPrintRegister("s0_" + std::to_string(2 * i), s0);
    78 //        iBuilder->CallPrintRegister("s1_" + std::to_string(2 * i + 1), s1);
    7963        s2p_step(iBuilder, s0, s1, iBuilder->simd_himask(2), 1, bit77553311[i], bit66442200[i]);
    80 //        iBuilder->CallPrintRegister("bit77553311", bit77553311[i]);
    81 //        iBuilder->CallPrintRegister("bit66442200", bit66442200[i]);
    8264    }
    8365    Value * bit44440000[2];
    … …  
    10284        s2p_step(iBuilder, bit66662222[0], bit66662222[1], iBuilder->simd_himask(8), 4, output[1], output[5]);
    10385        s2p_step(iBuilder, bit77773333[0], bit77773333[1], iBuilder->simd_himask(8), 4, output[0], output[4]);
    104     }
    105 
    106     for (unsigned i = 0; i < 8; i++) {
    107 //        iBuilder->CallPrintRegister("input" + std::to_string(i), input[i]);
    108     }
    109     for (unsigned i = 0; i < 8; i++) {
    110 //        iBuilder->CallPrintRegister("output" + std::to_string(i), output[i]);
    11186    }
    11287}
    … …  
    155130#endif
    156131
    157 
    158     S2P4StreamByPEXTKernel::S2P4StreamByPEXTKernel(const std::unique_ptr<kernel::KernelBuilder> & b)
    159             :BlockOrientedKernel("s2p4StreamByPEXT",
    160                                  {
    161                                          Binding{b->getStreamSetTy(1, 4), "byteStream", FixedRate(), Principal()}
    162                                  },
    163                                  {
    164                                          Binding{b->getStreamSetTy(4, 1), "basisBits"}
    165                                  }, {}, {}, {}) {
    166 
    167     }
    168 
    169     void S2P4StreamByPEXTKernel::generateDoBlockMethod(const std::unique_ptr<KernelBuilder> & b) {
    170         Function* PEXT_func = Intrinsic::getDeclaration(b->getModule(), Intrinsic::x86_bmi_pext_64);
    171         uint64_t pextBaseMask = 0x1111111111111111;
    172 
    173         Value* inputBasePtr = b->CreatePointerCast(b->getInputStreamBlockPtr("byteStream", b->getSize(0)), b->getInt64Ty()->getPointerTo());
    174 
    175         Value* outputBlocks[4];
    176         for (unsigned i = 0; i < 4; i++) {
    177             outputBlocks[i] = ConstantVector::getNullValue(b->getBitBlockType());
    178         }
    179 
    180         for (unsigned i = 0; i < b->getBitBlockWidth() / 64; i++) {
    181             Value* currentOutput[4];
    182             for (unsigned iIndex = 0; iIndex < 4; iIndex++) {
    183                 currentOutput[iIndex] = b->getInt64(0);
    184             }
    185 
    186             for (unsigned j = 0; j < 4; j++) {
    187                 unsigned inputIndex = i * 4 + j;
    188 
    189                 Value* currentInput = b->CreateLoad(b->CreateGEP(inputBasePtr, b->getInt32(inputIndex)));
    190                 for (unsigned k = 0; k < 4; k++) {
    191 
    192                     Value* newBits = b->CreateCall(
    193                             PEXT_func,{
    194                                     currentInput,
    195                                     b->getInt64(pextBaseMask << k)
    196                             }
    197                     );
    198 
    199                     currentOutput[k] = b->CreateOr(currentOutput[k], b->CreateShl(newBits, 16 * j));
    200                 }
    201             }
    202 
    203             for (unsigned iIndex = 0; iIndex < 4; iIndex++) {
    204                 outputBlocks[iIndex] = b->CreateInsertElement(outputBlocks[iIndex], currentOutput[iIndex], i);
    205             }
    206         }
    207 
    208         for (unsigned i = 0; i < 4; i++) {
    209             b->storeOutputStreamBlock("basisBits", b->getInt32(i), outputBlocks[i]);
    210 //            b->CallPrintRegister("outputBlocks" + std::to_string(i), outputBlocks[i]);
    211         }
    212     }
    213 
    214132void S2PKernel::generateMultiBlockLogic(const std::unique_ptr<KernelBuilder> & kb, Value * const numOfBlocks) {
    215133    BasicBlock * entry = kb->GetInsertBlock();
    … …  
    345263}
    346264
    347 }
     265
     266}

  • icGREP/icgrep-devel/icgrep/kernels/s2p_kernel.h

    r6132 r6135  
    1515
    1616namespace kernel {
    17 
    18     class S2P4StreamByPEXTKernel final : public BlockOrientedKernel{
    19     public:
    20         S2P4StreamByPEXTKernel(const std::unique_ptr<kernel::KernelBuilder> & b);
    21     protected:
    22         void generateDoBlockMethod(const std::unique_ptr<KernelBuilder> & b) override;
    23     };
    2417
    2518class S2PKernel final : public MultiBlockKernel {

  • icGREP/icgrep-devel/icgrep/lz4/LZ4Generator.cpp

    r6132 r6135  
    2727#include <kernels/lz4/aio/lz4_swizzled_aio.h>
    2828#include <kernels/lz4/aio/lz4_bitstream_aio.h>
    29 #include <kernels/lz4/aio/lz4_i4_bytestream_aio.h>
     29#include <kernels/lz4/aio/lz4_twist_aio.h>
    3030#include <kernels/bitstream_pdep_kernel.h>
    3131#include <kernels/lz4/lz4_bitstream_not_kernel.h>
     32#include <kernels/lz4/aio/twist_kernel.h>
     33#include <kernels/lz4/aio/untwist_kernel.h>
    3234
    3335namespace re { class CC; }
    … …  
    428430
    429431
    430     if (compressedBitStreams[0]->getNumOfStreams() == 4) {
    431         StreamSetBuffer* twistedCharClasses = mGrepDriver->addBuffer<StaticBuffer>(iBuilder, iBuilder->getStreamSetTy(1, 4), this->getInputBufferBlocks(iBuilder));
    432         kernel::Kernel* twistK = mGrepDriver->addKernelInstance<kernel::P2S4StreamByPDEP>(iBuilder);
     432    size_t numOfStreams = compressedBitStreams[0]->getNumOfStreams();
     433
     434    // 1, 2, 4, 8
     435
     436    if (numOfStreams <= 2) {
     437        StreamSetBuffer* twistedCharClasses = mGrepDriver->addBuffer<StaticBuffer>(iBuilder, iBuilder->getStreamSetTy(1, 2), this->getInputBufferBlocks(iBuilder));
     438        kernel::Kernel* twistK = mGrepDriver->addKernelInstance<kernel::TwistByPDEPKernel>(iBuilder, numOfStreams, 2);
    433439        mGrepDriver->makeKernelCall(twistK, {compressedBitStreams[0]}, {twistedCharClasses});
    434440
    435 
    436         StreamSetBuffer* uncompressedTwistedCharClasses = mGrepDriver->addBuffer<StaticBuffer>(iBuilder, iBuilder->getStreamSetTy(1, 4), this->getInputBufferBlocks(iBuilder));
    437         Kernel* lz4I4AioK = mPxDriver.addKernelInstance<LZ4I4ByteStreamAioKernel>(iBuilder);
     441        StreamSetBuffer* uncompressedTwistedCharClasses = mGrepDriver->addBuffer<StaticBuffer>(iBuilder, iBuilder->getStreamSetTy(1, 2), this->getInputBufferBlocks(iBuilder));
     442        Kernel* lz4I4AioK = mPxDriver.addKernelInstance<LZ4TwistAioKernel>(iBuilder, 2);
    438443        lz4I4AioK->setInitialArguments({mFileSize});
    439444        mGrepDriver->makeKernelCall(lz4I4AioK, {
    … …  
    450455                                    });
    451456
    452         StreamSetBuffer* untwistedCharClasses = mGrepDriver->addBuffer<StaticBuffer>(iBuilder, iBuilder->getStreamSetTy(4), this->getInputBufferBlocks(iBuilder));
    453         kernel::Kernel* untwistK = mGrepDriver->addKernelInstance<kernel::S2P4StreamByPEXTKernel>(iBuilder);
     457        StreamSetBuffer* untwistedCharClasses = mGrepDriver->addBuffer<StaticBuffer>(iBuilder, iBuilder->getStreamSetTy(numOfStreams), this->getInputBufferBlocks(iBuilder));
     458        kernel::Kernel* untwistK = mGrepDriver->addKernelInstance<kernel::UntwistByPEXTKernel>(iBuilder, numOfStreams, 2);
     459        mGrepDriver->makeKernelCall(untwistK, {uncompressedTwistedCharClasses}, {untwistedCharClasses});
     460        return {untwistedCharClasses};
     461    }
     462
     463    if (numOfStreams <= 4) {
     464        StreamSetBuffer* twistedCharClasses = mGrepDriver->addBuffer<StaticBuffer>(iBuilder, iBuilder->getStreamSetTy(1, 4), this->getInputBufferBlocks(iBuilder));
     465        kernel::Kernel* twistK = mGrepDriver->addKernelInstance<kernel::TwistByPDEPKernel>(iBuilder, numOfStreams, 4);
     466        mGrepDriver->makeKernelCall(twistK, {compressedBitStreams[0]}, {twistedCharClasses});
     467
     468
     469        StreamSetBuffer* uncompressedTwistedCharClasses = mGrepDriver->addBuffer<StaticBuffer>(iBuilder, iBuilder->getStreamSetTy(1, 4), this->getInputBufferBlocks(iBuilder));
     470
     471        Kernel* lz4I4AioK = mPxDriver.addKernelInstance<LZ4TwistAioKernel>(iBuilder, 4);
     472        lz4I4AioK->setInitialArguments({mFileSize});
     473        mGrepDriver->makeKernelCall(lz4I4AioK, {
     474                mCompressedByteStream,
     475
     476                // Block Data
     477                BlockData_IsCompressed,
     478                BlockData_BlockStart,
     479                BlockData_BlockEnd,
     480
     481                twistedCharClasses
     482        }, {
     483                                            uncompressedTwistedCharClasses
     484                                    });
     485
     486        StreamSetBuffer* untwistedCharClasses = mGrepDriver->addBuffer<StaticBuffer>(iBuilder, iBuilder->getStreamSetTy(numOfStreams), this->getInputBufferBlocks(iBuilder));
     487        kernel::Kernel* untwistK = mGrepDriver->addKernelInstance<kernel::UntwistByPEXTKernel>(iBuilder, numOfStreams, 4);
    454488        mGrepDriver->makeKernelCall(untwistK, {uncompressedTwistedCharClasses}, {untwistedCharClasses});
    455489        return {untwistedCharClasses};

  • icGREP/icgrep-devel/icgrep/lz4/LZ4GrepGenerator.cpp

    r6133 r6135  
    2222#include <kernels/lz4/lz4_bitstream_match_copy_kernel.h>
    2323#include <kernels/lz4/lz4_bitstream_not_kernel.h>
    24 #include <kernels/lz4/aio/lz4_i4_bytestream_aio.h>
    2524#include <kernels/fake_stream_generating_kernel.h>
    2625#include <kernels/bitstream_pdep_kernel.h>
    … …  
    401400
    402401    StreamSetBuffer * fakeMatchCopiedBits = mPxDriver.addBuffer<StaticBuffer>(idb, idb->getStreamSetTy(8), this->getInputBufferBlocks(idb));
    403     Kernel* fakeStreamGeneratorK = mPxDriver.addKernelInstance<FakeStreamGeneratingKernel>(idb, numOfCharacterClasses, 8);
    404     mPxDriver.makeKernelCall(fakeStreamGeneratorK, {decompressedCharClasses}, {fakeMatchCopiedBits});
     402    StreamSetBuffer * u8NoFinalStream = mPxDriver.addBuffer<StaticBuffer>(idb, idb->getStreamSetTy(1), this->getInputBufferBlocks(idb), 1);
     403
     404    Kernel* fakeStreamGeneratorK = mPxDriver.addKernelInstance<FakeStreamGeneratingKernel>(idb, numOfCharacterClasses, std::vector<unsigned>({8, 1}));
     405    mPxDriver.makeKernelCall(fakeStreamGeneratorK, {decompressedCharClasses}, {fakeMatchCopiedBits, u8NoFinalStream});
    405406
    406407    StreamSetBuffer * LineBreakStream = mPxDriver.addBuffer<StaticBuffer>(idb, idb->getStreamSetTy(1, 1), this->getInputBufferBlocks(idb));
    … …  
    409410
    410411
     412    externalStreamNames.push_back("UTF8_nonfinal");
     413
    411414    kernel::Kernel * icgrepK = mGrepDriver->addKernelInstance<kernel::ICGrepKernel>(idb, mREs[0], externalStreamNames, std::vector<cc::Alphabet *>{mpx.get()}, cc::BitNumbering::BigEndian);
    412     mGrepDriver->makeKernelCall(icgrepK, {fakeMatchCopiedBits, decompressedCharClasses}, {MatchResults});
     415    mGrepDriver->makeKernelCall(icgrepK, {fakeMatchCopiedBits, u8NoFinalStream, decompressedCharClasses}, {MatchResults});
    413416    MatchResultsBufs[0] = MatchResults;
    414417
    … …  
    774777
    775778    // GeneratePipeline
    776     this->generateLoadByteStream(iBuilder);
    777 //    this->generateLoadByteStreamAndBitStream(iBuilder);
     779//    this->generateLoadByteStream(iBuilder);
     780    this->generateLoadByteStreamAndBitStream(iBuilder);
    778781
    779782    parabix::StreamSetBuffer * decompressedByteStream = this->generateAIODecompression(iBuilder);

  • icGREP/icgrep-devel/icgrep/lzparabix/LZParabixGrepGenerator.cpp

    r6133 r6135  
    188188    StreamSetBuffer * const LiteralBitStream = this->extractLiteralBitStream(idb);
    189189
    190     bool allCcByteLength = re::isAllCcByteLength(mREs[0]);
    191 
    192190    mpx = make_unique<cc::MultiplexedAlphabet>("mpx", UnicodeSets);
    193191    mREs[0] = transformCCs(mpx.get(), mREs[0]);
    … …  
    208206    StreamSetBuffer * fakeMatchCopiedBits = nullptr;
    209207
     208
     209    bool allCcByteLength = re::isAllCcByteLength(mREs[0]);
    210210    if (allCcByteLength) {
    211211        auto ret = this->generateBitStreamDecompression(idb, {CharClasses});
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