#ifndef BMCONST__H__INCLUDED__
#define BMCONST__H__INCLUDED__
/*
Copyright(c) 2002-2025 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)

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.

For more information please visit:  http://bitmagic.io
*/

/*! \file bmconst.h
    \brief Constants, lookup tables and typedefs
    @internal
*/

#include <cstdint>
#include <inttypes.h>

namespace bm
{

#if defined(_WIN32) || defined (_WIN64)
typedef unsigned __int64 id64_t;
#else
typedef unsigned long long int id64_t;
#endif

typedef unsigned int   id_t;
typedef unsigned int   word_t;
typedef unsigned short short_t;

#ifndef BM_DEFAULT_POOL_SIZE
# define BM_DEFAULT_POOL_SIZE 4096
#endif

#ifdef BM64ADDR
const unsigned long long id_max32 = 0xFFFFFFFFull;
const unsigned long long id_max48 = 0xFFFFFFFFFFFFull;
#else
const unsigned id_max32 = 0xFFFFFFFFu;
#endif

// Data Block parameters

const unsigned set_block_size  = 2048u;
const unsigned set_block_shift = 16u;
const unsigned set_block_mask  = 0xFFFFu;
const unsigned set_blkblk_mask = 0xFFFFFFu;

// set block size in bytes
const unsigned set_block_alloc_size = bm::set_block_size * unsigned(sizeof(bm::word_t));

const unsigned set_block_plane_size = bm::set_block_size / 32u;
const unsigned set_block_plane_cnt = (unsigned)(sizeof(bm::word_t) * 8u);

const unsigned block_waves = 64;
const unsigned set_block_digest_wave_size = bm::set_block_size / bm::block_waves;
const unsigned set_block_digest_pos_shift = 10;

// Word parameters

const unsigned set_word_shift = 5u;
const unsigned set_word_mask  = 0x1Fu;


// GAP related parameters.

typedef unsigned short gap_word_t;

const unsigned gap_max_buff_len = 1280;
const unsigned gap_max_safe_len = 8189; 
const unsigned gap_max_bits = 65536;
const unsigned gap_equiv_len = (unsigned)
   ((sizeof(bm::word_t) * bm::set_block_size) / sizeof(bm::gap_word_t));
const unsigned gap_max_bits_cmrz = bm::gap_max_bits / 2;
const unsigned gap_levels = 4;
const unsigned gap_max_level = bm::gap_levels - 1;

const unsigned bie_cut_off = 16384; // binary interpolative encode size cut-off


// Block Array parameters


const unsigned set_array_size32 = 256u;
const unsigned set_sub_array_size = set_array_size32;
const unsigned set_array_shift = 8u;
const unsigned set_array_mask  = 0xFFu;

const unsigned set_total_blocks32 = (bm::set_array_size32 * bm::set_array_size32);
const unsigned set_sub_total_bits = bm::set_sub_array_size * bm::gap_max_bits;

#ifdef BM64ADDR
const unsigned set_total_blocks48 = bm::id_max48 / bm::gap_max_bits;
const unsigned long long id_max = bm::id_max48;
const unsigned long long set_array_size48 = 1 + (bm::id_max48 / set_sub_total_bits);
const unsigned  set_top_array_size = bm::set_array_size48;
const id64_t set_total_blocks = id64_t(bm::set_top_array_size) * set_sub_array_size;
#else
const unsigned id_max = bm::id_max32;
const unsigned set_top_array_size = bm::set_array_size32;
const unsigned set_total_blocks = bm::set_total_blocks32;
#endif

const unsigned bits_in_block = bm::set_block_size * unsigned((sizeof(bm::word_t) * 8));
const unsigned bits_in_array = bm::bits_in_block * bm::set_array_size32;


// Rank-Select parameters (linear address to split the searches
const unsigned rs3_border0 = 21824; // 682 words by 32-bits
const unsigned rs3_border1 = (rs3_border0 * 2); // 43648
const unsigned rs3_half_span = rs3_border0 / 2;
const unsigned rs3_border0_1 = rs3_border0 + rs3_half_span; // intermed pnt 1
const unsigned rs3_border1_1 = rs3_border1 + rs3_half_span; // intermed pnt 2

// misc parameters for sparse vec algorithms
//const unsigned sub_bfind_block_cnt = 32; // bfind discretization factor
//const unsigned sub_block_l1_size =
//        bm::gap_max_bits / bm::sub_bfind_block_cnt; // size in bits/elements

#if defined(BM64OPT) || defined(BM64_SSE4)
typedef id64_t  wordop_t;
const id64_t    all_bits_mask = 0xffffffffffffffffULL;
const unsigned set_block_size_op  = bm::set_block_size / 2;
#else
typedef word_t wordop_t;
const word_t all_bits_mask = 0xffffffff;
const unsigned set_block_size_op  = bm::set_block_size;
#endif


/*!
   @brief Block allocation strategies.
   @ingroup bvector
*/
enum strategy
{
    BM_BIT = 0, //!< No GAP compression strategy. All new blocks are bit blocks.
    BM_GAP = 1  //!< GAP compression is ON.
};

/*!
   @brief copy strategy
   @ingroup bvector
*/
enum class finalization
{
    UNDEFINED = 0,
    READONLY = 1,   //!<  immutable (read-only object)
    READWRITE = 2,  //!<  mutable (read-write object)
};


/**
    Codes of set operations
    @ingroup bvector
*/
enum set_operation
{
    set_AND         = 0,
    set_OR          = 1,
    set_SUB         = 2,
    set_XOR         = 3,
    set_ASSIGN      = 4,
    set_COUNT       = 5,
    set_COUNT_AND   = 6,
    set_COUNT_XOR   = 7,
    set_COUNT_OR    = 8,
    set_COUNT_SUB_AB= 9,
    set_COUNT_SUB_BA= 10,
    set_COUNT_A     = 11,
    set_COUNT_B     = 12,

    set_END
};

/**
    Bit operations
    @ingroup bvector
*/
enum operation
{
    BM_AND = bm::set_AND,
    BM_OR  = bm::set_OR,
    BM_SUB = bm::set_SUB,
    BM_XOR = bm::set_XOR
};


/*!
   @brief Sort order declaration
   @ingroup bvector
*/
enum sort_order
{
    BM_UNSORTED       = 0,  //!< input set is NOT sorted
    BM_SORTED         = 1,  //!< input set is sorted (ascending order)
    BM_SORTED_UNIFORM = 2,  //!< sorted and in one block (internal!)
    BM_UNKNOWN        = 3   //!< sort order unknown
};


/*!
    @brief set representation variants
    @internal
*/
enum class set_representation
{
    set_bitset  = 0,  //!< Simple bitset
    set_gap     = 1,  //!< GAP-RLE compression
    set_array1  = 2,  //!< array of set 1 values
    set_array0  = 3   //!< array of 0 values
};

/*!
   @brief NULL-able value support
   @ingroup bvector
*/
enum null_support
{
    use_null = 0, //!< support "non-assigned" or "NULL" logic
    no_null  = 1   //!< do not support NULL values
};


/**
    Internal structure. Copyright information.
    @internal
*/
template<bool T> struct _copyright
{
    static const char _p[]; ///< Version as a text
    static const unsigned _v[3]; ///< MAJOR.MINOR.PATCH version components
};

#define BM_VERSION_MAJOR 8
#define BM_VERSION_MINOR 0
#define BM_VERSION_PATCH 1

template<bool T> const char _copyright<T>::_p[] = 
    "BitMagic Library. v.8.0.1 (c) 2002-2025 Anatoliy Kuznetsov.";
template<bool T> const unsigned _copyright<T>::_v[3] =
                    { BM_VERSION_MAJOR, BM_VERSION_MINOR, BM_VERSION_PATCH };

#define BM_SCALAR_VERSION (((BM_VERSION_MAJOR) << 16) + ((BM_VERSION_MINOR) << 8) + (BM_VERSION_PATCH))


/**
    DeBruijn majic table
    @internal
*/
template<bool T> struct DeBruijn_bit_position
{
    static const unsigned _multiply[32];
};

template<bool T>
const unsigned DeBruijn_bit_position<T>::_multiply[32] = { 
  0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8, 
  31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9
};

/**
    Structure keeps index of first right 1 bit for every byte.
    @ingroup bitfunc 
*/
template<bool T> struct first_bit_table
{
    static const signed char _idx[256];
};

template<bool T>
const signed char first_bit_table<T>::_idx[256] = {
  -1, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
    5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
    5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
};

//---------------------------------------------------------------------

/** Structure to aid in counting bits
    table contains count of bits in 0-255 diapason of numbers

   @ingroup bitfunc
*/
template<bool T> struct bit_count_table 
{
  static const unsigned char _count[256];
};

template<bool T>
const unsigned char bit_count_table<T>::_count[256] = {
    0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
    1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
    1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
    2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
    1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
    2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
    2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
    3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
};

//---------------------------------------------------------------------

/** Structure for LZCNT constants (4-bit)
    @ingroup bitfunc
*/
template<bool T> struct lzcnt_table
{
    static unsigned char const _lut[16];
};

template<bool T>
const unsigned char lzcnt_table<T>::_lut[16] = 
{
    32U, 31U, 30U, 30U, 29U, 29U, 29U, 29U,
    28U, 28U, 28U, 28U, 28U, 28U, 28U, 28U
};

/** Structure for TZCNT constants 
    @ingroup bitfunc
*/
template<bool T> struct tzcnt_table
{
    static unsigned char const _lut[37];
};

template<bool T>
const unsigned char tzcnt_table<T>::_lut[37] =
{ 
    32, 0, 1, 26, 2, 23, 27, 0, 3, 16, 24, 30, 28, 11,
    0, 13, 4, 7, 17, 0, 25, 22, 31, 15, 29, 10, 12, 6, 0, 
    21, 14, 9, 5, 20, 8, 19, 18 
};



/** Structure keeps all-left/right ON bits masks. 
    @ingroup bitfunc 
*/
template<bool T> struct block_set_table
{
    static const unsigned _left[32];
    static const unsigned _right[32];
};

template<bool T>
const unsigned block_set_table<T>::_left[32] = {
    0x1, 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff, 0x7ff,
    0xfff, 0x1fff, 0x3fff, 0x7fff, 0xffff, 0x1ffff, 0x3ffff, 0x7ffff,
    0xfffff, 0x1fffff, 0x3fffff, 0x7fffff, 0xffffff, 0x1ffffff, 0x3ffffff,
    0x7ffffff, 0xfffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff, 0xffffffff
};

template<bool T>
const unsigned block_set_table<T>::_right[32] = {
    0xffffffff, 0xfffffffe, 0xfffffffc, 0xfffffff8, 0xfffffff0,
    0xffffffe0, 0xffffffc0, 0xffffff80, 0xffffff00, 0xfffffe00,
    0xfffffc00, 0xfffff800, 0xfffff000, 0xffffe000, 0xffffc000,
    0xffff8000, 0xffff0000, 0xfffe0000, 0xfffc0000, 0xfff80000,
    0xfff00000, 0xffe00000, 0xffc00000, 0xff800000, 0xff000000,
    0xfe000000, 0xfc000000, 0xf8000000, 0xf0000000, 0xe0000000,
    0xc0000000, 0x80000000
};

//---------------------------------------------------------------------



/*! @brief Default GAP lengths table.
    @ingroup gapfunc
*/
template<bool T> struct gap_len_table
{
    static const gap_word_t _len[bm::gap_levels];
};

template<bool T>
const gap_word_t gap_len_table<T>::_len[bm::gap_levels] = 
                { 128, 256, 512, bm::gap_max_buff_len }; 


/*! @brief Alternative GAP lengths table. 
    Good for for memory saver mode and very sparse bitsets.

    @ingroup gapfunc
*/
template<bool T> struct gap_len_table_min
{
    static const gap_word_t _len[bm::gap_levels];
};

template<bool T>
const gap_word_t gap_len_table_min<T>::_len[bm::gap_levels] = 
                                { 32, 96, 128, 512 }; 


/*! @brief Non-linear size growth GAP lengths table.
    @ingroup gapfunc
*/
template<bool T> struct gap_len_table_nl
{
    static const gap_word_t _len[bm::gap_levels];
};

template<bool T>
const gap_word_t gap_len_table_nl<T>::_len[bm::gap_levels] =
                { 32, 128, 512, bm::gap_max_buff_len };

/*!
    @brief codes for supported SIMD optimizations
*/
enum simd_codes
{
    simd_none  = 0,   ///!< No SIMD or any other optimization
    simd_sse2  = 1,   ///!< Intel SSE2
    simd_sse42 = 2,   ///!< Intel SSE4.2
    simd_avx2  = 5,   ///!< Intel AVX2
    simd_avx512  = 6,  ///!< Intel AVX512
    simd_wasm128 = 7,  ///! WASM SIMD 128
    simd_neon = 8      ///!< ARM Neon
};


/*!
   \brief Byte orders recognized by the library.
   @internal
*/
enum ByteOrder
{
    BigEndian    = 0,
    LittleEndian = 1
};

/**
    Internal structure. Different global settings.
    @internal
*/
template<bool T> struct globals
{
    struct bo
    {
        ByteOrder  _byte_order;

        bo()
        {
            unsigned x;
            unsigned char *s = (unsigned char *)&x;
            s[0] = 1; s[1] = 2; s[2] = 3; s[3] = 4;
            if(x == 0x04030201)
            {
                _byte_order = LittleEndian;
                return;
            }
            if(x == 0x01020304)
            {
                _byte_order = BigEndian;
                return;
            }
            _byte_order = LittleEndian;
        }
    };

    static bo  _bo;
    static ByteOrder byte_order() { return _bo._byte_order; }
};
template<bool T> typename globals<T>::bo globals<T>::_bo;



} // namespace

#endif

