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Copy pathts2diff_encoder.h
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406 lines (373 loc) · 13.2 KB
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
#ifndef ENCODING_TS2DIFF_ENCODER_H
#define ENCODING_TS2DIFF_ENCODER_H
#include <sys/types.h>
#include "common/allocator/alloc_base.h"
#include "common/allocator/byte_stream.h"
#include "encoder.h"
#if defined(__SSE4_2__)
#include <smmintrin.h>
#define USE_SSE 1
#elif defined(__AVX2__)
#include <immintrin.h>
#define USE_AVX2 1
#endif
namespace storage {
template <typename T>
struct SIMDOps;
template <>
struct SIMDOps<int32_t> {
#ifdef USE_SSE
static void rebase(int32_t* arr, int32_t min_val, size_t size) {
const __m128i min_vec = _mm_set1_epi32(min_val);
size_t i = 0;
for (; i + 3 < size; i += 4) {
__m128i vec =
_mm_loadu_si128(reinterpret_cast<const __m128i*>(arr + i));
vec = _mm_sub_epi32(vec, min_vec);
_mm_storeu_si128(reinterpret_cast<__m128i*>(arr + i), vec);
}
for (; i < size; ++i) {
arr[i] -= min_val;
}
}
#else
static void rebase(int32_t* arr, int32_t min_val, size_t size) {
for (size_t i = 0; i < size; ++i) {
arr[i] -= min_val;
}
}
#endif
};
template <>
struct SIMDOps<int64_t> {
#ifdef USE_AVX2
static void rebase(int64_t* arr, int64_t min_val, size_t size) {
const __m256i min_vec = _mm256_set1_epi64x(min_val);
size_t i = 0;
for (; i + 3 < size; i += 4) {
__m256i vec =
_mm256_loadu_si256(reinterpret_cast<const __m256i*>(arr + i));
vec = _mm256_sub_epi64(vec, min_vec);
_mm256_storeu_si256(reinterpret_cast<__m256i*>(arr + i), vec);
}
for (; i < size; ++i) {
arr[i] -= min_val;
}
}
#else
static void rebase(int64_t* arr, int64_t min_val, size_t size) {
for (size_t i = 0; i < size; ++i) {
arr[i] -= min_val;
}
}
#endif
};
template <typename T>
class TS2DIFFEncoder : public Encoder {
public:
TS2DIFFEncoder() { init(); }
~TS2DIFFEncoder() {}
void reset() { write_index_ = -1; }
void init() {
block_size_ = 128;
// block_size_ = 16;
delta_arr_ = (T*)common::mem_alloc(sizeof(T) * block_size_,
common::MOD_TS2DIFF_OBJ);
write_index_ = -1;
bits_left_ = 8;
buffer_ = 0;
delta_arr_min_ = 0;
delta_arr_max_ = 0;
first_value_ = 0;
previous_value_ = 0;
}
void destroy() {
if (delta_arr_ != nullptr) {
common::mem_free(delta_arr_);
delta_arr_ = nullptr;
}
}
void write_bits(int64_t value, int bits, common::ByteStream& out_stream) {
while (bits > 0) {
int shift = bits - bits_left_;
if (shift >= 0) {
buffer_ |=
(uint8_t)((value >> shift) & ((1 << bits_left_) - 1));
bits -= bits_left_;
bits_left_ = 0;
} else {
shift = bits_left_ - bits;
buffer_ |= (uint8_t)(value << shift);
bits_left_ -= bits;
bits = 0;
}
flush_byte_if_full(out_stream);
}
}
void flush_remaining(common::ByteStream& out_stream) {
// FIXME bits_left_ != 0 does not means something to be flushed. (=8)
if (bits_left_ != 0 && bits_left_ != 8) {
bits_left_ = 0;
flush_byte_if_full(out_stream);
}
}
void flush_byte_if_full(common::ByteStream& out_stream) {
if (bits_left_ == 0) {
out_stream.write_buf(&buffer_, 1);
buffer_ = 0;
bits_left_ = 8;
}
}
void rebase_arr(int i) { delta_arr_[i] = delta_arr_[i] - delta_arr_min_; }
int cal_bit_width(T n) {
int bit_width = 0;
while (n > 0) {
bit_width++;
n >>= 1;
}
return bit_width;
}
int do_encode(T value, common::ByteStream& out_stream);
int encode(bool value, common::ByteStream& out_stream);
int encode(int32_t value, common::ByteStream& out_stream);
int encode(int64_t value, common::ByteStream& out_stream);
int encode(float value, common::ByteStream& out_stream);
int encode(double value, common::ByteStream& out_stream);
int encode(common::String value, common::ByteStream& out_stream);
int flush(common::ByteStream& out_stream);
int get_max_byte_size() {
// The meaning of 24 is: index(4)+width(4)+minDeltaBase(8)+firstValue(8)
return 24 + write_index_ * 8;
}
public:
int block_size_;
T* delta_arr_;
T first_value_;
T previous_value_;
T delta_arr_min_;
T delta_arr_max_;
uint8_t buffer_;
int bits_left_;
int write_index_;
};
template <typename T>
int TS2DIFFEncoder<T>::do_encode(T value, common::ByteStream& out_stream) {
if (write_index_ == -1) {
first_value_ = value;
previous_value_ = first_value_;
write_index_++;
return common::E_OK;
}
// Calculate the delta between the current value and the previous_value_
T delta = value - previous_value_;
previous_value_ = value;
if (write_index_ == 0) {
delta_arr_max_ = delta;
delta_arr_min_ = delta;
}
if (delta > delta_arr_max_) {
delta_arr_max_ = delta;
}
if (delta < delta_arr_min_) {
delta_arr_min_ = delta;
}
delta_arr_[write_index_] = delta;
write_index_++;
if (write_index_ >= block_size_) {
return flush(out_stream);
}
return common::E_OK;
}
template <>
inline int TS2DIFFEncoder<int32_t>::flush(common::ByteStream& out_stream) {
int ret = common::E_OK;
if (write_index_ == -1) {
return common::E_OK;
}
// Subtract the minimum value for each delta_arr_ item
SIMDOps<int32_t>::rebase(delta_arr_, delta_arr_min_, write_index_);
// Calculate the bit length of each value to writer
int bit_width = cal_bit_width(delta_arr_max_ - delta_arr_min_);
// writer header
common::SerializationUtil::write_ui32(write_index_, out_stream);
common::SerializationUtil::write_ui32(bit_width, out_stream);
common::SerializationUtil::write_ui32(delta_arr_min_, out_stream);
common::SerializationUtil::write_ui32(first_value_, out_stream);
// writer data
for (int i = 0; i < write_index_; i++) {
write_bits(delta_arr_[i], bit_width, out_stream);
}
flush_remaining(out_stream);
reset();
return ret;
}
template <>
inline int TS2DIFFEncoder<int64_t>::flush(common::ByteStream& out_stream) {
int ret = common::E_OK;
if (write_index_ == -1) {
return common::E_OK;
}
// Subtract the minimum value for each delta_arr_ item
SIMDOps<int64_t>::rebase(delta_arr_, delta_arr_min_, write_index_);
// Calculate the bit length of each value to writer
int bit_width = cal_bit_width(delta_arr_max_ - delta_arr_min_);
// writer header
common::SerializationUtil::write_i32(write_index_, out_stream);
common::SerializationUtil::write_i32(bit_width, out_stream);
common::SerializationUtil::write_i64(delta_arr_min_, out_stream);
common::SerializationUtil::write_i64(first_value_, out_stream);
// writer data
for (int i = 0; i < write_index_; i++) {
write_bits(delta_arr_[i], bit_width, out_stream);
}
flush_remaining(out_stream);
reset(); // 语义，writeIndex=-1;
return ret;
}
class FloatTS2DIFFEncoder : public TS2DIFFEncoder<int32_t> {
public:
int do_encode(float value, common::ByteStream& out_stream) {
int32_t value_int = common::float_to_int(value);
return TS2DIFFEncoder<int32_t>::do_encode(value_int, out_stream);
}
int encode(bool value, common::ByteStream& out_stream);
int encode(int32_t value, common::ByteStream& out_stream);
int encode(int64_t value, common::ByteStream& out_stream);
int encode(float value, common::ByteStream& out_stream);
int encode(double value, common::ByteStream& out_stream);
};
class DoubleTS2DIFFEncoder : public TS2DIFFEncoder<int64_t> {
public:
int do_encode(double value, common::ByteStream& out_stream) {
int64_t value_long = common::double_to_long(value);
return TS2DIFFEncoder<int64_t>::do_encode(value_long, out_stream);
}
int encode(bool value, common::ByteStream& out_stream);
int encode(int32_t value, common::ByteStream& out_stream);
int encode(int64_t value, common::ByteStream& out_stream);
int encode(float value, common::ByteStream& out_stream);
int encode(double value, common::ByteStream& out_stream);
};
typedef TS2DIFFEncoder<int32_t> IntTS2DIFFEncoder;
typedef TS2DIFFEncoder<int64_t> LongTS2DIFFEncoder;
// wrap as Encoder
template <>
FORCE_INLINE int IntTS2DIFFEncoder::encode(bool value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
template <>
FORCE_INLINE int IntTS2DIFFEncoder::encode(int32_t value,
common::ByteStream& out) {
return do_encode(value, out);
}
template <>
FORCE_INLINE int IntTS2DIFFEncoder::encode(int64_t value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
template <>
FORCE_INLINE int IntTS2DIFFEncoder::encode(float value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
template <>
FORCE_INLINE int IntTS2DIFFEncoder::encode(double value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
template <>
FORCE_INLINE int IntTS2DIFFEncoder::encode(common::String value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
template <>
FORCE_INLINE int LongTS2DIFFEncoder::encode(bool value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
template <>
FORCE_INLINE int LongTS2DIFFEncoder::encode(int32_t value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
template <>
FORCE_INLINE int LongTS2DIFFEncoder::encode(int64_t value,
common::ByteStream& out) {
return do_encode(value, out);
}
template <>
FORCE_INLINE int LongTS2DIFFEncoder::encode(float value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
template <>
FORCE_INLINE int LongTS2DIFFEncoder::encode(double value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
template <>
FORCE_INLINE int LongTS2DIFFEncoder::encode(common::String value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
FORCE_INLINE int FloatTS2DIFFEncoder::encode(bool value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
FORCE_INLINE int FloatTS2DIFFEncoder::encode(int32_t value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
FORCE_INLINE int FloatTS2DIFFEncoder::encode(int64_t value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
FORCE_INLINE int FloatTS2DIFFEncoder::encode(float value,
common::ByteStream& out) {
return do_encode(value, out);
}
FORCE_INLINE int FloatTS2DIFFEncoder::encode(double value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
FORCE_INLINE int DoubleTS2DIFFEncoder::encode(bool value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
FORCE_INLINE int DoubleTS2DIFFEncoder::encode(int32_t value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
FORCE_INLINE int DoubleTS2DIFFEncoder::encode(int64_t value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
FORCE_INLINE int DoubleTS2DIFFEncoder::encode(float value,
common::ByteStream& out) {
return common::E_TYPE_NOT_MATCH;
}
FORCE_INLINE int DoubleTS2DIFFEncoder::encode(double value,
common::ByteStream& out) {
return do_encode(value, out);
}
} // end namespace storage
#endif // ENCODING_TS2DIFF_ENCODER_H