hls_max_template/sources/modules/max.hpp

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/*
* Copyright © 2021 "DrasLorus"
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this
* file and associated documentation files (the Software),
* to deal in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _MAX_TEMPLATE_HPP_
#define _MAX_TEMPLATE_HPP_ 1
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#ifdef _MAX_IS_TOP_
uint16_t do_max_redx_64(const uint16_t in_array[64]);
uint16_t do_max_tail_64(const uint16_t in_array[64]);
uint16_t do_max_head_64(const uint16_t in_array[64]);
uint16_t do_max_loop_64(const uint16_t in_array[64]);
uint16_t do_max_redx_127(const uint16_t in_array[64]);
uint16_t do_max_tail_127(const uint16_t in_array[64]);
uint16_t do_max_head_127(const uint16_t in_array[64]);
uint16_t do_max_loop_127(const uint16_t in_array[64]);
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#endif
template <typename T>
constexpr T max_scalar(T a, T b) {
return (a < b ? b : a);
}
template <unsigned N>
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struct max_pow2 {
template <typename T>
static T process(const T values[N]) {
static_assert(N > 2, "N cannot be less than 3!");
return max_scalar(max_pow2<N / 2>::process(values), max_pow2<N / 2>::process(values + N / 2));
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}
};
template <>
struct max_pow2<2> {
template <typename T>
static T process(const T values[2]) {
return max_scalar(values[0], values[1]);
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}
};
template <unsigned N>
struct max_naif {
template <typename T>
static T process(const T values[N]) {
T res = values[0];
for(uint8_t i = 1; i < N; i++){
#pragma HLS pipeline
res = max_scalar(res, values[i]);
}
return res;
}
};
/* TRUE MAX TEMPLATE BELOW */
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/**
* @brief Defines supported schedules
*
*/
typedef enum {
REDUCED,
LOOPED,
TAILED,
HEADED
} max_type_t;
/* REDUCED *****************/
/**
* @brief Recursive template to implement a completely reduced scheduling
*
* @tparam N Input size
* @tparam bEven True if N is even, false otherwise.
* Can use the Macro IS_EVEN()
*/
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template <unsigned N, bool bEven>
class max_reduced {
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public:
template <typename T>
static T process(const T values[N]);
};
/* REDUCED when N is even */
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template <unsigned N>
class max_reduced<N, true> {
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private:
static constexpr unsigned half = N >> 1;
public:
template <typename T>
static T process(const T values[N]);
};
/* REDUCED when N is odd */
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template <unsigned N>
class max_reduced<N, false> {
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private:
static constexpr unsigned Nm1 = N - 1;
static constexpr unsigned half = (Nm1 >> 1);
static constexpr unsigned halfp1 = half + 1;
public:
template <typename T>
static T process(const T values[N]);
};
template <>
class max_reduced<1, false> {
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public:
template <typename T>
static T process(const T values[1]) {
return values[0];
}
};
template <>
class max_reduced<2, true> {
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public:
template <typename T>
static T process(const T values[2]) {
return (values[0] < values[1] ? values[1] : values[0]);
}
};
template <>
class max_reduced<3, false> {
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public:
template <typename T>
static T process(const T values[3]) {
const T max2 = (values[0] < values[1] ? values[1] : values[0]);
return (values[2] < max2 ? max2 : values[2]);
}
};
#define IS_EVEN(N) (((N >> 1) << 1) == N)
template <unsigned N>
template <typename T>
T max_reduced<N, true>::process(const T values[N]) {
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static_assert(N > 2, "N cannot be less than 3!");
T half_values[half];
loop_redx_max:
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for (uint8_t i = 0; i < half; i++) {
const uint8_t j = i << 1;
const uint8_t jp1 = j + 1;
half_values[i] = (values[j] < values[jp1] ? values[jp1] : values[j]);
}
return max_reduced<half, IS_EVEN(half)>::process(half_values);
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}
template <unsigned N>
template <typename T>
T max_reduced<N, false>::process(const T values[N]) {
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static_assert(N > 3, "N cannot be less than 3!");
T half_values[halfp1];
#pragma HLS array_partition variable=half_values complete
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for (uint8_t i = 0; i < half; i++) {
#pragma HLS unroll
const uint8_t j = i << 1;
const uint8_t jp1 = j + 1;
half_values[i] = (values[j] < values[jp1] ? values[jp1] : values[j]);
}
half_values[half] = values[Nm1];
return max_reduced<halfp1, IS_EVEN(halfp1)>::process(half_values);
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}
/**
* @brief User friendly max template
*
* @tparam N Input Size
* @tparam Ver Schedule wanted. Default: REDUCED
*/
template <unsigned N, max_type_t Ver = REDUCED>
class max_template : public max_reduced<N, IS_EVEN(N)> {
};
template <>
class max_template<1, TAILED> {
public:
template <typename T>
static T process(const T values[1]) {
return values[0];
}
};
template <>
class max_template<2, TAILED> {
public:
template <typename T>
static T process(const T values[2]) {
return (values[0] < values[1] ? values[1] : values[0]);
}
};
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template <unsigned N>
class max_template<N, TAILED> {
private:
static constexpr unsigned Nm1 = N - 1;
public:
template <typename T>
static T process(const T values[N]) {
const T max_Nm1 = max_template<Nm1, TAILED>::process(values);
return (max_Nm1 < values[Nm1] ? values[Nm1] : max_Nm1);
}
};
template <>
class max_template<1, HEADED> {
public:
template <typename T>
static T process(const T values[1]) {
return values[0];
}
};
template <>
class max_template<2, HEADED> {
public:
template <typename T>
static T process(const T values[2]) {
return (values[0] < values[1] ? values[1] : values[0]);
}
};
template <unsigned N>
class max_template<N, HEADED> {
private:
static constexpr unsigned Nm1 = N - 1;
public:
template <typename T>
static T process(const T values[N]) {
const T max_Nm1 = max_template<Nm1, HEADED>::process(values + 1);
return (max_Nm1 < values[0] ? values[0] : max_Nm1);
}
};
template <unsigned N>
class max_template<N, LOOPED> {
public:
template <typename T>
static T process(const T values[N]) {
T max_value = values[0];
loop_max:
for (unsigned u = 1; u < N; u++) {
const T value = values[u];
max_value = (max_value < value ? value : max_value);
}
return max_value;
}
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};
#undef IS_EVEN
#endif // _MAX_TEMPLATE_HPP_