// Copyright (c) 2021-2024, Intel Corporation
// SPDX-License-Identifier: BSD-3-Clause

#include <benchmark/benchmark.h>
#include <cstdint>
#include <stdio.h>

#include "../common.h"
#include "02_soaaos_ispc.h"

static Docs docs("soa_to_aos*_stdlib_<type> - test for stdlib implimentation for different types\n"
                 "soa_to_aos*_ispc_<type> - test for ISPC implementation of these library functions.\n"
                 "Expectations:\n"
                 " - stdlib functions have the same speed for float vs int32 and double vs int64.\n"
                 " - stdlib implementation is faster or has same performance as ISPC implementation.\n"
                 "TODO:\n"
                 " - ISPC source code implementation.\n");

WARM_UP_RUN();

// Minimum size is maximum target width * 4, i.e. 64*4 = 256.
// 256 * sizeof (int) = 1kb - expected to reside in L1
// 256 * sizeof (int) << 4 = 16kb - expected to reside in L1
// 256 * sizeof (int) << 7 = 128kb - expected to reside in L2
// 256 * sizeof (int) << 12 = 4 Mb - expected to reside in L3.
#define ARGS4 Arg(256)->Arg(256 << 4)->Arg(256 << 7)->Arg(256 << 12)
#define ARGS3 Arg(192)->Arg(192 << 4)->Arg(192 << 7)->Arg(192 << 12)
#define ARGS2 Arg(128)->Arg(128 << 4)->Arg(128 << 7)->Arg(128 << 12)

// Helper functions
template <typename T> static void init(T *src, T *dst, int factor, int count) {
    int width = ispc::width();
    int chunk = width * factor;
    for (int i = 0; i < count; i++) {
        int base = (i / chunk) * chunk;
        int in_chunk = i % chunk;
        int vec_num = in_chunk / width;
        int in_vec = in_chunk % width;
        int value = base + in_vec * factor + vec_num;
        src[i] = static_cast<T>(value);
        dst[i] = 0;
    }
}

template <typename T> static void check(T *dst, int count) {
    for (int i = 0; i < count; i++) {
        // Note, we use == comparison even for floating point types, as we expect that
        // values are only copied, but not manipulated in any other way.
        if (dst[i] != static_cast<T>(i)) {
            printf("Error i=%d, expected %d, returned %d\n", i, i, static_cast<int>(dst[i]));
            return;
        }
    }
}

#define SOA_TO_AOS_STDLIB(N, T_C, T_ISPC)                                                                              \
    static void soa_to_aos##N##_stdlib_##T_ISPC(benchmark::State &state) {                                             \
        int count = static_cast<int>(state.range(0));                                                                  \
        T_C *src = static_cast<T_C *>(aligned_alloc_helper(sizeof(T_C) * count));                                      \
        T_C *dst = static_cast<T_C *>(aligned_alloc_helper(sizeof(T_C) * count));                                      \
        init(src, dst, N, count);                                                                                      \
                                                                                                                       \
        for (auto _ : state) {                                                                                         \
            ispc::soa_to_aos##N##_stdlib_##T_ISPC(src, dst, count);                                                    \
        }                                                                                                              \
                                                                                                                       \
        check(dst, count);                                                                                             \
        aligned_free_helper(src);                                                                                      \
        aligned_free_helper(dst);                                                                                      \
    }                                                                                                                  \
    BENCHMARK(soa_to_aos##N##_stdlib_##T_ISPC)->ARGS##N;

#define SOA_TO_AOS_ISPC(N, T_C, T_ISPC)                                                                                \
    static void soa_to_aos##N##_ispc_##T_ISPC(benchmark::State &state) {                                               \
        int count = static_cast<int>(state.range(0));                                                                  \
        T_C *src = static_cast<T_C *>(aligned_alloc_helper(sizeof(T_C) * count));                                      \
        T_C *dst = static_cast<T_C *>(aligned_alloc_helper(sizeof(T_C) * count));                                      \
        init(src, dst, count);                                                                                         \
                                                                                                                       \
        for (auto _ : state) {                                                                                         \
            ispc::soa_to_aos##N##_ispc_##T_ISPC(src, dst, count);                                                      \
        }                                                                                                              \
                                                                                                                       \
        check##N(dst, count);                                                                                          \
        aligned_free_helper(src);                                                                                      \
        aligned_free_helper(dst);                                                                                      \
    }                                                                                                                  \
    BENCHMARK(soa_to_aos##N##_ispc_##T_ISPC)->ARGS##N;

SOA_TO_AOS_STDLIB(4, int, int32);
SOA_TO_AOS_STDLIB(4, float, float);
SOA_TO_AOS_STDLIB(4, int64_t, int64);
SOA_TO_AOS_STDLIB(4, double, double);

// SOA_TO_AOS_ISPC(4, int, int32);
// SOA_TO_AOS_ISPC(4, float, float);
// SOA_TO_AOS_ISPC(4, int64_t, int64);
// SOA_TO_AOS_ISPC(4, double, double);

SOA_TO_AOS_STDLIB(3, int, int32);
SOA_TO_AOS_STDLIB(3, float, float);
SOA_TO_AOS_STDLIB(3, int64_t, int64);
SOA_TO_AOS_STDLIB(3, double, double);

// SOA_TO_AOS_ISPC(3, int, int32);
// SOA_TO_AOS_ISPC(3, float, float);
// SOA_TO_AOS_ISPC(3, int64_t, int64);
// SOA_TO_AOS_ISPC(3, double, double);

SOA_TO_AOS_STDLIB(2, int, int32);
SOA_TO_AOS_STDLIB(2, float, float);
SOA_TO_AOS_STDLIB(2, int64_t, int64);
SOA_TO_AOS_STDLIB(2, double, double);

BENCHMARK_MAIN();
