/* -*- c++ -*- */
/*
 * Copyright 2015 Free Software Foundation, Inc.
 *
 * This file is part of VOLK
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

/*
 * This puppet is for VOLK tests only.
 * For documentation see 'kernels/volk/volk_32f_8u_polarbutterfly_32f.h'
 */

#ifndef VOLK_KERNELS_VOLK_VOLK_32F_8U_POLARBUTTERFLYPUPPET_32F_H_
#define VOLK_KERNELS_VOLK_VOLK_32F_8U_POLARBUTTERFLYPUPPET_32F_H_

#include <volk/volk_32f_8u_polarbutterfly_32f.h>
#include <volk/volk_8u_x3_encodepolar_8u_x2.h>
#include <volk/volk_8u_x3_encodepolarpuppet_8u.h>


static inline void sanitize_bytes(unsigned char* u, const int elements)
{
    int i;
    unsigned char* u_ptr = u;
    for (i = 0; i < elements; i++) {
        *u_ptr = (*u_ptr & 0x01);
        u_ptr++;
    }
}

static inline void clean_up_intermediate_values(float* llrs,
                                                unsigned char* u,
                                                const int frame_size,
                                                const int elements)
{
    memset(u + frame_size, 0, sizeof(unsigned char) * (elements - frame_size));
    memset(llrs + frame_size, 0, sizeof(float) * (elements - frame_size));
}

static inline void
generate_error_free_input_vector(float* llrs, unsigned char* u, const int frame_size)
{
    memset(u, 0, frame_size);
    unsigned char* target = u + frame_size;
    volk_8u_x2_encodeframepolar_8u_generic(target, u + 2 * frame_size, frame_size);
    float* ft = llrs;
    int i;
    for (i = 0; i < frame_size; i++) {
        *ft = (-2 * ((float)*target++)) + 1.0f;
        ft++;
    }
}

static inline void
print_llr_tree(const float* llrs, const int frame_size, const int frame_exp)
{
    int s, e;
    for (s = 0; s < frame_size; s++) {
        for (e = 0; e < frame_exp + 1; e++) {
            printf("%+4.2f ", llrs[e * frame_size + s]);
        }
        printf("\n");
        if ((s + 1) % 8 == 0) {
            printf("\n");
        }
    }
}

static inline int maximum_frame_size(const int elements)
{
    unsigned int frame_size = next_lower_power_of_two(elements);
    unsigned int frame_exp = log2_of_power_of_2(frame_size);
    return next_lower_power_of_two(frame_size / frame_exp);
}

#ifdef LV_HAVE_GENERIC
static inline void volk_32f_8u_polarbutterflypuppet_32f_generic(float* llrs,
                                                                const float* input,
                                                                unsigned char* u,
                                                                const int elements)
{
    unsigned int frame_size = maximum_frame_size(elements);
    unsigned int frame_exp = log2_of_power_of_2(frame_size);

    sanitize_bytes(u, elements);
    clean_up_intermediate_values(llrs, u, frame_size, elements);
    generate_error_free_input_vector(llrs + frame_exp * frame_size, u, frame_size);

    unsigned int u_num = 0;
    for (; u_num < frame_size; u_num++) {
        volk_32f_8u_polarbutterfly_32f_generic(llrs, u, frame_exp, 0, u_num, u_num);
        u[u_num] = llrs[u_num] > 0 ? 0 : 1;
    }

    clean_up_intermediate_values(llrs, u, frame_size, elements);
}
#endif /* LV_HAVE_GENERIC */

#ifdef LV_HAVE_AVX
static inline void volk_32f_8u_polarbutterflypuppet_32f_u_avx(float* llrs,
                                                              const float* input,
                                                              unsigned char* u,
                                                              const int elements)
{
    unsigned int frame_size = maximum_frame_size(elements);
    unsigned int frame_exp = log2_of_power_of_2(frame_size);

    sanitize_bytes(u, elements);
    clean_up_intermediate_values(llrs, u, frame_size, elements);
    generate_error_free_input_vector(llrs + frame_exp * frame_size, u, frame_size);

    unsigned int u_num = 0;
    for (; u_num < frame_size; u_num++) {
        volk_32f_8u_polarbutterfly_32f_u_avx(llrs, u, frame_exp, 0, u_num, u_num);
        u[u_num] = llrs[u_num] > 0 ? 0 : 1;
    }

    clean_up_intermediate_values(llrs, u, frame_size, elements);
}
#endif /* LV_HAVE_AVX */

#ifdef LV_HAVE_AVX2
static inline void volk_32f_8u_polarbutterflypuppet_32f_u_avx2(float* llrs,
                                                               const float* input,
                                                               unsigned char* u,
                                                               const int elements)
{
    unsigned int frame_size = maximum_frame_size(elements);
    unsigned int frame_exp = log2_of_power_of_2(frame_size);

    sanitize_bytes(u, elements);
    clean_up_intermediate_values(llrs, u, frame_size, elements);
    generate_error_free_input_vector(llrs + frame_exp * frame_size, u, frame_size);

    unsigned int u_num = 0;
    for (; u_num < frame_size; u_num++) {
        volk_32f_8u_polarbutterfly_32f_u_avx2(llrs, u, frame_exp, 0, u_num, u_num);
        u[u_num] = llrs[u_num] > 0 ? 0 : 1;
    }

    clean_up_intermediate_values(llrs, u, frame_size, elements);
}
#endif /* LV_HAVE_AVX2 */


#endif /* VOLK_KERNELS_VOLK_VOLK_32F_8U_POLARBUTTERFLYPUPPET_32F_H_ */
