/* -*- c++ -*- */
/*
 * Copyright 2012, 2014 Free Software Foundation, Inc.
 *
 * This file is part of VOLK
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

/*!
 * \page volk_32f_x2_subtract_32f
 *
 * \b Overview
 *
 * Subtracts values in bVector from values in aVector.
 *
 * c[i] = a[i] - b[i]
 *
 * <b>Dispatcher Prototype</b>
 * \code
 * void volk_32f_x2_subtract_32f(float* cVector, const float* aVector, const float*
 * bVector, unsigned int num_points) \endcode
 *
 * \b Inputs
 * \li aVector: The initial vector.
 * \li bVector: The vector to be subtracted.
 * \li num_points: The number of values in both input vectors.
 *
 * \b Outputs
 * \li complexVector: The output vector.
 *
 * \b Example
 * Subtract and increasing vector from a decreasing vector.
 * \code
 *   int N = 10;
 *   unsigned int alignment = volk_get_alignment();
 *   float* increasing = (float*)volk_malloc(sizeof(float)*N, alignment);
 *   float* decreasing = (float*)volk_malloc(sizeof(float)*N, alignment);
 *   float* out = (float*)volk_malloc(sizeof(float)*N, alignment);
 *
 *   for(unsigned int ii = 0; ii < N; ++ii){
 *       increasing[ii] = (float)ii;
 *       decreasing[ii] = 10.f - (float)ii;
 *   }
 *
 *   volk_32f_x2_subtract_32f(out, increasing, decreasing, N);
 *
 *   for(unsigned int ii = 0; ii < N; ++ii){
 *       printf("out[%u] = %1.2f\n", ii, out[ii]);
 *   }
 *
 *   volk_free(increasing);
 *   volk_free(decreasing);
 *   volk_free(out);
 * \endcode
 */

#ifndef INCLUDED_volk_32f_x2_subtract_32f_a_H
#define INCLUDED_volk_32f_x2_subtract_32f_a_H

#include <inttypes.h>
#include <stdio.h>

#ifdef LV_HAVE_AVX512F
#include <immintrin.h>

static inline void volk_32f_x2_subtract_32f_a_avx512f(float* cVector,
                                                      const float* aVector,
                                                      const float* bVector,
                                                      unsigned int num_points)
{
    unsigned int number = 0;
    const unsigned int sixteenthPoints = num_points / 16;

    float* cPtr = cVector;
    const float* aPtr = aVector;
    const float* bPtr = bVector;

    __m512 aVal, bVal, cVal;
    for (; number < sixteenthPoints; number++) {

        aVal = _mm512_load_ps(aPtr);
        bVal = _mm512_load_ps(bPtr);

        cVal = _mm512_sub_ps(aVal, bVal);

        _mm512_store_ps(cPtr, cVal); // Store the results back into the C container

        aPtr += 16;
        bPtr += 16;
        cPtr += 16;
    }

    number = sixteenthPoints * 16;
    for (; number < num_points; number++) {
        *cPtr++ = (*aPtr++) - (*bPtr++);
    }
}
#endif /* LV_HAVE_AVX512F */

#ifdef LV_HAVE_AVX
#include <immintrin.h>

static inline void volk_32f_x2_subtract_32f_a_avx(float* cVector,
                                                  const float* aVector,
                                                  const float* bVector,
                                                  unsigned int num_points)
{
    unsigned int number = 0;
    const unsigned int eighthPoints = num_points / 8;

    float* cPtr = cVector;
    const float* aPtr = aVector;
    const float* bPtr = bVector;

    __m256 aVal, bVal, cVal;
    for (; number < eighthPoints; number++) {

        aVal = _mm256_load_ps(aPtr);
        bVal = _mm256_load_ps(bPtr);

        cVal = _mm256_sub_ps(aVal, bVal);

        _mm256_store_ps(cPtr, cVal); // Store the results back into the C container

        aPtr += 8;
        bPtr += 8;
        cPtr += 8;
    }

    number = eighthPoints * 8;
    for (; number < num_points; number++) {
        *cPtr++ = (*aPtr++) - (*bPtr++);
    }
}
#endif /* LV_HAVE_AVX */

#ifdef LV_HAVE_SSE
#include <xmmintrin.h>

static inline void volk_32f_x2_subtract_32f_a_sse(float* cVector,
                                                  const float* aVector,
                                                  const float* bVector,
                                                  unsigned int num_points)
{
    unsigned int number = 0;
    const unsigned int quarterPoints = num_points / 4;

    float* cPtr = cVector;
    const float* aPtr = aVector;
    const float* bPtr = bVector;

    __m128 aVal, bVal, cVal;
    for (; number < quarterPoints; number++) {

        aVal = _mm_load_ps(aPtr);
        bVal = _mm_load_ps(bPtr);

        cVal = _mm_sub_ps(aVal, bVal);

        _mm_store_ps(cPtr, cVal); // Store the results back into the C container

        aPtr += 4;
        bPtr += 4;
        cPtr += 4;
    }

    number = quarterPoints * 4;
    for (; number < num_points; number++) {
        *cPtr++ = (*aPtr++) - (*bPtr++);
    }
}
#endif /* LV_HAVE_SSE */


#ifdef LV_HAVE_GENERIC

static inline void volk_32f_x2_subtract_32f_generic(float* cVector,
                                                    const float* aVector,
                                                    const float* bVector,
                                                    unsigned int num_points)
{
    float* cPtr = cVector;
    const float* aPtr = aVector;
    const float* bPtr = bVector;
    unsigned int number = 0;

    for (number = 0; number < num_points; number++) {
        *cPtr++ = (*aPtr++) - (*bPtr++);
    }
}
#endif /* LV_HAVE_GENERIC */


#ifdef LV_HAVE_NEON
#include <arm_neon.h>

static inline void volk_32f_x2_subtract_32f_neon(float* cVector,
                                                 const float* aVector,
                                                 const float* bVector,
                                                 unsigned int num_points)
{
    float* cPtr = cVector;
    const float* aPtr = aVector;
    const float* bPtr = bVector;
    unsigned int number = 0;
    unsigned int quarter_points = num_points / 4;

    float32x4_t a_vec, b_vec, c_vec;

    for (number = 0; number < quarter_points; number++) {
        a_vec = vld1q_f32(aPtr);
        b_vec = vld1q_f32(bPtr);
        c_vec = vsubq_f32(a_vec, b_vec);
        vst1q_f32(cPtr, c_vec);
        aPtr += 4;
        bPtr += 4;
        cPtr += 4;
    }

    for (number = quarter_points * 4; number < num_points; number++) {
        *cPtr++ = (*aPtr++) - (*bPtr++);
    }
}
#endif /* LV_HAVE_NEON */


#ifdef LV_HAVE_ORC
extern void volk_32f_x2_subtract_32f_a_orc_impl(float* cVector,
                                                const float* aVector,
                                                const float* bVector,
                                                unsigned int num_points);

static inline void volk_32f_x2_subtract_32f_u_orc(float* cVector,
                                                  const float* aVector,
                                                  const float* bVector,
                                                  unsigned int num_points)
{
    volk_32f_x2_subtract_32f_a_orc_impl(cVector, aVector, bVector, num_points);
}
#endif /* LV_HAVE_ORC */


#endif /* INCLUDED_volk_32f_x2_subtract_32f_a_H */


#ifndef INCLUDED_volk_32f_x2_subtract_32f_u_H
#define INCLUDED_volk_32f_x2_subtract_32f_u_H

#include <inttypes.h>
#include <stdio.h>

#ifdef LV_HAVE_AVX512F
#include <immintrin.h>

static inline void volk_32f_x2_subtract_32f_u_avx512f(float* cVector,
                                                      const float* aVector,
                                                      const float* bVector,
                                                      unsigned int num_points)
{
    unsigned int number = 0;
    const unsigned int sixteenthPoints = num_points / 16;

    float* cPtr = cVector;
    const float* aPtr = aVector;
    const float* bPtr = bVector;

    __m512 aVal, bVal, cVal;
    for (; number < sixteenthPoints; number++) {

        aVal = _mm512_loadu_ps(aPtr);
        bVal = _mm512_loadu_ps(bPtr);

        cVal = _mm512_sub_ps(aVal, bVal);

        _mm512_storeu_ps(cPtr, cVal); // Store the results back into the C container

        aPtr += 16;
        bPtr += 16;
        cPtr += 16;
    }

    number = sixteenthPoints * 16;
    for (; number < num_points; number++) {
        *cPtr++ = (*aPtr++) - (*bPtr++);
    }
}
#endif /* LV_HAVE_AVX512F */


#ifdef LV_HAVE_AVX
#include <immintrin.h>

static inline void volk_32f_x2_subtract_32f_u_avx(float* cVector,
                                                  const float* aVector,
                                                  const float* bVector,
                                                  unsigned int num_points)
{
    unsigned int number = 0;
    const unsigned int eighthPoints = num_points / 8;

    float* cPtr = cVector;
    const float* aPtr = aVector;
    const float* bPtr = bVector;

    __m256 aVal, bVal, cVal;
    for (; number < eighthPoints; number++) {

        aVal = _mm256_loadu_ps(aPtr);
        bVal = _mm256_loadu_ps(bPtr);

        cVal = _mm256_sub_ps(aVal, bVal);

        _mm256_storeu_ps(cPtr, cVal); // Store the results back into the C container

        aPtr += 8;
        bPtr += 8;
        cPtr += 8;
    }

    number = eighthPoints * 8;
    for (; number < num_points; number++) {
        *cPtr++ = (*aPtr++) - (*bPtr++);
    }
}
#endif /* LV_HAVE_AVX */

#endif /* INCLUDED_volk_32f_x2_subtract_32f_u_H */
