volk_32f_accumulator_s32f.h

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/* -*- c++ -*- */
/*
 * Copyright 2012, 2014 Free Software Foundation, Inc.
 *
 * This file is part of VOLK
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later
 */
 
#ifndef INCLUDED_volk_32f_accumulator_s32f_a_H
#define INCLUDED_volk_32f_accumulator_s32f_a_H
 
#include <inttypes.h>
#include <volk/volk_common.h>
 
#ifdef LV_HAVE_AVX512F
#include <immintrin.h>
 
static inline void volk_32f_accumulator_s32f_a_avx512f(float* result,
                                                       const float* inputBuffer,
                                                       unsigned int num_points)
{
    float returnValue = 0;
    unsigned int number = 0;
    const unsigned int sixteenthPoints = num_points / 16;
 
    const float* aPtr = inputBuffer;
 
    __m512 accumulator = _mm512_setzero_ps();
    __m512 aVal = _mm512_setzero_ps();
 
    for (; number < sixteenthPoints; number++) {
        aVal = _mm512_load_ps(aPtr);
        accumulator = _mm512_add_ps(accumulator, aVal);
        aPtr += 16;
    }
 
    // Horizontal sum using AVX512 reduce instruction
    returnValue = _mm512_reduce_add_ps(accumulator);
 
    number = sixteenthPoints * 16;
    for (; number < num_points; number++) {
        returnValue += (*aPtr++);
    }
    *result = returnValue;
}
#endif /* LV_HAVE_AVX512F */
 
 
#ifdef LV_HAVE_AVX
#include <immintrin.h>
 
static inline void volk_32f_accumulator_s32f_a_avx(float* result,
                                                   const float* inputBuffer,
                                                   unsigned int num_points)
{
    float returnValue = 0;
    unsigned int number = 0;
    const unsigned int eighthPoints = num_points / 8;
 
    const float* aPtr = inputBuffer;
    __VOLK_ATTR_ALIGNED(32) float tempBuffer[8];
 
    __m256 accumulator = _mm256_setzero_ps();
    __m256 aVal = _mm256_setzero_ps();
 
    for (; number < eighthPoints; number++) {
        aVal = _mm256_load_ps(aPtr);
        accumulator = _mm256_add_ps(accumulator, aVal);
        aPtr += 8;
    }
 
    _mm256_store_ps(tempBuffer, accumulator);
 
    returnValue = tempBuffer[0];
    returnValue += tempBuffer[1];
    returnValue += tempBuffer[2];
    returnValue += tempBuffer[3];
    returnValue += tempBuffer[4];
    returnValue += tempBuffer[5];
    returnValue += tempBuffer[6];
    returnValue += tempBuffer[7];
 
    number = eighthPoints * 8;
    for (; number < num_points; number++) {
        returnValue += (*aPtr++);
    }
    *result = returnValue;
}
#endif /* LV_HAVE_AVX */
 
 
#ifdef LV_HAVE_AVX512F
#include <immintrin.h>
 
static inline void volk_32f_accumulator_s32f_u_avx512f(float* result,
                                                       const float* inputBuffer,
                                                       unsigned int num_points)
{
    float returnValue = 0;
    unsigned int number = 0;
    const unsigned int sixteenthPoints = num_points / 16;
 
    const float* aPtr = inputBuffer;
 
    __m512 accumulator = _mm512_setzero_ps();
    __m512 aVal = _mm512_setzero_ps();
 
    for (; number < sixteenthPoints; number++) {
        aVal = _mm512_loadu_ps(aPtr);
        accumulator = _mm512_add_ps(accumulator, aVal);
        aPtr += 16;
    }
 
    // Horizontal sum using AVX512 reduce instruction
    returnValue = _mm512_reduce_add_ps(accumulator);
 
    number = sixteenthPoints * 16;
    for (; number < num_points; number++) {
        returnValue += (*aPtr++);
    }
    *result = returnValue;
}
#endif /* LV_HAVE_AVX512F */
 
 
#ifdef LV_HAVE_AVX
#include <immintrin.h>
 
static inline void volk_32f_accumulator_s32f_u_avx(float* result,
                                                   const float* inputBuffer,
                                                   unsigned int num_points)
{
    float returnValue = 0;
    unsigned int number = 0;
    const unsigned int eighthPoints = num_points / 8;
 
    const float* aPtr = inputBuffer;
    __VOLK_ATTR_ALIGNED(32) float tempBuffer[8];
 
    __m256 accumulator = _mm256_setzero_ps();
    __m256 aVal = _mm256_setzero_ps();
 
    for (; number < eighthPoints; number++) {
        aVal = _mm256_loadu_ps(aPtr);
        accumulator = _mm256_add_ps(accumulator, aVal);
        aPtr += 8;
    }
 
    _mm256_store_ps(tempBuffer, accumulator);
 
    returnValue = tempBuffer[0];
    returnValue += tempBuffer[1];
    returnValue += tempBuffer[2];
    returnValue += tempBuffer[3];
    returnValue += tempBuffer[4];
    returnValue += tempBuffer[5];
    returnValue += tempBuffer[6];
    returnValue += tempBuffer[7];
 
    number = eighthPoints * 8;
    for (; number < num_points; number++) {
        returnValue += (*aPtr++);
    }
    *result = returnValue;
}
#endif /* LV_HAVE_AVX */
 
 
#ifdef LV_HAVE_SSE
#include <xmmintrin.h>
 
static inline void volk_32f_accumulator_s32f_a_sse(float* result,
                                                   const float* inputBuffer,
                                                   unsigned int num_points)
{
    float returnValue = 0;
    unsigned int number = 0;
    const unsigned int quarterPoints = num_points / 4;
 
    const float* aPtr = inputBuffer;
    __VOLK_ATTR_ALIGNED(16) float tempBuffer[4];
 
    __m128 accumulator = _mm_setzero_ps();
    __m128 aVal = _mm_setzero_ps();
 
    for (; number < quarterPoints; number++) {
        aVal = _mm_load_ps(aPtr);
        accumulator = _mm_add_ps(accumulator, aVal);
        aPtr += 4;
    }
 
    _mm_store_ps(tempBuffer, accumulator);
 
    returnValue = tempBuffer[0];
    returnValue += tempBuffer[1];
    returnValue += tempBuffer[2];
    returnValue += tempBuffer[3];
 
    number = quarterPoints * 4;
    for (; number < num_points; number++) {
        returnValue += (*aPtr++);
    }
    *result = returnValue;
}
#endif /* LV_HAVE_SSE */
 
 
#ifdef LV_HAVE_SSE
#include <xmmintrin.h>
 
static inline void volk_32f_accumulator_s32f_u_sse(float* result,
                                                   const float* inputBuffer,
                                                   unsigned int num_points)
{
    float returnValue = 0;
    unsigned int number = 0;
    const unsigned int quarterPoints = num_points / 4;
 
    const float* aPtr = inputBuffer;
    __VOLK_ATTR_ALIGNED(16) float tempBuffer[4];
 
    __m128 accumulator = _mm_setzero_ps();
    __m128 aVal = _mm_setzero_ps();
 
    for (; number < quarterPoints; number++) {
        aVal = _mm_loadu_ps(aPtr);
        accumulator = _mm_add_ps(accumulator, aVal);
        aPtr += 4;
    }
 
    _mm_store_ps(tempBuffer, accumulator);
 
    returnValue = tempBuffer[0];
    returnValue += tempBuffer[1];
    returnValue += tempBuffer[2];
    returnValue += tempBuffer[3];
 
    number = quarterPoints * 4;
    for (; number < num_points; number++) {
        returnValue += (*aPtr++);
    }
    *result = returnValue;
}
#endif /* LV_HAVE_SSE */
 
 
#ifdef LV_HAVE_NEON
#include <arm_neon.h>
 
static inline void volk_32f_accumulator_s32f_neon(float* result,
                                                  const float* inputBuffer,
                                                  unsigned int num_points)
{
    float returnValue = 0;
    unsigned int number = 0;
    const unsigned int quarterPoints = num_points / 4;
 
    const float* aPtr = inputBuffer;
    float32x4_t accumulator = vdupq_n_f32(0.0f);
    float32x4_t aVal;
 
    for (; number < quarterPoints; number++) {
        aVal = vld1q_f32(aPtr);
        accumulator = vaddq_f32(accumulator, aVal);
        aPtr += 4;
    }
 
    // Horizontal sum - manual for NEON (ARMv7 compatible)
    float32x2_t sum_pair =
        vadd_f32(vget_low_f32(accumulator), vget_high_f32(accumulator));
    sum_pair = vpadd_f32(sum_pair, sum_pair);
    returnValue = vget_lane_f32(sum_pair, 0);
 
    number = quarterPoints * 4;
    for (; number < num_points; number++) {
        returnValue += (*aPtr++);
    }
    *result = returnValue;
}
#endif /* LV_HAVE_NEON */
 
 
#ifdef LV_HAVE_NEONV8
#include <arm_neon.h>
 
static inline void volk_32f_accumulator_s32f_neonv8(float* result,
                                                    const float* inputBuffer,
                                                    unsigned int num_points)
{
    float returnValue = 0;
    unsigned int number = 0;
    const unsigned int eighthPoints = num_points / 8;
 
    const float* aPtr = inputBuffer;
    float32x4_t accumulator0 = vdupq_n_f32(0.0f);
    float32x4_t accumulator1 = vdupq_n_f32(0.0f);
 
    // 2x unrolled loop for better instruction-level parallelism
    for (; number < eighthPoints; number++) {
        float32x4_t aVal0 = vld1q_f32(aPtr);
        float32x4_t aVal1 = vld1q_f32(aPtr + 4);
        __VOLK_PREFETCH(aPtr + 8);
        accumulator0 = vaddq_f32(accumulator0, aVal0);
        accumulator1 = vaddq_f32(accumulator1, aVal1);
        aPtr += 8;
    }
 
    // Combine accumulators
    accumulator0 = vaddq_f32(accumulator0, accumulator1);
 
    // ARMv8 horizontal sum using vaddvq_f32
    returnValue = vaddvq_f32(accumulator0);
 
    number = eighthPoints * 8;
    for (; number < num_points; number++) {
        returnValue += (*aPtr++);
    }
    *result = returnValue;
}
#endif /* LV_HAVE_NEONV8 */
 
 
#ifdef LV_HAVE_GENERIC
static inline void volk_32f_accumulator_s32f_generic(float* result,
                                                     const float* inputBuffer,
                                                     unsigned int num_points)
{
    const float* aPtr = inputBuffer;
    unsigned int number = 0;
    float returnValue = 0;
 
    for (; number < num_points; number++) {
        returnValue += (*aPtr++);
    }
    *result = returnValue;
}
#endif /* LV_HAVE_GENERIC */
 
#ifdef LV_HAVE_RVV
#include <riscv_vector.h>
#include <volk/volk_rvv_intrinsics.h>
 
static inline void volk_32f_accumulator_s32f_rvv(float* result,
                                                 const float* inputBuffer,
                                                 unsigned int num_points)
{
    vfloat32m8_t vsum = __riscv_vfmv_v_f_f32m8(0, __riscv_vsetvlmax_e32m8());
    size_t n = num_points;
    for (size_t vl; n > 0; n -= vl, inputBuffer += vl) {
        vl = __riscv_vsetvl_e32m8(n);
        vfloat32m8_t v = __riscv_vle32_v_f32m8(inputBuffer, vl);
        vsum = __riscv_vfadd_tu(vsum, vsum, v, vl);
    }
    size_t vl = __riscv_vsetvlmax_e32m1();
    vfloat32m1_t v = RISCV_SHRINK8(vfadd, f, 32, vsum);
    vfloat32m1_t z = __riscv_vfmv_s_f_f32m1(0, vl);
    *result = __riscv_vfmv_f(__riscv_vfredusum(v, z, vl));
}
#endif /*LV_HAVE_RVV*/
 
#endif /* INCLUDED_volk_32f_accumulator_s32f_a_H */