volk_16i_convert_8i.h

Go to the documentation of this file.

/* -*- 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_16i_convert_8i_u_H
#define INCLUDED_volk_16i_convert_8i_u_H
 
#include <inttypes.h>
#include <stdio.h>
 
#ifdef LV_HAVE_AVX2
#include <immintrin.h>
 
static inline void volk_16i_convert_8i_u_avx2(int8_t* outputVector,
                                              const int16_t* inputVector,
                                              unsigned int num_points)
{
    unsigned int number = 0;
    const unsigned int thirtysecondPoints = num_points / 32;
 
    int8_t* outputVectorPtr = outputVector;
    int16_t* inputPtr = (int16_t*)inputVector;
    __m256i inputVal1;
    __m256i inputVal2;
    __m256i ret;
 
    for (; number < thirtysecondPoints; number++) {
 
        // Load the 16 values
        inputVal1 = _mm256_loadu_si256((__m256i*)inputPtr);
        inputPtr += 16;
        inputVal2 = _mm256_loadu_si256((__m256i*)inputPtr);
        inputPtr += 16;
 
        inputVal1 = _mm256_srai_epi16(inputVal1, 8);
        inputVal2 = _mm256_srai_epi16(inputVal2, 8);
 
        ret = _mm256_packs_epi16(inputVal1, inputVal2);
        ret = _mm256_permute4x64_epi64(ret, 0b11011000);
 
        _mm256_storeu_si256((__m256i*)outputVectorPtr, ret);
 
        outputVectorPtr += 32;
    }
 
    number = thirtysecondPoints * 32;
    for (; number < num_points; number++) {
        outputVector[number] = (int8_t)(inputVector[number] >> 8);
    }
}
#endif /* LV_HAVE_AVX2 */
 
 
#ifdef LV_HAVE_SSE2
#include <emmintrin.h>
 
static inline void volk_16i_convert_8i_u_sse2(int8_t* outputVector,
                                              const int16_t* inputVector,
                                              unsigned int num_points)
{
    unsigned int number = 0;
    const unsigned int sixteenthPoints = num_points / 16;
 
    int8_t* outputVectorPtr = outputVector;
    int16_t* inputPtr = (int16_t*)inputVector;
    __m128i inputVal1;
    __m128i inputVal2;
    __m128i ret;
 
    for (; number < sixteenthPoints; number++) {
 
        // Load the 16 values
        inputVal1 = _mm_loadu_si128((__m128i*)inputPtr);
        inputPtr += 8;
        inputVal2 = _mm_loadu_si128((__m128i*)inputPtr);
        inputPtr += 8;
 
        inputVal1 = _mm_srai_epi16(inputVal1, 8);
        inputVal2 = _mm_srai_epi16(inputVal2, 8);
 
        ret = _mm_packs_epi16(inputVal1, inputVal2);
 
        _mm_storeu_si128((__m128i*)outputVectorPtr, ret);
 
        outputVectorPtr += 16;
    }
 
    number = sixteenthPoints * 16;
    for (; number < num_points; number++) {
        outputVector[number] = (int8_t)(inputVector[number] >> 8);
    }
}
#endif /* LV_HAVE_SSE2 */
 
 
#ifdef LV_HAVE_GENERIC
 
static inline void volk_16i_convert_8i_generic(int8_t* outputVector,
                                               const int16_t* inputVector,
                                               unsigned int num_points)
{
    int8_t* outputVectorPtr = outputVector;
    const int16_t* inputVectorPtr = inputVector;
    unsigned int number = 0;
 
    for (number = 0; number < num_points; number++) {
        *outputVectorPtr++ = ((int8_t)(*inputVectorPtr++ >> 8));
    }
}
#endif /* LV_HAVE_GENERIC */
 
 
#endif /* INCLUDED_volk_16i_convert_8i_u_H */
#ifndef INCLUDED_volk_16i_convert_8i_a_H
#define INCLUDED_volk_16i_convert_8i_a_H
 
#include <inttypes.h>
#include <stdio.h>
 
#ifdef LV_HAVE_AVX2
#include <immintrin.h>
 
static inline void volk_16i_convert_8i_a_avx2(int8_t* outputVector,
                                              const int16_t* inputVector,
                                              unsigned int num_points)
{
    unsigned int number = 0;
    const unsigned int thirtysecondPoints = num_points / 32;
 
    int8_t* outputVectorPtr = outputVector;
    int16_t* inputPtr = (int16_t*)inputVector;
    __m256i inputVal1;
    __m256i inputVal2;
    __m256i ret;
 
    for (; number < thirtysecondPoints; number++) {
 
        // Load the 16 values
        inputVal1 = _mm256_load_si256((__m256i*)inputPtr);
        inputPtr += 16;
        inputVal2 = _mm256_load_si256((__m256i*)inputPtr);
        inputPtr += 16;
 
        inputVal1 = _mm256_srai_epi16(inputVal1, 8);
        inputVal2 = _mm256_srai_epi16(inputVal2, 8);
 
        ret = _mm256_packs_epi16(inputVal1, inputVal2);
        ret = _mm256_permute4x64_epi64(ret, 0b11011000);
 
        _mm256_store_si256((__m256i*)outputVectorPtr, ret);
 
        outputVectorPtr += 32;
    }
 
    number = thirtysecondPoints * 32;
    for (; number < num_points; number++) {
        outputVector[number] = (int8_t)(inputVector[number] >> 8);
    }
}
#endif /* LV_HAVE_AVX2 */
 
 
#ifdef LV_HAVE_SSE2
#include <emmintrin.h>
 
static inline void volk_16i_convert_8i_a_sse2(int8_t* outputVector,
                                              const int16_t* inputVector,
                                              unsigned int num_points)
{
    unsigned int number = 0;
    const unsigned int sixteenthPoints = num_points / 16;
 
    int8_t* outputVectorPtr = outputVector;
    int16_t* inputPtr = (int16_t*)inputVector;
    __m128i inputVal1;
    __m128i inputVal2;
    __m128i ret;
 
    for (; number < sixteenthPoints; number++) {
 
        // Load the 16 values
        inputVal1 = _mm_load_si128((__m128i*)inputPtr);
        inputPtr += 8;
        inputVal2 = _mm_load_si128((__m128i*)inputPtr);
        inputPtr += 8;
 
        inputVal1 = _mm_srai_epi16(inputVal1, 8);
        inputVal2 = _mm_srai_epi16(inputVal2, 8);
 
        ret = _mm_packs_epi16(inputVal1, inputVal2);
 
        _mm_store_si128((__m128i*)outputVectorPtr, ret);
 
        outputVectorPtr += 16;
    }
 
    number = sixteenthPoints * 16;
    for (; number < num_points; number++) {
        outputVector[number] = (int8_t)(inputVector[number] >> 8);
    }
}
#endif /* LV_HAVE_SSE2 */
 
 
#ifdef LV_HAVE_NEON
#include <arm_neon.h>
 
static inline void volk_16i_convert_8i_neon(int8_t* outputVector,
                                            const int16_t* inputVector,
                                            unsigned int num_points)
{
    int8_t* outputVectorPtr = outputVector;
    const int16_t* inputVectorPtr = inputVector;
    unsigned int number = 0;
    unsigned int sixteenth_points = num_points / 16;
 
    int16x8_t inputVal0;
    int16x8_t inputVal1;
    int8x8_t outputVal0;
    int8x8_t outputVal1;
    int8x16_t outputVal;
 
    for (number = 0; number < sixteenth_points; number++) {
        // load two input vectors
        inputVal0 = vld1q_s16(inputVectorPtr);
        inputVal1 = vld1q_s16(inputVectorPtr + 8);
        // shift right
        outputVal0 = vshrn_n_s16(inputVal0, 8);
        outputVal1 = vshrn_n_s16(inputVal1, 8);
        // squash two vectors and write output
        outputVal = vcombine_s8(outputVal0, outputVal1);
        vst1q_s8(outputVectorPtr, outputVal);
        inputVectorPtr += 16;
        outputVectorPtr += 16;
    }
 
    for (number = sixteenth_points * 16; number < num_points; number++) {
        *outputVectorPtr++ = ((int8_t)(*inputVectorPtr++ >> 8));
    }
}
#endif /* LV_HAVE_NEON */
 
 
#ifdef LV_HAVE_GENERIC
 
static inline void volk_16i_convert_8i_a_generic(int8_t* outputVector,
                                                 const int16_t* inputVector,
                                                 unsigned int num_points)
{
    int8_t* outputVectorPtr = outputVector;
    const int16_t* inputVectorPtr = inputVector;
    unsigned int number = 0;
 
    for (number = 0; number < num_points; number++) {
        *outputVectorPtr++ = ((int8_t)(*inputVectorPtr++ >> 8));
    }
}
#endif /* LV_HAVE_GENERIC */
 
#endif /* INCLUDED_volk_16i_convert_8i_a_H */