/usr/include/volk/volk_64u_popcnt.h is in libvolk1-dev 1.2.1-1.
This file is owned by root:root, with mode 0o644.
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/*
* Copyright 2012, 2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
/*!
* \page volk_64u_popcnt
*
* \b Overview
*
* Computes the population count (popcnt), or Hamming distance of a
* binary string. This kernel takes in a single unsigned 64-bit value
* and returns the count of 1's that the value contains.
*
* <b>Dispatcher Prototype</b>
* \code
* void volk_64u_popcnt(uint64_t* ret, const uint64_t value)
* \endcode
*
* \b Inputs
* \li value: The input value.
*
* \b Outputs
* \li ret: The return value containing the popcnt.
*
* \b Example
* \code
* int N = 10;
* unsigned int alignment = volk_get_alignment();
*
* uint64_t bitstring[] = {0x0, 0x1, 0xf, 0xffffffffffffffff,
* 0x5555555555555555, 0xaaaaaaaaaaaaaaaa, 0x2a2a2a2a2a2a2a2a,
* 0xffffffff, 0x32, 0x64};
* uint64_t hamming_distance = 0;
*
* for(unsigned int ii=0; ii<N; ++ii){
* volk_64u_popcnt(&hamming_distance, bitstring[ii]);
* printf("hamming distance of %lx = %li\n", bitstring[ii], hamming_distance);
* }
* \endcode
*/
#ifndef INCLUDED_volk_64u_popcnt_a_H
#define INCLUDED_volk_64u_popcnt_a_H
#include <stdio.h>
#include <inttypes.h>
#ifdef LV_HAVE_GENERIC
static inline void
volk_64u_popcnt_generic(uint64_t* ret, const uint64_t value)
{
//const uint32_t* valueVector = (const uint32_t*)&value;
// This is faster than a lookup table
//uint32_t retVal = valueVector[0];
uint32_t retVal = (uint32_t)(value & 0x00000000FFFFFFFFull);
retVal = (retVal & 0x55555555) + (retVal >> 1 & 0x55555555);
retVal = (retVal & 0x33333333) + (retVal >> 2 & 0x33333333);
retVal = (retVal + (retVal >> 4)) & 0x0F0F0F0F;
retVal = (retVal + (retVal >> 8));
retVal = (retVal + (retVal >> 16)) & 0x0000003F;
uint64_t retVal64 = retVal;
//retVal = valueVector[1];
retVal = (uint32_t)((value & 0xFFFFFFFF00000000ull) >> 31);
retVal = (retVal & 0x55555555) + (retVal >> 1 & 0x55555555);
retVal = (retVal & 0x33333333) + (retVal >> 2 & 0x33333333);
retVal = (retVal + (retVal >> 4)) & 0x0F0F0F0F;
retVal = (retVal + (retVal >> 8));
retVal = (retVal + (retVal >> 16)) & 0x0000003F;
retVal64 += retVal;
*ret = retVal64;
}
#endif /*LV_HAVE_GENERIC*/
#if LV_HAVE_SSE4_2 && LV_HAVE_64
#include <nmmintrin.h>
static inline void volk_64u_popcnt_a_sse4_2(uint64_t* ret, const uint64_t value)
{
*ret = _mm_popcnt_u64(value);
}
#endif /*LV_HAVE_SSE4_2*/
#if LV_HAVE_NEON
#include <arm_neon.h>
static inline void volk_64u_popcnt_neon(uint64_t* ret, const uint64_t value)
{
uint8x8_t input_val, count8x8_val;
uint16x4_t count16x4_val;
uint32x2_t count32x2_val;
uint64x1_t count64x1_val;
input_val = vld1_u8((unsigned char *) &value);
count8x8_val = vcnt_u8(input_val);
count16x4_val = vpaddl_u8(count8x8_val);
count32x2_val = vpaddl_u16(count16x4_val);
count64x1_val = vpaddl_u32(count32x2_val);
vst1_u64(ret, count64x1_val);
//*ret = _mm_popcnt_u64(value);
}
#endif /*LV_HAVE_NEON*/
#endif /*INCLUDED_volk_64u_popcnt_a_H*/
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