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Downsampler2x4Neon.h
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Downsampler2x4Neon.h
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/*****************************************************************************
Downsampler2x4Neon.h
Author: Laurent de Soras, 2016
Downsamples vectors of 4 float by a factor 2 the input signal, using NEON
instruction set.
This object must be aligned on a 16-byte boundary!
Template parameters:
- NC: number of coefficients, > 0
--- Legal stuff ---
This program is free software. It comes without any warranty, to
the extent permitted by applicable law. You can redistribute it
and/or modify it under the terms of the Do What The Fuck You Want
To Public License, Version 2, as published by Sam Hocevar. See
http://sam.zoy.org/wtfpl/COPYING for more details.
*Tab=3***********************************************************************/
#pragma once
#if ! defined (hiir_Downsampler2x4Neon_HEADER_INCLUDED)
#define hiir_Downsampler2x4Neon_HEADER_INCLUDED
#if defined (_MSC_VER)
#pragma warning (4 : 4250)
#endif
/*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
#include "hiir/def.h"
#include "hiir/StageDataNeonV4.h"
#include <arm_neon.h>
#include <array>
namespace hiir
{
template <int NC>
class Downsampler2x4Neon
{
static_assert ((NC > 0), "Number of coefficient must be positive.");
/*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
public:
typedef float DataType;
static constexpr int _nbr_chn = 4;
static constexpr int NBR_COEFS = NC;
static constexpr double _delay = -1;
Downsampler2x4Neon () noexcept;
Downsampler2x4Neon (const Downsampler2x4Neon <NC> &other) = default;
Downsampler2x4Neon (Downsampler2x4Neon <NC> &&other) = default;
~Downsampler2x4Neon () = default;
Downsampler2x4Neon <NC> &
operator = (const Downsampler2x4Neon <NC> &other) = default;
Downsampler2x4Neon <NC> &
operator = (Downsampler2x4Neon <NC> &&other) = default;
void set_coefs (const double coef_arr []) noexcept;
hiir_FORCEINLINE float32x4_t
process_sample (const float in_ptr [8]) noexcept;
hiir_FORCEINLINE float32x4_t
process_sample (float32x4_t in_0, float32x4_t in_1) noexcept;
void process_block (float out_ptr [], const float in_ptr [], long nbr_spl) noexcept;
hiir_FORCEINLINE void
process_sample_split (float32x4_t &low, float32x4_t &high, const float in_ptr [8]) noexcept;
hiir_FORCEINLINE void
process_sample_split (float32x4_t &low, float32x4_t &high, float32x4_t in_0, float32x4_t in_1) noexcept;
void process_block_split (float out_l_ptr [], float out_h_ptr [], const float in_ptr [], long nbr_spl) noexcept;
void clear_buffers () noexcept;
/*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
protected:
/*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
private:
typedef std::array <StageDataNeonV4, NBR_COEFS + 2> Filter; // Stages 0 and 1 contain only input memories
Filter _filter; // Should be the first member (thus easier to align)
/*\\\ FORBIDDEN MEMBER FUNCTIONS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
private:
bool operator == (const Downsampler2x4Neon <NC> &other) const = delete;
bool operator != (const Downsampler2x4Neon <NC> &other) const = delete;
}; // class Downsampler2x4Neon
} // namespace hiir
#include "hiir/Downsampler2x4Neon.hpp"
#endif // hiir_Downsampler2x4Neon_HEADER_INCLUDED
/*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/