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424c74d006
Remove the paragraph about writing to the Free Software Foundation's mailing address. The FSF has changed addresses in the past, and may do so again. In 2021 this is not useful, let's rather have a bit less boilerplate at the start of source files. Change-Id: I8ba71ab9ccde4ba25151ecbeb2a323f706b57d43
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
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* NEON Convolution
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* Copyright (C) 2012, 2013 Thomas Tsou <tom@tsou.cc>
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*
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* SPDX-License-Identifier: LGPL-2.1+
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*/
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#include <malloc.h>
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#include <string.h>
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#include <stdio.h>
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* Forward declarations from base implementation */
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int _base_convolve_real(float *x, int x_len,
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float *h, int h_len,
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float *y, int y_len,
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int start, int len);
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int _base_convolve_complex(float *x, int x_len,
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float *h, int h_len,
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float *y, int y_len,
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int start, int len);
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int bounds_check(int x_len, int h_len, int y_len,
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int start, int len);
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#ifdef HAVE_NEON
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/* Calls into NEON assembler */
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void neon_conv_real4(float *x, float *h, float *y, int len);
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void neon_conv_real8(float *x, float *h, float *y, int len);
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void neon_conv_real12(float *x, float *h, float *y, int len);
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void neon_conv_real16(float *x, float *h, float *y, int len);
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void neon_conv_real20(float *x, float *h, float *y, int len);
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void mac_cx_neon4(float *x, float *h, float *y, int len);
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/* Complex-complex convolution */
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static void neon_conv_cmplx_4n(float *x, float *h, float *y, int h_len, int len)
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{
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for (int i = 0; i < len; i++)
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mac_cx_neon4(&x[2 * i], h, &y[2 * i], h_len >> 2);
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}
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#endif
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/* API: Initialize convolve module */
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void convolve_init(void)
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{
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/* Stub */
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return;
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}
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/* API: Aligned complex-real */
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int convolve_real(float *x, int x_len,
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float *h, int h_len,
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float *y, int y_len,
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int start, int len)
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{
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void (*conv_func)(float *, float *, float *, int) = NULL;
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if (bounds_check(x_len, h_len, y_len, start, len) < 0)
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return -1;
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memset(y, 0, len * 2 * sizeof(float));
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#ifdef HAVE_NEON
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switch (h_len) {
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case 4:
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conv_func = neon_conv_real4;
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break;
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case 8:
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conv_func = neon_conv_real8;
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break;
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case 12:
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conv_func = neon_conv_real12;
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break;
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case 16:
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conv_func = neon_conv_real16;
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break;
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case 20:
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conv_func = neon_conv_real20;
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break;
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}
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#endif
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if (conv_func) {
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conv_func(&x[2 * (-(h_len - 1) + start)],
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h, y, len);
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} else {
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_base_convolve_real(x, x_len,
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h, h_len,
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y, y_len,
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start, len);
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}
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return len;
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}
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/* API: Aligned complex-complex */
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int convolve_complex(float *x, int x_len,
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float *h, int h_len,
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float *y, int y_len,
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int start, int len)
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{
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void (*conv_func)(float *, float *, float *, int, int) = NULL;
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if (bounds_check(x_len, h_len, y_len, start, len) < 0)
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return -1;
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memset(y, 0, len * 2 * sizeof(float));
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#ifdef HAVE_NEON
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if (!(h_len % 4))
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conv_func = neon_conv_cmplx_4n;
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#endif
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if (conv_func) {
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conv_func(&x[2 * (-(h_len - 1) + start)],
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h, y, h_len, len);
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} else {
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_base_convolve_complex(x, x_len,
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h, h_len,
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y, y_len,
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start, len);
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}
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return len;
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}
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