97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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* NEON type conversions
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* Copyright (C) 2012, 2013 Thomas Tsou <tom@tsou.cc>
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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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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <malloc.h>
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#include <string.h>
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#include "convert.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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void neon_convert_ps_si16_4n(short *, float *, float *, int);
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void neon_convert_si16_ps_4n(float *, short *, int);
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#ifndef HAVE_NEON
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static void convert_si16_ps(float *out, short *in, int len)
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{
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for (int i = 0; i < len; i++)
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out[i] = in[i];
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}
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static void convert_ps_si16(short *out, float *in, float scale, int len)
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{
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for (int i = 0; i < len; i++)
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out[i] = in[i] * scale;
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}
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#else
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/* 4*N 16-bit signed integer conversion with remainder */
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static void neon_convert_si16_ps(float *restrict out,
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short *restrict in,
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int len)
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{
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int start = len / 4 * 4;
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neon_convert_si16_ps_4n(out, in, len >> 2);
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for (int i = 0; i < len % 4; i++)
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out[start + i] = (float) in[start + i];
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}
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/* 4*N 16-bit signed integer conversion with remainder */
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static void neon_convert_ps_si16(short *restrict out,
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float *restrict in,
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float *restrict scale,
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int len)
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{
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int start = len / 4 * 4;
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neon_convert_ps_si16_4n(out, in, scale, len >> 2);
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for (int i = 0; i < len % 4; i++)
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out[start + i] = (short) (in[start + i] * (*scale));
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}
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#endif
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void convert_float_short(short *out, float *in, float scale, int len)
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{
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#ifdef HAVE_NEON
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float q[4] = { scale, scale, scale, scale };
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if (len % 4)
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neon_convert_ps_si16(out, in, q, len);
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else
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neon_convert_ps_si16_4n(out, in, q, len >> 2);
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#else
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convert_ps_si16(out, in, scale, len);
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#endif
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}
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void convert_short_float(float *out, short *in, int len)
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{
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#ifdef HAVE_NEON
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if (len % 4)
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neon_convert_si16_ps(out, in, len);
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else
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neon_convert_si16_ps_4n(out, in, len >> 2);
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#else
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convert_si16_ps(out, in, len);
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#endif
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}
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