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/*
* SSE type conversions
* Copyright (C) 2013 Thomas Tsou <tom@tsou.cc>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*/
#include <malloc.h>
#include <string.h>
#include "convert_sse_4_1.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_SSE4_1
#include <smmintrin.h>
/* 16*N 16-bit signed integer converted to single precision floats */
void _sse_convert_si16_ps_16n(float *restrict out,
const short *restrict in, int len)
{
__m128i m0, m1, m2, m3, m4, m5;
__m128 m6, m7, m8, m9;
for (int i = 0; i < len / 16; i++) {
/* Load (unaligned) packed floats */
m0 = _mm_loadu_si128((__m128i *) & in[16 * i + 0]);
m1 = _mm_loadu_si128((__m128i *) & in[16 * i + 8]);
/* Unpack */
m2 = _mm_cvtepi16_epi32(m0);
m4 = _mm_cvtepi16_epi32(m1);
m0 = _mm_shuffle_epi32(m0, _MM_SHUFFLE(1, 0, 3, 2));
m1 = _mm_shuffle_epi32(m1, _MM_SHUFFLE(1, 0, 3, 2));
m3 = _mm_cvtepi16_epi32(m0);
m5 = _mm_cvtepi16_epi32(m1);
/* Convert */
m6 = _mm_cvtepi32_ps(m2);
m7 = _mm_cvtepi32_ps(m3);
m8 = _mm_cvtepi32_ps(m4);
m9 = _mm_cvtepi32_ps(m5);
/* Store */
_mm_storeu_ps(&out[16 * i + 0], m6);
_mm_storeu_ps(&out[16 * i + 4], m7);
_mm_storeu_ps(&out[16 * i + 8], m8);
_mm_storeu_ps(&out[16 * i + 12], m9);
}
}
/* 16*N 16-bit signed integer conversion with remainder */
void _sse_convert_si16_ps(float *restrict out,
const short *restrict in, int len)
{
int start = len / 16 * 16;
_sse_convert_si16_ps_16n(out, in, len);
for (int i = 0; i < len % 16; i++)
out[start + i] = in[start + i];
}
#endif
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