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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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <malloc.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_SSE3
#include <xmmintrin.h>
#include <emmintrin.h>
#ifdef HAVE_SSE4_1
#include <smmintrin.h>
/* 16*N 16-bit signed integer converted to single precision floats */
static void _sse_convert_si16_ps_16n(float *restrict out,
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_load_si128((__m128i *) &in[16 * i + 0]);
m1 = _mm_load_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_store_ps(&out[16 * i + 0], m6);
_mm_store_ps(&out[16 * i + 4], m7);
_mm_store_ps(&out[16 * i + 8], m8);
_mm_store_ps(&out[16 * i + 12], m9);
}
}
#endif /* HAVE_SSE4_1 */
/* 8*N single precision floats scaled and converted to 16-bit signed integer */
static void _sse_convert_scale_ps_si16_8n(short *restrict out,
float *restrict in,
float scale, int len)
{
__m128 m0, m1, m2;
__m128i m4, m5;
for (int i = 0; i < len / 8; i++) {
/* Load (unaligned) packed floats */
m0 = _mm_loadu_ps(&in[8 * i + 0]);
m1 = _mm_loadu_ps(&in[8 * i + 4]);
m2 = _mm_load1_ps(&scale);
/* Scale */
m0 = _mm_mul_ps(m0, m2);
m1 = _mm_mul_ps(m1, m2);
/* Convert */
m4 = _mm_cvtps_epi32(m0);
m5 = _mm_cvtps_epi32(m1);
/* Pack and store */
m5 = _mm_packs_epi32(m4, m5);
_mm_store_si128((__m128i *) &out[8 * i], m5);
}
}
/* 16*N single precision floats scaled and converted to 16-bit signed integer */
static void _sse_convert_scale_ps_si16_16n(short *restrict out,
float *restrict in,
float scale, int len)
{
__m128 m0, m1, m2, m3, m4;
__m128i m5, m6, m7, m8;
for (int i = 0; i < len / 16; i++) {
/* Load (unaligned) packed floats */
m0 = _mm_loadu_ps(&in[16 * i + 0]);
m1 = _mm_loadu_ps(&in[16 * i + 4]);
m2 = _mm_loadu_ps(&in[16 * i + 8]);
m3 = _mm_loadu_ps(&in[16 * i + 12]);
m4 = _mm_load1_ps(&scale);
/* Scale */
m0 = _mm_mul_ps(m0, m4);
m1 = _mm_mul_ps(m1, m4);
m2 = _mm_mul_ps(m2, m4);
m3 = _mm_mul_ps(m3, m4);
/* Convert */
m5 = _mm_cvtps_epi32(m0);
m6 = _mm_cvtps_epi32(m1);
m7 = _mm_cvtps_epi32(m2);
m8 = _mm_cvtps_epi32(m3);
/* Pack and store */
m5 = _mm_packs_epi32(m5, m6);
m7 = _mm_packs_epi32(m7, m8);
_mm_store_si128((__m128i *) &out[16 * i + 0], m5);
_mm_store_si128((__m128i *) &out[16 * i + 8], m7);
}
}
#endif /* HAVE_SSE3 */
static void convert_si16_ps(float *out, short *in, int len)
{
for (int i = 0; i < len; i++)
out[i] = in[i];
}
static void convert_scale_ps_si16(short *out, float *in, float scale, int len)
{
for (int i = 0; i < len; i++)
out[i] = in[i] * scale;
}
void convert_float_short(short *out, float *in, float scale, int len)
{
#ifdef HAVE_SSE3
if (!(len % 16))
_sse_convert_scale_ps_si16_16n(out, in, scale, len);
else if (!(len % 8))
_sse_convert_scale_ps_si16_8n(out, in, scale, len);
else
convert_scale_ps_si16(out, in, scale, len);
#else
convert_scale_ps_si16(out, in, scale, len);
#endif
}
void convert_short_float(float *out, short *in, int len)
{
#ifdef HAVE_SSE4_1
if (!(len % 16))
_sse_convert_si16_ps_16n(out, in, len);
else
convert_si16_ps(out, in, len);
#else
convert_si16_ps(out, in, len);
#endif
}
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