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audioconvert: optimize dither

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Add sse2 dither optimization
This commit is contained in:
Wim Taymans 2022-06-27 14:15:01 +02:00
parent 9f55708e9d
commit b41d52cfd1
6 changed files with 160 additions and 17 deletions
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97
spa/plugins/audioconvert/dither-ops-sse2.c Normal file
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/* Spa
*
* Copyright © 2022 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "dither-ops.h"
#include <emmintrin.h>
static inline void update_dither_sse2(struct dither *dt, uint32_t n_samples)
{
uint32_t n;
const uint32_t *r = dt->random;
__m128 scale = _mm_set1_ps(dt->scale), out[1];
__m128i in[1], t[1];
for (n = 0; n < n_samples; n += 4) {
/* 32 bit xorshift PRNG, see https://en.wikipedia.org/wiki/Xorshift */
in[0] = _mm_loadu_si128((__m128i*)r);
t[0] = _mm_slli_epi32(in[0], 13);
in[0] = _mm_xor_si128(in[0], t[0]);
t[0] = _mm_srli_epi32(in[0], 17);
in[0] = _mm_xor_si128(in[0], t[0]);
t[0] = _mm_slli_epi32(in[0], 5);
in[0] = _mm_xor_si128(in[0], t[0]);
_mm_storeu_si128((__m128i*)r, in[0]);
out[0] = _mm_cvtepi32_ps(in[0]);
out[0] = _mm_mul_ps(out[0], scale);
_mm_storeu_ps(&dt->dither[n], out[0]);
}
}
void dither_f32_sse2(struct dither *dt, void * SPA_RESTRICT dst[],
const void * SPA_RESTRICT src[], uint32_t n_samples)
{
uint32_t i, n, m, chunk, unrolled;
const float **s = (const float**)src;
float **d = (float**)dst;
float *t = dt->dither;
__m128 in[4];
chunk = SPA_MIN(n_samples, dt->dither_size);
update_dither_sse2(dt, chunk);
for (n = 0; n < n_samples; n += chunk) {
chunk = SPA_MIN(n_samples - n, dt->dither_size);
for (i = 0; i < dt->n_channels; i++) {
float *di = &d[i][n];
const float *si = &s[i][n];
if (SPA_IS_ALIGNED(di, 16) &&
SPA_IS_ALIGNED(si, 16))
unrolled = chunk & ~15;
else
unrolled = 0;
for (m = 0; m < unrolled; m += 16) {
in[0] = _mm_load_ps(&si[m ]);
in[1] = _mm_load_ps(&si[m + 4]);
in[2] = _mm_load_ps(&si[m + 8]);
in[3] = _mm_load_ps(&si[m + 12]);
in[0] = _mm_add_ps(in[0], _mm_load_ps(&t[m ]));
in[1] = _mm_add_ps(in[1], _mm_load_ps(&t[m + 4]));
in[2] = _mm_add_ps(in[2], _mm_load_ps(&t[m + 8]));
in[3] = _mm_add_ps(in[3], _mm_load_ps(&t[m + 12]));
_mm_store_ps(&di[m ], in[0]);
_mm_store_ps(&di[m + 4], in[1]);
_mm_store_ps(&di[m + 8], in[2]);
_mm_store_ps(&di[m + 12], in[3]);
}
for (; m < chunk; m++)
di[m] = si[m] + t[m];
}
}
}