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/* nlmeans_x86.c
Copyright (c) 2013 Dirk Farin
Copyright (c) 2003-2015 HandBrake Team
This file is part of the HandBrake source code
Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License v2.
For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
#include <emmintrin.h>
#include "hb.h"
#include "libavutil/cpu.h"
#include "nlmeans.h"
static void build_integral_sse2(uint32_t *integral,
int integral_stride,
const uint8_t *src,
const uint8_t *src_pre,
int src_w,
const uint8_t *compare,
const uint8_t *compare_pre,
int compare_w,
int w,
int h,
int dx,
int dy)
{
const __m128i zero = _mm_set1_epi8(0);
for (int y = 0; y < h; y++)
{
__m128i prevadd = _mm_set1_epi32(0);
const uint8_t *p1 = src_pre + y*src_w;
const uint8_t *p2 = compare_pre + (y+dy)*compare_w + dx;
uint32_t *out = integral + (y*integral_stride);
for (int x = 0; x < w; x += 16)
{
__m128i pa, pb;
__m128i pla, plb;
__m128i ldiff, lldiff, lhdiff;
__m128i ltmp,htmp;
__m128i ladd,hadd;
__m128i pha,phb;
__m128i hdiff,hldiff,hhdiff;
__m128i l2tmp,h2tmp;
pa = _mm_loadu_si128((__m128i*)p1); // Load source pixels into register 1
pb = _mm_loadu_si128((__m128i*)p2); // Load compare pixels into register 2
// Low
pla = _mm_unpacklo_epi8(pa,zero); // Unpack and interleave source low with zeros
plb = _mm_unpacklo_epi8(pb,zero); // Unpack and interleave compare low with zeros
ldiff = _mm_sub_epi16(pla,plb); // Diff source and compare lows (subtract)
ldiff = _mm_mullo_epi16(ldiff,ldiff); // Square low diff (multiply at 32-bit precision)
lldiff = _mm_unpacklo_epi16(ldiff,zero); // Unpack and interleave diff low with zeros
lhdiff = _mm_unpackhi_epi16(ldiff,zero); // Unpack and interleave diff high with zeros
ltmp = _mm_slli_si128(lldiff, 4); // Temp shift diff low left 4 bytes
lldiff = _mm_add_epi32(lldiff, ltmp); // Add above to diff low
ltmp = _mm_slli_si128(lldiff, 8); // Temp shift diff low left 8 bytes
lldiff = _mm_add_epi32(lldiff, ltmp); // Add above to diff low
lldiff = _mm_add_epi32(lldiff, prevadd); // Add previous total to diff low
ladd = _mm_shuffle_epi32(lldiff, 0xff); // Shuffle diff low
htmp = _mm_slli_si128(lhdiff, 4); // Temp shift diff high left 4 bytes
lhdiff = _mm_add_epi32(lhdiff, htmp); // Add above to diff high
htmp = _mm_slli_si128(lhdiff, 8); // Temp shift diff high left 8 bytes
lhdiff = _mm_add_epi32(lhdiff, htmp); // Add above to diff high
lhdiff = _mm_add_epi32(lhdiff, ladd); // Add shuffled diff low to diff high
prevadd = _mm_shuffle_epi32(lhdiff, 0xff); // Shuffle diff high
// High
pha = _mm_unpackhi_epi8(pa,zero); // Unpack and interleave source high with zeros
phb = _mm_unpackhi_epi8(pb,zero); // Unpack and interleave compare high with zeros
hdiff = _mm_sub_epi16(pha,phb); // Diff source and compare highs (subtract)
hdiff = _mm_mullo_epi16(hdiff,hdiff); // Square high diff (multiply at 32-bit precision)
hldiff = _mm_unpacklo_epi16(hdiff,zero); // Unpack and interleave diff low with zeros
hhdiff = _mm_unpackhi_epi16(hdiff,zero); // Unpack and interleave diff high with zeros
l2tmp = _mm_slli_si128(hldiff, 4); // Temp shift diff low 4 bytes
hldiff = _mm_add_epi32(hldiff, l2tmp); // Add above to diff low
l2tmp = _mm_slli_si128(hldiff, 8); // Temp shift diff low left 8 bytes
hldiff = _mm_add_epi32(hldiff, l2tmp); // Add above to diff low
hldiff = _mm_add_epi32(hldiff, prevadd); // Add previous total to diff low
hadd = _mm_shuffle_epi32(hldiff, 0xff); // Shuffle diff low
h2tmp = _mm_slli_si128(hhdiff, 4); // Temp shift diff high left 4 bytes
hhdiff = _mm_add_epi32(hhdiff, h2tmp); // Add above to diff high
h2tmp = _mm_slli_si128(hhdiff, 8); // Temp shift diff high left 8 bytes
hhdiff = _mm_add_epi32(hhdiff, h2tmp); // Add above to diff high
hhdiff = _mm_add_epi32(hhdiff, hadd); // Add shuffled diff low to diff high
prevadd = _mm_shuffle_epi32(hhdiff, 0xff); // Shuffle diff high
// Store
_mm_store_si128((__m128i*)(out), lldiff); // Store low diff low in memory
_mm_store_si128((__m128i*)(out+4), lhdiff); // Store low diff high in memory
_mm_store_si128((__m128i*)(out+8), hldiff); // Store high diff low in memory
_mm_store_si128((__m128i*)(out+12), hhdiff); // Store high diff high in memory
// Increment
out += 16;
p1 += 16;
p2 += 16;
}
if (y > 0)
{
out = integral + y*integral_stride;
for (int x = 0; x < w; x += 16)
{
*((__m128i*)out) = _mm_add_epi32(*(__m128i*)(out-integral_stride),
*(__m128i*)(out));
*((__m128i*)(out+4)) = _mm_add_epi32(*(__m128i*)(out+4-integral_stride),
*(__m128i*)(out+4));
*((__m128i*)(out+8)) = _mm_add_epi32(*(__m128i*)(out+8-integral_stride),
*(__m128i*)(out+8));
*((__m128i*)(out+12)) = _mm_add_epi32(*(__m128i*)(out+12-integral_stride),
*(__m128i*)(out+12));
out += 16;
}
}
}
}
void nlmeans_init_x86(NLMeansFunctions *functions)
{
if (av_get_cpu_flags() & AV_CPU_FLAG_SSE2)
{
functions->build_integral = build_integral_sse2;
hb_log("NLMeans using SSE2 optimizations");
}
}
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