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vpx/vpx_dsp/x86/highbd_intrapred_intrin_sse2.c
Scott LaVarnway 3bbd62ed27 vpxdsp: [x86] add highbd_d135_predictor functions 
C vs SSE2 speed gains:
_4x4 : ~1.81x

C vs SSSE3 speed gains:
_8x8 : ~1.96x
_16x16 : ~1.88x
_32x32 : ~2.02x

BUG=webm:1411

Change-Id: Iefaf8b39afbbfe34c1ad1d21e3a003b20f1f61e0
2017-09-29 08:56:38 -07:00

534 lines
21 KiB
C
Raw Blame History

/*
* Copyright (c) 2017 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <emmintrin.h> // SSE2
#include "./vpx_config.h"
#include "./vpx_dsp_rtcd.h"
#include "vpx/vpx_integer.h"
// -----------------------------------------------------------------------------
void vpx_highbd_h_predictor_4x4_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i left_u16 = _mm_loadl_epi64((const __m128i *)left);
const __m128i row0 = _mm_shufflelo_epi16(left_u16, 0x0);
const __m128i row1 = _mm_shufflelo_epi16(left_u16, 0x55);
const __m128i row2 = _mm_shufflelo_epi16(left_u16, 0xaa);
const __m128i row3 = _mm_shufflelo_epi16(left_u16, 0xff);
(void)above;
(void)bd;
_mm_storel_epi64((__m128i *)dst, row0);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row1);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row2);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row3);
}
void vpx_highbd_h_predictor_8x8_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i left_u16 = _mm_load_si128((const __m128i *)left);
const __m128i row0 = _mm_shufflelo_epi16(left_u16, 0x0);
const __m128i row1 = _mm_shufflelo_epi16(left_u16, 0x55);
const __m128i row2 = _mm_shufflelo_epi16(left_u16, 0xaa);
const __m128i row3 = _mm_shufflelo_epi16(left_u16, 0xff);
const __m128i row4 = _mm_shufflehi_epi16(left_u16, 0x0);
const __m128i row5 = _mm_shufflehi_epi16(left_u16, 0x55);
const __m128i row6 = _mm_shufflehi_epi16(left_u16, 0xaa);
const __m128i row7 = _mm_shufflehi_epi16(left_u16, 0xff);
(void)above;
(void)bd;
_mm_store_si128((__m128i *)dst, _mm_unpacklo_epi64(row0, row0));
dst += stride;
_mm_store_si128((__m128i *)dst, _mm_unpacklo_epi64(row1, row1));
dst += stride;
_mm_store_si128((__m128i *)dst, _mm_unpacklo_epi64(row2, row2));
dst += stride;
_mm_store_si128((__m128i *)dst, _mm_unpacklo_epi64(row3, row3));
dst += stride;
_mm_store_si128((__m128i *)dst, _mm_unpackhi_epi64(row4, row4));
dst += stride;
_mm_store_si128((__m128i *)dst, _mm_unpackhi_epi64(row5, row5));
dst += stride;
_mm_store_si128((__m128i *)dst, _mm_unpackhi_epi64(row6, row6));
dst += stride;
_mm_store_si128((__m128i *)dst, _mm_unpackhi_epi64(row7, row7));
}
static INLINE void h_store_16_unpacklo(uint16_t **dst, const ptrdiff_t stride,
const __m128i *row) {
const __m128i val = _mm_unpacklo_epi64(*row, *row);
_mm_store_si128((__m128i *)*dst, val);
_mm_store_si128((__m128i *)(*dst + 8), val);
*dst += stride;
}
static INLINE void h_store_16_unpackhi(uint16_t **dst, const ptrdiff_t stride,
const __m128i *row) {
const __m128i val = _mm_unpackhi_epi64(*row, *row);
_mm_store_si128((__m128i *)(*dst), val);
_mm_store_si128((__m128i *)(*dst + 8), val);
*dst += stride;
}
void vpx_highbd_h_predictor_16x16_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
int i;
(void)above;
(void)bd;
for (i = 0; i < 2; i++, left += 8) {
const __m128i left_u16 = _mm_load_si128((const __m128i *)left);
const __m128i row0 = _mm_shufflelo_epi16(left_u16, 0x0);
const __m128i row1 = _mm_shufflelo_epi16(left_u16, 0x55);
const __m128i row2 = _mm_shufflelo_epi16(left_u16, 0xaa);
const __m128i row3 = _mm_shufflelo_epi16(left_u16, 0xff);
const __m128i row4 = _mm_shufflehi_epi16(left_u16, 0x0);
const __m128i row5 = _mm_shufflehi_epi16(left_u16, 0x55);
const __m128i row6 = _mm_shufflehi_epi16(left_u16, 0xaa);
const __m128i row7 = _mm_shufflehi_epi16(left_u16, 0xff);
h_store_16_unpacklo(&dst, stride, &row0);
h_store_16_unpacklo(&dst, stride, &row1);
h_store_16_unpacklo(&dst, stride, &row2);
h_store_16_unpacklo(&dst, stride, &row3);
h_store_16_unpackhi(&dst, stride, &row4);
h_store_16_unpackhi(&dst, stride, &row5);
h_store_16_unpackhi(&dst, stride, &row6);
h_store_16_unpackhi(&dst, stride, &row7);
}
}
static INLINE void h_store_32_unpacklo(uint16_t **dst, const ptrdiff_t stride,
const __m128i *row) {
const __m128i val = _mm_unpacklo_epi64(*row, *row);
_mm_store_si128((__m128i *)(*dst), val);
_mm_store_si128((__m128i *)(*dst + 8), val);
_mm_store_si128((__m128i *)(*dst + 16), val);
_mm_store_si128((__m128i *)(*dst + 24), val);
*dst += stride;
}
static INLINE void h_store_32_unpackhi(uint16_t **dst, const ptrdiff_t stride,
const __m128i *row) {
const __m128i val = _mm_unpackhi_epi64(*row, *row);
_mm_store_si128((__m128i *)(*dst), val);
_mm_store_si128((__m128i *)(*dst + 8), val);
_mm_store_si128((__m128i *)(*dst + 16), val);
_mm_store_si128((__m128i *)(*dst + 24), val);
*dst += stride;
}
void vpx_highbd_h_predictor_32x32_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
int i;
(void)above;
(void)bd;
for (i = 0; i < 4; i++, left += 8) {
const __m128i left_u16 = _mm_load_si128((const __m128i *)left);
const __m128i row0 = _mm_shufflelo_epi16(left_u16, 0x0);
const __m128i row1 = _mm_shufflelo_epi16(left_u16, 0x55);
const __m128i row2 = _mm_shufflelo_epi16(left_u16, 0xaa);
const __m128i row3 = _mm_shufflelo_epi16(left_u16, 0xff);
const __m128i row4 = _mm_shufflehi_epi16(left_u16, 0x0);
const __m128i row5 = _mm_shufflehi_epi16(left_u16, 0x55);
const __m128i row6 = _mm_shufflehi_epi16(left_u16, 0xaa);
const __m128i row7 = _mm_shufflehi_epi16(left_u16, 0xff);
h_store_32_unpacklo(&dst, stride, &row0);
h_store_32_unpacklo(&dst, stride, &row1);
h_store_32_unpacklo(&dst, stride, &row2);
h_store_32_unpacklo(&dst, stride, &row3);
h_store_32_unpackhi(&dst, stride, &row4);
h_store_32_unpackhi(&dst, stride, &row5);
h_store_32_unpackhi(&dst, stride, &row6);
h_store_32_unpackhi(&dst, stride, &row7);
}
}
//------------------------------------------------------------------------------
// DC 4x4
static INLINE __m128i dc_sum_4(const uint16_t *ref) {
const __m128i _dcba = _mm_loadl_epi64((const __m128i *)ref);
const __m128i _xxdc = _mm_shufflelo_epi16(_dcba, 0xe);
const __m128i a = _mm_add_epi16(_dcba, _xxdc);
return _mm_add_epi16(a, _mm_shufflelo_epi16(a, 0x1));
}
static INLINE void dc_store_4x4(uint16_t *dst, ptrdiff_t stride,
const __m128i *dc) {
const __m128i dc_dup = _mm_shufflelo_epi16(*dc, 0x0);
int i;
for (i = 0; i < 4; ++i, dst += stride) {
_mm_storel_epi64((__m128i *)dst, dc_dup);
}
}
void vpx_highbd_dc_left_predictor_4x4_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i two = _mm_cvtsi32_si128(2);
const __m128i sum = dc_sum_4(left);
const __m128i dc = _mm_srli_epi16(_mm_add_epi16(sum, two), 2);
(void)above;
(void)bd;
dc_store_4x4(dst, stride, &dc);
}
void vpx_highbd_dc_top_predictor_4x4_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i two = _mm_cvtsi32_si128(2);
const __m128i sum = dc_sum_4(above);
const __m128i dc = _mm_srli_epi16(_mm_add_epi16(sum, two), 2);
(void)left;
(void)bd;
dc_store_4x4(dst, stride, &dc);
}
void vpx_highbd_dc_128_predictor_4x4_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i dc = _mm_cvtsi32_si128(1 << (bd - 1));
const __m128i dc_dup = _mm_shufflelo_epi16(dc, 0x0);
(void)above;
(void)left;
dc_store_4x4(dst, stride, &dc_dup);
}
//------------------------------------------------------------------------------
// DC 8x8
static INLINE __m128i dc_sum_8(const uint16_t *ref) {
const __m128i ref_u16 = _mm_load_si128((const __m128i *)ref);
const __m128i _dcba = _mm_add_epi16(ref_u16, _mm_srli_si128(ref_u16, 8));
const __m128i _xxdc = _mm_shufflelo_epi16(_dcba, 0xe);
const __m128i a = _mm_add_epi16(_dcba, _xxdc);
return _mm_add_epi16(a, _mm_shufflelo_epi16(a, 0x1));
}
static INLINE void dc_store_8x8(uint16_t *dst, ptrdiff_t stride,
const __m128i *dc) {
const __m128i dc_dup_lo = _mm_shufflelo_epi16(*dc, 0);
const __m128i dc_dup = _mm_unpacklo_epi64(dc_dup_lo, dc_dup_lo);
int i;
for (i = 0; i < 8; ++i, dst += stride) {
_mm_store_si128((__m128i *)dst, dc_dup);
}
}
void vpx_highbd_dc_left_predictor_8x8_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i four = _mm_cvtsi32_si128(4);
const __m128i sum = dc_sum_8(left);
const __m128i dc = _mm_srli_epi16(_mm_add_epi16(sum, four), 3);
(void)above;
(void)bd;
dc_store_8x8(dst, stride, &dc);
}
void vpx_highbd_dc_top_predictor_8x8_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i four = _mm_cvtsi32_si128(4);
const __m128i sum = dc_sum_8(above);
const __m128i dc = _mm_srli_epi16(_mm_add_epi16(sum, four), 3);
(void)left;
(void)bd;
dc_store_8x8(dst, stride, &dc);
}
void vpx_highbd_dc_128_predictor_8x8_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i dc = _mm_cvtsi32_si128(1 << (bd - 1));
const __m128i dc_dup = _mm_shufflelo_epi16(dc, 0x0);
(void)above;
(void)left;
dc_store_8x8(dst, stride, &dc_dup);
}
//------------------------------------------------------------------------------
// DC 16x16
static INLINE __m128i dc_sum_16(const uint16_t *ref) {
const __m128i sum_lo = dc_sum_8(ref);
const __m128i sum_hi = dc_sum_8(ref + 8);
return _mm_add_epi16(sum_lo, sum_hi);
}
static INLINE void dc_store_16x16(uint16_t *dst, ptrdiff_t stride,
const __m128i *dc) {
const __m128i dc_dup_lo = _mm_shufflelo_epi16(*dc, 0);
const __m128i dc_dup = _mm_unpacklo_epi64(dc_dup_lo, dc_dup_lo);
int i;
for (i = 0; i < 16; ++i, dst += stride) {
_mm_store_si128((__m128i *)dst, dc_dup);
_mm_store_si128((__m128i *)(dst + 8), dc_dup);
}
}
void vpx_highbd_dc_left_predictor_16x16_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i eight = _mm_cvtsi32_si128(8);
const __m128i sum = dc_sum_16(left);
const __m128i dc = _mm_srli_epi16(_mm_add_epi16(sum, eight), 4);
(void)above;
(void)bd;
dc_store_16x16(dst, stride, &dc);
}
void vpx_highbd_dc_top_predictor_16x16_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i eight = _mm_cvtsi32_si128(8);
const __m128i sum = dc_sum_16(above);
const __m128i dc = _mm_srli_epi16(_mm_add_epi16(sum, eight), 4);
(void)left;
(void)bd;
dc_store_16x16(dst, stride, &dc);
}
void vpx_highbd_dc_128_predictor_16x16_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i dc = _mm_cvtsi32_si128(1 << (bd - 1));
const __m128i dc_dup = _mm_shufflelo_epi16(dc, 0x0);
(void)above;
(void)left;
dc_store_16x16(dst, stride, &dc_dup);
}
//------------------------------------------------------------------------------
// DC 32x32
static INLINE __m128i dc_sum_32(const uint16_t *ref) {
const __m128i zero = _mm_setzero_si128();
const __m128i sum_a = dc_sum_16(ref);
const __m128i sum_b = dc_sum_16(ref + 16);
// 12 bit bd will outrange, so expand to 32 bit before adding final total
return _mm_add_epi32(_mm_unpacklo_epi16(sum_a, zero),
_mm_unpacklo_epi16(sum_b, zero));
}
static INLINE void dc_store_32x32(uint16_t *dst, ptrdiff_t stride,
const __m128i *dc) {
const __m128i dc_dup_lo = _mm_shufflelo_epi16(*dc, 0);
const __m128i dc_dup = _mm_unpacklo_epi64(dc_dup_lo, dc_dup_lo);
int i;
for (i = 0; i < 32; ++i, dst += stride) {
_mm_store_si128((__m128i *)dst, dc_dup);
_mm_store_si128((__m128i *)(dst + 8), dc_dup);
_mm_store_si128((__m128i *)(dst + 16), dc_dup);
_mm_store_si128((__m128i *)(dst + 24), dc_dup);
}
}
void vpx_highbd_dc_left_predictor_32x32_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i sixteen = _mm_cvtsi32_si128(16);
const __m128i sum = dc_sum_32(left);
const __m128i dc = _mm_srli_epi32(_mm_add_epi32(sum, sixteen), 5);
(void)above;
(void)bd;
dc_store_32x32(dst, stride, &dc);
}
void vpx_highbd_dc_top_predictor_32x32_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i sixteen = _mm_cvtsi32_si128(16);
const __m128i sum = dc_sum_32(above);
const __m128i dc = _mm_srli_epi32(_mm_add_epi32(sum, sixteen), 5);
(void)left;
(void)bd;
dc_store_32x32(dst, stride, &dc);
}
void vpx_highbd_dc_128_predictor_32x32_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i dc = _mm_cvtsi32_si128(1 << (bd - 1));
const __m128i dc_dup = _mm_shufflelo_epi16(dc, 0x0);
(void)above;
(void)left;
dc_store_32x32(dst, stride, &dc_dup);
}
// -----------------------------------------------------------------------------
/*
; ------------------------------------------
; input: x, y, z, result
;
; trick from pascal
; (x+2y+z+2)>>2 can be calculated as:
; result = avg(x,z)
; result -= xor(x,z) & 1
; result = avg(result,y)
; ------------------------------------------
*/
static INLINE __m128i avg3_epu16(const __m128i *x, const __m128i *y,
const __m128i *z) {
const __m128i one = _mm_set1_epi16(1);
const __m128i a = _mm_avg_epu16(*x, *z);
const __m128i b =
_mm_subs_epu16(a, _mm_and_si128(_mm_xor_si128(*x, *z), one));
return _mm_avg_epu16(b, *y);
}
void vpx_highbd_d117_predictor_4x4_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const int I = left[0];
const int J = left[1];
const int K = left[2];
const __m128i XXXXABCD = _mm_loadu_si128((const __m128i *)(above - 4));
const __m128i KXXXABCD = _mm_insert_epi16(XXXXABCD, K, 0);
const __m128i KJXXABCD = _mm_insert_epi16(KXXXABCD, J, 1);
const __m128i KJIXABCD = _mm_insert_epi16(KJXXABCD, I, 2);
const __m128i JIXABCD0 = _mm_srli_si128(KJIXABCD, 2);
const __m128i IXABCD00 = _mm_srli_si128(KJIXABCD, 4);
const __m128i avg2 = _mm_avg_epu16(KJIXABCD, JIXABCD0);
const __m128i avg3 = avg3_epu16(&KJIXABCD, &JIXABCD0, &IXABCD00);
const __m128i row0 = _mm_srli_si128(avg2, 6);
const __m128i row1 = _mm_srli_si128(avg3, 4);
const __m128i row2 = _mm_srli_si128(avg2, 4);
const __m128i row3 = _mm_srli_si128(avg3, 2);
(void)bd;
_mm_storel_epi64((__m128i *)dst, row0);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row1);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row2);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row3);
dst -= stride;
dst[0] = _mm_extract_epi16(avg3, 1);
dst[stride] = _mm_extract_epi16(avg3, 0);
}
void vpx_highbd_d135_predictor_4x4_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const int I = left[0];
const int J = left[1];
const int K = left[2];
const int L = left[3];
const __m128i XXXXABCD = _mm_loadu_si128((const __m128i *)(above - 4));
const __m128i KXXXABCD = _mm_insert_epi16(XXXXABCD, K, 0);
const __m128i KJXXABCD = _mm_insert_epi16(KXXXABCD, J, 1);
const __m128i KJIXABCD = _mm_insert_epi16(KJXXABCD, I, 2);
const __m128i JIXABCD0 = _mm_srli_si128(KJIXABCD, 2);
const __m128i LKJIXABC = _mm_insert_epi16(_mm_slli_si128(KJIXABCD, 2), L, 0);
const __m128i avg3 = avg3_epu16(&JIXABCD0, &KJIXABCD, &LKJIXABC);
const __m128i row0 = _mm_srli_si128(avg3, 6);
const __m128i row1 = _mm_srli_si128(avg3, 4);
const __m128i row2 = _mm_srli_si128(avg3, 2);
const __m128i row3 = avg3;
(void)bd;
_mm_storel_epi64((__m128i *)dst, row0);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row1);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row2);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row3);
}
void vpx_highbd_d153_predictor_4x4_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const int I = left[0];
const int J = left[1];
const int K = left[2];
const int L = left[3];
const __m128i XXXXXABC = _mm_loadu_si128((const __m128i *)(above - 5));
const __m128i LXXXXABC = _mm_insert_epi16(XXXXXABC, L, 0);
const __m128i LKXXXABC = _mm_insert_epi16(LXXXXABC, K, 1);
const __m128i LKJXXABC = _mm_insert_epi16(LKXXXABC, J, 2);
const __m128i LKJIXABC = _mm_insert_epi16(LKJXXABC, I, 3);
const __m128i KJIXABC0 = _mm_srli_si128(LKJIXABC, 2);
const __m128i JIXABC00 = _mm_srli_si128(LKJIXABC, 4);
const __m128i avg3 = avg3_epu16(&LKJIXABC, &KJIXABC0, &JIXABC00);
const __m128i avg2 = _mm_avg_epu16(LKJIXABC, KJIXABC0);
const __m128i row3 = _mm_unpacklo_epi16(avg2, avg3);
const __m128i row2 = _mm_srli_si128(row3, 4);
const __m128i row1 = _mm_srli_si128(row3, 8);
const __m128i row0 = _mm_srli_si128(avg3, 4);
(void)bd;
_mm_storel_epi64((__m128i *)dst, row0);
dst[0] = _mm_extract_epi16(avg2, 3);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row1);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row2);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row3);
}
void vpx_highbd_d207_predictor_4x4_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i IJKL0000 = _mm_load_si128((const __m128i *)left);
const __m128i LLLL0000 = _mm_shufflelo_epi16(IJKL0000, 0xff);
const __m128i IJKLLLLL = _mm_unpacklo_epi64(IJKL0000, LLLL0000);
const __m128i JKLLLLL0 = _mm_srli_si128(IJKLLLLL, 2);
const __m128i KLLLLL00 = _mm_srli_si128(IJKLLLLL, 4);
const __m128i avg3 = avg3_epu16(&IJKLLLLL, &JKLLLLL0, &KLLLLL00);
const __m128i avg2 = _mm_avg_epu16(IJKLLLLL, JKLLLLL0);
const __m128i row0 = _mm_unpacklo_epi16(avg2, avg3);
const __m128i row1 = _mm_srli_si128(row0, 4);
const __m128i row2 = _mm_srli_si128(row0, 8);
const __m128i row3 = LLLL0000;
(void)above;
(void)bd;
_mm_storel_epi64((__m128i *)dst, row0);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row1);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row2);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row3);
}
void vpx_highbd_d63_predictor_4x4_sse2(uint16_t *dst, ptrdiff_t stride,
const uint16_t *above,
const uint16_t *left, int bd) {
const __m128i ABCDEFGH = _mm_loadu_si128((const __m128i *)above);
const __m128i BCDEFGH0 = _mm_srli_si128(ABCDEFGH, 2);
const __m128i CDEFGH00 = _mm_srli_si128(ABCDEFGH, 4);
const __m128i avg3 = avg3_epu16(&ABCDEFGH, &BCDEFGH0, &CDEFGH00);
const __m128i avg2 = _mm_avg_epu16(ABCDEFGH, BCDEFGH0);
const __m128i row0 = avg2;
const __m128i row1 = avg3;
const __m128i row2 = _mm_srli_si128(avg2, 2);
const __m128i row3 = _mm_srli_si128(avg3, 2);
(void)left;
(void)bd;
_mm_storel_epi64((__m128i *)dst, row0);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row1);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row2);
dst += stride;
_mm_storel_epi64((__m128i *)dst, row3);
}
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