Commit 48b08913 authored by Jingning Han's avatar Jingning Han
Browse files

Inverse 16x16 2D-DCT SSSE3 implementation

This commit enables the SSSE3 implementation of full inverse 16x16
2D-DCT. The unit runtime goes down from 1642 cycles to 1519 cycles,
about 7% speed-up.

Change-Id: I14d2fdf9da1fb4ed1e5db7ce24f77a1bfc8ea90d
parent 76bf6813
......@@ -356,7 +356,7 @@ specialize qw/vp9_idct16x16_1_add sse2 neon_asm dspr2/;
$vp9_idct16x16_1_add_neon_asm=vp9_idct16x16_1_add_neon;
add_proto qw/void vp9_idct16x16_256_add/, "const int16_t *input, uint8_t *dest, int dest_stride";
specialize qw/vp9_idct16x16_256_add sse2 neon_asm dspr2/;
specialize qw/vp9_idct16x16_256_add sse2 ssse3 neon_asm dspr2/;
$vp9_idct16x16_256_add_neon_asm=vp9_idct16x16_256_add_neon;
add_proto qw/void vp9_idct16x16_10_add/, "const int16_t *input, uint8_t *dest, int dest_stride";
......
......@@ -8,12 +8,7 @@
* be found in the AUTHORS file in the root of the source tree.
*/
#include <assert.h>
#include <emmintrin.h> // SSE2
#include "./vpx_config.h"
#include "vpx/vpx_integer.h"
#include "vp9/common/vp9_common.h"
#include "vp9/common/vp9_idct.h"
#include "vp9/common/x86/vp9_idct_intrin_sse2.h"
#define RECON_AND_STORE4X4(dest, in_x) \
{ \
......@@ -527,16 +522,6 @@ void vp9_iht4x4_16_add_sse2(const int16_t *input, uint8_t *dest, int stride,
out7 = _mm_subs_epi16(stp1_0, stp2_7); \
}
#define RECON_AND_STORE(dest, in_x) \
{ \
__m128i d0 = _mm_loadl_epi64((__m128i *)(dest)); \
d0 = _mm_unpacklo_epi8(d0, zero); \
d0 = _mm_add_epi16(in_x, d0); \
d0 = _mm_packus_epi16(d0, d0); \
_mm_storel_epi64((__m128i *)(dest), d0); \
dest += stride; \
}
void vp9_idct8x8_64_add_sse2(const int16_t *input, uint8_t *dest, int stride) {
const __m128i zero = _mm_setzero_si128();
const __m128i rounding = _mm_set1_epi32(DCT_CONST_ROUNDING);
......@@ -627,36 +612,6 @@ void vp9_idct8x8_1_add_sse2(const int16_t *input, uint8_t *dest, int stride) {
RECON_AND_STORE(dest, dc_value);
}
// perform 8x8 transpose
static INLINE void array_transpose_8x8(__m128i *in, __m128i *res) {
const __m128i tr0_0 = _mm_unpacklo_epi16(in[0], in[1]);
const __m128i tr0_1 = _mm_unpacklo_epi16(in[2], in[3]);
const __m128i tr0_2 = _mm_unpackhi_epi16(in[0], in[1]);
const __m128i tr0_3 = _mm_unpackhi_epi16(in[2], in[3]);
const __m128i tr0_4 = _mm_unpacklo_epi16(in[4], in[5]);
const __m128i tr0_5 = _mm_unpacklo_epi16(in[6], in[7]);
const __m128i tr0_6 = _mm_unpackhi_epi16(in[4], in[5]);
const __m128i tr0_7 = _mm_unpackhi_epi16(in[6], in[7]);
const __m128i tr1_0 = _mm_unpacklo_epi32(tr0_0, tr0_1);
const __m128i tr1_1 = _mm_unpacklo_epi32(tr0_4, tr0_5);
const __m128i tr1_2 = _mm_unpackhi_epi32(tr0_0, tr0_1);
const __m128i tr1_3 = _mm_unpackhi_epi32(tr0_4, tr0_5);
const __m128i tr1_4 = _mm_unpacklo_epi32(tr0_2, tr0_3);
const __m128i tr1_5 = _mm_unpacklo_epi32(tr0_6, tr0_7);
const __m128i tr1_6 = _mm_unpackhi_epi32(tr0_2, tr0_3);
const __m128i tr1_7 = _mm_unpackhi_epi32(tr0_6, tr0_7);
res[0] = _mm_unpacklo_epi64(tr1_0, tr1_1);
res[1] = _mm_unpackhi_epi64(tr1_0, tr1_1);
res[2] = _mm_unpacklo_epi64(tr1_2, tr1_3);
res[3] = _mm_unpackhi_epi64(tr1_2, tr1_3);
res[4] = _mm_unpacklo_epi64(tr1_4, tr1_5);
res[5] = _mm_unpackhi_epi64(tr1_4, tr1_5);
res[6] = _mm_unpacklo_epi64(tr1_6, tr1_7);
res[7] = _mm_unpackhi_epi64(tr1_6, tr1_7);
}
static INLINE void array_transpose_4X8(__m128i *in, __m128i * out) {
const __m128i tr0_0 = _mm_unpacklo_epi16(in[0], in[1]);
const __m128i tr0_1 = _mm_unpacklo_epi16(in[2], in[3]);
......@@ -1573,23 +1528,6 @@ void vp9_idct16x16_1_add_sse2(const int16_t *input, uint8_t *dest, int stride) {
}
}
static INLINE void array_transpose_16x16(__m128i *res0, __m128i *res1) {
__m128i tbuf[8];
array_transpose_8x8(res0, res0);
array_transpose_8x8(res1, tbuf);
array_transpose_8x8(res0 + 8, res1);
array_transpose_8x8(res1 + 8, res1 + 8);
res0[8] = tbuf[0];
res0[9] = tbuf[1];
res0[10] = tbuf[2];
res0[11] = tbuf[3];
res0[12] = tbuf[4];
res0[13] = tbuf[5];
res0[14] = tbuf[6];
res0[15] = tbuf[7];
}
static void iadst16_8col(__m128i *in) {
// perform 16x16 1-D ADST for 8 columns
__m128i s[16], x[16], u[32], v[32];
......@@ -2416,82 +2354,6 @@ static void iadst16_sse2(__m128i *in0, __m128i *in1) {
iadst16_8col(in1);
}
static INLINE void load_buffer_8x16(const int16_t *input, __m128i *in) {
in[0] = _mm_load_si128((const __m128i *)(input + 0 * 16));
in[1] = _mm_load_si128((const __m128i *)(input + 1 * 16));
in[2] = _mm_load_si128((const __m128i *)(input + 2 * 16));
in[3] = _mm_load_si128((const __m128i *)(input + 3 * 16));
in[4] = _mm_load_si128((const __m128i *)(input + 4 * 16));
in[5] = _mm_load_si128((const __m128i *)(input + 5 * 16));
in[6] = _mm_load_si128((const __m128i *)(input + 6 * 16));
in[7] = _mm_load_si128((const __m128i *)(input + 7 * 16));
in[8] = _mm_load_si128((const __m128i *)(input + 8 * 16));
in[9] = _mm_load_si128((const __m128i *)(input + 9 * 16));
in[10] = _mm_load_si128((const __m128i *)(input + 10 * 16));
in[11] = _mm_load_si128((const __m128i *)(input + 11 * 16));
in[12] = _mm_load_si128((const __m128i *)(input + 12 * 16));
in[13] = _mm_load_si128((const __m128i *)(input + 13 * 16));
in[14] = _mm_load_si128((const __m128i *)(input + 14 * 16));
in[15] = _mm_load_si128((const __m128i *)(input + 15 * 16));
}
static INLINE void write_buffer_8x16(uint8_t *dest, __m128i *in, int stride) {
const __m128i final_rounding = _mm_set1_epi16(1<<5);
const __m128i zero = _mm_setzero_si128();
// Final rounding and shift
in[0] = _mm_adds_epi16(in[0], final_rounding);
in[1] = _mm_adds_epi16(in[1], final_rounding);
in[2] = _mm_adds_epi16(in[2], final_rounding);
in[3] = _mm_adds_epi16(in[3], final_rounding);
in[4] = _mm_adds_epi16(in[4], final_rounding);
in[5] = _mm_adds_epi16(in[5], final_rounding);
in[6] = _mm_adds_epi16(in[6], final_rounding);
in[7] = _mm_adds_epi16(in[7], final_rounding);
in[8] = _mm_adds_epi16(in[8], final_rounding);
in[9] = _mm_adds_epi16(in[9], final_rounding);
in[10] = _mm_adds_epi16(in[10], final_rounding);
in[11] = _mm_adds_epi16(in[11], final_rounding);
in[12] = _mm_adds_epi16(in[12], final_rounding);
in[13] = _mm_adds_epi16(in[13], final_rounding);
in[14] = _mm_adds_epi16(in[14], final_rounding);
in[15] = _mm_adds_epi16(in[15], final_rounding);
in[0] = _mm_srai_epi16(in[0], 6);
in[1] = _mm_srai_epi16(in[1], 6);
in[2] = _mm_srai_epi16(in[2], 6);
in[3] = _mm_srai_epi16(in[3], 6);
in[4] = _mm_srai_epi16(in[4], 6);
in[5] = _mm_srai_epi16(in[5], 6);
in[6] = _mm_srai_epi16(in[6], 6);
in[7] = _mm_srai_epi16(in[7], 6);
in[8] = _mm_srai_epi16(in[8], 6);
in[9] = _mm_srai_epi16(in[9], 6);
in[10] = _mm_srai_epi16(in[10], 6);
in[11] = _mm_srai_epi16(in[11], 6);
in[12] = _mm_srai_epi16(in[12], 6);
in[13] = _mm_srai_epi16(in[13], 6);
in[14] = _mm_srai_epi16(in[14], 6);
in[15] = _mm_srai_epi16(in[15], 6);
RECON_AND_STORE(dest, in[0]);
RECON_AND_STORE(dest, in[1]);
RECON_AND_STORE(dest, in[2]);
RECON_AND_STORE(dest, in[3]);
RECON_AND_STORE(dest, in[4]);
RECON_AND_STORE(dest, in[5]);
RECON_AND_STORE(dest, in[6]);
RECON_AND_STORE(dest, in[7]);
RECON_AND_STORE(dest, in[8]);
RECON_AND_STORE(dest, in[9]);
RECON_AND_STORE(dest, in[10]);
RECON_AND_STORE(dest, in[11]);
RECON_AND_STORE(dest, in[12]);
RECON_AND_STORE(dest, in[13]);
RECON_AND_STORE(dest, in[14]);
RECON_AND_STORE(dest, in[15]);
}
void vp9_iht16x16_256_add_sse2(const int16_t *input, uint8_t *dest, int stride,
int tx_type) {
__m128i in0[16], in1[16];
......
/*
* Copyright (c) 2014 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 <assert.h>
#include <emmintrin.h> // SSE2
#include "./vpx_config.h"
#include "vpx/vpx_integer.h"
#include "vp9/common/vp9_common.h"
#include "vp9/common/vp9_idct.h"
// perform 8x8 transpose
static INLINE void array_transpose_8x8(__m128i *in, __m128i *res) {
const __m128i tr0_0 = _mm_unpacklo_epi16(in[0], in[1]);
const __m128i tr0_1 = _mm_unpacklo_epi16(in[2], in[3]);
const __m128i tr0_2 = _mm_unpackhi_epi16(in[0], in[1]);
const __m128i tr0_3 = _mm_unpackhi_epi16(in[2], in[3]);
const __m128i tr0_4 = _mm_unpacklo_epi16(in[4], in[5]);
const __m128i tr0_5 = _mm_unpacklo_epi16(in[6], in[7]);
const __m128i tr0_6 = _mm_unpackhi_epi16(in[4], in[5]);
const __m128i tr0_7 = _mm_unpackhi_epi16(in[6], in[7]);
const __m128i tr1_0 = _mm_unpacklo_epi32(tr0_0, tr0_1);
const __m128i tr1_1 = _mm_unpacklo_epi32(tr0_4, tr0_5);
const __m128i tr1_2 = _mm_unpackhi_epi32(tr0_0, tr0_1);
const __m128i tr1_3 = _mm_unpackhi_epi32(tr0_4, tr0_5);
const __m128i tr1_4 = _mm_unpacklo_epi32(tr0_2, tr0_3);
const __m128i tr1_5 = _mm_unpacklo_epi32(tr0_6, tr0_7);
const __m128i tr1_6 = _mm_unpackhi_epi32(tr0_2, tr0_3);
const __m128i tr1_7 = _mm_unpackhi_epi32(tr0_6, tr0_7);
res[0] = _mm_unpacklo_epi64(tr1_0, tr1_1);
res[1] = _mm_unpackhi_epi64(tr1_0, tr1_1);
res[2] = _mm_unpacklo_epi64(tr1_2, tr1_3);
res[3] = _mm_unpackhi_epi64(tr1_2, tr1_3);
res[4] = _mm_unpacklo_epi64(tr1_4, tr1_5);
res[5] = _mm_unpackhi_epi64(tr1_4, tr1_5);
res[6] = _mm_unpacklo_epi64(tr1_6, tr1_7);
res[7] = _mm_unpackhi_epi64(tr1_6, tr1_7);
}
static INLINE void array_transpose_16x16(__m128i *res0, __m128i *res1) {
__m128i tbuf[8];
array_transpose_8x8(res0, res0);
array_transpose_8x8(res1, tbuf);
array_transpose_8x8(res0 + 8, res1);
array_transpose_8x8(res1 + 8, res1 + 8);
res0[8] = tbuf[0];
res0[9] = tbuf[1];
res0[10] = tbuf[2];
res0[11] = tbuf[3];
res0[12] = tbuf[4];
res0[13] = tbuf[5];
res0[14] = tbuf[6];
res0[15] = tbuf[7];
}
static INLINE void load_buffer_8x16(const int16_t *input, __m128i *in) {
in[0] = _mm_load_si128((const __m128i *)(input + 0 * 16));
in[1] = _mm_load_si128((const __m128i *)(input + 1 * 16));
in[2] = _mm_load_si128((const __m128i *)(input + 2 * 16));
in[3] = _mm_load_si128((const __m128i *)(input + 3 * 16));
in[4] = _mm_load_si128((const __m128i *)(input + 4 * 16));
in[5] = _mm_load_si128((const __m128i *)(input + 5 * 16));
in[6] = _mm_load_si128((const __m128i *)(input + 6 * 16));
in[7] = _mm_load_si128((const __m128i *)(input + 7 * 16));
in[8] = _mm_load_si128((const __m128i *)(input + 8 * 16));
in[9] = _mm_load_si128((const __m128i *)(input + 9 * 16));
in[10] = _mm_load_si128((const __m128i *)(input + 10 * 16));
in[11] = _mm_load_si128((const __m128i *)(input + 11 * 16));
in[12] = _mm_load_si128((const __m128i *)(input + 12 * 16));
in[13] = _mm_load_si128((const __m128i *)(input + 13 * 16));
in[14] = _mm_load_si128((const __m128i *)(input + 14 * 16));
in[15] = _mm_load_si128((const __m128i *)(input + 15 * 16));
}
#define RECON_AND_STORE(dest, in_x) \
{ \
__m128i d0 = _mm_loadl_epi64((__m128i *)(dest)); \
d0 = _mm_unpacklo_epi8(d0, zero); \
d0 = _mm_add_epi16(in_x, d0); \
d0 = _mm_packus_epi16(d0, d0); \
_mm_storel_epi64((__m128i *)(dest), d0); \
dest += stride; \
}
static INLINE void write_buffer_8x16(uint8_t *dest, __m128i *in, int stride) {
const __m128i final_rounding = _mm_set1_epi16(1<<5);
const __m128i zero = _mm_setzero_si128();
// Final rounding and shift
in[0] = _mm_adds_epi16(in[0], final_rounding);
in[1] = _mm_adds_epi16(in[1], final_rounding);
in[2] = _mm_adds_epi16(in[2], final_rounding);
in[3] = _mm_adds_epi16(in[3], final_rounding);
in[4] = _mm_adds_epi16(in[4], final_rounding);
in[5] = _mm_adds_epi16(in[5], final_rounding);
in[6] = _mm_adds_epi16(in[6], final_rounding);
in[7] = _mm_adds_epi16(in[7], final_rounding);
in[8] = _mm_adds_epi16(in[8], final_rounding);
in[9] = _mm_adds_epi16(in[9], final_rounding);
in[10] = _mm_adds_epi16(in[10], final_rounding);
in[11] = _mm_adds_epi16(in[11], final_rounding);
in[12] = _mm_adds_epi16(in[12], final_rounding);
in[13] = _mm_adds_epi16(in[13], final_rounding);
in[14] = _mm_adds_epi16(in[14], final_rounding);
in[15] = _mm_adds_epi16(in[15], final_rounding);
in[0] = _mm_srai_epi16(in[0], 6);
in[1] = _mm_srai_epi16(in[1], 6);
in[2] = _mm_srai_epi16(in[2], 6);
in[3] = _mm_srai_epi16(in[3], 6);
in[4] = _mm_srai_epi16(in[4], 6);
in[5] = _mm_srai_epi16(in[5], 6);
in[6] = _mm_srai_epi16(in[6], 6);
in[7] = _mm_srai_epi16(in[7], 6);
in[8] = _mm_srai_epi16(in[8], 6);
in[9] = _mm_srai_epi16(in[9], 6);
in[10] = _mm_srai_epi16(in[10], 6);
in[11] = _mm_srai_epi16(in[11], 6);
in[12] = _mm_srai_epi16(in[12], 6);
in[13] = _mm_srai_epi16(in[13], 6);
in[14] = _mm_srai_epi16(in[14], 6);
in[15] = _mm_srai_epi16(in[15], 6);
RECON_AND_STORE(dest, in[0]);
RECON_AND_STORE(dest, in[1]);
RECON_AND_STORE(dest, in[2]);
RECON_AND_STORE(dest, in[3]);
RECON_AND_STORE(dest, in[4]);
RECON_AND_STORE(dest, in[5]);
RECON_AND_STORE(dest, in[6]);
RECON_AND_STORE(dest, in[7]);
RECON_AND_STORE(dest, in[8]);
RECON_AND_STORE(dest, in[9]);
RECON_AND_STORE(dest, in[10]);
RECON_AND_STORE(dest, in[11]);
RECON_AND_STORE(dest, in[12]);
RECON_AND_STORE(dest, in[13]);
RECON_AND_STORE(dest, in[14]);
RECON_AND_STORE(dest, in[15]);
}
/*
* Copyright (c) 2014 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 <tmmintrin.h> // SSSE3
#include "vp9/common/x86/vp9_idct_intrin_sse2.h"
static void idct16_8col(__m128i *in) {
const __m128i k__cospi_p30_m02 = pair_set_epi16(cospi_30_64, -cospi_2_64);
const __m128i k__cospi_p02_p30 = pair_set_epi16(cospi_2_64, cospi_30_64);
const __m128i k__cospi_p14_m18 = pair_set_epi16(cospi_14_64, -cospi_18_64);
const __m128i k__cospi_p18_p14 = pair_set_epi16(cospi_18_64, cospi_14_64);
const __m128i k__cospi_p22_m10 = pair_set_epi16(cospi_22_64, -cospi_10_64);
const __m128i k__cospi_p10_p22 = pair_set_epi16(cospi_10_64, cospi_22_64);
const __m128i k__cospi_p06_m26 = pair_set_epi16(cospi_6_64, -cospi_26_64);
const __m128i k__cospi_p26_p06 = pair_set_epi16(cospi_26_64, cospi_6_64);
const __m128i k__cospi_p28_m04 = pair_set_epi16(cospi_28_64, -cospi_4_64);
const __m128i k__cospi_p04_p28 = pair_set_epi16(cospi_4_64, cospi_28_64);
const __m128i k__cospi_p12_m20 = pair_set_epi16(cospi_12_64, -cospi_20_64);
const __m128i k__cospi_p20_p12 = pair_set_epi16(cospi_20_64, cospi_12_64);
const __m128i k__cospi_p24_m08 = pair_set_epi16(cospi_24_64, -cospi_8_64);
const __m128i k__cospi_p08_p24 = pair_set_epi16(cospi_8_64, cospi_24_64);
const __m128i k__cospi_m08_p24 = pair_set_epi16(-cospi_8_64, cospi_24_64);
const __m128i k__cospi_p24_p08 = pair_set_epi16(cospi_24_64, cospi_8_64);
const __m128i k__cospi_m24_m08 = pair_set_epi16(-cospi_24_64, -cospi_8_64);
const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
const __m128i k__cospi_p16_p16_x2 = pair_set_epi16(23170, 23170);
__m128i v[16], u[16], s[16], t[16];
// stage 1
s[0] = in[0];
s[1] = in[8];
s[2] = in[4];
s[3] = in[12];
s[4] = in[2];
s[5] = in[10];
s[6] = in[6];
s[7] = in[14];
s[8] = in[1];
s[9] = in[9];
s[10] = in[5];
s[11] = in[13];
s[12] = in[3];
s[13] = in[11];
s[14] = in[7];
s[15] = in[15];
// stage 2
u[0] = _mm_unpacklo_epi16(s[8], s[15]);
u[1] = _mm_unpackhi_epi16(s[8], s[15]);
u[2] = _mm_unpacklo_epi16(s[9], s[14]);
u[3] = _mm_unpackhi_epi16(s[9], s[14]);
u[4] = _mm_unpacklo_epi16(s[10], s[13]);
u[5] = _mm_unpackhi_epi16(s[10], s[13]);
u[6] = _mm_unpacklo_epi16(s[11], s[12]);
u[7] = _mm_unpackhi_epi16(s[11], s[12]);
v[0] = _mm_madd_epi16(u[0], k__cospi_p30_m02);
v[1] = _mm_madd_epi16(u[1], k__cospi_p30_m02);
v[2] = _mm_madd_epi16(u[0], k__cospi_p02_p30);
v[3] = _mm_madd_epi16(u[1], k__cospi_p02_p30);
v[4] = _mm_madd_epi16(u[2], k__cospi_p14_m18);
v[5] = _mm_madd_epi16(u[3], k__cospi_p14_m18);
v[6] = _mm_madd_epi16(u[2], k__cospi_p18_p14);
v[7] = _mm_madd_epi16(u[3], k__cospi_p18_p14);
v[8] = _mm_madd_epi16(u[4], k__cospi_p22_m10);
v[9] = _mm_madd_epi16(u[5], k__cospi_p22_m10);
v[10] = _mm_madd_epi16(u[4], k__cospi_p10_p22);
v[11] = _mm_madd_epi16(u[5], k__cospi_p10_p22);
v[12] = _mm_madd_epi16(u[6], k__cospi_p06_m26);
v[13] = _mm_madd_epi16(u[7], k__cospi_p06_m26);
v[14] = _mm_madd_epi16(u[6], k__cospi_p26_p06);
v[15] = _mm_madd_epi16(u[7], k__cospi_p26_p06);
u[0] = _mm_add_epi32(v[0], k__DCT_CONST_ROUNDING);
u[1] = _mm_add_epi32(v[1], k__DCT_CONST_ROUNDING);
u[2] = _mm_add_epi32(v[2], k__DCT_CONST_ROUNDING);
u[3] = _mm_add_epi32(v[3], k__DCT_CONST_ROUNDING);
u[4] = _mm_add_epi32(v[4], k__DCT_CONST_ROUNDING);
u[5] = _mm_add_epi32(v[5], k__DCT_CONST_ROUNDING);
u[6] = _mm_add_epi32(v[6], k__DCT_CONST_ROUNDING);
u[7] = _mm_add_epi32(v[7], k__DCT_CONST_ROUNDING);
u[8] = _mm_add_epi32(v[8], k__DCT_CONST_ROUNDING);
u[9] = _mm_add_epi32(v[9], k__DCT_CONST_ROUNDING);
u[10] = _mm_add_epi32(v[10], k__DCT_CONST_ROUNDING);
u[11] = _mm_add_epi32(v[11], k__DCT_CONST_ROUNDING);
u[12] = _mm_add_epi32(v[12], k__DCT_CONST_ROUNDING);
u[13] = _mm_add_epi32(v[13], k__DCT_CONST_ROUNDING);
u[14] = _mm_add_epi32(v[14], k__DCT_CONST_ROUNDING);
u[15] = _mm_add_epi32(v[15], k__DCT_CONST_ROUNDING);
u[0] = _mm_srai_epi32(u[0], DCT_CONST_BITS);
u[1] = _mm_srai_epi32(u[1], DCT_CONST_BITS);
u[2] = _mm_srai_epi32(u[2], DCT_CONST_BITS);
u[3] = _mm_srai_epi32(u[3], DCT_CONST_BITS);
u[4] = _mm_srai_epi32(u[4], DCT_CONST_BITS);
u[5] = _mm_srai_epi32(u[5], DCT_CONST_BITS);
u[6] = _mm_srai_epi32(u[6], DCT_CONST_BITS);
u[7] = _mm_srai_epi32(u[7], DCT_CONST_BITS);
u[8] = _mm_srai_epi32(u[8], DCT_CONST_BITS);
u[9] = _mm_srai_epi32(u[9], DCT_CONST_BITS);
u[10] = _mm_srai_epi32(u[10], DCT_CONST_BITS);
u[11] = _mm_srai_epi32(u[11], DCT_CONST_BITS);
u[12] = _mm_srai_epi32(u[12], DCT_CONST_BITS);
u[13] = _mm_srai_epi32(u[13], DCT_CONST_BITS);
u[14] = _mm_srai_epi32(u[14], DCT_CONST_BITS);
u[15] = _mm_srai_epi32(u[15], DCT_CONST_BITS);
s[8] = _mm_packs_epi32(u[0], u[1]);
s[15] = _mm_packs_epi32(u[2], u[3]);
s[9] = _mm_packs_epi32(u[4], u[5]);
s[14] = _mm_packs_epi32(u[6], u[7]);
s[10] = _mm_packs_epi32(u[8], u[9]);
s[13] = _mm_packs_epi32(u[10], u[11]);
s[11] = _mm_packs_epi32(u[12], u[13]);
s[12] = _mm_packs_epi32(u[14], u[15]);
// stage 3
t[0] = s[0];
t[1] = s[1];
t[2] = s[2];
t[3] = s[3];
u[0] = _mm_unpacklo_epi16(s[4], s[7]);
u[1] = _mm_unpackhi_epi16(s[4], s[7]);
u[2] = _mm_unpacklo_epi16(s[5], s[6]);
u[3] = _mm_unpackhi_epi16(s[5], s[6]);
v[0] = _mm_madd_epi16(u[0], k__cospi_p28_m04);
v[1] = _mm_madd_epi16(u[1], k__cospi_p28_m04);
v[2] = _mm_madd_epi16(u[0], k__cospi_p04_p28);
v[3] = _mm_madd_epi16(u[1], k__cospi_p04_p28);
v[4] = _mm_madd_epi16(u[2], k__cospi_p12_m20);
v[5] = _mm_madd_epi16(u[3], k__cospi_p12_m20);
v[6] = _mm_madd_epi16(u[2], k__cospi_p20_p12);
v[7] = _mm_madd_epi16(u[3], k__cospi_p20_p12);
u[0] = _mm_add_epi32(v[0], k__DCT_CONST_ROUNDING);
u[1] = _mm_add_epi32(v[1], k__DCT_CONST_ROUNDING);
u[2] = _mm_add_epi32(v[2], k__DCT_CONST_ROUNDING);
u[3] = _mm_add_epi32(v[3], k__DCT_CONST_ROUNDING);
u[4] = _mm_add_epi32(v[4], k__DCT_CONST_ROUNDING);
u[5] = _mm_add_epi32(v[5], k__DCT_CONST_ROUNDING);
u[6] = _mm_add_epi32(v[6], k__DCT_CONST_ROUNDING);
u[7] = _mm_add_epi32(v[7], k__DCT_CONST_ROUNDING);
u[0] = _mm_srai_epi32(u[0], DCT_CONST_BITS);
u[1] = _mm_srai_epi32(u[1], DCT_CONST_BITS);
u[2] = _mm_srai_epi32(u[2], DCT_CONST_BITS);
u[3] = _mm_srai_epi32(u[3], DCT_CONST_BITS);
u[4] = _mm_srai_epi32(u[4], DCT_CONST_BITS);
u[5] = _mm_srai_epi32(u[5], DCT_CONST_BITS);
u[6] = _mm_srai_epi32(u[6], DCT_CONST_BITS);
u[7] = _mm_srai_epi32(u[7], DCT_CONST_BITS);
t[4] = _mm_packs_epi32(u[0], u[1]);
t[7] = _mm_packs_epi32(u[2], u[3]);
t[5] = _mm_packs_epi32(u[4], u[5]);
t[6] = _mm_packs_epi32(u[6], u[7]);
t[8] = _mm_add_epi16(s[8], s[9]);
t[9] = _mm_sub_epi16(s[8], s[9]);
t[10] = _mm_sub_epi16(s[11], s[10]);
t[11] = _mm_add_epi16(s[10], s[11]);
t[12] = _mm_add_epi16(s[12], s[13]);
t[13] = _mm_sub_epi16(s[12], s[13]);
t[14] = _mm_sub_epi16(s[15], s[14]);
t[15] = _mm_add_epi16(s[14], s[15]);
// stage 4
u[0] = _mm_add_epi16(t[0], t[1]);
u[1] = _mm_sub_epi16(t[0], t[1]);
u[2] = _mm_unpacklo_epi16(t[2], t[3]);
u[3] = _mm_unpackhi_epi16(t[2], t[3]);
u[4] = _mm_unpacklo_epi16(t[9], t[14]);
u[5] = _mm_unpackhi_epi16(t[9], t[14]);
u[6] = _mm_unpacklo_epi16(t[10], t[13]);
u[7] = _mm_unpackhi_epi16(t[10], t[13]);
s[0] = _mm_mulhrs_epi16(u[0], k__cospi_p16_p16_x2);
s[1] = _mm_mulhrs_epi16(u[1], k__cospi_p16_p16_x2);
v[4] = _mm_madd_epi16(u[2], k__cospi_p24_m08);
v[5] = _mm_madd_epi16(u[3], k__cospi_p24_m08);
v[6] = _mm_madd_epi16(u[2], k__cospi_p08_p24);
v[7] = _mm_madd_epi16(u[3], k__cospi_p08_p24);
v[8] = _mm_madd_epi16(u[4], k__cospi_m08_p24);
v[9] = _mm_madd_epi16(u[5], k__cospi_m08_p24);
v[10] = _mm_madd_epi16(u[4], k__cospi_p24_p08);
v[11] = _mm_madd_epi16(u[5], k__cospi_p24_p08);
v[12] = _mm_madd_epi16(u[6], k__cospi_m24_m08);
v[13] = _mm_madd_epi16(u[7], k__cospi_m24_m08);
v[14] = _mm_madd_epi16(u[6], k__cospi_m08_p24);
v[15] = _mm_madd_epi16(u[7], k__cospi_m08_p24);
u[4] = _mm_add_epi32(v[4], k__DCT_CONST_ROUNDING);
u[5] = _mm_add_epi32(v[5], k__DCT_CONST_ROUNDING);
u[6] = _mm_add_epi32(v[6], k__DCT_CONST_ROUNDING);
u[7] = _mm_add_epi32(v[7], k__DCT_CONST_ROUNDING);
u[8] = _mm_add_epi32(v[8], k__DCT_CONST_ROUNDING);
u[9] = _mm_add_epi32(v[9], k__DCT_CONST_ROUNDING);
u[10] = _mm_add_epi32(v[10], k__DCT_CONST_ROUNDING);
u[11] = _mm_add_epi32(v[11], k__DCT_CONST_ROUNDING);
u[12] = _mm_add_epi32(v[12], k__DCT_CONST_ROUNDING);
u[13] = _mm_add_epi32(v[13], k__DCT_CONST_ROUNDING);
u[14] = _mm_add_epi32(v[14], k__DCT_CONST_ROUNDING);
u[15] = _mm_add_epi32(v[15], k__DCT_CONST_ROUNDING);
u[4] = _mm_srai_epi32(u[4], DCT_CONST_BITS);
u[5] = _mm_srai_epi32(u[5], DCT_CONST_BITS);
u[6] = _mm_srai_epi32(u[6], DCT_CONST_BITS);
u[7] = _mm_srai_epi32(u[7], DCT_CONST_BITS);
u[8] = _mm_srai_epi32(u[8], DCT_CONST_BITS);
u[9] = _mm_srai_epi32(u[9], DCT_CONST_BITS);
u[10] = _mm_srai_epi32(u[10], DCT_CONST_BITS);
u[11] = _mm_srai_epi32(u[11], DCT_CONST_BITS);
u[12] = _mm_srai_epi32(u[12], DCT_CONST_BITS);
u[13] = _mm_srai_epi32(u[13], DCT_CONST_BITS);
u[14] = _mm_srai_epi32(u[14], DCT_CONST_BITS);
u[15] = _mm_srai_epi32(u[15], DCT_CONST_BITS);
s[2] = _mm_packs_epi32(u[4], u[5]);
s[3] = _mm_packs_epi32(u[6], u[7]);
s[4] = _mm_add_epi16(t[4], t[5]);