ref: 15dad6bcbceaf4b40e878daede0b2d57c6ffbaf8
dir: /vpx_dsp/x86/inv_txfm_ssse3.h/
/*
* 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.
*/
#ifndef VPX_DSP_X86_INV_TXFM_SSSE3_H_
#define VPX_DSP_X86_INV_TXFM_SSSE3_H_
#include <tmmintrin.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/x86/inv_txfm_sse2.h"
#include "vpx_dsp/x86/transpose_sse2.h"
#include "vpx_dsp/x86/txfm_common_sse2.h"
static INLINE void idct8x8_12_add_kernel_ssse3(__m128i *const io /* io[8] */) {
const __m128i cp_28d_4d = dual_set_epi16(2 * cospi_28_64, 2 * cospi_4_64);
const __m128i cp_n20d_12d = dual_set_epi16(-2 * cospi_20_64, 2 * cospi_12_64);
const __m128i cp_8d_24d = dual_set_epi16(2 * cospi_8_64, 2 * cospi_24_64);
const __m128i cp_16_16 = _mm_set1_epi16(cospi_16_64);
const __m128i cp_16_n16 = pair_set_epi16(cospi_16_64, -cospi_16_64);
const __m128i cospi_16_64d = _mm_set1_epi16((int16_t)(2 * cospi_16_64));
const __m128i cospi_28_64d = _mm_set1_epi16((int16_t)(2 * cospi_28_64));
const __m128i cospi_4_64d = _mm_set1_epi16((int16_t)(2 * cospi_4_64));
const __m128i cospi_n20_64d = _mm_set1_epi16((int16_t)(-2 * cospi_20_64));
const __m128i cospi_12_64d = _mm_set1_epi16((int16_t)(2 * cospi_12_64));
const __m128i cospi_24_64d = _mm_set1_epi16((int16_t)(2 * cospi_24_64));
const __m128i cospi_8_64d = _mm_set1_epi16((int16_t)(2 * cospi_8_64));
__m128i step1[8], step2[8], tmp[4];
// pass 1
transpose_16bit_4x4(io, io);
// io[0]: 00 10 20 30 01 11 21 31
// io[1]: 02 12 22 32 03 13 23 33
// stage 1
tmp[0] = _mm_unpacklo_epi64(io[0], io[0]);
tmp[1] = _mm_unpackhi_epi64(io[0], io[0]);
tmp[2] = _mm_unpacklo_epi64(io[1], io[1]);
tmp[3] = _mm_unpackhi_epi64(io[1], io[1]);
step1[4] = _mm_mulhrs_epi16(tmp[1], cp_28d_4d); // step1 4&7
step1[5] = _mm_mulhrs_epi16(tmp[3], cp_n20d_12d); // step1 5&6
// stage 2
step2[0] = _mm_mulhrs_epi16(tmp[0], cospi_16_64d); // step2 0&1
step2[2] = _mm_mulhrs_epi16(tmp[2], cp_8d_24d); // step2 3&2
step2[4] = _mm_add_epi16(step1[4], step1[5]); // step2 4&7
step2[5] = _mm_sub_epi16(step1[4], step1[5]); // step2 5&6
step2[6] = _mm_unpackhi_epi64(step2[5], step2[5]); // step2 6
// stage 3
tmp[0] = _mm_unpacklo_epi16(step2[6], step2[5]);
step1[5] = idct_calc_wraplow_sse2(cp_16_n16, cp_16_16, tmp[0]); // step1 5&6
tmp[0] = _mm_add_epi16(step2[0], step2[2]); // step1 0&1
tmp[1] = _mm_sub_epi16(step2[0], step2[2]); // step1 3&2
step1[2] = _mm_unpackhi_epi64(tmp[1], tmp[0]); // step1 2&1
step1[3] = _mm_unpacklo_epi64(tmp[1], tmp[0]); // step1 3&0
// stage 4
tmp[0] = _mm_add_epi16(step1[3], step2[4]); // output 3&0
tmp[1] = _mm_add_epi16(step1[2], step1[5]); // output 2&1
tmp[2] = _mm_sub_epi16(step1[3], step2[4]); // output 4&7
tmp[3] = _mm_sub_epi16(step1[2], step1[5]); // output 5&6
// pass 2
idct8x8_12_transpose_16bit_4x8(tmp, io);
// stage 1
step1[4] = _mm_mulhrs_epi16(io[1], cospi_28_64d);
step1[7] = _mm_mulhrs_epi16(io[1], cospi_4_64d);
step1[5] = _mm_mulhrs_epi16(io[3], cospi_n20_64d);
step1[6] = _mm_mulhrs_epi16(io[3], cospi_12_64d);
// stage 2
step2[0] = _mm_mulhrs_epi16(io[0], cospi_16_64d); // step2[1] = step2[0]
step2[2] = _mm_mulhrs_epi16(io[2], cospi_24_64d);
step2[3] = _mm_mulhrs_epi16(io[2], cospi_8_64d);
step2[4] = _mm_add_epi16(step1[4], step1[5]);
step2[5] = _mm_sub_epi16(step1[4], step1[5]);
step2[6] = _mm_sub_epi16(step1[7], step1[6]);
step2[7] = _mm_add_epi16(step1[7], step1[6]);
// stage 3
step1[0] = _mm_add_epi16(step2[0], step2[3]);
step1[1] = _mm_add_epi16(step2[0], step2[2]);
step1[2] = _mm_sub_epi16(step2[0], step2[2]);
step1[3] = _mm_sub_epi16(step2[0], step2[3]);
butterfly(step2[6], step2[5], cospi_16_64, cospi_16_64, &step1[5], &step1[6]);
// stage 4
io[0] = _mm_add_epi16(step1[0], step2[7]);
io[1] = _mm_add_epi16(step1[1], step1[6]);
io[2] = _mm_add_epi16(step1[2], step1[5]);
io[3] = _mm_add_epi16(step1[3], step2[4]);
io[4] = _mm_sub_epi16(step1[3], step2[4]);
io[5] = _mm_sub_epi16(step1[2], step1[5]);
io[6] = _mm_sub_epi16(step1[1], step1[6]);
io[7] = _mm_sub_epi16(step1[0], step2[7]);
}
void idct32_135_8x32_ssse3(const __m128i *const in, __m128i *const out);
#endif // VPX_DSP_X86_INV_TXFM_SSSE3_H_