ref: 1a7b256f06c13aeedeb08796ab9dcebd5ba9a740
dir: /vp9/common/arm/neon/vp9_iht_neon.h/
/*
* Copyright (c) 2018 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 VP9_COMMON_ARM_NEON_VP9_IHT_NEON_H_
#define VP9_COMMON_ARM_NEON_VP9_IHT_NEON_H_
#include <arm_neon.h>
#include "./vp9_rtcd.h"
#include "./vpx_config.h"
#include "vp9/common/vp9_common.h"
#include "vpx_dsp/arm/idct_neon.h"
#include "vpx_dsp/arm/mem_neon.h"
#include "vpx_dsp/txfm_common.h"
static INLINE void iadst4(int16x8_t *const io) {
const int32x4_t c3 = vdupq_n_s32(sinpi_3_9);
int16x4_t x[4];
int32x4_t s[8], output[4];
const int16x4_t c =
create_s16x4_neon(sinpi_1_9, sinpi_2_9, sinpi_3_9, sinpi_4_9);
x[0] = vget_low_s16(io[0]);
x[1] = vget_low_s16(io[1]);
x[2] = vget_high_s16(io[0]);
x[3] = vget_high_s16(io[1]);
s[0] = vmull_lane_s16(x[0], c, 0);
s[1] = vmull_lane_s16(x[0], c, 1);
s[2] = vmull_lane_s16(x[1], c, 2);
s[3] = vmull_lane_s16(x[2], c, 3);
s[4] = vmull_lane_s16(x[2], c, 0);
s[5] = vmull_lane_s16(x[3], c, 1);
s[6] = vmull_lane_s16(x[3], c, 3);
s[7] = vaddl_s16(x[0], x[3]);
s[7] = vsubw_s16(s[7], x[2]);
s[0] = vaddq_s32(s[0], s[3]);
s[0] = vaddq_s32(s[0], s[5]);
s[1] = vsubq_s32(s[1], s[4]);
s[1] = vsubq_s32(s[1], s[6]);
s[3] = s[2];
s[2] = vmulq_s32(c3, s[7]);
output[0] = vaddq_s32(s[0], s[3]);
output[1] = vaddq_s32(s[1], s[3]);
output[2] = s[2];
output[3] = vaddq_s32(s[0], s[1]);
output[3] = vsubq_s32(output[3], s[3]);
dct_const_round_shift_low_8_dual(output, &io[0], &io[1]);
}
#endif // VP9_COMMON_ARM_NEON_VP9_IHT_NEON_H_