ref: a0944ba19fb4969fc6b3a55c7189a482a9cd3e4f
dir: /vpx_dsp/arm/highbd_idct32x32_add_neon.c/
/*
* 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 <arm_neon.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/arm/idct_neon.h"
#include "vpx_dsp/inv_txfm.h"
static INLINE void highbd_idct32x32_1_add_pos_kernel(uint16_t **dest,
const int stride,
const int16x8_t res,
const int16x8_t max) {
const uint16x8_t a0 = vld1q_u16(*dest);
const uint16x8_t a1 = vld1q_u16(*dest + 8);
const uint16x8_t a2 = vld1q_u16(*dest + 16);
const uint16x8_t a3 = vld1q_u16(*dest + 24);
const int16x8_t b0 = vaddq_s16(res, vreinterpretq_s16_u16(a0));
const int16x8_t b1 = vaddq_s16(res, vreinterpretq_s16_u16(a1));
const int16x8_t b2 = vaddq_s16(res, vreinterpretq_s16_u16(a2));
const int16x8_t b3 = vaddq_s16(res, vreinterpretq_s16_u16(a3));
const int16x8_t c0 = vminq_s16(b0, max);
const int16x8_t c1 = vminq_s16(b1, max);
const int16x8_t c2 = vminq_s16(b2, max);
const int16x8_t c3 = vminq_s16(b3, max);
vst1q_u16(*dest, vreinterpretq_u16_s16(c0));
vst1q_u16(*dest + 8, vreinterpretq_u16_s16(c1));
vst1q_u16(*dest + 16, vreinterpretq_u16_s16(c2));
vst1q_u16(*dest + 24, vreinterpretq_u16_s16(c3));
*dest += stride;
}
static INLINE void highbd_idct32x32_1_add_neg_kernel(uint16_t **dest,
const int stride,
const int16x8_t res) {
const uint16x8_t a0 = vld1q_u16(*dest);
const uint16x8_t a1 = vld1q_u16(*dest + 8);
const uint16x8_t a2 = vld1q_u16(*dest + 16);
const uint16x8_t a3 = vld1q_u16(*dest + 24);
const int16x8_t b0 = vaddq_s16(res, vreinterpretq_s16_u16(a0));
const int16x8_t b1 = vaddq_s16(res, vreinterpretq_s16_u16(a1));
const int16x8_t b2 = vaddq_s16(res, vreinterpretq_s16_u16(a2));
const int16x8_t b3 = vaddq_s16(res, vreinterpretq_s16_u16(a3));
const uint16x8_t c0 = vqshluq_n_s16(b0, 0);
const uint16x8_t c1 = vqshluq_n_s16(b1, 0);
const uint16x8_t c2 = vqshluq_n_s16(b2, 0);
const uint16x8_t c3 = vqshluq_n_s16(b3, 0);
vst1q_u16(*dest, c0);
vst1q_u16(*dest + 8, c1);
vst1q_u16(*dest + 16, c2);
vst1q_u16(*dest + 24, c3);
*dest += stride;
}
void vpx_highbd_idct32x32_1_add_neon(const tran_low_t *input, uint16_t *dest,
int stride, int bd) {
const tran_low_t out0 = HIGHBD_WRAPLOW(
dct_const_round_shift(input[0] * (tran_high_t)cospi_16_64), bd);
const tran_low_t out1 = HIGHBD_WRAPLOW(
dct_const_round_shift(out0 * (tran_high_t)cospi_16_64), bd);
const int16_t a1 = ROUND_POWER_OF_TWO(out1, 6);
const int16x8_t dc = vdupq_n_s16(a1);
int i;
if (a1 >= 0) {
const int16x8_t max = vdupq_n_s16((1 << bd) - 1);
for (i = 0; i < 8; ++i) {
highbd_idct32x32_1_add_pos_kernel(&dest, stride, dc, max);
highbd_idct32x32_1_add_pos_kernel(&dest, stride, dc, max);
highbd_idct32x32_1_add_pos_kernel(&dest, stride, dc, max);
highbd_idct32x32_1_add_pos_kernel(&dest, stride, dc, max);
}
} else {
for (i = 0; i < 8; ++i) {
highbd_idct32x32_1_add_neg_kernel(&dest, stride, dc);
highbd_idct32x32_1_add_neg_kernel(&dest, stride, dc);
highbd_idct32x32_1_add_neg_kernel(&dest, stride, dc);
highbd_idct32x32_1_add_neg_kernel(&dest, stride, dc);
}
}
}