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/*
* 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 <arm_neon.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/inv_txfm.h"
static INLINE uint8x8_t create_dcd(const int16_t dc) {
int16x8_t t = vdupq_n_s16(dc);
return vqmovun_s16(t);
}
static INLINE void idct8x8_1_add_pos_kernel(uint8_t **dest, const int stride,
const uint8x8_t res) {
const uint8x8_t a = vld1_u8(*dest);
const uint8x8_t b = vqadd_u8(a, res);
vst1_u8(*dest, b);
*dest += stride;
}
static INLINE void idct8x8_1_add_neg_kernel(uint8_t **dest, const int stride,
const uint8x8_t res) {
const uint8x8_t a = vld1_u8(*dest);
const uint8x8_t b = vqsub_u8(a, res);
vst1_u8(*dest, b);
*dest += stride;
}
void vpx_idct8x8_1_add_neon(const tran_low_t *input, uint8_t *dest,
int stride) {
const int16_t out0 =
WRAPLOW(dct_const_round_shift((int16_t)input[0] * cospi_16_64));
const int16_t out1 = WRAPLOW(dct_const_round_shift(out0 * cospi_16_64));
const int16_t a1 = ROUND_POWER_OF_TWO(out1, 5);
if (a1 >= 0) {
const uint8x8_t dc = create_dcd(a1);
idct8x8_1_add_pos_kernel(&dest, stride, dc);
idct8x8_1_add_pos_kernel(&dest, stride, dc);
idct8x8_1_add_pos_kernel(&dest, stride, dc);
idct8x8_1_add_pos_kernel(&dest, stride, dc);
idct8x8_1_add_pos_kernel(&dest, stride, dc);
idct8x8_1_add_pos_kernel(&dest, stride, dc);
idct8x8_1_add_pos_kernel(&dest, stride, dc);
idct8x8_1_add_pos_kernel(&dest, stride, dc);
} else {
const uint8x8_t dc = create_dcd(-a1);
idct8x8_1_add_neg_kernel(&dest, stride, dc);
idct8x8_1_add_neg_kernel(&dest, stride, dc);
idct8x8_1_add_neg_kernel(&dest, stride, dc);
idct8x8_1_add_neg_kernel(&dest, stride, dc);
idct8x8_1_add_neg_kernel(&dest, stride, dc);
idct8x8_1_add_neg_kernel(&dest, stride, dc);
idct8x8_1_add_neg_kernel(&dest, stride, dc);
idct8x8_1_add_neg_kernel(&dest, stride, dc);
}
}
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