ref: c58f01724cd5f0887e9d0c23396f9f03f78e18d3
dir: /vpx_dsp/arm/idct8x8_add_neon.c/
/*
* 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_config.h"
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/arm/idct_neon.h"
#include "vpx_dsp/arm/mem_neon.h"
#include "vpx_dsp/arm/transpose_neon.h"
#include "vpx_dsp/txfm_common.h"
static INLINE void add8x8(int16x8_t a0, int16x8_t a1, int16x8_t a2,
int16x8_t a3, int16x8_t a4, int16x8_t a5,
int16x8_t a6, int16x8_t a7, uint8_t *dest,
const int stride) {
const uint8_t *dst = dest;
uint8x8_t d0, d1, d2, d3, d4, d5, d6, d7;
uint16x8_t d0_u16, d1_u16, d2_u16, d3_u16, d4_u16, d5_u16, d6_u16, d7_u16;
a0 = vrshrq_n_s16(a0, 5);
a1 = vrshrq_n_s16(a1, 5);
a2 = vrshrq_n_s16(a2, 5);
a3 = vrshrq_n_s16(a3, 5);
a4 = vrshrq_n_s16(a4, 5);
a5 = vrshrq_n_s16(a5, 5);
a6 = vrshrq_n_s16(a6, 5);
a7 = vrshrq_n_s16(a7, 5);
d0 = vld1_u8(dst);
dst += stride;
d1 = vld1_u8(dst);
dst += stride;
d2 = vld1_u8(dst);
dst += stride;
d3 = vld1_u8(dst);
dst += stride;
d4 = vld1_u8(dst);
dst += stride;
d5 = vld1_u8(dst);
dst += stride;
d6 = vld1_u8(dst);
dst += stride;
d7 = vld1_u8(dst);
d0_u16 = vaddw_u8(vreinterpretq_u16_s16(a0), d0);
d1_u16 = vaddw_u8(vreinterpretq_u16_s16(a1), d1);
d2_u16 = vaddw_u8(vreinterpretq_u16_s16(a2), d2);
d3_u16 = vaddw_u8(vreinterpretq_u16_s16(a3), d3);
d4_u16 = vaddw_u8(vreinterpretq_u16_s16(a4), d4);
d5_u16 = vaddw_u8(vreinterpretq_u16_s16(a5), d5);
d6_u16 = vaddw_u8(vreinterpretq_u16_s16(a6), d6);
d7_u16 = vaddw_u8(vreinterpretq_u16_s16(a7), d7);
d0 = vqmovun_s16(vreinterpretq_s16_u16(d0_u16));
d1 = vqmovun_s16(vreinterpretq_s16_u16(d1_u16));
d2 = vqmovun_s16(vreinterpretq_s16_u16(d2_u16));
d3 = vqmovun_s16(vreinterpretq_s16_u16(d3_u16));
d4 = vqmovun_s16(vreinterpretq_s16_u16(d4_u16));
d5 = vqmovun_s16(vreinterpretq_s16_u16(d5_u16));
d6 = vqmovun_s16(vreinterpretq_s16_u16(d6_u16));
d7 = vqmovun_s16(vreinterpretq_s16_u16(d7_u16));
vst1_u8(dest, d0);
dest += stride;
vst1_u8(dest, d1);
dest += stride;
vst1_u8(dest, d2);
dest += stride;
vst1_u8(dest, d3);
dest += stride;
vst1_u8(dest, d4);
dest += stride;
vst1_u8(dest, d5);
dest += stride;
vst1_u8(dest, d6);
dest += stride;
vst1_u8(dest, d7);
}
void vpx_idct8x8_64_add_neon(const tran_low_t *input, uint8_t *dest,
int stride) {
const int16x8_t cospis = vld1q_s16(kCospi);
const int16x4_t cospis0 = vget_low_s16(cospis); // cospi 0, 8, 16, 24
const int16x4_t cospis1 = vget_high_s16(cospis); // cospi 4, 12, 20, 28
int16x8_t a0 = load_tran_low_to_s16q(input);
int16x8_t a1 = load_tran_low_to_s16q(input + 8);
int16x8_t a2 = load_tran_low_to_s16q(input + 16);
int16x8_t a3 = load_tran_low_to_s16q(input + 24);
int16x8_t a4 = load_tran_low_to_s16q(input + 32);
int16x8_t a5 = load_tran_low_to_s16q(input + 40);
int16x8_t a6 = load_tran_low_to_s16q(input + 48);
int16x8_t a7 = load_tran_low_to_s16q(input + 56);
idct8x8_64_1d_bd8(cospis0, cospis1, &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7);
idct8x8_64_1d_bd8(cospis0, cospis1, &a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7);
add8x8(a0, a1, a2, a3, a4, a5, a6, a7, dest, stride);
}
void vpx_idct8x8_12_add_neon(const tran_low_t *input, uint8_t *dest,
int stride) {
const int16x8_t cospis = vld1q_s16(kCospi);
const int16x8_t cospisd = vaddq_s16(cospis, cospis);
const int16x4_t cospis0 = vget_low_s16(cospis); // cospi 0, 8, 16, 24
const int16x4_t cospisd0 = vget_low_s16(cospisd); // doubled 0, 8, 16, 24
const int16x4_t cospisd1 = vget_high_s16(cospisd); // doubled 4, 12, 20, 28
int16x4_t a0, a1, a2, a3, a4, a5, a6, a7;
int16x8_t b0, b1, b2, b3, b4, b5, b6, b7;
a0 = load_tran_low_to_s16d(input);
a1 = load_tran_low_to_s16d(input + 8);
a2 = load_tran_low_to_s16d(input + 16);
a3 = load_tran_low_to_s16d(input + 24);
idct8x8_12_pass1_bd8(cospis0, cospisd0, cospisd1, &a0, &a1, &a2, &a3, &a4,
&a5, &a6, &a7);
idct8x8_12_pass2_bd8(cospis0, cospisd0, cospisd1, a0, a1, a2, a3, a4, a5, a6,
a7, &b0, &b1, &b2, &b3, &b4, &b5, &b6, &b7);
add8x8(b0, b1, b2, b3, b4, b5, b6, b7, dest, stride);
}