ref: cb16652598961ec949000b42bb2de7af3e4763c1
dir: /vp9/common/arm/neon/vp9_iht8x8_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 <assert.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/arm/transpose_neon.h"
static INLINE void iadst_half_butterfly_neon(int16x8_t *const x) {
const int16x4_t c = vdup_n_s16(cospi_16_64);
const int16x8_t sum = vaddq_s16(x[0], x[1]);
const int16x8_t sub = vsubq_s16(x[0], x[1]);
int32x4_t t0[2], t1[2];
t0[0] = vmull_s16(c, vget_low_s16(sum));
t0[1] = vmull_s16(c, vget_high_s16(sum));
t1[0] = vmull_s16(c, vget_low_s16(sub));
t1[1] = vmull_s16(c, vget_high_s16(sub));
x[0] = dct_const_round_shift_low_8(t0);
x[1] = dct_const_round_shift_low_8(t1);
}
static INLINE void iadst_butterfly_neon(const int16x8_t in0,
const int16x8_t in1, const int c0,
const int c1, int32x4_t *const s0,
int32x4_t *const s1) {
const int16x4_t cst0 = vdup_n_s16(c0);
const int16x4_t cst1 = vdup_n_s16(c1);
int32x4_t t0[2], t1[2];
t0[0] = vmull_s16(cst0, vget_low_s16(in0));
t0[1] = vmull_s16(cst0, vget_high_s16(in0));
t1[0] = vmull_s16(cst1, vget_low_s16(in0));
t1[1] = vmull_s16(cst1, vget_high_s16(in0));
s0[0] = vmlal_s16(t0[0], cst1, vget_low_s16(in1));
s0[1] = vmlal_s16(t0[1], cst1, vget_high_s16(in1));
s1[0] = vmlsl_s16(t1[0], cst0, vget_low_s16(in1));
s1[1] = vmlsl_s16(t1[1], cst0, vget_high_s16(in1));
}
static INLINE int16x8_t add_dct_const_round_shift_low_8(
const int32x4_t *const in0, const int32x4_t *const in1) {
int32x4_t sum[2];
sum[0] = vaddq_s32(in0[0], in1[0]);
sum[1] = vaddq_s32(in0[1], in1[1]);
return dct_const_round_shift_low_8(sum);
}
static INLINE int16x8_t sub_dct_const_round_shift_low_8(
const int32x4_t *const in0, const int32x4_t *const in1) {
int32x4_t sum[2];
sum[0] = vsubq_s32(in0[0], in1[0]);
sum[1] = vsubq_s32(in0[1], in1[1]);
return dct_const_round_shift_low_8(sum);
}
static INLINE void iadst8(int16x8_t *const io) {
int16x8_t x[8], t[4];
int32x4_t s0[2], s1[2], s2[2], s3[2], s4[2], s5[2], s6[2], s7[2];
x[0] = io[7];
x[1] = io[0];
x[2] = io[5];
x[3] = io[2];
x[4] = io[3];
x[5] = io[4];
x[6] = io[1];
x[7] = io[6];
// stage 1
iadst_butterfly_neon(x[0], x[1], cospi_2_64, cospi_30_64, s0, s1);
iadst_butterfly_neon(x[2], x[3], cospi_10_64, cospi_22_64, s2, s3);
iadst_butterfly_neon(x[4], x[5], cospi_18_64, cospi_14_64, s4, s5);
iadst_butterfly_neon(x[6], x[7], cospi_26_64, cospi_6_64, s6, s7);
x[0] = add_dct_const_round_shift_low_8(s0, s4);
x[1] = add_dct_const_round_shift_low_8(s1, s5);
x[2] = add_dct_const_round_shift_low_8(s2, s6);
x[3] = add_dct_const_round_shift_low_8(s3, s7);
x[4] = sub_dct_const_round_shift_low_8(s0, s4);
x[5] = sub_dct_const_round_shift_low_8(s1, s5);
x[6] = sub_dct_const_round_shift_low_8(s2, s6);
x[7] = sub_dct_const_round_shift_low_8(s3, s7);
// stage 2
t[0] = x[0];
t[1] = x[1];
t[2] = x[2];
t[3] = x[3];
iadst_butterfly_neon(x[4], x[5], cospi_8_64, cospi_24_64, s4, s5);
iadst_butterfly_neon(x[7], x[6], cospi_24_64, cospi_8_64, s7, s6);
x[0] = vaddq_s16(t[0], t[2]);
x[1] = vaddq_s16(t[1], t[3]);
x[2] = vsubq_s16(t[0], t[2]);
x[3] = vsubq_s16(t[1], t[3]);
x[4] = add_dct_const_round_shift_low_8(s4, s6);
x[5] = add_dct_const_round_shift_low_8(s5, s7);
x[6] = sub_dct_const_round_shift_low_8(s4, s6);
x[7] = sub_dct_const_round_shift_low_8(s5, s7);
// stage 3
iadst_half_butterfly_neon(x + 2);
iadst_half_butterfly_neon(x + 6);
io[0] = x[0];
io[1] = vnegq_s16(x[4]);
io[2] = x[6];
io[3] = vnegq_s16(x[2]);
io[4] = x[3];
io[5] = vnegq_s16(x[7]);
io[6] = x[5];
io[7] = vnegq_s16(x[1]);
}
void vp9_iht8x8_64_add_neon(const tran_low_t *input, uint8_t *dest, int stride,
int tx_type) {
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 a[8];
a[0] = load_tran_low_to_s16q(input + 0 * 8);
a[1] = load_tran_low_to_s16q(input + 1 * 8);
a[2] = load_tran_low_to_s16q(input + 2 * 8);
a[3] = load_tran_low_to_s16q(input + 3 * 8);
a[4] = load_tran_low_to_s16q(input + 4 * 8);
a[5] = load_tran_low_to_s16q(input + 5 * 8);
a[6] = load_tran_low_to_s16q(input + 6 * 8);
a[7] = load_tran_low_to_s16q(input + 7 * 8);
transpose_s16_8x8(&a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6], &a[7]);
switch (tx_type) {
case 0: // DCT_DCT
idct8x8_64_1d_bd8_kernel(cospis0, cospis1, a);
transpose_s16_8x8(&a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6], &a[7]);
idct8x8_64_1d_bd8_kernel(cospis0, cospis1, a);
break;
case 1: // ADST_DCT
idct8x8_64_1d_bd8_kernel(cospis0, cospis1, a);
transpose_s16_8x8(&a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6], &a[7]);
iadst8(a);
break;
case 2: // DCT_ADST
iadst8(a);
transpose_s16_8x8(&a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6], &a[7]);
idct8x8_64_1d_bd8_kernel(cospis0, cospis1, a);
break;
case 3: // ADST_ADST
iadst8(a);
transpose_s16_8x8(&a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6], &a[7]);
iadst8(a);
break;
default: assert(0); break;
}
idct8x8_add8x8_neon(a, dest, stride);
}