ref: 6a86492adf622b32643c7ee350afb58d2379b156
dir: /vpx_dsp/arm/idct32x32_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/transpose_neon.h"
#include "vpx_dsp/txfm_common.h"
static INLINE void load_from_transformed(const int16_t *const trans_buf,
const int first, const int second,
int16x8_t *const q0,
int16x8_t *const q1) {
*q0 = vld1q_s16(trans_buf + first * 8);
*q1 = vld1q_s16(trans_buf + second * 8);
}
static INLINE void load_from_output(const int16_t *const out, const int first,
const int second, int16x8_t *const q0,
int16x8_t *const q1) {
*q0 = vld1q_s16(out + first * 32);
*q1 = vld1q_s16(out + second * 32);
}
static INLINE void store_in_output(int16_t *const out, const int first,
const int second, const int16x8_t q0,
const int16x8_t q1) {
vst1q_s16(out + first * 32, q0);
vst1q_s16(out + second * 32, q1);
}
static INLINE void store_combine_center_results(uint8_t *p1, uint8_t *p2,
const int stride, int16x8_t q0,
int16x8_t q1, int16x8_t q2,
int16x8_t q3) {
int16x4_t d[4];
d[0] = vld1_s16((int16_t *)p1);
p1 += stride;
d[1] = vld1_s16((int16_t *)p1);
d[3] = vld1_s16((int16_t *)p2);
p2 -= stride;
d[2] = vld1_s16((int16_t *)p2);
q0 = vrshrq_n_s16(q0, 6);
q1 = vrshrq_n_s16(q1, 6);
q2 = vrshrq_n_s16(q2, 6);
q3 = vrshrq_n_s16(q3, 6);
q0 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q0), vreinterpret_u8_s16(d[0])));
q1 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q1), vreinterpret_u8_s16(d[1])));
q2 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q2), vreinterpret_u8_s16(d[2])));
q3 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q3), vreinterpret_u8_s16(d[3])));
d[0] = vreinterpret_s16_u8(vqmovun_s16(q0));
d[1] = vreinterpret_s16_u8(vqmovun_s16(q1));
d[2] = vreinterpret_s16_u8(vqmovun_s16(q2));
d[3] = vreinterpret_s16_u8(vqmovun_s16(q3));
vst1_s16((int16_t *)p1, d[1]);
p1 -= stride;
vst1_s16((int16_t *)p1, d[0]);
vst1_s16((int16_t *)p2, d[2]);
p2 += stride;
vst1_s16((int16_t *)p2, d[3]);
}
static INLINE void store_combine_extreme_results(uint8_t *p1, uint8_t *p2,
const int stride, int16x8_t q0,
int16x8_t q1, int16x8_t q2,
int16x8_t q3) {
int16x4_t d[4];
d[0] = vld1_s16((int16_t *)p1);
p1 += stride;
d[1] = vld1_s16((int16_t *)p1);
d[3] = vld1_s16((int16_t *)p2);
p2 -= stride;
d[2] = vld1_s16((int16_t *)p2);
q0 = vrshrq_n_s16(q0, 6);
q1 = vrshrq_n_s16(q1, 6);
q2 = vrshrq_n_s16(q2, 6);
q3 = vrshrq_n_s16(q3, 6);
q0 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q0), vreinterpret_u8_s16(d[0])));
q1 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q1), vreinterpret_u8_s16(d[1])));
q2 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q2), vreinterpret_u8_s16(d[2])));
q3 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q3), vreinterpret_u8_s16(d[3])));
d[0] = vreinterpret_s16_u8(vqmovun_s16(q0));
d[1] = vreinterpret_s16_u8(vqmovun_s16(q1));
d[2] = vreinterpret_s16_u8(vqmovun_s16(q2));
d[3] = vreinterpret_s16_u8(vqmovun_s16(q3));
vst1_s16((int16_t *)p1, d[1]);
p1 -= stride;
vst1_s16((int16_t *)p1, d[0]);
vst1_s16((int16_t *)p2, d[2]);
p2 += stride;
vst1_s16((int16_t *)p2, d[3]);
}
static INLINE void do_butterfly(const int16x8_t qIn0, const int16x8_t qIn1,
const int16_t first_const,
const int16_t second_const,
int16x8_t *const qOut0,
int16x8_t *const qOut1) {
int32x4_t q[4];
int16x4_t d[6];
d[0] = vget_low_s16(qIn0);
d[1] = vget_high_s16(qIn0);
d[2] = vget_low_s16(qIn1);
d[3] = vget_high_s16(qIn1);
// Note: using v{mul, mla, mls}l_n_s16 here slows down 35% with gcc 4.9.
d[4] = vdup_n_s16(first_const);
d[5] = vdup_n_s16(second_const);
q[0] = vmull_s16(d[0], d[4]);
q[1] = vmull_s16(d[1], d[4]);
q[0] = vmlsl_s16(q[0], d[2], d[5]);
q[1] = vmlsl_s16(q[1], d[3], d[5]);
q[2] = vmull_s16(d[0], d[5]);
q[3] = vmull_s16(d[1], d[5]);
q[2] = vmlal_s16(q[2], d[2], d[4]);
q[3] = vmlal_s16(q[3], d[3], d[4]);
*qOut0 = vcombine_s16(vrshrn_n_s32(q[0], DCT_CONST_BITS),
vrshrn_n_s32(q[1], DCT_CONST_BITS));
*qOut1 = vcombine_s16(vrshrn_n_s32(q[2], DCT_CONST_BITS),
vrshrn_n_s32(q[3], DCT_CONST_BITS));
}
static INLINE void load_s16x8q(const int16_t *in, int16x8_t *const s0,
int16x8_t *const s1, int16x8_t *const s2,
int16x8_t *const s3, int16x8_t *const s4,
int16x8_t *const s5, int16x8_t *const s6,
int16x8_t *const s7) {
*s0 = vld1q_s16(in);
in += 32;
*s1 = vld1q_s16(in);
in += 32;
*s2 = vld1q_s16(in);
in += 32;
*s3 = vld1q_s16(in);
in += 32;
*s4 = vld1q_s16(in);
in += 32;
*s5 = vld1q_s16(in);
in += 32;
*s6 = vld1q_s16(in);
in += 32;
*s7 = vld1q_s16(in);
}
static INLINE void transpose_and_store_s16_8x8(int16x8_t a0, int16x8_t a1,
int16x8_t a2, int16x8_t a3,
int16x8_t a4, int16x8_t a5,
int16x8_t a6, int16x8_t a7,
int16_t **out) {
transpose_s16_8x8(&a0, &a1, &a2, &a3, &a4, &a5, &a6, &a7);
vst1q_s16(*out, a0);
*out += 8;
vst1q_s16(*out, a1);
*out += 8;
vst1q_s16(*out, a2);
*out += 8;
vst1q_s16(*out, a3);
*out += 8;
vst1q_s16(*out, a4);
*out += 8;
vst1q_s16(*out, a5);
*out += 8;
vst1q_s16(*out, a6);
*out += 8;
vst1q_s16(*out, a7);
*out += 8;
}
static INLINE void idct32_transpose_pair(const int16_t *input, int16_t *t_buf) {
int i;
int16x8_t s0, s1, s2, s3, s4, s5, s6, s7;
for (i = 0; i < 4; i++, input += 8) {
load_s16x8q(input, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7);
transpose_and_store_s16_8x8(s0, s1, s2, s3, s4, s5, s6, s7, &t_buf);
}
}
#if CONFIG_VP9_HIGHBITDEPTH
static INLINE void load_s16x8q_tran_low(
const tran_low_t *in, int16x8_t *const s0, int16x8_t *const s1,
int16x8_t *const s2, int16x8_t *const s3, int16x8_t *const s4,
int16x8_t *const s5, int16x8_t *const s6, int16x8_t *const s7) {
*s0 = load_tran_low_to_s16q(in);
in += 32;
*s1 = load_tran_low_to_s16q(in);
in += 32;
*s2 = load_tran_low_to_s16q(in);
in += 32;
*s3 = load_tran_low_to_s16q(in);
in += 32;
*s4 = load_tran_low_to_s16q(in);
in += 32;
*s5 = load_tran_low_to_s16q(in);
in += 32;
*s6 = load_tran_low_to_s16q(in);
in += 32;
*s7 = load_tran_low_to_s16q(in);
}
static INLINE void idct32_transpose_pair_tran_low(const tran_low_t *input,
int16_t *t_buf) {
int i;
int16x8_t s0, s1, s2, s3, s4, s5, s6, s7;
for (i = 0; i < 4; i++, input += 8) {
load_s16x8q_tran_low(input, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7);
transpose_and_store_s16_8x8(s0, s1, s2, s3, s4, s5, s6, s7, &t_buf);
}
}
#else // !CONFIG_VP9_HIGHBITDEPTH
#define idct32_transpose_pair_tran_low idct32_transpose_pair
#endif // CONFIG_VP9_HIGHBITDEPTH
static INLINE void idct32_bands_end_1st_pass(int16_t *const out,
int16x8_t *const q) {
store_in_output(out, 16, 17, q[6], q[7]);
store_in_output(out, 14, 15, q[8], q[9]);
load_from_output(out, 30, 31, &q[0], &q[1]);
q[4] = vaddq_s16(q[2], q[1]);
q[5] = vaddq_s16(q[3], q[0]);
q[6] = vsubq_s16(q[3], q[0]);
q[7] = vsubq_s16(q[2], q[1]);
store_in_output(out, 30, 31, q[6], q[7]);
store_in_output(out, 0, 1, q[4], q[5]);
load_from_output(out, 12, 13, &q[0], &q[1]);
q[2] = vaddq_s16(q[10], q[1]);
q[3] = vaddq_s16(q[11], q[0]);
q[4] = vsubq_s16(q[11], q[0]);
q[5] = vsubq_s16(q[10], q[1]);
load_from_output(out, 18, 19, &q[0], &q[1]);
q[8] = vaddq_s16(q[4], q[1]);
q[9] = vaddq_s16(q[5], q[0]);
q[6] = vsubq_s16(q[5], q[0]);
q[7] = vsubq_s16(q[4], q[1]);
store_in_output(out, 18, 19, q[6], q[7]);
store_in_output(out, 12, 13, q[8], q[9]);
load_from_output(out, 28, 29, &q[0], &q[1]);
q[4] = vaddq_s16(q[2], q[1]);
q[5] = vaddq_s16(q[3], q[0]);
q[6] = vsubq_s16(q[3], q[0]);
q[7] = vsubq_s16(q[2], q[1]);
store_in_output(out, 28, 29, q[6], q[7]);
store_in_output(out, 2, 3, q[4], q[5]);
load_from_output(out, 10, 11, &q[0], &q[1]);
q[2] = vaddq_s16(q[12], q[1]);
q[3] = vaddq_s16(q[13], q[0]);
q[4] = vsubq_s16(q[13], q[0]);
q[5] = vsubq_s16(q[12], q[1]);
load_from_output(out, 20, 21, &q[0], &q[1]);
q[8] = vaddq_s16(q[4], q[1]);
q[9] = vaddq_s16(q[5], q[0]);
q[6] = vsubq_s16(q[5], q[0]);
q[7] = vsubq_s16(q[4], q[1]);
store_in_output(out, 20, 21, q[6], q[7]);
store_in_output(out, 10, 11, q[8], q[9]);
load_from_output(out, 26, 27, &q[0], &q[1]);
q[4] = vaddq_s16(q[2], q[1]);
q[5] = vaddq_s16(q[3], q[0]);
q[6] = vsubq_s16(q[3], q[0]);
q[7] = vsubq_s16(q[2], q[1]);
store_in_output(out, 26, 27, q[6], q[7]);
store_in_output(out, 4, 5, q[4], q[5]);
load_from_output(out, 8, 9, &q[0], &q[1]);
q[2] = vaddq_s16(q[14], q[1]);
q[3] = vaddq_s16(q[15], q[0]);
q[4] = vsubq_s16(q[15], q[0]);
q[5] = vsubq_s16(q[14], q[1]);
load_from_output(out, 22, 23, &q[0], &q[1]);
q[8] = vaddq_s16(q[4], q[1]);
q[9] = vaddq_s16(q[5], q[0]);
q[6] = vsubq_s16(q[5], q[0]);
q[7] = vsubq_s16(q[4], q[1]);
store_in_output(out, 22, 23, q[6], q[7]);
store_in_output(out, 8, 9, q[8], q[9]);
load_from_output(out, 24, 25, &q[0], &q[1]);
q[4] = vaddq_s16(q[2], q[1]);
q[5] = vaddq_s16(q[3], q[0]);
q[6] = vsubq_s16(q[3], q[0]);
q[7] = vsubq_s16(q[2], q[1]);
store_in_output(out, 24, 25, q[6], q[7]);
store_in_output(out, 6, 7, q[4], q[5]);
}
static INLINE void idct32_bands_end_2nd_pass(const int16_t *const out,
uint8_t *const dest,
const int stride,
int16x8_t *const q) {
uint8_t *dest0 = dest + 0 * stride;
uint8_t *dest1 = dest + 31 * stride;
uint8_t *dest2 = dest + 16 * stride;
uint8_t *dest3 = dest + 15 * stride;
const int str2 = stride << 1;
store_combine_center_results(dest2, dest3, stride, q[6], q[7], q[8], q[9]);
dest2 += str2;
dest3 -= str2;
load_from_output(out, 30, 31, &q[0], &q[1]);
q[4] = vaddq_s16(q[2], q[1]);
q[5] = vaddq_s16(q[3], q[0]);
q[6] = vsubq_s16(q[3], q[0]);
q[7] = vsubq_s16(q[2], q[1]);
store_combine_extreme_results(dest0, dest1, stride, q[4], q[5], q[6], q[7]);
dest0 += str2;
dest1 -= str2;
load_from_output(out, 12, 13, &q[0], &q[1]);
q[2] = vaddq_s16(q[10], q[1]);
q[3] = vaddq_s16(q[11], q[0]);
q[4] = vsubq_s16(q[11], q[0]);
q[5] = vsubq_s16(q[10], q[1]);
load_from_output(out, 18, 19, &q[0], &q[1]);
q[8] = vaddq_s16(q[4], q[1]);
q[9] = vaddq_s16(q[5], q[0]);
q[6] = vsubq_s16(q[5], q[0]);
q[7] = vsubq_s16(q[4], q[1]);
store_combine_center_results(dest2, dest3, stride, q[6], q[7], q[8], q[9]);
dest2 += str2;
dest3 -= str2;
load_from_output(out, 28, 29, &q[0], &q[1]);
q[4] = vaddq_s16(q[2], q[1]);
q[5] = vaddq_s16(q[3], q[0]);
q[6] = vsubq_s16(q[3], q[0]);
q[7] = vsubq_s16(q[2], q[1]);
store_combine_extreme_results(dest0, dest1, stride, q[4], q[5], q[6], q[7]);
dest0 += str2;
dest1 -= str2;
load_from_output(out, 10, 11, &q[0], &q[1]);
q[2] = vaddq_s16(q[12], q[1]);
q[3] = vaddq_s16(q[13], q[0]);
q[4] = vsubq_s16(q[13], q[0]);
q[5] = vsubq_s16(q[12], q[1]);
load_from_output(out, 20, 21, &q[0], &q[1]);
q[8] = vaddq_s16(q[4], q[1]);
q[9] = vaddq_s16(q[5], q[0]);
q[6] = vsubq_s16(q[5], q[0]);
q[7] = vsubq_s16(q[4], q[1]);
store_combine_center_results(dest2, dest3, stride, q[6], q[7], q[8], q[9]);
dest2 += str2;
dest3 -= str2;
load_from_output(out, 26, 27, &q[0], &q[1]);
q[4] = vaddq_s16(q[2], q[1]);
q[5] = vaddq_s16(q[3], q[0]);
q[6] = vsubq_s16(q[3], q[0]);
q[7] = vsubq_s16(q[2], q[1]);
store_combine_extreme_results(dest0, dest1, stride, q[4], q[5], q[6], q[7]);
dest0 += str2;
dest1 -= str2;
load_from_output(out, 8, 9, &q[0], &q[1]);
q[2] = vaddq_s16(q[14], q[1]);
q[3] = vaddq_s16(q[15], q[0]);
q[4] = vsubq_s16(q[15], q[0]);
q[5] = vsubq_s16(q[14], q[1]);
load_from_output(out, 22, 23, &q[0], &q[1]);
q[8] = vaddq_s16(q[4], q[1]);
q[9] = vaddq_s16(q[5], q[0]);
q[6] = vsubq_s16(q[5], q[0]);
q[7] = vsubq_s16(q[4], q[1]);
store_combine_center_results(dest2, dest3, stride, q[6], q[7], q[8], q[9]);
load_from_output(out, 24, 25, &q[0], &q[1]);
q[4] = vaddq_s16(q[2], q[1]);
q[5] = vaddq_s16(q[3], q[0]);
q[6] = vsubq_s16(q[3], q[0]);
q[7] = vsubq_s16(q[2], q[1]);
store_combine_extreme_results(dest0, dest1, stride, q[4], q[5], q[6], q[7]);
}
void vpx_idct32x32_1024_add_neon(const tran_low_t *input, uint8_t *dest,
int stride) {
int i, idct32_pass_loop;
int16_t trans_buf[32 * 8];
int16_t pass1[32 * 32];
int16_t pass2[32 * 32];
const int16_t *input_pass2 = pass1; // input of pass2 is the result of pass1
int16_t *out;
int16x8_t q[16];
for (idct32_pass_loop = 0, out = pass1; idct32_pass_loop < 2;
idct32_pass_loop++, out = pass2) {
for (i = 0; i < 4; i++, out += 8) { // idct32_bands_loop
if (idct32_pass_loop == 0) {
idct32_transpose_pair_tran_low(input, trans_buf);
input += 32 * 8;
} else {
idct32_transpose_pair(input_pass2, trans_buf);
input_pass2 += 32 * 8;
}
// -----------------------------------------
// BLOCK A: 16-19,28-31
// -----------------------------------------
// generate 16,17,30,31
// part of stage 1
load_from_transformed(trans_buf, 1, 31, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_31_64, cospi_1_64, &q[0], &q[2]);
load_from_transformed(trans_buf, 17, 15, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_15_64, cospi_17_64, &q[1], &q[3]);
// part of stage 2
q[4] = vaddq_s16(q[0], q[1]);
q[13] = vsubq_s16(q[0], q[1]);
q[6] = vaddq_s16(q[2], q[3]);
q[14] = vsubq_s16(q[2], q[3]);
// part of stage 3
do_butterfly(q[14], q[13], cospi_28_64, cospi_4_64, &q[5], &q[7]);
// generate 18,19,28,29
// part of stage 1
load_from_transformed(trans_buf, 9, 23, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_23_64, cospi_9_64, &q[0], &q[2]);
load_from_transformed(trans_buf, 25, 7, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_7_64, cospi_25_64, &q[1], &q[3]);
// part of stage 2
q[13] = vsubq_s16(q[3], q[2]);
q[3] = vaddq_s16(q[3], q[2]);
q[14] = vsubq_s16(q[1], q[0]);
q[2] = vaddq_s16(q[1], q[0]);
// part of stage 3
do_butterfly(q[14], q[13], -cospi_4_64, -cospi_28_64, &q[1], &q[0]);
// part of stage 4
q[8] = vaddq_s16(q[4], q[2]);
q[9] = vaddq_s16(q[5], q[0]);
q[10] = vaddq_s16(q[7], q[1]);
q[15] = vaddq_s16(q[6], q[3]);
q[13] = vsubq_s16(q[5], q[0]);
q[14] = vsubq_s16(q[7], q[1]);
store_in_output(out, 16, 31, q[8], q[15]);
store_in_output(out, 17, 30, q[9], q[10]);
// part of stage 5
do_butterfly(q[14], q[13], cospi_24_64, cospi_8_64, &q[0], &q[1]);
store_in_output(out, 29, 18, q[1], q[0]);
// part of stage 4
q[13] = vsubq_s16(q[4], q[2]);
q[14] = vsubq_s16(q[6], q[3]);
// part of stage 5
do_butterfly(q[14], q[13], cospi_24_64, cospi_8_64, &q[4], &q[6]);
store_in_output(out, 19, 28, q[4], q[6]);
// -----------------------------------------
// BLOCK B: 20-23,24-27
// -----------------------------------------
// generate 20,21,26,27
// part of stage 1
load_from_transformed(trans_buf, 5, 27, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_27_64, cospi_5_64, &q[0], &q[2]);
load_from_transformed(trans_buf, 21, 11, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_11_64, cospi_21_64, &q[1], &q[3]);
// part of stage 2
q[13] = vsubq_s16(q[0], q[1]);
q[0] = vaddq_s16(q[0], q[1]);
q[14] = vsubq_s16(q[2], q[3]);
q[2] = vaddq_s16(q[2], q[3]);
// part of stage 3
do_butterfly(q[14], q[13], cospi_12_64, cospi_20_64, &q[1], &q[3]);
// generate 22,23,24,25
// part of stage 1
load_from_transformed(trans_buf, 13, 19, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_19_64, cospi_13_64, &q[5], &q[7]);
load_from_transformed(trans_buf, 29, 3, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_3_64, cospi_29_64, &q[4], &q[6]);
// part of stage 2
q[14] = vsubq_s16(q[4], q[5]);
q[5] = vaddq_s16(q[4], q[5]);
q[13] = vsubq_s16(q[6], q[7]);
q[6] = vaddq_s16(q[6], q[7]);
// part of stage 3
do_butterfly(q[14], q[13], -cospi_20_64, -cospi_12_64, &q[4], &q[7]);
// part of stage 4
q[10] = vaddq_s16(q[7], q[1]);
q[11] = vaddq_s16(q[5], q[0]);
q[12] = vaddq_s16(q[6], q[2]);
q[15] = vaddq_s16(q[4], q[3]);
// part of stage 6
load_from_output(out, 16, 17, &q[14], &q[13]);
q[8] = vaddq_s16(q[14], q[11]);
q[9] = vaddq_s16(q[13], q[10]);
q[13] = vsubq_s16(q[13], q[10]);
q[11] = vsubq_s16(q[14], q[11]);
store_in_output(out, 17, 16, q[9], q[8]);
load_from_output(out, 30, 31, &q[14], &q[9]);
q[8] = vsubq_s16(q[9], q[12]);
q[10] = vaddq_s16(q[14], q[15]);
q[14] = vsubq_s16(q[14], q[15]);
q[12] = vaddq_s16(q[9], q[12]);
store_in_output(out, 30, 31, q[10], q[12]);
// part of stage 7
do_butterfly(q[14], q[13], cospi_16_64, cospi_16_64, &q[13], &q[14]);
store_in_output(out, 25, 22, q[14], q[13]);
do_butterfly(q[8], q[11], cospi_16_64, cospi_16_64, &q[13], &q[14]);
store_in_output(out, 24, 23, q[14], q[13]);
// part of stage 4
q[14] = vsubq_s16(q[5], q[0]);
q[13] = vsubq_s16(q[6], q[2]);
do_butterfly(q[14], q[13], -cospi_8_64, -cospi_24_64, &q[5], &q[6]);
q[14] = vsubq_s16(q[7], q[1]);
q[13] = vsubq_s16(q[4], q[3]);
do_butterfly(q[14], q[13], -cospi_8_64, -cospi_24_64, &q[0], &q[1]);
// part of stage 6
load_from_output(out, 18, 19, &q[14], &q[13]);
q[8] = vaddq_s16(q[14], q[1]);
q[9] = vaddq_s16(q[13], q[6]);
q[13] = vsubq_s16(q[13], q[6]);
q[1] = vsubq_s16(q[14], q[1]);
store_in_output(out, 18, 19, q[8], q[9]);
load_from_output(out, 28, 29, &q[8], &q[9]);
q[14] = vsubq_s16(q[8], q[5]);
q[10] = vaddq_s16(q[8], q[5]);
q[11] = vaddq_s16(q[9], q[0]);
q[0] = vsubq_s16(q[9], q[0]);
store_in_output(out, 28, 29, q[10], q[11]);
// part of stage 7
do_butterfly(q[14], q[13], cospi_16_64, cospi_16_64, &q[13], &q[14]);
store_in_output(out, 20, 27, q[13], q[14]);
do_butterfly(q[0], q[1], cospi_16_64, cospi_16_64, &q[1], &q[0]);
store_in_output(out, 21, 26, q[1], q[0]);
// -----------------------------------------
// BLOCK C: 8-10,11-15
// -----------------------------------------
// generate 8,9,14,15
// part of stage 2
load_from_transformed(trans_buf, 2, 30, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_30_64, cospi_2_64, &q[0], &q[2]);
load_from_transformed(trans_buf, 18, 14, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_14_64, cospi_18_64, &q[1], &q[3]);
// part of stage 3
q[13] = vsubq_s16(q[0], q[1]);
q[0] = vaddq_s16(q[0], q[1]);
q[14] = vsubq_s16(q[2], q[3]);
q[2] = vaddq_s16(q[2], q[3]);
// part of stage 4
do_butterfly(q[14], q[13], cospi_24_64, cospi_8_64, &q[1], &q[3]);
// generate 10,11,12,13
// part of stage 2
load_from_transformed(trans_buf, 10, 22, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_22_64, cospi_10_64, &q[5], &q[7]);
load_from_transformed(trans_buf, 26, 6, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_6_64, cospi_26_64, &q[4], &q[6]);
// part of stage 3
q[14] = vsubq_s16(q[4], q[5]);
q[5] = vaddq_s16(q[4], q[5]);
q[13] = vsubq_s16(q[6], q[7]);
q[6] = vaddq_s16(q[6], q[7]);
// part of stage 4
do_butterfly(q[14], q[13], -cospi_8_64, -cospi_24_64, &q[4], &q[7]);
// part of stage 5
q[8] = vaddq_s16(q[0], q[5]);
q[9] = vaddq_s16(q[1], q[7]);
q[13] = vsubq_s16(q[1], q[7]);
q[14] = vsubq_s16(q[3], q[4]);
q[10] = vaddq_s16(q[3], q[4]);
q[15] = vaddq_s16(q[2], q[6]);
store_in_output(out, 8, 15, q[8], q[15]);
store_in_output(out, 9, 14, q[9], q[10]);
// part of stage 6
do_butterfly(q[14], q[13], cospi_16_64, cospi_16_64, &q[1], &q[3]);
store_in_output(out, 13, 10, q[3], q[1]);
q[13] = vsubq_s16(q[0], q[5]);
q[14] = vsubq_s16(q[2], q[6]);
do_butterfly(q[14], q[13], cospi_16_64, cospi_16_64, &q[1], &q[3]);
store_in_output(out, 11, 12, q[1], q[3]);
// -----------------------------------------
// BLOCK D: 0-3,4-7
// -----------------------------------------
// generate 4,5,6,7
// part of stage 3
load_from_transformed(trans_buf, 4, 28, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_28_64, cospi_4_64, &q[0], &q[2]);
load_from_transformed(trans_buf, 20, 12, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_12_64, cospi_20_64, &q[1], &q[3]);
// part of stage 4
q[13] = vsubq_s16(q[0], q[1]);
q[0] = vaddq_s16(q[0], q[1]);
q[14] = vsubq_s16(q[2], q[3]);
q[2] = vaddq_s16(q[2], q[3]);
// part of stage 5
do_butterfly(q[14], q[13], cospi_16_64, cospi_16_64, &q[1], &q[3]);
// generate 0,1,2,3
// part of stage 4
load_from_transformed(trans_buf, 0, 16, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_16_64, cospi_16_64, &q[5], &q[7]);
load_from_transformed(trans_buf, 8, 24, &q[14], &q[13]);
do_butterfly(q[14], q[13], cospi_24_64, cospi_8_64, &q[14], &q[6]);
// part of stage 5
q[4] = vaddq_s16(q[7], q[6]);
q[7] = vsubq_s16(q[7], q[6]);
q[6] = vsubq_s16(q[5], q[14]);
q[5] = vaddq_s16(q[5], q[14]);
// part of stage 6
q[8] = vaddq_s16(q[4], q[2]);
q[9] = vaddq_s16(q[5], q[3]);
q[10] = vaddq_s16(q[6], q[1]);
q[11] = vaddq_s16(q[7], q[0]);
q[12] = vsubq_s16(q[7], q[0]);
q[13] = vsubq_s16(q[6], q[1]);
q[14] = vsubq_s16(q[5], q[3]);
q[15] = vsubq_s16(q[4], q[2]);
// part of stage 7
load_from_output(out, 14, 15, &q[0], &q[1]);
q[2] = vaddq_s16(q[8], q[1]);
q[3] = vaddq_s16(q[9], q[0]);
q[4] = vsubq_s16(q[9], q[0]);
q[5] = vsubq_s16(q[8], q[1]);
load_from_output(out, 16, 17, &q[0], &q[1]);
q[8] = vaddq_s16(q[4], q[1]);
q[9] = vaddq_s16(q[5], q[0]);
q[6] = vsubq_s16(q[5], q[0]);
q[7] = vsubq_s16(q[4], q[1]);
if (idct32_pass_loop == 0) {
idct32_bands_end_1st_pass(out, q);
} else {
idct32_bands_end_2nd_pass(out, dest, stride, q);
dest += 8;
}
}
}
}