ref: b987bc36af383a06976164ab32c233e2c769018d
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"
#define LOAD_FROM_TRANSPOSED(prev, first, second) \
q14s16 = vld1q_s16(trans_buf + first * 8); \
q13s16 = vld1q_s16(trans_buf + second * 8);
#define LOAD_FROM_OUTPUT(prev, first, second, qA, qB) \
qA = vld1q_s16(out + first * 32); \
qB = vld1q_s16(out + second * 32);
#define STORE_IN_OUTPUT(prev, first, second, qA, qB) \
vst1q_s16(out + first * 32, qA); \
vst1q_s16(out + second * 32, qB);
#define STORE_COMBINE_CENTER_RESULTS(r10, r9) \
__STORE_COMBINE_CENTER_RESULTS(r10, r9, stride, q6s16, q7s16, q8s16, q9s16);
static INLINE void __STORE_COMBINE_CENTER_RESULTS(uint8_t *p1, uint8_t *p2,
int stride, int16x8_t q6s16,
int16x8_t q7s16,
int16x8_t q8s16,
int16x8_t q9s16) {
int16x4_t d8s16, d9s16, d10s16, d11s16;
d8s16 = vld1_s16((int16_t *)p1);
p1 += stride;
d11s16 = vld1_s16((int16_t *)p2);
p2 -= stride;
d9s16 = vld1_s16((int16_t *)p1);
d10s16 = vld1_s16((int16_t *)p2);
q7s16 = vrshrq_n_s16(q7s16, 6);
q8s16 = vrshrq_n_s16(q8s16, 6);
q9s16 = vrshrq_n_s16(q9s16, 6);
q6s16 = vrshrq_n_s16(q6s16, 6);
q7s16 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q7s16), vreinterpret_u8_s16(d9s16)));
q8s16 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q8s16), vreinterpret_u8_s16(d10s16)));
q9s16 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q9s16), vreinterpret_u8_s16(d11s16)));
q6s16 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q6s16), vreinterpret_u8_s16(d8s16)));
d9s16 = vreinterpret_s16_u8(vqmovun_s16(q7s16));
d10s16 = vreinterpret_s16_u8(vqmovun_s16(q8s16));
d11s16 = vreinterpret_s16_u8(vqmovun_s16(q9s16));
d8s16 = vreinterpret_s16_u8(vqmovun_s16(q6s16));
vst1_s16((int16_t *)p1, d9s16);
p1 -= stride;
vst1_s16((int16_t *)p2, d10s16);
p2 += stride;
vst1_s16((int16_t *)p1, d8s16);
vst1_s16((int16_t *)p2, d11s16);
}
#define STORE_COMBINE_EXTREME_RESULTS(r7, r6) \
__STORE_COMBINE_EXTREME_RESULTS(r7, r6, stride, q4s16, q5s16, q6s16, q7s16);
static INLINE void __STORE_COMBINE_EXTREME_RESULTS(uint8_t *p1, uint8_t *p2,
int stride, int16x8_t q4s16,
int16x8_t q5s16,
int16x8_t q6s16,
int16x8_t q7s16) {
int16x4_t d4s16, d5s16, d6s16, d7s16;
d4s16 = vld1_s16((int16_t *)p1);
p1 += stride;
d7s16 = vld1_s16((int16_t *)p2);
p2 -= stride;
d5s16 = vld1_s16((int16_t *)p1);
d6s16 = vld1_s16((int16_t *)p2);
q5s16 = vrshrq_n_s16(q5s16, 6);
q6s16 = vrshrq_n_s16(q6s16, 6);
q7s16 = vrshrq_n_s16(q7s16, 6);
q4s16 = vrshrq_n_s16(q4s16, 6);
q5s16 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q5s16), vreinterpret_u8_s16(d5s16)));
q6s16 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q6s16), vreinterpret_u8_s16(d6s16)));
q7s16 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q7s16), vreinterpret_u8_s16(d7s16)));
q4s16 = vreinterpretq_s16_u16(
vaddw_u8(vreinterpretq_u16_s16(q4s16), vreinterpret_u8_s16(d4s16)));
d5s16 = vreinterpret_s16_u8(vqmovun_s16(q5s16));
d6s16 = vreinterpret_s16_u8(vqmovun_s16(q6s16));
d7s16 = vreinterpret_s16_u8(vqmovun_s16(q7s16));
d4s16 = vreinterpret_s16_u8(vqmovun_s16(q4s16));
vst1_s16((int16_t *)p1, d5s16);
p1 -= stride;
vst1_s16((int16_t *)p2, d6s16);
p2 += stride;
vst1_s16((int16_t *)p2, d7s16);
vst1_s16((int16_t *)p1, d4s16);
}
#define DO_BUTTERFLY_STD(const_1, const_2, qA, qB) \
DO_BUTTERFLY(q14s16, q13s16, const_1, const_2, qA, qB);
static INLINE void DO_BUTTERFLY(int16x8_t q14s16, int16x8_t q13s16,
int16_t first_const, int16_t second_const,
int16x8_t *qAs16, int16x8_t *qBs16) {
int16x4_t d30s16, d31s16;
int32x4_t q8s32, q9s32, q10s32, q11s32, q12s32, q15s32;
int16x4_t dCs16, dDs16, dAs16, dBs16;
dCs16 = vget_low_s16(q14s16);
dDs16 = vget_high_s16(q14s16);
dAs16 = vget_low_s16(q13s16);
dBs16 = vget_high_s16(q13s16);
d30s16 = vdup_n_s16(first_const);
d31s16 = vdup_n_s16(second_const);
q8s32 = vmull_s16(dCs16, d30s16);
q10s32 = vmull_s16(dAs16, d31s16);
q9s32 = vmull_s16(dDs16, d30s16);
q11s32 = vmull_s16(dBs16, d31s16);
q12s32 = vmull_s16(dCs16, d31s16);
q8s32 = vsubq_s32(q8s32, q10s32);
q9s32 = vsubq_s32(q9s32, q11s32);
q10s32 = vmull_s16(dDs16, d31s16);
q11s32 = vmull_s16(dAs16, d30s16);
q15s32 = vmull_s16(dBs16, d30s16);
q11s32 = vaddq_s32(q12s32, q11s32);
q10s32 = vaddq_s32(q10s32, q15s32);
*qAs16 = vcombine_s16(vrshrn_n_s32(q8s32, 14), vrshrn_n_s32(q9s32, 14));
*qBs16 = vcombine_s16(vrshrn_n_s32(q11s32, 14), vrshrn_n_s32(q10s32, 14));
}
static INLINE void load_s16x8q(const int16_t *in, int16x8_t *s0, int16x8_t *s1,
int16x8_t *s2, int16x8_t *s3, int16x8_t *s4,
int16x8_t *s5, int16x8_t *s6, int16x8_t *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 *s0,
int16x8_t *s1, int16x8_t *s2,
int16x8_t *s3, int16x8_t *s4,
int16x8_t *s5, int16x8_t *s6,
int16x8_t *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 *out, int16x8_t q2s16,
int16x8_t q3s16, int16x8_t q6s16,
int16x8_t q7s16, int16x8_t q8s16,
int16x8_t q9s16, int16x8_t q10s16,
int16x8_t q11s16, int16x8_t q12s16,
int16x8_t q13s16, int16x8_t q14s16,
int16x8_t q15s16) {
int16x8_t q0s16, q1s16, q4s16, q5s16;
STORE_IN_OUTPUT(17, 16, 17, q6s16, q7s16);
STORE_IN_OUTPUT(17, 14, 15, q8s16, q9s16);
LOAD_FROM_OUTPUT(15, 30, 31, q0s16, q1s16);
q4s16 = vaddq_s16(q2s16, q1s16);
q5s16 = vaddq_s16(q3s16, q0s16);
q6s16 = vsubq_s16(q3s16, q0s16);
q7s16 = vsubq_s16(q2s16, q1s16);
STORE_IN_OUTPUT(31, 30, 31, q6s16, q7s16);
STORE_IN_OUTPUT(31, 0, 1, q4s16, q5s16);
LOAD_FROM_OUTPUT(1, 12, 13, q0s16, q1s16);
q2s16 = vaddq_s16(q10s16, q1s16);
q3s16 = vaddq_s16(q11s16, q0s16);
q4s16 = vsubq_s16(q11s16, q0s16);
q5s16 = vsubq_s16(q10s16, q1s16);
LOAD_FROM_OUTPUT(13, 18, 19, q0s16, q1s16);
q8s16 = vaddq_s16(q4s16, q1s16);
q9s16 = vaddq_s16(q5s16, q0s16);
q6s16 = vsubq_s16(q5s16, q0s16);
q7s16 = vsubq_s16(q4s16, q1s16);
STORE_IN_OUTPUT(19, 18, 19, q6s16, q7s16);
STORE_IN_OUTPUT(19, 12, 13, q8s16, q9s16);
LOAD_FROM_OUTPUT(13, 28, 29, q0s16, q1s16);
q4s16 = vaddq_s16(q2s16, q1s16);
q5s16 = vaddq_s16(q3s16, q0s16);
q6s16 = vsubq_s16(q3s16, q0s16);
q7s16 = vsubq_s16(q2s16, q1s16);
STORE_IN_OUTPUT(29, 28, 29, q6s16, q7s16);
STORE_IN_OUTPUT(29, 2, 3, q4s16, q5s16);
LOAD_FROM_OUTPUT(3, 10, 11, q0s16, q1s16);
q2s16 = vaddq_s16(q12s16, q1s16);
q3s16 = vaddq_s16(q13s16, q0s16);
q4s16 = vsubq_s16(q13s16, q0s16);
q5s16 = vsubq_s16(q12s16, q1s16);
LOAD_FROM_OUTPUT(11, 20, 21, q0s16, q1s16);
q8s16 = vaddq_s16(q4s16, q1s16);
q9s16 = vaddq_s16(q5s16, q0s16);
q6s16 = vsubq_s16(q5s16, q0s16);
q7s16 = vsubq_s16(q4s16, q1s16);
STORE_IN_OUTPUT(21, 20, 21, q6s16, q7s16);
STORE_IN_OUTPUT(21, 10, 11, q8s16, q9s16);
LOAD_FROM_OUTPUT(11, 26, 27, q0s16, q1s16);
q4s16 = vaddq_s16(q2s16, q1s16);
q5s16 = vaddq_s16(q3s16, q0s16);
q6s16 = vsubq_s16(q3s16, q0s16);
q7s16 = vsubq_s16(q2s16, q1s16);
STORE_IN_OUTPUT(27, 26, 27, q6s16, q7s16);
STORE_IN_OUTPUT(27, 4, 5, q4s16, q5s16);
LOAD_FROM_OUTPUT(5, 8, 9, q0s16, q1s16);
q2s16 = vaddq_s16(q14s16, q1s16);
q3s16 = vaddq_s16(q15s16, q0s16);
q4s16 = vsubq_s16(q15s16, q0s16);
q5s16 = vsubq_s16(q14s16, q1s16);
LOAD_FROM_OUTPUT(9, 22, 23, q0s16, q1s16);
q8s16 = vaddq_s16(q4s16, q1s16);
q9s16 = vaddq_s16(q5s16, q0s16);
q6s16 = vsubq_s16(q5s16, q0s16);
q7s16 = vsubq_s16(q4s16, q1s16);
STORE_IN_OUTPUT(23, 22, 23, q6s16, q7s16);
STORE_IN_OUTPUT(23, 8, 9, q8s16, q9s16);
LOAD_FROM_OUTPUT(9, 24, 25, q0s16, q1s16);
q4s16 = vaddq_s16(q2s16, q1s16);
q5s16 = vaddq_s16(q3s16, q0s16);
q6s16 = vsubq_s16(q3s16, q0s16);
q7s16 = vsubq_s16(q2s16, q1s16);
STORE_IN_OUTPUT(25, 24, 25, q6s16, q7s16);
STORE_IN_OUTPUT(25, 6, 7, q4s16, q5s16);
}
static INLINE void idct32_bands_end_2nd_pass(
int16_t *out, uint8_t *dest, int stride, int16x8_t q2s16, int16x8_t q3s16,
int16x8_t q6s16, int16x8_t q7s16, int16x8_t q8s16, int16x8_t q9s16,
int16x8_t q10s16, int16x8_t q11s16, int16x8_t q12s16, int16x8_t q13s16,
int16x8_t q14s16, int16x8_t q15s16) {
uint8_t *r6 = dest + 31 * stride;
uint8_t *r7 = dest /* + 0 * stride*/;
uint8_t *r9 = dest + 15 * stride;
uint8_t *r10 = dest + 16 * stride;
int str2 = stride << 1;
int16x8_t q0s16, q1s16, q4s16, q5s16;
STORE_COMBINE_CENTER_RESULTS(r10, r9);
r10 += str2;
r9 -= str2;
LOAD_FROM_OUTPUT(17, 30, 31, q0s16, q1s16)
q4s16 = vaddq_s16(q2s16, q1s16);
q5s16 = vaddq_s16(q3s16, q0s16);
q6s16 = vsubq_s16(q3s16, q0s16);
q7s16 = vsubq_s16(q2s16, q1s16);
STORE_COMBINE_EXTREME_RESULTS(r7, r6);
r7 += str2;
r6 -= str2;
LOAD_FROM_OUTPUT(31, 12, 13, q0s16, q1s16)
q2s16 = vaddq_s16(q10s16, q1s16);
q3s16 = vaddq_s16(q11s16, q0s16);
q4s16 = vsubq_s16(q11s16, q0s16);
q5s16 = vsubq_s16(q10s16, q1s16);
LOAD_FROM_OUTPUT(13, 18, 19, q0s16, q1s16)
q8s16 = vaddq_s16(q4s16, q1s16);
q9s16 = vaddq_s16(q5s16, q0s16);
q6s16 = vsubq_s16(q5s16, q0s16);
q7s16 = vsubq_s16(q4s16, q1s16);
STORE_COMBINE_CENTER_RESULTS(r10, r9);
r10 += str2;
r9 -= str2;
LOAD_FROM_OUTPUT(19, 28, 29, q0s16, q1s16)
q4s16 = vaddq_s16(q2s16, q1s16);
q5s16 = vaddq_s16(q3s16, q0s16);
q6s16 = vsubq_s16(q3s16, q0s16);
q7s16 = vsubq_s16(q2s16, q1s16);
STORE_COMBINE_EXTREME_RESULTS(r7, r6);
r7 += str2;
r6 -= str2;
LOAD_FROM_OUTPUT(29, 10, 11, q0s16, q1s16)
q2s16 = vaddq_s16(q12s16, q1s16);
q3s16 = vaddq_s16(q13s16, q0s16);
q4s16 = vsubq_s16(q13s16, q0s16);
q5s16 = vsubq_s16(q12s16, q1s16);
LOAD_FROM_OUTPUT(11, 20, 21, q0s16, q1s16)
q8s16 = vaddq_s16(q4s16, q1s16);
q9s16 = vaddq_s16(q5s16, q0s16);
q6s16 = vsubq_s16(q5s16, q0s16);
q7s16 = vsubq_s16(q4s16, q1s16);
STORE_COMBINE_CENTER_RESULTS(r10, r9);
r10 += str2;
r9 -= str2;
LOAD_FROM_OUTPUT(21, 26, 27, q0s16, q1s16)
q4s16 = vaddq_s16(q2s16, q1s16);
q5s16 = vaddq_s16(q3s16, q0s16);
q6s16 = vsubq_s16(q3s16, q0s16);
q7s16 = vsubq_s16(q2s16, q1s16);
STORE_COMBINE_EXTREME_RESULTS(r7, r6);
r7 += str2;
r6 -= str2;
LOAD_FROM_OUTPUT(27, 8, 9, q0s16, q1s16)
q2s16 = vaddq_s16(q14s16, q1s16);
q3s16 = vaddq_s16(q15s16, q0s16);
q4s16 = vsubq_s16(q15s16, q0s16);
q5s16 = vsubq_s16(q14s16, q1s16);
LOAD_FROM_OUTPUT(9, 22, 23, q0s16, q1s16)
q8s16 = vaddq_s16(q4s16, q1s16);
q9s16 = vaddq_s16(q5s16, q0s16);
q6s16 = vsubq_s16(q5s16, q0s16);
q7s16 = vsubq_s16(q4s16, q1s16);
STORE_COMBINE_CENTER_RESULTS(r10, r9);
LOAD_FROM_OUTPUT(23, 24, 25, q0s16, q1s16)
q4s16 = vaddq_s16(q2s16, q1s16);
q5s16 = vaddq_s16(q3s16, q0s16);
q6s16 = vsubq_s16(q3s16, q0s16);
q7s16 = vsubq_s16(q2s16, q1s16);
STORE_COMBINE_EXTREME_RESULTS(r7, r6);
}
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 q0s16, q1s16, q2s16, q3s16, q4s16, q5s16, q6s16, q7s16;
int16x8_t q8s16, q9s16, q10s16, q11s16, q12s16, q13s16, q14s16, q15s16;
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_TRANSPOSED(0, 1, 31)
DO_BUTTERFLY_STD(cospi_31_64, cospi_1_64, &q0s16, &q2s16)
LOAD_FROM_TRANSPOSED(31, 17, 15)
DO_BUTTERFLY_STD(cospi_15_64, cospi_17_64, &q1s16, &q3s16)
// part of stage 2
q4s16 = vaddq_s16(q0s16, q1s16);
q13s16 = vsubq_s16(q0s16, q1s16);
q6s16 = vaddq_s16(q2s16, q3s16);
q14s16 = vsubq_s16(q2s16, q3s16);
// part of stage 3
DO_BUTTERFLY_STD(cospi_28_64, cospi_4_64, &q5s16, &q7s16)
// generate 18,19,28,29
// part of stage 1
LOAD_FROM_TRANSPOSED(15, 9, 23)
DO_BUTTERFLY_STD(cospi_23_64, cospi_9_64, &q0s16, &q2s16)
LOAD_FROM_TRANSPOSED(23, 25, 7)
DO_BUTTERFLY_STD(cospi_7_64, cospi_25_64, &q1s16, &q3s16)
// part of stage 2
q13s16 = vsubq_s16(q3s16, q2s16);
q3s16 = vaddq_s16(q3s16, q2s16);
q14s16 = vsubq_s16(q1s16, q0s16);
q2s16 = vaddq_s16(q1s16, q0s16);
// part of stage 3
DO_BUTTERFLY_STD(-cospi_4_64, -cospi_28_64, &q1s16, &q0s16)
// part of stage 4
q8s16 = vaddq_s16(q4s16, q2s16);
q9s16 = vaddq_s16(q5s16, q0s16);
q10s16 = vaddq_s16(q7s16, q1s16);
q15s16 = vaddq_s16(q6s16, q3s16);
q13s16 = vsubq_s16(q5s16, q0s16);
q14s16 = vsubq_s16(q7s16, q1s16);
STORE_IN_OUTPUT(0, 16, 31, q8s16, q15s16)
STORE_IN_OUTPUT(31, 17, 30, q9s16, q10s16)
// part of stage 5
DO_BUTTERFLY_STD(cospi_24_64, cospi_8_64, &q0s16, &q1s16)
STORE_IN_OUTPUT(30, 29, 18, q1s16, q0s16)
// part of stage 4
q13s16 = vsubq_s16(q4s16, q2s16);
q14s16 = vsubq_s16(q6s16, q3s16);
// part of stage 5
DO_BUTTERFLY_STD(cospi_24_64, cospi_8_64, &q4s16, &q6s16)
STORE_IN_OUTPUT(18, 19, 28, q4s16, q6s16)
// -----------------------------------------
// BLOCK B: 20-23,24-27
// -----------------------------------------
// generate 20,21,26,27
// part of stage 1
LOAD_FROM_TRANSPOSED(7, 5, 27)
DO_BUTTERFLY_STD(cospi_27_64, cospi_5_64, &q0s16, &q2s16)
LOAD_FROM_TRANSPOSED(27, 21, 11)
DO_BUTTERFLY_STD(cospi_11_64, cospi_21_64, &q1s16, &q3s16)
// part of stage 2
q13s16 = vsubq_s16(q0s16, q1s16);
q0s16 = vaddq_s16(q0s16, q1s16);
q14s16 = vsubq_s16(q2s16, q3s16);
q2s16 = vaddq_s16(q2s16, q3s16);
// part of stage 3
DO_BUTTERFLY_STD(cospi_12_64, cospi_20_64, &q1s16, &q3s16)
// generate 22,23,24,25
// part of stage 1
LOAD_FROM_TRANSPOSED(11, 13, 19)
DO_BUTTERFLY_STD(cospi_19_64, cospi_13_64, &q5s16, &q7s16)
LOAD_FROM_TRANSPOSED(19, 29, 3)
DO_BUTTERFLY_STD(cospi_3_64, cospi_29_64, &q4s16, &q6s16)
// part of stage 2
q14s16 = vsubq_s16(q4s16, q5s16);
q5s16 = vaddq_s16(q4s16, q5s16);
q13s16 = vsubq_s16(q6s16, q7s16);
q6s16 = vaddq_s16(q6s16, q7s16);
// part of stage 3
DO_BUTTERFLY_STD(-cospi_20_64, -cospi_12_64, &q4s16, &q7s16)
// part of stage 4
q10s16 = vaddq_s16(q7s16, q1s16);
q11s16 = vaddq_s16(q5s16, q0s16);
q12s16 = vaddq_s16(q6s16, q2s16);
q15s16 = vaddq_s16(q4s16, q3s16);
// part of stage 6
LOAD_FROM_OUTPUT(28, 16, 17, q14s16, q13s16)
q8s16 = vaddq_s16(q14s16, q11s16);
q9s16 = vaddq_s16(q13s16, q10s16);
q13s16 = vsubq_s16(q13s16, q10s16);
q11s16 = vsubq_s16(q14s16, q11s16);
STORE_IN_OUTPUT(17, 17, 16, q9s16, q8s16)
LOAD_FROM_OUTPUT(16, 30, 31, q14s16, q9s16)
q8s16 = vsubq_s16(q9s16, q12s16);
q10s16 = vaddq_s16(q14s16, q15s16);
q14s16 = vsubq_s16(q14s16, q15s16);
q12s16 = vaddq_s16(q9s16, q12s16);
STORE_IN_OUTPUT(31, 30, 31, q10s16, q12s16)
// part of stage 7
DO_BUTTERFLY_STD(cospi_16_64, cospi_16_64, &q13s16, &q14s16)
STORE_IN_OUTPUT(31, 25, 22, q14s16, q13s16)
q13s16 = q11s16;
q14s16 = q8s16;
DO_BUTTERFLY_STD(cospi_16_64, cospi_16_64, &q13s16, &q14s16)
STORE_IN_OUTPUT(22, 24, 23, q14s16, q13s16)
// part of stage 4
q14s16 = vsubq_s16(q5s16, q0s16);
q13s16 = vsubq_s16(q6s16, q2s16);
DO_BUTTERFLY_STD(-cospi_8_64, -cospi_24_64, &q5s16, &q6s16);
q14s16 = vsubq_s16(q7s16, q1s16);
q13s16 = vsubq_s16(q4s16, q3s16);
DO_BUTTERFLY_STD(-cospi_8_64, -cospi_24_64, &q0s16, &q1s16);
// part of stage 6
LOAD_FROM_OUTPUT(23, 18, 19, q14s16, q13s16)
q8s16 = vaddq_s16(q14s16, q1s16);
q9s16 = vaddq_s16(q13s16, q6s16);
q13s16 = vsubq_s16(q13s16, q6s16);
q1s16 = vsubq_s16(q14s16, q1s16);
STORE_IN_OUTPUT(19, 18, 19, q8s16, q9s16)
LOAD_FROM_OUTPUT(19, 28, 29, q8s16, q9s16)
q14s16 = vsubq_s16(q8s16, q5s16);
q10s16 = vaddq_s16(q8s16, q5s16);
q11s16 = vaddq_s16(q9s16, q0s16);
q0s16 = vsubq_s16(q9s16, q0s16);
STORE_IN_OUTPUT(29, 28, 29, q10s16, q11s16)
// part of stage 7
DO_BUTTERFLY_STD(cospi_16_64, cospi_16_64, &q13s16, &q14s16)
STORE_IN_OUTPUT(29, 20, 27, q13s16, q14s16)
DO_BUTTERFLY(q0s16, q1s16, cospi_16_64, cospi_16_64, &q1s16, &q0s16);
STORE_IN_OUTPUT(27, 21, 26, q1s16, q0s16)
// -----------------------------------------
// BLOCK C: 8-10,11-15
// -----------------------------------------
// generate 8,9,14,15
// part of stage 2
LOAD_FROM_TRANSPOSED(3, 2, 30)
DO_BUTTERFLY_STD(cospi_30_64, cospi_2_64, &q0s16, &q2s16)
LOAD_FROM_TRANSPOSED(30, 18, 14)
DO_BUTTERFLY_STD(cospi_14_64, cospi_18_64, &q1s16, &q3s16)
// part of stage 3
q13s16 = vsubq_s16(q0s16, q1s16);
q0s16 = vaddq_s16(q0s16, q1s16);
q14s16 = vsubq_s16(q2s16, q3s16);
q2s16 = vaddq_s16(q2s16, q3s16);
// part of stage 4
DO_BUTTERFLY_STD(cospi_24_64, cospi_8_64, &q1s16, &q3s16)
// generate 10,11,12,13
// part of stage 2
LOAD_FROM_TRANSPOSED(14, 10, 22)
DO_BUTTERFLY_STD(cospi_22_64, cospi_10_64, &q5s16, &q7s16)
LOAD_FROM_TRANSPOSED(22, 26, 6)
DO_BUTTERFLY_STD(cospi_6_64, cospi_26_64, &q4s16, &q6s16)
// part of stage 3
q14s16 = vsubq_s16(q4s16, q5s16);
q5s16 = vaddq_s16(q4s16, q5s16);
q13s16 = vsubq_s16(q6s16, q7s16);
q6s16 = vaddq_s16(q6s16, q7s16);
// part of stage 4
DO_BUTTERFLY_STD(-cospi_8_64, -cospi_24_64, &q4s16, &q7s16)
// part of stage 5
q8s16 = vaddq_s16(q0s16, q5s16);
q9s16 = vaddq_s16(q1s16, q7s16);
q13s16 = vsubq_s16(q1s16, q7s16);
q14s16 = vsubq_s16(q3s16, q4s16);
q10s16 = vaddq_s16(q3s16, q4s16);
q15s16 = vaddq_s16(q2s16, q6s16);
STORE_IN_OUTPUT(26, 8, 15, q8s16, q15s16)
STORE_IN_OUTPUT(15, 9, 14, q9s16, q10s16)
// part of stage 6
DO_BUTTERFLY_STD(cospi_16_64, cospi_16_64, &q1s16, &q3s16)
STORE_IN_OUTPUT(14, 13, 10, q3s16, q1s16)
q13s16 = vsubq_s16(q0s16, q5s16);
q14s16 = vsubq_s16(q2s16, q6s16);
DO_BUTTERFLY_STD(cospi_16_64, cospi_16_64, &q1s16, &q3s16)
STORE_IN_OUTPUT(10, 11, 12, q1s16, q3s16)
// -----------------------------------------
// BLOCK D: 0-3,4-7
// -----------------------------------------
// generate 4,5,6,7
// part of stage 3
LOAD_FROM_TRANSPOSED(6, 4, 28)
DO_BUTTERFLY_STD(cospi_28_64, cospi_4_64, &q0s16, &q2s16)
LOAD_FROM_TRANSPOSED(28, 20, 12)
DO_BUTTERFLY_STD(cospi_12_64, cospi_20_64, &q1s16, &q3s16)
// part of stage 4
q13s16 = vsubq_s16(q0s16, q1s16);
q0s16 = vaddq_s16(q0s16, q1s16);
q14s16 = vsubq_s16(q2s16, q3s16);
q2s16 = vaddq_s16(q2s16, q3s16);
// part of stage 5
DO_BUTTERFLY_STD(cospi_16_64, cospi_16_64, &q1s16, &q3s16)
// generate 0,1,2,3
// part of stage 4
LOAD_FROM_TRANSPOSED(12, 0, 16)
DO_BUTTERFLY_STD(cospi_16_64, cospi_16_64, &q5s16, &q7s16)
LOAD_FROM_TRANSPOSED(16, 8, 24)
DO_BUTTERFLY_STD(cospi_24_64, cospi_8_64, &q14s16, &q6s16)
// part of stage 5
q4s16 = vaddq_s16(q7s16, q6s16);
q7s16 = vsubq_s16(q7s16, q6s16);
q6s16 = vsubq_s16(q5s16, q14s16);
q5s16 = vaddq_s16(q5s16, q14s16);
// part of stage 6
q8s16 = vaddq_s16(q4s16, q2s16);
q9s16 = vaddq_s16(q5s16, q3s16);
q10s16 = vaddq_s16(q6s16, q1s16);
q11s16 = vaddq_s16(q7s16, q0s16);
q12s16 = vsubq_s16(q7s16, q0s16);
q13s16 = vsubq_s16(q6s16, q1s16);
q14s16 = vsubq_s16(q5s16, q3s16);
q15s16 = vsubq_s16(q4s16, q2s16);
// part of stage 7
LOAD_FROM_OUTPUT(12, 14, 15, q0s16, q1s16)
q2s16 = vaddq_s16(q8s16, q1s16);
q3s16 = vaddq_s16(q9s16, q0s16);
q4s16 = vsubq_s16(q9s16, q0s16);
q5s16 = vsubq_s16(q8s16, q1s16);
LOAD_FROM_OUTPUT(15, 16, 17, q0s16, q1s16)
q8s16 = vaddq_s16(q4s16, q1s16);
q9s16 = vaddq_s16(q5s16, q0s16);
q6s16 = vsubq_s16(q5s16, q0s16);
q7s16 = vsubq_s16(q4s16, q1s16);
if (idct32_pass_loop == 0) {
idct32_bands_end_1st_pass(out, q2s16, q3s16, q6s16, q7s16, q8s16, q9s16,
q10s16, q11s16, q12s16, q13s16, q14s16,
q15s16);
} else {
idct32_bands_end_2nd_pass(out, dest, stride, q2s16, q3s16, q6s16, q7s16,
q8s16, q9s16, q10s16, q11s16, q12s16, q13s16,
q14s16, q15s16);
dest += 8;
}
}
}
}