/*
* Copyright (c) 2022 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.
*/
#ifndef VPX_VPX_DSP_ARM_FDCT8X8_NEON_H_
#define VPX_VPX_DSP_ARM_FDCT8X8_NEON_H_
#include <arm_neon.h>
static INLINE void vpx_fdct8x8_pass1_notranspose_neon(int16x8_t *in,
int16x8_t *out) {
int16x8_t s[8], x[4], t[2];
s[0] = vaddq_s16(in[0], in[7]);
s[1] = vaddq_s16(in[1], in[6]);
s[2] = vaddq_s16(in[2], in[5]);
s[3] = vaddq_s16(in[3], in[4]);
s[4] = vsubq_s16(in[3], in[4]);
s[5] = vsubq_s16(in[2], in[5]);
s[6] = vsubq_s16(in[1], in[6]);
s[7] = vsubq_s16(in[0], in[7]);
// fdct4(step, step);
x[0] = vaddq_s16(s[0], s[3]);
x[1] = vaddq_s16(s[1], s[2]);
x[2] = vsubq_s16(s[1], s[2]);
x[3] = vsubq_s16(s[0], s[3]);
// fdct4(step, step);
// out[0] = (tran_low_t)fdct_round_shift((x0 + x1) * cospi_16_64)
// out[4] = (tran_low_t)fdct_round_shift((x0 - x1) * cospi_16_64)
butterfly_one_coeff_s16_fast(x[0], x[1], cospi_16_64, &out[0], &out[4]);
// out[2] = (tran_low_t)fdct_round_shift(x2 * cospi_24_64 + x3 * cospi_8_64)
// out[6] = (tran_low_t)fdct_round_shift(-x2 * cospi_8_64 + x3 * cospi_24_64)
butterfly_two_coeff(x[3], x[2], cospi_8_64, cospi_24_64, &out[2], &out[6]);
// Stage 2
// t0 = (s6 - s5) * cospi_16_64;
// t1 = (s6 + s5) * cospi_16_64;
butterfly_one_coeff_s16_fast(s[6], s[5], cospi_16_64, &t[1], &t[0]);
// Stage 3
x[0] = vaddq_s16(s[4], t[0]);
x[1] = vsubq_s16(s[4], t[0]);
x[2] = vsubq_s16(s[7], t[1]);
x[3] = vaddq_s16(s[7], t[1]);
// Stage 4
// out[1] = (tran_low_t)fdct_round_shift(x0 * cospi_28_64 + x3 * cospi_4_64)
// out[7] = (tran_low_t)fdct_round_shift(x3 * cospi_28_64 + x0 * -cospi_4_64)
butterfly_two_coeff(x[3], x[0], cospi_4_64, cospi_28_64, &out[1], &out[7]);
// out[5] = (tran_low_t)fdct_round_shift(x1 * cospi_12_64 + x2 * cospi_20_64)
// out[3] = (tran_low_t)fdct_round_shift(x2 * cospi_12_64 + x1 * -cospi_20_64)
butterfly_two_coeff(x[2], x[1], cospi_20_64, cospi_12_64, &out[5], &out[3]);
}
static INLINE void vpx_fdct8x8_pass2_notranspose_neon(int16x8_t *in,
int16x8_t *out) {
int16x8_t s[8], x[4], t[2];
s[0] = vaddq_s16(in[0], in[7]);
s[1] = vaddq_s16(in[1], in[6]);
s[2] = vaddq_s16(in[2], in[5]);
s[3] = vaddq_s16(in[3], in[4]);
s[4] = vsubq_s16(in[3], in[4]);
s[5] = vsubq_s16(in[2], in[5]);
s[6] = vsubq_s16(in[1], in[6]);
s[7] = vsubq_s16(in[0], in[7]);
// fdct4(step, step);
x[0] = vaddq_s16(s[0], s[3]);
x[1] = vaddq_s16(s[1], s[2]);
x[2] = vsubq_s16(s[1], s[2]);
x[3] = vsubq_s16(s[0], s[3]);
// fdct4(step, step);
// out[0] = (tran_low_t)fdct_round_shift((x0 + x1) * cospi_16_64)
// out[4] = (tran_low_t)fdct_round_shift((x0 - x1) * cospi_16_64)
butterfly_one_coeff_s16_s32_fast_narrow(x[0], x[1], cospi_16_64, &out[0],
&out[4]);
// out[2] = (tran_low_t)fdct_round_shift(x2 * cospi_24_64 + x3 * cospi_8_64)
// out[6] = (tran_low_t)fdct_round_shift(-x2 * cospi_8_64 + x3 * cospi_24_64)
butterfly_two_coeff(x[3], x[2], cospi_8_64, cospi_24_64, &out[2], &out[6]);
// Stage 2
// t0 = (s6 - s5) * cospi_16_64;
// t1 = (s6 + s5) * cospi_16_64;
butterfly_one_coeff_s16_s32_fast_narrow(s[6], s[5], cospi_16_64, &t[1],
&t[0]);
// Stage 3
x[0] = vaddq_s16(s[4], t[0]);
x[1] = vsubq_s16(s[4], t[0]);
x[2] = vsubq_s16(s[7], t[1]);
x[3] = vaddq_s16(s[7], t[1]);
// Stage 4
// out[1] = (tran_low_t)fdct_round_shift(x0 * cospi_28_64 + x3 * cospi_4_64)
// out[7] = (tran_low_t)fdct_round_shift(x3 * cospi_28_64 + x0 * -cospi_4_64)
butterfly_two_coeff(x[3], x[0], cospi_4_64, cospi_28_64, &out[1], &out[7]);
// out[5] = (tran_low_t)fdct_round_shift(x1 * cospi_12_64 + x2 * cospi_20_64)
// out[3] = (tran_low_t)fdct_round_shift(x2 * cospi_12_64 + x1 * -cospi_20_64)
butterfly_two_coeff(x[2], x[1], cospi_20_64, cospi_12_64, &out[5], &out[3]);
}
static INLINE void vpx_fdct8x8_pass1_neon(int16x8_t *in) {
int16x8_t out[8];
vpx_fdct8x8_pass1_notranspose_neon(in, out);
// transpose 8x8
transpose_s16_8x8(&out[0], &out[1], &out[2], &out[3], &out[4], &out[5],
&out[6], &out[7]);
in[0] = out[0];
in[1] = out[1];
in[2] = out[2];
in[3] = out[3];
in[4] = out[4];
in[5] = out[5];
in[6] = out[6];
in[7] = out[7];
}
static INLINE void vpx_fdct8x8_pass2_neon(int16x8_t *in) {
int16x8_t out[8];
vpx_fdct8x8_pass2_notranspose_neon(in, out);
// transpose 8x8
transpose_s16_8x8(&out[0], &out[1], &out[2], &out[3], &out[4], &out[5],
&out[6], &out[7]);
in[0] = out[0];
in[1] = out[1];
in[2] = out[2];
in[3] = out[3];
in[4] = out[4];
in[5] = out[5];
in[6] = out[6];
in[7] = out[7];
}
#if CONFIG_VP9_HIGHBITDEPTH
static INLINE void vpx_highbd_fdct8x8_pass1_notranspose_neon(int32x4_t *left,
int32x4_t *right) {
int32x4_t sl[8], sr[8], xl[4], xr[4], tl[4], tr[4];
sl[0] = vaddq_s32(left[0], left[7]);
sl[1] = vaddq_s32(left[1], left[6]);
sl[2] = vaddq_s32(left[2], left[5]);
sl[3] = vaddq_s32(left[3], left[4]);
sl[4] = vsubq_s32(left[3], left[4]);
sl[5] = vsubq_s32(left[2], left[5]);
sl[6] = vsubq_s32(left[1], left[6]);
sl[7] = vsubq_s32(left[0], left[7]);
sr[0] = vaddq_s32(right[0], right[7]);
sr[1] = vaddq_s32(right[1], right[6]);
sr[2] = vaddq_s32(right[2], right[5]);
sr[3] = vaddq_s32(right[3], right[4]);
sr[4] = vsubq_s32(right[3], right[4]);
sr[5] = vsubq_s32(right[2], right[5]);
sr[6] = vsubq_s32(right[1], right[6]);
sr[7] = vsubq_s32(right[0], right[7]);
// fdct4(step, step);
// x0 = s0 + s3;
xl[0] = vaddq_s32(sl[0], sl[3]);
xr[0] = vaddq_s32(sr[0], sr[3]);
// x1 = s1 + s2;
xl[1] = vaddq_s32(sl[1], sl[2]);
xr[1] = vaddq_s32(sr[1], sr[2]);
// x2 = s1 - s2;
xl[2] = vsubq_s32(sl[1], sl[2]);
xr[2] = vsubq_s32(sr[1], sr[2]);
// x3 = s0 - s3;
xl[3] = vsubq_s32(sl[0], sl[3]);
xr[3] = vsubq_s32(sr[0], sr[3]);
// fdct4(step, step);
// out[0] = (tran_low_t)fdct_round_shift((x0 + x1) * cospi_16_64)
// out[4] = (tran_low_t)fdct_round_shift((x0 - x1) * cospi_16_64)
butterfly_one_coeff_s32_fast(xl[0], xr[0], xl[1], xr[1], cospi_16_64,
&left[0], &right[0], &left[4], &right[4]);
// out[2] = (tran_low_t)fdct_round_shift(x2 * cospi_24_64 + x3 * cospi_8_64)
// out[6] = (tran_low_t)fdct_round_shift(-x2 * cospi_8_64 + x3 * cospi_24_64)
butterfly_two_coeff_s32(xl[3], xr[3], xl[2], xr[2], cospi_8_64, cospi_24_64,
&left[2], &right[2], &left[6], &right[6]);
// Stage 2
// t0 = (s6 - s5) * cospi_16_64;
// t1 = (s6 + s5) * cospi_16_64;
butterfly_one_coeff_s32_fast(sl[6], sr[6], sl[5], sr[5], cospi_16_64, &tl[1],
&tr[1], &tl[0], &tr[0]);
// Stage 3
xl[0] = vaddq_s32(sl[4], tl[0]);
xr[0] = vaddq_s32(sr[4], tr[0]);
xl[1] = vsubq_s32(sl[4], tl[0]);
xr[1] = vsubq_s32(sr[4], tr[0]);
xl[2] = vsubq_s32(sl[7], tl[1]);
xr[2] = vsubq_s32(sr[7], tr[1]);
xl[3] = vaddq_s32(sl[7], tl[1]);
xr[3] = vaddq_s32(sr[7], tr[1]);
// Stage 4
// out[1] = (tran_low_t)fdct_round_shift(x0 * cospi_28_64 + x3 * cospi_4_64)
// out[7] = (tran_low_t)fdct_round_shift(x3 * cospi_28_64 + x0 * -cospi_4_64)
butterfly_two_coeff_s32(xl[3], xr[3], xl[0], xr[0], cospi_4_64, cospi_28_64,
&left[1], &right[1], &left[7], &right[7]);
// out[5] = (tran_low_t)fdct_round_shift(x1 * cospi_12_64 + x2 * cospi_20_64)
// out[3] = (tran_low_t)fdct_round_shift(x2 * cospi_12_64 + x1 * -cospi_20_64)
butterfly_two_coeff_s32(xl[2], xr[2], xl[1], xr[1], cospi_20_64, cospi_12_64,
&left[5], &right[5], &left[3], &right[3]);
}
static INLINE void vpx_highbd_fdct8x8_pass2_notranspose_neon(int32x4_t *left,
int32x4_t *right) {
int32x4_t sl[8], sr[8], xl[4], xr[4], tl[4], tr[4];
sl[0] = vaddq_s32(left[0], left[7]);
sl[1] = vaddq_s32(left[1], left[6]);
sl[2] = vaddq_s32(left[2], left[5]);
sl[3] = vaddq_s32(left[3], left[4]);
sl[4] = vsubq_s32(left[3], left[4]);
sl[5] = vsubq_s32(left[2], left[5]);
sl[6] = vsubq_s32(left[1], left[6]);
sl[7] = vsubq_s32(left[0], left[7]);
sr[0] = vaddq_s32(right[0], right[7]);
sr[1] = vaddq_s32(right[1], right[6]);
sr[2] = vaddq_s32(right[2], right[5]);
sr[3] = vaddq_s32(right[3], right[4]);
sr[4] = vsubq_s32(right[3], right[4]);
sr[5] = vsubq_s32(right[2], right[5]);
sr[6] = vsubq_s32(right[1], right[6]);
sr[7] = vsubq_s32(right[0], right[7]);
// fdct4(step, step);
// x0 = s0 + s3;
xl[0] = vaddq_s32(sl[0], sl[3]);
xr[0] = vaddq_s32(sr[0], sr[3]);
// x1 = s1 + s2;
xl[1] = vaddq_s32(sl[1], sl[2]);
xr[1] = vaddq_s32(sr[1], sr[2]);
// x2 = s1 - s2;
xl[2] = vsubq_s32(sl[1], sl[2]);
xr[2] = vsubq_s32(sr[1], sr[2]);
// x3 = s0 - s3;
xl[3] = vsubq_s32(sl[0], sl[3]);
xr[3] = vsubq_s32(sr[0], sr[3]);
// fdct4(step, step);
// out[0] = (tran_low_t)fdct_round_shift((x0 + x1) * cospi_16_64)
// out[4] = (tran_low_t)fdct_round_shift((x0 - x1) * cospi_16_64)
butterfly_one_coeff_s32_fast(xl[0], xr[0], xl[1], xr[1], cospi_16_64,
&left[0], &right[0], &left[4], &right[4]);
// out[2] = (tran_low_t)fdct_round_shift(x2 * cospi_24_64 + x3 * cospi_8_64)
// out[6] = (tran_low_t)fdct_round_shift(-x2 * cospi_8_64 + x3 * cospi_24_64)
butterfly_two_coeff_s32_s64_narrow(xl[3], xr[3], xl[2], xr[2], cospi_8_64,
cospi_24_64, &left[2], &right[2], &left[6],
&right[6]);
// Stage 2
// t0 = (s6 - s5) * cospi_16_64;
// t1 = (s6 + s5) * cospi_16_64;
butterfly_one_coeff_s32_fast(sl[6], sr[6], sl[5], sr[5], cospi_16_64, &tl[1],
&tr[1], &tl[0], &tr[0]);
// Stage 3
xl[0] = vaddq_s32(sl[4], tl[0]);
xr[0] = vaddq_s32(sr[4], tr[0]);
xl[1] = vsubq_s32(sl[4], tl[0]);
xr[1] = vsubq_s32(sr[4], tr[0]);
xl[2] = vsubq_s32(sl[7], tl[1]);
xr[2] = vsubq_s32(sr[7], tr[1]);
xl[3] = vaddq_s32(sl[7], tl[1]);
xr[3] = vaddq_s32(sr[7], tr[1]);
// Stage 4
// out[1] = (tran_low_t)fdct_round_shift(x0 * cospi_28_64 + x3 * cospi_4_64)
// out[7] = (tran_low_t)fdct_round_shift(x3 * cospi_28_64 + x0 * -cospi_4_64)
butterfly_two_coeff_s32_s64_narrow(xl[3], xr[3], xl[0], xr[0], cospi_4_64,
cospi_28_64, &left[1], &right[1], &left[7],
&right[7]);
// out[5] = (tran_low_t)fdct_round_shift(x1 * cospi_12_64 + x2 * cospi_20_64)
// out[3] = (tran_low_t)fdct_round_shift(x2 * cospi_12_64 + x1 * -cospi_20_64)
butterfly_two_coeff_s32_s64_narrow(xl[2], xr[2], xl[1], xr[1], cospi_20_64,
cospi_12_64, &left[5], &right[5], &left[3],
&right[3]);
}
static INLINE void vpx_highbd_fdct8x8_pass1_neon(int32x4_t *left,
int32x4_t *right) {
vpx_highbd_fdct8x8_pass1_notranspose_neon(left, right);
transpose_s32_8x8_2(left, right, left, right);
}
static INLINE void vpx_highbd_fdct8x8_pass2_neon(int32x4_t *left,
int32x4_t *right) {
vpx_highbd_fdct8x8_pass2_notranspose_neon(left, right);
transpose_s32_8x8_2(left, right, left, right);
}
#endif // CONFIG_VP9_HIGHBITDEPTH
#endif // VPX_VPX_DSP_ARM_FDCT8X8_NEON_H_
