ref: e8b818b581b9ab7e9c8f7b1becd753dd4efbdf43
dir: /vp9/common/arm/neon/vp9_iht_neon.h/
/*
* Copyright (c) 2018 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_VP9_COMMON_ARM_NEON_VP9_IHT_NEON_H_
#define VPX_VP9_COMMON_ARM_NEON_VP9_IHT_NEON_H_
#include <arm_neon.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/txfm_common.h"
static INLINE void iadst4(int16x8_t *const io) {
const int32x4_t c3 = vdupq_n_s32(sinpi_3_9);
int16x4_t x[4];
int32x4_t s[8], output[4];
const int16x4_t c =
create_s16x4_neon(sinpi_1_9, sinpi_2_9, sinpi_3_9, sinpi_4_9);
x[0] = vget_low_s16(io[0]);
x[1] = vget_low_s16(io[1]);
x[2] = vget_high_s16(io[0]);
x[3] = vget_high_s16(io[1]);
s[0] = vmull_lane_s16(x[0], c, 0);
s[1] = vmull_lane_s16(x[0], c, 1);
s[2] = vmull_lane_s16(x[1], c, 2);
s[3] = vmull_lane_s16(x[2], c, 3);
s[4] = vmull_lane_s16(x[2], c, 0);
s[5] = vmull_lane_s16(x[3], c, 1);
s[6] = vmull_lane_s16(x[3], c, 3);
s[7] = vaddl_s16(x[0], x[3]);
s[7] = vsubw_s16(s[7], x[2]);
s[0] = vaddq_s32(s[0], s[3]);
s[0] = vaddq_s32(s[0], s[5]);
s[1] = vsubq_s32(s[1], s[4]);
s[1] = vsubq_s32(s[1], s[6]);
s[3] = s[2];
s[2] = vmulq_s32(c3, s[7]);
output[0] = vaddq_s32(s[0], s[3]);
output[1] = vaddq_s32(s[1], s[3]);
output[2] = s[2];
output[3] = vaddq_s32(s[0], s[1]);
output[3] = vsubq_s32(output[3], s[3]);
dct_const_round_shift_low_8_dual(output, &io[0], &io[1]);
}
static INLINE void iadst_half_butterfly_neon(int16x8_t *const x,
const int16x4_t c) {
// Don't add/sub before multiply, which will overflow in iadst8.
const int32x4_t x0_lo = vmull_lane_s16(vget_low_s16(x[0]), c, 0);
const int32x4_t x0_hi = vmull_lane_s16(vget_high_s16(x[0]), c, 0);
const int32x4_t x1_lo = vmull_lane_s16(vget_low_s16(x[1]), c, 0);
const int32x4_t x1_hi = vmull_lane_s16(vget_high_s16(x[1]), c, 0);
int32x4_t t0[2], t1[2];
t0[0] = vaddq_s32(x0_lo, x1_lo);
t0[1] = vaddq_s32(x0_hi, x1_hi);
t1[0] = vsubq_s32(x0_lo, x1_lo);
t1[1] = vsubq_s32(x0_hi, x1_hi);
x[0] = dct_const_round_shift_low_8(t0);
x[1] = dct_const_round_shift_low_8(t1);
}
static INLINE void iadst_half_butterfly_neg_neon(int16x8_t *const x0,
int16x8_t *const x1,
const int16x4_t c) {
// Don't add/sub before multiply, which will overflow in iadst8.
const int32x4_t x0_lo = vmull_lane_s16(vget_low_s16(*x0), c, 1);
const int32x4_t x0_hi = vmull_lane_s16(vget_high_s16(*x0), c, 1);
const int32x4_t x1_lo = vmull_lane_s16(vget_low_s16(*x1), c, 1);
const int32x4_t x1_hi = vmull_lane_s16(vget_high_s16(*x1), c, 1);
int32x4_t t0[2], t1[2];
t0[0] = vaddq_s32(x0_lo, x1_lo);
t0[1] = vaddq_s32(x0_hi, x1_hi);
t1[0] = vsubq_s32(x0_lo, x1_lo);
t1[1] = vsubq_s32(x0_hi, x1_hi);
*x1 = dct_const_round_shift_low_8(t0);
*x0 = dct_const_round_shift_low_8(t1);
}
static INLINE void iadst_half_butterfly_pos_neon(int16x8_t *const x0,
int16x8_t *const x1,
const int16x4_t c) {
// Don't add/sub before multiply, which will overflow in iadst8.
const int32x4_t x0_lo = vmull_lane_s16(vget_low_s16(*x0), c, 0);
const int32x4_t x0_hi = vmull_lane_s16(vget_high_s16(*x0), c, 0);
const int32x4_t x1_lo = vmull_lane_s16(vget_low_s16(*x1), c, 0);
const int32x4_t x1_hi = vmull_lane_s16(vget_high_s16(*x1), c, 0);
int32x4_t t0[2], t1[2];
t0[0] = vaddq_s32(x0_lo, x1_lo);
t0[1] = vaddq_s32(x0_hi, x1_hi);
t1[0] = vsubq_s32(x0_lo, x1_lo);
t1[1] = vsubq_s32(x0_hi, x1_hi);
*x1 = dct_const_round_shift_low_8(t0);
*x0 = dct_const_round_shift_low_8(t1);
}
static INLINE void iadst_butterfly_lane_0_1_neon(const int16x8_t in0,
const int16x8_t in1,
const int16x4_t c,
int32x4_t *const s0,
int32x4_t *const s1) {
s0[0] = vmull_lane_s16(vget_low_s16(in0), c, 0);
s0[1] = vmull_lane_s16(vget_high_s16(in0), c, 0);
s1[0] = vmull_lane_s16(vget_low_s16(in0), c, 1);
s1[1] = vmull_lane_s16(vget_high_s16(in0), c, 1);
s0[0] = vmlal_lane_s16(s0[0], vget_low_s16(in1), c, 1);
s0[1] = vmlal_lane_s16(s0[1], vget_high_s16(in1), c, 1);
s1[0] = vmlsl_lane_s16(s1[0], vget_low_s16(in1), c, 0);
s1[1] = vmlsl_lane_s16(s1[1], vget_high_s16(in1), c, 0);
}
static INLINE void iadst_butterfly_lane_2_3_neon(const int16x8_t in0,
const int16x8_t in1,
const int16x4_t c,
int32x4_t *const s0,
int32x4_t *const s1) {
s0[0] = vmull_lane_s16(vget_low_s16(in0), c, 2);
s0[1] = vmull_lane_s16(vget_high_s16(in0), c, 2);
s1[0] = vmull_lane_s16(vget_low_s16(in0), c, 3);
s1[1] = vmull_lane_s16(vget_high_s16(in0), c, 3);
s0[0] = vmlal_lane_s16(s0[0], vget_low_s16(in1), c, 3);
s0[1] = vmlal_lane_s16(s0[1], vget_high_s16(in1), c, 3);
s1[0] = vmlsl_lane_s16(s1[0], vget_low_s16(in1), c, 2);
s1[1] = vmlsl_lane_s16(s1[1], vget_high_s16(in1), c, 2);
}
static INLINE void iadst_butterfly_lane_1_0_neon(const int16x8_t in0,
const int16x8_t in1,
const int16x4_t c,
int32x4_t *const s0,
int32x4_t *const s1) {
s0[0] = vmull_lane_s16(vget_low_s16(in0), c, 1);
s0[1] = vmull_lane_s16(vget_high_s16(in0), c, 1);
s1[0] = vmull_lane_s16(vget_low_s16(in0), c, 0);
s1[1] = vmull_lane_s16(vget_high_s16(in0), c, 0);
s0[0] = vmlal_lane_s16(s0[0], vget_low_s16(in1), c, 0);
s0[1] = vmlal_lane_s16(s0[1], vget_high_s16(in1), c, 0);
s1[0] = vmlsl_lane_s16(s1[0], vget_low_s16(in1), c, 1);
s1[1] = vmlsl_lane_s16(s1[1], vget_high_s16(in1), c, 1);
}
static INLINE void iadst_butterfly_lane_3_2_neon(const int16x8_t in0,
const int16x8_t in1,
const int16x4_t c,
int32x4_t *const s0,
int32x4_t *const s1) {
s0[0] = vmull_lane_s16(vget_low_s16(in0), c, 3);
s0[1] = vmull_lane_s16(vget_high_s16(in0), c, 3);
s1[0] = vmull_lane_s16(vget_low_s16(in0), c, 2);
s1[1] = vmull_lane_s16(vget_high_s16(in0), c, 2);
s0[0] = vmlal_lane_s16(s0[0], vget_low_s16(in1), c, 2);
s0[1] = vmlal_lane_s16(s0[1], vget_high_s16(in1), c, 2);
s1[0] = vmlsl_lane_s16(s1[0], vget_low_s16(in1), c, 3);
s1[1] = vmlsl_lane_s16(s1[1], vget_high_s16(in1), c, 3);
}
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) {
const int16x4_t c0 =
create_s16x4_neon(cospi_2_64, cospi_30_64, cospi_10_64, cospi_22_64);
const int16x4_t c1 =
create_s16x4_neon(cospi_18_64, cospi_14_64, cospi_26_64, cospi_6_64);
const int16x4_t c2 =
create_s16x4_neon(cospi_16_64, 0, cospi_8_64, cospi_24_64);
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_lane_0_1_neon(x[0], x[1], c0, s0, s1);
iadst_butterfly_lane_2_3_neon(x[2], x[3], c0, s2, s3);
iadst_butterfly_lane_0_1_neon(x[4], x[5], c1, s4, s5);
iadst_butterfly_lane_2_3_neon(x[6], x[7], c1, 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_lane_2_3_neon(x[4], x[5], c2, s4, s5);
iadst_butterfly_lane_3_2_neon(x[7], x[6], c2, 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, c2);
iadst_half_butterfly_neon(x + 6, c2);
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 vpx_iadst16x16_256_add_half1d(const void *const input, int16_t *output,
void *const dest, const int stride,
const int highbd_flag);
typedef void (*iht_1d)(const void *const input, int16_t *output,
void *const dest, const int stride,
const int highbd_flag);
typedef struct {
iht_1d cols, rows; // vertical and horizontal
} iht_2d;
#endif // VPX_VP9_COMMON_ARM_NEON_VP9_IHT_NEON_H_