ref: 182ea677a00c9206ce418c20f9ab18d8fd87fff2
dir: /vpx_dsp/arm/highbd_idct4x4_add_neon.c/
/*
* Copyright (c) 2016 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_dsp_rtcd.h"
#include "vpx_dsp/arm/idct_neon.h"
#include "vpx_dsp/inv_txfm.h"
static INLINE void highbd_idct4x4_1_add_kernel1(uint16_t **dest,
const int stride,
const int16x8_t res,
const int16x8_t max) {
const uint16x4_t a0 = vld1_u16(*dest);
const uint16x4_t a1 = vld1_u16(*dest + stride);
const int16x8_t a = vreinterpretq_s16_u16(vcombine_u16(a0, a1));
// Note: In some profile tests, res is quite close to +/-32767.
// We use saturating addition.
const int16x8_t b = vqaddq_s16(res, a);
const int16x8_t c = vminq_s16(b, max);
const uint16x8_t d = vqshluq_n_s16(c, 0);
vst1_u16(*dest, vget_low_u16(d));
*dest += stride;
vst1_u16(*dest, vget_high_u16(d));
*dest += stride;
}
// res is in reverse row order
static INLINE void highbd_idct4x4_1_add_kernel2(uint16_t **dest,
const int stride,
const int16x8_t res,
const int16x8_t max) {
const uint16x4_t a0 = vld1_u16(*dest);
const uint16x4_t a1 = vld1_u16(*dest + stride);
const int16x8_t a = vreinterpretq_s16_u16(vcombine_u16(a1, a0));
// Note: In some profile tests, res is quite close to +/-32767.
// We use saturating addition.
const int16x8_t b = vqaddq_s16(res, a);
const int16x8_t c = vminq_s16(b, max);
const uint16x8_t d = vqshluq_n_s16(c, 0);
vst1_u16(*dest, vget_high_u16(d));
*dest += stride;
vst1_u16(*dest, vget_low_u16(d));
*dest += stride;
}
void vpx_highbd_idct4x4_1_add_neon(const tran_low_t *input, uint8_t *dest8,
int stride, int bd) {
const int16x8_t max = vdupq_n_s16((1 << bd) - 1);
const tran_low_t out0 =
HIGHBD_WRAPLOW(dct_const_round_shift(input[0] * cospi_16_64), bd);
const tran_low_t out1 =
HIGHBD_WRAPLOW(dct_const_round_shift(out0 * cospi_16_64), bd);
const int16_t a1 = ROUND_POWER_OF_TWO(out1, 4);
const int16x8_t dc = vdupq_n_s16(a1);
uint16_t *dest = CONVERT_TO_SHORTPTR(dest8);
highbd_idct4x4_1_add_kernel1(&dest, stride, dc, max);
highbd_idct4x4_1_add_kernel1(&dest, stride, dc, max);
}
static INLINE void idct4x4_16_kernel_bd10(const int32x4_t cospis,
int32x4_t *const a0,
int32x4_t *const a1,
int32x4_t *const a2,
int32x4_t *const a3) {
int32x4_t b0, b1, b2, b3;
transpose_s32_4x4(a0, a1, a2, a3);
b0 = vaddq_s32(*a0, *a2);
b1 = vsubq_s32(*a0, *a2);
b0 = vmulq_lane_s32(b0, vget_high_s32(cospis), 0);
b1 = vmulq_lane_s32(b1, vget_high_s32(cospis), 0);
b2 = vmulq_lane_s32(*a1, vget_high_s32(cospis), 1);
b3 = vmulq_lane_s32(*a1, vget_low_s32(cospis), 1);
b2 = vmlsq_lane_s32(b2, *a3, vget_low_s32(cospis), 1);
b3 = vmlaq_lane_s32(b3, *a3, vget_high_s32(cospis), 1);
b0 = vrshrq_n_s32(b0, 14);
b1 = vrshrq_n_s32(b1, 14);
b2 = vrshrq_n_s32(b2, 14);
b3 = vrshrq_n_s32(b3, 14);
*a0 = vaddq_s32(b0, b3);
*a1 = vaddq_s32(b1, b2);
*a2 = vsubq_s32(b1, b2);
*a3 = vsubq_s32(b0, b3);
}
static INLINE void idct4x4_16_kernel_bd12(const int32x4_t cospis,
int32x4_t *const a0,
int32x4_t *const a1,
int32x4_t *const a2,
int32x4_t *const a3) {
int32x4_t b0, b1, b2, b3;
int64x2_t c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11;
transpose_s32_4x4(a0, a1, a2, a3);
b0 = vaddq_s32(*a0, *a2);
b1 = vsubq_s32(*a0, *a2);
c0 = vmull_lane_s32(vget_low_s32(b0), vget_high_s32(cospis), 0);
c1 = vmull_lane_s32(vget_high_s32(b0), vget_high_s32(cospis), 0);
c2 = vmull_lane_s32(vget_low_s32(b1), vget_high_s32(cospis), 0);
c3 = vmull_lane_s32(vget_high_s32(b1), vget_high_s32(cospis), 0);
c4 = vmull_lane_s32(vget_low_s32(*a1), vget_high_s32(cospis), 1);
c5 = vmull_lane_s32(vget_high_s32(*a1), vget_high_s32(cospis), 1);
c6 = vmull_lane_s32(vget_low_s32(*a1), vget_low_s32(cospis), 1);
c7 = vmull_lane_s32(vget_high_s32(*a1), vget_low_s32(cospis), 1);
c8 = vmull_lane_s32(vget_low_s32(*a3), vget_low_s32(cospis), 1);
c9 = vmull_lane_s32(vget_high_s32(*a3), vget_low_s32(cospis), 1);
c10 = vmull_lane_s32(vget_low_s32(*a3), vget_high_s32(cospis), 1);
c11 = vmull_lane_s32(vget_high_s32(*a3), vget_high_s32(cospis), 1);
c4 = vsubq_s64(c4, c8);
c5 = vsubq_s64(c5, c9);
c6 = vaddq_s64(c6, c10);
c7 = vaddq_s64(c7, c11);
b0 = vcombine_s32(vrshrn_n_s64(c0, 14), vrshrn_n_s64(c1, 14));
b1 = vcombine_s32(vrshrn_n_s64(c2, 14), vrshrn_n_s64(c3, 14));
b2 = vcombine_s32(vrshrn_n_s64(c4, 14), vrshrn_n_s64(c5, 14));
b3 = vcombine_s32(vrshrn_n_s64(c6, 14), vrshrn_n_s64(c7, 14));
*a0 = vaddq_s32(b0, b3);
*a1 = vaddq_s32(b1, b2);
*a2 = vsubq_s32(b1, b2);
*a3 = vsubq_s32(b0, b3);
}
void vpx_highbd_idct4x4_16_add_neon(const tran_low_t *input, uint8_t *dest8,
int stride, int bd) {
const int16x8_t max = vdupq_n_s16((1 << bd) - 1);
int32x4_t c0 = vld1q_s32(input);
int32x4_t c1 = vld1q_s32(input + 4);
int32x4_t c2 = vld1q_s32(input + 8);
int32x4_t c3 = vld1q_s32(input + 12);
uint16_t *dest = CONVERT_TO_SHORTPTR(dest8);
int16x8_t a0, a1;
if (bd == 8) {
const int16x4_t cospis = vld1_s16(kCospi);
// Rows
a0 = vcombine_s16(vmovn_s32(c0), vmovn_s32(c1));
a1 = vcombine_s16(vmovn_s32(c2), vmovn_s32(c3));
idct4x4_16_kernel_bd8(cospis, &a0, &a1);
// Columns
a1 = vcombine_s16(vget_high_s16(a1), vget_low_s16(a1));
idct4x4_16_kernel_bd8(cospis, &a0, &a1);
a0 = vrshrq_n_s16(a0, 4);
a1 = vrshrq_n_s16(a1, 4);
} else {
const int32x4_t cospis = vld1q_s32(kCospi32);
if (bd == 10) {
idct4x4_16_kernel_bd10(cospis, &c0, &c1, &c2, &c3);
idct4x4_16_kernel_bd10(cospis, &c0, &c1, &c2, &c3);
} else {
idct4x4_16_kernel_bd12(cospis, &c0, &c1, &c2, &c3);
idct4x4_16_kernel_bd12(cospis, &c0, &c1, &c2, &c3);
}
a0 = vcombine_s16(vqrshrn_n_s32(c0, 4), vqrshrn_n_s32(c1, 4));
a1 = vcombine_s16(vqrshrn_n_s32(c3, 4), vqrshrn_n_s32(c2, 4));
}
highbd_idct4x4_1_add_kernel1(&dest, stride, a0, max);
highbd_idct4x4_1_add_kernel2(&dest, stride, a1, max);
}