ref: de3a7e26303c884e9b4ee8f2c1c855a717d57b17
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, uint16_t *dest,
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] * (tran_high_t)cospi_16_64), bd);
const tran_low_t out1 = HIGHBD_WRAPLOW(
dct_const_round_shift(out0 * (tran_high_t)cospi_16_64), bd);
const int16_t a1 = ROUND_POWER_OF_TWO(out1, 4);
const int16x8_t dc = vdupq_n_s16(a1);
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 a) {
int32x4_t b0, b1, b2, b3;
transpose_s32_4x4(&a[0], &a[1], &a[2], &a[3]);
b0 = vaddq_s32(a[0], a[2]);
b1 = vsubq_s32(a[0], a[2]);
b0 = vmulq_lane_s32(b0, vget_high_s32(cospis), 0);
b1 = vmulq_lane_s32(b1, vget_high_s32(cospis), 0);
b2 = vmulq_lane_s32(a[1], vget_high_s32(cospis), 1);
b3 = vmulq_lane_s32(a[1], vget_low_s32(cospis), 1);
b2 = vmlsq_lane_s32(b2, a[3], vget_low_s32(cospis), 1);
b3 = vmlaq_lane_s32(b3, a[3], vget_high_s32(cospis), 1);
b0 = vrshrq_n_s32(b0, DCT_CONST_BITS);
b1 = vrshrq_n_s32(b1, DCT_CONST_BITS);
b2 = vrshrq_n_s32(b2, DCT_CONST_BITS);
b3 = vrshrq_n_s32(b3, DCT_CONST_BITS);
a[0] = vaddq_s32(b0, b3);
a[1] = vaddq_s32(b1, b2);
a[2] = vsubq_s32(b1, b2);
a[3] = vsubq_s32(b0, b3);
}
static INLINE void idct4x4_16_kernel_bd12(const int32x4_t cospis,
int32x4_t *const a) {
int32x4_t b0, b1, b2, b3;
int64x2_t c[12];
transpose_s32_4x4(&a[0], &a[1], &a[2], &a[3]);
b0 = vaddq_s32(a[0], a[2]);
b1 = vsubq_s32(a[0], a[2]);
c[0] = vmull_lane_s32(vget_low_s32(b0), vget_high_s32(cospis), 0);
c[1] = vmull_lane_s32(vget_high_s32(b0), vget_high_s32(cospis), 0);
c[2] = vmull_lane_s32(vget_low_s32(b1), vget_high_s32(cospis), 0);
c[3] = vmull_lane_s32(vget_high_s32(b1), vget_high_s32(cospis), 0);
c[4] = vmull_lane_s32(vget_low_s32(a[1]), vget_high_s32(cospis), 1);
c[5] = vmull_lane_s32(vget_high_s32(a[1]), vget_high_s32(cospis), 1);
c[6] = vmull_lane_s32(vget_low_s32(a[1]), vget_low_s32(cospis), 1);
c[7] = vmull_lane_s32(vget_high_s32(a[1]), vget_low_s32(cospis), 1);
c[8] = vmull_lane_s32(vget_low_s32(a[3]), vget_low_s32(cospis), 1);
c[9] = vmull_lane_s32(vget_high_s32(a[3]), vget_low_s32(cospis), 1);
c[10] = vmull_lane_s32(vget_low_s32(a[3]), vget_high_s32(cospis), 1);
c[11] = vmull_lane_s32(vget_high_s32(a[3]), vget_high_s32(cospis), 1);
c[4] = vsubq_s64(c[4], c[8]);
c[5] = vsubq_s64(c[5], c[9]);
c[6] = vaddq_s64(c[6], c[10]);
c[7] = vaddq_s64(c[7], c[11]);
b0 = vcombine_s32(vrshrn_n_s64(c[0], DCT_CONST_BITS),
vrshrn_n_s64(c[1], DCT_CONST_BITS));
b1 = vcombine_s32(vrshrn_n_s64(c[2], DCT_CONST_BITS),
vrshrn_n_s64(c[3], DCT_CONST_BITS));
b2 = vcombine_s32(vrshrn_n_s64(c[4], DCT_CONST_BITS),
vrshrn_n_s64(c[5], DCT_CONST_BITS));
b3 = vcombine_s32(vrshrn_n_s64(c[6], DCT_CONST_BITS),
vrshrn_n_s64(c[7], DCT_CONST_BITS));
a[0] = vaddq_s32(b0, b3);
a[1] = vaddq_s32(b1, b2);
a[2] = vsubq_s32(b1, b2);
a[3] = vsubq_s32(b0, b3);
}
void vpx_highbd_idct4x4_16_add_neon(const tran_low_t *input, uint16_t *dest,
int stride, int bd) {
const int16x8_t max = vdupq_n_s16((1 << bd) - 1);
int16x8_t a[2];
int32x4_t c[4];
c[0] = vld1q_s32(input);
c[1] = vld1q_s32(input + 4);
c[2] = vld1q_s32(input + 8);
c[3] = vld1q_s32(input + 12);
if (bd == 8) {
// Rows
a[0] = vcombine_s16(vmovn_s32(c[0]), vmovn_s32(c[1]));
a[1] = vcombine_s16(vmovn_s32(c[2]), vmovn_s32(c[3]));
transpose_idct4x4_16_bd8(a);
// Columns
a[1] = vcombine_s16(vget_high_s16(a[1]), vget_low_s16(a[1]));
transpose_idct4x4_16_bd8(a);
a[0] = vrshrq_n_s16(a[0], 4);
a[1] = vrshrq_n_s16(a[1], 4);
} else {
const int32x4_t cospis = vld1q_s32(kCospi32);
if (bd == 10) {
idct4x4_16_kernel_bd10(cospis, c);
idct4x4_16_kernel_bd10(cospis, c);
} else {
idct4x4_16_kernel_bd12(cospis, c);
idct4x4_16_kernel_bd12(cospis, c);
}
a[0] = vcombine_s16(vqrshrn_n_s32(c[0], 4), vqrshrn_n_s32(c[1], 4));
a[1] = vcombine_s16(vqrshrn_n_s32(c[3], 4), vqrshrn_n_s32(c[2], 4));
}
highbd_idct4x4_1_add_kernel1(&dest, stride, a[0], max);
highbd_idct4x4_1_add_kernel2(&dest, stride, a[1], max);
}