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/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include <arm_neon.h>
#include "config/aom_config.h"
#include "aom_dsp/txfm_common.h"
#include "aom_dsp/arm/mem_neon.h"
#include "aom_dsp/arm/transpose_neon.h"
static void aom_fdct4x4_helper(const int16_t *input, int stride,
int16x4_t *input_0, int16x4_t *input_1,
int16x4_t *input_2, int16x4_t *input_3) {
*input_0 = vshl_n_s16(vld1_s16(input + 0 * stride), 4);
*input_1 = vshl_n_s16(vld1_s16(input + 1 * stride), 4);
*input_2 = vshl_n_s16(vld1_s16(input + 2 * stride), 4);
*input_3 = vshl_n_s16(vld1_s16(input + 3 * stride), 4);
// If the very first value != 0, then add 1.
if (input[0] != 0) {
const int16x4_t one = vreinterpret_s16_s64(vdup_n_s64(1));
*input_0 = vadd_s16(*input_0, one);
}
for (int i = 0; i < 2; ++i) {
const int16x8_t input_01 = vcombine_s16(*input_0, *input_1);
const int16x8_t input_32 = vcombine_s16(*input_3, *input_2);
// in_0 +/- in_3, in_1 +/- in_2
const int16x8_t s_01 = vaddq_s16(input_01, input_32);
const int16x8_t s_32 = vsubq_s16(input_01, input_32);
// step_0 +/- step_1, step_2 +/- step_3
const int16x4_t s_0 = vget_low_s16(s_01);
const int16x4_t s_1 = vget_high_s16(s_01);
const int16x4_t s_2 = vget_high_s16(s_32);
const int16x4_t s_3 = vget_low_s16(s_32);
// (s_0 +/- s_1) * cospi_16_64
// Must expand all elements to s32. See 'needs32' comment in fwd_txfm.c.
const int32x4_t s_0_p_s_1 = vaddl_s16(s_0, s_1);
const int32x4_t s_0_m_s_1 = vsubl_s16(s_0, s_1);
const int32x4_t temp1 = vmulq_n_s32(s_0_p_s_1, (int32_t)cospi_16_64);
const int32x4_t temp2 = vmulq_n_s32(s_0_m_s_1, (int32_t)cospi_16_64);
// fdct_round_shift
int16x4_t out_0 = vrshrn_n_s32(temp1, DCT_CONST_BITS);
int16x4_t out_2 = vrshrn_n_s32(temp2, DCT_CONST_BITS);
// s_3 * cospi_8_64 + s_2 * cospi_24_64
// s_3 * cospi_24_64 - s_2 * cospi_8_64
const int32x4_t s_3_cospi_8_64 = vmull_n_s16(s_3, (int32_t)cospi_8_64);
const int32x4_t s_3_cospi_24_64 = vmull_n_s16(s_3, (int32_t)cospi_24_64);
const int32x4_t temp3 =
vmlal_n_s16(s_3_cospi_8_64, s_2, (int32_t)cospi_24_64);
const int32x4_t temp4 =
vmlsl_n_s16(s_3_cospi_24_64, s_2, (int32_t)cospi_8_64);
// fdct_round_shift
int16x4_t out_1 = vrshrn_n_s32(temp3, DCT_CONST_BITS);
int16x4_t out_3 = vrshrn_n_s32(temp4, DCT_CONST_BITS);
// Only transpose the first pass
if (i == 0) {
transpose_elems_inplace_s16_4x4(&out_0, &out_1, &out_2, &out_3);
}
*input_0 = out_0;
*input_1 = out_1;
*input_2 = out_2;
*input_3 = out_3;
}
}
void aom_fdct4x4_neon(const int16_t *input, tran_low_t *final_output,
int stride) {
// input[M * stride] * 16
int16x4_t input_0, input_1, input_2, input_3;
aom_fdct4x4_helper(input, stride, &input_0, &input_1, &input_2, &input_3);
// Not quite a rounding shift. Only add 1 despite shifting by 2.
const int16x8_t one = vdupq_n_s16(1);
int16x8_t out_01 = vcombine_s16(input_0, input_1);
int16x8_t out_23 = vcombine_s16(input_2, input_3);
out_01 = vshrq_n_s16(vaddq_s16(out_01, one), 2);
out_23 = vshrq_n_s16(vaddq_s16(out_23, one), 2);
store_s16q_to_tran_low(final_output + 0 * 8, out_01);
store_s16q_to_tran_low(final_output + 1 * 8, out_23);
}
void aom_fdct4x4_lp_neon(const int16_t *input, int16_t *final_output,
int stride) {
// input[M * stride] * 16
int16x4_t input_0, input_1, input_2, input_3;
aom_fdct4x4_helper(input, stride, &input_0, &input_1, &input_2, &input_3);
// Not quite a rounding shift. Only add 1 despite shifting by 2.
const int16x8_t one = vdupq_n_s16(1);
int16x8_t out_01 = vcombine_s16(input_0, input_1);
int16x8_t out_23 = vcombine_s16(input_2, input_3);
out_01 = vshrq_n_s16(vaddq_s16(out_01, one), 2);
out_23 = vshrq_n_s16(vaddq_s16(out_23, one), 2);
vst1q_s16(final_output + 0 * 8, out_01);
vst1q_s16(final_output + 1 * 8, out_23);
}
void aom_fdct8x8_neon(const int16_t *input, int16_t *final_output, int stride) {
// stage 1
int16x8_t input_0 = vshlq_n_s16(vld1q_s16(&input[0 * stride]), 2);
int16x8_t input_1 = vshlq_n_s16(vld1q_s16(&input[1 * stride]), 2);
int16x8_t input_2 = vshlq_n_s16(vld1q_s16(&input[2 * stride]), 2);
int16x8_t input_3 = vshlq_n_s16(vld1q_s16(&input[3 * stride]), 2);
int16x8_t input_4 = vshlq_n_s16(vld1q_s16(&input[4 * stride]), 2);
int16x8_t input_5 = vshlq_n_s16(vld1q_s16(&input[5 * stride]), 2);
int16x8_t input_6 = vshlq_n_s16(vld1q_s16(&input[6 * stride]), 2);
int16x8_t input_7 = vshlq_n_s16(vld1q_s16(&input[7 * stride]), 2);
for (int i = 0; i < 2; ++i) {
int16x8_t out_0, out_1, out_2, out_3, out_4, out_5, out_6, out_7;
const int16x8_t v_s0 = vaddq_s16(input_0, input_7);
const int16x8_t v_s1 = vaddq_s16(input_1, input_6);
const int16x8_t v_s2 = vaddq_s16(input_2, input_5);
const int16x8_t v_s3 = vaddq_s16(input_3, input_4);
const int16x8_t v_s4 = vsubq_s16(input_3, input_4);
const int16x8_t v_s5 = vsubq_s16(input_2, input_5);
const int16x8_t v_s6 = vsubq_s16(input_1, input_6);
const int16x8_t v_s7 = vsubq_s16(input_0, input_7);
// fdct4(step, step);
int16x8_t v_x0 = vaddq_s16(v_s0, v_s3);
int16x8_t v_x1 = vaddq_s16(v_s1, v_s2);
int16x8_t v_x2 = vsubq_s16(v_s1, v_s2);
int16x8_t v_x3 = vsubq_s16(v_s0, v_s3);
// fdct4(step, step);
int32x4_t v_t0_lo = vaddl_s16(vget_low_s16(v_x0), vget_low_s16(v_x1));
int32x4_t v_t0_hi = vaddl_s16(vget_high_s16(v_x0), vget_high_s16(v_x1));
int32x4_t v_t1_lo = vsubl_s16(vget_low_s16(v_x0), vget_low_s16(v_x1));
int32x4_t v_t1_hi = vsubl_s16(vget_high_s16(v_x0), vget_high_s16(v_x1));
int32x4_t v_t2_lo = vmull_n_s16(vget_low_s16(v_x2), (int16_t)cospi_24_64);
int32x4_t v_t2_hi = vmull_n_s16(vget_high_s16(v_x2), (int16_t)cospi_24_64);
int32x4_t v_t3_lo = vmull_n_s16(vget_low_s16(v_x3), (int16_t)cospi_24_64);
int32x4_t v_t3_hi = vmull_n_s16(vget_high_s16(v_x3), (int16_t)cospi_24_64);
v_t2_lo = vmlal_n_s16(v_t2_lo, vget_low_s16(v_x3), (int16_t)cospi_8_64);
v_t2_hi = vmlal_n_s16(v_t2_hi, vget_high_s16(v_x3), (int16_t)cospi_8_64);
v_t3_lo = vmlsl_n_s16(v_t3_lo, vget_low_s16(v_x2), (int16_t)cospi_8_64);
v_t3_hi = vmlsl_n_s16(v_t3_hi, vget_high_s16(v_x2), (int16_t)cospi_8_64);
v_t0_lo = vmulq_n_s32(v_t0_lo, (int32_t)cospi_16_64);
v_t0_hi = vmulq_n_s32(v_t0_hi, (int32_t)cospi_16_64);
v_t1_lo = vmulq_n_s32(v_t1_lo, (int32_t)cospi_16_64);
v_t1_hi = vmulq_n_s32(v_t1_hi, (int32_t)cospi_16_64);
{
const int16x4_t a = vrshrn_n_s32(v_t0_lo, DCT_CONST_BITS);
const int16x4_t b = vrshrn_n_s32(v_t0_hi, DCT_CONST_BITS);
const int16x4_t c = vrshrn_n_s32(v_t1_lo, DCT_CONST_BITS);
const int16x4_t d = vrshrn_n_s32(v_t1_hi, DCT_CONST_BITS);
const int16x4_t e = vrshrn_n_s32(v_t2_lo, DCT_CONST_BITS);
const int16x4_t f = vrshrn_n_s32(v_t2_hi, DCT_CONST_BITS);
const int16x4_t g = vrshrn_n_s32(v_t3_lo, DCT_CONST_BITS);
const int16x4_t h = vrshrn_n_s32(v_t3_hi, DCT_CONST_BITS);
out_0 = vcombine_s16(a, c); // 00 01 02 03 40 41 42 43
out_2 = vcombine_s16(e, g); // 20 21 22 23 60 61 62 63
out_4 = vcombine_s16(b, d); // 04 05 06 07 44 45 46 47
out_6 = vcombine_s16(f, h); // 24 25 26 27 64 65 66 67
}
// Stage 2
v_x0 = vsubq_s16(v_s6, v_s5);
v_x1 = vaddq_s16(v_s6, v_s5);
v_t0_lo = vmull_n_s16(vget_low_s16(v_x0), (int16_t)cospi_16_64);
v_t0_hi = vmull_n_s16(vget_high_s16(v_x0), (int16_t)cospi_16_64);
v_t1_lo = vmull_n_s16(vget_low_s16(v_x1), (int16_t)cospi_16_64);
v_t1_hi = vmull_n_s16(vget_high_s16(v_x1), (int16_t)cospi_16_64);
{
const int16x4_t a = vrshrn_n_s32(v_t0_lo, DCT_CONST_BITS);
const int16x4_t b = vrshrn_n_s32(v_t0_hi, DCT_CONST_BITS);
const int16x4_t c = vrshrn_n_s32(v_t1_lo, DCT_CONST_BITS);
const int16x4_t d = vrshrn_n_s32(v_t1_hi, DCT_CONST_BITS);
const int16x8_t ab = vcombine_s16(a, b);
const int16x8_t cd = vcombine_s16(c, d);
// Stage 3
v_x0 = vaddq_s16(v_s4, ab);
v_x1 = vsubq_s16(v_s4, ab);
v_x2 = vsubq_s16(v_s7, cd);
v_x3 = vaddq_s16(v_s7, cd);
}
// Stage 4
v_t0_lo = vmull_n_s16(vget_low_s16(v_x3), (int16_t)cospi_4_64);
v_t0_hi = vmull_n_s16(vget_high_s16(v_x3), (int16_t)cospi_4_64);
v_t0_lo = vmlal_n_s16(v_t0_lo, vget_low_s16(v_x0), (int16_t)cospi_28_64);
v_t0_hi = vmlal_n_s16(v_t0_hi, vget_high_s16(v_x0), (int16_t)cospi_28_64);
v_t1_lo = vmull_n_s16(vget_low_s16(v_x1), (int16_t)cospi_12_64);
v_t1_hi = vmull_n_s16(vget_high_s16(v_x1), (int16_t)cospi_12_64);
v_t1_lo = vmlal_n_s16(v_t1_lo, vget_low_s16(v_x2), (int16_t)cospi_20_64);
v_t1_hi = vmlal_n_s16(v_t1_hi, vget_high_s16(v_x2), (int16_t)cospi_20_64);
v_t2_lo = vmull_n_s16(vget_low_s16(v_x2), (int16_t)cospi_12_64);
v_t2_hi = vmull_n_s16(vget_high_s16(v_x2), (int16_t)cospi_12_64);
v_t2_lo = vmlsl_n_s16(v_t2_lo, vget_low_s16(v_x1), (int16_t)cospi_20_64);
v_t2_hi = vmlsl_n_s16(v_t2_hi, vget_high_s16(v_x1), (int16_t)cospi_20_64);
v_t3_lo = vmull_n_s16(vget_low_s16(v_x3), (int16_t)cospi_28_64);
v_t3_hi = vmull_n_s16(vget_high_s16(v_x3), (int16_t)cospi_28_64);
v_t3_lo = vmlsl_n_s16(v_t3_lo, vget_low_s16(v_x0), (int16_t)cospi_4_64);
v_t3_hi = vmlsl_n_s16(v_t3_hi, vget_high_s16(v_x0), (int16_t)cospi_4_64);
{
const int16x4_t a = vrshrn_n_s32(v_t0_lo, DCT_CONST_BITS);
const int16x4_t b = vrshrn_n_s32(v_t0_hi, DCT_CONST_BITS);
const int16x4_t c = vrshrn_n_s32(v_t1_lo, DCT_CONST_BITS);
const int16x4_t d = vrshrn_n_s32(v_t1_hi, DCT_CONST_BITS);
const int16x4_t e = vrshrn_n_s32(v_t2_lo, DCT_CONST_BITS);
const int16x4_t f = vrshrn_n_s32(v_t2_hi, DCT_CONST_BITS);
const int16x4_t g = vrshrn_n_s32(v_t3_lo, DCT_CONST_BITS);
const int16x4_t h = vrshrn_n_s32(v_t3_hi, DCT_CONST_BITS);
out_1 = vcombine_s16(a, c); // 10 11 12 13 50 51 52 53
out_3 = vcombine_s16(e, g); // 30 31 32 33 70 71 72 73
out_5 = vcombine_s16(b, d); // 14 15 16 17 54 55 56 57
out_7 = vcombine_s16(f, h); // 34 35 36 37 74 75 76 77
}
// transpose 8x8
{
// 00 01 02 03 40 41 42 43
// 10 11 12 13 50 51 52 53
// 20 21 22 23 60 61 62 63
// 30 31 32 33 70 71 72 73
// 04 05 06 07 44 45 46 47
// 14 15 16 17 54 55 56 57
// 24 25 26 27 64 65 66 67
// 34 35 36 37 74 75 76 77
const int32x4x2_t r02_s32 =
vtrnq_s32(vreinterpretq_s32_s16(out_0), vreinterpretq_s32_s16(out_2));
const int32x4x2_t r13_s32 =
vtrnq_s32(vreinterpretq_s32_s16(out_1), vreinterpretq_s32_s16(out_3));
const int32x4x2_t r46_s32 =
vtrnq_s32(vreinterpretq_s32_s16(out_4), vreinterpretq_s32_s16(out_6));
const int32x4x2_t r57_s32 =
vtrnq_s32(vreinterpretq_s32_s16(out_5), vreinterpretq_s32_s16(out_7));
const int16x8x2_t r01_s16 =
vtrnq_s16(vreinterpretq_s16_s32(r02_s32.val[0]),
vreinterpretq_s16_s32(r13_s32.val[0]));
const int16x8x2_t r23_s16 =
vtrnq_s16(vreinterpretq_s16_s32(r02_s32.val[1]),
vreinterpretq_s16_s32(r13_s32.val[1]));
const int16x8x2_t r45_s16 =
vtrnq_s16(vreinterpretq_s16_s32(r46_s32.val[0]),
vreinterpretq_s16_s32(r57_s32.val[0]));
const int16x8x2_t r67_s16 =
vtrnq_s16(vreinterpretq_s16_s32(r46_s32.val[1]),
vreinterpretq_s16_s32(r57_s32.val[1]));
input_0 = r01_s16.val[0];
input_1 = r01_s16.val[1];
input_2 = r23_s16.val[0];
input_3 = r23_s16.val[1];
input_4 = r45_s16.val[0];
input_5 = r45_s16.val[1];
input_6 = r67_s16.val[0];
input_7 = r67_s16.val[1];
// 00 10 20 30 40 50 60 70
// 01 11 21 31 41 51 61 71
// 02 12 22 32 42 52 62 72
// 03 13 23 33 43 53 63 73
// 04 14 24 34 44 54 64 74
// 05 15 25 35 45 55 65 75
// 06 16 26 36 46 56 66 76
// 07 17 27 37 47 57 67 77
}
} // for
{
// from aom_dct_sse2.c
// Post-condition (division by two)
// division of two 16 bits signed numbers using shifts
// n / 2 = (n - (n >> 15)) >> 1
const int16x8_t sign_in0 = vshrq_n_s16(input_0, 15);
const int16x8_t sign_in1 = vshrq_n_s16(input_1, 15);
const int16x8_t sign_in2 = vshrq_n_s16(input_2, 15);
const int16x8_t sign_in3 = vshrq_n_s16(input_3, 15);
const int16x8_t sign_in4 = vshrq_n_s16(input_4, 15);
const int16x8_t sign_in5 = vshrq_n_s16(input_5, 15);
const int16x8_t sign_in6 = vshrq_n_s16(input_6, 15);
const int16x8_t sign_in7 = vshrq_n_s16(input_7, 15);
input_0 = vhsubq_s16(input_0, sign_in0);
input_1 = vhsubq_s16(input_1, sign_in1);
input_2 = vhsubq_s16(input_2, sign_in2);
input_3 = vhsubq_s16(input_3, sign_in3);
input_4 = vhsubq_s16(input_4, sign_in4);
input_5 = vhsubq_s16(input_5, sign_in5);
input_6 = vhsubq_s16(input_6, sign_in6);
input_7 = vhsubq_s16(input_7, sign_in7);
// store results
vst1q_s16(&final_output[0 * 8], input_0);
vst1q_s16(&final_output[1 * 8], input_1);
vst1q_s16(&final_output[2 * 8], input_2);
vst1q_s16(&final_output[3 * 8], input_3);
vst1q_s16(&final_output[4 * 8], input_4);
vst1q_s16(&final_output[5 * 8], input_5);
vst1q_s16(&final_output[6 * 8], input_6);
vst1q_s16(&final_output[7 * 8], input_7);
}
}
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