ref: 7dd26ae967734f9b27b0ecbdbf2be89ecc8b6331
dir: /vp9/encoder/arm/neon/vp9_quantize_neon.c/
/*
* Copyright (c) 2014 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 <assert.h>
#include <math.h>
#include "./vpx_config.h"
#include "vpx_mem/vpx_mem.h"
#include "vp9/common/vp9_quant_common.h"
#include "vp9/common/vp9_seg_common.h"
#include "vp9/encoder/vp9_encoder.h"
#include "vp9/encoder/vp9_quantize.h"
#include "vp9/encoder/vp9_rd.h"
#include "vpx_dsp/arm/idct_neon.h"
#include "vpx_dsp/arm/mem_neon.h"
#include "vpx_dsp/vpx_dsp_common.h"
static INLINE void calculate_dqcoeff_and_store(const int16x8_t qcoeff,
const int16x8_t dequant,
tran_low_t *dqcoeff) {
const int32x4_t dqcoeff_0 =
vmull_s16(vget_low_s16(qcoeff), vget_low_s16(dequant));
const int32x4_t dqcoeff_1 =
vmull_s16(vget_high_s16(qcoeff), vget_high_s16(dequant));
#if CONFIG_VP9_HIGHBITDEPTH
vst1q_s32(dqcoeff, dqcoeff_0);
vst1q_s32(dqcoeff + 4, dqcoeff_1);
#else
vst1q_s16(dqcoeff, vcombine_s16(vmovn_s32(dqcoeff_0), vmovn_s32(dqcoeff_1)));
#endif // CONFIG_VP9_HIGHBITDEPTH
}
void vp9_quantize_fp_neon(const tran_low_t *coeff_ptr, intptr_t count,
int skip_block, const int16_t *round_ptr,
const int16_t *quant_ptr, tran_low_t *qcoeff_ptr,
tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr,
uint16_t *eob_ptr, const int16_t *scan,
const int16_t *iscan) {
// Quantization pass: All coefficients with index >= zero_flag are
// skippable. Note: zero_flag can be zero.
int i;
const int16x8_t v_zero = vdupq_n_s16(0);
const int16x8_t v_one = vdupq_n_s16(1);
int16x8_t v_eobmax_76543210 = vdupq_n_s16(-1);
int16x8_t v_round = vmovq_n_s16(round_ptr[1]);
int16x8_t v_quant = vmovq_n_s16(quant_ptr[1]);
int16x8_t v_dequant = vmovq_n_s16(dequant_ptr[1]);
(void)scan;
(void)skip_block;
assert(!skip_block);
// adjust for dc
v_round = vsetq_lane_s16(round_ptr[0], v_round, 0);
v_quant = vsetq_lane_s16(quant_ptr[0], v_quant, 0);
v_dequant = vsetq_lane_s16(dequant_ptr[0], v_dequant, 0);
// process dc and the first seven ac coeffs
{
const int16x8_t v_iscan = vld1q_s16(&iscan[0]);
const int16x8_t v_coeff = load_tran_low_to_s16q(coeff_ptr);
const int16x8_t v_coeff_sign = vshrq_n_s16(v_coeff, 15);
const int16x8_t v_abs = vabsq_s16(v_coeff);
const int16x8_t v_tmp = vqaddq_s16(v_abs, v_round);
const int32x4_t v_tmp_lo =
vmull_s16(vget_low_s16(v_tmp), vget_low_s16(v_quant));
const int32x4_t v_tmp_hi =
vmull_s16(vget_high_s16(v_tmp), vget_high_s16(v_quant));
const int16x8_t v_tmp2 =
vcombine_s16(vshrn_n_s32(v_tmp_lo, 16), vshrn_n_s32(v_tmp_hi, 16));
const uint16x8_t v_nz_mask = vceqq_s16(v_tmp2, v_zero);
const int16x8_t v_iscan_plus1 = vaddq_s16(v_iscan, v_one);
const int16x8_t v_nz_iscan = vbslq_s16(v_nz_mask, v_zero, v_iscan_plus1);
const int16x8_t v_qcoeff_a = veorq_s16(v_tmp2, v_coeff_sign);
const int16x8_t v_qcoeff = vsubq_s16(v_qcoeff_a, v_coeff_sign);
calculate_dqcoeff_and_store(v_qcoeff, v_dequant, dqcoeff_ptr);
v_eobmax_76543210 = vmaxq_s16(v_eobmax_76543210, v_nz_iscan);
store_s16q_to_tran_low(qcoeff_ptr, v_qcoeff);
v_round = vmovq_n_s16(round_ptr[1]);
v_quant = vmovq_n_s16(quant_ptr[1]);
v_dequant = vmovq_n_s16(dequant_ptr[1]);
}
// now process the rest of the ac coeffs
for (i = 8; i < count; i += 8) {
const int16x8_t v_iscan = vld1q_s16(&iscan[i]);
const int16x8_t v_coeff = load_tran_low_to_s16q(coeff_ptr + i);
const int16x8_t v_coeff_sign = vshrq_n_s16(v_coeff, 15);
const int16x8_t v_abs = vabsq_s16(v_coeff);
const int16x8_t v_tmp = vqaddq_s16(v_abs, v_round);
const int32x4_t v_tmp_lo =
vmull_s16(vget_low_s16(v_tmp), vget_low_s16(v_quant));
const int32x4_t v_tmp_hi =
vmull_s16(vget_high_s16(v_tmp), vget_high_s16(v_quant));
const int16x8_t v_tmp2 =
vcombine_s16(vshrn_n_s32(v_tmp_lo, 16), vshrn_n_s32(v_tmp_hi, 16));
const uint16x8_t v_nz_mask = vceqq_s16(v_tmp2, v_zero);
const int16x8_t v_iscan_plus1 = vaddq_s16(v_iscan, v_one);
const int16x8_t v_nz_iscan = vbslq_s16(v_nz_mask, v_zero, v_iscan_plus1);
const int16x8_t v_qcoeff_a = veorq_s16(v_tmp2, v_coeff_sign);
const int16x8_t v_qcoeff = vsubq_s16(v_qcoeff_a, v_coeff_sign);
calculate_dqcoeff_and_store(v_qcoeff, v_dequant, dqcoeff_ptr + i);
v_eobmax_76543210 = vmaxq_s16(v_eobmax_76543210, v_nz_iscan);
store_s16q_to_tran_low(qcoeff_ptr + i, v_qcoeff);
}
#ifdef __aarch64__
*eob_ptr = vmaxvq_s16(v_eobmax_76543210);
#else
{
const int16x4_t v_eobmax_3210 = vmax_s16(vget_low_s16(v_eobmax_76543210),
vget_high_s16(v_eobmax_76543210));
const int64x1_t v_eobmax_xx32 =
vshr_n_s64(vreinterpret_s64_s16(v_eobmax_3210), 32);
const int16x4_t v_eobmax_tmp =
vmax_s16(v_eobmax_3210, vreinterpret_s16_s64(v_eobmax_xx32));
const int64x1_t v_eobmax_xxx3 =
vshr_n_s64(vreinterpret_s64_s16(v_eobmax_tmp), 16);
const int16x4_t v_eobmax_final =
vmax_s16(v_eobmax_tmp, vreinterpret_s16_s64(v_eobmax_xxx3));
*eob_ptr = (uint16_t)vget_lane_s16(v_eobmax_final, 0);
}
#endif // __aarch64__
}
static INLINE int32x4_t extract_sign_bit(int32x4_t a) {
return vreinterpretq_s32_u32(vshrq_n_u32(vreinterpretq_u32_s32(a), 31));
}
void vp9_quantize_fp_32x32_neon(const tran_low_t *coeff_ptr, intptr_t count,
int skip_block, const int16_t *round_ptr,
const int16_t *quant_ptr,
tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr,
const int16_t *dequant_ptr, uint16_t *eob_ptr,
const int16_t *scan, const int16_t *iscan) {
const int16x8_t one = vdupq_n_s16(1);
const int16x8_t neg_one = vdupq_n_s16(-1);
// ROUND_POWER_OF_TWO(round_ptr[], 1)
const int16x8_t round = vrshrq_n_s16(vld1q_s16(round_ptr), 1);
const int16x8_t quant = vld1q_s16(quant_ptr);
const int16x4_t dequant = vld1_s16(dequant_ptr);
// dequant >> 2 is used similar to zbin as a threshold.
const int16x8_t dequant_thresh = vshrq_n_s16(vld1q_s16(dequant_ptr), 2);
// Process dc and the first seven ac coeffs.
const uint16x8_t v_iscan =
vreinterpretq_u16_s16(vaddq_s16(vld1q_s16(iscan), one));
const int16x8_t coeff = load_tran_low_to_s16q(coeff_ptr);
const int16x8_t coeff_sign = vshrq_n_s16(coeff, 15);
const int16x8_t coeff_abs = vabsq_s16(coeff);
const int16x8_t dequant_mask =
vreinterpretq_s16_u16(vcgeq_s16(coeff_abs, dequant_thresh));
int16x8_t qcoeff = vqaddq_s16(coeff_abs, round);
int32x4_t dqcoeff_0, dqcoeff_1;
uint16x8_t eob_max;
(void)scan;
(void)count;
(void)skip_block;
assert(!skip_block);
// coeff * quant_ptr[]) >> 15
qcoeff = vqdmulhq_s16(qcoeff, quant);
// Restore sign.
qcoeff = veorq_s16(qcoeff, coeff_sign);
qcoeff = vsubq_s16(qcoeff, coeff_sign);
qcoeff = vandq_s16(qcoeff, dequant_mask);
// qcoeff * dequant[] / 2
dqcoeff_0 = vmull_s16(vget_low_s16(qcoeff), dequant);
dqcoeff_1 = vmull_n_s16(vget_high_s16(qcoeff), dequant_ptr[1]);
// Add 1 if negative to round towards zero because the C uses division.
dqcoeff_0 = vaddq_s32(dqcoeff_0, extract_sign_bit(dqcoeff_0));
dqcoeff_1 = vaddq_s32(dqcoeff_1, extract_sign_bit(dqcoeff_1));
#if CONFIG_VP9_HIGHBITDEPTH
vst1q_s32(dqcoeff_ptr, vshrq_n_s32(dqcoeff_0, 1));
vst1q_s32(dqcoeff_ptr + 4, vshrq_n_s32(dqcoeff_1, 1));
#else
store_s16q_to_tran_low(dqcoeff_ptr, vcombine_s16(vshrn_n_s32(dqcoeff_0, 1),
vshrn_n_s32(dqcoeff_1, 1)));
#endif
eob_max = vandq_u16(vtstq_s16(qcoeff, neg_one), v_iscan);
store_s16q_to_tran_low(qcoeff_ptr, qcoeff);
iscan += 8;
coeff_ptr += 8;
qcoeff_ptr += 8;
dqcoeff_ptr += 8;
{
int i;
const int16x8_t round = vrshrq_n_s16(vmovq_n_s16(round_ptr[1]), 1);
const int16x8_t quant = vmovq_n_s16(quant_ptr[1]);
const int16x8_t dequant_thresh =
vshrq_n_s16(vmovq_n_s16(dequant_ptr[1]), 2);
// Process the rest of the ac coeffs.
for (i = 8; i < 32 * 32; i += 8) {
const uint16x8_t v_iscan =
vreinterpretq_u16_s16(vaddq_s16(vld1q_s16(iscan), one));
const int16x8_t coeff = load_tran_low_to_s16q(coeff_ptr);
const int16x8_t coeff_sign = vshrq_n_s16(coeff, 15);
const int16x8_t coeff_abs = vabsq_s16(coeff);
const int16x8_t dequant_mask =
vreinterpretq_s16_u16(vcgeq_s16(coeff_abs, dequant_thresh));
int16x8_t qcoeff = vqaddq_s16(coeff_abs, round);
int32x4_t dqcoeff_0, dqcoeff_1;
qcoeff = vqdmulhq_s16(qcoeff, quant);
qcoeff = veorq_s16(qcoeff, coeff_sign);
qcoeff = vsubq_s16(qcoeff, coeff_sign);
qcoeff = vandq_s16(qcoeff, dequant_mask);
dqcoeff_0 = vmull_n_s16(vget_low_s16(qcoeff), dequant_ptr[1]);
dqcoeff_1 = vmull_n_s16(vget_high_s16(qcoeff), dequant_ptr[1]);
dqcoeff_0 = vaddq_s32(dqcoeff_0, extract_sign_bit(dqcoeff_0));
dqcoeff_1 = vaddq_s32(dqcoeff_1, extract_sign_bit(dqcoeff_1));
#if CONFIG_VP9_HIGHBITDEPTH
vst1q_s32(dqcoeff_ptr, vshrq_n_s32(dqcoeff_0, 1));
vst1q_s32(dqcoeff_ptr + 4, vshrq_n_s32(dqcoeff_1, 1));
#else
store_s16q_to_tran_low(
dqcoeff_ptr,
vcombine_s16(vshrn_n_s32(dqcoeff_0, 1), vshrn_n_s32(dqcoeff_1, 1)));
#endif
eob_max =
vmaxq_u16(eob_max, vandq_u16(vtstq_s16(qcoeff, neg_one), v_iscan));
store_s16q_to_tran_low(qcoeff_ptr, qcoeff);
iscan += 8;
coeff_ptr += 8;
qcoeff_ptr += 8;
dqcoeff_ptr += 8;
}
#ifdef __aarch64__
*eob_ptr = vmaxvq_u16(eob_max);
#else
{
const uint16x4_t eob_max_0 =
vmax_u16(vget_low_u16(eob_max), vget_high_u16(eob_max));
const uint16x4_t eob_max_1 = vpmax_u16(eob_max_0, eob_max_0);
const uint16x4_t eob_max_2 = vpmax_u16(eob_max_1, eob_max_1);
vst1_lane_u16(eob_ptr, eob_max_2, 0);
}
#endif // __aarch64__
}
}