1 /*
2 * Copyright (c) 2022, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #include <arm_neon.h>
13
14 #include "config/aom_config.h"
15
16 #include "aom_dsp/arm/mem_neon.h"
17
18 #include "av1/common/quant_common.h"
19 #include "av1/encoder/av1_quantize.h"
20
quantize_4(const tran_low_t * coeff_ptr,tran_low_t * qcoeff_ptr,tran_low_t * dqcoeff_ptr,int32x4_t v_quant_s32,int32x4_t v_dequant_s32,int32x4_t v_round_s32,int log_scale)21 static inline uint16x4_t quantize_4(const tran_low_t *coeff_ptr,
22 tran_low_t *qcoeff_ptr,
23 tran_low_t *dqcoeff_ptr,
24 int32x4_t v_quant_s32,
25 int32x4_t v_dequant_s32,
26 int32x4_t v_round_s32, int log_scale) {
27 const int32x4_t v_coeff = vld1q_s32(coeff_ptr);
28 const int32x4_t v_coeff_sign =
29 vreinterpretq_s32_u32(vcltq_s32(v_coeff, vdupq_n_s32(0)));
30 const int32x4_t v_log_scale = vdupq_n_s32(log_scale);
31 const int32x4_t v_abs_coeff = vabsq_s32(v_coeff);
32 // ((abs_coeff << (1 + log_scale)) >= dequant_ptr[rc01])
33 const int32x4_t v_abs_coeff_scaled =
34 vshlq_s32(v_abs_coeff, vdupq_n_s32(1 + log_scale));
35 const uint32x4_t v_mask = vcgeq_s32(v_abs_coeff_scaled, v_dequant_s32);
36 // const int64_t tmp = vmask ? (int64_t)abs_coeff + log_scaled_round : 0
37 const int32x4_t v_tmp = vandq_s32(vaddq_s32(v_abs_coeff, v_round_s32),
38 vreinterpretq_s32_u32(v_mask));
39 // const int abs_qcoeff = (int)((tmp * quant) >> (16 - log_scale));
40 const int32x4_t v_abs_qcoeff =
41 vqdmulhq_s32(vshlq_s32(v_tmp, v_log_scale), v_quant_s32);
42 // qcoeff_ptr[rc] = (tran_low_t)((abs_qcoeff ^ coeff_sign) - coeff_sign);
43 const int32x4_t v_qcoeff =
44 vsubq_s32(veorq_s32(v_abs_qcoeff, v_coeff_sign), v_coeff_sign);
45 // vshlq_s32 will shift right if shift value is negative.
46 const int32x4_t v_abs_dqcoeff =
47 vshlq_s32(vmulq_s32(v_abs_qcoeff, v_dequant_s32), vnegq_s32(v_log_scale));
48 // dqcoeff_ptr[rc] = (tran_low_t)((abs_dqcoeff ^ coeff_sign) - coeff_sign);
49 const int32x4_t v_dqcoeff =
50 vsubq_s32(veorq_s32(v_abs_dqcoeff, v_coeff_sign), v_coeff_sign);
51
52 vst1q_s32(qcoeff_ptr, v_qcoeff);
53 vst1q_s32(dqcoeff_ptr, v_dqcoeff);
54
55 // Used to find eob.
56 const uint32x4_t nz_qcoeff_mask = vcgtq_s32(v_abs_qcoeff, vdupq_n_s32(0));
57 return vmovn_u32(nz_qcoeff_mask);
58 }
59
get_max_lane_eob(const int16_t * iscan,int16x8_t v_eobmax,uint16x8_t v_mask)60 static inline int16x8_t get_max_lane_eob(const int16_t *iscan,
61 int16x8_t v_eobmax,
62 uint16x8_t v_mask) {
63 const int16x8_t v_iscan = vld1q_s16(&iscan[0]);
64 const int16x8_t v_iscan_plus1 = vaddq_s16(v_iscan, vdupq_n_s16(1));
65 const int16x8_t v_nz_iscan = vbslq_s16(v_mask, v_iscan_plus1, vdupq_n_s16(0));
66 return vmaxq_s16(v_eobmax, v_nz_iscan);
67 }
68
get_max_eob(int16x8_t v_eobmax)69 static inline uint16_t get_max_eob(int16x8_t v_eobmax) {
70 #if AOM_ARCH_AARCH64
71 return (uint16_t)vmaxvq_s16(v_eobmax);
72 #else
73 const int16x4_t v_eobmax_3210 =
74 vmax_s16(vget_low_s16(v_eobmax), vget_high_s16(v_eobmax));
75 const int64x1_t v_eobmax_xx32 =
76 vshr_n_s64(vreinterpret_s64_s16(v_eobmax_3210), 32);
77 const int16x4_t v_eobmax_tmp =
78 vmax_s16(v_eobmax_3210, vreinterpret_s16_s64(v_eobmax_xx32));
79 const int64x1_t v_eobmax_xxx3 =
80 vshr_n_s64(vreinterpret_s64_s16(v_eobmax_tmp), 16);
81 const int16x4_t v_eobmax_final =
82 vmax_s16(v_eobmax_tmp, vreinterpret_s16_s64(v_eobmax_xxx3));
83 return (uint16_t)vget_lane_s16(v_eobmax_final, 0);
84 #endif
85 }
86
av1_highbd_quantize_fp_neon(const tran_low_t * coeff_ptr,intptr_t count,const int16_t * zbin_ptr,const int16_t * round_ptr,const int16_t * quant_ptr,const int16_t * quant_shift_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,int log_scale)87 void av1_highbd_quantize_fp_neon(
88 const tran_low_t *coeff_ptr, intptr_t count, const int16_t *zbin_ptr,
89 const int16_t *round_ptr, const int16_t *quant_ptr,
90 const int16_t *quant_shift_ptr, tran_low_t *qcoeff_ptr,
91 tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr, uint16_t *eob_ptr,
92 const int16_t *scan, const int16_t *iscan, int log_scale) {
93 (void)scan;
94 (void)zbin_ptr;
95 (void)quant_shift_ptr;
96
97 const int16x4_t v_quant = vld1_s16(quant_ptr);
98 const int16x4_t v_dequant = vld1_s16(dequant_ptr);
99 const int16x4_t v_zero = vdup_n_s16(0);
100 const uint16x4_t v_round_select = vcgt_s16(vdup_n_s16(log_scale), v_zero);
101 const int16x4_t v_round_no_scale = vld1_s16(round_ptr);
102 const int16x4_t v_round_log_scale =
103 vqrdmulh_n_s16(v_round_no_scale, (int16_t)(1 << (15 - log_scale)));
104 const int16x4_t v_round =
105 vbsl_s16(v_round_select, v_round_log_scale, v_round_no_scale);
106 int32x4_t v_round_s32 = vaddl_s16(v_round, v_zero);
107 int32x4_t v_quant_s32 = vshlq_n_s32(vaddl_s16(v_quant, v_zero), 15);
108 int32x4_t v_dequant_s32 = vaddl_s16(v_dequant, v_zero);
109 uint16x4_t v_mask_lo, v_mask_hi;
110 int16x8_t v_eobmax = vdupq_n_s16(-1);
111
112 // DC and first 3 AC
113 v_mask_lo = quantize_4(coeff_ptr, qcoeff_ptr, dqcoeff_ptr, v_quant_s32,
114 v_dequant_s32, v_round_s32, log_scale);
115
116 // overwrite the DC constants with AC constants
117 v_round_s32 = vdupq_lane_s32(vget_low_s32(v_round_s32), 1);
118 v_quant_s32 = vdupq_lane_s32(vget_low_s32(v_quant_s32), 1);
119 v_dequant_s32 = vdupq_lane_s32(vget_low_s32(v_dequant_s32), 1);
120
121 // 4 more AC
122 v_mask_hi = quantize_4(coeff_ptr + 4, qcoeff_ptr + 4, dqcoeff_ptr + 4,
123 v_quant_s32, v_dequant_s32, v_round_s32, log_scale);
124
125 // Find the max lane eob for the first 8 coeffs.
126 v_eobmax =
127 get_max_lane_eob(iscan, v_eobmax, vcombine_u16(v_mask_lo, v_mask_hi));
128
129 count -= 8;
130 do {
131 coeff_ptr += 8;
132 qcoeff_ptr += 8;
133 dqcoeff_ptr += 8;
134 iscan += 8;
135 v_mask_lo = quantize_4(coeff_ptr, qcoeff_ptr, dqcoeff_ptr, v_quant_s32,
136 v_dequant_s32, v_round_s32, log_scale);
137 v_mask_hi = quantize_4(coeff_ptr + 4, qcoeff_ptr + 4, dqcoeff_ptr + 4,
138 v_quant_s32, v_dequant_s32, v_round_s32, log_scale);
139 // Find the max lane eob for 8 coeffs.
140 v_eobmax =
141 get_max_lane_eob(iscan, v_eobmax, vcombine_u16(v_mask_lo, v_mask_hi));
142 count -= 8;
143 } while (count);
144
145 *eob_ptr = get_max_eob(v_eobmax);
146 }
147