1 /*
2 * Copyright (c) 2014 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <arm_neon.h>
12
13 #include <math.h>
14
15 #include "vpx_mem/vpx_mem.h"
16
17 #include "vp9/common/vp9_quant_common.h"
18 #include "vp9/common/vp9_seg_common.h"
19
20 #include "vp9/encoder/vp9_encoder.h"
21 #include "vp9/encoder/vp9_quantize.h"
22 #include "vp9/encoder/vp9_rd.h"
23
vp9_quantize_fp_neon(const int16_t * coeff_ptr,intptr_t count,int skip_block,const int16_t * zbin_ptr,const int16_t * round_ptr,const int16_t * quant_ptr,const int16_t * quant_shift_ptr,int16_t * qcoeff_ptr,int16_t * dqcoeff_ptr,const int16_t * dequant_ptr,int zbin_oq_value,uint16_t * eob_ptr,const int16_t * scan,const int16_t * iscan)24 void vp9_quantize_fp_neon(const int16_t *coeff_ptr, intptr_t count,
25 int skip_block, const int16_t *zbin_ptr,
26 const int16_t *round_ptr, const int16_t *quant_ptr,
27 const int16_t *quant_shift_ptr, int16_t *qcoeff_ptr,
28 int16_t *dqcoeff_ptr, const int16_t *dequant_ptr,
29 int zbin_oq_value, uint16_t *eob_ptr,
30 const int16_t *scan, const int16_t *iscan) {
31 int i;
32 // TODO(jingning) Decide the need of these arguments after the
33 // quantization process is completed.
34 (void)zbin_ptr;
35 (void)quant_shift_ptr;
36 (void)zbin_oq_value;
37 (void)scan;
38
39 if (!skip_block) {
40 // Quantization pass: All coefficients with index >= zero_flag are
41 // skippable. Note: zero_flag can be zero.
42
43 const int16x8_t v_zero = vdupq_n_s16(0);
44 const int16x8_t v_one = vdupq_n_s16(1);
45 int16x8_t v_eobmax_76543210 = vdupq_n_s16(-1);
46 int16x8_t v_round = vmovq_n_s16(round_ptr[1]);
47 int16x8_t v_quant = vmovq_n_s16(quant_ptr[1]);
48 int16x8_t v_dequant = vmovq_n_s16(dequant_ptr[1]);
49 // adjust for dc
50 v_round = vsetq_lane_s16(round_ptr[0], v_round, 0);
51 v_quant = vsetq_lane_s16(quant_ptr[0], v_quant, 0);
52 v_dequant = vsetq_lane_s16(dequant_ptr[0], v_dequant, 0);
53
54 for (i = 0; i < count; i += 8) {
55 const int16x8_t v_iscan = vld1q_s16(&iscan[i]);
56 const int16x8_t v_coeff = vld1q_s16(&coeff_ptr[i]);
57 const int16x8_t v_coeff_sign = vshrq_n_s16(v_coeff, 15);
58 const int16x8_t v_abs_coeff = vabsq_s16(v_coeff);
59 const int16x8_t v_tmp = vqaddq_s16(v_abs_coeff, v_round);
60 const int32x4_t v_tmp_lo = vmull_s16(vget_low_s16(v_tmp),
61 vget_low_s16(v_quant));
62 const int32x4_t v_tmp_hi = vmull_s16(vget_high_s16(v_tmp),
63 vget_high_s16(v_quant));
64 const int16x8_t v_tmp2 = vcombine_s16(vshrn_n_s32(v_tmp_lo, 16),
65 vshrn_n_s32(v_tmp_hi, 16));
66 const uint16x8_t v_nz_mask = vceqq_s16(v_tmp2, v_zero);
67 const int16x8_t v_iscan_plus1 = vaddq_s16(v_iscan, v_one);
68 const int16x8_t v_nz_iscan =
69 vandq_s16(vmvnq_s16(vreinterpretq_s16_u16(v_nz_mask)), v_iscan_plus1);
70 const int16x8_t v_qcoeff_a = veorq_s16(v_tmp2, v_coeff_sign);
71 const int16x8_t v_qcoeff = vsubq_s16(v_qcoeff_a, v_coeff_sign);
72 const int16x8_t v_dqcoeff = vmulq_s16(v_qcoeff, v_dequant);
73
74 v_eobmax_76543210 = vmaxq_s16(v_eobmax_76543210, v_nz_iscan);
75
76 vst1q_s16(&qcoeff_ptr[i], v_qcoeff);
77 vst1q_s16(&dqcoeff_ptr[i], v_dqcoeff);
78 v_round = vmovq_n_s16(round_ptr[1]);
79 v_quant = vmovq_n_s16(quant_ptr[1]);
80 v_dequant = vmovq_n_s16(dequant_ptr[1]);
81 }
82 {
83 const int16x4_t v_eobmax_3210 =
84 vmax_s16(vget_low_s16(v_eobmax_76543210),
85 vget_high_s16(v_eobmax_76543210));
86 const int64x1_t v_eobmax_xx32 =
87 vshr_n_s64(vreinterpret_s64_s16(v_eobmax_3210), 32);
88 const int16x4_t v_eobmax_tmp =
89 vmax_s16(v_eobmax_3210, vreinterpret_s16_s64(v_eobmax_xx32));
90 const int64x1_t v_eobmax_xxx3 =
91 vshr_n_s64(vreinterpret_s64_s16(v_eobmax_tmp), 16);
92 const int16x4_t v_eobmax_final =
93 vmax_s16(v_eobmax_tmp, vreinterpret_s16_s64(v_eobmax_xxx3));
94
95 *eob_ptr = (uint16_t)vget_lane_s16(v_eobmax_final, 0);
96 }
97 } else {
98 vpx_memset(qcoeff_ptr, 0, count * sizeof(int16_t));
99 vpx_memset(dqcoeff_ptr, 0, count * sizeof(int16_t));
100 *eob_ptr = 0;
101 }
102 }
103