1 /*
2 * Copyright (c) 2014 The WebRTC 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 "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
12
13 #include <arm_neon.h>
14
DotProductWithScaleNeon(int32_t * cross_correlation,const int16_t * vector1,const int16_t * vector2,size_t length,int scaling)15 static inline void DotProductWithScaleNeon(int32_t* cross_correlation,
16 const int16_t* vector1,
17 const int16_t* vector2,
18 size_t length,
19 int scaling) {
20 size_t i = 0;
21 size_t len1 = length >> 3;
22 size_t len2 = length & 7;
23 int64x2_t sum0 = vdupq_n_s64(0);
24 int64x2_t sum1 = vdupq_n_s64(0);
25
26 for (i = len1; i > 0; i -= 1) {
27 int16x8_t seq1_16x8 = vld1q_s16(vector1);
28 int16x8_t seq2_16x8 = vld1q_s16(vector2);
29 #if defined(WEBRTC_ARCH_ARM64)
30 int32x4_t tmp0 = vmull_s16(vget_low_s16(seq1_16x8),
31 vget_low_s16(seq2_16x8));
32 int32x4_t tmp1 = vmull_high_s16(seq1_16x8, seq2_16x8);
33 #else
34 int32x4_t tmp0 = vmull_s16(vget_low_s16(seq1_16x8),
35 vget_low_s16(seq2_16x8));
36 int32x4_t tmp1 = vmull_s16(vget_high_s16(seq1_16x8),
37 vget_high_s16(seq2_16x8));
38 #endif
39 sum0 = vpadalq_s32(sum0, tmp0);
40 sum1 = vpadalq_s32(sum1, tmp1);
41 vector1 += 8;
42 vector2 += 8;
43 }
44
45 // Calculate the rest of the samples.
46 int64_t sum_res = 0;
47 for (i = len2; i > 0; i -= 1) {
48 sum_res += WEBRTC_SPL_MUL_16_16(*vector1, *vector2);
49 vector1++;
50 vector2++;
51 }
52
53 sum0 = vaddq_s64(sum0, sum1);
54 #if defined(WEBRTC_ARCH_ARM64)
55 int64_t sum2 = vaddvq_s64(sum0);
56 *cross_correlation = (int32_t)((sum2 + sum_res) >> scaling);
57 #else
58 int64x1_t shift = vdup_n_s64(-scaling);
59 int64x1_t sum2 = vadd_s64(vget_low_s64(sum0), vget_high_s64(sum0));
60 sum2 = vadd_s64(sum2, vdup_n_s64(sum_res));
61 sum2 = vshl_s64(sum2, shift);
62 vst1_lane_s32(cross_correlation, vreinterpret_s32_s64(sum2), 0);
63 #endif
64 }
65
66 /* NEON version of WebRtcSpl_CrossCorrelation() for ARM32/64 platforms. */
WebRtcSpl_CrossCorrelationNeon(int32_t * cross_correlation,const int16_t * seq1,const int16_t * seq2,size_t dim_seq,size_t dim_cross_correlation,int right_shifts,int step_seq2)67 void WebRtcSpl_CrossCorrelationNeon(int32_t* cross_correlation,
68 const int16_t* seq1,
69 const int16_t* seq2,
70 size_t dim_seq,
71 size_t dim_cross_correlation,
72 int right_shifts,
73 int step_seq2) {
74 size_t i = 0;
75
76 for (i = 0; i < dim_cross_correlation; i++) {
77 const int16_t* seq1_ptr = seq1;
78 const int16_t* seq2_ptr = seq2 + (step_seq2 * i);
79
80 DotProductWithScaleNeon(cross_correlation,
81 seq1_ptr,
82 seq2_ptr,
83 dim_seq,
84 right_shifts);
85 cross_correlation++;
86 }
87 }
88