1 /******************************************************************************
2 *
3 * Copyright 2022 Google LLC
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18
19 #if __ARM_NEON && __ARM_ARCH_ISA_A64
20
21 #ifndef TEST_NEON
22 #include <arm_neon.h>
23 #endif /* TEST_NEON */
24
25
26 /**
27 * Import
28 */
29
30 static inline int32_t filter_hp50(struct lc3_ltpf_hp50_state *, int32_t);
31
32
33 /**
34 * Resample from 16 Khz to 12.8 KHz
35 */
36 #ifndef resample_16k_12k8
37 #define resample_16k_12k8 neon_resample_16k_12k8
neon_resample_16k_12k8(struct lc3_ltpf_hp50_state * hp50,const int16_t * x,int16_t * y,int n)38 LC3_HOT static void neon_resample_16k_12k8(
39 struct lc3_ltpf_hp50_state *hp50, const int16_t *x, int16_t *y, int n)
40 {
41 static const int16_t h[4][20] = {
42
43 { -61, 214, -398, 417, 0, -1052, 2686, -4529, 5997, 26233,
44 5997, -4529, 2686, -1052, 0, 417, -398, 214, -61, 0 },
45
46 { -79, 180, -213, 0, 598, -1522, 2389, -2427, 0, 24506,
47 13068, -5289, 1873, 0, -752, 763, -457, 156, 0, -28 },
48
49 { -61, 92, 0, -323, 861, -1361, 1317, 0, -3885, 19741,
50 19741, -3885, 0, 1317, -1361, 861, -323, 0, 92, -61 },
51
52 { -28, 0, 156, -457, 763, -752, 0, 1873, -5289, 13068,
53 24506, 0, -2427, 2389, -1522, 598, 0, -213, 180, -79 },
54
55 };
56
57 x -= 20 - 1;
58
59 for (int i = 0; i < 5*n; i += 5) {
60 const int16_t *hn = h[i & 3];
61 const int16_t *xn = x + (i >> 2);
62 int32x4_t un;
63
64 un = vmull_s16( vld1_s16(xn), vld1_s16(hn)), xn += 4, hn += 4;
65 un = vmlal_s16(un, vld1_s16(xn), vld1_s16(hn)), xn += 4, hn += 4;
66 un = vmlal_s16(un, vld1_s16(xn), vld1_s16(hn)), xn += 4, hn += 4;
67 un = vmlal_s16(un, vld1_s16(xn), vld1_s16(hn)), xn += 4, hn += 4;
68 un = vmlal_s16(un, vld1_s16(xn), vld1_s16(hn)), xn += 4, hn += 4;
69
70 int32_t yn = filter_hp50(hp50, vaddvq_s32(un));
71 *(y++) = (yn + (1 << 15)) >> 16;
72 }
73 }
74 #endif /* resample_16k_12k8 */
75
76 /**
77 * Resample from 32 Khz to 12.8 KHz
78 */
79 #ifndef resample_32k_12k8
80 #define resample_32k_12k8 neon_resample_32k_12k8
neon_resample_32k_12k8(struct lc3_ltpf_hp50_state * hp50,const int16_t * x,int16_t * y,int n)81 LC3_HOT static void neon_resample_32k_12k8(
82 struct lc3_ltpf_hp50_state *hp50, const int16_t *x, int16_t *y, int n)
83 {
84 x -= 40 - 1;
85
86 static const int16_t h[2][40] = {
87
88 { -30, -31, 46, 107, 0, -199, -162, 209, 430, 0,
89 -681, -526, 658, 1343, 0, -2264, -1943, 2999, 9871, 13116,
90 9871, 2999, -1943, -2264, 0, 1343, 658, -526, -681, 0,
91 430, 209, -162, -199, 0, 107, 46, -31, -30, 0 },
92
93 { -14, -39, 0, 90, 78, -106, -229, 0, 382, 299,
94 -376, -761, 0, 1194, 937, -1214, -2644, 0, 6534, 12253,
95 12253, 6534, 0, -2644, -1214, 937, 1194, 0, -761, -376,
96 299, 382, 0, -229, -106, 78, 90, 0, -39, -14 },
97
98 };
99
100 for (int i = 0; i < 5*n; i += 5) {
101 const int16_t *hn = h[i & 1];
102 const int16_t *xn = x + (i >> 1);
103
104 int32x4_t un = vmull_s16(vld1_s16(xn), vld1_s16(hn));
105 xn += 4, hn += 4;
106
107 for (int i = 1; i < 10; i++)
108 un = vmlal_s16(un, vld1_s16(xn), vld1_s16(hn)), xn += 4, hn += 4;
109
110 int32_t yn = filter_hp50(hp50, vaddvq_s32(un));
111 *(y++) = (yn + (1 << 15)) >> 16;
112 }
113 }
114 #endif /* resample_32k_12k8 */
115
116 /**
117 * Resample from 48 Khz to 12.8 KHz
118 */
119 #ifndef resample_48k_12k8
120 #define resample_48k_12k8 neon_resample_48k_12k8
neon_resample_48k_12k8(struct lc3_ltpf_hp50_state * hp50,const int16_t * x,int16_t * y,int n)121 LC3_HOT static void neon_resample_48k_12k8(
122 struct lc3_ltpf_hp50_state *hp50, const int16_t *x, int16_t *y, int n)
123 {
124 static const int16_t alignas(16) h[4][64] = {
125
126 { -13, -25, -20, 10, 51, 71, 38, -47, -133, -145,
127 -42, 139, 277, 242, 0, -329, -511, -351, 144, 698,
128 895, 450, -535, -1510, -1697, -521, 1999, 5138, 7737, 8744,
129 7737, 5138, 1999, -521, -1697, -1510, -535, 450, 895, 698,
130 144, -351, -511, -329, 0, 242, 277, 139, -42, -145,
131 -133, -47, 38, 71, 51, 10, -20, -25, -13, 0 },
132
133 { -9, -23, -24, 0, 41, 71, 52, -23, -115, -152,
134 -78, 92, 254, 272, 76, -251, -493, -427, 0, 576,
135 900, 624, -262, -1309, -1763, -954, 1272, 4356, 7203, 8679,
136 8169, 5886, 2767, 0, -1542, -1660, -809, 240, 848, 796,
137 292, -252, -507, -398, -82, 199, 288, 183, 0, -130,
138 -145, -71, 20, 69, 60, 20, -15, -26, -17, -3 },
139
140 { -6, -20, -26, -8, 31, 67, 62, 0, -94, -152,
141 -108, 45, 223, 287, 143, -167, -454, -480, -134, 439,
142 866, 758, 0, -1071, -1748, -1295, 601, 3559, 6580, 8485,
143 8485, 6580, 3559, 601, -1295, -1748, -1071, 0, 758, 866,
144 439, -134, -480, -454, -167, 143, 287, 223, 45, -108,
145 -152, -94, 0, 62, 67, 31, -8, -26, -20, -6 },
146
147 { -3, -17, -26, -15, 20, 60, 69, 20, -71, -145,
148 -130, 0, 183, 288, 199, -82, -398, -507, -252, 292,
149 796, 848, 240, -809, -1660, -1542, 0, 2767, 5886, 8169,
150 8679, 7203, 4356, 1272, -954, -1763, -1309, -262, 624, 900,
151 576, 0, -427, -493, -251, 76, 272, 254, 92, -78,
152 -152, -115, -23, 52, 71, 41, 0, -24, -23, -9 },
153
154 };
155
156 x -= 60 - 1;
157
158 for (int i = 0; i < 15*n; i += 15) {
159 const int16_t *hn = h[i & 3];
160 const int16_t *xn = x + (i >> 2);
161
162 int32x4_t un = vmull_s16(vld1_s16(xn), vld1_s16(hn));
163 xn += 4, hn += 4;
164
165 for (int i = 1; i < 15; i++)
166 un = vmlal_s16(un, vld1_s16(xn), vld1_s16(hn)), xn += 4, hn += 4;
167
168 int32_t yn = filter_hp50(hp50, vaddvq_s32(un));
169 *(y++) = (yn + (1 << 15)) >> 16;
170 }
171 }
172 #endif /* resample_48k_12k8 */
173
174 /**
175 * Return dot product of 2 vectors
176 */
177 #ifndef dot
178 #define dot neon_dot
neon_dot(const int16_t * a,const int16_t * b,int n)179 LC3_HOT static inline float neon_dot(const int16_t *a, const int16_t *b, int n)
180 {
181 int64x2_t v = vmovq_n_s64(0);
182
183 for (int i = 0; i < (n >> 4); i++) {
184 int32x4_t u;
185
186 u = vmull_s16( vld1_s16(a), vld1_s16(b)), a += 4, b += 4;
187 u = vmlal_s16(u, vld1_s16(a), vld1_s16(b)), a += 4, b += 4;
188 v = vpadalq_s32(v, u);
189
190 u = vmull_s16( vld1_s16(a), vld1_s16(b)), a += 4, b += 4;
191 u = vmlal_s16(u, vld1_s16(a), vld1_s16(b)), a += 4, b += 4;
192 v = vpadalq_s32(v, u);
193 }
194
195 int32_t v32 = (vaddvq_s64(v) + (1 << 5)) >> 6;
196 return (float)v32;
197 }
198 #endif /* dot */
199
200 /**
201 * Return vector of correlations
202 */
203 #ifndef correlate
204 #define correlate neon_correlate
neon_correlate(const int16_t * a,const int16_t * b,int n,float * y,int nc)205 LC3_HOT static void neon_correlate(
206 const int16_t *a, const int16_t *b, int n, float *y, int nc)
207 {
208 for ( ; nc >= 4; nc -= 4, b -= 4) {
209 const int16_t *an = (const int16_t *)a;
210 const int16_t *bn = (const int16_t *)b;
211
212 int64x2_t v0 = vmovq_n_s64(0), v1 = v0, v2 = v0, v3 = v0;
213 int16x4_t ax, b0, b1;
214
215 b0 = vld1_s16(bn-4);
216
217 for (int i=0; i < (n >> 4); i++ )
218 for (int j = 0; j < 2; j++) {
219 int32x4_t u0, u1, u2, u3;
220
221 b1 = b0;
222 b0 = vld1_s16(bn), bn += 4;
223 ax = vld1_s16(an), an += 4;
224
225 u0 = vmull_s16(ax, b0);
226 u1 = vmull_s16(ax, vext_s16(b1, b0, 3));
227 u2 = vmull_s16(ax, vext_s16(b1, b0, 2));
228 u3 = vmull_s16(ax, vext_s16(b1, b0, 1));
229
230 b1 = b0;
231 b0 = vld1_s16(bn), bn += 4;
232 ax = vld1_s16(an), an += 4;
233
234 u0 = vmlal_s16(u0, ax, b0);
235 u1 = vmlal_s16(u1, ax, vext_s16(b1, b0, 3));
236 u2 = vmlal_s16(u2, ax, vext_s16(b1, b0, 2));
237 u3 = vmlal_s16(u3, ax, vext_s16(b1, b0, 1));
238
239 v0 = vpadalq_s32(v0, u0);
240 v1 = vpadalq_s32(v1, u1);
241 v2 = vpadalq_s32(v2, u2);
242 v3 = vpadalq_s32(v3, u3);
243 }
244
245 *(y++) = (float)((int32_t)((vaddvq_s64(v0) + (1 << 5)) >> 6));
246 *(y++) = (float)((int32_t)((vaddvq_s64(v1) + (1 << 5)) >> 6));
247 *(y++) = (float)((int32_t)((vaddvq_s64(v2) + (1 << 5)) >> 6));
248 *(y++) = (float)((int32_t)((vaddvq_s64(v3) + (1 << 5)) >> 6));
249 }
250
251 for ( ; nc > 0; nc--)
252 *(y++) = neon_dot(a, b--, n);
253 }
254 #endif /* correlate */
255
256 #endif /* __ARM_NEON && __ARM_ARCH_ISA_A64 */
257