xref: /aosp_15_r20/external/XNNPACK/src/qu8-gavgpool/gen/7p7x-minmax-fp32-sse41-c16.c (revision 4bdc94577ba0e567308109d787f7fec7b531ce36)
1 // Auto-generated file. Do not edit!
2 //   Template: src/qs8-gavgpool/multipass-sse4.c.in
3 //   Generator: tools/xngen
4 //
5 // Copyright 2020 Google LLC
6 //
7 // This source code is licensed under the BSD-style license found in the
8 // LICENSE file in the root directory of this source tree.
9 
10 #include <assert.h>
11 
12 #include <smmintrin.h>
13 
14 #include <xnnpack/gavgpool.h>
15 #include <xnnpack/math.h>
16 #include <xnnpack/unaligned.h>
17 
18 
xnn_qu8_gavgpool_minmax_fp32_ukernel_7p7x__sse41_c16(size_t rows,size_t channels,const uint8_t * input,size_t input_stride,const uint8_t * zero,int32_t * buffer,uint8_t * output,const union xnn_qu8_avgpool_minmax_params params[restrict XNN_MIN_ELEMENTS (1)])19 void xnn_qu8_gavgpool_minmax_fp32_ukernel_7p7x__sse41_c16(
20     size_t rows,
21     size_t channels,
22     const uint8_t* input,
23     size_t input_stride,
24     const uint8_t* zero,
25     int32_t* buffer,
26     uint8_t* output,
27     const union xnn_qu8_avgpool_minmax_params params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
28 {
29   assert(rows > 7);
30   assert(channels != 0);
31 
32   const uint8_t* i0 = input;
33   const uint8_t* i1 = (const uint8_t*) ((uintptr_t) i0 + input_stride);
34   const uint8_t* i2 = (const uint8_t*) ((uintptr_t) i1 + input_stride);
35   const uint8_t* i3 = (const uint8_t*) ((uintptr_t) i2 + input_stride);
36   const uint8_t* i4 = (const uint8_t*) ((uintptr_t) i3 + input_stride);
37   const uint8_t* i5 = (const uint8_t*) ((uintptr_t) i4 + input_stride);
38   const uint8_t* i6 = (const uint8_t*) ((uintptr_t) i5 + input_stride);
39   const size_t input_increment = 7 * input_stride - round_up_po2(channels, 16) * sizeof(uint8_t);
40 
41   const __m128i vinit_bias = _mm_load_si128((const __m128i*) params->fp32_sse4.init_bias);
42   int32_t* b = buffer;
43   size_t c = channels;
44   for (; c != 0; c = doz(c, 16)) {
45     const __m128i vxi0x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i0));
46     const __m128i vxi0x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i0 + 8)));
47     i0 += 16;
48     const __m128i vxi1x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i1));
49     const __m128i vxi1x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i1 + 8)));
50     i1 += 16;
51 
52     __m128i vacc01234567 = _mm_add_epi16(vxi0x01234567, vxi1x01234567);
53     const __m128i vxi2x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i2));
54     __m128i vacc89ABCDEF = _mm_add_epi16(vxi0x89ABCDEF, vxi1x89ABCDEF);
55     const __m128i vxi2x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i2 + 8)));
56     i2 += 16;
57 
58     vacc01234567 = _mm_add_epi16(vacc01234567, vxi2x01234567);
59     const __m128i vxi3x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i3));
60     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi2x89ABCDEF);
61     const __m128i vxi3x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i3 + 8)));
62     i3 += 16;
63     vacc01234567 = _mm_add_epi16(vacc01234567, vxi3x01234567);
64     const __m128i vxi4x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i4));
65     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi3x89ABCDEF);
66     const __m128i vxi4x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i4 + 8)));
67     i4 += 16;
68     vacc01234567 = _mm_add_epi16(vacc01234567, vxi4x01234567);
69     const __m128i vxi5x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i5));
70     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi4x89ABCDEF);
71     const __m128i vxi5x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i5 + 8)));
72     i5 += 16;
73     vacc01234567 = _mm_add_epi16(vacc01234567, vxi5x01234567);
74     const __m128i vxi6x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i6));
75     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi5x89ABCDEF);
76     const __m128i vxi6x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i6 + 8)));
77     i6 += 16;
78 
79     vacc01234567 = _mm_add_epi16(vacc01234567, vxi6x01234567);
80     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi6x89ABCDEF);
81 
82     const __m128i vzero = _mm_setzero_si128();
83     __m128i vacc0123 = _mm_cvtepu16_epi32(vacc01234567);
84     __m128i vacc4567 = _mm_unpackhi_epi16(vacc01234567, vzero);
85     __m128i vacc89AB = _mm_cvtepu16_epi32(vacc89ABCDEF);
86     __m128i vaccCDEF = _mm_unpackhi_epi16(vacc89ABCDEF, vzero);
87 
88     vacc0123 = _mm_add_epi32(vacc0123, vinit_bias);
89     vacc4567 = _mm_add_epi32(vacc4567, vinit_bias);
90     vacc89AB = _mm_add_epi32(vacc89AB, vinit_bias);
91     vaccCDEF = _mm_add_epi32(vaccCDEF, vinit_bias);
92 
93     _mm_store_si128((__m128i*) b, vacc0123);
94     _mm_store_si128((__m128i*) (b + 4), vacc4567);
95     _mm_store_si128((__m128i*) (b + 8), vacc89AB);
96     _mm_store_si128((__m128i*) (b + 12), vaccCDEF);
97     b += 16;
98   }
99 
100   for (rows -= 7; rows > 7; rows -= 7) {
101     i0 = (const uint8_t*) ((uintptr_t) i0 + input_increment);
102     i1 = (const uint8_t*) ((uintptr_t) i1 + input_increment);
103     i2 = (const uint8_t*) ((uintptr_t) i2 + input_increment);
104     i3 = (const uint8_t*) ((uintptr_t) i3 + input_increment);
105     i4 = (const uint8_t*) ((uintptr_t) i4 + input_increment);
106     i5 = (const uint8_t*) ((uintptr_t) i5 + input_increment);
107     i6 = (const uint8_t*) ((uintptr_t) i6 + input_increment);
108 
109     int32_t* b = buffer;
110     size_t c = channels;
111     for (; c != 0; c = doz(c, 16)) {
112       const __m128i vxi0x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i0));
113       const __m128i vxi0x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i0 + 8)));
114       i0 += 16;
115       const __m128i vxi1x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i1));
116       const __m128i vxi1x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i1 + 8)));
117       i1 += 16;
118 
119       __m128i vacc01234567 = _mm_add_epi16(vxi0x01234567, vxi1x01234567);
120       const __m128i vxi2x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i2));
121       __m128i vacc89ABCDEF = _mm_add_epi16(vxi0x89ABCDEF, vxi1x89ABCDEF);
122       const __m128i vxi2x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i2 + 8)));
123       i2 += 16;
124 
125       vacc01234567 = _mm_add_epi16(vacc01234567, vxi2x01234567);
126       const __m128i vxi3x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i3));
127       vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi2x89ABCDEF);
128       const __m128i vxi3x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i3 + 8)));
129       i3 += 16;
130       vacc01234567 = _mm_add_epi16(vacc01234567, vxi3x01234567);
131       const __m128i vxi4x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i4));
132       vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi3x89ABCDEF);
133       const __m128i vxi4x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i4 + 8)));
134       i4 += 16;
135       vacc01234567 = _mm_add_epi16(vacc01234567, vxi4x01234567);
136       const __m128i vxi5x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i5));
137       vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi4x89ABCDEF);
138       const __m128i vxi5x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i5 + 8)));
139       i5 += 16;
140       vacc01234567 = _mm_add_epi16(vacc01234567, vxi5x01234567);
141       const __m128i vxi6x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i6));
142       vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi5x89ABCDEF);
143       const __m128i vxi6x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i6 + 8)));
144       i6 += 16;
145 
146       vacc01234567 = _mm_add_epi16(vacc01234567, vxi6x01234567);
147       vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi6x89ABCDEF);
148 
149       const __m128i vzero = _mm_setzero_si128();
150       __m128i vacc0123 = _mm_cvtepu16_epi32(vacc01234567);
151       __m128i vacc4567 = _mm_unpackhi_epi16(vacc01234567, vzero);
152       __m128i vacc89AB = _mm_cvtepu16_epi32(vacc89ABCDEF);
153       __m128i vaccCDEF = _mm_unpackhi_epi16(vacc89ABCDEF, vzero);
154 
155       vacc0123 = _mm_add_epi32(vacc0123, _mm_load_si128((const __m128i*) b));
156       vacc4567 = _mm_add_epi32(vacc4567, _mm_load_si128((const __m128i*) (b + 4)));
157       vacc89AB = _mm_add_epi32(vacc89AB, _mm_load_si128((const __m128i*) (b + 8)));
158       vaccCDEF = _mm_add_epi32(vaccCDEF, _mm_load_si128((const __m128i*) (b + 12)));
159 
160       _mm_store_si128((__m128i*) b, vacc0123);
161       _mm_store_si128((__m128i*) (b + 4), vacc4567);
162       _mm_store_si128((__m128i*) (b + 8), vacc89AB);
163       _mm_store_si128((__m128i*) (b + 12), vaccCDEF);
164       b += 16;
165     }
166   }
167 
168   i0 = (const uint8_t*) ((uintptr_t) i0 + input_increment);
169   i1 = (const uint8_t*) ((uintptr_t) i1 + input_increment);
170   if XNN_UNPREDICTABLE(rows < 2) {
171     i1 = zero;
172   }
173   i2 = (const uint8_t*) ((uintptr_t) i2 + input_increment);
174   if XNN_UNPREDICTABLE(rows <= 2) {
175     i2 = zero;
176   }
177   i3 = (const uint8_t*) ((uintptr_t) i3 + input_increment);
178   if XNN_UNPREDICTABLE(rows < 4) {
179     i3 = zero;
180   }
181   i4 = (const uint8_t*) ((uintptr_t) i4 + input_increment);
182   if XNN_UNPREDICTABLE(rows <= 4) {
183     i4 = zero;
184   }
185   i5 = (const uint8_t*) ((uintptr_t) i5 + input_increment);
186   if XNN_UNPREDICTABLE(rows < 6) {
187     i5 = zero;
188   }
189   i6 = (const uint8_t*) ((uintptr_t) i6 + input_increment);
190   if XNN_UNPREDICTABLE(rows <= 6) {
191     i6 = zero;
192   }
193 
194   const __m128 vscale = _mm_load_ps(params->fp32_sse4.scale);
195   const __m128 voutput_max_less_zero_point = _mm_load_ps(params->fp32_sse4.output_max_less_zero_point);
196   const __m128i voutput_zero_point = _mm_load_si128((const __m128i*) params->fp32_sse4.output_zero_point);
197   const __m128i voutput_min = _mm_load_si128((const __m128i*) params->fp32_sse4.output_min);
198   for (; channels >= 16; channels -= 16) {
199     const __m128i vxi0x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i0));
200     const __m128i vxi0x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i0 + 8)));
201     i0 += 16;
202     const __m128i vxi1x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i1));
203     const __m128i vxi1x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i1 + 8)));
204     i1 += 16;
205 
206     __m128i vacc01234567 = _mm_add_epi16(vxi0x01234567, vxi1x01234567);
207     const __m128i vxi2x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i2));
208     __m128i vacc89ABCDEF = _mm_add_epi16(vxi0x89ABCDEF, vxi1x89ABCDEF);
209     const __m128i vxi2x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i2 + 8)));
210     i2 += 16;
211 
212     vacc01234567 = _mm_add_epi16(vacc01234567, vxi2x01234567);
213     const __m128i vxi3x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i3));
214     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi2x89ABCDEF);
215     const __m128i vxi3x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i3 + 8)));
216     i3 += 16;
217     vacc01234567 = _mm_add_epi16(vacc01234567, vxi3x01234567);
218     const __m128i vxi4x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i4));
219     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi3x89ABCDEF);
220     const __m128i vxi4x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i4 + 8)));
221     i4 += 16;
222     vacc01234567 = _mm_add_epi16(vacc01234567, vxi4x01234567);
223     const __m128i vxi5x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i5));
224     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi4x89ABCDEF);
225     const __m128i vxi5x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i5 + 8)));
226     i5 += 16;
227     vacc01234567 = _mm_add_epi16(vacc01234567, vxi5x01234567);
228     const __m128i vxi6x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i6));
229     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi5x89ABCDEF);
230     const __m128i vxi6x89ABCDEF = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) (i6 + 8)));
231     i6 += 16;
232 
233     vacc01234567 = _mm_add_epi16(vacc01234567, vxi6x01234567);
234     vacc89ABCDEF = _mm_add_epi16(vacc89ABCDEF, vxi6x89ABCDEF);
235 
236     const __m128i vzero = _mm_setzero_si128();
237     __m128i vacc0123 = _mm_cvtepu16_epi32(vacc01234567);
238     __m128i vacc4567 = _mm_unpackhi_epi16(vacc01234567, vzero);
239     __m128i vacc89AB = _mm_cvtepu16_epi32(vacc89ABCDEF);
240     __m128i vaccCDEF = _mm_unpackhi_epi16(vacc89ABCDEF, vzero);
241 
242     vacc0123 = _mm_add_epi32(vacc0123, _mm_load_si128((const __m128i*) buffer));
243     vacc4567 = _mm_add_epi32(vacc4567, _mm_load_si128((const __m128i*) (buffer + 4)));
244     vacc89AB = _mm_add_epi32(vacc89AB, _mm_load_si128((const __m128i*) (buffer + 8)));
245     vaccCDEF = _mm_add_epi32(vaccCDEF, _mm_load_si128((const __m128i*) (buffer + 12)));
246     buffer += 16;
247 
248     __m128 vfpacc0123 = _mm_cvtepi32_ps(vacc0123);
249     __m128 vfpacc4567 = _mm_cvtepi32_ps(vacc4567);
250     __m128 vfpacc89AB = _mm_cvtepi32_ps(vacc89AB);
251     __m128 vfpaccCDEF = _mm_cvtepi32_ps(vaccCDEF);
252 
253     vfpacc0123 = _mm_mul_ps(vfpacc0123, vscale);
254     vfpacc4567 = _mm_mul_ps(vfpacc4567, vscale);
255     vfpacc89AB = _mm_mul_ps(vfpacc89AB, vscale);
256     vfpaccCDEF = _mm_mul_ps(vfpaccCDEF, vscale);
257 
258     vfpacc0123 = _mm_min_ps(vfpacc0123, voutput_max_less_zero_point);
259     vfpacc4567 = _mm_min_ps(vfpacc4567, voutput_max_less_zero_point);
260     vfpacc89AB = _mm_min_ps(vfpacc89AB, voutput_max_less_zero_point);
261     vfpaccCDEF = _mm_min_ps(vfpaccCDEF, voutput_max_less_zero_point);
262 
263     vacc0123 = _mm_cvtps_epi32(vfpacc0123);
264     vacc4567 = _mm_cvtps_epi32(vfpacc4567);
265     vacc89AB = _mm_cvtps_epi32(vfpacc89AB);
266     vaccCDEF = _mm_cvtps_epi32(vfpaccCDEF);
267 
268     __m128i vout01234567 = _mm_adds_epi16(_mm_packs_epi32(vacc0123, vacc4567), voutput_zero_point);
269     __m128i vout89ABCDEF = _mm_adds_epi16(_mm_packs_epi32(vacc89AB, vaccCDEF), voutput_zero_point);
270 
271     __m128i vout0123456789ABCDEF = _mm_packus_epi16(vout01234567, vout89ABCDEF);
272 
273     vout0123456789ABCDEF = _mm_max_epu8(vout0123456789ABCDEF, voutput_min);
274 
275     _mm_storeu_si128((__m128i*) output, vout0123456789ABCDEF);
276     output += 16;
277   }
278   if XNN_UNLIKELY(channels != 0) {
279     do {
280       const __m128i vxi0x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i0));
281       i0 += 8;
282       const __m128i vxi1x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i1));
283       i1 += 8;
284 
285       __m128i vacc01234567 = _mm_add_epi16(vxi0x01234567, vxi1x01234567);
286       const __m128i vxi2x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i2));
287       i2 += 8;
288 
289       vacc01234567 = _mm_add_epi16(vacc01234567, vxi2x01234567);
290       const __m128i vxi3x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i3));
291       i3 += 8;
292       vacc01234567 = _mm_add_epi16(vacc01234567, vxi3x01234567);
293       const __m128i vxi4x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i4));
294       i4 += 8;
295       vacc01234567 = _mm_add_epi16(vacc01234567, vxi4x01234567);
296       const __m128i vxi5x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i5));
297       i5 += 8;
298       vacc01234567 = _mm_add_epi16(vacc01234567, vxi5x01234567);
299       const __m128i vxi6x01234567 = _mm_cvtepu8_epi16(_mm_loadl_epi64((const __m128i*) i6));
300       i6 += 8;
301 
302       vacc01234567 = _mm_add_epi16(vacc01234567, vxi6x01234567);
303 
304       __m128i vacc0123 = _mm_cvtepu16_epi32(vacc01234567);
305       __m128i vacc4567 = _mm_unpackhi_epi16(vacc01234567, _mm_setzero_si128());
306 
307       vacc0123 = _mm_add_epi32(vacc0123, _mm_load_si128((const __m128i*) buffer));
308       vacc4567 = _mm_add_epi32(vacc4567, _mm_load_si128((const __m128i*) (buffer + 4)));
309       buffer += 8;
310 
311       __m128 vfpacc0123 = _mm_cvtepi32_ps(vacc0123);
312       __m128 vfpacc4567 = _mm_cvtepi32_ps(vacc4567);
313 
314       vfpacc0123 = _mm_mul_ps(vfpacc0123, vscale);
315       vfpacc4567 = _mm_mul_ps(vfpacc4567, vscale);
316 
317       vfpacc0123 = _mm_min_ps(vfpacc0123, voutput_max_less_zero_point);
318       vfpacc4567 = _mm_min_ps(vfpacc4567, voutput_max_less_zero_point);
319 
320       vacc0123 = _mm_cvtps_epi32(vfpacc0123);
321       vacc4567 = _mm_cvtps_epi32(vfpacc4567);
322 
323       __m128i vout01234567 = _mm_adds_epi16(_mm_packs_epi32(vacc0123, vacc4567), voutput_zero_point);
324 
325       __m128i vout0123456701234567 = _mm_packus_epi16(vout01234567, vout01234567);
326       vout0123456701234567 = _mm_max_epu8(vout0123456701234567, voutput_min);
327 
328       if XNN_LIKELY(channels >= 8) {
329         _mm_storel_epi64((__m128i*) output, vout0123456701234567);
330         output += 8;
331         channels -= 8;
332       } else {
333         if (channels & 4) {
334           unaligned_store_u32(output, (uint32_t) _mm_cvtsi128_si32(vout0123456701234567));
335           vout0123456701234567 = _mm_srli_epi64(vout0123456701234567, 32);
336           output += 4;
337         }
338         if (channels & 2) {
339           unaligned_store_u16(output, (uint16_t) _mm_extract_epi16(vout0123456701234567, 0));
340           vout0123456701234567 = _mm_srli_epi32(vout0123456701234567, 16);
341           output += 2;
342         }
343         if (channels & 1) {
344           *output = (uint8_t) _mm_extract_epi8(vout0123456701234567, 0);
345           output += 1;
346         }
347         channels = 0;
348       }
349     } while (channels != 0);
350   }
351 }
352