1 /*
2 * Copyright (c) 2011 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/modules/audio_processing/aec/aec_rdft.h"
12
13 #include <emmintrin.h>
14
15 static const ALIGN16_BEG float ALIGN16_END
16 k_swap_sign[4] = {-1.f, 1.f, -1.f, 1.f};
17
cft1st_128_SSE2(float * a)18 static void cft1st_128_SSE2(float* a) {
19 const __m128 mm_swap_sign = _mm_load_ps(k_swap_sign);
20 int j, k2;
21
22 for (k2 = 0, j = 0; j < 128; j += 16, k2 += 4) {
23 __m128 a00v = _mm_loadu_ps(&a[j + 0]);
24 __m128 a04v = _mm_loadu_ps(&a[j + 4]);
25 __m128 a08v = _mm_loadu_ps(&a[j + 8]);
26 __m128 a12v = _mm_loadu_ps(&a[j + 12]);
27 __m128 a01v = _mm_shuffle_ps(a00v, a08v, _MM_SHUFFLE(1, 0, 1, 0));
28 __m128 a23v = _mm_shuffle_ps(a00v, a08v, _MM_SHUFFLE(3, 2, 3, 2));
29 __m128 a45v = _mm_shuffle_ps(a04v, a12v, _MM_SHUFFLE(1, 0, 1, 0));
30 __m128 a67v = _mm_shuffle_ps(a04v, a12v, _MM_SHUFFLE(3, 2, 3, 2));
31
32 const __m128 wk1rv = _mm_load_ps(&rdft_wk1r[k2]);
33 const __m128 wk1iv = _mm_load_ps(&rdft_wk1i[k2]);
34 const __m128 wk2rv = _mm_load_ps(&rdft_wk2r[k2]);
35 const __m128 wk2iv = _mm_load_ps(&rdft_wk2i[k2]);
36 const __m128 wk3rv = _mm_load_ps(&rdft_wk3r[k2]);
37 const __m128 wk3iv = _mm_load_ps(&rdft_wk3i[k2]);
38 __m128 x0v = _mm_add_ps(a01v, a23v);
39 const __m128 x1v = _mm_sub_ps(a01v, a23v);
40 const __m128 x2v = _mm_add_ps(a45v, a67v);
41 const __m128 x3v = _mm_sub_ps(a45v, a67v);
42 __m128 x0w;
43 a01v = _mm_add_ps(x0v, x2v);
44 x0v = _mm_sub_ps(x0v, x2v);
45 x0w = _mm_shuffle_ps(x0v, x0v, _MM_SHUFFLE(2, 3, 0, 1));
46 {
47 const __m128 a45_0v = _mm_mul_ps(wk2rv, x0v);
48 const __m128 a45_1v = _mm_mul_ps(wk2iv, x0w);
49 a45v = _mm_add_ps(a45_0v, a45_1v);
50 }
51 {
52 __m128 a23_0v, a23_1v;
53 const __m128 x3w = _mm_shuffle_ps(x3v, x3v, _MM_SHUFFLE(2, 3, 0, 1));
54 const __m128 x3s = _mm_mul_ps(mm_swap_sign, x3w);
55 x0v = _mm_add_ps(x1v, x3s);
56 x0w = _mm_shuffle_ps(x0v, x0v, _MM_SHUFFLE(2, 3, 0, 1));
57 a23_0v = _mm_mul_ps(wk1rv, x0v);
58 a23_1v = _mm_mul_ps(wk1iv, x0w);
59 a23v = _mm_add_ps(a23_0v, a23_1v);
60
61 x0v = _mm_sub_ps(x1v, x3s);
62 x0w = _mm_shuffle_ps(x0v, x0v, _MM_SHUFFLE(2, 3, 0, 1));
63 }
64 {
65 const __m128 a67_0v = _mm_mul_ps(wk3rv, x0v);
66 const __m128 a67_1v = _mm_mul_ps(wk3iv, x0w);
67 a67v = _mm_add_ps(a67_0v, a67_1v);
68 }
69
70 a00v = _mm_shuffle_ps(a01v, a23v, _MM_SHUFFLE(1, 0, 1, 0));
71 a04v = _mm_shuffle_ps(a45v, a67v, _MM_SHUFFLE(1, 0, 1, 0));
72 a08v = _mm_shuffle_ps(a01v, a23v, _MM_SHUFFLE(3, 2, 3, 2));
73 a12v = _mm_shuffle_ps(a45v, a67v, _MM_SHUFFLE(3, 2, 3, 2));
74 _mm_storeu_ps(&a[j + 0], a00v);
75 _mm_storeu_ps(&a[j + 4], a04v);
76 _mm_storeu_ps(&a[j + 8], a08v);
77 _mm_storeu_ps(&a[j + 12], a12v);
78 }
79 }
80
cftmdl_128_SSE2(float * a)81 static void cftmdl_128_SSE2(float* a) {
82 const int l = 8;
83 const __m128 mm_swap_sign = _mm_load_ps(k_swap_sign);
84 int j0;
85
86 __m128 wk1rv = _mm_load_ps(cftmdl_wk1r);
87 for (j0 = 0; j0 < l; j0 += 2) {
88 const __m128i a_00 = _mm_loadl_epi64((__m128i*)&a[j0 + 0]);
89 const __m128i a_08 = _mm_loadl_epi64((__m128i*)&a[j0 + 8]);
90 const __m128i a_32 = _mm_loadl_epi64((__m128i*)&a[j0 + 32]);
91 const __m128i a_40 = _mm_loadl_epi64((__m128i*)&a[j0 + 40]);
92 const __m128 a_00_32 = _mm_shuffle_ps(_mm_castsi128_ps(a_00),
93 _mm_castsi128_ps(a_32),
94 _MM_SHUFFLE(1, 0, 1, 0));
95 const __m128 a_08_40 = _mm_shuffle_ps(_mm_castsi128_ps(a_08),
96 _mm_castsi128_ps(a_40),
97 _MM_SHUFFLE(1, 0, 1, 0));
98 __m128 x0r0_0i0_0r1_x0i1 = _mm_add_ps(a_00_32, a_08_40);
99 const __m128 x1r0_1i0_1r1_x1i1 = _mm_sub_ps(a_00_32, a_08_40);
100
101 const __m128i a_16 = _mm_loadl_epi64((__m128i*)&a[j0 + 16]);
102 const __m128i a_24 = _mm_loadl_epi64((__m128i*)&a[j0 + 24]);
103 const __m128i a_48 = _mm_loadl_epi64((__m128i*)&a[j0 + 48]);
104 const __m128i a_56 = _mm_loadl_epi64((__m128i*)&a[j0 + 56]);
105 const __m128 a_16_48 = _mm_shuffle_ps(_mm_castsi128_ps(a_16),
106 _mm_castsi128_ps(a_48),
107 _MM_SHUFFLE(1, 0, 1, 0));
108 const __m128 a_24_56 = _mm_shuffle_ps(_mm_castsi128_ps(a_24),
109 _mm_castsi128_ps(a_56),
110 _MM_SHUFFLE(1, 0, 1, 0));
111 const __m128 x2r0_2i0_2r1_x2i1 = _mm_add_ps(a_16_48, a_24_56);
112 const __m128 x3r0_3i0_3r1_x3i1 = _mm_sub_ps(a_16_48, a_24_56);
113
114 const __m128 xx0 = _mm_add_ps(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
115 const __m128 xx1 = _mm_sub_ps(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
116
117 const __m128 x3i0_3r0_3i1_x3r1 = _mm_castsi128_ps(_mm_shuffle_epi32(
118 _mm_castps_si128(x3r0_3i0_3r1_x3i1), _MM_SHUFFLE(2, 3, 0, 1)));
119 const __m128 x3_swapped = _mm_mul_ps(mm_swap_sign, x3i0_3r0_3i1_x3r1);
120 const __m128 x1_x3_add = _mm_add_ps(x1r0_1i0_1r1_x1i1, x3_swapped);
121 const __m128 x1_x3_sub = _mm_sub_ps(x1r0_1i0_1r1_x1i1, x3_swapped);
122
123 const __m128 yy0 =
124 _mm_shuffle_ps(x1_x3_add, x1_x3_sub, _MM_SHUFFLE(2, 2, 2, 2));
125 const __m128 yy1 =
126 _mm_shuffle_ps(x1_x3_add, x1_x3_sub, _MM_SHUFFLE(3, 3, 3, 3));
127 const __m128 yy2 = _mm_mul_ps(mm_swap_sign, yy1);
128 const __m128 yy3 = _mm_add_ps(yy0, yy2);
129 const __m128 yy4 = _mm_mul_ps(wk1rv, yy3);
130
131 _mm_storel_epi64((__m128i*)&a[j0 + 0], _mm_castps_si128(xx0));
132 _mm_storel_epi64(
133 (__m128i*)&a[j0 + 32],
134 _mm_shuffle_epi32(_mm_castps_si128(xx0), _MM_SHUFFLE(3, 2, 3, 2)));
135
136 _mm_storel_epi64((__m128i*)&a[j0 + 16], _mm_castps_si128(xx1));
137 _mm_storel_epi64(
138 (__m128i*)&a[j0 + 48],
139 _mm_shuffle_epi32(_mm_castps_si128(xx1), _MM_SHUFFLE(2, 3, 2, 3)));
140 a[j0 + 48] = -a[j0 + 48];
141
142 _mm_storel_epi64((__m128i*)&a[j0 + 8], _mm_castps_si128(x1_x3_add));
143 _mm_storel_epi64((__m128i*)&a[j0 + 24], _mm_castps_si128(x1_x3_sub));
144
145 _mm_storel_epi64((__m128i*)&a[j0 + 40], _mm_castps_si128(yy4));
146 _mm_storel_epi64(
147 (__m128i*)&a[j0 + 56],
148 _mm_shuffle_epi32(_mm_castps_si128(yy4), _MM_SHUFFLE(2, 3, 2, 3)));
149 }
150
151 {
152 int k = 64;
153 int k1 = 2;
154 int k2 = 2 * k1;
155 const __m128 wk2rv = _mm_load_ps(&rdft_wk2r[k2 + 0]);
156 const __m128 wk2iv = _mm_load_ps(&rdft_wk2i[k2 + 0]);
157 const __m128 wk1iv = _mm_load_ps(&rdft_wk1i[k2 + 0]);
158 const __m128 wk3rv = _mm_load_ps(&rdft_wk3r[k2 + 0]);
159 const __m128 wk3iv = _mm_load_ps(&rdft_wk3i[k2 + 0]);
160 wk1rv = _mm_load_ps(&rdft_wk1r[k2 + 0]);
161 for (j0 = k; j0 < l + k; j0 += 2) {
162 const __m128i a_00 = _mm_loadl_epi64((__m128i*)&a[j0 + 0]);
163 const __m128i a_08 = _mm_loadl_epi64((__m128i*)&a[j0 + 8]);
164 const __m128i a_32 = _mm_loadl_epi64((__m128i*)&a[j0 + 32]);
165 const __m128i a_40 = _mm_loadl_epi64((__m128i*)&a[j0 + 40]);
166 const __m128 a_00_32 = _mm_shuffle_ps(_mm_castsi128_ps(a_00),
167 _mm_castsi128_ps(a_32),
168 _MM_SHUFFLE(1, 0, 1, 0));
169 const __m128 a_08_40 = _mm_shuffle_ps(_mm_castsi128_ps(a_08),
170 _mm_castsi128_ps(a_40),
171 _MM_SHUFFLE(1, 0, 1, 0));
172 __m128 x0r0_0i0_0r1_x0i1 = _mm_add_ps(a_00_32, a_08_40);
173 const __m128 x1r0_1i0_1r1_x1i1 = _mm_sub_ps(a_00_32, a_08_40);
174
175 const __m128i a_16 = _mm_loadl_epi64((__m128i*)&a[j0 + 16]);
176 const __m128i a_24 = _mm_loadl_epi64((__m128i*)&a[j0 + 24]);
177 const __m128i a_48 = _mm_loadl_epi64((__m128i*)&a[j0 + 48]);
178 const __m128i a_56 = _mm_loadl_epi64((__m128i*)&a[j0 + 56]);
179 const __m128 a_16_48 = _mm_shuffle_ps(_mm_castsi128_ps(a_16),
180 _mm_castsi128_ps(a_48),
181 _MM_SHUFFLE(1, 0, 1, 0));
182 const __m128 a_24_56 = _mm_shuffle_ps(_mm_castsi128_ps(a_24),
183 _mm_castsi128_ps(a_56),
184 _MM_SHUFFLE(1, 0, 1, 0));
185 const __m128 x2r0_2i0_2r1_x2i1 = _mm_add_ps(a_16_48, a_24_56);
186 const __m128 x3r0_3i0_3r1_x3i1 = _mm_sub_ps(a_16_48, a_24_56);
187
188 const __m128 xx = _mm_add_ps(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
189 const __m128 xx1 = _mm_sub_ps(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
190 const __m128 xx2 = _mm_mul_ps(xx1, wk2rv);
191 const __m128 xx3 =
192 _mm_mul_ps(wk2iv,
193 _mm_castsi128_ps(_mm_shuffle_epi32(
194 _mm_castps_si128(xx1), _MM_SHUFFLE(2, 3, 0, 1))));
195 const __m128 xx4 = _mm_add_ps(xx2, xx3);
196
197 const __m128 x3i0_3r0_3i1_x3r1 = _mm_castsi128_ps(_mm_shuffle_epi32(
198 _mm_castps_si128(x3r0_3i0_3r1_x3i1), _MM_SHUFFLE(2, 3, 0, 1)));
199 const __m128 x3_swapped = _mm_mul_ps(mm_swap_sign, x3i0_3r0_3i1_x3r1);
200 const __m128 x1_x3_add = _mm_add_ps(x1r0_1i0_1r1_x1i1, x3_swapped);
201 const __m128 x1_x3_sub = _mm_sub_ps(x1r0_1i0_1r1_x1i1, x3_swapped);
202
203 const __m128 xx10 = _mm_mul_ps(x1_x3_add, wk1rv);
204 const __m128 xx11 = _mm_mul_ps(
205 wk1iv,
206 _mm_castsi128_ps(_mm_shuffle_epi32(_mm_castps_si128(x1_x3_add),
207 _MM_SHUFFLE(2, 3, 0, 1))));
208 const __m128 xx12 = _mm_add_ps(xx10, xx11);
209
210 const __m128 xx20 = _mm_mul_ps(x1_x3_sub, wk3rv);
211 const __m128 xx21 = _mm_mul_ps(
212 wk3iv,
213 _mm_castsi128_ps(_mm_shuffle_epi32(_mm_castps_si128(x1_x3_sub),
214 _MM_SHUFFLE(2, 3, 0, 1))));
215 const __m128 xx22 = _mm_add_ps(xx20, xx21);
216
217 _mm_storel_epi64((__m128i*)&a[j0 + 0], _mm_castps_si128(xx));
218 _mm_storel_epi64(
219 (__m128i*)&a[j0 + 32],
220 _mm_shuffle_epi32(_mm_castps_si128(xx), _MM_SHUFFLE(3, 2, 3, 2)));
221
222 _mm_storel_epi64((__m128i*)&a[j0 + 16], _mm_castps_si128(xx4));
223 _mm_storel_epi64(
224 (__m128i*)&a[j0 + 48],
225 _mm_shuffle_epi32(_mm_castps_si128(xx4), _MM_SHUFFLE(3, 2, 3, 2)));
226
227 _mm_storel_epi64((__m128i*)&a[j0 + 8], _mm_castps_si128(xx12));
228 _mm_storel_epi64(
229 (__m128i*)&a[j0 + 40],
230 _mm_shuffle_epi32(_mm_castps_si128(xx12), _MM_SHUFFLE(3, 2, 3, 2)));
231
232 _mm_storel_epi64((__m128i*)&a[j0 + 24], _mm_castps_si128(xx22));
233 _mm_storel_epi64(
234 (__m128i*)&a[j0 + 56],
235 _mm_shuffle_epi32(_mm_castps_si128(xx22), _MM_SHUFFLE(3, 2, 3, 2)));
236 }
237 }
238 }
239
rftfsub_128_SSE2(float * a)240 static void rftfsub_128_SSE2(float* a) {
241 const float* c = rdft_w + 32;
242 int j1, j2, k1, k2;
243 float wkr, wki, xr, xi, yr, yi;
244
245 static const ALIGN16_BEG float ALIGN16_END
246 k_half[4] = {0.5f, 0.5f, 0.5f, 0.5f};
247 const __m128 mm_half = _mm_load_ps(k_half);
248
249 // Vectorized code (four at once).
250 // Note: commented number are indexes for the first iteration of the loop.
251 for (j1 = 1, j2 = 2; j2 + 7 < 64; j1 += 4, j2 += 8) {
252 // Load 'wk'.
253 const __m128 c_j1 = _mm_loadu_ps(&c[j1]); // 1, 2, 3, 4,
254 const __m128 c_k1 = _mm_loadu_ps(&c[29 - j1]); // 28, 29, 30, 31,
255 const __m128 wkrt = _mm_sub_ps(mm_half, c_k1); // 28, 29, 30, 31,
256 const __m128 wkr_ =
257 _mm_shuffle_ps(wkrt, wkrt, _MM_SHUFFLE(0, 1, 2, 3)); // 31, 30, 29, 28,
258 const __m128 wki_ = c_j1; // 1, 2, 3, 4,
259 // Load and shuffle 'a'.
260 const __m128 a_j2_0 = _mm_loadu_ps(&a[0 + j2]); // 2, 3, 4, 5,
261 const __m128 a_j2_4 = _mm_loadu_ps(&a[4 + j2]); // 6, 7, 8, 9,
262 const __m128 a_k2_0 = _mm_loadu_ps(&a[122 - j2]); // 120, 121, 122, 123,
263 const __m128 a_k2_4 = _mm_loadu_ps(&a[126 - j2]); // 124, 125, 126, 127,
264 const __m128 a_j2_p0 = _mm_shuffle_ps(
265 a_j2_0, a_j2_4, _MM_SHUFFLE(2, 0, 2, 0)); // 2, 4, 6, 8,
266 const __m128 a_j2_p1 = _mm_shuffle_ps(
267 a_j2_0, a_j2_4, _MM_SHUFFLE(3, 1, 3, 1)); // 3, 5, 7, 9,
268 const __m128 a_k2_p0 = _mm_shuffle_ps(
269 a_k2_4, a_k2_0, _MM_SHUFFLE(0, 2, 0, 2)); // 126, 124, 122, 120,
270 const __m128 a_k2_p1 = _mm_shuffle_ps(
271 a_k2_4, a_k2_0, _MM_SHUFFLE(1, 3, 1, 3)); // 127, 125, 123, 121,
272 // Calculate 'x'.
273 const __m128 xr_ = _mm_sub_ps(a_j2_p0, a_k2_p0);
274 // 2-126, 4-124, 6-122, 8-120,
275 const __m128 xi_ = _mm_add_ps(a_j2_p1, a_k2_p1);
276 // 3-127, 5-125, 7-123, 9-121,
277 // Calculate product into 'y'.
278 // yr = wkr * xr - wki * xi;
279 // yi = wkr * xi + wki * xr;
280 const __m128 a_ = _mm_mul_ps(wkr_, xr_);
281 const __m128 b_ = _mm_mul_ps(wki_, xi_);
282 const __m128 c_ = _mm_mul_ps(wkr_, xi_);
283 const __m128 d_ = _mm_mul_ps(wki_, xr_);
284 const __m128 yr_ = _mm_sub_ps(a_, b_); // 2-126, 4-124, 6-122, 8-120,
285 const __m128 yi_ = _mm_add_ps(c_, d_); // 3-127, 5-125, 7-123, 9-121,
286 // Update 'a'.
287 // a[j2 + 0] -= yr;
288 // a[j2 + 1] -= yi;
289 // a[k2 + 0] += yr;
290 // a[k2 + 1] -= yi;
291 const __m128 a_j2_p0n = _mm_sub_ps(a_j2_p0, yr_); // 2, 4, 6, 8,
292 const __m128 a_j2_p1n = _mm_sub_ps(a_j2_p1, yi_); // 3, 5, 7, 9,
293 const __m128 a_k2_p0n = _mm_add_ps(a_k2_p0, yr_); // 126, 124, 122, 120,
294 const __m128 a_k2_p1n = _mm_sub_ps(a_k2_p1, yi_); // 127, 125, 123, 121,
295 // Shuffle in right order and store.
296 const __m128 a_j2_0n = _mm_unpacklo_ps(a_j2_p0n, a_j2_p1n);
297 // 2, 3, 4, 5,
298 const __m128 a_j2_4n = _mm_unpackhi_ps(a_j2_p0n, a_j2_p1n);
299 // 6, 7, 8, 9,
300 const __m128 a_k2_0nt = _mm_unpackhi_ps(a_k2_p0n, a_k2_p1n);
301 // 122, 123, 120, 121,
302 const __m128 a_k2_4nt = _mm_unpacklo_ps(a_k2_p0n, a_k2_p1n);
303 // 126, 127, 124, 125,
304 const __m128 a_k2_0n = _mm_shuffle_ps(
305 a_k2_0nt, a_k2_0nt, _MM_SHUFFLE(1, 0, 3, 2)); // 120, 121, 122, 123,
306 const __m128 a_k2_4n = _mm_shuffle_ps(
307 a_k2_4nt, a_k2_4nt, _MM_SHUFFLE(1, 0, 3, 2)); // 124, 125, 126, 127,
308 _mm_storeu_ps(&a[0 + j2], a_j2_0n);
309 _mm_storeu_ps(&a[4 + j2], a_j2_4n);
310 _mm_storeu_ps(&a[122 - j2], a_k2_0n);
311 _mm_storeu_ps(&a[126 - j2], a_k2_4n);
312 }
313 // Scalar code for the remaining items.
314 for (; j2 < 64; j1 += 1, j2 += 2) {
315 k2 = 128 - j2;
316 k1 = 32 - j1;
317 wkr = 0.5f - c[k1];
318 wki = c[j1];
319 xr = a[j2 + 0] - a[k2 + 0];
320 xi = a[j2 + 1] + a[k2 + 1];
321 yr = wkr * xr - wki * xi;
322 yi = wkr * xi + wki * xr;
323 a[j2 + 0] -= yr;
324 a[j2 + 1] -= yi;
325 a[k2 + 0] += yr;
326 a[k2 + 1] -= yi;
327 }
328 }
329
rftbsub_128_SSE2(float * a)330 static void rftbsub_128_SSE2(float* a) {
331 const float* c = rdft_w + 32;
332 int j1, j2, k1, k2;
333 float wkr, wki, xr, xi, yr, yi;
334
335 static const ALIGN16_BEG float ALIGN16_END
336 k_half[4] = {0.5f, 0.5f, 0.5f, 0.5f};
337 const __m128 mm_half = _mm_load_ps(k_half);
338
339 a[1] = -a[1];
340 // Vectorized code (four at once).
341 // Note: commented number are indexes for the first iteration of the loop.
342 for (j1 = 1, j2 = 2; j2 + 7 < 64; j1 += 4, j2 += 8) {
343 // Load 'wk'.
344 const __m128 c_j1 = _mm_loadu_ps(&c[j1]); // 1, 2, 3, 4,
345 const __m128 c_k1 = _mm_loadu_ps(&c[29 - j1]); // 28, 29, 30, 31,
346 const __m128 wkrt = _mm_sub_ps(mm_half, c_k1); // 28, 29, 30, 31,
347 const __m128 wkr_ =
348 _mm_shuffle_ps(wkrt, wkrt, _MM_SHUFFLE(0, 1, 2, 3)); // 31, 30, 29, 28,
349 const __m128 wki_ = c_j1; // 1, 2, 3, 4,
350 // Load and shuffle 'a'.
351 const __m128 a_j2_0 = _mm_loadu_ps(&a[0 + j2]); // 2, 3, 4, 5,
352 const __m128 a_j2_4 = _mm_loadu_ps(&a[4 + j2]); // 6, 7, 8, 9,
353 const __m128 a_k2_0 = _mm_loadu_ps(&a[122 - j2]); // 120, 121, 122, 123,
354 const __m128 a_k2_4 = _mm_loadu_ps(&a[126 - j2]); // 124, 125, 126, 127,
355 const __m128 a_j2_p0 = _mm_shuffle_ps(
356 a_j2_0, a_j2_4, _MM_SHUFFLE(2, 0, 2, 0)); // 2, 4, 6, 8,
357 const __m128 a_j2_p1 = _mm_shuffle_ps(
358 a_j2_0, a_j2_4, _MM_SHUFFLE(3, 1, 3, 1)); // 3, 5, 7, 9,
359 const __m128 a_k2_p0 = _mm_shuffle_ps(
360 a_k2_4, a_k2_0, _MM_SHUFFLE(0, 2, 0, 2)); // 126, 124, 122, 120,
361 const __m128 a_k2_p1 = _mm_shuffle_ps(
362 a_k2_4, a_k2_0, _MM_SHUFFLE(1, 3, 1, 3)); // 127, 125, 123, 121,
363 // Calculate 'x'.
364 const __m128 xr_ = _mm_sub_ps(a_j2_p0, a_k2_p0);
365 // 2-126, 4-124, 6-122, 8-120,
366 const __m128 xi_ = _mm_add_ps(a_j2_p1, a_k2_p1);
367 // 3-127, 5-125, 7-123, 9-121,
368 // Calculate product into 'y'.
369 // yr = wkr * xr + wki * xi;
370 // yi = wkr * xi - wki * xr;
371 const __m128 a_ = _mm_mul_ps(wkr_, xr_);
372 const __m128 b_ = _mm_mul_ps(wki_, xi_);
373 const __m128 c_ = _mm_mul_ps(wkr_, xi_);
374 const __m128 d_ = _mm_mul_ps(wki_, xr_);
375 const __m128 yr_ = _mm_add_ps(a_, b_); // 2-126, 4-124, 6-122, 8-120,
376 const __m128 yi_ = _mm_sub_ps(c_, d_); // 3-127, 5-125, 7-123, 9-121,
377 // Update 'a'.
378 // a[j2 + 0] = a[j2 + 0] - yr;
379 // a[j2 + 1] = yi - a[j2 + 1];
380 // a[k2 + 0] = yr + a[k2 + 0];
381 // a[k2 + 1] = yi - a[k2 + 1];
382 const __m128 a_j2_p0n = _mm_sub_ps(a_j2_p0, yr_); // 2, 4, 6, 8,
383 const __m128 a_j2_p1n = _mm_sub_ps(yi_, a_j2_p1); // 3, 5, 7, 9,
384 const __m128 a_k2_p0n = _mm_add_ps(a_k2_p0, yr_); // 126, 124, 122, 120,
385 const __m128 a_k2_p1n = _mm_sub_ps(yi_, a_k2_p1); // 127, 125, 123, 121,
386 // Shuffle in right order and store.
387 const __m128 a_j2_0n = _mm_unpacklo_ps(a_j2_p0n, a_j2_p1n);
388 // 2, 3, 4, 5,
389 const __m128 a_j2_4n = _mm_unpackhi_ps(a_j2_p0n, a_j2_p1n);
390 // 6, 7, 8, 9,
391 const __m128 a_k2_0nt = _mm_unpackhi_ps(a_k2_p0n, a_k2_p1n);
392 // 122, 123, 120, 121,
393 const __m128 a_k2_4nt = _mm_unpacklo_ps(a_k2_p0n, a_k2_p1n);
394 // 126, 127, 124, 125,
395 const __m128 a_k2_0n = _mm_shuffle_ps(
396 a_k2_0nt, a_k2_0nt, _MM_SHUFFLE(1, 0, 3, 2)); // 120, 121, 122, 123,
397 const __m128 a_k2_4n = _mm_shuffle_ps(
398 a_k2_4nt, a_k2_4nt, _MM_SHUFFLE(1, 0, 3, 2)); // 124, 125, 126, 127,
399 _mm_storeu_ps(&a[0 + j2], a_j2_0n);
400 _mm_storeu_ps(&a[4 + j2], a_j2_4n);
401 _mm_storeu_ps(&a[122 - j2], a_k2_0n);
402 _mm_storeu_ps(&a[126 - j2], a_k2_4n);
403 }
404 // Scalar code for the remaining items.
405 for (; j2 < 64; j1 += 1, j2 += 2) {
406 k2 = 128 - j2;
407 k1 = 32 - j1;
408 wkr = 0.5f - c[k1];
409 wki = c[j1];
410 xr = a[j2 + 0] - a[k2 + 0];
411 xi = a[j2 + 1] + a[k2 + 1];
412 yr = wkr * xr + wki * xi;
413 yi = wkr * xi - wki * xr;
414 a[j2 + 0] = a[j2 + 0] - yr;
415 a[j2 + 1] = yi - a[j2 + 1];
416 a[k2 + 0] = yr + a[k2 + 0];
417 a[k2 + 1] = yi - a[k2 + 1];
418 }
419 a[65] = -a[65];
420 }
421
aec_rdft_init_sse2(void)422 void aec_rdft_init_sse2(void) {
423 cft1st_128 = cft1st_128_SSE2;
424 cftmdl_128 = cftmdl_128_SSE2;
425 rftfsub_128 = rftfsub_128_SSE2;
426 rftbsub_128 = rftbsub_128_SSE2;
427 }
428