summaryrefslogtreecommitdiff
path: root/media/libsoundtouch/src/sse_optimized.cpp
blob: fa622efa55a1ef074203deb096716e3cefff1722 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
////////////////////////////////////////////////////////////////////////////////
///
/// SSE optimized routines for Pentium-III, Athlon-XP and later CPUs. All SSE 
/// optimized functions have been gathered into this single source 
/// code file, regardless to their class or original source code file, in order 
/// to ease porting the library to other compiler and processor platforms.
///
/// The SSE-optimizations are programmed using SSE compiler intrinsics that
/// are supported both by Microsoft Visual C++ and GCC compilers, so this file
/// should compile with both toolsets.
///
/// NOTICE: If using Visual Studio 6.0, you'll need to install the "Visual C++ 
/// 6.0 processor pack" update to support SSE instruction set. The update is 
/// available for download at Microsoft Developers Network, see here:
/// http://msdn.microsoft.com/en-us/vstudio/aa718349.aspx
///
/// If the above URL is expired or removed, go to "http://msdn.microsoft.com" and 
/// perform a search with keywords "processor pack".
///
/// Author        : Copyright (c) Olli Parviainen
/// Author e-mail : oparviai 'at' iki.fi
/// SoundTouch WWW: http://www.surina.net/soundtouch
///
////////////////////////////////////////////////////////////////////////////////
//
// Last changed  : $Date: 2015-02-21 21:24:29 +0000 (Sat, 21 Feb 2015) $
// File revision : $Revision: 4 $
//
// $Id: sse_optimized.cpp 202 2015-02-21 21:24:29Z oparviai $
//
////////////////////////////////////////////////////////////////////////////////
//
// License :
//
//  SoundTouch audio processing library
//  Copyright (c) Olli Parviainen
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
////////////////////////////////////////////////////////////////////////////////

#include "cpu_detect.h"
#include "STTypes.h"

using namespace soundtouch;

#ifdef SOUNDTOUCH_ALLOW_SSE

// SSE routines available only with float sample type    

//////////////////////////////////////////////////////////////////////////////
//
// implementation of SSE optimized functions of class 'TDStretchSSE'
//
//////////////////////////////////////////////////////////////////////////////

#include "TDStretch.h"
#include <xmmintrin.h>
#include <math.h>

// Calculates cross correlation of two buffers
double TDStretchSSE::calcCrossCorr(const float *pV1, const float *pV2, double &anorm) const
{
    int i;
    const float *pVec1;
    const __m128 *pVec2;
    __m128 vSum, vNorm;

    // Note. It means a major slow-down if the routine needs to tolerate 
    // unaligned __m128 memory accesses. It's way faster if we can skip 
    // unaligned slots and use _mm_load_ps instruction instead of _mm_loadu_ps.
    // This can mean up to ~ 10-fold difference (incl. part of which is
    // due to skipping every second round for stereo sound though).
    //
    // Compile-time define SOUNDTOUCH_ALLOW_NONEXACT_SIMD_OPTIMIZATION is provided
    // for choosing if this little cheating is allowed.

#ifdef SOUNDTOUCH_ALLOW_NONEXACT_SIMD_OPTIMIZATION
    // Little cheating allowed, return valid correlation only for 
    // aligned locations, meaning every second round for stereo sound.

    #define _MM_LOAD    _mm_load_ps

    if (((ulongptr)pV1) & 15) return -1e50;    // skip unaligned locations

#else
    // No cheating allowed, use unaligned load & take the resulting
    // performance hit.
    #define _MM_LOAD    _mm_loadu_ps
#endif 

    // ensure overlapLength is divisible by 8
    assert((overlapLength % 8) == 0);

    // Calculates the cross-correlation value between 'pV1' and 'pV2' vectors
    // Note: pV2 _must_ be aligned to 16-bit boundary, pV1 need not.
    pVec1 = (const float*)pV1;
    pVec2 = (const __m128*)pV2;
    vSum = vNorm = _mm_setzero_ps();

    // Unroll the loop by factor of 4 * 4 operations. Use same routine for
    // stereo & mono, for mono it just means twice the amount of unrolling.
    for (i = 0; i < channels * overlapLength / 16; i ++) 
    {
        __m128 vTemp;
        // vSum += pV1[0..3] * pV2[0..3]
        vTemp = _MM_LOAD(pVec1);
        vSum  = _mm_add_ps(vSum,  _mm_mul_ps(vTemp ,pVec2[0]));
        vNorm = _mm_add_ps(vNorm, _mm_mul_ps(vTemp ,vTemp));

        // vSum += pV1[4..7] * pV2[4..7]
        vTemp = _MM_LOAD(pVec1 + 4);
        vSum  = _mm_add_ps(vSum, _mm_mul_ps(vTemp, pVec2[1]));
        vNorm = _mm_add_ps(vNorm, _mm_mul_ps(vTemp ,vTemp));

        // vSum += pV1[8..11] * pV2[8..11]
        vTemp = _MM_LOAD(pVec1 + 8);
        vSum  = _mm_add_ps(vSum, _mm_mul_ps(vTemp, pVec2[2]));
        vNorm = _mm_add_ps(vNorm, _mm_mul_ps(vTemp ,vTemp));

        // vSum += pV1[12..15] * pV2[12..15]
        vTemp = _MM_LOAD(pVec1 + 12);
        vSum  = _mm_add_ps(vSum, _mm_mul_ps(vTemp, pVec2[3]));
        vNorm = _mm_add_ps(vNorm, _mm_mul_ps(vTemp ,vTemp));

        pVec1 += 16;
        pVec2 += 4;
    }

    // return value = vSum[0] + vSum[1] + vSum[2] + vSum[3]
    float *pvNorm = (float*)&vNorm;
    float norm = (pvNorm[0] + pvNorm[1] + pvNorm[2] + pvNorm[3]);
    anorm = norm;

    float *pvSum = (float*)&vSum;
    return (double)(pvSum[0] + pvSum[1] + pvSum[2] + pvSum[3]) / sqrt(norm < 1e-9 ? 1.0 : norm);

    /* This is approximately corresponding routine in C-language yet without normalization:
    double corr, norm;
    uint i;

    // Calculates the cross-correlation value between 'pV1' and 'pV2' vectors
    corr = norm = 0.0;
    for (i = 0; i < channels * overlapLength / 16; i ++) 
    {
        corr += pV1[0] * pV2[0] +
                pV1[1] * pV2[1] +
                pV1[2] * pV2[2] +
                pV1[3] * pV2[3] +
                pV1[4] * pV2[4] +
                pV1[5] * pV2[5] +
                pV1[6] * pV2[6] +
                pV1[7] * pV2[7] +
                pV1[8] * pV2[8] +
                pV1[9] * pV2[9] +
                pV1[10] * pV2[10] +
                pV1[11] * pV2[11] +
                pV1[12] * pV2[12] +
                pV1[13] * pV2[13] +
                pV1[14] * pV2[14] +
                pV1[15] * pV2[15];

    for (j = 0; j < 15; j ++) norm += pV1[j] * pV1[j];

        pV1 += 16;
        pV2 += 16;
    }
    return corr / sqrt(norm);
    */
}



double TDStretchSSE::calcCrossCorrAccumulate(const float *pV1, const float *pV2, double &norm) const
{
    // call usual calcCrossCorr function because SSE does not show big benefit of 
    // accumulating "norm" value, and also the "norm" rolling algorithm would get 
    // complicated due to SSE-specific alignment-vs-nonexact correlation rules.
    return calcCrossCorr(pV1, pV2, norm);
}


//////////////////////////////////////////////////////////////////////////////
//
// implementation of SSE optimized functions of class 'FIRFilter'
//
//////////////////////////////////////////////////////////////////////////////

#include "FIRFilter.h"

FIRFilterSSE::FIRFilterSSE() : FIRFilter()
{
    filterCoeffsAlign = NULL;
    filterCoeffsUnalign = NULL;
}


FIRFilterSSE::~FIRFilterSSE()
{
    delete[] filterCoeffsUnalign;
    filterCoeffsAlign = NULL;
    filterCoeffsUnalign = NULL;
}


// (overloaded) Calculates filter coefficients for SSE routine
void FIRFilterSSE::setCoefficients(const float *coeffs, uint newLength, uint uResultDivFactor)
{
    uint i;
    float fDivider;

    FIRFilter::setCoefficients(coeffs, newLength, uResultDivFactor);

    // Scale the filter coefficients so that it won't be necessary to scale the filtering result
    // also rearrange coefficients suitably for SSE
    // Ensure that filter coeffs array is aligned to 16-byte boundary
    delete[] filterCoeffsUnalign;
    filterCoeffsUnalign = new float[2 * newLength + 4];
    filterCoeffsAlign = (float *)SOUNDTOUCH_ALIGN_POINTER_16(filterCoeffsUnalign);

    fDivider = (float)resultDivider;

    // rearrange the filter coefficients for mmx routines 
    for (i = 0; i < newLength; i ++)
    {
        filterCoeffsAlign[2 * i + 0] =
        filterCoeffsAlign[2 * i + 1] = coeffs[i + 0] / fDivider;
    }
}



// SSE-optimized version of the filter routine for stereo sound
uint FIRFilterSSE::evaluateFilterStereo(float *dest, const float *source, uint numSamples) const
{
    int count = (int)((numSamples - length) & (uint)-2);
    int j;

    assert(count % 2 == 0);

    if (count < 2) return 0;

    assert(source != NULL);
    assert(dest != NULL);
    assert((length % 8) == 0);
    assert(filterCoeffsAlign != NULL);
    assert(((ulongptr)filterCoeffsAlign) % 16 == 0);

    // filter is evaluated for two stereo samples with each iteration, thus use of 'j += 2'
    #pragma omp parallel for
    for (j = 0; j < count; j += 2)
    {
        const float *pSrc;
        float *pDest;
        const __m128 *pFil;
        __m128 sum1, sum2;
        uint i;

        pSrc = (const float*)source + j * 2;      // source audio data
        pDest = dest + j * 2;                     // destination audio data
        pFil = (const __m128*)filterCoeffsAlign;  // filter coefficients. NOTE: Assumes coefficients 
                                                  // are aligned to 16-byte boundary
        sum1 = sum2 = _mm_setzero_ps();

        for (i = 0; i < length / 8; i ++) 
        {
            // Unroll loop for efficiency & calculate filter for 2*2 stereo samples 
            // at each pass

            // sum1 is accu for 2*2 filtered stereo sound data at the primary sound data offset
            // sum2 is accu for 2*2 filtered stereo sound data for the next sound sample offset.

            sum1 = _mm_add_ps(sum1, _mm_mul_ps(_mm_loadu_ps(pSrc)    , pFil[0]));
            sum2 = _mm_add_ps(sum2, _mm_mul_ps(_mm_loadu_ps(pSrc + 2), pFil[0]));

            sum1 = _mm_add_ps(sum1, _mm_mul_ps(_mm_loadu_ps(pSrc + 4), pFil[1]));
            sum2 = _mm_add_ps(sum2, _mm_mul_ps(_mm_loadu_ps(pSrc + 6), pFil[1]));

            sum1 = _mm_add_ps(sum1, _mm_mul_ps(_mm_loadu_ps(pSrc + 8) ,  pFil[2]));
            sum2 = _mm_add_ps(sum2, _mm_mul_ps(_mm_loadu_ps(pSrc + 10), pFil[2]));

            sum1 = _mm_add_ps(sum1, _mm_mul_ps(_mm_loadu_ps(pSrc + 12), pFil[3]));
            sum2 = _mm_add_ps(sum2, _mm_mul_ps(_mm_loadu_ps(pSrc + 14), pFil[3]));

            pSrc += 16;
            pFil += 4;
        }

        // Now sum1 and sum2 both have a filtered 2-channel sample each, but we still need
        // to sum the two hi- and lo-floats of these registers together.

        // post-shuffle & add the filtered values and store to dest.
        _mm_storeu_ps(pDest, _mm_add_ps(
                    _mm_shuffle_ps(sum1, sum2, _MM_SHUFFLE(1,0,3,2)),   // s2_1 s2_0 s1_3 s1_2
                    _mm_shuffle_ps(sum1, sum2, _MM_SHUFFLE(3,2,1,0))    // s2_3 s2_2 s1_1 s1_0
                    ));
    }

    // Ideas for further improvement:
    // 1. If it could be guaranteed that 'source' were always aligned to 16-byte 
    //    boundary, a faster aligned '_mm_load_ps' instruction could be used.
    // 2. If it could be guaranteed that 'dest' were always aligned to 16-byte 
    //    boundary, a faster '_mm_store_ps' instruction could be used.

    return (uint)count;

    /* original routine in C-language. please notice the C-version has differently 
       organized coefficients though.
    double suml1, suml2;
    double sumr1, sumr2;
    uint i, j;

    for (j = 0; j < count; j += 2)
    {
        const float *ptr;
        const float *pFil;

        suml1 = sumr1 = 0.0;
        suml2 = sumr2 = 0.0;
        ptr = src;
        pFil = filterCoeffs;
        for (i = 0; i < lengthLocal; i ++) 
        {
            // unroll loop for efficiency.

            suml1 += ptr[0] * pFil[0] + 
                     ptr[2] * pFil[2] +
                     ptr[4] * pFil[4] +
                     ptr[6] * pFil[6];

            sumr1 += ptr[1] * pFil[1] + 
                     ptr[3] * pFil[3] +
                     ptr[5] * pFil[5] +
                     ptr[7] * pFil[7];

            suml2 += ptr[8] * pFil[0] + 
                     ptr[10] * pFil[2] +
                     ptr[12] * pFil[4] +
                     ptr[14] * pFil[6];

            sumr2 += ptr[9] * pFil[1] + 
                     ptr[11] * pFil[3] +
                     ptr[13] * pFil[5] +
                     ptr[15] * pFil[7];

            ptr += 16;
            pFil += 8;
        }
        dest[0] = (float)suml1;
        dest[1] = (float)sumr1;
        dest[2] = (float)suml2;
        dest[3] = (float)sumr2;

        src += 4;
        dest += 4;
    }
    */
}

#endif  // SOUNDTOUCH_ALLOW_SSE