The Tor Browser: media/libsoundtouch/src/mmx_optimized.cpp@97036ab72558 (annotated)

media/libsoundtouch/src/mmx_optimized.cpp@97036ab72558 (annotated)

media/libsoundtouch/src/mmx_optimized.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 ////////////////////////////////////////////////////////////////////////////////
 ///
 /// MMX optimized routines. All MMX 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 MMX-optimizations are programmed using MMX 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 compiler intrinsic syntax. The update
 /// is available for download at Microsoft Developers Network, see here:
 /// http://msdn.microsoft.com/en-us/vstudio/aa718349.aspx
 ///
 /// Author        : Copyright (c) Olli Parviainen
 /// Author e-mail : oparviai 'at' iki.fi
 /// SoundTouch WWW: http://www.surina.net/soundtouch
 ///
 ////////////////////////////////////////////////////////////////////////////////
 //
 // Last changed  : $Date: 2014-01-07 12:25:40 -0600 (Tue, 07 Jan 2014) $
 // File revision : $Revision: 4 $
 //
 // $Id: mmx_optimized.cpp 184 2014-01-07 18:25:40Z 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 "STTypes.h"
 #ifdef SOUNDTOUCH_ALLOW_MMX
 // MMX routines available only with integer sample type
 using namespace soundtouch;
 //////////////////////////////////////////////////////////////////////////////
 //
 // implementation of MMX optimized functions of class 'TDStretchMMX'
 //
 //////////////////////////////////////////////////////////////////////////////
 #include "TDStretch.h"
 #include <mmintrin.h>
 #include <limits.h>
 #include <math.h>
 // Calculates cross correlation of two buffers
 double TDStretchMMX::calcCrossCorr(const short *pV1, const short *pV2, double &dnorm) const
 {
     const __m64 *pVec1, *pVec2;
     __m64 shifter;
     __m64 accu, normaccu;
     long corr, norm;
     int i;
     pVec1 = (__m64*)pV1;
     pVec2 = (__m64*)pV2;
     shifter = _m_from_int(overlapDividerBits);
     normaccu = accu = _mm_setzero_si64();
     // Process 4 parallel sets of 2 * stereo samples or 4 * mono samples
     // during each round for improved CPU-level parallellization.
     for (i = 0; i < channels * overlapLength / 16; i ++)
     {
         __m64 temp, temp2;
         // dictionary of instructions:
         // _m_pmaddwd   : 4*16bit multiply-add, resulting two 32bits = [a0*b0+a1*b1 ; a2*b2+a3*b3]
         // _mm_add_pi32 : 2*32bit add
         // _m_psrad     : 32bit right-shift
         temp = _mm_add_pi32(_mm_sra_pi32(_mm_madd_pi16(pVec1[0], pVec2[0]), shifter),
                             _mm_sra_pi32(_mm_madd_pi16(pVec1[1], pVec2[1]), shifter));
         temp2 = _mm_add_pi32(_mm_sra_pi32(_mm_madd_pi16(pVec1[0], pVec1[0]), shifter),
                             _mm_sra_pi32(_mm_madd_pi16(pVec1[1], pVec1[1]), shifter));
         accu = _mm_add_pi32(accu, temp);
         normaccu = _mm_add_pi32(normaccu, temp2);
         temp = _mm_add_pi32(_mm_sra_pi32(_mm_madd_pi16(pVec1[2], pVec2[2]), shifter),
                             _mm_sra_pi32(_mm_madd_pi16(pVec1[3], pVec2[3]), shifter));
         temp2 = _mm_add_pi32(_mm_sra_pi32(_mm_madd_pi16(pVec1[2], pVec1[2]), shifter),
                             _mm_sra_pi32(_mm_madd_pi16(pVec1[3], pVec1[3]), shifter));
         accu = _mm_add_pi32(accu, temp);
         normaccu = _mm_add_pi32(normaccu, temp2);
         pVec1 += 4;
         pVec2 += 4;
     }
     // copy hi-dword of mm0 to lo-dword of mm1, then sum mmo+mm1
     // and finally store the result into the variable "corr"
     accu = _mm_add_pi32(accu, _mm_srli_si64(accu, 32));
     corr = _m_to_int(accu);
     normaccu = _mm_add_pi32(normaccu, _mm_srli_si64(normaccu, 32));
     norm = _m_to_int(normaccu);
     // Clear MMS state
     _m_empty();
     // Normalize result by dividing by sqrt(norm) - this step is easiest
     // done using floating point operation
     dnorm = (double)norm;
     return (double)corr / sqrt(dnorm < 1e-9 ? 1.0 : dnorm);
     // Note: Warning about the missing EMMS instruction is harmless
     // as it'll be called elsewhere.
 }
 /// Update cross-correlation by accumulating "norm" coefficient by previously calculated value
 double TDStretchMMX::calcCrossCorrAccumulate(const short *pV1, const short *pV2, double &dnorm) const
 {
     const __m64 *pVec1, *pVec2;
     __m64 shifter;
     __m64 accu;
     long corr, lnorm;
     int i;
     // cancel first normalizer tap from previous round
     lnorm = 0;
     for (i = 1; i <= channels; i ++)
     {
         lnorm -= (pV1[-i] * pV1[-i]) >> overlapDividerBits;
     }
     pVec1 = (__m64*)pV1;
     pVec2 = (__m64*)pV2;
     shifter = _m_from_int(overlapDividerBits);
     accu = _mm_setzero_si64();
     // Process 4 parallel sets of 2 * stereo samples or 4 * mono samples
     // during each round for improved CPU-level parallellization.
     for (i = 0; i < channels * overlapLength / 16; i ++)
     {
         __m64 temp;
         // dictionary of instructions:
         // _m_pmaddwd   : 4*16bit multiply-add, resulting two 32bits = [a0*b0+a1*b1 ; a2*b2+a3*b3]
         // _mm_add_pi32 : 2*32bit add
         // _m_psrad     : 32bit right-shift
         temp = _mm_add_pi32(_mm_sra_pi32(_mm_madd_pi16(pVec1[0], pVec2[0]), shifter),
                             _mm_sra_pi32(_mm_madd_pi16(pVec1[1], pVec2[1]), shifter));
         accu = _mm_add_pi32(accu, temp);
         temp = _mm_add_pi32(_mm_sra_pi32(_mm_madd_pi16(pVec1[2], pVec2[2]), shifter),
                             _mm_sra_pi32(_mm_madd_pi16(pVec1[3], pVec2[3]), shifter));
         accu = _mm_add_pi32(accu, temp);
         pVec1 += 4;
         pVec2 += 4;
     }
     // copy hi-dword of mm0 to lo-dword of mm1, then sum mmo+mm1
     // and finally store the result into the variable "corr"
     accu = _mm_add_pi32(accu, _mm_srli_si64(accu, 32));
     corr = _m_to_int(accu);
     // Clear MMS state
     _m_empty();
     // update normalizer with last samples of this round
     pV1 = (short *)pVec1;
     for (int j = 1; j <= channels; j ++)
     {
         lnorm += (pV1[-j] * pV1[-j]) >> overlapDividerBits;
     }
     dnorm += (double)lnorm;
     // Normalize result by dividing by sqrt(norm) - this step is easiest
     // done using floating point operation
     return (double)corr / sqrt((dnorm < 1e-9) ? 1.0 : dnorm);
 }
 void TDStretchMMX::clearCrossCorrState()
 {
     // Clear MMS state
     _m_empty();
     //_asm EMMS;
 }
 // MMX-optimized version of the function overlapStereo
 void TDStretchMMX::overlapStereo(short *output, const short *input) const
 {
     const __m64 *pVinput, *pVMidBuf;
     __m64 *pVdest;
     __m64 mix1, mix2, adder, shifter;
     int i;
     pVinput  = (const __m64*)input;
     pVMidBuf = (const __m64*)pMidBuffer;
     pVdest   = (__m64*)output;
     // mix1  = mixer values for 1st stereo sample
     // mix1  = mixer values for 2nd stereo sample
     // adder = adder for updating mixer values after each round
     mix1  = _mm_set_pi16(0, overlapLength,   0, overlapLength);
     adder = _mm_set_pi16(1, -1, 1, -1);
     mix2  = _mm_add_pi16(mix1, adder);
     adder = _mm_add_pi16(adder, adder);
     // Overlaplength-division by shifter. "+1" is to account for "-1" deduced in
     // overlapDividerBits calculation earlier.
     shifter = _m_from_int(overlapDividerBits + 1);
     for (i = 0; i < overlapLength / 4; i ++)
     {
         __m64 temp1, temp2;
         // load & shuffle data so that input & mixbuffer data samples are paired
         temp1 = _mm_unpacklo_pi16(pVMidBuf[0], pVinput[0]);     // = i0l m0l i0r m0r
         temp2 = _mm_unpackhi_pi16(pVMidBuf[0], pVinput[0]);     // = i1l m1l i1r m1r
         // temp = (temp .* mix) >> shifter
         temp1 = _mm_sra_pi32(_mm_madd_pi16(temp1, mix1), shifter);
         temp2 = _mm_sra_pi32(_mm_madd_pi16(temp2, mix2), shifter);
         pVdest[0] = _mm_packs_pi32(temp1, temp2); // pack 2*2*32bit => 4*16bit
         // update mix += adder
         mix1 = _mm_add_pi16(mix1, adder);
         mix2 = _mm_add_pi16(mix2, adder);
         // --- second round begins here ---
         // load & shuffle data so that input & mixbuffer data samples are paired
         temp1 = _mm_unpacklo_pi16(pVMidBuf[1], pVinput[1]);       // = i2l m2l i2r m2r
         temp2 = _mm_unpackhi_pi16(pVMidBuf[1], pVinput[1]);       // = i3l m3l i3r m3r
         // temp = (temp .* mix) >> shifter
         temp1 = _mm_sra_pi32(_mm_madd_pi16(temp1, mix1), shifter);
         temp2 = _mm_sra_pi32(_mm_madd_pi16(temp2, mix2), shifter);
         pVdest[1] = _mm_packs_pi32(temp1, temp2); // pack 2*2*32bit => 4*16bit
         // update mix += adder
         mix1 = _mm_add_pi16(mix1, adder);
         mix2 = _mm_add_pi16(mix2, adder);
         pVinput  += 2;
         pVMidBuf += 2;
         pVdest   += 2;
     }
     _m_empty(); // clear MMS state
 }
 //////////////////////////////////////////////////////////////////////////////
 //
 // implementation of MMX optimized functions of class 'FIRFilter'
 //
 //////////////////////////////////////////////////////////////////////////////
 #include "FIRFilter.h"
 FIRFilterMMX::FIRFilterMMX() : FIRFilter()
 {
     filterCoeffsUnalign = NULL;
 }
 FIRFilterMMX::~FIRFilterMMX()
 {
     delete[] filterCoeffsUnalign;
 }
 // (overloaded) Calculates filter coefficients for MMX routine
 void FIRFilterMMX::setCoefficients(const short *coeffs, uint newLength, uint uResultDivFactor)
 {
     uint i;
     FIRFilter::setCoefficients(coeffs, newLength, uResultDivFactor);
     // Ensure that filter coeffs array is aligned to 16-byte boundary
     delete[] filterCoeffsUnalign;
     filterCoeffsUnalign = new short[2 * newLength + 8];
     filterCoeffsAlign = (short *)SOUNDTOUCH_ALIGN_POINTER_16(filterCoeffsUnalign);
     // rearrange the filter coefficients for mmx routines
     for (i = 0;i < length; i += 4)
     {
         filterCoeffsAlign[2 * i + 0] = coeffs[i + 0];
         filterCoeffsAlign[2 * i + 1] = coeffs[i + 2];
         filterCoeffsAlign[2 * i + 2] = coeffs[i + 0];
         filterCoeffsAlign[2 * i + 3] = coeffs[i + 2];
         filterCoeffsAlign[2 * i + 4] = coeffs[i + 1];
         filterCoeffsAlign[2 * i + 5] = coeffs[i + 3];
         filterCoeffsAlign[2 * i + 6] = coeffs[i + 1];
         filterCoeffsAlign[2 * i + 7] = coeffs[i + 3];
     }
 }
 // mmx-optimized version of the filter routine for stereo sound
 uint FIRFilterMMX::evaluateFilterStereo(short *dest, const short *src, uint numSamples) const
 {
     // Create stack copies of the needed member variables for asm routines :
     uint i, j;
     __m64 *pVdest = (__m64*)dest;
     if (length < 2) return 0;
     for (i = 0; i < (numSamples - length) / 2; i ++)
     {
         __m64 accu1;
         __m64 accu2;
         const __m64 *pVsrc = (const __m64*)src;
         const __m64 *pVfilter = (const __m64*)filterCoeffsAlign;
         accu1 = accu2 = _mm_setzero_si64();
         for (j = 0; j < lengthDiv8 * 2; j ++)
         {
             __m64 temp1, temp2;
             temp1 = _mm_unpacklo_pi16(pVsrc[0], pVsrc[1]);  // = l2 l0 r2 r0
             temp2 = _mm_unpackhi_pi16(pVsrc[0], pVsrc[1]);  // = l3 l1 r3 r1
             accu1 = _mm_add_pi32(accu1, _mm_madd_pi16(temp1, pVfilter[0]));  // += l2*f2+l0*f0 r2*f2+r0*f0
             accu1 = _mm_add_pi32(accu1, _mm_madd_pi16(temp2, pVfilter[1]));  // += l3*f3+l1*f1 r3*f3+r1*f1
             temp1 = _mm_unpacklo_pi16(pVsrc[1], pVsrc[2]);  // = l4 l2 r4 r2
             accu2 = _mm_add_pi32(accu2, _mm_madd_pi16(temp2, pVfilter[0]));  // += l3*f2+l1*f0 r3*f2+r1*f0
             accu2 = _mm_add_pi32(accu2, _mm_madd_pi16(temp1, pVfilter[1]));  // += l4*f3+l2*f1 r4*f3+r2*f1
             // accu1 += l2*f2+l0*f0 r2*f2+r0*f0
             //       += l3*f3+l1*f1 r3*f3+r1*f1
             // accu2 += l3*f2+l1*f0 r3*f2+r1*f0
             //          l4*f3+l2*f1 r4*f3+r2*f1
             pVfilter += 2;
             pVsrc += 2;
         }
         // accu >>= resultDivFactor
         accu1 = _mm_srai_pi32(accu1, resultDivFactor);
         accu2 = _mm_srai_pi32(accu2, resultDivFactor);
         // pack 2*2*32bits => 4*16 bits
         pVdest[0] = _mm_packs_pi32(accu1, accu2);
         src += 4;
         pVdest ++;
     }
    _m_empty();  // clear emms state
     return (numSamples & 0xfffffffe) - length;
 }
 #endif  // SOUNDTOUCH_ALLOW_MMX

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media/libsoundtouch/src/mmx_optimized.cpp@97036ab72558 (annotated)

media/libsoundtouch/src/mmx_optimized.cpp