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+////////////////////////////////////////////////////////////////////////////////
+///
+/// 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
+///
+////////////////////////////////////////////////////////////////////////////////
+//
+// 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 __m64 *pVec1, *pVec2;
+ __m64 shifter;
+ __m64 accu, normaccu;
+ long corr, norm;
+ int i;
+
+ pVec1 = (__m64*)pV1;
+ pVec2 = (__m64*)pV2;
+
+ shifter = _m_from_int(overlapDividerBitsNorm);
+ 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();
+
+ if (norm > (long)maxnorm)
+ {
+ // modify 'maxnorm' inside critical section to avoid multi-access conflict if in OpenMP mode
+ #pragma omp critical
+ if (norm > (long)maxnorm)
+ {
+ maxnorm = norm;
+ }
+ }
+
+ // 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 __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]) >> overlapDividerBitsNorm;
+ }
+
+ pVec1 = (__m64*)pV1;
+ pVec2 = (__m64*)pV2;
+
+ shifter = _m_from_int(overlapDividerBitsNorm);
+ 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]) >> overlapDividerBitsNorm;
+ }
+ dnorm += (double)lnorm;
+
+ if (lnorm > (long)maxnorm)
+ {
+ maxnorm = 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(overlapDividerBitsPure + 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()
+{
+ filterCoeffsAlign = NULL;
+ 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;
+}
+
+#else
+
+// workaround to not complain about empty module
+bool _dontcomplain_mmx_empty;
+
+#endif // SOUNDTOUCH_ALLOW_MMX
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