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/******************************** Fraunhofer IIS ***************************
(C) Copyright Fraunhofer IIS (2011)
All Rights Reserved
Please be advised that this software and/or program delivery is
Confidential Information of Fraunhofer and subject to and covered by the
Fraunhofer IIS Software Evaluation Agreement
between Google Inc. and Fraunhofer
effective and in full force since March 1, 2012.
You may use this software and/or program only under the terms and
conditions described in the above mentioned Fraunhofer IIS Software
Evaluation Agreement. Any other and/or further use requires a separate agreement.
$Id$
Author(s): Arthur Tritthart
Description: (ARM optimised) LPP transposer subroutines
This software and/or program is protected by copyright law and international
treaties. Any reproduction or distribution of this software and/or program,
or any portion of it, may result in severe civil and criminal penalties, and
will be prosecuted to the maximum extent possible under law.
******************************************************************************/
#if defined(__arm__)
#define FUNCTION_LPPTRANSPOSER_func1
#ifdef FUNCTION_LPPTRANSPOSER_func1
/* Note: This code requires only 43 cycles per iteration instead of 61 on ARM926EJ-S */
__attribute__ ((noinline)) static void lppTransposer_func1(
FIXP_DBL *lowBandReal,
FIXP_DBL *lowBandImag,
FIXP_DBL **qmfBufferReal,
FIXP_DBL **qmfBufferImag,
int loops,
int hiBand,
int dynamicScale,
int descale,
FIXP_SGL a0r,
FIXP_SGL a0i,
FIXP_SGL a1r,
FIXP_SGL a1i)
{
FIXP_DBL real1, real2, imag1, imag2, accu1, accu2;
real2 = lowBandReal[-2];
real1 = lowBandReal[-1];
imag2 = lowBandImag[-2];
imag1 = lowBandImag[-1];
for(int i=0; i < loops; i++)
{
accu1 = fMultDiv2( a0r,real1);
accu2 = fMultDiv2( a0i,imag1);
accu1 = fMultAddDiv2(accu1,a1r,real2);
accu2 = fMultAddDiv2(accu2,a1i,imag2);
real2 = fMultDiv2( a1i,real2);
accu1 = accu1 - accu2;
accu1 = accu1 >> dynamicScale;
accu2 = fMultAddDiv2(real2,a1r,imag2);
real2 = real1;
imag2 = imag1;
accu2 = fMultAddDiv2(accu2,a0i,real1);
real1 = lowBandReal[i];
accu2 = fMultAddDiv2(accu2,a0r,imag1);
imag1 = lowBandImag[i];
accu2 = accu2 >> dynamicScale;
accu1 <<= 1;
accu2 <<= 1;
qmfBufferReal[i][hiBand] = accu1 + (real1>>descale);
qmfBufferImag[i][hiBand] = accu2 + (imag1>>descale);
}
}
#endif /* #ifdef FUNCTION_LPPTRANSPOSER_func1 */
#endif /* __arm__ */
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