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/******************************** Fraunhofer IIS ***************************
(C) Copyright Fraunhofer IIS (2010)
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) SBR domain coding
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.
******************************************************************************/
#ifndef INCLUSION_GUARD_CALC_ENV_ARM
#define INCLUSION_GUARD_CALC_ENV_ARM
/*!
\brief Compute maximal value of a complex array (re/im) of a given width
Negative values are temporarily logically or'ed with 0xFFFFFFFF
instead of negating the value, if the sign bit is set.
\param maxVal Preset maximal value
\param reTmp real input signal
\param imTmp imaginary input signal
\return new maximal value
*/
#ifdef FUNCTION_FDK_get_maxval
__asm FIXP_DBL FDK_get_maxval (FIXP_DBL maxVal, FIXP_DBL *reTmp, FIXP_DBL *imTmp, int width )
{
/* Register map:
r0 maxVal
r1 reTmp
r2 imTmp
r3 width
r4 real
r5 imag
*/
PUSH {r4-r5}
MOVS r3, r3, ASR #1
ADC r3, r3, #0
BCS FDK_get_maxval_loop_2nd_part
BEQ FDK_get_maxval_loop_end
FDK_get_maxval_loop
LDR r4, [r1], #4
LDR r5, [r2], #4
EOR r4, r4, r4, ASR #31
EOR r5, r5, r5, ASR #31
ORR r0, r0, r4
ORR r0, r0, r5
FDK_get_maxval_loop_2nd_part
LDR r4, [r1], #4
LDR r5, [r2], #4
EOR r4, r4, r4, ASR #31
EOR r5, r5, r5, ASR #31
ORR r0, r0, r4
ORR r0, r0, r5
SUBS r3, r3, #1
BNE FDK_get_maxval_loop
FDK_get_maxval_loop_end
POP {r4-r5}
BX lr
}
#endif /* FUNCTION_FDK_get_maxval */
#endif /* INCLUSION_GUARD_CALC_ENV_ARM */
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