Audio: ASRC: Optimize for HiFi5 impulse response calculations

This patch optimizes for HiFi5 the polynomials evaluations to
calculate rate conversion FIR impulse responses. The functions
asrc_calc_impulse_response_n[4-7]() calculate with Horner's
method each coefficient of the FIR with 3th to 5th order
polynomial.

The header files with polynomials coefficients are re-ordered for
for direct 128 bits int32x4 loads. The loop is modified to calculate
four FIR coefficients per loop. Since there is no suitable quad-MAC
instruction found, the previous dual-MAC is used twice.

The saving is 11.6 MCPS, from 38.75 to 27.20 MCPS for 32 bits stereo
44.1 to 48 kHz conversion, push mode.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

src/audio/asrc/asrc_farrow.c

@@ -145,6 +145,51 @@ static const struct asrc_filter_params c_filter_params[CR_NUM] = {
  * coefficients will be attached to the _Src_farrow struct via the
  * initialise_filter function.
  */
+
+#if SOF_USE_MIN_HIFI(5, ASRC)
+#include "coef/asrc_farrow_coeff_4x_44100Hz_to_48000Hz.h"
+#include "coef/asrc_farrow_coeff_4x_48000Hz_to_48000Hz.h"
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_24000_TO_08000)
+#include "coef/asrc_farrow_coeff_4x_24000Hz_to_08000Hz.h"
+#endif
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_24000_TO_16000)
+#include "coef/asrc_farrow_coeff_4x_24000Hz_to_16000Hz.h"
+#endif
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_48000_TO_08000)
+#include "coef/asrc_farrow_coeff_4x_48000Hz_to_08000Hz.h"
+#endif
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_48000_TO_11025)
+#include "coef/asrc_farrow_coeff_4x_48000Hz_to_11025Hz.h"
+#endif
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_48000_TO_12000)
+#include "coef/asrc_farrow_coeff_4x_48000Hz_to_12000Hz.h"
+#endif
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_48000_TO_16000)
+#include "coef/asrc_farrow_coeff_4x_48000Hz_to_16000Hz.h"
+#endif
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_48000_TO_22050)
+#include "coef/asrc_farrow_coeff_4x_48000Hz_to_22050Hz.h"
+#endif
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_48000_TO_24000)
+#include "coef/asrc_farrow_coeff_4x_48000Hz_to_24000Hz.h"
+#endif
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_48000_TO_32000)
+#include "coef/asrc_farrow_coeff_4x_48000Hz_to_32000Hz.h"
+#endif
+
+#if (CONFIG_ASRC_SUPPORT_CONVERSION_48000_TO_44100)
+#include "coef/asrc_farrow_coeff_4x_48000Hz_to_44100Hz.h"
+#endif
+#else
 #include "coef/asrc_farrow_coeff_44100Hz_to_48000Hz.h"
 
 #include "coef/asrc_farrow_coeff_48000Hz_to_48000Hz.h"
@@ -188,6 +233,7 @@ static const struct asrc_filter_params c_filter_params[CR_NUM] = {
 #if (CONFIG_ASRC_SUPPORT_CONVERSION_48000_TO_44100)
 #include "coef/asrc_farrow_coeff_48000Hz_to_44100Hz.h"
 #endif
+#endif
 
 /*
  * FUNCTION DECLARATIONS