46ae64cd60
This reverts commit e00426c512.
The way we handle platform-specific intrinsics is not good, so the
current state will not compile on armv8. This commit also requires
SSE4.1 support, which is likely not a good idea for portable binaries.
We'll have to redo this with more caution after 3.2 is released, or
we might simply drop opus as we're only using it as dependency for
theora right now.
Fixes #33606.
377 lines
21 KiB
C
377 lines
21 KiB
C
/* Copyright (c) 2014, Cisco Systems, INC
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Written by XiangMingZhu WeiZhou MinPeng YanWang
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <xmmintrin.h>
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#include <emmintrin.h>
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#include <smmintrin.h>
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#include "SigProc_FIX.h"
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#include "define.h"
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#include "tuning_parameters.h"
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#include "pitch.h"
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#include "celt/x86/x86cpu.h"
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#define MAX_FRAME_SIZE 384 /* subfr_length * nb_subfr = ( 0.005 * 16000 + 16 ) * 4 = 384 */
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#define QA 25
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#define N_BITS_HEAD_ROOM 2
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#define MIN_RSHIFTS -16
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#define MAX_RSHIFTS (32 - QA)
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/* Compute reflection coefficients from input signal */
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void silk_burg_modified_sse4_1(
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opus_int32 *res_nrg, /* O Residual energy */
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opus_int *res_nrg_Q, /* O Residual energy Q value */
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opus_int32 A_Q16[], /* O Prediction coefficients (length order) */
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const opus_int16 x[], /* I Input signal, length: nb_subfr * ( D + subfr_length ) */
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const opus_int32 minInvGain_Q30, /* I Inverse of max prediction gain */
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const opus_int subfr_length, /* I Input signal subframe length (incl. D preceding samples) */
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const opus_int nb_subfr, /* I Number of subframes stacked in x */
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const opus_int D, /* I Order */
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int arch /* I Run-time architecture */
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)
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{
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opus_int k, n, s, lz, rshifts, rshifts_extra, reached_max_gain;
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opus_int32 C0, num, nrg, rc_Q31, invGain_Q30, Atmp_QA, Atmp1, tmp1, tmp2, x1, x2;
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const opus_int16 *x_ptr;
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opus_int32 C_first_row[ SILK_MAX_ORDER_LPC ];
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opus_int32 C_last_row[ SILK_MAX_ORDER_LPC ];
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opus_int32 Af_QA[ SILK_MAX_ORDER_LPC ];
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opus_int32 CAf[ SILK_MAX_ORDER_LPC + 1 ];
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opus_int32 CAb[ SILK_MAX_ORDER_LPC + 1 ];
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opus_int32 xcorr[ SILK_MAX_ORDER_LPC ];
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__m128i FIRST_3210, LAST_3210, ATMP_3210, TMP1_3210, TMP2_3210, T1_3210, T2_3210, PTR_3210, SUBFR_3210, X1_3210, X2_3210;
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__m128i CONST1 = _mm_set1_epi32(1);
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silk_assert( subfr_length * nb_subfr <= MAX_FRAME_SIZE );
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/* Compute autocorrelations, added over subframes */
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silk_sum_sqr_shift( &C0, &rshifts, x, nb_subfr * subfr_length );
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if( rshifts > MAX_RSHIFTS ) {
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C0 = silk_LSHIFT32( C0, rshifts - MAX_RSHIFTS );
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silk_assert( C0 > 0 );
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rshifts = MAX_RSHIFTS;
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} else {
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lz = silk_CLZ32( C0 ) - 1;
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rshifts_extra = N_BITS_HEAD_ROOM - lz;
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if( rshifts_extra > 0 ) {
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rshifts_extra = silk_min( rshifts_extra, MAX_RSHIFTS - rshifts );
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C0 = silk_RSHIFT32( C0, rshifts_extra );
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} else {
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rshifts_extra = silk_max( rshifts_extra, MIN_RSHIFTS - rshifts );
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C0 = silk_LSHIFT32( C0, -rshifts_extra );
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}
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rshifts += rshifts_extra;
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}
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CAb[ 0 ] = CAf[ 0 ] = C0 + silk_SMMUL( SILK_FIX_CONST( FIND_LPC_COND_FAC, 32 ), C0 ) + 1; /* Q(-rshifts) */
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silk_memset( C_first_row, 0, SILK_MAX_ORDER_LPC * sizeof( opus_int32 ) );
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if( rshifts > 0 ) {
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for( s = 0; s < nb_subfr; s++ ) {
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x_ptr = x + s * subfr_length;
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for( n = 1; n < D + 1; n++ ) {
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C_first_row[ n - 1 ] += (opus_int32)silk_RSHIFT64(
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silk_inner_prod16_aligned_64( x_ptr, x_ptr + n, subfr_length - n, arch ), rshifts );
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}
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}
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} else {
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for( s = 0; s < nb_subfr; s++ ) {
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int i;
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opus_int32 d;
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x_ptr = x + s * subfr_length;
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celt_pitch_xcorr(x_ptr, x_ptr + 1, xcorr, subfr_length - D, D, arch );
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for( n = 1; n < D + 1; n++ ) {
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for ( i = n + subfr_length - D, d = 0; i < subfr_length; i++ )
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d = MAC16_16( d, x_ptr[ i ], x_ptr[ i - n ] );
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xcorr[ n - 1 ] += d;
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}
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for( n = 1; n < D + 1; n++ ) {
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C_first_row[ n - 1 ] += silk_LSHIFT32( xcorr[ n - 1 ], -rshifts );
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}
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}
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}
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silk_memcpy( C_last_row, C_first_row, SILK_MAX_ORDER_LPC * sizeof( opus_int32 ) );
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/* Initialize */
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CAb[ 0 ] = CAf[ 0 ] = C0 + silk_SMMUL( SILK_FIX_CONST( FIND_LPC_COND_FAC, 32 ), C0 ) + 1; /* Q(-rshifts) */
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invGain_Q30 = (opus_int32)1 << 30;
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reached_max_gain = 0;
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for( n = 0; n < D; n++ ) {
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/* Update first row of correlation matrix (without first element) */
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/* Update last row of correlation matrix (without last element, stored in reversed order) */
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/* Update C * Af */
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/* Update C * flipud(Af) (stored in reversed order) */
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if( rshifts > -2 ) {
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for( s = 0; s < nb_subfr; s++ ) {
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x_ptr = x + s * subfr_length;
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x1 = -silk_LSHIFT32( (opus_int32)x_ptr[ n ], 16 - rshifts ); /* Q(16-rshifts) */
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x2 = -silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], 16 - rshifts ); /* Q(16-rshifts) */
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tmp1 = silk_LSHIFT32( (opus_int32)x_ptr[ n ], QA - 16 ); /* Q(QA-16) */
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tmp2 = silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], QA - 16 ); /* Q(QA-16) */
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for( k = 0; k < n; k++ ) {
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C_first_row[ k ] = silk_SMLAWB( C_first_row[ k ], x1, x_ptr[ n - k - 1 ] ); /* Q( -rshifts ) */
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C_last_row[ k ] = silk_SMLAWB( C_last_row[ k ], x2, x_ptr[ subfr_length - n + k ] ); /* Q( -rshifts ) */
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Atmp_QA = Af_QA[ k ];
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tmp1 = silk_SMLAWB( tmp1, Atmp_QA, x_ptr[ n - k - 1 ] ); /* Q(QA-16) */
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tmp2 = silk_SMLAWB( tmp2, Atmp_QA, x_ptr[ subfr_length - n + k ] ); /* Q(QA-16) */
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}
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tmp1 = silk_LSHIFT32( -tmp1, 32 - QA - rshifts ); /* Q(16-rshifts) */
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tmp2 = silk_LSHIFT32( -tmp2, 32 - QA - rshifts ); /* Q(16-rshifts) */
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for( k = 0; k <= n; k++ ) {
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CAf[ k ] = silk_SMLAWB( CAf[ k ], tmp1, x_ptr[ n - k ] ); /* Q( -rshift ) */
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CAb[ k ] = silk_SMLAWB( CAb[ k ], tmp2, x_ptr[ subfr_length - n + k - 1 ] ); /* Q( -rshift ) */
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}
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}
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} else {
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for( s = 0; s < nb_subfr; s++ ) {
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x_ptr = x + s * subfr_length;
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x1 = -silk_LSHIFT32( (opus_int32)x_ptr[ n ], -rshifts ); /* Q( -rshifts ) */
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x2 = -silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], -rshifts ); /* Q( -rshifts ) */
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tmp1 = silk_LSHIFT32( (opus_int32)x_ptr[ n ], 17 ); /* Q17 */
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tmp2 = silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], 17 ); /* Q17 */
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X1_3210 = _mm_set1_epi32( x1 );
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X2_3210 = _mm_set1_epi32( x2 );
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TMP1_3210 = _mm_setzero_si128();
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TMP2_3210 = _mm_setzero_si128();
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for( k = 0; k < n - 3; k += 4 ) {
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PTR_3210 = OP_CVTEPI16_EPI32_M64( &x_ptr[ n - k - 1 - 3 ] );
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SUBFR_3210 = OP_CVTEPI16_EPI32_M64( &x_ptr[ subfr_length - n + k ] );
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FIRST_3210 = _mm_loadu_si128( (__m128i *)&C_first_row[ k ] );
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PTR_3210 = _mm_shuffle_epi32( PTR_3210, _MM_SHUFFLE( 0, 1, 2, 3 ) );
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LAST_3210 = _mm_loadu_si128( (__m128i *)&C_last_row[ k ] );
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ATMP_3210 = _mm_loadu_si128( (__m128i *)&Af_QA[ k ] );
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T1_3210 = _mm_mullo_epi32( PTR_3210, X1_3210 );
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T2_3210 = _mm_mullo_epi32( SUBFR_3210, X2_3210 );
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ATMP_3210 = _mm_srai_epi32( ATMP_3210, 7 );
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ATMP_3210 = _mm_add_epi32( ATMP_3210, CONST1 );
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ATMP_3210 = _mm_srai_epi32( ATMP_3210, 1 );
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FIRST_3210 = _mm_add_epi32( FIRST_3210, T1_3210 );
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LAST_3210 = _mm_add_epi32( LAST_3210, T2_3210 );
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PTR_3210 = _mm_mullo_epi32( ATMP_3210, PTR_3210 );
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SUBFR_3210 = _mm_mullo_epi32( ATMP_3210, SUBFR_3210 );
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_mm_storeu_si128( (__m128i *)&C_first_row[ k ], FIRST_3210 );
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_mm_storeu_si128( (__m128i *)&C_last_row[ k ], LAST_3210 );
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TMP1_3210 = _mm_add_epi32( TMP1_3210, PTR_3210 );
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TMP2_3210 = _mm_add_epi32( TMP2_3210, SUBFR_3210 );
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}
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TMP1_3210 = _mm_add_epi32( TMP1_3210, _mm_unpackhi_epi64(TMP1_3210, TMP1_3210 ) );
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TMP2_3210 = _mm_add_epi32( TMP2_3210, _mm_unpackhi_epi64(TMP2_3210, TMP2_3210 ) );
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TMP1_3210 = _mm_add_epi32( TMP1_3210, _mm_shufflelo_epi16(TMP1_3210, 0x0E ) );
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TMP2_3210 = _mm_add_epi32( TMP2_3210, _mm_shufflelo_epi16(TMP2_3210, 0x0E ) );
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tmp1 += _mm_cvtsi128_si32( TMP1_3210 );
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tmp2 += _mm_cvtsi128_si32( TMP2_3210 );
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for( ; k < n; k++ ) {
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C_first_row[ k ] = silk_MLA( C_first_row[ k ], x1, x_ptr[ n - k - 1 ] ); /* Q( -rshifts ) */
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C_last_row[ k ] = silk_MLA( C_last_row[ k ], x2, x_ptr[ subfr_length - n + k ] ); /* Q( -rshifts ) */
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Atmp1 = silk_RSHIFT_ROUND( Af_QA[ k ], QA - 17 ); /* Q17 */
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tmp1 = silk_MLA( tmp1, x_ptr[ n - k - 1 ], Atmp1 ); /* Q17 */
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tmp2 = silk_MLA( tmp2, x_ptr[ subfr_length - n + k ], Atmp1 ); /* Q17 */
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}
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tmp1 = -tmp1; /* Q17 */
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tmp2 = -tmp2; /* Q17 */
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{
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__m128i xmm_tmp1, xmm_tmp2;
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__m128i xmm_x_ptr_n_k_x2x0, xmm_x_ptr_n_k_x3x1;
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__m128i xmm_x_ptr_sub_x2x0, xmm_x_ptr_sub_x3x1;
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xmm_tmp1 = _mm_set1_epi32( tmp1 );
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xmm_tmp2 = _mm_set1_epi32( tmp2 );
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for( k = 0; k <= n - 3; k += 4 ) {
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xmm_x_ptr_n_k_x2x0 = OP_CVTEPI16_EPI32_M64( &x_ptr[ n - k - 3 ] );
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xmm_x_ptr_sub_x2x0 = OP_CVTEPI16_EPI32_M64( &x_ptr[ subfr_length - n + k - 1 ] );
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xmm_x_ptr_n_k_x2x0 = _mm_shuffle_epi32( xmm_x_ptr_n_k_x2x0, _MM_SHUFFLE( 0, 1, 2, 3 ) );
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xmm_x_ptr_n_k_x2x0 = _mm_slli_epi32( xmm_x_ptr_n_k_x2x0, -rshifts - 1 );
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xmm_x_ptr_sub_x2x0 = _mm_slli_epi32( xmm_x_ptr_sub_x2x0, -rshifts - 1 );
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/* equal shift right 4 bytes, xmm_x_ptr_n_k_x3x1 = _mm_srli_si128(xmm_x_ptr_n_k_x2x0, 4)*/
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xmm_x_ptr_n_k_x3x1 = _mm_shuffle_epi32( xmm_x_ptr_n_k_x2x0, _MM_SHUFFLE( 0, 3, 2, 1 ) );
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xmm_x_ptr_sub_x3x1 = _mm_shuffle_epi32( xmm_x_ptr_sub_x2x0, _MM_SHUFFLE( 0, 3, 2, 1 ) );
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xmm_x_ptr_n_k_x2x0 = _mm_mul_epi32( xmm_x_ptr_n_k_x2x0, xmm_tmp1 );
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xmm_x_ptr_n_k_x3x1 = _mm_mul_epi32( xmm_x_ptr_n_k_x3x1, xmm_tmp1 );
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xmm_x_ptr_sub_x2x0 = _mm_mul_epi32( xmm_x_ptr_sub_x2x0, xmm_tmp2 );
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xmm_x_ptr_sub_x3x1 = _mm_mul_epi32( xmm_x_ptr_sub_x3x1, xmm_tmp2 );
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xmm_x_ptr_n_k_x2x0 = _mm_srli_epi64( xmm_x_ptr_n_k_x2x0, 16 );
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xmm_x_ptr_n_k_x3x1 = _mm_slli_epi64( xmm_x_ptr_n_k_x3x1, 16 );
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xmm_x_ptr_sub_x2x0 = _mm_srli_epi64( xmm_x_ptr_sub_x2x0, 16 );
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xmm_x_ptr_sub_x3x1 = _mm_slli_epi64( xmm_x_ptr_sub_x3x1, 16 );
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xmm_x_ptr_n_k_x2x0 = _mm_blend_epi16( xmm_x_ptr_n_k_x2x0, xmm_x_ptr_n_k_x3x1, 0xCC );
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xmm_x_ptr_sub_x2x0 = _mm_blend_epi16( xmm_x_ptr_sub_x2x0, xmm_x_ptr_sub_x3x1, 0xCC );
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X1_3210 = _mm_loadu_si128( (__m128i *)&CAf[ k ] );
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PTR_3210 = _mm_loadu_si128( (__m128i *)&CAb[ k ] );
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X1_3210 = _mm_add_epi32( X1_3210, xmm_x_ptr_n_k_x2x0 );
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PTR_3210 = _mm_add_epi32( PTR_3210, xmm_x_ptr_sub_x2x0 );
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_mm_storeu_si128( (__m128i *)&CAf[ k ], X1_3210 );
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_mm_storeu_si128( (__m128i *)&CAb[ k ], PTR_3210 );
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}
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for( ; k <= n; k++ ) {
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CAf[ k ] = silk_SMLAWW( CAf[ k ], tmp1,
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silk_LSHIFT32( (opus_int32)x_ptr[ n - k ], -rshifts - 1 ) ); /* Q( -rshift ) */
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CAb[ k ] = silk_SMLAWW( CAb[ k ], tmp2,
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silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n + k - 1 ], -rshifts - 1 ) ); /* Q( -rshift ) */
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}
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}
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}
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}
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/* Calculate nominator and denominator for the next order reflection (parcor) coefficient */
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tmp1 = C_first_row[ n ]; /* Q( -rshifts ) */
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tmp2 = C_last_row[ n ]; /* Q( -rshifts ) */
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num = 0; /* Q( -rshifts ) */
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nrg = silk_ADD32( CAb[ 0 ], CAf[ 0 ] ); /* Q( 1-rshifts ) */
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for( k = 0; k < n; k++ ) {
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Atmp_QA = Af_QA[ k ];
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lz = silk_CLZ32( silk_abs( Atmp_QA ) ) - 1;
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lz = silk_min( 32 - QA, lz );
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Atmp1 = silk_LSHIFT32( Atmp_QA, lz ); /* Q( QA + lz ) */
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tmp1 = silk_ADD_LSHIFT32( tmp1, silk_SMMUL( C_last_row[ n - k - 1 ], Atmp1 ), 32 - QA - lz ); /* Q( -rshifts ) */
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tmp2 = silk_ADD_LSHIFT32( tmp2, silk_SMMUL( C_first_row[ n - k - 1 ], Atmp1 ), 32 - QA - lz ); /* Q( -rshifts ) */
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num = silk_ADD_LSHIFT32( num, silk_SMMUL( CAb[ n - k ], Atmp1 ), 32 - QA - lz ); /* Q( -rshifts ) */
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nrg = silk_ADD_LSHIFT32( nrg, silk_SMMUL( silk_ADD32( CAb[ k + 1 ], CAf[ k + 1 ] ),
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Atmp1 ), 32 - QA - lz ); /* Q( 1-rshifts ) */
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}
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CAf[ n + 1 ] = tmp1; /* Q( -rshifts ) */
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CAb[ n + 1 ] = tmp2; /* Q( -rshifts ) */
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num = silk_ADD32( num, tmp2 ); /* Q( -rshifts ) */
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num = silk_LSHIFT32( -num, 1 ); /* Q( 1-rshifts ) */
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/* Calculate the next order reflection (parcor) coefficient */
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if( silk_abs( num ) < nrg ) {
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rc_Q31 = silk_DIV32_varQ( num, nrg, 31 );
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} else {
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rc_Q31 = ( num > 0 ) ? silk_int32_MAX : silk_int32_MIN;
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}
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/* Update inverse prediction gain */
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tmp1 = ( (opus_int32)1 << 30 ) - silk_SMMUL( rc_Q31, rc_Q31 );
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tmp1 = silk_LSHIFT( silk_SMMUL( invGain_Q30, tmp1 ), 2 );
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if( tmp1 <= minInvGain_Q30 ) {
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/* Max prediction gain exceeded; set reflection coefficient such that max prediction gain is exactly hit */
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tmp2 = ( (opus_int32)1 << 30 ) - silk_DIV32_varQ( minInvGain_Q30, invGain_Q30, 30 ); /* Q30 */
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rc_Q31 = silk_SQRT_APPROX( tmp2 ); /* Q15 */
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if( rc_Q31 > 0 ) {
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/* Newton-Raphson iteration */
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rc_Q31 = silk_RSHIFT32( rc_Q31 + silk_DIV32( tmp2, rc_Q31 ), 1 ); /* Q15 */
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rc_Q31 = silk_LSHIFT32( rc_Q31, 16 ); /* Q31 */
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if( num < 0 ) {
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/* Ensure adjusted reflection coefficients has the original sign */
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rc_Q31 = -rc_Q31;
|
|
}
|
|
}
|
|
invGain_Q30 = minInvGain_Q30;
|
|
reached_max_gain = 1;
|
|
} else {
|
|
invGain_Q30 = tmp1;
|
|
}
|
|
|
|
/* Update the AR coefficients */
|
|
for( k = 0; k < (n + 1) >> 1; k++ ) {
|
|
tmp1 = Af_QA[ k ]; /* QA */
|
|
tmp2 = Af_QA[ n - k - 1 ]; /* QA */
|
|
Af_QA[ k ] = silk_ADD_LSHIFT32( tmp1, silk_SMMUL( tmp2, rc_Q31 ), 1 ); /* QA */
|
|
Af_QA[ n - k - 1 ] = silk_ADD_LSHIFT32( tmp2, silk_SMMUL( tmp1, rc_Q31 ), 1 ); /* QA */
|
|
}
|
|
Af_QA[ n ] = silk_RSHIFT32( rc_Q31, 31 - QA ); /* QA */
|
|
|
|
if( reached_max_gain ) {
|
|
/* Reached max prediction gain; set remaining coefficients to zero and exit loop */
|
|
for( k = n + 1; k < D; k++ ) {
|
|
Af_QA[ k ] = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Update C * Af and C * Ab */
|
|
for( k = 0; k <= n + 1; k++ ) {
|
|
tmp1 = CAf[ k ]; /* Q( -rshifts ) */
|
|
tmp2 = CAb[ n - k + 1 ]; /* Q( -rshifts ) */
|
|
CAf[ k ] = silk_ADD_LSHIFT32( tmp1, silk_SMMUL( tmp2, rc_Q31 ), 1 ); /* Q( -rshifts ) */
|
|
CAb[ n - k + 1 ] = silk_ADD_LSHIFT32( tmp2, silk_SMMUL( tmp1, rc_Q31 ), 1 ); /* Q( -rshifts ) */
|
|
}
|
|
}
|
|
|
|
if( reached_max_gain ) {
|
|
for( k = 0; k < D; k++ ) {
|
|
/* Scale coefficients */
|
|
A_Q16[ k ] = -silk_RSHIFT_ROUND( Af_QA[ k ], QA - 16 );
|
|
}
|
|
/* Subtract energy of preceding samples from C0 */
|
|
if( rshifts > 0 ) {
|
|
for( s = 0; s < nb_subfr; s++ ) {
|
|
x_ptr = x + s * subfr_length;
|
|
C0 -= (opus_int32)silk_RSHIFT64( silk_inner_prod16_aligned_64( x_ptr, x_ptr, D, arch ), rshifts );
|
|
}
|
|
} else {
|
|
for( s = 0; s < nb_subfr; s++ ) {
|
|
x_ptr = x + s * subfr_length;
|
|
C0 -= silk_LSHIFT32( silk_inner_prod_aligned( x_ptr, x_ptr, D, arch ), -rshifts );
|
|
}
|
|
}
|
|
/* Approximate residual energy */
|
|
*res_nrg = silk_LSHIFT( silk_SMMUL( invGain_Q30, C0 ), 2 );
|
|
*res_nrg_Q = -rshifts;
|
|
} else {
|
|
/* Return residual energy */
|
|
nrg = CAf[ 0 ]; /* Q( -rshifts ) */
|
|
tmp1 = (opus_int32)1 << 16; /* Q16 */
|
|
for( k = 0; k < D; k++ ) {
|
|
Atmp1 = silk_RSHIFT_ROUND( Af_QA[ k ], QA - 16 ); /* Q16 */
|
|
nrg = silk_SMLAWW( nrg, CAf[ k + 1 ], Atmp1 ); /* Q( -rshifts ) */
|
|
tmp1 = silk_SMLAWW( tmp1, Atmp1, Atmp1 ); /* Q16 */
|
|
A_Q16[ k ] = -Atmp1;
|
|
}
|
|
*res_nrg = silk_SMLAWW( nrg, silk_SMMUL( SILK_FIX_CONST( FIND_LPC_COND_FAC, 32 ), C0 ), -tmp1 );/* Q( -rshifts ) */
|
|
*res_nrg_Q = -rshifts;
|
|
}
|
|
}
|