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//#ifdef HAVE_CONFIG_H
#include "../../config.h"
//#endif

#include "main_FIX.h"

#if defined(MIPSr1_ASM)
#include "mips/warped_autocorrelation_FIX_mipsr1.h"
#endif


/* Autocorrelations for a warped frequency axis */
#ifndef OVERRIDE_silk_warped_autocorrelation_FIX_c
void silk_warped_autocorrelation_FIX_c(
    opus_int32                *corr,                                  /* O    Result [order + 1]                                                          */
    opus_int                  *scale,                                 /* O    Scaling of the correlation vector                                           */
    const opus_int16                *input,                                 /* I    Input data to correlate                                                     */
    const opus_int                  warping_Q16,                            /* I    Warping coefficient                                                         */
    const opus_int                  length,                                 /* I    Length of input                                                             */
    const opus_int                  order                                   /* I    Correlation order (even)                                                    */
) {
    opus_int   n, i, lsh;
    opus_int32 tmp1_QS, tmp2_QS;
    opus_int32 *state_QS = (opus_int32*)calloc(MAX_SHAPE_LPC_ORDER + 1, sizeof(opus_int32));
    opus_int64 *corr_QC = (opus_int64*)calloc(MAX_SHAPE_LPC_ORDER + 1, sizeof(opus_int64));

    /* Order must be even */
    celt_assert((order & 1) == 0);
    silk_assert(2 * QS - QC >= 0);

    /* Loop over samples */
    for (n = 0; n < length; n++) {
        tmp1_QS = silk_LSHIFT32((opus_int32)input[ n ], QS);
        /* Loop over allpass sections */
        for (i = 0; i < order; i += 2) {
            /* Output of allpass section */
            tmp2_QS = silk_SMLAWB(state_QS[ i ], state_QS[ i + 1 ] - tmp1_QS, warping_Q16);
            state_QS[ i ]  = tmp1_QS;
            corr_QC[  i ] += silk_RSHIFT64(silk_SMULL(tmp1_QS, state_QS[ 0 ]), 2 * QS - QC);
            /* Output of allpass section */
            tmp1_QS = silk_SMLAWB(state_QS[ i + 1 ], state_QS[ i + 2 ] - tmp2_QS, warping_Q16);
            state_QS[ i + 1 ]  = tmp2_QS;
            corr_QC[  i + 1 ] += silk_RSHIFT64(silk_SMULL(tmp2_QS, state_QS[ 0 ]), 2 * QS - QC);
        }
        state_QS[ order ] = tmp1_QS;
        corr_QC[  order ] += silk_RSHIFT64(silk_SMULL(tmp1_QS, state_QS[ 0 ]), 2 * QS - QC);
    }

    lsh = silk_CLZ64(corr_QC[ 0 ]) - 35;
    lsh = silk_LIMIT(lsh, -12 - QC, 30 - QC);
    *scale = -(QC + lsh);
    silk_assert(*scale >= -30 && *scale <= 12);
    if (lsh >= 0) {
        for (i = 0; i < order + 1; i++) {
            corr[ i ] = (opus_int32)silk_CHECK_FIT32(silk_LSHIFT64(corr_QC[ i ], lsh));
        }
    } else {
        for (i = 0; i < order + 1; i++) {
            corr[ i ] = (opus_int32)silk_CHECK_FIT32(silk_RSHIFT64(corr_QC[ i ], -lsh));
        }
    }
    silk_assert(corr_QC[ 0 ] >= 0);   /* If breaking, decrease QC*/
    free(state_QS);
    free(corr_QC);
}
#endif /* OVERRIDE_silk_warped_autocorrelation_FIX_c */
