/src/opus/silk/x86/NSQ_del_dec_avx2.c

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

#ifdef OPUS_CHECK_ASM
#include <string.h>
#endif

#include "opus_defines.h"
#include <immintrin.h>

#include "main.h"
#include "stack_alloc.h"
#include "NSQ.h"
#include "celt/x86/x86cpu.h"

/* Returns TRUE if all assumptions met */
static OPUS_INLINE int verify_assumptions(const silk_encoder_state *psEncC)
{
    /* This optimization is based on these assumptions        */
    /* These assumptions are fundamental and hence assert are */
    /* used. Should any assert triggers, we have to re-visit  */
    /* all related code to make sure it still functions the   */
    /* same as the C implementation.                          */
    silk_assert(MAX_DEL_DEC_STATES  <= 4      &&
                MAX_FRAME_LENGTH     % 4 == 0 &&
                MAX_SUB_FRAME_LENGTH % 4 == 0 &&
                LTP_MEM_LENGTH_MS    % 4 == 0 );
    silk_assert(psEncC->fs_kHz ==  8 ||
                psEncC->fs_kHz == 12 ||
                psEncC->fs_kHz == 16 );
    silk_assert(psEncC->nb_subfr <= MAX_NB_SUBFR &&
                psEncC->nb_subfr > 0             );
    silk_assert(psEncC->nStatesDelayedDecision <= MAX_DEL_DEC_STATES &&
                psEncC->nStatesDelayedDecision > 0                   );
    silk_assert(psEncC->ltp_mem_length == psEncC->fs_kHz * LTP_MEM_LENGTH_MS);

    /* Regressions were observed on certain AMD Zen CPUs when      */
    /* nStatesDelayedDecision is 1 or 2. Ideally we should detect  */
    /* these CPUs and enable this optimization on others; however, */
    /* there is no good way to do so under current OPUS framework. */
    return psEncC->nStatesDelayedDecision == 3 ||
           psEncC->nStatesDelayedDecision == 4;
}

/* Intrinsics not defined on MSVC */
#ifdef _MSC_VER
#include <intsafe.h>
static inline int __builtin_sadd_overflow(opus_int32 a, opus_int32 b, opus_int32* res)
{
    *res = a+b;
    return (*res ^ a) & (*res ^ b) & 0x80000000;
}
static inline int __builtin_ctz(unsigned int x)
{
    DWORD res = 0;
    return _BitScanForward(&res, x) ? res : 32;
}
#endif

static OPUS_INLINE __m128i silk_cvtepi64_epi32_high(__m256i num)
{
    return _mm256_castsi256_si128(_mm256_permutevar8x32_epi32(num, _mm256_set_epi32(0, 0, 0, 0, 7, 5, 3, 1)));
}

static OPUS_INLINE opus_int16 silk_sat16(opus_int32 num)
{
    num = num > silk_int16_MAX ? silk_int16_MAX : num;
    num = num < silk_int16_MIN ? silk_int16_MIN : num;
    return num;
}

static OPUS_INLINE opus_int32 silk_sar_round_32(opus_int32 a, int bits)
{
    silk_assert(bits > 0 && bits < 31);
    a += 1 << (bits-1);
    return a >> bits;
}

static OPUS_INLINE opus_int64 silk_sar_round_smulww(opus_int32 a, opus_int32 b, int bits)
{
    opus_int64 t;
    silk_assert(bits > 0 && bits < 63);
#ifdef OPUS_CHECK_ASM
    return silk_RSHIFT_ROUND(silk_SMULWW(a, b), bits);
#else
    /* This code is more correct, but it won't overflow like the C code in some rare cases. */
    silk_assert(bits > 0 && bits < 63);
    t = ((opus_int64)a) * ((opus_int64)b);
    bits += 16;
    t += 1ull << (bits-1);
    return t >> bits;
#endif
}

static OPUS_INLINE opus_int32 silk_add_sat32(opus_int32 a, opus_int32 b)
{
    opus_int32 sum;
    if (__builtin_sadd_overflow(a, b, &sum))
    {
        return a >= 0 ? silk_int32_MAX : silk_int32_MIN;
    }
    return sum;
}

static OPUS_INLINE __m128i silk_mm_srai_round_epi32(__m128i a, int bits)
{
    silk_assert(bits > 0 && bits < 31);
    return _mm_srai_epi32(_mm_add_epi32(a, _mm_set1_epi32(1 << (bits - 1))), bits);
}

/* add/subtract with output saturated */
static OPUS_INLINE __m128i silk_mm_add_sat_epi32(__m128i a, __m128i b)
{
    __m128i r = _mm_add_epi32(a, b);
    __m128i OF = _mm_and_si128(_mm_xor_si128(a, r), _mm_xor_si128(b, r));           /* OF = (sum ^ a) & (sum ^ b)   */
    __m128i SAT = _mm_add_epi32(_mm_srli_epi32(a, 31), _mm_set1_epi32(0x7FFFFFFF)); /* SAT = (a >> 31) + 0x7FFFFFFF */
    return _mm_blendv_epi8(r, SAT, _mm_srai_epi32(OF, 31));
}
static OPUS_INLINE __m128i silk_mm_sub_sat_epi32(__m128i a, __m128i b)
{
    __m128i r = _mm_sub_epi32(a, b);
    __m128i OF = _mm_andnot_si128(_mm_xor_si128(b, r), _mm_xor_si128(a, r));        /* OF = (sum ^ a) & (sum ^ ~b) = (sum ^ a) & ~(sum ^ b) */
    __m128i SAT = _mm_add_epi32(_mm_srli_epi32(a, 31), _mm_set1_epi32(0x7FFFFFFF)); /* SAT = (a >> 31) + 0x7FFFFFFF                         */
    return _mm_blendv_epi8(r, SAT, _mm_srai_epi32(OF, 31));
}
static OPUS_INLINE __m256i silk_mm256_sub_sat_epi32(__m256i a, __m256i b)
{
    __m256i r = _mm256_sub_epi32(a, b);
    __m256i OF = _mm256_andnot_si256(_mm256_xor_si256(b, r), _mm256_xor_si256(a, r));        /* OF = (sum ^ a) & (sum ^ ~b) = (sum ^ a) & ~(sum ^ b) */
    __m256i SAT = _mm256_add_epi32(_mm256_srli_epi32(a, 31), _mm256_set1_epi32(0x7FFFFFFF)); /* SAT = (a >> 31) + 0x7FFFFFFF                         */
    return _mm256_blendv_epi8(r, SAT, _mm256_srai_epi32(OF, 31));
}

static OPUS_INLINE __m128i silk_mm_limit_epi32(__m128i num, opus_int32 limit1, opus_int32 limit2)
{
    opus_int32 lo = limit1 < limit2 ? limit1 : limit2;
    opus_int32 hi = limit1 > limit2 ? limit1 : limit2;

    num = _mm_min_epi32(num, _mm_set1_epi32(hi));
    num = _mm_max_epi32(num, _mm_set1_epi32(lo));
    return num;
}

/* cond < 0 ? -num : num */
static OPUS_INLINE __m128i silk_mm_sign_epi32(__m128i num, __m128i cond)
{
    return _mm_sign_epi32(num, _mm_or_si128(cond, _mm_set1_epi32(1)));
}
static OPUS_INLINE __m256i silk_mm256_sign_epi32(__m256i num, __m256i cond)
{
    return _mm256_sign_epi32(num, _mm256_or_si256(cond, _mm256_set1_epi32(1)));
}

/* (a32 * b32) >> 16 */
static OPUS_INLINE __m128i silk_mm_smulww_epi32(__m128i a, opus_int32 b)
{
    return silk_cvtepi64_epi32_high(_mm256_slli_epi64(_mm256_mul_epi32(_mm256_cvtepi32_epi64(a), _mm256_set1_epi32(b)), 16));
}

/* (a32 * (opus_int32)((opus_int16)(b32))) >> 16 output have to be 32bit int */
static OPUS_INLINE __m128i silk_mm_smulwb_epi32(__m128i a, opus_int32 b)
{
    return silk_cvtepi64_epi32_high(_mm256_mul_epi32(_mm256_cvtepi32_epi64(a), _mm256_set1_epi32((opus_uint32)b<<16)));
}

/* (opus_int32)((opus_int16)(a3))) * (opus_int32)((opus_int16)(b32)) output have to be 32bit int */
static OPUS_INLINE __m256i silk_mm256_smulbb_epi32(__m256i a, __m256i b)
{
    const char FF = (char)0xFF;
    __m256i msk = _mm256_set_epi8(
        FF, FF, FF, FF, FF, FF, FF, FF, 13, 12, 9, 8, 5, 4, 1, 0,
        FF, FF, FF, FF, FF, FF, FF, FF, 13, 12, 9, 8, 5, 4, 1, 0);
    __m256i lo = _mm256_mullo_epi16(a, b);
    __m256i hi = _mm256_mulhi_epi16(a, b);
    lo = _mm256_shuffle_epi8(lo, msk);
    hi = _mm256_shuffle_epi8(hi, msk);
    return _mm256_unpacklo_epi16(lo, hi);
}

static OPUS_INLINE __m256i silk_mm256_reverse_epi32(__m256i v)
{
    v = _mm256_shuffle_epi32(v, 0x1B);
    v = _mm256_permute4x64_epi64(v, 0x4E);
    return v;
}

static OPUS_INLINE opus_int32 silk_mm256_hsum_epi32(__m256i v)
{
    __m128i sum = _mm_add_epi32(_mm256_extracti128_si256(v, 1), _mm256_extracti128_si256(v, 0));
    sum = _mm_add_epi32(sum, _mm_shuffle_epi32(sum, 0x4E));
    sum = _mm_add_epi32(sum, _mm_shuffle_epi32(sum, 0xB1));
    return _mm_cvtsi128_si32(sum);
}

static OPUS_INLINE __m128i silk_mm_hmin_epi32(__m128i num)
{
    num = _mm_min_epi32(num, _mm_shuffle_epi32(num, 0x4E)); /* 0123 -> 2301 */
    num = _mm_min_epi32(num, _mm_shuffle_epi32(num, 0xB1)); /* 0123 -> 1032 */
    return num;
}

static OPUS_INLINE __m128i silk_mm_hmax_epi32(__m128i num)
{
    num = _mm_max_epi32(num, _mm_shuffle_epi32(num, 0x4E)); /* 0123 -> 2310 */
    num = _mm_max_epi32(num, _mm_shuffle_epi32(num, 0xB1)); /* 0123 -> 1032 */
    return num;
}

static OPUS_INLINE __m128i silk_mm_mask_hmin_epi32(__m128i num, __m128i mask)
{
    num = _mm_blendv_epi8(num, _mm_set1_epi32(silk_int32_MAX), mask);
    return silk_mm_hmin_epi32(num);
}

static OPUS_INLINE __m128i silk_mm_mask_hmax_epi32(__m128i num, __m128i mask)
{
    num = _mm_blendv_epi8(num, _mm_set1_epi32(silk_int32_MIN), mask);
    return silk_mm_hmax_epi32(num);
}

static OPUS_INLINE __m128i silk_mm256_rand_epi32(__m128i seed)
{
    seed = _mm_mullo_epi32(seed, _mm_set1_epi32(RAND_MULTIPLIER));
    seed = _mm_add_epi32(seed, _mm_set1_epi32(RAND_INCREMENT));
    return seed;
}

static OPUS_INLINE opus_int32 silk_index_of_first_equal_epi32(__m128i a, __m128i b)
{
    unsigned int mask = _mm_movemask_epi8(_mm_cmpeq_epi32(a, b)) & 0x1111;
    silk_assert(mask != 0);
    return __builtin_ctz(mask) >> 2;
}

static __m128i silk_index_to_selector(opus_int32 index)
{
    silk_assert(index < 4);
    index <<= 2;
    return _mm_set_epi8(
        index + 3, index + 2, index + 1, index + 0,
        index + 3, index + 2, index + 1, index + 0,
        index + 3, index + 2, index + 1, index + 0,
        index + 3, index + 2, index + 1, index + 0);
}

static opus_int32 silk_select_winner(__m128i num, __m128i selector)
{
    return _mm_cvtsi128_si32(_mm_shuffle_epi8(num, selector));
}

typedef struct
{
    __m128i RandState;
    __m128i Q_Q10;
    __m128i Xq_Q14;
    __m128i Pred_Q15;
    __m128i Shape_Q14;
} NSQ_del_dec_sample_struct;

typedef struct
{
    __m128i sLPC_Q14[MAX_SUB_FRAME_LENGTH + NSQ_LPC_BUF_LENGTH];
    __m128i LF_AR_Q14;
    __m128i Seed;
    __m128i SeedInit;
    __m128i RD_Q10;
    __m128i Diff_Q14;
    __m128i sAR2_Q14[MAX_SHAPE_LPC_ORDER];
    NSQ_del_dec_sample_struct Samples[DECISION_DELAY];
} NSQ_del_dec_struct;

static OPUS_INLINE void silk_nsq_del_dec_scale_states_avx2(
    const silk_encoder_state *psEncC,          /* I    Encoder State                   */
    silk_nsq_state *NSQ,                       /* I/O  NSQ state                       */
    NSQ_del_dec_struct *psDelDec,              /* I/O  Delayed decision states         */
    const opus_int16 x16[],                    /* I    Input                           */
    opus_int32 x_sc_Q10[MAX_SUB_FRAME_LENGTH], /* O    Input scaled with 1/Gain in Q10 */
    const opus_int16 sLTP[],                   /* I    Re-whitened LTP state in Q0     */
    opus_int32 sLTP_Q15[],                     /* O    LTP state matching scaled input */
    opus_int subfr,                            /* I    Subframe number                 */
    const opus_int LTP_scale_Q14,              /* I    LTP state scaling               */
    const opus_int32 Gains_Q16[MAX_NB_SUBFR],  /* I                                    */
    const opus_int pitchL[MAX_NB_SUBFR],       /* I    Pitch lag                       */
    const opus_int signal_type,                /* I    Signal type                     */
    const opus_int decisionDelay               /* I    Decision delay                  */
);

/*******************************************/
/* LPC analysis filter                     */
/* NB! State is kept internally and the    */
/* filter always starts with zero state    */
/* first d output samples are set to zero  */
/*******************************************/
static OPUS_INLINE void silk_LPC_analysis_filter_avx2(
    opus_int16                  *out,               /* O    Output signal                           */
    const opus_int16            *in,                /* I    Input signal                            */
    const opus_int16            *B,                 /* I    MA prediction coefficients, Q12 [order] */
    const opus_int32            len,                /* I    Signal length                           */
    const opus_int32            order               /* I    Filter order                            */
);

/******************************************/
/* Noise shape quantizer for one subframe */
/******************************************/
static OPUS_INLINE void silk_noise_shape_quantizer_del_dec_avx2(
    silk_nsq_state *NSQ,                        /* I/O  NSQ state                          */
    NSQ_del_dec_struct psDelDec[],              /* I/O  Delayed decision states            */
    opus_int signalType,                        /* I    Signal type                        */
    const opus_int32 x_Q10[],                   /* I                                       */
    opus_int8 pulses[],                         /* O                                       */
    opus_int16 xq[],                            /* O                                       */
    opus_int32 sLTP_Q15[],                      /* I/O  LTP filter state                   */
    opus_int32 delayedGain_Q10[DECISION_DELAY], /* I/O  Gain delay buffer                  */
    const opus_int16 a_Q12[],                   /* I    Short term prediction coefs        */
    const opus_int16 b_Q14[],                   /* I    Long term prediction coefs         */
    const opus_int16 AR_shp_Q13[],              /* I    Noise shaping coefs                */
    opus_int lag,                               /* I    Pitch lag                          */
    opus_int32 HarmShapeFIRPacked_Q14,          /* I                                       */
    opus_int Tilt_Q14,                          /* I    Spectral tilt                      */
    opus_int32 LF_shp_Q14,                      /* I                                       */
    opus_int32 Gain_Q16,                        /* I                                       */
    opus_int Lambda_Q10,                        /* I                                       */
    opus_int offset_Q10,                        /* I                                       */
    opus_int length,                            /* I    Input length                       */
    opus_int subfr,                             /* I    Subframe number                    */
    opus_int shapingLPCOrder,                   /* I    Shaping LPC filter order           */
    opus_int predictLPCOrder,                   /* I    Prediction filter order            */
    opus_int warping_Q16,                       /* I                                       */
    __m128i MaskDelDec,                         /* I    Mask of states in decision tree    */
    opus_int *smpl_buf_idx,                     /* I/O  Index to newest samples in buffers */
    opus_int decisionDelay                      /* I                                       */
);

void silk_NSQ_del_dec_avx2(
    const silk_encoder_state *psEncC,                            /* I    Encoder State               */
    silk_nsq_state *NSQ,                                         /* I/O  NSQ state                   */
    SideInfoIndices *psIndices,                                  /* I/O  Quantization Indices        */
    const opus_int16 x16[],                                      /* I    Input                       */
    opus_int8 pulses[],                                          /* O    Quantized pulse signal      */
    const opus_int16 *PredCoef_Q12,                              /* I    Short term prediction coefs */
    const opus_int16 LTPCoef_Q14[LTP_ORDER * MAX_NB_SUBFR],      /* I    Long term prediction coefs  */
    const opus_int16 AR_Q13[MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER], /* I    Noise shaping coefs         */
    const opus_int HarmShapeGain_Q14[MAX_NB_SUBFR],              /* I    Long term shaping coefs     */
    const opus_int Tilt_Q14[MAX_NB_SUBFR],                       /* I    Spectral tilt               */
    const opus_int32 LF_shp_Q14[MAX_NB_SUBFR],                   /* I    Low frequency shaping coefs */
    const opus_int32 Gains_Q16[MAX_NB_SUBFR],                    /* I    Quantization step sizes     */
    const opus_int32 pitchL[MAX_NB_SUBFR],                       /* I    Pitch lags                  */
    const opus_int Lambda_Q10,                                   /* I    Rate/distortion tradeoff    */
    const opus_int LTP_scale_Q14                                 /* I    LTP state scaling           */
)
{
#ifdef OPUS_CHECK_ASM
    silk_nsq_state NSQ_c;
    SideInfoIndices psIndices_c;
    opus_int8 pulses_c[MAX_FRAME_LENGTH];
    const opus_int8 *const pulses_a = pulses;

    silk_memcpy(&NSQ_c, NSQ, sizeof(NSQ_c));
    silk_memcpy(&psIndices_c, psIndices, sizeof(psIndices_c));
    silk_memcpy(pulses_c, pulses, sizeof(pulses_c));
    silk_NSQ_del_dec_c(psEncC, &NSQ_c, &psIndices_c, x16, pulses_c, PredCoef_Q12, LTPCoef_Q14, AR_Q13, HarmShapeGain_Q14, Tilt_Q14, LF_shp_Q14, Gains_Q16,
                       pitchL, Lambda_Q10, LTP_scale_Q14);
#endif

    if (!verify_assumptions(psEncC))
    {
        silk_NSQ_del_dec_c(psEncC, NSQ, psIndices, x16, pulses, PredCoef_Q12, LTPCoef_Q14, AR_Q13, HarmShapeGain_Q14, Tilt_Q14, LF_shp_Q14, Gains_Q16, pitchL, Lambda_Q10, LTP_scale_Q14);
        return;
    }

    opus_int i, k, lag, start_idx, LSF_interpolation_flag, Winner_ind, subfr;
    opus_int last_smple_idx, smpl_buf_idx, decisionDelay;
    const opus_int16 *A_Q12, *B_Q14, *AR_shp_Q13;
    opus_int16 *pxq;
    VARDECL(opus_int32, sLTP_Q15);
    VARDECL(opus_int16, sLTP);
    opus_int32 HarmShapeFIRPacked_Q14;
    opus_int offset_Q10;
    opus_int32 Gain_Q10;
    opus_int32 x_sc_Q10[MAX_SUB_FRAME_LENGTH];
    opus_int32 delayedGain_Q10[DECISION_DELAY];
    NSQ_del_dec_struct psDelDec = {0};
    NSQ_del_dec_sample_struct *psSample;
    __m128i RDmin_Q10, MaskDelDec, Winner_selector;
    SAVE_STACK;

    MaskDelDec = _mm_cvtepi8_epi32(_mm_cvtsi32_si128(0xFFFFFF00ul << ((psEncC->nStatesDelayedDecision - 1) << 3)));

    /* Set unvoiced lag to the previous one, overwrite later for voiced */
    lag = NSQ->lagPrev;

    silk_assert(NSQ->prev_gain_Q16 != 0);
    psDelDec.Seed = _mm_and_si128(
        _mm_add_epi32(_mm_set_epi32(3, 2, 1, 0), _mm_set1_epi32(psIndices->Seed)),
        _mm_set1_epi32(3));
    psDelDec.SeedInit = psDelDec.Seed;
    psDelDec.RD_Q10 = _mm_setzero_si128();
    psDelDec.LF_AR_Q14 = _mm_set1_epi32(NSQ->sLF_AR_shp_Q14);
    psDelDec.Diff_Q14 = _mm_set1_epi32(NSQ->sDiff_shp_Q14);
    psDelDec.Samples[0].Shape_Q14 = _mm_set1_epi32(NSQ->sLTP_shp_Q14[psEncC->ltp_mem_length - 1]);
    for (i = 0; i < NSQ_LPC_BUF_LENGTH; i++)
    {
        psDelDec.sLPC_Q14[i] = _mm_set1_epi32(NSQ->sLPC_Q14[i]);
    }
    for (i = 0; i < MAX_SHAPE_LPC_ORDER; i++)
    {
        psDelDec.sAR2_Q14[i] = _mm_set1_epi32(NSQ->sAR2_Q14[i]);
    }

    offset_Q10 = silk_Quantization_Offsets_Q10[psIndices->signalType >> 1][psIndices->quantOffsetType];
    smpl_buf_idx = 0; /* index of oldest samples */

    decisionDelay = silk_min_int(DECISION_DELAY, psEncC->subfr_length);

    /* For voiced frames limit the decision delay to lower than the pitch lag */
    if (psIndices->signalType == TYPE_VOICED)
    {
        for (k = 0; k < psEncC->nb_subfr; k++)
        {
            decisionDelay = silk_min_int(decisionDelay, pitchL[k] - LTP_ORDER / 2 - 1);
        }
    }
    else
    {
        if (lag > 0)
        {
            decisionDelay = silk_min_int(decisionDelay, lag - LTP_ORDER / 2 - 1);
        }
    }

    if (psIndices->NLSFInterpCoef_Q2 == 4)
    {
        LSF_interpolation_flag = 0;
    }
    else
    {
        LSF_interpolation_flag = 1;
    }

    ALLOC(sLTP_Q15, psEncC->ltp_mem_length + psEncC->frame_length, opus_int32);
    ALLOC(sLTP, psEncC->ltp_mem_length + psEncC->frame_length, opus_int16);
    /* Set up pointers to start of sub frame */
    pxq = &NSQ->xq[psEncC->ltp_mem_length];
    NSQ->sLTP_shp_buf_idx = psEncC->ltp_mem_length;
    NSQ->sLTP_buf_idx = psEncC->ltp_mem_length;
    subfr = 0;
    for (k = 0; k < psEncC->nb_subfr; k++)
    {
        A_Q12 = &PredCoef_Q12[((k >> 1) | (1 ^ LSF_interpolation_flag)) * MAX_LPC_ORDER];
        B_Q14 = &LTPCoef_Q14[k * LTP_ORDER];
        AR_shp_Q13 = &AR_Q13[k * MAX_SHAPE_LPC_ORDER];

        /* Noise shape parameters */
        silk_assert(HarmShapeGain_Q14[k] >= 0);
        HarmShapeFIRPacked_Q14  =                          silk_RSHIFT( HarmShapeGain_Q14[ k ], 2 );
        HarmShapeFIRPacked_Q14 |= silk_LSHIFT( (opus_int32)silk_RSHIFT( HarmShapeGain_Q14[ k ], 1 ), 16 );

        NSQ->rewhite_flag = 0;
        if (psIndices->signalType == TYPE_VOICED)
        {
            /* Voiced */
            lag = pitchL[k];

            /* Re-whitening */
            if ((k & (3 ^ (LSF_interpolation_flag << 1))) == 0)
            {
                if (k == 2)
                {
                    /* RESET DELAYED DECISIONS */
                    /* Find winner */
                    RDmin_Q10 = silk_mm_mask_hmin_epi32(psDelDec.RD_Q10, MaskDelDec);
                    Winner_ind = silk_index_of_first_equal_epi32(RDmin_Q10, psDelDec.RD_Q10);
                    Winner_selector = silk_index_to_selector(Winner_ind);
                    psDelDec.RD_Q10 = _mm_add_epi32(
                        psDelDec.RD_Q10,
                        _mm_blendv_epi8(
                            _mm_set1_epi32(silk_int32_MAX >> 4),
                            _mm_setzero_si128(),
                            _mm_cvtepi8_epi32(_mm_cvtsi32_si128(0xFFU << (unsigned)(Winner_ind << 3)))));

                    /* Copy final part of signals from winner state to output and long-term filter states */
                    last_smple_idx = smpl_buf_idx + decisionDelay;
                    for (i = 0; i < decisionDelay; i++)
                    {
                        last_smple_idx = (last_smple_idx + DECISION_DELAY - 1) % DECISION_DELAY;
                        psSample = &psDelDec.Samples[last_smple_idx];
                        pulses[i - decisionDelay] =
                            (opus_int8)silk_sar_round_32(silk_select_winner(psSample->Q_Q10, Winner_selector), 10);
                        pxq[i - decisionDelay] =
                            silk_sat16((opus_int32)silk_sar_round_smulww(silk_select_winner(psSample->Xq_Q14, Winner_selector), Gains_Q16[1], 14));
                        NSQ->sLTP_shp_Q14[NSQ->sLTP_shp_buf_idx - decisionDelay + i] =
                            silk_select_winner(psSample->Shape_Q14, Winner_selector);
                    }

                    subfr = 0;
                }

                /* Rewhiten with new A coefs */
                start_idx = psEncC->ltp_mem_length - lag - psEncC->predictLPCOrder - LTP_ORDER / 2;
                silk_assert(start_idx > 0);

                silk_LPC_analysis_filter_avx2(&sLTP[start_idx], &NSQ->xq[start_idx + k * psEncC->subfr_length],
                                              A_Q12, psEncC->ltp_mem_length - start_idx, psEncC->predictLPCOrder);

                NSQ->sLTP_buf_idx = psEncC->ltp_mem_length;
                NSQ->rewhite_flag = 1;
            }
        }

        silk_nsq_del_dec_scale_states_avx2(psEncC, NSQ, &psDelDec, x16, x_sc_Q10, sLTP, sLTP_Q15, k,
                                           LTP_scale_Q14, Gains_Q16, pitchL, psIndices->signalType, decisionDelay);

        silk_noise_shape_quantizer_del_dec_avx2(NSQ, &psDelDec, psIndices->signalType, x_sc_Q10, pulses, pxq, sLTP_Q15,
                                                delayedGain_Q10, A_Q12, B_Q14, AR_shp_Q13, lag, HarmShapeFIRPacked_Q14, Tilt_Q14[k], LF_shp_Q14[k],
                                                Gains_Q16[k], Lambda_Q10, offset_Q10, psEncC->subfr_length, subfr++, psEncC->shapingLPCOrder,
                                                psEncC->predictLPCOrder, psEncC->warping_Q16, MaskDelDec, &smpl_buf_idx, decisionDelay);

        x16 += psEncC->subfr_length;
        pulses += psEncC->subfr_length;
        pxq += psEncC->subfr_length;
    }

    /* Find winner */
    RDmin_Q10 = silk_mm_mask_hmin_epi32(psDelDec.RD_Q10, MaskDelDec);
    Winner_selector = silk_index_to_selector(silk_index_of_first_equal_epi32(RDmin_Q10, psDelDec.RD_Q10));

    /* Copy final part of signals from winner state to output and long-term filter states */
    psIndices->Seed = silk_select_winner(psDelDec.SeedInit, Winner_selector);
    last_smple_idx = smpl_buf_idx + decisionDelay;
    Gain_Q10 = Gains_Q16[psEncC->nb_subfr - 1] >> 6;
    for (i = 0; i < decisionDelay; i++)
    {
        last_smple_idx = (last_smple_idx + DECISION_DELAY - 1) % DECISION_DELAY;
        psSample = &psDelDec.Samples[last_smple_idx];

        pulses[i - decisionDelay] =
            (opus_int8)silk_sar_round_32(silk_select_winner(psSample->Q_Q10, Winner_selector), 10);
        pxq[i - decisionDelay] =
            silk_sat16((opus_int32)silk_sar_round_smulww(silk_select_winner(psSample->Xq_Q14, Winner_selector), Gain_Q10, 8));
        NSQ->sLTP_shp_Q14[NSQ->sLTP_shp_buf_idx - decisionDelay + i] =
            silk_select_winner(psSample->Shape_Q14, Winner_selector);
    }
    for (i = 0; i < NSQ_LPC_BUF_LENGTH; i++)
    {
        NSQ->sLPC_Q14[i] = silk_select_winner(psDelDec.sLPC_Q14[i], Winner_selector);
    }
    for (i = 0; i < MAX_SHAPE_LPC_ORDER; i++)
    {
        NSQ->sAR2_Q14[i] = silk_select_winner(psDelDec.sAR2_Q14[i], Winner_selector);
    }

    /* Update states */
    NSQ->sLF_AR_shp_Q14 = silk_select_winner(psDelDec.LF_AR_Q14, Winner_selector);
    NSQ->sDiff_shp_Q14 = silk_select_winner(psDelDec.Diff_Q14, Winner_selector);
    NSQ->lagPrev = pitchL[psEncC->nb_subfr - 1];

    /* Save quantized speech signal */
    silk_memmove(NSQ->xq, &NSQ->xq[psEncC->frame_length], psEncC->ltp_mem_length * sizeof(opus_int16));
    silk_memmove(NSQ->sLTP_shp_Q14, &NSQ->sLTP_shp_Q14[psEncC->frame_length], psEncC->ltp_mem_length * sizeof(opus_int32));

#ifdef OPUS_CHECK_ASM
    silk_assert(!memcmp(&NSQ_c, NSQ, sizeof(NSQ_c)));
    silk_assert(!memcmp(&psIndices_c, psIndices, sizeof(psIndices_c)));
    silk_assert(!memcmp(pulses_c, pulses_a, sizeof(pulses_c)));
#endif

    RESTORE_STACK;
}

static OPUS_INLINE __m128i silk_noise_shape_quantizer_short_prediction_x4(const __m128i *buf32, const opus_int16 *coef16, opus_int order)
{
    __m256i out;
    silk_assert(order == 10 || order == 16);

    /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
    out = _mm256_set1_epi32(order >> 1);
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-0]), _mm256_set1_epi32(silk_LSHIFT(coef16[0], 16)))); /* High DWORD */
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-1]), _mm256_set1_epi32(silk_LSHIFT(coef16[1], 16)))); /* High DWORD */
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-2]), _mm256_set1_epi32(silk_LSHIFT(coef16[2], 16)))); /* High DWORD */
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-3]), _mm256_set1_epi32(silk_LSHIFT(coef16[3], 16)))); /* High DWORD */
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-4]), _mm256_set1_epi32(silk_LSHIFT(coef16[4], 16)))); /* High DWORD */
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-5]), _mm256_set1_epi32(silk_LSHIFT(coef16[5], 16)))); /* High DWORD */
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-6]), _mm256_set1_epi32(silk_LSHIFT(coef16[6], 16)))); /* High DWORD */
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-7]), _mm256_set1_epi32(silk_LSHIFT(coef16[7], 16)))); /* High DWORD */
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-8]), _mm256_set1_epi32(silk_LSHIFT(coef16[8], 16)))); /* High DWORD */
    out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-9]), _mm256_set1_epi32(silk_LSHIFT(coef16[9], 16)))); /* High DWORD */

    if (order == 16)
    {
        out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-10]), _mm256_set1_epi32(silk_LSHIFT(coef16[10], 16)))); /* High DWORD */
        out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-11]), _mm256_set1_epi32(silk_LSHIFT(coef16[11], 16)))); /* High DWORD */
        out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-12]), _mm256_set1_epi32(silk_LSHIFT(coef16[12], 16)))); /* High DWORD */
        out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-13]), _mm256_set1_epi32(silk_LSHIFT(coef16[13], 16)))); /* High DWORD */
        out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-14]), _mm256_set1_epi32(silk_LSHIFT(coef16[14], 16)))); /* High DWORD */
        out = _mm256_add_epi32(out, _mm256_mul_epi32(_mm256_cvtepi32_epi64(buf32[-15]), _mm256_set1_epi32(silk_LSHIFT(coef16[15], 16)))); /* High DWORD */
    }
    return silk_cvtepi64_epi32_high(out);
}

/******************************************/
/* Noise shape quantizer for one subframe */
/******************************************/
static OPUS_INLINE void silk_noise_shape_quantizer_del_dec_avx2(
    silk_nsq_state *NSQ,                        /* I/O  NSQ state                          */
    NSQ_del_dec_struct *psDelDec,               /* I/O  Delayed decision states            */
    opus_int signalType,                        /* I    Signal type                        */
    const opus_int32 x_Q10[],                   /* I                                       */
    opus_int8 pulses[],                         /* O                                       */
    opus_int16 xq[],                            /* O                                       */
    opus_int32 sLTP_Q15[],                      /* I/O  LTP filter state                   */
    opus_int32 delayedGain_Q10[DECISION_DELAY], /* I/O  Gain delay buffer                  */
    const opus_int16 a_Q12[],                   /* I    Short term prediction coefs        */
    const opus_int16 b_Q14[],                   /* I    Long term prediction coefs         */
    const opus_int16 AR_shp_Q13[],              /* I    Noise shaping coefs                */
    opus_int lag,                               /* I    Pitch lag                          */
    opus_int32 HarmShapeFIRPacked_Q14,          /* I                                       */
    opus_int Tilt_Q14,                          /* I    Spectral tilt                      */
    opus_int32 LF_shp_Q14,                      /* I                                       */
    opus_int32 Gain_Q16,                        /* I                                       */
    opus_int Lambda_Q10,                        /* I                                       */
    opus_int offset_Q10,                        /* I                                       */
    opus_int length,                            /* I    Input length                       */
    opus_int subfr,                             /* I    Subframe number                    */
    opus_int shapingLPCOrder,                   /* I    Shaping LPC filter order           */
    opus_int predictLPCOrder,                   /* I    Prediction filter order            */
    opus_int warping_Q16,                       /* I                                       */
    __m128i MaskDelDec,                         /* I    Mask of states in decision tree    */
    opus_int *smpl_buf_idx,                     /* I/O  Index to newest samples in buffers */
    opus_int decisionDelay                      /* I                                       */
)
{
    int i;
    opus_int32 *shp_lag_ptr = &NSQ->sLTP_shp_Q14[NSQ->sLTP_shp_buf_idx - lag + HARM_SHAPE_FIR_TAPS / 2];
    opus_int32 *pred_lag_ptr = &sLTP_Q15[NSQ->sLTP_buf_idx - lag + LTP_ORDER / 2];
    opus_int32 Gain_Q10 = Gain_Q16 >> 6;

    for (i = 0; i < length; i++)
    {
        /* Perform common calculations used in all states */
        /* NSQ_sample_struct */
        /* Low  128 bits => 1st set */
        /* High 128 bits => 2nd set */
        int j;
        __m256i SS_Q_Q10;
        __m256i SS_RD_Q10;
        __m256i SS_xq_Q14;
        __m256i SS_LF_AR_Q14;
        __m256i SS_Diff_Q14;
        __m256i SS_sLTP_shp_Q14;
        __m256i SS_LPC_exc_Q14;
        __m256i exc_Q14;
        __m256i q_Q10, rr_Q10, rd_Q10;
        __m256i mask;
        __m128i LPC_pred_Q14, n_AR_Q14;
        __m128i RDmin_Q10, RDmax_Q10;
        __m128i n_LF_Q14;
        __m128i r_Q10, q1_Q0, q1_Q10, q2_Q10;
        __m128i Winner_rand_state, Winner_selector;
        __m128i tmp0, tmp1;
        NSQ_del_dec_sample_struct *psLastSample, *psSample;
        opus_int32 RDmin_ind, RDmax_ind, last_smple_idx;
        opus_int32 LTP_pred_Q14, n_LTP_Q14;

        /* Long-term prediction */
        if (signalType == TYPE_VOICED)
        {
            /* Unrolled loop */
            /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
            LTP_pred_Q14 = 2;
            LTP_pred_Q14 += silk_SMULWB(pred_lag_ptr[-0], b_Q14[0]);
            LTP_pred_Q14 += silk_SMULWB(pred_lag_ptr[-1], b_Q14[1]);
            LTP_pred_Q14 += silk_SMULWB(pred_lag_ptr[-2], b_Q14[2]);
            LTP_pred_Q14 += silk_SMULWB(pred_lag_ptr[-3], b_Q14[3]);
            LTP_pred_Q14 += silk_SMULWB(pred_lag_ptr[-4], b_Q14[4]);
            LTP_pred_Q14 = silk_LSHIFT(LTP_pred_Q14, 1); /* Q13 -> Q14 */
            pred_lag_ptr++;
        }
        else
        {
            LTP_pred_Q14 = 0;
        }

        /* Long-term shaping */
        if (lag > 0)
        {
            /* Symmetric, packed FIR coefficients */
            n_LTP_Q14 = silk_add_sat32(shp_lag_ptr[0], shp_lag_ptr[-2]);
            n_LTP_Q14 = silk_SMULWB(n_LTP_Q14, HarmShapeFIRPacked_Q14);
            n_LTP_Q14 = n_LTP_Q14 + silk_SMULWT(shp_lag_ptr[-1], HarmShapeFIRPacked_Q14);
            n_LTP_Q14 = LTP_pred_Q14 - (silk_LSHIFT(n_LTP_Q14, 2)); /* Q12 -> Q14 */
            shp_lag_ptr++;
        }
        else
        {
            n_LTP_Q14 = 0;
        }

        /* BEGIN Updating Delayed Decision States */

        /* Generate dither */
        psDelDec->Seed = silk_mm256_rand_epi32(psDelDec->Seed);

        /* Short-term prediction */
        LPC_pred_Q14 = silk_noise_shape_quantizer_short_prediction_x4(&psDelDec->sLPC_Q14[NSQ_LPC_BUF_LENGTH - 1 + i], a_Q12, predictLPCOrder);
        LPC_pred_Q14 = _mm_slli_epi32(LPC_pred_Q14, 4); /* Q10 -> Q14 */

        /* Noise shape feedback */
        silk_assert(shapingLPCOrder > 0);
        silk_assert((shapingLPCOrder & 1) == 0); /* check that order is even */
        /* Output of lowpass section */
        tmp0 = _mm_add_epi32(psDelDec->Diff_Q14, silk_mm_smulwb_epi32(psDelDec->sAR2_Q14[0], warping_Q16));
        n_AR_Q14 = _mm_set1_epi32(shapingLPCOrder >> 1);
        for (j = 0; j < shapingLPCOrder - 1; j++)
        {
            /* Output of allpass section */
            tmp1 = psDelDec->sAR2_Q14[j];
            psDelDec->sAR2_Q14[j] = tmp0;
            n_AR_Q14 = _mm_add_epi32(n_AR_Q14, silk_mm_smulwb_epi32(tmp0, AR_shp_Q13[j]));
            tmp0 = _mm_add_epi32(tmp1, silk_mm_smulwb_epi32(_mm_sub_epi32(psDelDec->sAR2_Q14[j + 1], tmp0), warping_Q16));
        }
        psDelDec->sAR2_Q14[shapingLPCOrder - 1] = tmp0;
        n_AR_Q14 = _mm_add_epi32(n_AR_Q14, silk_mm_smulwb_epi32(tmp0, AR_shp_Q13[shapingLPCOrder - 1]));

        n_AR_Q14 = _mm_slli_epi32(n_AR_Q14, 1);                                                  /* Q11 -> Q12 */
        n_AR_Q14 = _mm_add_epi32(n_AR_Q14, silk_mm_smulwb_epi32(psDelDec->LF_AR_Q14, Tilt_Q14)); /* Q12 */
        n_AR_Q14 = _mm_slli_epi32(n_AR_Q14, 2);                                                  /* Q12 -> Q14 */

        tmp0 = silk_mm_smulwb_epi32(psDelDec->Samples[*smpl_buf_idx].Shape_Q14, LF_shp_Q14); /* Q12 */
        tmp1 = silk_mm_smulwb_epi32(psDelDec->LF_AR_Q14, LF_shp_Q14 >> 16);                  /* Q12 */
        n_LF_Q14 = _mm_add_epi32(tmp0, tmp1);                                                /* Q12 */
        n_LF_Q14 = _mm_slli_epi32(n_LF_Q14, 2);                                              /* Q12 -> Q14 */

        /* Input minus prediction plus noise feedback                       */
        /* r = x[ i ] - LTP_pred - LPC_pred + n_AR + n_Tilt + n_LF + n_LTP  */
        tmp0 = silk_mm_add_sat_epi32(n_AR_Q14, n_LF_Q14);              /* Q14 */
        tmp1 = _mm_add_epi32(_mm_set1_epi32(n_LTP_Q14), LPC_pred_Q14); /* Q13 */
        tmp0 = silk_mm_sub_sat_epi32(tmp1, tmp0);                      /* Q13 */
        tmp0 = silk_mm_srai_round_epi32(tmp0, 4);                      /* Q10 */

        r_Q10 = _mm_sub_epi32(_mm_set1_epi32(x_Q10[i]), tmp0); /* residual error Q10 */

        /* Flip sign depending on dither */
        r_Q10 = silk_mm_sign_epi32(r_Q10, psDelDec->Seed);
        r_Q10 = silk_mm_limit_epi32(r_Q10, -(31 << 10), 30 << 10);

        /* Find two quantization level candidates and measure their rate-distortion */
        q1_Q10 = _mm_sub_epi32(r_Q10, _mm_set1_epi32(offset_Q10));
        q1_Q0 = _mm_srai_epi32(q1_Q10, 10);
        if (Lambda_Q10 > 2048)
        {
            /* For aggressive RDO, the bias becomes more than one pulse. */
            tmp0 = _mm_sub_epi32(_mm_abs_epi32(q1_Q10), _mm_set1_epi32(Lambda_Q10 / 2 - 512)); /* rdo_offset */
            q1_Q0 = _mm_srai_epi32(q1_Q10, 31);
            tmp1 = _mm_cmpgt_epi32(tmp0, _mm_setzero_si128());
            tmp0 = _mm_srai_epi32(silk_mm_sign_epi32(tmp0, q1_Q10), 10);
            q1_Q0 = _mm_blendv_epi8(q1_Q0, tmp0, tmp1);
        }

        tmp0 = _mm_sign_epi32(_mm_set1_epi32(QUANT_LEVEL_ADJUST_Q10), q1_Q0);
        q1_Q10 = _mm_sub_epi32(_mm_slli_epi32(q1_Q0, 10), tmp0);
        q1_Q10 = _mm_add_epi32(q1_Q10, _mm_set1_epi32(offset_Q10));

        /* check if q1_Q0 is 0 or -1 */
        tmp0 = _mm_add_epi32(_mm_srli_epi32(q1_Q0, 31), q1_Q0);
        tmp1 = _mm_cmpeq_epi32(tmp0, _mm_setzero_si128());
        tmp0 = _mm_blendv_epi8(_mm_set1_epi32(1024), _mm_set1_epi32(1024 - QUANT_LEVEL_ADJUST_Q10), tmp1);
        q2_Q10 = _mm_add_epi32(q1_Q10, tmp0);
        q_Q10 = _mm256_set_m128i(q2_Q10, q1_Q10);

        rr_Q10 = _mm256_sub_epi32(_mm256_broadcastsi128_si256(r_Q10), q_Q10);
        rd_Q10 = _mm256_abs_epi32(q_Q10);
        rr_Q10 = silk_mm256_smulbb_epi32(rr_Q10, rr_Q10);
        rd_Q10 = silk_mm256_smulbb_epi32(rd_Q10, _mm256_set1_epi32(Lambda_Q10));
        rd_Q10 = _mm256_add_epi32(rd_Q10, rr_Q10);
        rd_Q10 = _mm256_srai_epi32(rd_Q10, 10);

        mask = _mm256_broadcastsi128_si256(_mm_cmplt_epi32(_mm256_extracti128_si256(rd_Q10, 0), _mm256_extracti128_si256(rd_Q10, 1)));
        SS_RD_Q10 = _mm256_add_epi32(
            _mm256_broadcastsi128_si256(psDelDec->RD_Q10),
            _mm256_blendv_epi8(
                _mm256_permute2x128_si256(rd_Q10, rd_Q10, 0x1),
                rd_Q10,
                mask));
        SS_Q_Q10 = _mm256_blendv_epi8(
            _mm256_permute2x128_si256(q_Q10, q_Q10, 0x1),
            q_Q10,
            mask);

        /* Update states for best and second best quantization */

        /* Quantized excitation */
        exc_Q14 = silk_mm256_sign_epi32(_mm256_slli_epi32(SS_Q_Q10, 4), _mm256_broadcastsi128_si256(psDelDec->Seed));

        /* Add predictions */
        exc_Q14 = _mm256_add_epi32(exc_Q14, _mm256_set1_epi32(LTP_pred_Q14));
        SS_LPC_exc_Q14 = _mm256_slli_epi32(exc_Q14, 1);
        SS_xq_Q14 = _mm256_add_epi32(exc_Q14, _mm256_broadcastsi128_si256(LPC_pred_Q14));

        /* Update states */
        SS_Diff_Q14 = _mm256_sub_epi32(SS_xq_Q14, _mm256_set1_epi32(silk_LSHIFT(x_Q10[i], 4)));
        SS_LF_AR_Q14 = _mm256_sub_epi32(SS_Diff_Q14, _mm256_broadcastsi128_si256(n_AR_Q14));
        SS_sLTP_shp_Q14 = silk_mm256_sub_sat_epi32(SS_LF_AR_Q14, _mm256_broadcastsi128_si256(n_LF_Q14));

        /* END Updating Delayed Decision States */

        *smpl_buf_idx = (*smpl_buf_idx + DECISION_DELAY - 1) % DECISION_DELAY;
        last_smple_idx = (*smpl_buf_idx + decisionDelay) % DECISION_DELAY;
        psLastSample = &psDelDec->Samples[last_smple_idx];

        /* Find winner */
        RDmin_Q10 = silk_mm_mask_hmin_epi32(_mm256_castsi256_si128(SS_RD_Q10), MaskDelDec);
        Winner_selector = silk_index_to_selector(silk_index_of_first_equal_epi32(RDmin_Q10, _mm256_castsi256_si128(SS_RD_Q10)));

        /* Increase RD values of expired states */
        Winner_rand_state = _mm_shuffle_epi8(psLastSample->RandState, Winner_selector);

        SS_RD_Q10 = _mm256_blendv_epi8(
            _mm256_add_epi32(SS_RD_Q10, _mm256_set1_epi32(silk_int32_MAX >> 4)),
            SS_RD_Q10,
            _mm256_broadcastsi128_si256(_mm_cmpeq_epi32(psLastSample->RandState, Winner_rand_state)));

        /* find worst in first set */
        RDmax_Q10 = silk_mm_mask_hmax_epi32(_mm256_extracti128_si256(SS_RD_Q10, 0), MaskDelDec);
        /* find best in second set */
        RDmin_Q10 = silk_mm_mask_hmin_epi32(_mm256_extracti128_si256(SS_RD_Q10, 1), MaskDelDec);

        /* Replace a state if best from second set outperforms worst in first set */
        tmp0 = _mm_cmplt_epi32(RDmin_Q10, RDmax_Q10);
        if (!_mm_test_all_zeros(tmp0, tmp0))
        {
            int t;
            RDmax_ind = silk_index_of_first_equal_epi32(RDmax_Q10, _mm256_extracti128_si256(SS_RD_Q10, 0));
            RDmin_ind = silk_index_of_first_equal_epi32(RDmin_Q10, _mm256_extracti128_si256(SS_RD_Q10, 1));
            tmp1 = _mm_cvtepi8_epi32(_mm_cvtsi32_si128(0xFFU << (unsigned)(RDmax_ind << 3)));
            tmp0 = _mm_blendv_epi8(
                _mm_set_epi8(0xF, 0xE, 0xD, 0xC, 0xB, 0xA, 0x9, 0x8, 0x7, 0x6, 0x5, 0x4, 0x3, 0x2, 0x1, 0x0),
                silk_index_to_selector(RDmin_ind),
                tmp1);
            for (t = i; t < MAX_SUB_FRAME_LENGTH + NSQ_LPC_BUF_LENGTH; t++)
            {
                psDelDec->sLPC_Q14[t] = _mm_shuffle_epi8(psDelDec->sLPC_Q14[t], tmp0);
            }
            psDelDec->Seed = _mm_shuffle_epi8(psDelDec->Seed, tmp0);
            psDelDec->SeedInit = _mm_shuffle_epi8(psDelDec->SeedInit, tmp0);
            for (t = 0; t < MAX_SHAPE_LPC_ORDER; t++)
            {
                psDelDec->sAR2_Q14[t] = _mm_shuffle_epi8(psDelDec->sAR2_Q14[t], tmp0);
            }
            for (t = 0; t < DECISION_DELAY; t++)
            {
                psDelDec->Samples[t].RandState = _mm_shuffle_epi8(psDelDec->Samples[t].RandState, tmp0);
                psDelDec->Samples[t].Q_Q10 = _mm_shuffle_epi8(psDelDec->Samples[t].Q_Q10, tmp0);
                psDelDec->Samples[t].Xq_Q14 = _mm_shuffle_epi8(psDelDec->Samples[t].Xq_Q14, tmp0);
                psDelDec->Samples[t].Pred_Q15 = _mm_shuffle_epi8(psDelDec->Samples[t].Pred_Q15, tmp0);
                psDelDec->Samples[t].Shape_Q14 = _mm_shuffle_epi8(psDelDec->Samples[t].Shape_Q14, tmp0);
            }
            mask = _mm256_castsi128_si256(_mm_blendv_epi8(_mm_set_epi32(0x3, 0x2, 0x1, 0x0), _mm_set1_epi32(RDmin_ind + 4), tmp1));
            SS_Q_Q10 = _mm256_permutevar8x32_epi32(SS_Q_Q10, mask);
            SS_RD_Q10 = _mm256_permutevar8x32_epi32(SS_RD_Q10, mask);
            SS_xq_Q14 = _mm256_permutevar8x32_epi32(SS_xq_Q14, mask);
            SS_LF_AR_Q14 = _mm256_permutevar8x32_epi32(SS_LF_AR_Q14, mask);
            SS_Diff_Q14 = _mm256_permutevar8x32_epi32(SS_Diff_Q14, mask);
            SS_sLTP_shp_Q14 = _mm256_permutevar8x32_epi32(SS_sLTP_shp_Q14, mask);
            SS_LPC_exc_Q14 = _mm256_permutevar8x32_epi32(SS_LPC_exc_Q14, mask);
        }

        /* Write samples from winner to output and long-term filter states */
        if (subfr > 0 || i >= decisionDelay)
        {
            pulses[i - decisionDelay] =
                (opus_int8)silk_sar_round_32(silk_select_winner(psLastSample->Q_Q10, Winner_selector), 10);
            xq[i - decisionDelay] =
                silk_sat16((opus_int32)silk_sar_round_smulww(silk_select_winner(psLastSample->Xq_Q14, Winner_selector), delayedGain_Q10[last_smple_idx], 8));
            NSQ->sLTP_shp_Q14[NSQ->sLTP_shp_buf_idx - decisionDelay] =
                silk_select_winner(psLastSample->Shape_Q14, Winner_selector);
            sLTP_Q15[NSQ->sLTP_buf_idx - decisionDelay] =
                silk_select_winner(psLastSample->Pred_Q15, Winner_selector);
        }
        NSQ->sLTP_shp_buf_idx++;
        NSQ->sLTP_buf_idx++;

        /* Update states */
        psSample = &psDelDec->Samples[*smpl_buf_idx];
        psDelDec->Seed = _mm_add_epi32(psDelDec->Seed, silk_mm_srai_round_epi32(_mm256_castsi256_si128(SS_Q_Q10), 10));
        psDelDec->LF_AR_Q14 = _mm256_castsi256_si128(SS_LF_AR_Q14);
        psDelDec->Diff_Q14 = _mm256_castsi256_si128(SS_Diff_Q14);
        psDelDec->sLPC_Q14[i + NSQ_LPC_BUF_LENGTH] = _mm256_castsi256_si128(SS_xq_Q14);
        psDelDec->RD_Q10 = _mm256_castsi256_si128(SS_RD_Q10);
        psSample->Xq_Q14 = _mm256_castsi256_si128(SS_xq_Q14);
        psSample->Q_Q10 = _mm256_castsi256_si128(SS_Q_Q10);
        psSample->Pred_Q15 = _mm256_castsi256_si128(SS_LPC_exc_Q14);
        psSample->Shape_Q14 = _mm256_castsi256_si128(SS_sLTP_shp_Q14);
        psSample->RandState = psDelDec->Seed;
        delayedGain_Q10[*smpl_buf_idx] = Gain_Q10;
    }
    /* Update LPC states */
    for (i = 0; i < NSQ_LPC_BUF_LENGTH; i++)
    {
        psDelDec->sLPC_Q14[i] = (&psDelDec->sLPC_Q14[length])[i];
    }
}

static OPUS_INLINE void silk_nsq_del_dec_scale_states_avx2(
    const silk_encoder_state *psEncC,          /* I    Encoder State                   */
    silk_nsq_state *NSQ,                       /* I/O  NSQ state                       */
    NSQ_del_dec_struct *psDelDec,              /* I/O  Delayed decision states         */
    const opus_int16 x16[],                    /* I    Input                           */
    opus_int32 x_sc_Q10[MAX_SUB_FRAME_LENGTH], /* O    Input scaled with 1/Gain in Q10 */
    const opus_int16 sLTP[],                   /* I    Re-whitened LTP state in Q0     */
    opus_int32 sLTP_Q15[],                     /* O    LTP state matching scaled input */
    opus_int subfr,                            /* I    Subframe number                 */
    const opus_int LTP_scale_Q14,              /* I    LTP state scaling               */
    const opus_int32 Gains_Q16[MAX_NB_SUBFR],  /* I                                    */
    const opus_int pitchL[MAX_NB_SUBFR],       /* I    Pitch lag                       */
    const opus_int signal_type,                /* I    Signal type                     */
    const opus_int decisionDelay               /* I    Decision delay                  */
)
{
    int i;
    opus_int lag;
    opus_int32 gain_adj_Q16, inv_gain_Q31, inv_gain_Q26;
    NSQ_del_dec_sample_struct *psSample;

    lag = pitchL[subfr];
    inv_gain_Q31 = silk_INVERSE32_varQ(silk_max(Gains_Q16[subfr], 1), 47);
    silk_assert(inv_gain_Q31 != 0);

    /* Scale input */
    inv_gain_Q26 = silk_sar_round_32(inv_gain_Q31, 5);
    for (i = 0; i < psEncC->subfr_length; i+=4)
    {
        __m256i x = _mm256_cvtepi16_epi64(_mm_loadu_si64(&x16[i]));
        x = _mm256_slli_epi64(_mm256_mul_epi32(x, _mm256_set1_epi32(inv_gain_Q26)), 16);
        _mm_storeu_si128((__m128i*)&x_sc_Q10[i], silk_cvtepi64_epi32_high(x));
    }

    /* After rewhitening the LTP state is un-scaled, so scale with inv_gain_Q16 */
    if (NSQ->rewhite_flag)
    {
        if (subfr == 0)
        {
            /* Do LTP downscaling */
            inv_gain_Q31 = silk_LSHIFT(silk_SMULWB(inv_gain_Q31, LTP_scale_Q14), 2);
        }
        for (i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++)
        {
            silk_assert(i < MAX_FRAME_LENGTH);
            sLTP_Q15[i] = silk_SMULWB(inv_gain_Q31, sLTP[i]);
        }
    }

    /* Adjust for changing gain */
    if (Gains_Q16[subfr] != NSQ->prev_gain_Q16)
    {
        gain_adj_Q16 = silk_DIV32_varQ(NSQ->prev_gain_Q16, Gains_Q16[subfr], 16);

        /* Scale long-term shaping state */
        for (i = NSQ->sLTP_shp_buf_idx - psEncC->ltp_mem_length; i < NSQ->sLTP_shp_buf_idx; i+=4)
        {
      opus_int32 *p = &NSQ->sLTP_shp_Q14[i];
            _mm_storeu_si128((__m128i*)p, silk_mm_smulww_epi32(_mm_loadu_si128((__m128i*)p), gain_adj_Q16));
        }

        /* Scale long-term prediction state */
        if (signal_type == TYPE_VOICED && NSQ->rewhite_flag == 0)
        {
            for (i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx - decisionDelay; i++)
            {
                sLTP_Q15[i] = ((opus_int64)sLTP_Q15[i]) * ((opus_int64)gain_adj_Q16) >> 16;
            }
        }

        /* Scale scalar states */
        psDelDec->LF_AR_Q14 = silk_mm_smulww_epi32(psDelDec->LF_AR_Q14, gain_adj_Q16);
        psDelDec->Diff_Q14 = silk_mm_smulww_epi32(psDelDec->Diff_Q14, gain_adj_Q16);

        /* Scale short-term prediction and shaping states */
        for (i = 0; i < NSQ_LPC_BUF_LENGTH; i++)
        {
            psDelDec->sLPC_Q14[i] = silk_mm_smulww_epi32(psDelDec->sLPC_Q14[i], gain_adj_Q16);
        }
        for (i = 0; i < DECISION_DELAY; i++)
        {
            psSample = &psDelDec->Samples[i];
            psSample->Pred_Q15 = silk_mm_smulww_epi32(psSample->Pred_Q15, gain_adj_Q16);
            psSample->Shape_Q14 = silk_mm_smulww_epi32(psSample->Shape_Q14, gain_adj_Q16);
        }
        for (i = 0; i < MAX_SHAPE_LPC_ORDER; i++)
        {
            psDelDec->sAR2_Q14[i] = silk_mm_smulww_epi32(psDelDec->sAR2_Q14[i], gain_adj_Q16);
        }

        /* Save inverse gain */
        NSQ->prev_gain_Q16 = Gains_Q16[subfr];
    }
}

static OPUS_INLINE void silk_LPC_analysis_filter_avx2(
    opus_int16                  *out,               /* O    Output signal                           */
    const opus_int16            *in,                /* I    Input signal                            */
    const opus_int16            *B,                 /* I    MA prediction coefficients, Q12 [order] */
    const opus_int32            len,                /* I    Signal length                           */
    const opus_int32            order               /* I    Filter order                            */
)
{
    int i;
    opus_int32       out32_Q12, out32;
    silk_assert(order == 10 || order == 16);

    for(i = order; i < len; i++ )
    {
        const opus_int16 *in_ptr = &in[ i ];
        /* Allowing wrap around so that two wraps can cancel each other. The rare
           cases where the result wraps around can only be triggered by invalid streams*/

        __m256i in_v = _mm256_cvtepi16_epi32(_mm_loadu_si128((__m128i*)&in_ptr[-8]));
        __m256i B_v  = _mm256_cvtepi16_epi32(_mm_loadu_si128((__m128i*)&      B[0]));
        __m256i sum = _mm256_mullo_epi32(in_v, silk_mm256_reverse_epi32(B_v));
        if (order > 10)
        {
            in_v = _mm256_cvtepi16_epi32(_mm_loadu_si128((__m128i*)&in_ptr[-16]));
            B_v  = _mm256_cvtepi16_epi32(_mm_loadu_si128((__m128i*)&B       [8]));
            B_v  = silk_mm256_reverse_epi32(B_v);
        }
        else
        {
            in_v = _mm256_cvtepi16_epi32(_mm_loadu_si32(&in_ptr[-10]));
            B_v  = _mm256_cvtepi16_epi32(_mm_loadu_si32(&B       [8]));
            B_v  = _mm256_shuffle_epi32(B_v, 0x01);
        }
        sum = _mm256_add_epi32(sum, _mm256_mullo_epi32(in_v, B_v));

        out32_Q12 = silk_mm256_hsum_epi32(sum);

        /* Subtract prediction */
        out32_Q12 = silk_SUB32_ovflw( silk_LSHIFT( (opus_int32)*in_ptr, 12 ), out32_Q12 );

        /* Scale to Q0 */
        out32 = silk_sar_round_32(out32_Q12, 12);

        /* Saturate output */
        out[ i ] = silk_sat16(out32);
    }

    /* Set first d output samples to zero */
    silk_memset( out, 0, order * sizeof( opus_int16 ) );
}

Coverage Report

Created: 2025-08-28 07:12