text: /*
   * Copyright (c) 2016, Alliance for Open Media. All rights reserved
   *
   * This source code is subject to the terms of the BSD 2 Clause License and
   * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
   * was not distributed with this source code in the LICENSE file, you can
   * obtain it at www.aomedia.org/license/software. If the Alliance for Open
   * Media Patent License 1.0 was not distributed with this source code in the
   * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
   */
  
  #include <emmintrin.h>
  #include <xmmintrin.h>
  
  #include "config/av1_rtcd.h"
  
  #include "aom/aom_integer.h"
  
  static INLINE void read_coeff(const tran_low_t *coeff, intptr_t offset,
                                __m128i *c0, __m128i *c1) {
    const tran_low_t *addr = coeff + offset;
    if (sizeof(tran_low_t) == 4) {
      const __m128i x0 = _mm_load_si128((const __m128i *)addr);
      const __m128i x1 = _mm_load_si128((const __m128i *)addr + 1);
      const __m128i x2 = _mm_load_si128((const __m128i *)addr + 2);
      const __m128i x3 = _mm_load_si128((const __m128i *)addr + 3);
      *c0 = _mm_packs_epi32(x0, x1);
      *c1 = _mm_packs_epi32(x2, x3);
    } else {
      *c0 = _mm_load_si128((const __m128i *)addr);
      *c1 = _mm_load_si128((const __m128i *)addr + 1);
    }
  }
  
  static INLINE void write_qcoeff(const __m128i *qc0, const __m128i *qc1,
                                  tran_low_t *qcoeff, intptr_t offset) {
    tran_low_t *addr = qcoeff + offset;
    if (sizeof(tran_low_t) == 4) {
      const __m128i zero = _mm_setzero_si128();
      __m128i sign_bits = _mm_cmplt_epi16(*qc0, zero);
      __m128i y0 = _mm_unpacklo_epi16(*qc0, sign_bits);
      __m128i y1 = _mm_unpackhi_epi16(*qc0, sign_bits);
      _mm_store_si128((__m128i *)addr, y0);
      _mm_store_si128((__m128i *)addr + 1, y1);
  
      sign_bits = _mm_cmplt_epi16(*qc1, zero);
      y0 = _mm_unpacklo_epi16(*qc1, sign_bits);
      y1 = _mm_unpackhi_epi16(*qc1, sign_bits);
      _mm_store_si128((__m128i *)addr + 2, y0);
      _mm_store_si128((__m128i *)addr + 3, y1);
    } else {
      _mm_store_si128((__m128i *)addr, *qc0);
      _mm_store_si128((__m128i *)addr + 1, *qc1);
    }
  }
  
  static INLINE void write_zero(tran_low_t *qcoeff, intptr_t offset) {
    const __m128i zero = _mm_setzero_si128();
    tran_low_t *addr = qcoeff + offset;
    if (sizeof(tran_low_t) == 4) {
      _mm_store_si128((__m128i *)addr, zero);
      _mm_store_si128((__m128i *)addr + 1, zero);
      _mm_store_si128((__m128i *)addr + 2, zero);
      _mm_store_si128((__m128i *)addr + 3, zero);
    } else {
      _mm_store_si128((__m128i *)addr, zero);
      _mm_store_si128((__m128i *)addr + 1, zero);
    }
  }
  
  static INLINE void quantize(const int16_t *iscan_ptr,
                              const tran_low_t *coeff_ptr, intptr_t n_coeffs,
                              tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr,
                              const __m128i *round0, const __m128i *round1,
                              const __m128i *quant0, const __m128i *quant1,
                              const __m128i *dequant0, const __m128i *dequant1,
                              const __m128i *thr0, const __m128i *thr1,
                              __m128i *eob) {
    __m128i coeff0, coeff1;
    // Do DC and first 15 AC
    read_coeff(coeff_ptr, n_coeffs, &coeff0, &coeff1);
  
    // Poor man's sign extract
    const __m128i coeff0_sign = _mm_srai_epi16(coeff0, 15);
    const __m128i coeff1_sign = _mm_srai_epi16(coeff1, 15);
    __m128i qcoeff0 = _mm_xor_si128(coeff0, coeff0_sign);
    __m128i qcoeff1 = _mm_xor_si128(coeff1, coeff1_sign);
    qcoeff0 = _mm_sub_epi16(qcoeff0, coeff0_sign);
    qcoeff1 = _mm_sub_epi16(qcoeff1, coeff1_sign);
    const __m128i mask0 = _mm_or_si128(_mm_cmpgt_epi16(qcoeff0, *thr0),
                                       _mm_cmpeq_epi16(qcoeff0, *thr0));
    const __m128i mask1 = _mm_or_si128(_mm_cmpgt_epi16(qcoeff1, *thr1),
                                       _mm_cmpeq_epi16(qcoeff1, *thr1));
    const int16_t nzflag = _mm_movemask_epi8(mask0) | _mm_movemask_epi8(mask1);
  
    if (nzflag) {
      qcoeff0 = _mm_adds_epi16(qcoeff0, *round0);
      qcoeff1 = _mm_adds_epi16(qcoeff1, *round1);
      const __m128i qtmp0 = _mm_mulhi_epi16(qcoeff0, *quant0);
      const __m128i qtmp1 = _mm_mulhi_epi16(qcoeff1, *quant1);
  
      // Reinsert signs
      qcoeff0 = _mm_xor_si128(qtmp0, coeff0_sign);
      qcoeff1 = _mm_xor_si128(qtmp1, coeff1_sign);
      qcoeff0 = _mm_sub_epi16(qcoeff0, coeff0_sign);
      qcoeff1 = _mm_sub_epi16(qcoeff1, coeff1_sign);
  
      write_qcoeff(&qcoeff0, &qcoeff1, qcoeff_ptr, n_coeffs);
  
      coeff0 = _mm_mullo_epi16(qcoeff0, *dequant0);
      coeff1 = _mm_mullo_epi16(qcoeff1, *dequant1);
  
      write_qcoeff(&coeff0, &coeff1, dqcoeff_ptr, n_coeffs);
  
      const __m128i zero = _mm_setzero_si128();
      // Scan for eob
      const __m128i zero_coeff0 = _mm_cmpeq_epi16(coeff0, zero);
      const __m128i zero_coeff1 = _mm_cmpeq_epi16(coeff1, zero);
      const __m128i nzero_coeff0 = _mm_cmpeq_epi16(zero_coeff0, zero);
      const __m128i nzero_coeff1 = _mm_cmpeq_epi16(zero_coeff1, zero);
      const __m128i iscan0 =
          _mm_load_si128((const __m128i *)(iscan_ptr + n_coeffs));
      const __m128i iscan1 =
          _mm_load_si128((const __m128i *)(iscan_ptr + n_coeffs) + 1);
      // Add one to convert from indices to counts
      const __m128i iscan0_nz = _mm_sub_epi16(iscan0, nzero_coeff0);
      const __m128i iscan1_nz = _mm_sub_epi16(iscan1, nzero_coeff1);
      const __m128i eob0 = _mm_and_si128(iscan0_nz, nzero_coeff0);
      const __m128i eob1 = _mm_and_si128(iscan1_nz, nzero_coeff1);
      const __m128i eob2 = _mm_max_epi16(eob0, eob1);
      *eob = _mm_max_epi16(*eob, eob2);
    } else {
      write_zero(qcoeff_ptr, n_coeffs);
      write_zero(dqcoeff_ptr, n_coeffs);
    }
  }
  
  #if CONFIG_EXTQUANT
  void av1_quantize_fp_sse2(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
                            const int32_t *zbin_ptr, const int32_t *round_ptr,
                            const int32_t *quant_ptr,
                            const int32_t *quant_shift_ptr,
                            tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr,
                            const int32_t *dequant_ptr, uint16_t *eob_ptr,
                            const int16_t *scan_ptr, const int16_t *iscan_ptr) {
  #else
  void av1_quantize_fp_sse2(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
                            const int16_t *zbin_ptr, const int16_t *round_ptr,
                            const int16_t *quant_ptr,
                            const int16_t *quant_shift_ptr,
                            tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr,
                            const int16_t *dequant_ptr, uint16_t *eob_ptr,
                            const int16_t *scan_ptr, const int16_t *iscan_ptr) {
  #endif
    (void)scan_ptr;
    (void)zbin_ptr;
    (void)quant_shift_ptr;
  
    coeff_ptr += n_coeffs;
    iscan_ptr += n_coeffs;
    qcoeff_ptr += n_coeffs;
    dqcoeff_ptr += n_coeffs;
    n_coeffs = -n_coeffs;
  
    const __m128i round0 = _mm_load_si128((const __m128i *)round_ptr);
    const __m128i round1 = _mm_unpackhi_epi64(round0, round0);
    const __m128i quant0 = _mm_load_si128((const __m128i *)quant_ptr);
    const __m128i quant1 = _mm_unpackhi_epi64(quant0, quant0);
    const __m128i dequant0 = _mm_load_si128((const __m128i *)dequant_ptr);
    const __m128i dequant1 = _mm_unpackhi_epi64(dequant0, dequant0);
    const __m128i thr0 = _mm_srai_epi16(dequant0, 1);
    const __m128i thr1 = _mm_srai_epi16(dequant1, 1);
    __m128i eob = _mm_setzero_si128();
  
    quantize(iscan_ptr, coeff_ptr, n_coeffs, qcoeff_ptr, dqcoeff_ptr, &round0,
             &round1, &quant0, &quant1, &dequant0, &dequant1, &thr0, &thr1, &eob);
  
    n_coeffs += 8 * 2;
  
    // AC only loop
    while (n_coeffs < 0) {
      quantize(iscan_ptr, coeff_ptr, n_coeffs, qcoeff_ptr, dqcoeff_ptr, &round1,
               &round1, &quant1, &quant1, &dequant1, &dequant1, &thr1, &thr1,
               &eob);
      n_coeffs += 8 * 2;
    }
  
    // Accumulate EOB
    {
      __m128i eob_shuffled;
      eob_shuffled = _mm_shuffle_epi32(eob, 0xe);
      eob = _mm_max_epi16(eob, eob_shuffled);
      eob_shuffled = _mm_shufflelo_epi16(eob, 0xe);
      eob = _mm_max_epi16(eob, eob_shuffled);
      eob_shuffled = _mm_shufflelo_epi16(eob, 0x1);
      eob = _mm_max_epi16(eob, eob_shuffled);
      *eob_ptr = _mm_extract_epi16(eob, 1);
    }
  }
  