/*

 *  Copyright (c) 2015 The WebM project authors. All Rights Reserved.

 *

 *  Use of this source code is governed by a BSD-style license

 *  that can be found in the LICENSE file in the root of the source

 *  tree. An additional intellectual property rights grant can be found

 *  in the file PATENTS.  All contributing project authors may

 *  be found in the AUTHORS file in the root of the source tree.

 */

#include <assert.h>

#include <emmintrin.h>

#include <xmmintrin.h>

#include "./vpx_dsp_rtcd.h"

#include "vpx/vpx_integer.h"

#include "vpx_dsp/x86/bitdepth_conversion_sse2.h"

#include "vpx_dsp/x86/quantize_sse2.h"

#include "vp9/common/vp9_scan.h"

void vpx_quantize_b_sse2(const tran_low_t *coeff_ptr, intptr_t n_coeffs,

                         const struct macroblock_plane *const mb_plane,

                         tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr,

                         const int16_t *dequant_ptr, uint16_t *eob_ptr,

                         const struct ScanOrder *const scan_order) {

  const __m128i zero = _mm_setzero_si128();

  int index = 16;

  const int16_t *iscan = scan_order->iscan;

  __m128i zbin, round, quant, dequant, shift;

  __m128i coeff0, coeff1, coeff0_sign, coeff1_sign;

  __m128i qcoeff0, qcoeff1;

  __m128i cmp_mask0, cmp_mask1;

  __m128i eob, eob0;

  // Setup global values.

  load_b_values(mb_plane, &zbin, &round, &quant, dequant_ptr, &dequant, &shift);

  // Do DC and first 15 AC.

  coeff0 = load_tran_low(coeff_ptr);

  coeff1 = load_tran_low(coeff_ptr + 8);

  // Poor man's abs().

  coeff0_sign = _mm_srai_epi16(coeff0, 15);

  coeff1_sign = _mm_srai_epi16(coeff1, 15);

  qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);

  qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

  cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

  zbin = _mm_unpackhi_epi64(zbin, zbin);  // Switch DC to AC

  cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

  calculate_qcoeff(&qcoeff0, round, quant, shift);

  round = _mm_unpackhi_epi64(round, round);

  quant = _mm_unpackhi_epi64(quant, quant);

  shift = _mm_unpackhi_epi64(shift, shift);

  calculate_qcoeff(&qcoeff1, round, quant, shift);

  // Reinsert signs

  qcoeff0 = invert_sign_sse2(qcoeff0, coeff0_sign);

  qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

  // Mask out zbin threshold coeffs

  qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

  qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

  store_tran_low(qcoeff0, qcoeff_ptr);

  store_tran_low(qcoeff1, qcoeff_ptr + 8);

  calculate_dqcoeff_and_store(qcoeff0, dequant, dqcoeff_ptr);

  dequant = _mm_unpackhi_epi64(dequant, dequant);

  calculate_dqcoeff_and_store(qcoeff1, dequant, dqcoeff_ptr + 8);

  eob = scan_for_eob(&qcoeff0, &qcoeff1, iscan, 0, zero);

  // AC only loop.

  while (index < n_coeffs) {

    coeff0 = load_tran_low(coeff_ptr + index);

    coeff1 = load_tran_low(coeff_ptr + index + 8);

    coeff0_sign = _mm_srai_epi16(coeff0, 15);

    coeff1_sign = _mm_srai_epi16(coeff1, 15);

    qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

    cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

    cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

    calculate_qcoeff(&qcoeff0, round, quant, shift);

    calculate_qcoeff(&qcoeff1, round, quant, shift);

    qcoeff0 = invert_sign_sse2(qcoeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_tran_low(qcoeff0, qcoeff_ptr + index);

    store_tran_low(qcoeff1, qcoeff_ptr + index + 8);

    calculate_dqcoeff_and_store(qcoeff0, dequant, dqcoeff_ptr + index);

    calculate_dqcoeff_and_store(qcoeff1, dequant, dqcoeff_ptr + index + 8);

    eob0 = scan_for_eob(&qcoeff0, &qcoeff1, iscan, index, zero);

    eob = _mm_max_epi16(eob, eob0);

    index += 16;

  }

  *eob_ptr = accumulate_eob(eob);

}