src/third_party/libvpx/vp9/encoder/x86/vp9_quantize_sse2.c

/*
 *  Copyright (c) 2014 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 "./vp9_rtcd.h"
#include "vpx/vpx_integer.h"
#include "vpx_dsp/vpx_dsp_common.h"
#include "vpx_dsp/x86/bitdepth_conversion_sse2.h"

void vp9_quantize_fp_sse2(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
                          int skip_block, const int16_t *round_ptr,
                          const int16_t *quant_ptr, tran_low_t *qcoeff_ptr,
                          tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr,
                          uint16_t *eob_ptr, const int16_t *scan,
                          const int16_t *iscan) {
  __m128i zero;
  __m128i thr;
  int nzflag;
  __m128i eob;
  __m128i round, quant, dequant;

  (void)scan;
  (void)skip_block;
  assert(!skip_block);

  coeff_ptr += n_coeffs;
  iscan += n_coeffs;
  qcoeff_ptr += n_coeffs;
  dqcoeff_ptr += n_coeffs;
  n_coeffs = -n_coeffs;
  zero = _mm_setzero_si128();

  {
    __m128i coeff0, coeff1;

    // Setup global values
    {
      round = _mm_load_si128((const __m128i *)round_ptr);
      quant = _mm_load_si128((const __m128i *)quant_ptr);
      dequant = _mm_load_si128((const __m128i *)dequant_ptr);
    }

    {
      __m128i coeff0_sign, coeff1_sign;
      __m128i qcoeff0, qcoeff1;
      __m128i qtmp0, qtmp1;
      // Do DC and first 15 AC
      coeff0 = load_tran_low(coeff_ptr + n_coeffs);
      coeff1 = load_tran_low(coeff_ptr + n_coeffs + 8);

      // Poor man's sign extract
      coeff0_sign = _mm_srai_epi16(coeff0, 15);
      coeff1_sign = _mm_srai_epi16(coeff1, 15);
      qcoeff0 = _mm_xor_si128(coeff0, coeff0_sign);
      qcoeff1 = _mm_xor_si128(coeff1, coeff1_sign);
      qcoeff0 = _mm_sub_epi16(qcoeff0, coeff0_sign);
      qcoeff1 = _mm_sub_epi16(qcoeff1, coeff1_sign);

      qcoeff0 = _mm_adds_epi16(qcoeff0, round);
      round = _mm_unpackhi_epi64(round, round);
      qcoeff1 = _mm_adds_epi16(qcoeff1, round);
      qtmp0 = _mm_mulhi_epi16(qcoeff0, quant);
      quant = _mm_unpackhi_epi64(quant, quant);
      qtmp1 = _mm_mulhi_epi16(qcoeff1, quant);

      // 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);

      store_tran_low(qcoeff0, qcoeff_ptr + n_coeffs);
      store_tran_low(qcoeff1, qcoeff_ptr + n_coeffs + 8);

      coeff0 = _mm_mullo_epi16(qcoeff0, dequant);
      dequant = _mm_unpackhi_epi64(dequant, dequant);
      coeff1 = _mm_mullo_epi16(qcoeff1, dequant);

      store_tran_low(coeff0, dqcoeff_ptr + n_coeffs);
      store_tran_low(coeff1, dqcoeff_ptr + n_coeffs + 8);
    }

    {
      // Scan for eob
      __m128i zero_coeff0, zero_coeff1;
      __m128i nzero_coeff0, nzero_coeff1;
      __m128i iscan0, iscan1;
      __m128i eob1;
      zero_coeff0 = _mm_cmpeq_epi16(coeff0, zero);
      zero_coeff1 = _mm_cmpeq_epi16(coeff1, zero);
      nzero_coeff0 = _mm_cmpeq_epi16(zero_coeff0, zero);
      nzero_coeff1 = _mm_cmpeq_epi16(zero_coeff1, zero);
      iscan0 = _mm_load_si128((const __m128i *)(iscan + n_coeffs));
      iscan1 = _mm_load_si128((const __m128i *)(iscan + n_coeffs) + 1);
      // Add one to convert from indices to counts
      iscan0 = _mm_sub_epi16(iscan0, nzero_coeff0);
      iscan1 = _mm_sub_epi16(iscan1, nzero_coeff1);
      eob = _mm_and_si128(iscan0, nzero_coeff0);
      eob1 = _mm_and_si128(iscan1, nzero_coeff1);
      eob = _mm_max_epi16(eob, eob1);
    }
    n_coeffs += 8 * 2;
  }

  thr = _mm_srai_epi16(dequant, 1);

  // AC only loop
  while (n_coeffs < 0) {
    __m128i coeff0, coeff1;
    {
      __m128i coeff0_sign, coeff1_sign;
      __m128i qcoeff0, qcoeff1;
      __m128i qtmp0, qtmp1;

      coeff0 = load_tran_low(coeff_ptr + n_coeffs);
      coeff1 = load_tran_low(coeff_ptr + n_coeffs + 8);

      // Poor man's sign extract
      coeff0_sign = _mm_srai_epi16(coeff0, 15);
      coeff1_sign = _mm_srai_epi16(coeff1, 15);
      qcoeff0 = _mm_xor_si128(coeff0, coeff0_sign);
      qcoeff1 = _mm_xor_si128(coeff1, coeff1_sign);
      qcoeff0 = _mm_sub_epi16(qcoeff0, coeff0_sign);
      qcoeff1 = _mm_sub_epi16(qcoeff1, coeff1_sign);

      nzflag = _mm_movemask_epi8(_mm_cmpgt_epi16(qcoeff0, thr)) |
               _mm_movemask_epi8(_mm_cmpgt_epi16(qcoeff1, thr));

      if (nzflag) {
        qcoeff0 = _mm_adds_epi16(qcoeff0, round);
        qcoeff1 = _mm_adds_epi16(qcoeff1, round);
        qtmp0 = _mm_mulhi_epi16(qcoeff0, quant);
        qtmp1 = _mm_mulhi_epi16(qcoeff1, quant);

        // 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);

        store_tran_low(qcoeff0, qcoeff_ptr + n_coeffs);
        store_tran_low(qcoeff1, qcoeff_ptr + n_coeffs + 8);

        coeff0 = _mm_mullo_epi16(qcoeff0, dequant);
        coeff1 = _mm_mullo_epi16(qcoeff1, dequant);

        store_tran_low(coeff0, dqcoeff_ptr + n_coeffs);
        store_tran_low(coeff1, dqcoeff_ptr + n_coeffs + 8);
      } else {
        store_zero_tran_low(qcoeff_ptr + n_coeffs);
        store_zero_tran_low(qcoeff_ptr + n_coeffs + 8);

        store_zero_tran_low(dqcoeff_ptr + n_coeffs);
        store_zero_tran_low(dqcoeff_ptr + n_coeffs + 8);
      }
    }

    if (nzflag) {
      // Scan for eob
      __m128i zero_coeff0, zero_coeff1;
      __m128i nzero_coeff0, nzero_coeff1;
      __m128i iscan0, iscan1;
      __m128i eob0, eob1;
      zero_coeff0 = _mm_cmpeq_epi16(coeff0, zero);
      zero_coeff1 = _mm_cmpeq_epi16(coeff1, zero);
      nzero_coeff0 = _mm_cmpeq_epi16(zero_coeff0, zero);
      nzero_coeff1 = _mm_cmpeq_epi16(zero_coeff1, zero);
      iscan0 = _mm_load_si128((const __m128i *)(iscan + n_coeffs));
      iscan1 = _mm_load_si128((const __m128i *)(iscan + n_coeffs) + 1);
      // Add one to convert from indices to counts
      iscan0 = _mm_sub_epi16(iscan0, nzero_coeff0);
      iscan1 = _mm_sub_epi16(iscan1, nzero_coeff1);
      eob0 = _mm_and_si128(iscan0, nzero_coeff0);
      eob1 = _mm_and_si128(iscan1, nzero_coeff1);
      eob0 = _mm_max_epi16(eob0, eob1);
      eob = _mm_max_epi16(eob, eob0);
    }
    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);
  }
}