summaryrefslogtreecommitdiffstats
path: root/third_party/aom/av1/common/x86/av1_convolve_scale_sse4.c
blob: d9fb53785663ce633765439d5c3536fe21f518c5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
/*
 * Copyright (c) 2017, 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 <assert.h>
#include <smmintrin.h>

#include "config/aom_dsp_rtcd.h"

#include "aom_dsp/aom_dsp_common.h"
#include "aom_dsp/aom_filter.h"
#include "av1/common/convolve.h"

// A specialised version of hfilter, the horizontal filter for
// av1_convolve_2d_scale_sse4_1. This version only supports 8 tap filters.
static void hfilter8(const uint8_t *src, int src_stride, int16_t *dst, int w,
                     int h, int subpel_x_qn, int x_step_qn,
                     const InterpFilterParams *filter_params, unsigned round) {
  const int bd = 8;
  const int ntaps = 8;

  src -= ntaps / 2 - 1;

  int32_t round_add32 = (1 << round) / 2 + (1 << (bd + FILTER_BITS - 1));
  const __m128i round_add = _mm_set1_epi32(round_add32);
  const __m128i round_shift = _mm_cvtsi32_si128(round);

  int x_qn = subpel_x_qn;
  for (int x = 0; x < w; ++x, x_qn += x_step_qn) {
    const uint8_t *const src_col = src + (x_qn >> SCALE_SUBPEL_BITS);
    const int filter_idx = (x_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
    assert(filter_idx < SUBPEL_SHIFTS);
    const int16_t *filter =
        av1_get_interp_filter_subpel_kernel(filter_params, filter_idx);

    // Load the filter coefficients
    const __m128i coefflo = _mm_loadu_si128((__m128i *)filter);
    const __m128i zero = _mm_castps_si128(_mm_setzero_ps());

    int y;
    for (y = 0; y <= h - 4; y += 4) {
      const uint8_t *const src0 = src_col + y * src_stride;
      const uint8_t *const src1 = src0 + 1 * src_stride;
      const uint8_t *const src2 = src0 + 2 * src_stride;
      const uint8_t *const src3 = src0 + 3 * src_stride;

      // Load up source data. This is 8-bit input data; each load is just
      // loading the lower half of the register and gets 8 pixels
      const __m128i data08 = _mm_loadl_epi64((__m128i *)src0);
      const __m128i data18 = _mm_loadl_epi64((__m128i *)src1);
      const __m128i data28 = _mm_loadl_epi64((__m128i *)src2);
      const __m128i data38 = _mm_loadl_epi64((__m128i *)src3);

      // Now zero-extend up to 16-bit precision by interleaving with
      // zeros. Drop the upper half of each register (which just had zeros)
      const __m128i data0lo = _mm_unpacklo_epi8(data08, zero);
      const __m128i data1lo = _mm_unpacklo_epi8(data18, zero);
      const __m128i data2lo = _mm_unpacklo_epi8(data28, zero);
      const __m128i data3lo = _mm_unpacklo_epi8(data38, zero);

      // Multiply by coefficients
      const __m128i conv0lo = _mm_madd_epi16(data0lo, coefflo);
      const __m128i conv1lo = _mm_madd_epi16(data1lo, coefflo);
      const __m128i conv2lo = _mm_madd_epi16(data2lo, coefflo);
      const __m128i conv3lo = _mm_madd_epi16(data3lo, coefflo);

      // Reduce horizontally and add
      const __m128i conv01lo = _mm_hadd_epi32(conv0lo, conv1lo);
      const __m128i conv23lo = _mm_hadd_epi32(conv2lo, conv3lo);
      const __m128i conv = _mm_hadd_epi32(conv01lo, conv23lo);

      // Divide down by (1 << round), rounding to nearest.
      __m128i shifted =
          _mm_sra_epi32(_mm_add_epi32(conv, round_add), round_shift);

      shifted = _mm_packus_epi32(shifted, shifted);
      // Write transposed to the output
      _mm_storel_epi64((__m128i *)(dst + y + x * h), shifted);
    }
    for (; y < h; ++y) {
      const uint8_t *const src_row = src_col + y * src_stride;

      int32_t sum = (1 << (bd + FILTER_BITS - 1));
      for (int k = 0; k < ntaps; ++k) {
        sum += filter[k] * src_row[k];
      }

      dst[y + x * h] = ROUND_POWER_OF_TWO(sum, round);
    }
  }
}

static __m128i convolve_16_8(const int16_t *src, __m128i coeff) {
  __m128i data = _mm_loadu_si128((__m128i *)src);
  return _mm_madd_epi16(data, coeff);
}

// A specialised version of vfilter, the vertical filter for
// av1_convolve_2d_scale_sse4_1. This version only supports 8 tap filters.
static void vfilter8(const int16_t *src, int src_stride, uint8_t *dst,
                     int dst_stride, int w, int h, int subpel_y_qn,
                     int y_step_qn, const InterpFilterParams *filter_params,
                     const ConvolveParams *conv_params, int bd) {
  const int offset_bits = bd + 2 * FILTER_BITS - conv_params->round_0;
  const int ntaps = 8;

  const __m128i round_shift = _mm_cvtsi32_si128(conv_params->round_1);

  const int32_t sub32 = ((1 << (offset_bits - conv_params->round_1)) +
                         (1 << (offset_bits - conv_params->round_1 - 1)));
  const __m128i sub = _mm_set1_epi16(sub32);

  CONV_BUF_TYPE *dst16 = conv_params->dst;
  const int dst16_stride = conv_params->dst_stride;
  const int bits =
      FILTER_BITS * 2 - conv_params->round_0 - conv_params->round_1;
  const __m128i bits_shift = _mm_cvtsi32_si128(bits);
  const __m128i bits_const = _mm_set1_epi16(((1 << bits) >> 1));
  const __m128i round_shift_add =
      _mm_set1_epi32(((1 << conv_params->round_1) >> 1));
  const __m128i res_add_const = _mm_set1_epi32(1 << offset_bits);

  const int w0 = conv_params->fwd_offset;
  const int w1 = conv_params->bck_offset;
  const __m128i wt0 = _mm_set1_epi16(w0);
  const __m128i wt1 = _mm_set1_epi16(w1);
  const __m128i wt = _mm_unpacklo_epi16(wt0, wt1);

  int y_qn = subpel_y_qn;
  for (int y = 0; y < h; ++y, y_qn += y_step_qn) {
    const int16_t *src_y = src + (y_qn >> SCALE_SUBPEL_BITS);
    const int filter_idx = (y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
    assert(filter_idx < SUBPEL_SHIFTS);
    const int16_t *filter =
        av1_get_interp_filter_subpel_kernel(filter_params, filter_idx);

    const __m128i coeff0716 = _mm_loadu_si128((__m128i *)filter);
    int x;
    for (x = 0; x <= w - 4; x += 4) {
      const int16_t *const src0 = src_y + x * src_stride;
      const int16_t *const src1 = src0 + 1 * src_stride;
      const int16_t *const src2 = src0 + 2 * src_stride;
      const int16_t *const src3 = src0 + 3 * src_stride;

      // Load the source data for the three rows, adding the three registers of
      // convolved products to one as we go (conv0..conv3) to avoid the
      // register pressure getting too high.
      const __m128i conv0 = convolve_16_8(src0, coeff0716);
      const __m128i conv1 = convolve_16_8(src1, coeff0716);
      const __m128i conv2 = convolve_16_8(src2, coeff0716);
      const __m128i conv3 = convolve_16_8(src3, coeff0716);

      // Now reduce horizontally to get one lane for each result
      const __m128i conv01 = _mm_hadd_epi32(conv0, conv1);
      const __m128i conv23 = _mm_hadd_epi32(conv2, conv3);
      __m128i conv = _mm_hadd_epi32(conv01, conv23);

      conv = _mm_add_epi32(conv, res_add_const);
      // Divide down by (1 << round_1), rounding to nearest and subtract sub32.
      __m128i shifted =
          _mm_sra_epi32(_mm_add_epi32(conv, round_shift_add), round_shift);

      uint8_t *dst_x = dst + y * dst_stride + x;
      CONV_BUF_TYPE *dst_16_x = dst16 + y * dst16_stride + x;
      __m128i result;
      __m128i shifted_16 = _mm_packus_epi32(shifted, shifted);

      if (conv_params->is_compound) {
        if (conv_params->do_average) {
          const __m128i p_16 = _mm_loadl_epi64((__m128i *)dst_16_x);
          if (conv_params->use_jnt_comp_avg) {
            const __m128i p_16_lo = _mm_unpacklo_epi16(p_16, shifted_16);
            const __m128i wt_res_lo = _mm_madd_epi16(p_16_lo, wt);
            const __m128i shifted_32 =
                _mm_srai_epi32(wt_res_lo, DIST_PRECISION_BITS);
            shifted_16 = _mm_packus_epi32(shifted_32, shifted_32);
          } else {
            shifted_16 = _mm_srai_epi16(_mm_add_epi16(p_16, shifted_16), 1);
          }
          const __m128i subbed = _mm_sub_epi16(shifted_16, sub);
          result = _mm_sra_epi16(_mm_add_epi16(subbed, bits_const), bits_shift);
          const __m128i result_8 = _mm_packus_epi16(result, result);
          *(uint32_t *)dst_x = _mm_cvtsi128_si32(result_8);
        } else {
          _mm_storel_epi64((__m128i *)dst_16_x, shifted_16);
        }
      } else {
        const __m128i subbed = _mm_sub_epi16(shifted_16, sub);
        result = _mm_sra_epi16(_mm_add_epi16(subbed, bits_const), bits_shift);
        const __m128i result_8 = _mm_packus_epi16(result, result);
        *(uint32_t *)dst_x = _mm_cvtsi128_si32(result_8);
      }
    }
    for (; x < w; ++x) {
      const int16_t *src_x = src_y + x * src_stride;
      int32_t sum = 1 << offset_bits;
      for (int k = 0; k < ntaps; ++k) sum += filter[k] * src_x[k];
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1);

      if (conv_params->is_compound) {
        if (conv_params->do_average) {
          int32_t tmp = dst16[y * dst16_stride + x];
          if (conv_params->use_jnt_comp_avg) {
            tmp = tmp * conv_params->fwd_offset + res * conv_params->bck_offset;
            tmp = tmp >> DIST_PRECISION_BITS;
          } else {
            tmp += res;
            tmp = tmp >> 1;
          }
          /* Subtract round offset and convolve round */
          tmp = tmp - sub32;
          dst[y * dst_stride + x] = clip_pixel(ROUND_POWER_OF_TWO(tmp, bits));
        } else {
          dst16[y * dst16_stride + x] = res;
        }
      } else {
        /* Subtract round offset and convolve round */
        int32_t tmp = res - ((1 << (offset_bits - conv_params->round_1)) +
                             (1 << (offset_bits - conv_params->round_1 - 1)));
        dst[y * dst_stride + x] = clip_pixel(ROUND_POWER_OF_TWO(tmp, bits));
      }
    }
  }
}
void av1_convolve_2d_scale_sse4_1(const uint8_t *src, int src_stride,
                                  uint8_t *dst8, int dst8_stride, int w, int h,
                                  const InterpFilterParams *filter_params_x,
                                  const InterpFilterParams *filter_params_y,
                                  const int subpel_x_qn, const int x_step_qn,
                                  const int subpel_y_qn, const int y_step_qn,
                                  ConvolveParams *conv_params) {
  // TODO(yaowu): remove unnecessary initializations
  int16_t tmp[(2 * MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE] = { 0 };
  int im_h = (((h - 1) * y_step_qn + subpel_y_qn) >> SCALE_SUBPEL_BITS) +
             filter_params_y->taps;

  const int xtaps = filter_params_x->taps;
  const int ytaps = filter_params_y->taps;
  const int fo_vert = ytaps / 2 - 1;
  assert((xtaps == 8) && (ytaps == 8));
  (void)xtaps;

  // horizontal filter
  hfilter8(src - fo_vert * src_stride, src_stride, tmp, w, im_h, subpel_x_qn,
           x_step_qn, filter_params_x, conv_params->round_0);

  // vertical filter (input is transposed)
  vfilter8(tmp, im_h, dst8, dst8_stride, w, h, subpel_y_qn, y_step_qn,
           filter_params_y, conv_params, 8);
}

// A specialised version of hfilter, the horizontal filter for
// av1_highbd_convolve_2d_scale_sse4_1. This version only supports 8 tap
// filters.
static void highbd_hfilter8(const uint16_t *src, int src_stride, int16_t *dst,
                            int w, int h, int subpel_x_qn, int x_step_qn,
                            const InterpFilterParams *filter_params,
                            unsigned round, int bd) {
  const int ntaps = 8;

  src -= ntaps / 2 - 1;

  int32_t round_add32 = (1 << round) / 2 + (1 << (bd + FILTER_BITS - 1));
  const __m128i round_add = _mm_set1_epi32(round_add32);
  const __m128i round_shift = _mm_cvtsi32_si128(round);

  int x_qn = subpel_x_qn;
  for (int x = 0; x < w; ++x, x_qn += x_step_qn) {
    const uint16_t *const src_col = src + (x_qn >> SCALE_SUBPEL_BITS);
    const int filter_idx = (x_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
    assert(filter_idx < SUBPEL_SHIFTS);
    const int16_t *filter =
        av1_get_interp_filter_subpel_kernel(filter_params, filter_idx);

    // Load the filter coefficients
    const __m128i coefflo = _mm_loadu_si128((__m128i *)filter);

    int y;
    for (y = 0; y <= h - 4; y += 4) {
      const uint16_t *const src0 = src_col + y * src_stride;
      const uint16_t *const src1 = src0 + 1 * src_stride;
      const uint16_t *const src2 = src0 + 2 * src_stride;
      const uint16_t *const src3 = src0 + 3 * src_stride;

      // Load up source data. This is 16-bit input data, so each load gets the 8
      // pixels we need.
      const __m128i data0lo = _mm_loadu_si128((__m128i *)src0);
      const __m128i data1lo = _mm_loadu_si128((__m128i *)src1);
      const __m128i data2lo = _mm_loadu_si128((__m128i *)src2);
      const __m128i data3lo = _mm_loadu_si128((__m128i *)src3);

      // Multiply by coefficients
      const __m128i conv0lo = _mm_madd_epi16(data0lo, coefflo);
      const __m128i conv1lo = _mm_madd_epi16(data1lo, coefflo);
      const __m128i conv2lo = _mm_madd_epi16(data2lo, coefflo);
      const __m128i conv3lo = _mm_madd_epi16(data3lo, coefflo);

      // Reduce horizontally and add
      const __m128i conv01lo = _mm_hadd_epi32(conv0lo, conv1lo);
      const __m128i conv23lo = _mm_hadd_epi32(conv2lo, conv3lo);
      const __m128i conv = _mm_hadd_epi32(conv01lo, conv23lo);

      // Divide down by (1 << round), rounding to nearest.
      __m128i shifted =
          _mm_sra_epi32(_mm_add_epi32(conv, round_add), round_shift);

      shifted = _mm_packus_epi32(shifted, shifted);
      // Write transposed to the output
      _mm_storel_epi64((__m128i *)(dst + y + x * h), shifted);
    }
    for (; y < h; ++y) {
      const uint16_t *const src_row = src_col + y * src_stride;

      int32_t sum = (1 << (bd + FILTER_BITS - 1));
      for (int k = 0; k < ntaps; ++k) {
        sum += filter[k] * src_row[k];
      }

      dst[y + x * h] = ROUND_POWER_OF_TWO(sum, round);
    }
  }
}
// A specialised version of vfilter, the vertical filter for
// av1_highbd_convolve_2d_scale_sse4_1. This version only supports 8 tap
// filters.
static void highbd_vfilter8(const int16_t *src, int src_stride, uint16_t *dst,
                            int dst_stride, int w, int h, int subpel_y_qn,
                            int y_step_qn,
                            const InterpFilterParams *filter_params,
                            const ConvolveParams *conv_params, int bd) {
  const int offset_bits = bd + 2 * FILTER_BITS - conv_params->round_0;
  const int ntaps = 8;

  const __m128i round_shift = _mm_cvtsi32_si128(conv_params->round_1);

  const int32_t sub32 = ((1 << (offset_bits - conv_params->round_1)) +
                         (1 << (offset_bits - conv_params->round_1 - 1)));
  const __m128i sub = _mm_set1_epi32(sub32);

  CONV_BUF_TYPE *dst16 = conv_params->dst;
  const int dst16_stride = conv_params->dst_stride;
  const __m128i clip_pixel_ =
      _mm_set1_epi16(bd == 10 ? 1023 : (bd == 12 ? 4095 : 255));
  const int bits =
      FILTER_BITS * 2 - conv_params->round_0 - conv_params->round_1;
  const __m128i bits_shift = _mm_cvtsi32_si128(bits);
  const __m128i bits_const = _mm_set1_epi32(((1 << bits) >> 1));
  const __m128i round_shift_add =
      _mm_set1_epi32(((1 << conv_params->round_1) >> 1));
  const __m128i res_add_const = _mm_set1_epi32(1 << offset_bits);
  const int round_bits =
      2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
  __m128i round_bits_shift = _mm_cvtsi32_si128(round_bits);
  __m128i round_bits_const = _mm_set1_epi32(((1 << round_bits) >> 1));

  const int w0 = conv_params->fwd_offset;
  const int w1 = conv_params->bck_offset;
  const __m128i wt0 = _mm_set1_epi32(w0);
  const __m128i wt1 = _mm_set1_epi32(w1);

  int y_qn = subpel_y_qn;
  for (int y = 0; y < h; ++y, y_qn += y_step_qn) {
    const int16_t *src_y = src + (y_qn >> SCALE_SUBPEL_BITS);
    const int filter_idx = (y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
    assert(filter_idx < SUBPEL_SHIFTS);
    const int16_t *filter =
        av1_get_interp_filter_subpel_kernel(filter_params, filter_idx);

    const __m128i coeff0716 = _mm_loadu_si128((__m128i *)filter);
    int x;
    for (x = 0; x <= w - 4; x += 4) {
      const int16_t *const src0 = src_y + x * src_stride;
      const int16_t *const src1 = src0 + 1 * src_stride;
      const int16_t *const src2 = src0 + 2 * src_stride;
      const int16_t *const src3 = src0 + 3 * src_stride;

      // Load the source data for the three rows, adding the three registers of
      // convolved products to one as we go (conv0..conv3) to avoid the
      // register pressure getting too high.
      const __m128i conv0 = convolve_16_8(src0, coeff0716);
      const __m128i conv1 = convolve_16_8(src1, coeff0716);
      const __m128i conv2 = convolve_16_8(src2, coeff0716);
      const __m128i conv3 = convolve_16_8(src3, coeff0716);

      // Now reduce horizontally to get one lane for each result
      const __m128i conv01 = _mm_hadd_epi32(conv0, conv1);
      const __m128i conv23 = _mm_hadd_epi32(conv2, conv3);
      __m128i conv = _mm_hadd_epi32(conv01, conv23);
      conv = _mm_add_epi32(conv, res_add_const);

      // Divide down by (1 << round_1), rounding to nearest and subtract sub32.
      __m128i shifted =
          _mm_sra_epi32(_mm_add_epi32(conv, round_shift_add), round_shift);

      uint16_t *dst_x = dst + y * dst_stride + x;
      CONV_BUF_TYPE *dst_16_x = dst16 + y * dst16_stride + x;

      __m128i result;
      if (conv_params->is_compound) {
        if (conv_params->do_average) {
          __m128i p_32 =
              _mm_cvtepu16_epi32(_mm_loadl_epi64((__m128i *)dst_16_x));

          if (conv_params->use_jnt_comp_avg) {
            shifted = _mm_add_epi32(_mm_mullo_epi32(p_32, wt0),
                                    _mm_mullo_epi32(shifted, wt1));
            shifted = _mm_srai_epi32(shifted, DIST_PRECISION_BITS);
          } else {
            shifted = _mm_srai_epi32(_mm_add_epi32(p_32, shifted), 1);
          }
          __m128i res32 = _mm_sub_epi32(shifted, sub);
          res32 = _mm_sra_epi32(_mm_add_epi32(res32, round_bits_const),
                                round_bits_shift);

          __m128i res16 = _mm_packus_epi32(res32, res32);
          res16 = _mm_min_epi16(res16, clip_pixel_);
          _mm_storel_epi64((__m128i *)dst_x, res16);
        } else {
          __m128i shifted_16 = _mm_packus_epi32(shifted, shifted);
          _mm_storel_epi64((__m128i *)dst_16_x, shifted_16);
        }
      } else {
        const __m128i subbed = _mm_sub_epi32(shifted, sub);
        result = _mm_sra_epi16(_mm_add_epi32(subbed, bits_const), bits_shift);
        result = _mm_packus_epi32(result, result);
        result = _mm_min_epi16(result, clip_pixel_);
        _mm_storel_epi64((__m128i *)dst_x, result);
      }
    }

    for (; x < w; ++x) {
      const int16_t *src_x = src_y + x * src_stride;
      int32_t sum = 1 << offset_bits;
      for (int k = 0; k < ntaps; ++k) sum += filter[k] * src_x[k];
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1);
      if (conv_params->is_compound) {
        if (conv_params->do_average) {
          int32_t tmp = dst16[y * dst16_stride + x];
          if (conv_params->use_jnt_comp_avg) {
            tmp = tmp * conv_params->fwd_offset + res * conv_params->bck_offset;
            tmp = tmp >> DIST_PRECISION_BITS;
          } else {
            tmp += res;
            tmp = tmp >> 1;
          }
          /* Subtract round offset and convolve round */
          tmp = tmp - ((1 << (offset_bits - conv_params->round_1)) +
                       (1 << (offset_bits - conv_params->round_1 - 1)));
          dst[y * dst_stride + x] =
              clip_pixel_highbd(ROUND_POWER_OF_TWO(tmp, bits), bd);
        } else {
          dst16[y * dst16_stride + x] = res;
        }
      } else {
        /* Subtract round offset and convolve round */
        int32_t tmp = res - ((1 << (offset_bits - conv_params->round_1)) +
                             (1 << (offset_bits - conv_params->round_1 - 1)));
        dst[y * dst_stride + x] =
            clip_pixel_highbd(ROUND_POWER_OF_TWO(tmp, bits), bd);
      }
    }
  }
}

void av1_highbd_convolve_2d_scale_sse4_1(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride, int w,
    int h, const InterpFilterParams *filter_params_x,
    const InterpFilterParams *filter_params_y, const int subpel_x_qn,
    const int x_step_qn, const int subpel_y_qn, const int y_step_qn,
    ConvolveParams *conv_params, int bd) {
  // TODO(yaowu): Move this out of stack
  DECLARE_ALIGNED(16, int16_t,
                  tmp[(2 * MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE]);
  int im_h = (((h - 1) * y_step_qn + subpel_y_qn) >> SCALE_SUBPEL_BITS) +
             filter_params_y->taps;
  const int xtaps = filter_params_x->taps;
  const int ytaps = filter_params_y->taps;
  const int fo_vert = ytaps / 2 - 1;

  memset(tmp, 0, sizeof(tmp));
  assert((xtaps == 8) && (ytaps == 8));
  (void)xtaps;

  // horizontal filter
  highbd_hfilter8(src - fo_vert * src_stride, src_stride, tmp, w, im_h,
                  subpel_x_qn, x_step_qn, filter_params_x, conv_params->round_0,
                  bd);

  // vertical filter (input is transposed)
  highbd_vfilter8(tmp, im_h, dst, dst_stride, w, h, subpel_y_qn, y_step_qn,
                  filter_params_y, conv_params, bd);
}