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- /*
- * Copyright (c) 2018 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 <stdio.h>
- #include "./vpx_dsp_rtcd.h"
- #include "vpx/vpx_integer.h"
- #include "vpx_dsp/x86/mem_sse2.h"
- extern const int16_t vpx_rv[];
- void vpx_mbpost_proc_down_sse2(unsigned char *dst, int pitch, int rows,
- int cols, int flimit) {
- int col;
- const __m128i zero = _mm_setzero_si128();
- const __m128i f = _mm_set1_epi32(flimit);
- DECLARE_ALIGNED(16, int16_t, above_context[8 * 8]);
- // 8 columns are processed at a time.
- // If rows is less than 8 the bottom border extension fails.
- assert(cols % 8 == 0);
- assert(rows >= 8);
- for (col = 0; col < cols; col += 8) {
- int row, i;
- __m128i s = _mm_loadl_epi64((__m128i *)dst);
- __m128i sum, sumsq_0, sumsq_1;
- __m128i tmp_0, tmp_1;
- __m128i below_context;
- s = _mm_unpacklo_epi8(s, zero);
- for (i = 0; i < 8; ++i) {
- _mm_store_si128((__m128i *)above_context + i, s);
- }
- // sum *= 9
- sum = _mm_slli_epi16(s, 3);
- sum = _mm_add_epi16(s, sum);
- // sum^2 * 9 == (sum * 9) * sum
- tmp_0 = _mm_mullo_epi16(sum, s);
- tmp_1 = _mm_mulhi_epi16(sum, s);
- sumsq_0 = _mm_unpacklo_epi16(tmp_0, tmp_1);
- sumsq_1 = _mm_unpackhi_epi16(tmp_0, tmp_1);
- // Prime sum/sumsq
- for (i = 1; i <= 6; ++i) {
- __m128i a = _mm_loadl_epi64((__m128i *)(dst + i * pitch));
- a = _mm_unpacklo_epi8(a, zero);
- sum = _mm_add_epi16(sum, a);
- a = _mm_mullo_epi16(a, a);
- sumsq_0 = _mm_add_epi32(sumsq_0, _mm_unpacklo_epi16(a, zero));
- sumsq_1 = _mm_add_epi32(sumsq_1, _mm_unpackhi_epi16(a, zero));
- }
- for (row = 0; row < rows + 8; row++) {
- const __m128i above =
- _mm_load_si128((__m128i *)above_context + (row & 7));
- __m128i this_row = _mm_loadl_epi64((__m128i *)(dst + row * pitch));
- __m128i above_sq, below_sq;
- __m128i mask_0, mask_1;
- __m128i multmp_0, multmp_1;
- __m128i rv;
- __m128i out;
- this_row = _mm_unpacklo_epi8(this_row, zero);
- if (row + 7 < rows) {
- // Instead of copying the end context we just stop loading when we get
- // to the last one.
- below_context = _mm_loadl_epi64((__m128i *)(dst + (row + 7) * pitch));
- below_context = _mm_unpacklo_epi8(below_context, zero);
- }
- sum = _mm_sub_epi16(sum, above);
- sum = _mm_add_epi16(sum, below_context);
- // context^2 fits in 16 bits. Don't need to mulhi and combine. Just zero
- // extend. Unfortunately we can't do below_sq - above_sq in 16 bits
- // because x86 does not have unpack with sign extension.
- above_sq = _mm_mullo_epi16(above, above);
- sumsq_0 = _mm_sub_epi32(sumsq_0, _mm_unpacklo_epi16(above_sq, zero));
- sumsq_1 = _mm_sub_epi32(sumsq_1, _mm_unpackhi_epi16(above_sq, zero));
- below_sq = _mm_mullo_epi16(below_context, below_context);
- sumsq_0 = _mm_add_epi32(sumsq_0, _mm_unpacklo_epi16(below_sq, zero));
- sumsq_1 = _mm_add_epi32(sumsq_1, _mm_unpackhi_epi16(below_sq, zero));
- // sumsq * 16 - sumsq == sumsq * 15
- mask_0 = _mm_slli_epi32(sumsq_0, 4);
- mask_0 = _mm_sub_epi32(mask_0, sumsq_0);
- mask_1 = _mm_slli_epi32(sumsq_1, 4);
- mask_1 = _mm_sub_epi32(mask_1, sumsq_1);
- multmp_0 = _mm_mullo_epi16(sum, sum);
- multmp_1 = _mm_mulhi_epi16(sum, sum);
- mask_0 = _mm_sub_epi32(mask_0, _mm_unpacklo_epi16(multmp_0, multmp_1));
- mask_1 = _mm_sub_epi32(mask_1, _mm_unpackhi_epi16(multmp_0, multmp_1));
- // mask - f gives a negative value when mask < f
- mask_0 = _mm_sub_epi32(mask_0, f);
- mask_1 = _mm_sub_epi32(mask_1, f);
- // Shift the sign bit down to create a mask
- mask_0 = _mm_srai_epi32(mask_0, 31);
- mask_1 = _mm_srai_epi32(mask_1, 31);
- mask_0 = _mm_packs_epi32(mask_0, mask_1);
- rv = _mm_loadu_si128((__m128i const *)(vpx_rv + (row & 127)));
- mask_1 = _mm_add_epi16(rv, sum);
- mask_1 = _mm_add_epi16(mask_1, this_row);
- mask_1 = _mm_srai_epi16(mask_1, 4);
- mask_1 = _mm_and_si128(mask_0, mask_1);
- mask_0 = _mm_andnot_si128(mask_0, this_row);
- out = _mm_or_si128(mask_1, mask_0);
- _mm_storel_epi64((__m128i *)(dst + row * pitch),
- _mm_packus_epi16(out, zero));
- _mm_store_si128((__m128i *)above_context + ((row + 8) & 7), this_row);
- }
- dst += 8;
- }
- }
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