| /* |
| * 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; |
| } |
| } |