mirror of
https://github.com/webmproject/libwebp.git
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202 lines
8.5 KiB
C
202 lines
8.5 KiB
C
// Copyright 2022 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Speed-critical functions for Sharp YUV.
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include "sharpyuv/sharpyuv_dsp.h"
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#if defined(WEBP_USE_SSE2)
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#include <stdlib.h>
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#include <emmintrin.h>
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static uint16_t clip_SSE2(int v, int max) {
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return (v < 0) ? 0 : (v > max) ? max : (uint16_t)v;
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}
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static uint64_t SharpYuvUpdateY_SSE2(const uint16_t* ref, const uint16_t* src,
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uint16_t* dst, int len, int bit_depth) {
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const int max_y = (1 << bit_depth) - 1;
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uint64_t diff = 0;
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uint32_t tmp[4];
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int i;
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const __m128i zero = _mm_setzero_si128();
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const __m128i max = _mm_set1_epi16(max_y);
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const __m128i one = _mm_set1_epi16(1);
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__m128i sum = zero;
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for (i = 0; i + 8 <= len; i += 8) {
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const __m128i A = _mm_loadu_si128((const __m128i*)(ref + i));
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const __m128i B = _mm_loadu_si128((const __m128i*)(src + i));
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const __m128i C = _mm_loadu_si128((const __m128i*)(dst + i));
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const __m128i D = _mm_sub_epi16(A, B); // diff_y
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const __m128i E = _mm_cmpgt_epi16(zero, D); // sign (-1 or 0)
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const __m128i F = _mm_add_epi16(C, D); // new_y
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const __m128i G = _mm_or_si128(E, one); // -1 or 1
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const __m128i H = _mm_max_epi16(_mm_min_epi16(F, max), zero);
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const __m128i I = _mm_madd_epi16(D, G); // sum(abs(...))
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_mm_storeu_si128((__m128i*)(dst + i), H);
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sum = _mm_add_epi32(sum, I);
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}
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_mm_storeu_si128((__m128i*)tmp, sum);
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diff = tmp[3] + tmp[2] + tmp[1] + tmp[0];
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for (; i < len; ++i) {
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const int diff_y = ref[i] - src[i];
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const int new_y = (int)dst[i] + diff_y;
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dst[i] = clip_SSE2(new_y, max_y);
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diff += (uint64_t)abs(diff_y);
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}
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return diff;
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}
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static void SharpYuvUpdateRGB_SSE2(const int16_t* ref, const int16_t* src,
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int16_t* dst, int len) {
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int i = 0;
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for (i = 0; i + 8 <= len; i += 8) {
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const __m128i A = _mm_loadu_si128((const __m128i*)(ref + i));
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const __m128i B = _mm_loadu_si128((const __m128i*)(src + i));
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const __m128i C = _mm_loadu_si128((const __m128i*)(dst + i));
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const __m128i D = _mm_sub_epi16(A, B); // diff_uv
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const __m128i E = _mm_add_epi16(C, D); // new_uv
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_mm_storeu_si128((__m128i*)(dst + i), E);
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}
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for (; i < len; ++i) {
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const int diff_uv = ref[i] - src[i];
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dst[i] += diff_uv;
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}
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}
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static void SharpYuvFilterRow16_SSE2(const int16_t* A, const int16_t* B,
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int len, const uint16_t* best_y,
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uint16_t* out, int bit_depth) {
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const int max_y = (1 << bit_depth) - 1;
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int i;
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const __m128i kCst8 = _mm_set1_epi16(8);
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const __m128i max = _mm_set1_epi16(max_y);
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const __m128i zero = _mm_setzero_si128();
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for (i = 0; i + 8 <= len; i += 8) {
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const __m128i a0 = _mm_loadu_si128((const __m128i*)(A + i + 0));
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const __m128i a1 = _mm_loadu_si128((const __m128i*)(A + i + 1));
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const __m128i b0 = _mm_loadu_si128((const __m128i*)(B + i + 0));
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const __m128i b1 = _mm_loadu_si128((const __m128i*)(B + i + 1));
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const __m128i a0b1 = _mm_add_epi16(a0, b1);
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const __m128i a1b0 = _mm_add_epi16(a1, b0);
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const __m128i a0a1b0b1 = _mm_add_epi16(a0b1, a1b0); // A0+A1+B0+B1
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const __m128i a0a1b0b1_8 = _mm_add_epi16(a0a1b0b1, kCst8);
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const __m128i a0b1_2 = _mm_add_epi16(a0b1, a0b1); // 2*(A0+B1)
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const __m128i a1b0_2 = _mm_add_epi16(a1b0, a1b0); // 2*(A1+B0)
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const __m128i c0 = _mm_srai_epi16(_mm_add_epi16(a0b1_2, a0a1b0b1_8), 3);
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const __m128i c1 = _mm_srai_epi16(_mm_add_epi16(a1b0_2, a0a1b0b1_8), 3);
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const __m128i d0 = _mm_add_epi16(c1, a0);
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const __m128i d1 = _mm_add_epi16(c0, a1);
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const __m128i e0 = _mm_srai_epi16(d0, 1);
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const __m128i e1 = _mm_srai_epi16(d1, 1);
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const __m128i f0 = _mm_unpacklo_epi16(e0, e1);
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const __m128i f1 = _mm_unpackhi_epi16(e0, e1);
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const __m128i g0 = _mm_loadu_si128((const __m128i*)(best_y + 2 * i + 0));
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const __m128i g1 = _mm_loadu_si128((const __m128i*)(best_y + 2 * i + 8));
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const __m128i h0 = _mm_add_epi16(g0, f0);
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const __m128i h1 = _mm_add_epi16(g1, f1);
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const __m128i i0 = _mm_max_epi16(_mm_min_epi16(h0, max), zero);
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const __m128i i1 = _mm_max_epi16(_mm_min_epi16(h1, max), zero);
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_mm_storeu_si128((__m128i*)(out + 2 * i + 0), i0);
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_mm_storeu_si128((__m128i*)(out + 2 * i + 8), i1);
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}
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for (; i < len; ++i) {
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// (9 * A0 + 3 * A1 + 3 * B0 + B1 + 8) >> 4 =
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// = (8 * A0 + 2 * (A1 + B0) + (A0 + A1 + B0 + B1 + 8)) >> 4
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// We reuse the common sub-expressions.
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const int a0b1 = A[i + 0] + B[i + 1];
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const int a1b0 = A[i + 1] + B[i + 0];
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const int a0a1b0b1 = a0b1 + a1b0 + 8;
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const int v0 = (8 * A[i + 0] + 2 * a1b0 + a0a1b0b1) >> 4;
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const int v1 = (8 * A[i + 1] + 2 * a0b1 + a0a1b0b1) >> 4;
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out[2 * i + 0] = clip_SSE2(best_y[2 * i + 0] + v0, max_y);
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out[2 * i + 1] = clip_SSE2(best_y[2 * i + 1] + v1, max_y);
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}
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}
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static WEBP_INLINE __m128i s16_to_s32(__m128i in) {
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return _mm_srai_epi32(_mm_unpacklo_epi16(in, in), 16);
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}
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static void SharpYuvFilterRow32_SSE2(const int16_t* A, const int16_t* B,
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int len, const uint16_t* best_y,
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uint16_t* out, int bit_depth) {
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const int max_y = (1 << bit_depth) - 1;
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int i;
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const __m128i kCst8 = _mm_set1_epi32(8);
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const __m128i max = _mm_set1_epi16(max_y);
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const __m128i zero = _mm_setzero_si128();
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for (i = 0; i + 4 <= len; i += 4) {
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const __m128i a0 = s16_to_s32(_mm_loadl_epi64((const __m128i*)(A + i + 0)));
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const __m128i a1 = s16_to_s32(_mm_loadl_epi64((const __m128i*)(A + i + 1)));
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const __m128i b0 = s16_to_s32(_mm_loadl_epi64((const __m128i*)(B + i + 0)));
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const __m128i b1 = s16_to_s32(_mm_loadl_epi64((const __m128i*)(B + i + 1)));
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const __m128i a0b1 = _mm_add_epi32(a0, b1);
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const __m128i a1b0 = _mm_add_epi32(a1, b0);
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const __m128i a0a1b0b1 = _mm_add_epi32(a0b1, a1b0); // A0+A1+B0+B1
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const __m128i a0a1b0b1_8 = _mm_add_epi32(a0a1b0b1, kCst8);
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const __m128i a0b1_2 = _mm_add_epi32(a0b1, a0b1); // 2*(A0+B1)
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const __m128i a1b0_2 = _mm_add_epi32(a1b0, a1b0); // 2*(A1+B0)
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const __m128i c0 = _mm_srai_epi32(_mm_add_epi32(a0b1_2, a0a1b0b1_8), 3);
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const __m128i c1 = _mm_srai_epi32(_mm_add_epi32(a1b0_2, a0a1b0b1_8), 3);
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const __m128i d0 = _mm_add_epi32(c1, a0);
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const __m128i d1 = _mm_add_epi32(c0, a1);
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const __m128i e0 = _mm_srai_epi32(d0, 1);
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const __m128i e1 = _mm_srai_epi32(d1, 1);
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const __m128i f0 = _mm_unpacklo_epi32(e0, e1);
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const __m128i f1 = _mm_unpackhi_epi32(e0, e1);
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const __m128i g = _mm_loadu_si128((const __m128i*)(best_y + 2 * i + 0));
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const __m128i h_16 = _mm_add_epi16(g, _mm_packs_epi32(f0, f1));
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const __m128i final = _mm_max_epi16(_mm_min_epi16(h_16, max), zero);
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_mm_storeu_si128((__m128i*)(out + 2 * i + 0), final);
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}
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for (; i < len; ++i) {
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// (9 * A0 + 3 * A1 + 3 * B0 + B1 + 8) >> 4 =
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// = (8 * A0 + 2 * (A1 + B0) + (A0 + A1 + B0 + B1 + 8)) >> 4
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// We reuse the common sub-expressions.
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const int a0b1 = A[i + 0] + B[i + 1];
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const int a1b0 = A[i + 1] + B[i + 0];
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const int a0a1b0b1 = a0b1 + a1b0 + 8;
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const int v0 = (8 * A[i + 0] + 2 * a1b0 + a0a1b0b1) >> 4;
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const int v1 = (8 * A[i + 1] + 2 * a0b1 + a0a1b0b1) >> 4;
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out[2 * i + 0] = clip_SSE2(best_y[2 * i + 0] + v0, max_y);
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out[2 * i + 1] = clip_SSE2(best_y[2 * i + 1] + v1, max_y);
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}
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}
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static void SharpYuvFilterRow_SSE2(const int16_t* A, const int16_t* B, int len,
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const uint16_t* best_y, uint16_t* out,
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int bit_depth) {
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if (bit_depth <= 10) {
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SharpYuvFilterRow16_SSE2(A, B, len, best_y, out, bit_depth);
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} else {
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SharpYuvFilterRow32_SSE2(A, B, len, best_y, out, bit_depth);
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}
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}
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//------------------------------------------------------------------------------
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extern void InitSharpYuvSSE2(void);
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WEBP_TSAN_IGNORE_FUNCTION void InitSharpYuvSSE2(void) {
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SharpYuvUpdateY = SharpYuvUpdateY_SSE2;
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SharpYuvUpdateRGB = SharpYuvUpdateRGB_SSE2;
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SharpYuvFilterRow = SharpYuvFilterRow_SSE2;
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}
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#else // !WEBP_USE_SSE2
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extern void InitSharpYuvSSE2(void);
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void InitSharpYuvSSE2(void) {}
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#endif // WEBP_USE_SSE2
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