mirror of
https://github.com/webmproject/libwebp.git
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1a338fb306
direct translation from sse2; minor gain, fewer instructions Change-Id: I60288a842fac1a686b82b5cab637931789fe29f2
427 lines
16 KiB
C
427 lines
16 KiB
C
// Copyright 2015 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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// SSE4 version of some encoding functions.
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_SSE41)
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#include <smmintrin.h>
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#include <stdlib.h> // for abs()
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#include "../enc/vp8enci.h"
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//------------------------------------------------------------------------------
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// Compute susceptibility based on DCT-coeff histograms.
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static void CollectHistogram(const uint8_t* ref, const uint8_t* pred,
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int start_block, int end_block,
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VP8Histogram* const histo) {
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const __m128i max_coeff_thresh = _mm_set1_epi16(MAX_COEFF_THRESH);
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int j;
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int distribution[MAX_COEFF_THRESH + 1] = { 0 };
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for (j = start_block; j < end_block; ++j) {
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int16_t out[16];
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int k;
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VP8FTransform(ref + VP8DspScan[j], pred + VP8DspScan[j], out);
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// Convert coefficients to bin (within out[]).
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{
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// Load.
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const __m128i out0 = _mm_loadu_si128((__m128i*)&out[0]);
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const __m128i out1 = _mm_loadu_si128((__m128i*)&out[8]);
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// v = abs(out) >> 3
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const __m128i abs0 = _mm_abs_epi16(out0);
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const __m128i abs1 = _mm_abs_epi16(out1);
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const __m128i v0 = _mm_srai_epi16(abs0, 3);
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const __m128i v1 = _mm_srai_epi16(abs1, 3);
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// bin = min(v, MAX_COEFF_THRESH)
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const __m128i bin0 = _mm_min_epi16(v0, max_coeff_thresh);
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const __m128i bin1 = _mm_min_epi16(v1, max_coeff_thresh);
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// Store.
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_mm_storeu_si128((__m128i*)&out[0], bin0);
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_mm_storeu_si128((__m128i*)&out[8], bin1);
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}
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// Convert coefficients to bin.
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for (k = 0; k < 16; ++k) {
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++distribution[out[k]];
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}
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}
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VP8SetHistogramData(distribution, histo);
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}
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//------------------------------------------------------------------------------
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// Metric
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static WEBP_INLINE __m128i SubtractAndAccumulate(const __m128i a,
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const __m128i b) {
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// take abs(a-b) in 8b
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const __m128i a_b = _mm_subs_epu8(a, b);
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const __m128i b_a = _mm_subs_epu8(b, a);
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const __m128i abs_a_b = _mm_or_si128(a_b, b_a);
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// zero-extend to 16b
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const __m128i C0 = _mm_cvtepu8_epi16(abs_a_b);
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const __m128i C1 = _mm_cvtepu8_epi16(_mm_srli_si128(abs_a_b, 8));
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// multiply with self
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const __m128i D0 = _mm_madd_epi16(C0, C0);
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const __m128i D1 = _mm_madd_epi16(C1, C1);
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// accumulate
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const __m128i sum = _mm_add_epi32(D0, D1);
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return sum;
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}
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static int SSE_16xN(const uint8_t* a, const uint8_t* b, int num_pairs) {
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__m128i sum = _mm_setzero_si128();
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int32_t tmp[4];
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while (num_pairs-- > 0) {
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const __m128i a0 = _mm_loadu_si128((const __m128i*)&a[BPS * 0]);
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const __m128i a1 = _mm_loadu_si128((const __m128i*)&a[BPS * 1]);
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const __m128i b0 = _mm_loadu_si128((const __m128i*)&b[BPS * 0]);
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const __m128i b1 = _mm_loadu_si128((const __m128i*)&b[BPS * 1]);
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const __m128i sum1 = SubtractAndAccumulate(a0, b0);
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const __m128i sum2 = SubtractAndAccumulate(a1, b1);
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const __m128i sum12 = _mm_add_epi32(sum1, sum2);
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sum = _mm_add_epi32(sum, sum12);
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a += 2 * BPS;
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b += 2 * BPS;
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}
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_mm_storeu_si128((__m128i*)tmp, sum);
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return (tmp[3] + tmp[2] + tmp[1] + tmp[0]);
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}
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static int SSE16x16(const uint8_t* a, const uint8_t* b) {
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return SSE_16xN(a, b, 8);
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}
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static int SSE16x8(const uint8_t* a, const uint8_t* b) {
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return SSE_16xN(a, b, 4);
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}
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//------------------------------------------------------------------------------
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// Texture distortion
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//
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// We try to match the spectral content (weighted) between source and
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// reconstructed samples.
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// Hadamard transform
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// Returns the difference between the weighted sum of the absolute value of
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// transformed coefficients.
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static int TTransform(const uint8_t* inA, const uint8_t* inB,
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const uint16_t* const w) {
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__m128i tmp_0, tmp_1, tmp_2, tmp_3;
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// Load, combine and transpose inputs.
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{
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const __m128i inA_0 = _mm_loadl_epi64((const __m128i*)&inA[BPS * 0]);
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const __m128i inA_1 = _mm_loadl_epi64((const __m128i*)&inA[BPS * 1]);
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const __m128i inA_2 = _mm_loadl_epi64((const __m128i*)&inA[BPS * 2]);
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const __m128i inA_3 = _mm_loadl_epi64((const __m128i*)&inA[BPS * 3]);
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const __m128i inB_0 = _mm_loadl_epi64((const __m128i*)&inB[BPS * 0]);
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const __m128i inB_1 = _mm_loadl_epi64((const __m128i*)&inB[BPS * 1]);
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const __m128i inB_2 = _mm_loadl_epi64((const __m128i*)&inB[BPS * 2]);
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const __m128i inB_3 = _mm_loadl_epi64((const __m128i*)&inB[BPS * 3]);
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// Combine inA and inB (we'll do two transforms in parallel).
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const __m128i inAB_0 = _mm_unpacklo_epi8(inA_0, inB_0);
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const __m128i inAB_1 = _mm_unpacklo_epi8(inA_1, inB_1);
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const __m128i inAB_2 = _mm_unpacklo_epi8(inA_2, inB_2);
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const __m128i inAB_3 = _mm_unpacklo_epi8(inA_3, inB_3);
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// a00 b00 a01 b01 a02 b03 a03 b03 0 0 0 0 0 0 0 0
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// a10 b10 a11 b11 a12 b12 a13 b13 0 0 0 0 0 0 0 0
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// a20 b20 a21 b21 a22 b22 a23 b23 0 0 0 0 0 0 0 0
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// a30 b30 a31 b31 a32 b32 a33 b33 0 0 0 0 0 0 0 0
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// Transpose the two 4x4, discarding the filling zeroes.
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const __m128i transpose0_0 = _mm_unpacklo_epi8(inAB_0, inAB_2);
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const __m128i transpose0_1 = _mm_unpacklo_epi8(inAB_1, inAB_3);
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// a00 a20 b00 b20 a01 a21 b01 b21 a02 a22 b02 b22 a03 a23 b03 b23
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// a10 a30 b10 b30 a11 a31 b11 b31 a12 a32 b12 b32 a13 a33 b13 b33
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const __m128i transpose1_0 = _mm_unpacklo_epi8(transpose0_0, transpose0_1);
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const __m128i transpose1_1 = _mm_unpackhi_epi8(transpose0_0, transpose0_1);
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// a00 a10 a20 a30 b00 b10 b20 b30 a01 a11 a21 a31 b01 b11 b21 b31
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// a02 a12 a22 a32 b02 b12 b22 b32 a03 a13 a23 a33 b03 b13 b23 b33
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// Convert to 16b.
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tmp_0 = _mm_cvtepu8_epi16(transpose1_0);
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tmp_1 = _mm_cvtepu8_epi16(_mm_srli_si128(transpose1_0, 8));
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tmp_2 = _mm_cvtepu8_epi16(transpose1_1);
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tmp_3 = _mm_cvtepu8_epi16(_mm_srli_si128(transpose1_1, 8));
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// a00 a10 a20 a30 b00 b10 b20 b30
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// a01 a11 a21 a31 b01 b11 b21 b31
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// a02 a12 a22 a32 b02 b12 b22 b32
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// a03 a13 a23 a33 b03 b13 b23 b33
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}
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// Horizontal pass and subsequent transpose.
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{
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// Calculate a and b (two 4x4 at once).
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const __m128i a0 = _mm_add_epi16(tmp_0, tmp_2);
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const __m128i a1 = _mm_add_epi16(tmp_1, tmp_3);
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const __m128i a2 = _mm_sub_epi16(tmp_1, tmp_3);
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const __m128i a3 = _mm_sub_epi16(tmp_0, tmp_2);
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const __m128i b0 = _mm_add_epi16(a0, a1);
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const __m128i b1 = _mm_add_epi16(a3, a2);
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const __m128i b2 = _mm_sub_epi16(a3, a2);
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const __m128i b3 = _mm_sub_epi16(a0, a1);
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// a00 a01 a02 a03 b00 b01 b02 b03
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// a10 a11 a12 a13 b10 b11 b12 b13
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// a20 a21 a22 a23 b20 b21 b22 b23
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// a30 a31 a32 a33 b30 b31 b32 b33
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// Transpose the two 4x4.
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const __m128i transpose0_0 = _mm_unpacklo_epi16(b0, b1);
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const __m128i transpose0_1 = _mm_unpacklo_epi16(b2, b3);
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const __m128i transpose0_2 = _mm_unpackhi_epi16(b0, b1);
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const __m128i transpose0_3 = _mm_unpackhi_epi16(b2, b3);
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// a00 a10 a01 a11 a02 a12 a03 a13
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// a20 a30 a21 a31 a22 a32 a23 a33
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// b00 b10 b01 b11 b02 b12 b03 b13
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// b20 b30 b21 b31 b22 b32 b23 b33
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const __m128i transpose1_0 = _mm_unpacklo_epi32(transpose0_0, transpose0_1);
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const __m128i transpose1_1 = _mm_unpacklo_epi32(transpose0_2, transpose0_3);
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const __m128i transpose1_2 = _mm_unpackhi_epi32(transpose0_0, transpose0_1);
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const __m128i transpose1_3 = _mm_unpackhi_epi32(transpose0_2, transpose0_3);
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// a00 a10 a20 a30 a01 a11 a21 a31
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// b00 b10 b20 b30 b01 b11 b21 b31
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// a02 a12 a22 a32 a03 a13 a23 a33
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// b02 b12 a22 b32 b03 b13 b23 b33
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tmp_0 = _mm_unpacklo_epi64(transpose1_0, transpose1_1);
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tmp_1 = _mm_unpackhi_epi64(transpose1_0, transpose1_1);
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tmp_2 = _mm_unpacklo_epi64(transpose1_2, transpose1_3);
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tmp_3 = _mm_unpackhi_epi64(transpose1_2, transpose1_3);
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// a00 a10 a20 a30 b00 b10 b20 b30
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// a01 a11 a21 a31 b01 b11 b21 b31
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// a02 a12 a22 a32 b02 b12 b22 b32
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// a03 a13 a23 a33 b03 b13 b23 b33
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}
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// Vertical pass and difference of weighted sums.
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{
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// Load all inputs.
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const __m128i w_0 = _mm_loadu_si128((const __m128i*)&w[0]);
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const __m128i w_8 = _mm_loadu_si128((const __m128i*)&w[8]);
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// Calculate a and b (two 4x4 at once).
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const __m128i a0 = _mm_add_epi16(tmp_0, tmp_2);
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const __m128i a1 = _mm_add_epi16(tmp_1, tmp_3);
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const __m128i a2 = _mm_sub_epi16(tmp_1, tmp_3);
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const __m128i a3 = _mm_sub_epi16(tmp_0, tmp_2);
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const __m128i b0 = _mm_add_epi16(a0, a1);
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const __m128i b1 = _mm_add_epi16(a3, a2);
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const __m128i b2 = _mm_sub_epi16(a3, a2);
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const __m128i b3 = _mm_sub_epi16(a0, a1);
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// Separate the transforms of inA and inB.
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__m128i A_b0 = _mm_unpacklo_epi64(b0, b1);
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__m128i A_b2 = _mm_unpacklo_epi64(b2, b3);
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__m128i B_b0 = _mm_unpackhi_epi64(b0, b1);
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__m128i B_b2 = _mm_unpackhi_epi64(b2, b3);
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A_b0 = _mm_abs_epi16(A_b0);
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A_b2 = _mm_abs_epi16(A_b2);
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B_b0 = _mm_abs_epi16(B_b0);
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B_b2 = _mm_abs_epi16(B_b2);
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// weighted sums
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A_b0 = _mm_madd_epi16(A_b0, w_0);
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A_b2 = _mm_madd_epi16(A_b2, w_8);
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B_b0 = _mm_madd_epi16(B_b0, w_0);
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B_b2 = _mm_madd_epi16(B_b2, w_8);
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A_b0 = _mm_add_epi32(A_b0, A_b2);
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B_b0 = _mm_add_epi32(B_b0, B_b2);
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// difference of weighted sums
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A_b2 = _mm_sub_epi32(A_b0, B_b0);
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// cascading summation of the differences
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B_b0 = _mm_hadd_epi32(A_b2, A_b2);
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B_b2 = _mm_hadd_epi32(B_b0, B_b0);
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return _mm_cvtsi128_si32(B_b2);
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}
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}
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static int Disto4x4(const uint8_t* const a, const uint8_t* const b,
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const uint16_t* const w) {
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const int diff_sum = TTransform(a, b, w);
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return abs(diff_sum) >> 5;
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}
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static int Disto16x16(const uint8_t* const a, const uint8_t* const b,
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const uint16_t* const w) {
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int D = 0;
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int x, y;
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for (y = 0; y < 16 * BPS; y += 4 * BPS) {
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for (x = 0; x < 16; x += 4) {
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D += Disto4x4(a + x + y, b + x + y, w);
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}
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}
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return D;
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}
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//------------------------------------------------------------------------------
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// Quantization
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//
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// Generates a pshufb constant for shuffling 16b words.
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#define PSHUFB_CST(A,B,C,D,E,F,G,H) \
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_mm_set_epi8(2 * (H) + 1, 2 * (H) + 0, 2 * (G) + 1, 2 * (G) + 0, \
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2 * (F) + 1, 2 * (F) + 0, 2 * (E) + 1, 2 * (E) + 0, \
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2 * (D) + 1, 2 * (D) + 0, 2 * (C) + 1, 2 * (C) + 0, \
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2 * (B) + 1, 2 * (B) + 0, 2 * (A) + 1, 2 * (A) + 0)
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static WEBP_INLINE int DoQuantizeBlock(int16_t in[16], int16_t out[16],
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const uint16_t* const sharpen,
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const VP8Matrix* const mtx) {
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const __m128i max_coeff_2047 = _mm_set1_epi16(MAX_LEVEL);
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const __m128i zero = _mm_setzero_si128();
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__m128i out0, out8;
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__m128i packed_out;
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// Load all inputs.
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// TODO(cduvivier): Make variable declarations and allocations aligned so that
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// we can use _mm_load_si128 instead of _mm_loadu_si128.
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__m128i in0 = _mm_loadu_si128((__m128i*)&in[0]);
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__m128i in8 = _mm_loadu_si128((__m128i*)&in[8]);
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const __m128i iq0 = _mm_loadu_si128((const __m128i*)&mtx->iq_[0]);
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const __m128i iq8 = _mm_loadu_si128((const __m128i*)&mtx->iq_[8]);
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const __m128i q0 = _mm_loadu_si128((const __m128i*)&mtx->q_[0]);
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const __m128i q8 = _mm_loadu_si128((const __m128i*)&mtx->q_[8]);
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// coeff = abs(in)
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__m128i coeff0 = _mm_abs_epi16(in0);
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__m128i coeff8 = _mm_abs_epi16(in8);
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// coeff = abs(in) + sharpen
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if (sharpen != NULL) {
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const __m128i sharpen0 = _mm_loadu_si128((const __m128i*)&sharpen[0]);
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const __m128i sharpen8 = _mm_loadu_si128((const __m128i*)&sharpen[8]);
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coeff0 = _mm_add_epi16(coeff0, sharpen0);
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coeff8 = _mm_add_epi16(coeff8, sharpen8);
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}
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// out = (coeff * iQ + B) >> QFIX
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{
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// doing calculations with 32b precision (QFIX=17)
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// out = (coeff * iQ)
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const __m128i coeff_iQ0H = _mm_mulhi_epu16(coeff0, iq0);
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const __m128i coeff_iQ0L = _mm_mullo_epi16(coeff0, iq0);
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const __m128i coeff_iQ8H = _mm_mulhi_epu16(coeff8, iq8);
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const __m128i coeff_iQ8L = _mm_mullo_epi16(coeff8, iq8);
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__m128i out_00 = _mm_unpacklo_epi16(coeff_iQ0L, coeff_iQ0H);
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__m128i out_04 = _mm_unpackhi_epi16(coeff_iQ0L, coeff_iQ0H);
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__m128i out_08 = _mm_unpacklo_epi16(coeff_iQ8L, coeff_iQ8H);
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__m128i out_12 = _mm_unpackhi_epi16(coeff_iQ8L, coeff_iQ8H);
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// out = (coeff * iQ + B)
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const __m128i bias_00 = _mm_loadu_si128((const __m128i*)&mtx->bias_[0]);
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const __m128i bias_04 = _mm_loadu_si128((const __m128i*)&mtx->bias_[4]);
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const __m128i bias_08 = _mm_loadu_si128((const __m128i*)&mtx->bias_[8]);
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const __m128i bias_12 = _mm_loadu_si128((const __m128i*)&mtx->bias_[12]);
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out_00 = _mm_add_epi32(out_00, bias_00);
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out_04 = _mm_add_epi32(out_04, bias_04);
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out_08 = _mm_add_epi32(out_08, bias_08);
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out_12 = _mm_add_epi32(out_12, bias_12);
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// out = QUANTDIV(coeff, iQ, B, QFIX)
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out_00 = _mm_srai_epi32(out_00, QFIX);
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out_04 = _mm_srai_epi32(out_04, QFIX);
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out_08 = _mm_srai_epi32(out_08, QFIX);
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out_12 = _mm_srai_epi32(out_12, QFIX);
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// pack result as 16b
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out0 = _mm_packs_epi32(out_00, out_04);
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out8 = _mm_packs_epi32(out_08, out_12);
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|
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|
// if (coeff > 2047) coeff = 2047
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|
out0 = _mm_min_epi16(out0, max_coeff_2047);
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|
out8 = _mm_min_epi16(out8, max_coeff_2047);
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|
}
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|
|
|
// put sign back
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|
out0 = _mm_sign_epi16(out0, in0);
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|
out8 = _mm_sign_epi16(out8, in8);
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|
|
|
// in = out * Q
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|
in0 = _mm_mullo_epi16(out0, q0);
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|
in8 = _mm_mullo_epi16(out8, q8);
|
|
|
|
_mm_storeu_si128((__m128i*)&in[0], in0);
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|
_mm_storeu_si128((__m128i*)&in[8], in8);
|
|
|
|
// zigzag the output before storing it. The re-ordering is:
|
|
// 0 1 2 3 4 5 6 7 | 8 9 10 11 12 13 14 15
|
|
// -> 0 1 4[8]5 2 3 6 | 9 12 13 10 [7]11 14 15
|
|
// There's only two misplaced entries ([8] and [7]) that are crossing the
|
|
// reg's boundaries.
|
|
// We use pshufb instead of pshuflo/pshufhi.
|
|
{
|
|
const __m128i kCst_lo = PSHUFB_CST(0, 1, 4, -1, 5, 2, 3, 6);
|
|
const __m128i kCst_7 = PSHUFB_CST(-1, -1, -1, -1, 7, -1, -1, -1);
|
|
const __m128i tmp_lo = _mm_shuffle_epi8(out0, kCst_lo);
|
|
const __m128i tmp_7 = _mm_shuffle_epi8(out0, kCst_7); // extract #7
|
|
const __m128i kCst_hi = PSHUFB_CST(1, 4, 5, 2, -1, 3, 6, 7);
|
|
const __m128i kCst_8 = PSHUFB_CST(-1, -1, -1, 0, -1, -1, -1, -1);
|
|
const __m128i tmp_hi = _mm_shuffle_epi8(out8, kCst_hi);
|
|
const __m128i tmp_8 = _mm_shuffle_epi8(out8, kCst_8); // extract #8
|
|
const __m128i out_z0 = _mm_or_si128(tmp_lo, tmp_8);
|
|
const __m128i out_z8 = _mm_or_si128(tmp_hi, tmp_7);
|
|
_mm_storeu_si128((__m128i*)&out[0], out_z0);
|
|
_mm_storeu_si128((__m128i*)&out[8], out_z8);
|
|
packed_out = _mm_packs_epi16(out_z0, out_z8);
|
|
}
|
|
|
|
// detect if all 'out' values are zeroes or not
|
|
return (_mm_movemask_epi8(_mm_cmpeq_epi8(packed_out, zero)) != 0xffff);
|
|
}
|
|
|
|
#undef PSHUFB_CST
|
|
|
|
static int QuantizeBlock(int16_t in[16], int16_t out[16],
|
|
const VP8Matrix* const mtx) {
|
|
return DoQuantizeBlock(in, out, &mtx->sharpen_[0], mtx);
|
|
}
|
|
|
|
static int QuantizeBlockWHT(int16_t in[16], int16_t out[16],
|
|
const VP8Matrix* const mtx) {
|
|
return DoQuantizeBlock(in, out, NULL, mtx);
|
|
}
|
|
|
|
static int Quantize2Blocks(int16_t in[32], int16_t out[32],
|
|
const VP8Matrix* const mtx) {
|
|
int nz;
|
|
const uint16_t* const sharpen = &mtx->sharpen_[0];
|
|
nz = DoQuantizeBlock(in + 0 * 16, out + 0 * 16, sharpen, mtx) << 0;
|
|
nz |= DoQuantizeBlock(in + 1 * 16, out + 1 * 16, sharpen, mtx) << 1;
|
|
return nz;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Entry point
|
|
|
|
extern void VP8EncDspInitSSE41(void);
|
|
WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitSSE41(void) {
|
|
VP8CollectHistogram = CollectHistogram;
|
|
VP8EncQuantizeBlock = QuantizeBlock;
|
|
VP8EncQuantize2Blocks = Quantize2Blocks;
|
|
VP8EncQuantizeBlockWHT = QuantizeBlockWHT;
|
|
VP8SSE16x16 = SSE16x16;
|
|
VP8SSE16x8 = SSE16x8;
|
|
VP8TDisto4x4 = Disto4x4;
|
|
VP8TDisto16x16 = Disto16x16;
|
|
}
|
|
|
|
#else // !WEBP_USE_SSE41
|
|
|
|
extern void VP8EncDspInitSSE41(void);
|
|
WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitSSE41(void) {}
|
|
|
|
#endif // WEBP_USE_SSE41
|