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Unified Diff: third_party/libwebp/dsp/enc_sse2.c

Issue 1178013008: Use the upstream version of libwebp, v0.4.3. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Fixes for SkWebpImageDecoder and SkWebpCodec. Created 5 years, 6 months ago
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Index: third_party/libwebp/dsp/enc_sse2.c
diff --git a/third_party/libwebp/dsp/enc_sse2.c b/third_party/libwebp/dsp/enc_sse2.c
new file mode 100644
index 0000000000000000000000000000000000000000..9958d9f6ff6dfab7a73d3e8237d1629be96665de
--- /dev/null
+++ b/third_party/libwebp/dsp/enc_sse2.c
@@ -0,0 +1,982 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING 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.
+// -----------------------------------------------------------------------------
+//
+// SSE2 version of speed-critical encoding functions.
+//
+// Author: Christian Duvivier (cduvivier@google.com)
+
+#include "./dsp.h"
+
+#if defined(WEBP_USE_SSE2)
+#include <stdlib.h> // for abs()
+#include <emmintrin.h>
+
+#include "../enc/cost.h"
+#include "../enc/vp8enci.h"
+#include "../utils/utils.h"
+
+//------------------------------------------------------------------------------
+// Quite useful macro for debugging. Left here for convenience.
+
+#if 0
+#include <stdio.h>
+static void PrintReg(const __m128i r, const char* const name, int size) {
+ int n;
+ union {
+ __m128i r;
+ uint8_t i8[16];
+ uint16_t i16[8];
+ uint32_t i32[4];
+ uint64_t i64[2];
+ } tmp;
+ tmp.r = r;
+ printf("%s\t: ", name);
+ if (size == 8) {
+ for (n = 0; n < 16; ++n) printf("%.2x ", tmp.i8[n]);
+ } else if (size == 16) {
+ for (n = 0; n < 8; ++n) printf("%.4x ", tmp.i16[n]);
+ } else if (size == 32) {
+ for (n = 0; n < 4; ++n) printf("%.8x ", tmp.i32[n]);
+ } else {
+ for (n = 0; n < 2; ++n) printf("%.16lx ", tmp.i64[n]);
+ }
+ printf("\n");
+}
+#endif
+
+//------------------------------------------------------------------------------
+// Compute susceptibility based on DCT-coeff histograms:
+// the higher, the "easier" the macroblock is to compress.
+
+static void CollectHistogram(const uint8_t* ref, const uint8_t* pred,
+ int start_block, int end_block,
+ VP8Histogram* const histo) {
+ const __m128i max_coeff_thresh = _mm_set1_epi16(MAX_COEFF_THRESH);
+ int j;
+ for (j = start_block; j < end_block; ++j) {
+ int16_t out[16];
+ int k;
+
+ VP8FTransform(ref + VP8DspScan[j], pred + VP8DspScan[j], out);
+
+ // Convert coefficients to bin (within out[]).
+ {
+ // Load.
+ const __m128i out0 = _mm_loadu_si128((__m128i*)&out[0]);
+ const __m128i out1 = _mm_loadu_si128((__m128i*)&out[8]);
+ // sign(out) = out >> 15 (0x0000 if positive, 0xffff if negative)
+ const __m128i sign0 = _mm_srai_epi16(out0, 15);
+ const __m128i sign1 = _mm_srai_epi16(out1, 15);
+ // abs(out) = (out ^ sign) - sign
+ const __m128i xor0 = _mm_xor_si128(out0, sign0);
+ const __m128i xor1 = _mm_xor_si128(out1, sign1);
+ const __m128i abs0 = _mm_sub_epi16(xor0, sign0);
+ const __m128i abs1 = _mm_sub_epi16(xor1, sign1);
+ // v = abs(out) >> 3
+ const __m128i v0 = _mm_srai_epi16(abs0, 3);
+ const __m128i v1 = _mm_srai_epi16(abs1, 3);
+ // bin = min(v, MAX_COEFF_THRESH)
+ const __m128i bin0 = _mm_min_epi16(v0, max_coeff_thresh);
+ const __m128i bin1 = _mm_min_epi16(v1, max_coeff_thresh);
+ // Store.
+ _mm_storeu_si128((__m128i*)&out[0], bin0);
+ _mm_storeu_si128((__m128i*)&out[8], bin1);
+ }
+
+ // Convert coefficients to bin.
+ for (k = 0; k < 16; ++k) {
+ histo->distribution[out[k]]++;
+ }
+ }
+}
+
+//------------------------------------------------------------------------------
+// Transforms (Paragraph 14.4)
+
+// Does one or two inverse transforms.
+static void ITransform(const uint8_t* ref, const int16_t* in, uint8_t* dst,
+ int do_two) {
+ // This implementation makes use of 16-bit fixed point versions of two
+ // multiply constants:
+ // K1 = sqrt(2) * cos (pi/8) ~= 85627 / 2^16
+ // K2 = sqrt(2) * sin (pi/8) ~= 35468 / 2^16
+ //
+ // To be able to use signed 16-bit integers, we use the following trick to
+ // have constants within range:
+ // - Associated constants are obtained by subtracting the 16-bit fixed point
+ // version of one:
+ // k = K - (1 << 16) => K = k + (1 << 16)
+ // K1 = 85267 => k1 = 20091
+ // K2 = 35468 => k2 = -30068
+ // - The multiplication of a variable by a constant become the sum of the
+ // variable and the multiplication of that variable by the associated
+ // constant:
+ // (x * K) >> 16 = (x * (k + (1 << 16))) >> 16 = ((x * k ) >> 16) + x
+ const __m128i k1 = _mm_set1_epi16(20091);
+ const __m128i k2 = _mm_set1_epi16(-30068);
+ __m128i T0, T1, T2, T3;
+
+ // Load and concatenate the transform coefficients (we'll do two inverse
+ // transforms in parallel). In the case of only one inverse transform, the
+ // second half of the vectors will just contain random value we'll never
+ // use nor store.
+ __m128i in0, in1, in2, in3;
+ {
+ in0 = _mm_loadl_epi64((__m128i*)&in[0]);
+ in1 = _mm_loadl_epi64((__m128i*)&in[4]);
+ in2 = _mm_loadl_epi64((__m128i*)&in[8]);
+ in3 = _mm_loadl_epi64((__m128i*)&in[12]);
+ // a00 a10 a20 a30 x x x x
+ // a01 a11 a21 a31 x x x x
+ // a02 a12 a22 a32 x x x x
+ // a03 a13 a23 a33 x x x x
+ if (do_two) {
+ const __m128i inB0 = _mm_loadl_epi64((__m128i*)&in[16]);
+ const __m128i inB1 = _mm_loadl_epi64((__m128i*)&in[20]);
+ const __m128i inB2 = _mm_loadl_epi64((__m128i*)&in[24]);
+ const __m128i inB3 = _mm_loadl_epi64((__m128i*)&in[28]);
+ in0 = _mm_unpacklo_epi64(in0, inB0);
+ in1 = _mm_unpacklo_epi64(in1, inB1);
+ in2 = _mm_unpacklo_epi64(in2, inB2);
+ in3 = _mm_unpacklo_epi64(in3, inB3);
+ // a00 a10 a20 a30 b00 b10 b20 b30
+ // a01 a11 a21 a31 b01 b11 b21 b31
+ // a02 a12 a22 a32 b02 b12 b22 b32
+ // a03 a13 a23 a33 b03 b13 b23 b33
+ }
+ }
+
+ // Vertical pass and subsequent transpose.
+ {
+ // First pass, c and d calculations are longer because of the "trick"
+ // multiplications.
+ const __m128i a = _mm_add_epi16(in0, in2);
+ const __m128i b = _mm_sub_epi16(in0, in2);
+ // c = MUL(in1, K2) - MUL(in3, K1) = MUL(in1, k2) - MUL(in3, k1) + in1 - in3
+ const __m128i c1 = _mm_mulhi_epi16(in1, k2);
+ const __m128i c2 = _mm_mulhi_epi16(in3, k1);
+ const __m128i c3 = _mm_sub_epi16(in1, in3);
+ const __m128i c4 = _mm_sub_epi16(c1, c2);
+ const __m128i c = _mm_add_epi16(c3, c4);
+ // d = MUL(in1, K1) + MUL(in3, K2) = MUL(in1, k1) + MUL(in3, k2) + in1 + in3
+ const __m128i d1 = _mm_mulhi_epi16(in1, k1);
+ const __m128i d2 = _mm_mulhi_epi16(in3, k2);
+ const __m128i d3 = _mm_add_epi16(in1, in3);
+ const __m128i d4 = _mm_add_epi16(d1, d2);
+ const __m128i d = _mm_add_epi16(d3, d4);
+
+ // Second pass.
+ const __m128i tmp0 = _mm_add_epi16(a, d);
+ const __m128i tmp1 = _mm_add_epi16(b, c);
+ const __m128i tmp2 = _mm_sub_epi16(b, c);
+ const __m128i tmp3 = _mm_sub_epi16(a, d);
+
+ // Transpose the two 4x4.
+ // a00 a01 a02 a03 b00 b01 b02 b03
+ // a10 a11 a12 a13 b10 b11 b12 b13
+ // a20 a21 a22 a23 b20 b21 b22 b23
+ // a30 a31 a32 a33 b30 b31 b32 b33
+ const __m128i transpose0_0 = _mm_unpacklo_epi16(tmp0, tmp1);
+ const __m128i transpose0_1 = _mm_unpacklo_epi16(tmp2, tmp3);
+ const __m128i transpose0_2 = _mm_unpackhi_epi16(tmp0, tmp1);
+ const __m128i transpose0_3 = _mm_unpackhi_epi16(tmp2, tmp3);
+ // a00 a10 a01 a11 a02 a12 a03 a13
+ // a20 a30 a21 a31 a22 a32 a23 a33
+ // b00 b10 b01 b11 b02 b12 b03 b13
+ // b20 b30 b21 b31 b22 b32 b23 b33
+ const __m128i transpose1_0 = _mm_unpacklo_epi32(transpose0_0, transpose0_1);
+ const __m128i transpose1_1 = _mm_unpacklo_epi32(transpose0_2, transpose0_3);
+ const __m128i transpose1_2 = _mm_unpackhi_epi32(transpose0_0, transpose0_1);
+ const __m128i transpose1_3 = _mm_unpackhi_epi32(transpose0_2, transpose0_3);
+ // a00 a10 a20 a30 a01 a11 a21 a31
+ // b00 b10 b20 b30 b01 b11 b21 b31
+ // a02 a12 a22 a32 a03 a13 a23 a33
+ // b02 b12 a22 b32 b03 b13 b23 b33
+ T0 = _mm_unpacklo_epi64(transpose1_0, transpose1_1);
+ T1 = _mm_unpackhi_epi64(transpose1_0, transpose1_1);
+ T2 = _mm_unpacklo_epi64(transpose1_2, transpose1_3);
+ T3 = _mm_unpackhi_epi64(transpose1_2, transpose1_3);
+ // a00 a10 a20 a30 b00 b10 b20 b30
+ // a01 a11 a21 a31 b01 b11 b21 b31
+ // a02 a12 a22 a32 b02 b12 b22 b32
+ // a03 a13 a23 a33 b03 b13 b23 b33
+ }
+
+ // Horizontal pass and subsequent transpose.
+ {
+ // First pass, c and d calculations are longer because of the "trick"
+ // multiplications.
+ const __m128i four = _mm_set1_epi16(4);
+ const __m128i dc = _mm_add_epi16(T0, four);
+ const __m128i a = _mm_add_epi16(dc, T2);
+ const __m128i b = _mm_sub_epi16(dc, T2);
+ // c = MUL(T1, K2) - MUL(T3, K1) = MUL(T1, k2) - MUL(T3, k1) + T1 - T3
+ const __m128i c1 = _mm_mulhi_epi16(T1, k2);
+ const __m128i c2 = _mm_mulhi_epi16(T3, k1);
+ const __m128i c3 = _mm_sub_epi16(T1, T3);
+ const __m128i c4 = _mm_sub_epi16(c1, c2);
+ const __m128i c = _mm_add_epi16(c3, c4);
+ // d = MUL(T1, K1) + MUL(T3, K2) = MUL(T1, k1) + MUL(T3, k2) + T1 + T3
+ const __m128i d1 = _mm_mulhi_epi16(T1, k1);
+ const __m128i d2 = _mm_mulhi_epi16(T3, k2);
+ const __m128i d3 = _mm_add_epi16(T1, T3);
+ const __m128i d4 = _mm_add_epi16(d1, d2);
+ const __m128i d = _mm_add_epi16(d3, d4);
+
+ // Second pass.
+ const __m128i tmp0 = _mm_add_epi16(a, d);
+ const __m128i tmp1 = _mm_add_epi16(b, c);
+ const __m128i tmp2 = _mm_sub_epi16(b, c);
+ const __m128i tmp3 = _mm_sub_epi16(a, d);
+ const __m128i shifted0 = _mm_srai_epi16(tmp0, 3);
+ const __m128i shifted1 = _mm_srai_epi16(tmp1, 3);
+ const __m128i shifted2 = _mm_srai_epi16(tmp2, 3);
+ const __m128i shifted3 = _mm_srai_epi16(tmp3, 3);
+
+ // Transpose the two 4x4.
+ // a00 a01 a02 a03 b00 b01 b02 b03
+ // a10 a11 a12 a13 b10 b11 b12 b13
+ // a20 a21 a22 a23 b20 b21 b22 b23
+ // a30 a31 a32 a33 b30 b31 b32 b33
+ const __m128i transpose0_0 = _mm_unpacklo_epi16(shifted0, shifted1);
+ const __m128i transpose0_1 = _mm_unpacklo_epi16(shifted2, shifted3);
+ const __m128i transpose0_2 = _mm_unpackhi_epi16(shifted0, shifted1);
+ const __m128i transpose0_3 = _mm_unpackhi_epi16(shifted2, shifted3);
+ // a00 a10 a01 a11 a02 a12 a03 a13
+ // a20 a30 a21 a31 a22 a32 a23 a33
+ // b00 b10 b01 b11 b02 b12 b03 b13
+ // b20 b30 b21 b31 b22 b32 b23 b33
+ const __m128i transpose1_0 = _mm_unpacklo_epi32(transpose0_0, transpose0_1);
+ const __m128i transpose1_1 = _mm_unpacklo_epi32(transpose0_2, transpose0_3);
+ const __m128i transpose1_2 = _mm_unpackhi_epi32(transpose0_0, transpose0_1);
+ const __m128i transpose1_3 = _mm_unpackhi_epi32(transpose0_2, transpose0_3);
+ // a00 a10 a20 a30 a01 a11 a21 a31
+ // b00 b10 b20 b30 b01 b11 b21 b31
+ // a02 a12 a22 a32 a03 a13 a23 a33
+ // b02 b12 a22 b32 b03 b13 b23 b33
+ T0 = _mm_unpacklo_epi64(transpose1_0, transpose1_1);
+ T1 = _mm_unpackhi_epi64(transpose1_0, transpose1_1);
+ T2 = _mm_unpacklo_epi64(transpose1_2, transpose1_3);
+ T3 = _mm_unpackhi_epi64(transpose1_2, transpose1_3);
+ // a00 a10 a20 a30 b00 b10 b20 b30
+ // a01 a11 a21 a31 b01 b11 b21 b31
+ // a02 a12 a22 a32 b02 b12 b22 b32
+ // a03 a13 a23 a33 b03 b13 b23 b33
+ }
+
+ // Add inverse transform to 'ref' and store.
+ {
+ const __m128i zero = _mm_setzero_si128();
+ // Load the reference(s).
+ __m128i ref0, ref1, ref2, ref3;
+ if (do_two) {
+ // Load eight bytes/pixels per line.
+ ref0 = _mm_loadl_epi64((__m128i*)&ref[0 * BPS]);
+ ref1 = _mm_loadl_epi64((__m128i*)&ref[1 * BPS]);
+ ref2 = _mm_loadl_epi64((__m128i*)&ref[2 * BPS]);
+ ref3 = _mm_loadl_epi64((__m128i*)&ref[3 * BPS]);
+ } else {
+ // Load four bytes/pixels per line.
+ ref0 = _mm_cvtsi32_si128(*(int*)&ref[0 * BPS]);
+ ref1 = _mm_cvtsi32_si128(*(int*)&ref[1 * BPS]);
+ ref2 = _mm_cvtsi32_si128(*(int*)&ref[2 * BPS]);
+ ref3 = _mm_cvtsi32_si128(*(int*)&ref[3 * BPS]);
+ }
+ // Convert to 16b.
+ ref0 = _mm_unpacklo_epi8(ref0, zero);
+ ref1 = _mm_unpacklo_epi8(ref1, zero);
+ ref2 = _mm_unpacklo_epi8(ref2, zero);
+ ref3 = _mm_unpacklo_epi8(ref3, zero);
+ // Add the inverse transform(s).
+ ref0 = _mm_add_epi16(ref0, T0);
+ ref1 = _mm_add_epi16(ref1, T1);
+ ref2 = _mm_add_epi16(ref2, T2);
+ ref3 = _mm_add_epi16(ref3, T3);
+ // Unsigned saturate to 8b.
+ ref0 = _mm_packus_epi16(ref0, ref0);
+ ref1 = _mm_packus_epi16(ref1, ref1);
+ ref2 = _mm_packus_epi16(ref2, ref2);
+ ref3 = _mm_packus_epi16(ref3, ref3);
+ // Store the results.
+ if (do_two) {
+ // Store eight bytes/pixels per line.
+ _mm_storel_epi64((__m128i*)&dst[0 * BPS], ref0);
+ _mm_storel_epi64((__m128i*)&dst[1 * BPS], ref1);
+ _mm_storel_epi64((__m128i*)&dst[2 * BPS], ref2);
+ _mm_storel_epi64((__m128i*)&dst[3 * BPS], ref3);
+ } else {
+ // Store four bytes/pixels per line.
+ *((int32_t *)&dst[0 * BPS]) = _mm_cvtsi128_si32(ref0);
+ *((int32_t *)&dst[1 * BPS]) = _mm_cvtsi128_si32(ref1);
+ *((int32_t *)&dst[2 * BPS]) = _mm_cvtsi128_si32(ref2);
+ *((int32_t *)&dst[3 * BPS]) = _mm_cvtsi128_si32(ref3);
+ }
+ }
+}
+
+static void FTransform(const uint8_t* src, const uint8_t* ref, int16_t* out) {
+ const __m128i zero = _mm_setzero_si128();
+ const __m128i seven = _mm_set1_epi16(7);
+ const __m128i k937 = _mm_set1_epi32(937);
+ const __m128i k1812 = _mm_set1_epi32(1812);
+ const __m128i k51000 = _mm_set1_epi32(51000);
+ const __m128i k12000_plus_one = _mm_set1_epi32(12000 + (1 << 16));
+ const __m128i k5352_2217 = _mm_set_epi16(5352, 2217, 5352, 2217,
+ 5352, 2217, 5352, 2217);
+ const __m128i k2217_5352 = _mm_set_epi16(2217, -5352, 2217, -5352,
+ 2217, -5352, 2217, -5352);
+ const __m128i k88p = _mm_set_epi16(8, 8, 8, 8, 8, 8, 8, 8);
+ const __m128i k88m = _mm_set_epi16(-8, 8, -8, 8, -8, 8, -8, 8);
+ const __m128i k5352_2217p = _mm_set_epi16(2217, 5352, 2217, 5352,
+ 2217, 5352, 2217, 5352);
+ const __m128i k5352_2217m = _mm_set_epi16(-5352, 2217, -5352, 2217,
+ -5352, 2217, -5352, 2217);
+ __m128i v01, v32;
+
+
+ // Difference between src and ref and initial transpose.
+ {
+ // Load src and convert to 16b.
+ const __m128i src0 = _mm_loadl_epi64((__m128i*)&src[0 * BPS]);
+ const __m128i src1 = _mm_loadl_epi64((__m128i*)&src[1 * BPS]);
+ const __m128i src2 = _mm_loadl_epi64((__m128i*)&src[2 * BPS]);
+ const __m128i src3 = _mm_loadl_epi64((__m128i*)&src[3 * BPS]);
+ const __m128i src_0 = _mm_unpacklo_epi8(src0, zero);
+ const __m128i src_1 = _mm_unpacklo_epi8(src1, zero);
+ const __m128i src_2 = _mm_unpacklo_epi8(src2, zero);
+ const __m128i src_3 = _mm_unpacklo_epi8(src3, zero);
+ // Load ref and convert to 16b.
+ const __m128i ref0 = _mm_loadl_epi64((__m128i*)&ref[0 * BPS]);
+ const __m128i ref1 = _mm_loadl_epi64((__m128i*)&ref[1 * BPS]);
+ const __m128i ref2 = _mm_loadl_epi64((__m128i*)&ref[2 * BPS]);
+ const __m128i ref3 = _mm_loadl_epi64((__m128i*)&ref[3 * BPS]);
+ const __m128i ref_0 = _mm_unpacklo_epi8(ref0, zero);
+ const __m128i ref_1 = _mm_unpacklo_epi8(ref1, zero);
+ const __m128i ref_2 = _mm_unpacklo_epi8(ref2, zero);
+ const __m128i ref_3 = _mm_unpacklo_epi8(ref3, zero);
+ // Compute difference. -> 00 01 02 03 00 00 00 00
+ const __m128i diff0 = _mm_sub_epi16(src_0, ref_0);
+ const __m128i diff1 = _mm_sub_epi16(src_1, ref_1);
+ const __m128i diff2 = _mm_sub_epi16(src_2, ref_2);
+ const __m128i diff3 = _mm_sub_epi16(src_3, ref_3);
+
+
+ // Unpack and shuffle
+ // 00 01 02 03 0 0 0 0
+ // 10 11 12 13 0 0 0 0
+ // 20 21 22 23 0 0 0 0
+ // 30 31 32 33 0 0 0 0
+ const __m128i shuf01 = _mm_unpacklo_epi32(diff0, diff1);
+ const __m128i shuf23 = _mm_unpacklo_epi32(diff2, diff3);
+ // 00 01 10 11 02 03 12 13
+ // 20 21 30 31 22 23 32 33
+ const __m128i shuf01_p =
+ _mm_shufflehi_epi16(shuf01, _MM_SHUFFLE(2, 3, 0, 1));
+ const __m128i shuf23_p =
+ _mm_shufflehi_epi16(shuf23, _MM_SHUFFLE(2, 3, 0, 1));
+ // 00 01 10 11 03 02 13 12
+ // 20 21 30 31 23 22 33 32
+ const __m128i s01 = _mm_unpacklo_epi64(shuf01_p, shuf23_p);
+ const __m128i s32 = _mm_unpackhi_epi64(shuf01_p, shuf23_p);
+ // 00 01 10 11 20 21 30 31
+ // 03 02 13 12 23 22 33 32
+ const __m128i a01 = _mm_add_epi16(s01, s32);
+ const __m128i a32 = _mm_sub_epi16(s01, s32);
+ // [d0 + d3 | d1 + d2 | ...] = [a0 a1 | a0' a1' | ... ]
+ // [d0 - d3 | d1 - d2 | ...] = [a3 a2 | a3' a2' | ... ]
+
+ const __m128i tmp0 = _mm_madd_epi16(a01, k88p); // [ (a0 + a1) << 3, ... ]
+ const __m128i tmp2 = _mm_madd_epi16(a01, k88m); // [ (a0 - a1) << 3, ... ]
+ const __m128i tmp1_1 = _mm_madd_epi16(a32, k5352_2217p);
+ const __m128i tmp3_1 = _mm_madd_epi16(a32, k5352_2217m);
+ const __m128i tmp1_2 = _mm_add_epi32(tmp1_1, k1812);
+ const __m128i tmp3_2 = _mm_add_epi32(tmp3_1, k937);
+ const __m128i tmp1 = _mm_srai_epi32(tmp1_2, 9);
+ const __m128i tmp3 = _mm_srai_epi32(tmp3_2, 9);
+ const __m128i s03 = _mm_packs_epi32(tmp0, tmp2);
+ const __m128i s12 = _mm_packs_epi32(tmp1, tmp3);
+ const __m128i s_lo = _mm_unpacklo_epi16(s03, s12); // 0 1 0 1 0 1...
+ const __m128i s_hi = _mm_unpackhi_epi16(s03, s12); // 2 3 2 3 2 3
+ const __m128i v23 = _mm_unpackhi_epi32(s_lo, s_hi);
+ v01 = _mm_unpacklo_epi32(s_lo, s_hi);
+ v32 = _mm_shuffle_epi32(v23, _MM_SHUFFLE(1, 0, 3, 2)); // 3 2 3 2 3 2..
+ }
+
+ // Second pass
+ {
+ // Same operations are done on the (0,3) and (1,2) pairs.
+ // a0 = v0 + v3
+ // a1 = v1 + v2
+ // a3 = v0 - v3
+ // a2 = v1 - v2
+ const __m128i a01 = _mm_add_epi16(v01, v32);
+ const __m128i a32 = _mm_sub_epi16(v01, v32);
+ const __m128i a11 = _mm_unpackhi_epi64(a01, a01);
+ const __m128i a22 = _mm_unpackhi_epi64(a32, a32);
+ const __m128i a01_plus_7 = _mm_add_epi16(a01, seven);
+
+ // d0 = (a0 + a1 + 7) >> 4;
+ // d2 = (a0 - a1 + 7) >> 4;
+ const __m128i c0 = _mm_add_epi16(a01_plus_7, a11);
+ const __m128i c2 = _mm_sub_epi16(a01_plus_7, a11);
+ const __m128i d0 = _mm_srai_epi16(c0, 4);
+ const __m128i d2 = _mm_srai_epi16(c2, 4);
+
+ // f1 = ((b3 * 5352 + b2 * 2217 + 12000) >> 16)
+ // f3 = ((b3 * 2217 - b2 * 5352 + 51000) >> 16)
+ const __m128i b23 = _mm_unpacklo_epi16(a22, a32);
+ const __m128i c1 = _mm_madd_epi16(b23, k5352_2217);
+ const __m128i c3 = _mm_madd_epi16(b23, k2217_5352);
+ const __m128i d1 = _mm_add_epi32(c1, k12000_plus_one);
+ const __m128i d3 = _mm_add_epi32(c3, k51000);
+ const __m128i e1 = _mm_srai_epi32(d1, 16);
+ const __m128i e3 = _mm_srai_epi32(d3, 16);
+ const __m128i f1 = _mm_packs_epi32(e1, e1);
+ const __m128i f3 = _mm_packs_epi32(e3, e3);
+ // f1 = f1 + (a3 != 0);
+ // The compare will return (0xffff, 0) for (==0, !=0). To turn that into the
+ // desired (0, 1), we add one earlier through k12000_plus_one.
+ // -> f1 = f1 + 1 - (a3 == 0)
+ const __m128i g1 = _mm_add_epi16(f1, _mm_cmpeq_epi16(a32, zero));
+
+ const __m128i d0_g1 = _mm_unpacklo_epi64(d0, g1);
+ const __m128i d2_f3 = _mm_unpacklo_epi64(d2, f3);
+ _mm_storeu_si128((__m128i*)&out[0], d0_g1);
+ _mm_storeu_si128((__m128i*)&out[8], d2_f3);
+ }
+}
+
+static void FTransformWHT(const int16_t* in, int16_t* out) {
+ int32_t tmp[16];
+ int i;
+ for (i = 0; i < 4; ++i, in += 64) {
+ const int a0 = (in[0 * 16] + in[2 * 16]);
+ const int a1 = (in[1 * 16] + in[3 * 16]);
+ const int a2 = (in[1 * 16] - in[3 * 16]);
+ const int a3 = (in[0 * 16] - in[2 * 16]);
+ tmp[0 + i * 4] = a0 + a1;
+ tmp[1 + i * 4] = a3 + a2;
+ tmp[2 + i * 4] = a3 - a2;
+ tmp[3 + i * 4] = a0 - a1;
+ }
+ {
+ const __m128i src0 = _mm_loadu_si128((__m128i*)&tmp[0]);
+ const __m128i src1 = _mm_loadu_si128((__m128i*)&tmp[4]);
+ const __m128i src2 = _mm_loadu_si128((__m128i*)&tmp[8]);
+ const __m128i src3 = _mm_loadu_si128((__m128i*)&tmp[12]);
+ const __m128i a0 = _mm_add_epi32(src0, src2);
+ const __m128i a1 = _mm_add_epi32(src1, src3);
+ const __m128i a2 = _mm_sub_epi32(src1, src3);
+ const __m128i a3 = _mm_sub_epi32(src0, src2);
+ const __m128i b0 = _mm_srai_epi32(_mm_add_epi32(a0, a1), 1);
+ const __m128i b1 = _mm_srai_epi32(_mm_add_epi32(a3, a2), 1);
+ const __m128i b2 = _mm_srai_epi32(_mm_sub_epi32(a3, a2), 1);
+ const __m128i b3 = _mm_srai_epi32(_mm_sub_epi32(a0, a1), 1);
+ const __m128i out0 = _mm_packs_epi32(b0, b1);
+ const __m128i out1 = _mm_packs_epi32(b2, b3);
+ _mm_storeu_si128((__m128i*)&out[0], out0);
+ _mm_storeu_si128((__m128i*)&out[8], out1);
+ }
+}
+
+//------------------------------------------------------------------------------
+// Metric
+
+static int SSE_Nx4(const uint8_t* a, const uint8_t* b,
+ int num_quads, int do_16) {
+ const __m128i zero = _mm_setzero_si128();
+ __m128i sum1 = zero;
+ __m128i sum2 = zero;
+
+ while (num_quads-- > 0) {
+ // Note: for the !do_16 case, we read 16 pixels instead of 8 but that's ok,
+ // thanks to buffer over-allocation to that effect.
+ const __m128i a0 = _mm_loadu_si128((__m128i*)&a[BPS * 0]);
+ const __m128i a1 = _mm_loadu_si128((__m128i*)&a[BPS * 1]);
+ const __m128i a2 = _mm_loadu_si128((__m128i*)&a[BPS * 2]);
+ const __m128i a3 = _mm_loadu_si128((__m128i*)&a[BPS * 3]);
+ const __m128i b0 = _mm_loadu_si128((__m128i*)&b[BPS * 0]);
+ const __m128i b1 = _mm_loadu_si128((__m128i*)&b[BPS * 1]);
+ const __m128i b2 = _mm_loadu_si128((__m128i*)&b[BPS * 2]);
+ const __m128i b3 = _mm_loadu_si128((__m128i*)&b[BPS * 3]);
+
+ // compute clip0(a-b) and clip0(b-a)
+ const __m128i a0p = _mm_subs_epu8(a0, b0);
+ const __m128i a0m = _mm_subs_epu8(b0, a0);
+ const __m128i a1p = _mm_subs_epu8(a1, b1);
+ const __m128i a1m = _mm_subs_epu8(b1, a1);
+ const __m128i a2p = _mm_subs_epu8(a2, b2);
+ const __m128i a2m = _mm_subs_epu8(b2, a2);
+ const __m128i a3p = _mm_subs_epu8(a3, b3);
+ const __m128i a3m = _mm_subs_epu8(b3, a3);
+
+ // compute |a-b| with 8b arithmetic as clip0(a-b) | clip0(b-a)
+ const __m128i diff0 = _mm_or_si128(a0p, a0m);
+ const __m128i diff1 = _mm_or_si128(a1p, a1m);
+ const __m128i diff2 = _mm_or_si128(a2p, a2m);
+ const __m128i diff3 = _mm_or_si128(a3p, a3m);
+
+ // unpack (only four operations, instead of eight)
+ const __m128i low0 = _mm_unpacklo_epi8(diff0, zero);
+ const __m128i low1 = _mm_unpacklo_epi8(diff1, zero);
+ const __m128i low2 = _mm_unpacklo_epi8(diff2, zero);
+ const __m128i low3 = _mm_unpacklo_epi8(diff3, zero);
+
+ // multiply with self
+ const __m128i low_madd0 = _mm_madd_epi16(low0, low0);
+ const __m128i low_madd1 = _mm_madd_epi16(low1, low1);
+ const __m128i low_madd2 = _mm_madd_epi16(low2, low2);
+ const __m128i low_madd3 = _mm_madd_epi16(low3, low3);
+
+ // collect in a cascading way
+ const __m128i low_sum0 = _mm_add_epi32(low_madd0, low_madd1);
+ const __m128i low_sum1 = _mm_add_epi32(low_madd2, low_madd3);
+ sum1 = _mm_add_epi32(sum1, low_sum0);
+ sum2 = _mm_add_epi32(sum2, low_sum1);
+
+ if (do_16) { // if necessary, process the higher 8 bytes similarly
+ const __m128i hi0 = _mm_unpackhi_epi8(diff0, zero);
+ const __m128i hi1 = _mm_unpackhi_epi8(diff1, zero);
+ const __m128i hi2 = _mm_unpackhi_epi8(diff2, zero);
+ const __m128i hi3 = _mm_unpackhi_epi8(diff3, zero);
+
+ const __m128i hi_madd0 = _mm_madd_epi16(hi0, hi0);
+ const __m128i hi_madd1 = _mm_madd_epi16(hi1, hi1);
+ const __m128i hi_madd2 = _mm_madd_epi16(hi2, hi2);
+ const __m128i hi_madd3 = _mm_madd_epi16(hi3, hi3);
+ const __m128i hi_sum0 = _mm_add_epi32(hi_madd0, hi_madd1);
+ const __m128i hi_sum1 = _mm_add_epi32(hi_madd2, hi_madd3);
+ sum1 = _mm_add_epi32(sum1, hi_sum0);
+ sum2 = _mm_add_epi32(sum2, hi_sum1);
+ }
+ a += 4 * BPS;
+ b += 4 * BPS;
+ }
+ {
+ int32_t tmp[4];
+ const __m128i sum = _mm_add_epi32(sum1, sum2);
+ _mm_storeu_si128((__m128i*)tmp, sum);
+ return (tmp[3] + tmp[2] + tmp[1] + tmp[0]);
+ }
+}
+
+static int SSE16x16(const uint8_t* a, const uint8_t* b) {
+ return SSE_Nx4(a, b, 4, 1);
+}
+
+static int SSE16x8(const uint8_t* a, const uint8_t* b) {
+ return SSE_Nx4(a, b, 2, 1);
+}
+
+static int SSE8x8(const uint8_t* a, const uint8_t* b) {
+ return SSE_Nx4(a, b, 2, 0);
+}
+
+static int SSE4x4(const uint8_t* a, const uint8_t* b) {
+ const __m128i zero = _mm_setzero_si128();
+
+ // Load values. Note that we read 8 pixels instead of 4,
+ // but the a/b buffers are over-allocated to that effect.
+ const __m128i a0 = _mm_loadl_epi64((__m128i*)&a[BPS * 0]);
+ const __m128i a1 = _mm_loadl_epi64((__m128i*)&a[BPS * 1]);
+ const __m128i a2 = _mm_loadl_epi64((__m128i*)&a[BPS * 2]);
+ const __m128i a3 = _mm_loadl_epi64((__m128i*)&a[BPS * 3]);
+ const __m128i b0 = _mm_loadl_epi64((__m128i*)&b[BPS * 0]);
+ const __m128i b1 = _mm_loadl_epi64((__m128i*)&b[BPS * 1]);
+ const __m128i b2 = _mm_loadl_epi64((__m128i*)&b[BPS * 2]);
+ const __m128i b3 = _mm_loadl_epi64((__m128i*)&b[BPS * 3]);
+
+ // Combine pair of lines and convert to 16b.
+ const __m128i a01 = _mm_unpacklo_epi32(a0, a1);
+ const __m128i a23 = _mm_unpacklo_epi32(a2, a3);
+ const __m128i b01 = _mm_unpacklo_epi32(b0, b1);
+ const __m128i b23 = _mm_unpacklo_epi32(b2, b3);
+ const __m128i a01s = _mm_unpacklo_epi8(a01, zero);
+ const __m128i a23s = _mm_unpacklo_epi8(a23, zero);
+ const __m128i b01s = _mm_unpacklo_epi8(b01, zero);
+ const __m128i b23s = _mm_unpacklo_epi8(b23, zero);
+
+ // Compute differences; (a-b)^2 = (abs(a-b))^2 = (sat8(a-b) + sat8(b-a))^2
+ // TODO(cduvivier): Dissassemble and figure out why this is fastest. We don't
+ // need absolute values, there is no need to do calculation
+ // in 8bit as we are already in 16bit, ... Yet this is what
+ // benchmarks the fastest!
+ const __m128i d0 = _mm_subs_epu8(a01s, b01s);
+ const __m128i d1 = _mm_subs_epu8(b01s, a01s);
+ const __m128i d2 = _mm_subs_epu8(a23s, b23s);
+ const __m128i d3 = _mm_subs_epu8(b23s, a23s);
+
+ // Square and add them all together.
+ const __m128i madd0 = _mm_madd_epi16(d0, d0);
+ const __m128i madd1 = _mm_madd_epi16(d1, d1);
+ const __m128i madd2 = _mm_madd_epi16(d2, d2);
+ const __m128i madd3 = _mm_madd_epi16(d3, d3);
+ const __m128i sum0 = _mm_add_epi32(madd0, madd1);
+ const __m128i sum1 = _mm_add_epi32(madd2, madd3);
+ const __m128i sum2 = _mm_add_epi32(sum0, sum1);
+
+ int32_t tmp[4];
+ _mm_storeu_si128((__m128i*)tmp, sum2);
+ return (tmp[3] + tmp[2] + tmp[1] + tmp[0]);
+}
+
+//------------------------------------------------------------------------------
+// Texture distortion
+//
+// We try to match the spectral content (weighted) between source and
+// reconstructed samples.
+
+// Hadamard transform
+// Returns the difference between the weighted sum of the absolute value of
+// transformed coefficients.
+static int TTransform(const uint8_t* inA, const uint8_t* inB,
+ const uint16_t* const w) {
+ int32_t sum[4];
+ __m128i tmp_0, tmp_1, tmp_2, tmp_3;
+ const __m128i zero = _mm_setzero_si128();
+
+ // Load, combine and transpose inputs.
+ {
+ const __m128i inA_0 = _mm_loadl_epi64((__m128i*)&inA[BPS * 0]);
+ const __m128i inA_1 = _mm_loadl_epi64((__m128i*)&inA[BPS * 1]);
+ const __m128i inA_2 = _mm_loadl_epi64((__m128i*)&inA[BPS * 2]);
+ const __m128i inA_3 = _mm_loadl_epi64((__m128i*)&inA[BPS * 3]);
+ const __m128i inB_0 = _mm_loadl_epi64((__m128i*)&inB[BPS * 0]);
+ const __m128i inB_1 = _mm_loadl_epi64((__m128i*)&inB[BPS * 1]);
+ const __m128i inB_2 = _mm_loadl_epi64((__m128i*)&inB[BPS * 2]);
+ const __m128i inB_3 = _mm_loadl_epi64((__m128i*)&inB[BPS * 3]);
+
+ // Combine inA and inB (we'll do two transforms in parallel).
+ const __m128i inAB_0 = _mm_unpacklo_epi8(inA_0, inB_0);
+ const __m128i inAB_1 = _mm_unpacklo_epi8(inA_1, inB_1);
+ const __m128i inAB_2 = _mm_unpacklo_epi8(inA_2, inB_2);
+ const __m128i inAB_3 = _mm_unpacklo_epi8(inA_3, inB_3);
+ // a00 b00 a01 b01 a02 b03 a03 b03 0 0 0 0 0 0 0 0
+ // a10 b10 a11 b11 a12 b12 a13 b13 0 0 0 0 0 0 0 0
+ // a20 b20 a21 b21 a22 b22 a23 b23 0 0 0 0 0 0 0 0
+ // a30 b30 a31 b31 a32 b32 a33 b33 0 0 0 0 0 0 0 0
+
+ // Transpose the two 4x4, discarding the filling zeroes.
+ const __m128i transpose0_0 = _mm_unpacklo_epi8(inAB_0, inAB_2);
+ const __m128i transpose0_1 = _mm_unpacklo_epi8(inAB_1, inAB_3);
+ // a00 a20 b00 b20 a01 a21 b01 b21 a02 a22 b02 b22 a03 a23 b03 b23
+ // a10 a30 b10 b30 a11 a31 b11 b31 a12 a32 b12 b32 a13 a33 b13 b33
+ const __m128i transpose1_0 = _mm_unpacklo_epi8(transpose0_0, transpose0_1);
+ const __m128i transpose1_1 = _mm_unpackhi_epi8(transpose0_0, transpose0_1);
+ // a00 a10 a20 a30 b00 b10 b20 b30 a01 a11 a21 a31 b01 b11 b21 b31
+ // a02 a12 a22 a32 b02 b12 b22 b32 a03 a13 a23 a33 b03 b13 b23 b33
+
+ // Convert to 16b.
+ tmp_0 = _mm_unpacklo_epi8(transpose1_0, zero);
+ tmp_1 = _mm_unpackhi_epi8(transpose1_0, zero);
+ tmp_2 = _mm_unpacklo_epi8(transpose1_1, zero);
+ tmp_3 = _mm_unpackhi_epi8(transpose1_1, zero);
+ // a00 a10 a20 a30 b00 b10 b20 b30
+ // a01 a11 a21 a31 b01 b11 b21 b31
+ // a02 a12 a22 a32 b02 b12 b22 b32
+ // a03 a13 a23 a33 b03 b13 b23 b33
+ }
+
+ // Horizontal pass and subsequent transpose.
+ {
+ // Calculate a and b (two 4x4 at once).
+ const __m128i a0 = _mm_add_epi16(tmp_0, tmp_2);
+ const __m128i a1 = _mm_add_epi16(tmp_1, tmp_3);
+ const __m128i a2 = _mm_sub_epi16(tmp_1, tmp_3);
+ const __m128i a3 = _mm_sub_epi16(tmp_0, tmp_2);
+ const __m128i b0 = _mm_add_epi16(a0, a1);
+ const __m128i b1 = _mm_add_epi16(a3, a2);
+ const __m128i b2 = _mm_sub_epi16(a3, a2);
+ const __m128i b3 = _mm_sub_epi16(a0, a1);
+ // a00 a01 a02 a03 b00 b01 b02 b03
+ // a10 a11 a12 a13 b10 b11 b12 b13
+ // a20 a21 a22 a23 b20 b21 b22 b23
+ // a30 a31 a32 a33 b30 b31 b32 b33
+
+ // Transpose the two 4x4.
+ const __m128i transpose0_0 = _mm_unpacklo_epi16(b0, b1);
+ const __m128i transpose0_1 = _mm_unpacklo_epi16(b2, b3);
+ const __m128i transpose0_2 = _mm_unpackhi_epi16(b0, b1);
+ const __m128i transpose0_3 = _mm_unpackhi_epi16(b2, b3);
+ // a00 a10 a01 a11 a02 a12 a03 a13
+ // a20 a30 a21 a31 a22 a32 a23 a33
+ // b00 b10 b01 b11 b02 b12 b03 b13
+ // b20 b30 b21 b31 b22 b32 b23 b33
+ const __m128i transpose1_0 = _mm_unpacklo_epi32(transpose0_0, transpose0_1);
+ const __m128i transpose1_1 = _mm_unpacklo_epi32(transpose0_2, transpose0_3);
+ const __m128i transpose1_2 = _mm_unpackhi_epi32(transpose0_0, transpose0_1);
+ const __m128i transpose1_3 = _mm_unpackhi_epi32(transpose0_2, transpose0_3);
+ // a00 a10 a20 a30 a01 a11 a21 a31
+ // b00 b10 b20 b30 b01 b11 b21 b31
+ // a02 a12 a22 a32 a03 a13 a23 a33
+ // b02 b12 a22 b32 b03 b13 b23 b33
+ tmp_0 = _mm_unpacklo_epi64(transpose1_0, transpose1_1);
+ tmp_1 = _mm_unpackhi_epi64(transpose1_0, transpose1_1);
+ tmp_2 = _mm_unpacklo_epi64(transpose1_2, transpose1_3);
+ tmp_3 = _mm_unpackhi_epi64(transpose1_2, transpose1_3);
+ // a00 a10 a20 a30 b00 b10 b20 b30
+ // a01 a11 a21 a31 b01 b11 b21 b31
+ // a02 a12 a22 a32 b02 b12 b22 b32
+ // a03 a13 a23 a33 b03 b13 b23 b33
+ }
+
+ // Vertical pass and difference of weighted sums.
+ {
+ // Load all inputs.
+ // TODO(cduvivier): Make variable declarations and allocations aligned so
+ // we can use _mm_load_si128 instead of _mm_loadu_si128.
+ const __m128i w_0 = _mm_loadu_si128((__m128i*)&w[0]);
+ const __m128i w_8 = _mm_loadu_si128((__m128i*)&w[8]);
+
+ // Calculate a and b (two 4x4 at once).
+ const __m128i a0 = _mm_add_epi16(tmp_0, tmp_2);
+ const __m128i a1 = _mm_add_epi16(tmp_1, tmp_3);
+ const __m128i a2 = _mm_sub_epi16(tmp_1, tmp_3);
+ const __m128i a3 = _mm_sub_epi16(tmp_0, tmp_2);
+ const __m128i b0 = _mm_add_epi16(a0, a1);
+ const __m128i b1 = _mm_add_epi16(a3, a2);
+ const __m128i b2 = _mm_sub_epi16(a3, a2);
+ const __m128i b3 = _mm_sub_epi16(a0, a1);
+
+ // Separate the transforms of inA and inB.
+ __m128i A_b0 = _mm_unpacklo_epi64(b0, b1);
+ __m128i A_b2 = _mm_unpacklo_epi64(b2, b3);
+ __m128i B_b0 = _mm_unpackhi_epi64(b0, b1);
+ __m128i B_b2 = _mm_unpackhi_epi64(b2, b3);
+
+ {
+ // sign(b) = b >> 15 (0x0000 if positive, 0xffff if negative)
+ const __m128i sign_A_b0 = _mm_srai_epi16(A_b0, 15);
+ const __m128i sign_A_b2 = _mm_srai_epi16(A_b2, 15);
+ const __m128i sign_B_b0 = _mm_srai_epi16(B_b0, 15);
+ const __m128i sign_B_b2 = _mm_srai_epi16(B_b2, 15);
+
+ // b = abs(b) = (b ^ sign) - sign
+ A_b0 = _mm_xor_si128(A_b0, sign_A_b0);
+ A_b2 = _mm_xor_si128(A_b2, sign_A_b2);
+ B_b0 = _mm_xor_si128(B_b0, sign_B_b0);
+ B_b2 = _mm_xor_si128(B_b2, sign_B_b2);
+ A_b0 = _mm_sub_epi16(A_b0, sign_A_b0);
+ A_b2 = _mm_sub_epi16(A_b2, sign_A_b2);
+ B_b0 = _mm_sub_epi16(B_b0, sign_B_b0);
+ B_b2 = _mm_sub_epi16(B_b2, sign_B_b2);
+ }
+
+ // weighted sums
+ A_b0 = _mm_madd_epi16(A_b0, w_0);
+ A_b2 = _mm_madd_epi16(A_b2, w_8);
+ B_b0 = _mm_madd_epi16(B_b0, w_0);
+ B_b2 = _mm_madd_epi16(B_b2, w_8);
+ A_b0 = _mm_add_epi32(A_b0, A_b2);
+ B_b0 = _mm_add_epi32(B_b0, B_b2);
+
+ // difference of weighted sums
+ A_b0 = _mm_sub_epi32(A_b0, B_b0);
+ _mm_storeu_si128((__m128i*)&sum[0], A_b0);
+ }
+ return sum[0] + sum[1] + sum[2] + sum[3];
+}
+
+static int Disto4x4(const uint8_t* const a, const uint8_t* const b,
+ const uint16_t* const w) {
+ const int diff_sum = TTransform(a, b, w);
+ return abs(diff_sum) >> 5;
+}
+
+static int Disto16x16(const uint8_t* const a, const uint8_t* const b,
+ const uint16_t* const w) {
+ int D = 0;
+ int x, y;
+ for (y = 0; y < 16 * BPS; y += 4 * BPS) {
+ for (x = 0; x < 16; x += 4) {
+ D += Disto4x4(a + x + y, b + x + y, w);
+ }
+ }
+ return D;
+}
+
+//------------------------------------------------------------------------------
+// Quantization
+//
+
+static WEBP_INLINE int DoQuantizeBlock(int16_t in[16], int16_t out[16],
+ const uint16_t* const sharpen,
+ const VP8Matrix* const mtx) {
+ const __m128i max_coeff_2047 = _mm_set1_epi16(MAX_LEVEL);
+ const __m128i zero = _mm_setzero_si128();
+ __m128i coeff0, coeff8;
+ __m128i out0, out8;
+ __m128i packed_out;
+
+ // Load all inputs.
+ // TODO(cduvivier): Make variable declarations and allocations aligned so that
+ // we can use _mm_load_si128 instead of _mm_loadu_si128.
+ __m128i in0 = _mm_loadu_si128((__m128i*)&in[0]);
+ __m128i in8 = _mm_loadu_si128((__m128i*)&in[8]);
+ const __m128i iq0 = _mm_loadu_si128((__m128i*)&mtx->iq_[0]);
+ const __m128i iq8 = _mm_loadu_si128((__m128i*)&mtx->iq_[8]);
+ const __m128i q0 = _mm_loadu_si128((__m128i*)&mtx->q_[0]);
+ const __m128i q8 = _mm_loadu_si128((__m128i*)&mtx->q_[8]);
+
+ // extract sign(in) (0x0000 if positive, 0xffff if negative)
+ const __m128i sign0 = _mm_cmpgt_epi16(zero, in0);
+ const __m128i sign8 = _mm_cmpgt_epi16(zero, in8);
+
+ // coeff = abs(in) = (in ^ sign) - sign
+ coeff0 = _mm_xor_si128(in0, sign0);
+ coeff8 = _mm_xor_si128(in8, sign8);
+ coeff0 = _mm_sub_epi16(coeff0, sign0);
+ coeff8 = _mm_sub_epi16(coeff8, sign8);
+
+ // coeff = abs(in) + sharpen
+ if (sharpen != NULL) {
+ const __m128i sharpen0 = _mm_loadu_si128((__m128i*)&sharpen[0]);
+ const __m128i sharpen8 = _mm_loadu_si128((__m128i*)&sharpen[8]);
+ coeff0 = _mm_add_epi16(coeff0, sharpen0);
+ coeff8 = _mm_add_epi16(coeff8, sharpen8);
+ }
+
+ // out = (coeff * iQ + B) >> QFIX
+ {
+ // doing calculations with 32b precision (QFIX=17)
+ // out = (coeff * iQ)
+ const __m128i coeff_iQ0H = _mm_mulhi_epu16(coeff0, iq0);
+ const __m128i coeff_iQ0L = _mm_mullo_epi16(coeff0, iq0);
+ const __m128i coeff_iQ8H = _mm_mulhi_epu16(coeff8, iq8);
+ const __m128i coeff_iQ8L = _mm_mullo_epi16(coeff8, iq8);
+ __m128i out_00 = _mm_unpacklo_epi16(coeff_iQ0L, coeff_iQ0H);
+ __m128i out_04 = _mm_unpackhi_epi16(coeff_iQ0L, coeff_iQ0H);
+ __m128i out_08 = _mm_unpacklo_epi16(coeff_iQ8L, coeff_iQ8H);
+ __m128i out_12 = _mm_unpackhi_epi16(coeff_iQ8L, coeff_iQ8H);
+ // out = (coeff * iQ + B)
+ const __m128i bias_00 = _mm_loadu_si128((__m128i*)&mtx->bias_[0]);
+ const __m128i bias_04 = _mm_loadu_si128((__m128i*)&mtx->bias_[4]);
+ const __m128i bias_08 = _mm_loadu_si128((__m128i*)&mtx->bias_[8]);
+ const __m128i bias_12 = _mm_loadu_si128((__m128i*)&mtx->bias_[12]);
+ out_00 = _mm_add_epi32(out_00, bias_00);
+ out_04 = _mm_add_epi32(out_04, bias_04);
+ out_08 = _mm_add_epi32(out_08, bias_08);
+ out_12 = _mm_add_epi32(out_12, bias_12);
+ // out = QUANTDIV(coeff, iQ, B, QFIX)
+ out_00 = _mm_srai_epi32(out_00, QFIX);
+ out_04 = _mm_srai_epi32(out_04, QFIX);
+ out_08 = _mm_srai_epi32(out_08, QFIX);
+ out_12 = _mm_srai_epi32(out_12, QFIX);
+
+ // pack result as 16b
+ out0 = _mm_packs_epi32(out_00, out_04);
+ out8 = _mm_packs_epi32(out_08, out_12);
+
+ // if (coeff > 2047) coeff = 2047
+ out0 = _mm_min_epi16(out0, max_coeff_2047);
+ out8 = _mm_min_epi16(out8, max_coeff_2047);
+ }
+
+ // get sign back (if (sign[j]) out_n = -out_n)
+ out0 = _mm_xor_si128(out0, sign0);
+ out8 = _mm_xor_si128(out8, sign8);
+ out0 = _mm_sub_epi16(out0, sign0);
+ out8 = _mm_sub_epi16(out8, sign8);
+
+ // in = out * Q
+ in0 = _mm_mullo_epi16(out0, q0);
+ in8 = _mm_mullo_epi16(out8, q8);
+
+ _mm_storeu_si128((__m128i*)&in[0], in0);
+ _mm_storeu_si128((__m128i*)&in[8], in8);
+
+ // zigzag the output before storing it.
+ //
+ // The zigzag pattern can almost be reproduced with a small sequence of
+ // shuffles. After it, we only need to swap the 7th (ending up in third
+ // position instead of twelfth) and 8th values.
+ {
+ __m128i outZ0, outZ8;
+ outZ0 = _mm_shufflehi_epi16(out0, _MM_SHUFFLE(2, 1, 3, 0));
+ outZ0 = _mm_shuffle_epi32 (outZ0, _MM_SHUFFLE(3, 1, 2, 0));
+ outZ0 = _mm_shufflehi_epi16(outZ0, _MM_SHUFFLE(3, 1, 0, 2));
+ outZ8 = _mm_shufflelo_epi16(out8, _MM_SHUFFLE(3, 0, 2, 1));
+ outZ8 = _mm_shuffle_epi32 (outZ8, _MM_SHUFFLE(3, 1, 2, 0));
+ outZ8 = _mm_shufflelo_epi16(outZ8, _MM_SHUFFLE(1, 3, 2, 0));
+ _mm_storeu_si128((__m128i*)&out[0], outZ0);
+ _mm_storeu_si128((__m128i*)&out[8], outZ8);
+ packed_out = _mm_packs_epi16(outZ0, outZ8);
+ }
+ {
+ const int16_t outZ_12 = out[12];
+ const int16_t outZ_3 = out[3];
+ out[3] = outZ_12;
+ out[12] = outZ_3;
+ }
+
+ // detect if all 'out' values are zeroes or not
+ return (_mm_movemask_epi8(_mm_cmpeq_epi8(packed_out, zero)) != 0xffff);
+}
+
+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);
+}
+
+// Forward declaration.
+void VP8SetResidualCoeffsSSE2(const int16_t* const coeffs,
+ VP8Residual* const res);
+
+void VP8SetResidualCoeffsSSE2(const int16_t* const coeffs,
+ VP8Residual* const res) {
+ const __m128i c0 = _mm_loadu_si128((const __m128i*)coeffs);
+ const __m128i c1 = _mm_loadu_si128((const __m128i*)(coeffs + 8));
+ // Use SSE to compare 8 values with a single instruction.
+ const __m128i zero = _mm_setzero_si128();
+ const __m128i m0 = _mm_cmpeq_epi16(c0, zero);
+ const __m128i m1 = _mm_cmpeq_epi16(c1, zero);
+ // Get the comparison results as a bitmask, consisting of two times 16 bits:
+ // two identical bits for each result. Concatenate both bitmasks to get a
+ // single 32 bit value. Negate the mask to get the position of entries that
+ // are not equal to zero. We don't need to mask out least significant bits
+ // according to res->first, since coeffs[0] is 0 if res->first > 0
+ const uint32_t mask =
+ ~(((uint32_t)_mm_movemask_epi8(m1) << 16) | _mm_movemask_epi8(m0));
+ // The position of the most significant non-zero bit indicates the position of
+ // the last non-zero value. Divide the result by two because __movemask_epi8
+ // operates on 8 bit values instead of 16 bit values.
+ assert(res->first == 0 || coeffs[0] == 0);
+ res->last = mask ? (BitsLog2Floor(mask) >> 1) : -1;
+ res->coeffs = coeffs;
+}
+
+#endif // WEBP_USE_SSE2
+
+//------------------------------------------------------------------------------
+// Entry point
+
+extern void VP8EncDspInitSSE2(void);
+
+void VP8EncDspInitSSE2(void) {
+#if defined(WEBP_USE_SSE2)
+ VP8CollectHistogram = CollectHistogram;
+ VP8EncQuantizeBlock = QuantizeBlock;
+ VP8EncQuantizeBlockWHT = QuantizeBlockWHT;
+ VP8ITransform = ITransform;
+ VP8FTransform = FTransform;
+ VP8FTransformWHT = FTransformWHT;
+ VP8SSE16x16 = SSE16x16;
+ VP8SSE16x8 = SSE16x8;
+ VP8SSE8x8 = SSE8x8;
+ VP8SSE4x4 = SSE4x4;
+ VP8TDisto4x4 = Disto4x4;
+ VP8TDisto16x16 = Disto16x16;
+#endif // WEBP_USE_SSE2
+}
+
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