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// Copyright 2015 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 variant of methods for lossless encoder
//
// Author: Skal (pascal.massimino@gmail.com)
#include "src/dsp/dsp.h"
#if defined(WEBP_USE_SSE2)
#include <assert.h>
#include <emmintrin.h>
#include "src/dsp/lossless.h"
#include "src/dsp/common_sse2.h"
#include "src/dsp/lossless_common.h"
// For sign-extended multiplying constants, pre-shifted by 5:
#define CST_5b(X) (((int16_t)((uint16_t)(X) << 8)) >> 5)
//------------------------------------------------------------------------------
// Subtract-Green Transform
static void SubtractGreenFromBlueAndRed_SSE2(uint32_t* argb_data,
int num_pixels) {
int i;
for (i = 0; i + 4 <= num_pixels; i += 4) {
const __m128i in = _mm_loadu_si128((__m128i*)&argb_data[i]); // argb
const __m128i A = _mm_srli_epi16(in, 8); // 0 a 0 g
const __m128i B = _mm_shufflelo_epi16(A, _MM_SHUFFLE(2, 2, 0, 0));
const __m128i C = _mm_shufflehi_epi16(B, _MM_SHUFFLE(2, 2, 0, 0)); // 0g0g
const __m128i out = _mm_sub_epi8(in, C);
_mm_storeu_si128((__m128i*)&argb_data[i], out);
}
// fallthrough and finish off with plain-C
if (i != num_pixels) {
VP8LSubtractGreenFromBlueAndRed_C(argb_data + i, num_pixels - i);
}
}
//------------------------------------------------------------------------------
// Color Transform
#define MK_CST_16(HI, LO) \
_mm_set1_epi32((int)(((uint32_t)(HI) << 16) | ((LO) & 0xffff)))
static void TransformColor_SSE2(const VP8LMultipliers* const m,
uint32_t* argb_data, int num_pixels) {
const __m128i mults_rb = MK_CST_16(CST_5b(m->green_to_red_),
CST_5b(m->green_to_blue_));
const __m128i mults_b2 = MK_CST_16(CST_5b(m->red_to_blue_), 0);
const __m128i mask_ag = _mm_set1_epi32((int)0xff00ff00); // alpha-green masks
const __m128i mask_rb = _mm_set1_epi32(0x00ff00ff); // red-blue masks
int i;
for (i = 0; i + 4 <= num_pixels; i += 4) {
const __m128i in = _mm_loadu_si128((__m128i*)&argb_data[i]); // argb
const __m128i A = _mm_and_si128(in, mask_ag); // a 0 g 0
const __m128i B = _mm_shufflelo_epi16(A, _MM_SHUFFLE(2, 2, 0, 0));
const __m128i C = _mm_shufflehi_epi16(B, _MM_SHUFFLE(2, 2, 0, 0)); // g0g0
const __m128i D = _mm_mulhi_epi16(C, mults_rb); // x dr x db1
const __m128i E = _mm_slli_epi16(in, 8); // r 0 b 0
const __m128i F = _mm_mulhi_epi16(E, mults_b2); // x db2 0 0
const __m128i G = _mm_srli_epi32(F, 16); // 0 0 x db2
const __m128i H = _mm_add_epi8(G, D); // x dr x db
const __m128i I = _mm_and_si128(H, mask_rb); // 0 dr 0 db
const __m128i out = _mm_sub_epi8(in, I);
_mm_storeu_si128((__m128i*)&argb_data[i], out);
}
// fallthrough and finish off with plain-C
if (i != num_pixels) {
VP8LTransformColor_C(m, argb_data + i, num_pixels - i);
}
}
//------------------------------------------------------------------------------
#define SPAN 8
static void CollectColorBlueTransforms_SSE2(const uint32_t* argb, int stride,
int tile_width, int tile_height,
int green_to_blue, int red_to_blue,
int histo[]) {
const __m128i mults_r = MK_CST_16(CST_5b(red_to_blue), 0);
const __m128i mults_g = MK_CST_16(0, CST_5b(green_to_blue));
const __m128i mask_g = _mm_set1_epi32(0x00ff00); // green mask
const __m128i mask_b = _mm_set1_epi32(0x0000ff); // blue mask
int y;
for (y = 0; y < tile_height; ++y) {
const uint32_t* const src = argb + y * stride;
int i, x;
for (x = 0; x + SPAN <= tile_width; x += SPAN) {
uint16_t values[SPAN];
const __m128i in0 = _mm_loadu_si128((__m128i*)&src[x + 0]);
const __m128i in1 = _mm_loadu_si128((__m128i*)&src[x + SPAN / 2]);
const __m128i A0 = _mm_slli_epi16(in0, 8); // r 0 | b 0
const __m128i A1 = _mm_slli_epi16(in1, 8);
const __m128i B0 = _mm_and_si128(in0, mask_g); // 0 0 | g 0
const __m128i B1 = _mm_and_si128(in1, mask_g);
const __m128i C0 = _mm_mulhi_epi16(A0, mults_r); // x db | 0 0
const __m128i C1 = _mm_mulhi_epi16(A1, mults_r);
const __m128i D0 = _mm_mulhi_epi16(B0, mults_g); // 0 0 | x db
const __m128i D1 = _mm_mulhi_epi16(B1, mults_g);
const __m128i E0 = _mm_sub_epi8(in0, D0); // x x | x b'
const __m128i E1 = _mm_sub_epi8(in1, D1);
const __m128i F0 = _mm_srli_epi32(C0, 16); // 0 0 | x db
const __m128i F1 = _mm_srli_epi32(C1, 16);
const __m128i G0 = _mm_sub_epi8(E0, F0); // 0 0 | x b'
const __m128i G1 = _mm_sub_epi8(E1, F1);
const __m128i H0 = _mm_and_si128(G0, mask_b); // 0 0 | 0 b
const __m128i H1 = _mm_and_si128(G1, mask_b);
const __m128i I = _mm_packs_epi32(H0, H1); // 0 b' | 0 b'
_mm_storeu_si128((__m128i*)values, I);
for (i = 0; i < SPAN; ++i) ++histo[values[i]];
}
}
{
const int left_over = tile_width & (SPAN - 1);
if (left_over > 0) {
VP8LCollectColorBlueTransforms_C(argb + tile_width - left_over, stride,
left_over, tile_height,
green_to_blue, red_to_blue, histo);
}
}
}
static void CollectColorRedTransforms_SSE2(const uint32_t* argb, int stride,
int tile_width, int tile_height,
int green_to_red, int histo[]) {
const __m128i mults_g = MK_CST_16(0, CST_5b(green_to_red));
const __m128i mask_g = _mm_set1_epi32(0x00ff00); // green mask
const __m128i mask = _mm_set1_epi32(0xff);
int y;
for (y = 0; y < tile_height; ++y) {
const uint32_t* const src = argb + y * stride;
int i, x;
for (x = 0; x + SPAN <= tile_width; x += SPAN) {
uint16_t values[SPAN];
const __m128i in0 = _mm_loadu_si128((__m128i*)&src[x + 0]);
const __m128i in1 = _mm_loadu_si128((__m128i*)&src[x + SPAN / 2]);
const __m128i A0 = _mm_and_si128(in0, mask_g); // 0 0 | g 0
const __m128i A1 = _mm_and_si128(in1, mask_g);
const __m128i B0 = _mm_srli_epi32(in0, 16); // 0 0 | x r
const __m128i B1 = _mm_srli_epi32(in1, 16);
const __m128i C0 = _mm_mulhi_epi16(A0, mults_g); // 0 0 | x dr
const __m128i C1 = _mm_mulhi_epi16(A1, mults_g);
const __m128i E0 = _mm_sub_epi8(B0, C0); // x x | x r'
const __m128i E1 = _mm_sub_epi8(B1, C1);
const __m128i F0 = _mm_and_si128(E0, mask); // 0 0 | 0 r'
const __m128i F1 = _mm_and_si128(E1, mask);
const __m128i I = _mm_packs_epi32(F0, F1);
_mm_storeu_si128((__m128i*)values, I);
for (i = 0; i < SPAN; ++i) ++histo[values[i]];
}
}
{
const int left_over = tile_width & (SPAN - 1);
if (left_over > 0) {
VP8LCollectColorRedTransforms_C(argb + tile_width - left_over, stride,
left_over, tile_height,
green_to_red, histo);
}
}
}
#undef SPAN
#undef MK_CST_16
//------------------------------------------------------------------------------
// Note we are adding uint32_t's as *signed* int32's (using _mm_add_epi32). But
// that's ok since the histogram values are less than 1<<28 (max picture size).
#define LINE_SIZE 16 // 8 or 16
static void AddVector_SSE2(const uint32_t* a, const uint32_t* b, uint32_t* out,
int size) {
int i;
for (i = 0; i + LINE_SIZE <= size; i += LINE_SIZE) {
const __m128i a0 = _mm_loadu_si128((const __m128i*)&a[i + 0]);
const __m128i a1 = _mm_loadu_si128((const __m128i*)&a[i + 4]);
#if (LINE_SIZE == 16)
const __m128i a2 = _mm_loadu_si128((const __m128i*)&a[i + 8]);
const __m128i a3 = _mm_loadu_si128((const __m128i*)&a[i + 12]);
#endif
const __m128i b0 = _mm_loadu_si128((const __m128i*)&b[i + 0]);
const __m128i b1 = _mm_loadu_si128((const __m128i*)&b[i + 4]);
#if (LINE_SIZE == 16)
const __m128i b2 = _mm_loadu_si128((const __m128i*)&b[i + 8]);
const __m128i b3 = _mm_loadu_si128((const __m128i*)&b[i + 12]);
#endif
_mm_storeu_si128((__m128i*)&out[i + 0], _mm_add_epi32(a0, b0));
_mm_storeu_si128((__m128i*)&out[i + 4], _mm_add_epi32(a1, b1));
#if (LINE_SIZE == 16)
_mm_storeu_si128((__m128i*)&out[i + 8], _mm_add_epi32(a2, b2));
_mm_storeu_si128((__m128i*)&out[i + 12], _mm_add_epi32(a3, b3));
#endif
}
for (; i < size; ++i) {
out[i] = a[i] + b[i];
}
}
static void AddVectorEq_SSE2(const uint32_t* a, uint32_t* out, int size) {
int i;
for (i = 0; i + LINE_SIZE <= size; i += LINE_SIZE) {
const __m128i a0 = _mm_loadu_si128((const __m128i*)&a[i + 0]);
const __m128i a1 = _mm_loadu_si128((const __m128i*)&a[i + 4]);
#if (LINE_SIZE == 16)
const __m128i a2 = _mm_loadu_si128((const __m128i*)&a[i + 8]);
const __m128i a3 = _mm_loadu_si128((const __m128i*)&a[i + 12]);
#endif
const __m128i b0 = _mm_loadu_si128((const __m128i*)&out[i + 0]);
const __m128i b1 = _mm_loadu_si128((const __m128i*)&out[i + 4]);
#if (LINE_SIZE == 16)
const __m128i b2 = _mm_loadu_si128((const __m128i*)&out[i + 8]);
const __m128i b3 = _mm_loadu_si128((const __m128i*)&out[i + 12]);
#endif
_mm_storeu_si128((__m128i*)&out[i + 0], _mm_add_epi32(a0, b0));
_mm_storeu_si128((__m128i*)&out[i + 4], _mm_add_epi32(a1, b1));
#if (LINE_SIZE == 16)
_mm_storeu_si128((__m128i*)&out[i + 8], _mm_add_epi32(a2, b2));
_mm_storeu_si128((__m128i*)&out[i + 12], _mm_add_epi32(a3, b3));
#endif
}
for (; i < size; ++i) {
out[i] += a[i];
}
}
#undef LINE_SIZE
//------------------------------------------------------------------------------
// Entropy
// from the C code due to use of double/float resulting in output differences
// when compared to -noasm.
#if !(defined(WEBP_HAVE_SLOW_CLZ_CTZ) || defined(__i386__) || defined(_M_IX86))
static float CombinedShannonEntropy_SSE2(const int X[256], const int Y[256]) {
int i;
float retval = 0.f;
int sumX = 0, sumXY = 0;
const __m128i zero = _mm_setzero_si128();
for (i = 0; i < 256; i += 16) {
const __m128i x0 = _mm_loadu_si128((const __m128i*)(X + i + 0));
const __m128i y0 = _mm_loadu_si128((const __m128i*)(Y + i + 0));
const __m128i x1 = _mm_loadu_si128((const __m128i*)(X + i + 4));
const __m128i y1 = _mm_loadu_si128((const __m128i*)(Y + i + 4));
const __m128i x2 = _mm_loadu_si128((const __m128i*)(X + i + 8));
const __m128i y2 = _mm_loadu_si128((const __m128i*)(Y + i + 8));
const __m128i x3 = _mm_loadu_si128((const __m128i*)(X + i + 12));
const __m128i y3 = _mm_loadu_si128((const __m128i*)(Y + i + 12));
const __m128i x4 = _mm_packs_epi16(_mm_packs_epi32(x0, x1),
_mm_packs_epi32(x2, x3));
const __m128i y4 = _mm_packs_epi16(_mm_packs_epi32(y0, y1),
_mm_packs_epi32(y2, y3));
const int32_t mx = _mm_movemask_epi8(_mm_cmpgt_epi8(x4, zero));
int32_t my = _mm_movemask_epi8(_mm_cmpgt_epi8(y4, zero)) | mx;
while (my) {
const int32_t j = BitsCtz(my);
int xy;
if ((mx >> j) & 1) {
const int x = X[i + j];
sumXY += x;
retval -= VP8LFastSLog2(x);
}
xy = X[i + j] + Y[i + j];
sumX += xy;
retval -= VP8LFastSLog2(xy);
my &= my - 1;
}
}
retval += VP8LFastSLog2(sumX) + VP8LFastSLog2(sumXY);
return retval;
}
#else
#define DONT_USE_COMBINED_SHANNON_ENTROPY_SSE2_FUNC // won't be faster
#endif
//------------------------------------------------------------------------------
static int VectorMismatch_SSE2(const uint32_t* const array1,
const uint32_t* const array2, int length) {
int match_len;
if (length >= 12) {
__m128i A0 = _mm_loadu_si128((const __m128i*)&array1[0]);
__m128i A1 = _mm_loadu_si128((const __m128i*)&array2[0]);
match_len = 0;
do {
// Loop unrolling and early load both provide a speedup of 10% for the
// current function. Also, max_limit can be MAX_LENGTH=4096 at most.
const __m128i cmpA = _mm_cmpeq_epi32(A0, A1);
const __m128i B0 =
_mm_loadu_si128((const __m128i*)&array1[match_len + 4]);
const __m128i B1 =
_mm_loadu_si128((const __m128i*)&array2[match_len + 4]);
if (_mm_movemask_epi8(cmpA) != 0xffff) break;
match_len += 4;
{
const __m128i cmpB = _mm_cmpeq_epi32(B0, B1);
A0 = _mm_loadu_si128((const __m128i*)&array1[match_len + 4]);
A1 = _mm_loadu_si128((const __m128i*)&array2[match_len + 4]);
if (_mm_movemask_epi8(cmpB) != 0xffff) break;
match_len += 4;
}
} while (match_len + 12 < length);
} else {
match_len = 0;
// Unroll the potential first two loops.
if (length >= 4 &&
_mm_movemask_epi8(_mm_cmpeq_epi32(
_mm_loadu_si128((const __m128i*)&array1[0]),
_mm_loadu_si128((const __m128i*)&array2[0]))) == 0xffff) {
match_len = 4;
if (length >= 8 &&
_mm_movemask_epi8(_mm_cmpeq_epi32(
_mm_loadu_si128((const __m128i*)&array1[4]),
_mm_loadu_si128((const __m128i*)&array2[4]))) == 0xffff) {
match_len = 8;
}
}
}
while (match_len < length && array1[match_len] == array2[match_len]) {
++match_len;
}
return match_len;
}
// Bundles multiple (1, 2, 4 or 8) pixels into a single pixel.
static void BundleColorMap_SSE2(const uint8_t* const row, int width, int xbits,
uint32_t* dst) {
int x;
assert(xbits >= 0);
assert(xbits <= 3);
switch (xbits) {
case 0: {
const __m128i ff = _mm_set1_epi16((short)0xff00);
const __m128i zero = _mm_setzero_si128();
// Store 0xff000000 | (row[x] << 8).
for (x = 0; x + 16 <= width; x += 16, dst += 16) {
const __m128i in = _mm_loadu_si128((const __m128i*)&row[x]);
const __m128i in_lo = _mm_unpacklo_epi8(zero, in);
const __m128i dst0 = _mm_unpacklo_epi16(in_lo, ff);
const __m128i dst1 = _mm_unpackhi_epi16(in_lo, ff);
const __m128i in_hi = _mm_unpackhi_epi8(zero, in);
const __m128i dst2 = _mm_unpacklo_epi16(in_hi, ff);
const __m128i dst3 = _mm_unpackhi_epi16(in_hi, ff);
_mm_storeu_si128((__m128i*)&dst[0], dst0);
_mm_storeu_si128((__m128i*)&dst[4], dst1);
_mm_storeu_si128((__m128i*)&dst[8], dst2);
_mm_storeu_si128((__m128i*)&dst[12], dst3);
}
break;
}
case 1: {
const __m128i ff = _mm_set1_epi16((short)0xff00);
const __m128i mul = _mm_set1_epi16(0x110);
for (x = 0; x + 16 <= width; x += 16, dst += 8) {
// 0a0b | (where a/b are 4 bits).
const __m128i in = _mm_loadu_si128((const __m128i*)&row[x]);
const __m128i tmp = _mm_mullo_epi16(in, mul); // aba0
const __m128i pack = _mm_and_si128(tmp, ff); // ab00
const __m128i dst0 = _mm_unpacklo_epi16(pack, ff);
const __m128i dst1 = _mm_unpackhi_epi16(pack, ff);
_mm_storeu_si128((__m128i*)&dst[0], dst0);
_mm_storeu_si128((__m128i*)&dst[4], dst1);
}
break;
}
case 2: {
const __m128i mask_or = _mm_set1_epi32((int)0xff000000);
const __m128i mul_cst = _mm_set1_epi16(0x0104);
const __m128i mask_mul = _mm_set1_epi16(0x0f00);
for (x = 0; x + 16 <= width; x += 16, dst += 4) {
// 000a000b000c000d | (where a/b/c/d are 2 bits).
const __m128i in = _mm_loadu_si128((const __m128i*)&row[x]);
const __m128i mul = _mm_mullo_epi16(in, mul_cst); // 00ab00b000cd00d0
const __m128i tmp = _mm_and_si128(mul, mask_mul); // 00ab000000cd0000
const __m128i shift = _mm_srli_epi32(tmp, 12); // 00000000ab000000
const __m128i pack = _mm_or_si128(shift, tmp); // 00000000abcd0000
// Convert to 0xff00**00.
const __m128i res = _mm_or_si128(pack, mask_or);
_mm_storeu_si128((__m128i*)dst, res);
}
break;
}
default: {
assert(xbits == 3);
for (x = 0; x + 16 <= width; x += 16, dst += 2) {
// 0000000a00000000b... | (where a/b are 1 bit).
const __m128i in = _mm_loadu_si128((const __m128i*)&row[x]);
const __m128i shift = _mm_slli_epi64(in, 7);
const uint32_t move = _mm_movemask_epi8(shift);
dst[0] = 0xff000000 | ((move & 0xff) << 8);
dst[1] = 0xff000000 | (move & 0xff00);
}
break;
}
}
if (x != width) {
VP8LBundleColorMap_C(row + x, width - x, xbits, dst);
}
}
//------------------------------------------------------------------------------
// Batch version of Predictor Transform subtraction
static WEBP_INLINE void Average2_m128i(const __m128i* const a0,
const __m128i* const a1,
__m128i* const avg) {
// (a + b) >> 1 = ((a + b + 1) >> 1) - ((a ^ b) & 1)
const __m128i ones = _mm_set1_epi8(1);
const __m128i avg1 = _mm_avg_epu8(*a0, *a1);
const __m128i one = _mm_and_si128(_mm_xor_si128(*a0, *a1), ones);
*avg = _mm_sub_epi8(avg1, one);
}
// Predictor0: ARGB_BLACK.
static void PredictorSub0_SSE2(const uint32_t* in, const uint32_t* upper,
int num_pixels, uint32_t* out) {
int i;
const __m128i black = _mm_set1_epi32((int)ARGB_BLACK);
for (i = 0; i + 4 <= num_pixels; i += 4) {
const __m128i src = _mm_loadu_si128((const __m128i*)&in[i]);
const __m128i res = _mm_sub_epi8(src, black);
_mm_storeu_si128((__m128i*)&out[i], res);
}
if (i != num_pixels) {
VP8LPredictorsSub_C[0](in + i, NULL, num_pixels - i, out + i);
}
(void)upper;
}
#define GENERATE_PREDICTOR_1(X, IN) \
static void PredictorSub##X##_SSE2(const uint32_t* const in, \
const uint32_t* const upper, \
int num_pixels, uint32_t* const out) { \
int i; \
for (i = 0; i + 4 <= num_pixels; i += 4) { \
const __m128i src = _mm_loadu_si128((const __m128i*)&in[i]); \
const __m128i pred = _mm_loadu_si128((const __m128i*)&(IN)); \
const __m128i res = _mm_sub_epi8(src, pred); \
_mm_storeu_si128((__m128i*)&out[i], res); \
} \
if (i != num_pixels) { \
VP8LPredictorsSub_C[(X)](in + i, WEBP_OFFSET_PTR(upper, i), \
num_pixels - i, out + i); \
} \
}
GENERATE_PREDICTOR_1(1, in[i - 1]) // Predictor1: L
GENERATE_PREDICTOR_1(2, upper[i]) // Predictor2: T
GENERATE_PREDICTOR_1(3, upper[i + 1]) // Predictor3: TR
GENERATE_PREDICTOR_1(4, upper[i - 1]) // Predictor4: TL
#undef GENERATE_PREDICTOR_1
// Predictor5: avg2(avg2(L, TR), T)
static void PredictorSub5_SSE2(const uint32_t* in, const uint32_t* upper,
int num_pixels, uint32_t* out) {
int i;
for (i = 0; i + 4 <= num_pixels; i += 4) {
const __m128i L = _mm_loadu_si128((const __m128i*)&in[i - 1]);
const __m128i T = _mm_loadu_si128((const __m128i*)&upper[i]);
const __m128i TR = _mm_loadu_si128((const __m128i*)&upper[i + 1]);
const __m128i src = _mm_loadu_si128((const __m128i*)&in[i]);
__m128i avg, pred, res;
Average2_m128i(&L, &TR, &avg);
Average2_m128i(&avg, &T, &pred);
res = _mm_sub_epi8(src, pred);
_mm_storeu_si128((__m128i*)&out[i], res);
}
if (i != num_pixels) {
VP8LPredictorsSub_C[5](in + i, upper + i, num_pixels - i, out + i);
}
}
#define GENERATE_PREDICTOR_2(X, A, B) \
static void PredictorSub##X##_SSE2(const uint32_t* in, const uint32_t* upper, \
int num_pixels, uint32_t* out) { \
int i; \
for (i = 0; i + 4 <= num_pixels; i += 4) { \
const __m128i tA = _mm_loadu_si128((const __m128i*)&(A)); \
const __m128i tB = _mm_loadu_si128((const __m128i*)&(B)); \
const __m128i src = _mm_loadu_si128((const __m128i*)&in[i]); \
__m128i pred, res; \
Average2_m128i(&tA, &tB, &pred); \
res = _mm_sub_epi8(src, pred); \
_mm_storeu_si128((__m128i*)&out[i], res); \
} \
if (i != num_pixels) { \
VP8LPredictorsSub_C[(X)](in + i, upper + i, num_pixels - i, out + i); \
} \
}
GENERATE_PREDICTOR_2(6, in[i - 1], upper[i - 1]) // Predictor6: avg(L, TL)
GENERATE_PREDICTOR_2(7, in[i - 1], upper[i]) // Predictor7: avg(L, T)
GENERATE_PREDICTOR_2(8, upper[i - 1], upper[i]) // Predictor8: avg(TL, T)
GENERATE_PREDICTOR_2(9, upper[i], upper[i + 1]) // Predictor9: average(T, TR)
#undef GENERATE_PREDICTOR_2
// Predictor10: avg(avg(L,TL), avg(T, TR)).
static void PredictorSub10_SSE2(const uint32_t* in, const uint32_t* upper,
int num_pixels, uint32_t* out) {
int i;
for (i = 0; i + 4 <= num_pixels; i += 4) {
const __m128i L = _mm_loadu_si128((const __m128i*)&in[i - 1]);
const __m128i src = _mm_loadu_si128((const __m128i*)&in[i]);
const __m128i TL = _mm_loadu_si128((const __m128i*)&upper[i - 1]);
const __m128i T = _mm_loadu_si128((const __m128i*)&upper[i]);
const __m128i TR = _mm_loadu_si128((const __m128i*)&upper[i + 1]);
__m128i avgTTR, avgLTL, avg, res;
Average2_m128i(&T, &TR, &avgTTR);
Average2_m128i(&L, &TL, &avgLTL);
Average2_m128i(&avgTTR, &avgLTL, &avg);
res = _mm_sub_epi8(src, avg);
_mm_storeu_si128((__m128i*)&out[i], res);
}
if (i != num_pixels) {
VP8LPredictorsSub_C[10](in + i, upper + i, num_pixels - i, out + i);
}
}
// Predictor11: select.
static void GetSumAbsDiff32_SSE2(const __m128i* const A, const __m128i* const B,
__m128i* const out) {
// We can unpack with any value on the upper 32 bits, provided it's the same
// on both operands (to that their sum of abs diff is zero). Here we use *A.
const __m128i A_lo = _mm_unpacklo_epi32(*A, *A);
const __m128i B_lo = _mm_unpacklo_epi32(*B, *A);
const __m128i A_hi = _mm_unpackhi_epi32(*A, *A);
const __m128i B_hi = _mm_unpackhi_epi32(*B, *A);
const __m128i s_lo = _mm_sad_epu8(A_lo, B_lo);
const __m128i s_hi = _mm_sad_epu8(A_hi, B_hi);
*out = _mm_packs_epi32(s_lo, s_hi);
}
static void PredictorSub11_SSE2(const uint32_t* in, const uint32_t* upper,
int num_pixels, uint32_t* out) {
int i;
for (i = 0; i + 4 <= num_pixels; i += 4) {
const __m128i L = _mm_loadu_si128((const __m128i*)&in[i - 1]);
const __m128i T = _mm_loadu_si128((const __m128i*)&upper[i]);
const __m128i TL = _mm_loadu_si128((const __m128i*)&upper[i - 1]);
const __m128i src = _mm_loadu_si128((const __m128i*)&in[i]);
__m128i pa, pb;
GetSumAbsDiff32_SSE2(&T, &TL, &pa); // pa = sum |T-TL|
GetSumAbsDiff32_SSE2(&L, &TL, &pb); // pb = sum |L-TL|
{
const __m128i mask = _mm_cmpgt_epi32(pb, pa);
const __m128i A = _mm_and_si128(mask, L);
const __m128i B = _mm_andnot_si128(mask, T);
const __m128i pred = _mm_or_si128(A, B); // pred = (L > T)? L : T
const __m128i res = _mm_sub_epi8(src, pred);
_mm_storeu_si128((__m128i*)&out[i], res);
}
}
if (i != num_pixels) {
VP8LPredictorsSub_C[11](in + i, upper + i, num_pixels - i, out + i);
}
}
// Predictor12: ClampedSubSubtractFull.
static void PredictorSub12_SSE2(const uint32_t* in, const uint32_t* upper,
int num_pixels, uint32_t* out) {
int i;
const __m128i zero = _mm_setzero_si128();
for (i = 0; i + 4 <= num_pixels; i += 4) {
const __m128i src = _mm_loadu_si128((const __m128i*)&in[i]);
const __m128i L = _mm_loadu_si128((const __m128i*)&in[i - 1]);
const __m128i L_lo = _mm_unpacklo_epi8(L, zero);
const __m128i L_hi = _mm_unpackhi_epi8(L, zero);
const __m128i T = _mm_loadu_si128((const __m128i*)&upper[i]);
const __m128i T_lo = _mm_unpacklo_epi8(T, zero);
const __m128i T_hi = _mm_unpackhi_epi8(T, zero);
const __m128i TL = _mm_loadu_si128((const __m128i*)&upper[i - 1]);
const __m128i TL_lo = _mm_unpacklo_epi8(TL, zero);
const __m128i TL_hi = _mm_unpackhi_epi8(TL, zero);
const __m128i diff_lo = _mm_sub_epi16(T_lo, TL_lo);
const __m128i diff_hi = _mm_sub_epi16(T_hi, TL_hi);
const __m128i pred_lo = _mm_add_epi16(L_lo, diff_lo);
const __m128i pred_hi = _mm_add_epi16(L_hi, diff_hi);
const __m128i pred = _mm_packus_epi16(pred_lo, pred_hi);
const __m128i res = _mm_sub_epi8(src, pred);
_mm_storeu_si128((__m128i*)&out[i], res);
}
if (i != num_pixels) {
VP8LPredictorsSub_C[12](in + i, upper + i, num_pixels - i, out + i);
}
}
// Predictors13: ClampedAddSubtractHalf
static void PredictorSub13_SSE2(const uint32_t* in, const uint32_t* upper,
int num_pixels, uint32_t* out) {
int i;
const __m128i zero = _mm_setzero_si128();
for (i = 0; i + 2 <= num_pixels; i += 2) {
// we can only process two pixels at a time
const __m128i L = _mm_loadl_epi64((const __m128i*)&in[i - 1]);
const __m128i src = _mm_loadl_epi64((const __m128i*)&in[i]);
const __m128i T = _mm_loadl_epi64((const __m128i*)&upper[i]);
const __m128i TL = _mm_loadl_epi64((const __m128i*)&upper[i - 1]);
const __m128i L_lo = _mm_unpacklo_epi8(L, zero);
const __m128i T_lo = _mm_unpacklo_epi8(T, zero);
const __m128i TL_lo = _mm_unpacklo_epi8(TL, zero);
const __m128i sum = _mm_add_epi16(T_lo, L_lo);
const __m128i avg = _mm_srli_epi16(sum, 1);
const __m128i A1 = _mm_sub_epi16(avg, TL_lo);
const __m128i bit_fix = _mm_cmpgt_epi16(TL_lo, avg);
const __m128i A2 = _mm_sub_epi16(A1, bit_fix);
const __m128i A3 = _mm_srai_epi16(A2, 1);
const __m128i A4 = _mm_add_epi16(avg, A3);
const __m128i pred = _mm_packus_epi16(A4, A4);
const __m128i res = _mm_sub_epi8(src, pred);
_mm_storel_epi64((__m128i*)&out[i], res);
}
if (i != num_pixels) {
VP8LPredictorsSub_C[13](in + i, upper + i, num_pixels - i, out + i);
}
}
//------------------------------------------------------------------------------
// Entry point
extern void VP8LEncDspInitSSE2(void);
WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitSSE2(void) {
VP8LSubtractGreenFromBlueAndRed = SubtractGreenFromBlueAndRed_SSE2;
VP8LTransformColor = TransformColor_SSE2;
VP8LCollectColorBlueTransforms = CollectColorBlueTransforms_SSE2;
VP8LCollectColorRedTransforms = CollectColorRedTransforms_SSE2;
VP8LAddVector = AddVector_SSE2;
VP8LAddVectorEq = AddVectorEq_SSE2;
#if !defined(DONT_USE_COMBINED_SHANNON_ENTROPY_SSE2_FUNC)
VP8LCombinedShannonEntropy = CombinedShannonEntropy_SSE2;
#endif
VP8LVectorMismatch = VectorMismatch_SSE2;
VP8LBundleColorMap = BundleColorMap_SSE2;
VP8LPredictorsSub[0] = PredictorSub0_SSE2;
VP8LPredictorsSub[1] = PredictorSub1_SSE2;
VP8LPredictorsSub[2] = PredictorSub2_SSE2;
VP8LPredictorsSub[3] = PredictorSub3_SSE2;
VP8LPredictorsSub[4] = PredictorSub4_SSE2;
VP8LPredictorsSub[5] = PredictorSub5_SSE2;
VP8LPredictorsSub[6] = PredictorSub6_SSE2;
VP8LPredictorsSub[7] = PredictorSub7_SSE2;
VP8LPredictorsSub[8] = PredictorSub8_SSE2;
VP8LPredictorsSub[9] = PredictorSub9_SSE2;
VP8LPredictorsSub[10] = PredictorSub10_SSE2;
VP8LPredictorsSub[11] = PredictorSub11_SSE2;
VP8LPredictorsSub[12] = PredictorSub12_SSE2;
VP8LPredictorsSub[13] = PredictorSub13_SSE2;
VP8LPredictorsSub[14] = PredictorSub0_SSE2; // <- padding security sentinels
VP8LPredictorsSub[15] = PredictorSub0_SSE2;
}
#else // !WEBP_USE_SSE2
WEBP_DSP_INIT_STUB(VP8LEncDspInitSSE2)
#endif // WEBP_USE_SSE2