/* *  Copyright 2012 The LibYuv Project Authors. All rights reserved. * *  Use of this source code is governed by a BSD-style license *  that can be found in the LICENSE file in the root of the source *  tree. An additional intellectual property rights grant can be found *  in the file PATENTS. All contributing project authors may *  be found in the AUTHORS file in the root of the source tree. */ #include "libyuv/basic_types.h" #include "libyuv/compare_row.h"#include "libyuv/row.h" #if defined(_MSC_VER)#include <intrin.h>  // For __popcnt#endif #ifdef __cplusplusnamespace libyuv {extern "C" {#endif // This module is for 32 bit Visual C x86 and clangcl#if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && defined(_MSC_VER) uint32_t HammingDistance_SSE42(const uint8_t* src_a,                               const uint8_t* src_b,                               int count) {  uint32_t diff = 0u;   int i;  for (i = 0; i < count - 3; i += 4) {    uint32_t x = *((uint32_t*)src_a) ^ *((uint32_t*)src_b);  // NOLINT    src_a += 4;    src_b += 4;    diff += __popcnt(x);  }  return diff;} __declspec(naked) uint32_t    SumSquareError_SSE2(const uint8_t* src_a, const uint8_t* src_b, int count) {  __asm {    mov        eax, [esp + 4]  // src_a    mov        edx, [esp + 8]  // src_b    mov        ecx, [esp + 12]  // count    pxor       xmm0, xmm0    pxor       xmm5, xmm5   wloop:    movdqu     xmm1, [eax]    lea        eax,  [eax + 16]    movdqu     xmm2, [edx]    lea        edx,  [edx + 16]    movdqa     xmm3, xmm1  // abs trick    psubusb    xmm1, xmm2    psubusb    xmm2, xmm3    por        xmm1, xmm2    movdqa     xmm2, xmm1    punpcklbw  xmm1, xmm5    punpckhbw  xmm2, xmm5    pmaddwd    xmm1, xmm1    pmaddwd    xmm2, xmm2    paddd      xmm0, xmm1    paddd      xmm0, xmm2    sub        ecx, 16    jg         wloop     pshufd     xmm1, xmm0, 0xee    paddd      xmm0, xmm1    pshufd     xmm1, xmm0, 0x01    paddd      xmm0, xmm1    movd       eax, xmm0    ret  }} // Visual C 2012 required for AVX2.#if _MSC_VER >= 1700// C4752: found Intel(R) Advanced Vector Extensions; consider using /arch:AVX.#pragma warning(disable : 4752)__declspec(naked) uint32_t    SumSquareError_AVX2(const uint8_t* src_a, const uint8_t* src_b, int count) {  __asm {    mov        eax, [esp + 4]  // src_a    mov        edx, [esp + 8]  // src_b    mov        ecx, [esp + 12]  // count    vpxor      ymm0, ymm0, ymm0  // sum    vpxor      ymm5, ymm5, ymm5  // constant 0 for unpck    sub        edx, eax   wloop:    vmovdqu    ymm1, [eax]    vmovdqu    ymm2, [eax + edx]    lea        eax,  [eax + 32]    vpsubusb   ymm3, ymm1, ymm2  // abs difference trick    vpsubusb   ymm2, ymm2, ymm1    vpor       ymm1, ymm2, ymm3    vpunpcklbw ymm2, ymm1, ymm5  // u16.  mutates order.    vpunpckhbw ymm1, ymm1, ymm5    vpmaddwd   ymm2, ymm2, ymm2  // square + hadd to u32.    vpmaddwd   ymm1, ymm1, ymm1    vpaddd     ymm0, ymm0, ymm1    vpaddd     ymm0, ymm0, ymm2    sub        ecx, 32    jg         wloop     vpshufd    ymm1, ymm0, 0xee  // 3, 2 + 1, 0 both lanes.    vpaddd     ymm0, ymm0, ymm1    vpshufd    ymm1, ymm0, 0x01  // 1 + 0 both lanes.    vpaddd     ymm0, ymm0, ymm1    vpermq     ymm1, ymm0, 0x02  // high + low lane.    vpaddd     ymm0, ymm0, ymm1    vmovd      eax, xmm0    vzeroupper    ret  }}#endif  // _MSC_VER >= 1700 uvec32 kHash16x33 = {0x92d9e201, 0, 0, 0};  // 33 ^ 16uvec32 kHashMul0 = {    0x0c3525e1,  // 33 ^ 15    0xa3476dc1,  // 33 ^ 14    0x3b4039a1,  // 33 ^ 13    0x4f5f0981,  // 33 ^ 12};uvec32 kHashMul1 = {    0x30f35d61,  // 33 ^ 11    0x855cb541,  // 33 ^ 10    0x040a9121,  // 33 ^ 9    0x747c7101,  // 33 ^ 8};uvec32 kHashMul2 = {    0xec41d4e1,  // 33 ^ 7    0x4cfa3cc1,  // 33 ^ 6    0x025528a1,  // 33 ^ 5    0x00121881,  // 33 ^ 4};uvec32 kHashMul3 = {    0x00008c61,  // 33 ^ 3    0x00000441,  // 33 ^ 2    0x00000021,  // 33 ^ 1    0x00000001,  // 33 ^ 0}; __declspec(naked) uint32_t    HashDjb2_SSE41(const uint8_t* src, int count, uint32_t seed) {  __asm {    mov        eax, [esp + 4]  // src    mov        ecx, [esp + 8]  // count    movd       xmm0, [esp + 12]  // seed     pxor       xmm7, xmm7  // constant 0 for unpck    movdqa     xmm6, xmmword ptr kHash16x33   wloop:    movdqu     xmm1, [eax]  // src[0-15]    lea        eax, [eax + 16]    pmulld     xmm0, xmm6  // hash *= 33 ^ 16    movdqa     xmm5, xmmword ptr kHashMul0    movdqa     xmm2, xmm1    punpcklbw  xmm2, xmm7  // src[0-7]    movdqa     xmm3, xmm2    punpcklwd  xmm3, xmm7  // src[0-3]    pmulld     xmm3, xmm5    movdqa     xmm5, xmmword ptr kHashMul1    movdqa     xmm4, xmm2    punpckhwd  xmm4, xmm7  // src[4-7]    pmulld     xmm4, xmm5    movdqa     xmm5, xmmword ptr kHashMul2    punpckhbw  xmm1, xmm7  // src[8-15]    movdqa     xmm2, xmm1    punpcklwd  xmm2, xmm7  // src[8-11]    pmulld     xmm2, xmm5    movdqa     xmm5, xmmword ptr kHashMul3    punpckhwd  xmm1, xmm7  // src[12-15]    pmulld     xmm1, xmm5    paddd      xmm3, xmm4  // add 16 results    paddd      xmm1, xmm2    paddd      xmm1, xmm3     pshufd     xmm2, xmm1, 0x0e  // upper 2 dwords    paddd      xmm1, xmm2    pshufd     xmm2, xmm1, 0x01    paddd      xmm1, xmm2    paddd      xmm0, xmm1    sub        ecx, 16    jg         wloop     movd       eax, xmm0  // return hash    ret  }} // Visual C 2012 required for AVX2.#if _MSC_VER >= 1700__declspec(naked) uint32_t    HashDjb2_AVX2(const uint8_t* src, int count, uint32_t seed) {  __asm {    mov        eax, [esp + 4]  // src    mov        ecx, [esp + 8]  // count    vmovd      xmm0, [esp + 12]  // seed   wloop:    vpmovzxbd  xmm3, [eax]  // src[0-3]    vpmulld    xmm0, xmm0, xmmword ptr kHash16x33  // hash *= 33 ^ 16    vpmovzxbd  xmm4, [eax + 4]  // src[4-7]    vpmulld    xmm3, xmm3, xmmword ptr kHashMul0    vpmovzxbd  xmm2, [eax + 8]  // src[8-11]    vpmulld    xmm4, xmm4, xmmword ptr kHashMul1    vpmovzxbd  xmm1, [eax + 12]  // src[12-15]    vpmulld    xmm2, xmm2, xmmword ptr kHashMul2    lea        eax, [eax + 16]    vpmulld    xmm1, xmm1, xmmword ptr kHashMul3    vpaddd     xmm3, xmm3, xmm4  // add 16 results    vpaddd     xmm1, xmm1, xmm2    vpaddd     xmm1, xmm1, xmm3    vpshufd    xmm2, xmm1, 0x0e  // upper 2 dwords    vpaddd     xmm1, xmm1,xmm2    vpshufd    xmm2, xmm1, 0x01    vpaddd     xmm1, xmm1, xmm2    vpaddd     xmm0, xmm0, xmm1    sub        ecx, 16    jg         wloop     vmovd      eax, xmm0  // return hash    vzeroupper    ret  }}#endif  // _MSC_VER >= 1700 #endif  // !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) #ifdef __cplusplus}  // extern "C"}  // namespace libyuv#endif