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Merge pull request #11162 from kinchungwong:master

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Alexander Alekhin 2018-03-27 13:27:43 +00:00
commit 017c217bb0
1 changed files with 1 additions and 5 deletions
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6
modules/objdetect/src/hog.cpp
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@ -323,14 +323,10 @@ void HOGDescriptor::computeGradient(const Mat& img, Mat& grad, Mat& qangle,
int end = gradsize.width + 2; int end = gradsize.width + 2;
xmap -= 1, x = 0; xmap -= 1, x = 0;
#if CV_SSE2 #if CV_SSE2
__m128i ithree = _mm_set1_epi32(3);
for ( ; x <= end - 4; x += 4) for ( ; x <= end - 4; x += 4)
{ {
//emulation of _mm_mullo_epi32
__m128i mul_res = _mm_loadu_si128((const __m128i*)(xmap + x)); __m128i mul_res = _mm_loadu_si128((const __m128i*)(xmap + x));
__m128i tmp1 = _mm_mul_epu32(ithree, mul_res); mul_res = _mm_add_epi32(_mm_add_epi32(mul_res, mul_res), mul_res); // multiply by 3
__m128i tmp2 = _mm_mul_epu32( _mm_srli_si128(ithree,4), _mm_srli_si128(mul_res,4));
mul_res = _mm_unpacklo_epi32(_mm_shuffle_epi32(tmp1, _MM_SHUFFLE (0,0,2,0)), _mm_shuffle_epi32(tmp2, _MM_SHUFFLE (0,0,2,0)));
_mm_storeu_si128((__m128i*)(xmap + x), mul_res); _mm_storeu_si128((__m128i*)(xmap + x), mul_res);
} }
#elif CV_NEON #elif CV_NEON