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countNonZero

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This commit is contained in:
Ilya Lavrenov 2015-01-12 10:59:28 +03:00
parent 972ff1d0c4
commit 5578088983
1 changed files with 106 additions and 19 deletions
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125
modules/core/src/stat.cpp
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@ -396,6 +396,27 @@ static int countNonZero_(const T* src, int len )
return nz;
}
static const uchar * initPopcountTable()
{
static uchar tab[256];
static volatile bool initialized = false;
if( !initialized )
{
// we compute inverse popcount table,
// since we pass (img[x] == 0) mask as index in the table.
for( int j = 0; j < 256; j++ )
{
int val = 0;
for( int mask = 1; mask < 256; mask += mask )
val += (j & mask) == 0;
tab[j] = (uchar)val;
}
initialized = true;
}
return tab;
}
static int countNonZero8u( const uchar* src, int len )
{
int i=0, nz = 0;
@ -403,21 +424,7 @@ static int countNonZero8u( const uchar* src, int len )
if(USE_SSE2)//5x-6x
{
__m128i pattern = _mm_setzero_si128 ();
static uchar tab[256];
static volatile bool initialized = false;
if( !initialized )
{
// we compute inverse popcount table,
// since we pass (img[x] == 0) mask as index in the table.
for( int j = 0; j < 256; j++ )
{
int val = 0;
for( int mask = 1; mask < 256; mask += mask )
val += (j & mask) == 0;
tab[j] = (uchar)val;
}
initialized = true;
}
static const uchar * tab = initPopcountTable();
for (; i<=len-16; i+=16)
{
@ -467,7 +474,22 @@ static int countNonZero8u( const uchar* src, int len )
static int countNonZero16u( const ushort* src, int len )
{
int i = 0, nz = 0;
#if CV_NEON
#if CV_SSE2
if (USE_SSE2)
{
__m128i v_zero = _mm_setzero_si128 ();
static const uchar * tab = initPopcountTable();
for ( ; i <= len - 8; i += 8)
{
__m128i v_src = _mm_loadu_si128((const __m128i*)(src + i));
int val = _mm_movemask_epi8(_mm_packs_epi16(_mm_cmpeq_epi16(v_src, v_zero), v_zero));
nz += tab[val];
}
src += i;
}
#elif CV_NEON
int len0 = len & -8, blockSize1 = (1 << 15), blockSize0 = blockSize1 << 6;
uint32x4_t v_nz = vdupq_n_u32(0u);
uint16x8_t v_zero = vdupq_n_u16(0), v_1 = vdupq_n_u16(1);
@ -503,7 +525,27 @@ static int countNonZero16u( const ushort* src, int len )
static int countNonZero32s( const int* src, int len )
{
int i = 0, nz = 0;
#if CV_NEON
#if CV_SSE2
if (USE_SSE2)
{
__m128i v_zero = _mm_setzero_si128 ();
static const uchar * tab = initPopcountTable();
for ( ; i <= len - 8; i += 8)
{
__m128i v_src = _mm_loadu_si128((const __m128i*)(src + i));
__m128i v_dst0 = _mm_cmpeq_epi32(v_src, v_zero);
v_src = _mm_loadu_si128((const __m128i*)(src + i + 4));
__m128i v_dst1 = _mm_cmpeq_epi32(v_src, v_zero);
int val = _mm_movemask_epi8(_mm_packs_epi16(_mm_packs_epi32(v_dst0, v_dst1), v_zero));
nz += tab[val];
}
src += i;
}
#elif CV_NEON
int len0 = len & -8, blockSize1 = (1 << 15), blockSize0 = blockSize1 << 6;
uint32x4_t v_nz = vdupq_n_u32(0u);
int32x4_t v_zero = vdupq_n_s32(0.0f);
@ -541,7 +583,25 @@ static int countNonZero32s( const int* src, int len )
static int countNonZero32f( const float* src, int len )
{
int i = 0, nz = 0;
#if CV_NEON
#if CV_SSE2
if (USE_SSE2)
{
__m128i v_zero_i = _mm_setzero_si128();
__m128 v_zero_f = _mm_setzero_ps();
static const uchar * tab = initPopcountTable();
for ( ; i <= len - 8; i += 8)
{
__m128i v_dst0 = _mm_castps_si128(_mm_cmpeq_ps(_mm_loadu_ps(src + i), v_zero_f));
__m128i v_dst1 = _mm_castps_si128(_mm_cmpeq_ps(_mm_loadu_ps(src + i + 4), v_zero_f));
int val = _mm_movemask_epi8(_mm_packs_epi16(_mm_packs_epi32(v_dst0, v_dst1), v_zero_i));
nz += tab[val];
}
src += i;
}
#elif CV_NEON
int len0 = len & -8, blockSize1 = (1 << 15), blockSize0 = blockSize1 << 6;
uint32x4_t v_nz = vdupq_n_u32(0u);
float32x4_t v_zero = vdupq_n_f32(0.0f);
@ -577,7 +637,34 @@ static int countNonZero32f( const float* src, int len )
}
static int countNonZero64f( const double* src, int len )
{ return countNonZero_(src, len); }
{
int i = 0, nz = 0;
#if CV_SSE2
if (USE_SSE2)
{
__m128i v_zero_i = _mm_setzero_si128();
__m128d v_zero_d = _mm_setzero_pd();
static const uchar * tab = initPopcountTable();
for ( ; i <= len - 8; i += 8)
{
__m128i v_dst0 = _mm_castpd_si128(_mm_cmpeq_pd(_mm_loadu_pd(src + i), v_zero_d));
__m128i v_dst1 = _mm_castpd_si128(_mm_cmpeq_pd(_mm_loadu_pd(src + i + 2), v_zero_d));
__m128i v_dst2 = _mm_castpd_si128(_mm_cmpeq_pd(_mm_loadu_pd(src + i + 4), v_zero_d));
__m128i v_dst3 = _mm_castpd_si128(_mm_cmpeq_pd(_mm_loadu_pd(src + i + 6), v_zero_d));
v_dst0 = _mm_packs_epi32(v_dst0, v_dst1);
v_dst1 = _mm_packs_epi32(v_dst2, v_dst3);
int val = _mm_movemask_epi8(_mm_packs_epi16(_mm_packs_epi32(v_dst0, v_dst1), v_zero_i));
nz += tab[val];
}
src += i;
}
#endif
return nz + countNonZero_(src, len - i);
}
typedef int (*CountNonZeroFunc)(const uchar*, int);