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AVX2 version of plot min max calculation.

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Slightly faster (~5%) than the autovectorized serial code.
This commit is contained in:
Bartosz Taudul 2019-07-29 20:59:22 +02:00
parent 7a878cf4c7
commit 5dff7b5d1e
1 changed files with 39 additions and 0 deletions
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39
server/TracyView.cpp
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@ -17,6 +17,14 @@
#include <stdlib.h>
#include <time.h>
#ifdef __AVX2__
# ifdef _MSC_VER
# include <intrin.h>
# else
# include <x86intrin.h>
# endif
#endif
#include "../common/TracyMutex.hpp"
#include "../common/TracyProtocol.hpp"
#include "../common/TracySystem.hpp"
@ -3686,11 +3694,42 @@ int View::DrawPlots( int offset, double pxns, const ImVec2& wpos, bool hover, fl
auto tmp = it;
++tmp;
const auto sz = end - tmp;
#ifdef __AVX2__
__m256d vmin = _mm256_set1_pd( min );
__m256d vmax = vmin;
const auto ssz = sz / 4;
for( ptrdiff_t i=0; i<ssz; i++ )
{
__m256d v0 = _mm256_loadu_pd( (const double*)(tmp+0) );
__m256d v1 = _mm256_loadu_pd( (const double*)(tmp+2) );
__m256d v = _mm256_unpackhi_pd( v0, v1 );
vmin = _mm256_min_pd( vmin, v );
vmax = _mm256_max_pd( vmax, v );
tmp += 4;
}
__m256d min0 = _mm256_shuffle_pd( vmin, vmin, 5 );
__m256d max0 = _mm256_shuffle_pd( vmax, vmax, 5 );
__m256d min1 = _mm256_min_pd( vmin, min0 );
__m256d max1 = _mm256_max_pd( vmax, max0 );
__m256d min2 = _mm256_permute4x64_pd( min1, _MM_SHUFFLE( 0, 0, 2, 2 ) );
__m256d max2 = _mm256_permute4x64_pd( max1, _MM_SHUFFLE( 0, 0, 2, 2 ) );
__m256d min3 = _mm256_min_pd( min1, min2 );
__m256d max3 = _mm256_max_pd( max1, max2 );
min = _mm256_cvtsd_f64( min3 );
max = _mm256_cvtsd_f64( max3 );
const auto lsz = sz % 4;
for( ptrdiff_t i=0; i<lsz; i++ )
{
min = tmp[i].val < min ? tmp[i].val : min;
max = tmp[i].val > max ? tmp[i].val : max;
}
#else
for( ptrdiff_t i=0; i<sz; i++ )
{
min = tmp[i].val < min ? tmp[i].val : min;
max = tmp[i].val > max ? tmp[i].val : max;
}
#endif
}
if( min == max )
{