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filter.cpp
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#include "common.h"
#include <immintrin.h>
#include <math.h>
void slow_performance1(double *x, double* h, double* y, int N, int M) {
for (int i = 0; i < N - (M - 1); i++) {
y[i] = 0.0;
for (int k = 0; k < M; k++) {
y[i] += h[k] * fabs(x[i + (M - 1) - k]);
}
}
}
void maxperformance(double *x, double* h, double* y, int N, int M) {
/* This is the most optimized version. */
__m256d signMask=_mm256_set1_pd(-0.0);
// __m256d xVector,xVector2;
// __m256d acc1;
__m256d zeros=_mm256_setzero_pd();
__m256d h0,h1,h2,h3,x0,x1,x2,x3;
__m256d x0u,x1u,x2u,x3u;
__m256d x0u2,x1u2,x2u2,x3u2;
__m256d x0u3,x1u3,x2u3,x3u3;
h0=_mm256_set1_pd(h[0]);
h1=_mm256_set1_pd(h[1]);
h2=_mm256_set1_pd(h[2]);
h3=_mm256_set1_pd(h[3]);
int end=N-N%16;
int i=0;
for(;i<end;i+=16)
{
// acc1=zeros;
x0=_mm256_loadu_pd(x+i+3);
x0=_mm256_andnot_pd(signMask,x0);
x0=_mm256_mul_pd(h0,x0);
x1=_mm256_loadu_pd(x+i+2);
x1=_mm256_andnot_pd(signMask,x1);
x0=_mm256_fmadd_pd(h1,x1,x0);
x2=_mm256_loadu_pd(x+i+1);
x2=_mm256_andnot_pd(signMask,x2);
x0=_mm256_fmadd_pd(h2,x2,x0);
x3=_mm256_loadu_pd(x+i);
x3=_mm256_andnot_pd(signMask,x3);
// x3=_mm256_fmadd_pd(h3,x3,zeros);
x0=_mm256_fmadd_pd(h3,x3,x0);
_mm256_storeu_pd(y+i,x0);
// acc1=zeros;
x0u=_mm256_loadu_pd(x+i+7);
x0u=_mm256_andnot_pd(signMask,x0u);
x0u=_mm256_fmadd_pd(h0,x0u,zeros);
x1u=_mm256_loadu_pd(x+i+6);
x1u=_mm256_andnot_pd(signMask,x1u);
x0u=_mm256_fmadd_pd(h1,x1u,x0u);
x2u=_mm256_loadu_pd(x+i+5);
x2u=_mm256_andnot_pd(signMask,x2u);
x0u=_mm256_fmadd_pd(h2,x2u,x0u);
x3u=_mm256_loadu_pd(x+i+4);
x3u=_mm256_andnot_pd(signMask,x3u);
x0u=_mm256_fmadd_pd(h3,x3u,x0u);
_mm256_storeu_pd(y+i+4,x0u);
x0u2=_mm256_loadu_pd(x+i+11);
x0u2=_mm256_andnot_pd(signMask,x0u2);
x0u2=_mm256_fmadd_pd(h0,x0u2,zeros);
x1u2=_mm256_loadu_pd(x+i+10);
x1u2=_mm256_andnot_pd(signMask,x1u2);
x0u2=_mm256_fmadd_pd(h1,x1u2,x0u2);
x2u2=_mm256_loadu_pd(x+i+9);
x2u2=_mm256_andnot_pd(signMask,x2u2);
x0u2=_mm256_fmadd_pd(h2,x2u2,x0u2);
x3u2=_mm256_loadu_pd(x+i+8);
x3u2=_mm256_andnot_pd(signMask,x3u2);
x0u2=_mm256_fmadd_pd(h3,x3u2,x0u2);
_mm256_storeu_pd(y+i+8,x0u2);
x0u3=_mm256_loadu_pd(x+i+15);
x0u3=_mm256_andnot_pd(signMask,x0u3);
x0u3=_mm256_fmadd_pd(h0,x0u3,zeros);
x1u3=_mm256_loadu_pd(x+i+14);
x1u3=_mm256_andnot_pd(signMask,x1u3);
x0u3=_mm256_fmadd_pd(h1,x1u3,x0u3);
x2u3=_mm256_loadu_pd(x+i+13);
x2u3=_mm256_andnot_pd(signMask,x2u3);
x0u3=_mm256_fmadd_pd(h2,x2u3,x0u3);
x3u3=_mm256_loadu_pd(x+i+12);
x3u3=_mm256_andnot_pd(signMask,x3u3);
x0u3=_mm256_fmadd_pd(h3,x3u3,x0u3);
// _mm256_store_pd(y+i,_mm256_add_pd(acc,acc2));
_mm256_storeu_pd(y+i+12,x0u3);
}
//remaining elements
//assume M=4
for (; i < N - (M - 1); i++)
{
y[i]=h[0]*fabs(x[i+3])+h[1]*fabs(x[i+2])+h[2]*fabs(x[i+1])+h[3]*fabs(x[i]);
}
}
/*
* Called by the driver to register your functions
* Use add_function(func, description) to add your own functions
*/
void register_functions()
{
add_function(&slow_performance1, "slow_performance1",1);
add_function(&maxperformance, "maxperformance",1);
}