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avx_kernel.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <immintrin.h>
#include <sys/time.h>
#include "init_array.h"
#ifdef USE_IACA
#include "/home/mic/iaca-lin32/include/iacaMarks.h"
#endif
#include <iostream>
using namespace std;
#ifdef __INTEL_COMPILER
inline __m256d operator + (const __m256d A, const __m256d B)
{
return _mm256_add_pd(A, B);
}
inline __m256d operator - (const __m256d A, const __m256d B)
{
return _mm256_sub_pd(A, B);
}
inline __m256d operator * (const __m256d A, const __m256d B)
{
return _mm256_mul_pd(A, B);
}
#endif
//
// Each iteration contains 48,000 instructions
// x and y are used to seed the data
//
double avx_kernel(double x,double y,size_t iterations){
register __m256d r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,rA,rB,rC,rD,rE,rF;
double *vals = (double *) _mm_malloc(16*4*sizeof(double),32);
init_array(vals,64);
//__declspec((align(32)) double constants[4] = {
// 0.37796447300922722721,
//};
/**
// Generate starting data.
r0 = _mm256_set1_pd(x);
r1 = _mm256_set1_pd(y);
r8 = _mm256_set1_pd(-0.0);
r2 = _mm256_xor_pd(r0,r8);
r3 = _mm256_or_pd(r0,r8);
r4 = _mm256_andnot_pd(r8,r0);
r5 = _mm256_mul_pd(r1,_mm256_set1_pd(0.37796447300922722721));
r6 = _mm256_mul_pd(r1,_mm256_set1_pd(0.24253562503633297352));
r7 = _mm256_mul_pd(r1,_mm256_set1_pd(4.1231056256176605498));
r8 = _mm256_add_pd(r0,_mm256_set1_pd(0.37796447300922722721));
r9 = _mm256_add_pd(r1,_mm256_set1_pd(0.24253562503633297352));
rA = _mm256_sub_pd(r0,_mm256_set1_pd(4.1231056256176605498));
rB = _mm256_sub_pd(r1,_mm256_set1_pd(4.1231056256176605498));
rC = _mm256_set1_pd(1.4142135623730950488);
rD = _mm256_set1_pd(1.7320508075688772935);
rE = _mm256_set1_pd(0.57735026918962576451);
rF = _mm256_set1_pd(0.70710678118654752440);
**/
unsigned long long iMASK = 0x800fffffffffffffull;
__m256d MASK = _mm256_set1_pd(*(double*)&iMASK);
__m256d vONE = _mm256_set1_pd(1.0);
r0 = _mm256_load_pd(vals+0);
r1 = _mm256_load_pd(vals+4);
r2 = _mm256_load_pd(vals+8);
r3 = _mm256_load_pd(vals+12);
r4 = _mm256_load_pd(vals+16);
r5 = _mm256_load_pd(vals+20);
r6 = _mm256_load_pd(vals+24);
r7 = _mm256_load_pd(vals+28);
r8 = _mm256_load_pd(vals+32);
r9 = _mm256_load_pd(vals+36);
rA = _mm256_load_pd(vals+40);
rB = _mm256_load_pd(vals+44);
rC = _mm256_load_pd(vals+48);
rD = _mm256_load_pd(vals+52);
rE = _mm256_load_pd(vals+56);
rF = _mm256_load_pd(vals+60);
for (int w =0; w<64; w++) {
printf("vals[%d]=%e\n", w , vals[w]);
}
size_t c = 0;
while (c < iterations){
size_t i = 0;
while (i < 1000/UNROLLS) {
#ifdef USE_IACA
IACA_START
#endif
// - 48 Instructions per loop
// - 48*4 = 192 flops per loop
// Inlude the Kernel
#include "kernel_include.cpp"
#ifdef USE_IACA
IACA_END
#endif
i++;
}
if (c==0) {
double out = ((double*)&r6)[0];
printf("before r0=%e\n",out);
}
/**
// Need to renormalize to prevent denormal/overflow.
r0 = _mm256_and_pd(r0,MASK);
r1 = _mm256_and_pd(r1,MASK);
r2 = _mm256_and_pd(r2,MASK);
r3 = _mm256_and_pd(r3,MASK);
r4 = _mm256_and_pd(r4,MASK);
r5 = _mm256_and_pd(r5,MASK);
r6 = _mm256_and_pd(r6,MASK);
r7 = _mm256_and_pd(r7,MASK);
r8 = _mm256_and_pd(r8,MASK);
r9 = _mm256_and_pd(r9,MASK);
rA = _mm256_and_pd(rA,MASK);
rB = _mm256_and_pd(rB,MASK);
r0 = _mm256_or_pd(r0,vONE);
r1 = _mm256_or_pd(r1,vONE);
r2 = _mm256_or_pd(r2,vONE);
r3 = _mm256_or_pd(r3,vONE);
r4 = _mm256_or_pd(r4,vONE);
r5 = _mm256_or_pd(r5,vONE);
r6 = _mm256_or_pd(r6,vONE);
r7 = _mm256_or_pd(r7,vONE);
r8 = _mm256_or_pd(r8,vONE);
r9 = _mm256_or_pd(r9,vONE);
rA = _mm256_or_pd(rA,vONE);
rB = _mm256_or_pd(rB,vONE);
**/
if (c==100) {
double out = ((double*)&r6)[0];
printf("after r0=%e\n",out);
}
c++;
}
_mm_free(vals);
r0 = _mm256_add_pd(r0,r1);
r2 = _mm256_add_pd(r2,r3);
r4 = _mm256_add_pd(r4,r5);
r6 = _mm256_add_pd(r6,r7);
r8 = _mm256_add_pd(r8,r9);
rA = _mm256_add_pd(rA,rB);
r0 = _mm256_add_pd(r0,r2);
r4 = _mm256_add_pd(r4,r6);
r8 = _mm256_add_pd(r8,rA);
r0 = _mm256_add_pd(r0,r4);
r0 = _mm256_add_pd(r0,r8);
// Prevent Dead Code Elimination
double out = 0;
out += ((double*)&r0)[0];
out += ((double*)&r0)[1];
out += ((double*)&r0)[2];
out += ((double*)&r0)[3];
return out + x + y;
}