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gradient_GPU.cu
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Wed, Oct 16, 10:50

gradient_GPU.cu
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#include "gradient_GPU.cuh"
#include <iostream>
#include <string.h>
#include <cuda_runtime.h>
#include <math.h>
#include <sys/time.h>
#include <fstream>
#include <immintrin.h>
#include <map>
/*
#ifdef __AVX__
#include "simd_math_avx.h"
#endif
#ifdef __AVX512F__
#include "simd_math_avx512f.h"
#endif
*/
#include "structure_hpc.h"
#include "utils.hpp"
//
// SOA versions, vectorizable
//
__device__ struct point module_potentialDerivatives_totalGradient_5_SOA_GPU(const struct point *pImage, const struct Potential_SOA *lens, int shalos, int nhalos)
{
//asm volatile("# module_potentialDerivatives_totalGradient_SIS_SOA begins");
//
struct point grad, clumpgrad;
grad.x = 0;
grad.y = 0;
for(int i = shalos; i < shalos + nhalos; i++)
{
//
struct point true_coord, true_coord_rotation;
//
true_coord.x = pImage->x - lens->position_x[i];
true_coord.y = pImage->y - lens->position_y[i];
//
true_coord_rotation = rotateCoordinateSystem_GPU(true_coord, lens->ellipticity_angle[i]);
double R = sqrt(true_coord_rotation.x*true_coord_rotation.x*(1 - lens->ellipticity_potential[i])+true_coord_rotation.y*true_coord_rotation.y*(1 + lens->ellipticity_potential[i]));
//
grad.x += (1 - lens->ellipticity[i]/3.)*lens->b0[i]*true_coord_rotation.x/R;
grad.y += (1 + lens->ellipticity[i]/3.)*lens->b0[i]*true_coord_rotation.y/R;
}
return grad;
}
//
//
//
__device__ struct point module_potentialDerivatives_totalGradient_8_SOA_GPU(const struct point *pImage, const struct Potential_SOA *lens, int shalos, int nhalos)
{
//asm volatile("# module_potentialDerivatives_totalGradient_SOA begins");
// 6 DP loads, i.e. 48 Bytes: position_x, position_y, ellipticity_angle, ellipticity_potential, rcore, b0
//
struct point grad, clumpgrad;
grad.x = 0;
grad.y = 0;
//
for(int i = shalos; i < shalos + nhalos; i++)
{
//IACA_START;
//
struct point true_coord, true_coord_rot; //, result;
//double R, angular_deviation;
complex zis;
//
//result.x = result.y = 0.;
//
true_coord.x = pImage->x - lens->position_x[i];
true_coord.y = pImage->y - lens->position_y[i];
double cosi,sinu;
//cosi = cos(lens->ellipticity_angle[i]);
//sinu = sin(lens->ellipticity_angle[i]);
cosi = lens->anglecos[i];
sinu = lens->anglesin[i];
//positionning at the potential center
// Change the origin of the coordinate system to the center of the clump
//true_coord_rot = rotateCoordinateSystem_GPU(true_coord, lens->ellipticity_angle[i]);
true_coord_rot = rotateCoordinateSystem_GPU_2(true_coord, cosi,sinu);
//
double x = true_coord_rot.x;
double y = true_coord_rot.y;
double eps = lens->ellipticity_potential[i];
double rc = lens->rcore[i];
//
//std::cout << "piemd_lderivatives" << std::endl;
//
double sqe = sqrt(eps);
//
double cx1 = (1. - eps)/(1. + eps);
double cxro = (1. + eps)*(1. + eps);
double cyro = (1. - eps)*(1. - eps);
//
double rem2 = x*x/cxro + y*y/cyro;
//
complex zci, znum, zden, zres;
double norm;
//
zci.re = 0;
zci.im = -0.5*(1. - eps*eps)/sqe;
//
znum.re = cx1*x;
znum.im = 2.*sqe*sqrt(rc*rc + rem2) - y/cx1;
//
zden.re = x;
zden.im = 2.*rc*sqe - y;
norm = (zden.re*zden.re + zden.im*zden.im); // zis = znum/zden
//
zis.re = (znum.re*zden.re + znum.im*zden.im)/norm;
zis.im = (znum.im*zden.re - znum.re*zden.im)/norm;
norm = zis.re;
zis.re = log(sqrt(norm*norm + zis.im*zis.im)); // ln(zis) = ln(|zis|)+i.Arg(zis)
zis.im = atan2(zis.im, norm);
// norm = zis.re;
zres.re = zci.re*zis.re - zci.im*zis.im; // Re( zci*ln(zis) )
zres.im = zci.im*zis.re + zis.im*zci.re; // Im( zci*ln(zis) )
//
zis.re = zres.re;
zis.im = zres.im;
//
//zres.re = zis.re*b0;
//zres.im = zis.im*b0;
// rotation
clumpgrad.x = zis.re;
clumpgrad.y = zis.im;
//clumpgrad = rotateCoordinateSystem_GPU(true_coord, -lens->ellipticity_angle[i]);
clumpgrad = rotateCoordinateSystem_GPU_2(clumpgrad, cosi,-sinu);
//
clumpgrad.x = lens->b0[i]*clumpgrad.x;
clumpgrad.y = lens->b0[i]*clumpgrad.y;
//
//clumpgrad.x = lens->b0[i]*zis.re;
//clumpgrad.y = lens->b0[i]*zis.im;
//nan check
//if(clumpgrad.x == clumpgrad.x or clumpgrad.y == clumpgrad.y)
//{
// add the gradients
grad.x += clumpgrad.x;
grad.y += clumpgrad.y;
//}
}
//IACA_END;
//
return(grad);
}
__device__ struct point module_potentialDerivatives_totalGradient_81_SOA_GPU(const struct point *pImage, const struct Potential_SOA *lens, int shalos, int nhalos)
{
//asm volatile("# module_potentialDerivatives_totalGradient_SOA begins");
//std::cout << "# module_potentialDerivatives_totalGradient_SOA begins" << std::endl;
// 6 DP loads, i.e. 48 Bytes: position_x, position_y, ellipticity_angle, ellipticity_potential, rcore, b0
//
struct point grad, clumpgrad;
grad.x = 0;
grad.y = 0;
//
for(int i = shalos; i < shalos + nhalos; i++)
{
//IACA_START;
//
struct point true_coord, true_coord_rot; //, result;
//double R, angular_deviation;
complex zis;
//
//result.x = result.y = 0.;
//
true_coord.x = pImage->x - lens->position_x[i];
true_coord.y = pImage->y - lens->position_y[i];
//positionning at the potential center
// Change the origin of the coordinate system to the center of the clump
true_coord_rot = rotateCoordinateSystem_GPU(true_coord, lens->ellipticity_angle[i]);
//
double x = true_coord_rot.x;
double y = true_coord_rot.y;
double eps = lens->ellipticity_potential[i];
double rc = lens->rcore[i];
double rcut = lens->rcut[i];
double b0 = lens->b0[i];
double t05 = b0*rcut/(rcut - rc);
//printf("b0 = %f, rcut = %f, rc = %f, t05 = %f\n", b0, rcut, rc, t05);
//
//std::cout << "piemd_lderivatives" << std::endl;
//
double sqe = sqrt(eps);
//
double cx1 = (1. - eps)/(1. + eps);
double cxro = (1. + eps)*(1. + eps);
double cyro = (1. - eps)*(1. - eps);
//
double rem2 = x*x/cxro + y*y/cyro;
//
complex zci, znum, zden, zres_rc, zres_rcut;
double norm;
//
zci.re = 0;
zci.im = -0.5*(1. - eps*eps)/sqe;
//
// step 1
//
{
znum.re = cx1*x;
znum.im = 2.*sqe*sqrt(rc*rc + rem2) - y/cx1;
//
zden.re = x;
zden.im = 2.*rc*sqe - y;
norm = (zden.re*zden.re + zden.im*zden.im); // zis = znum/zden
//
zis.re = (znum.re*zden.re + znum.im*zden.im)/norm;
zis.im = (znum.im*zden.re - znum.re*zden.im)/norm;
norm = zis.re;
zis.re = log(sqrt(norm*norm + zis.im*zis.im)); // ln(zis) = ln(|zis|)+i.Arg(zis)
zis.im = atan2(zis.im, norm);
// norm = zis.re;
zres_rc.re = zci.re*zis.re - zci.im*zis.im; // Re( zci*ln(zis) )
zres_rc.im = zci.im*zis.re + zis.im*zci.re; // Im( zci*ln(zis) )
}
//
// step 2
//
{
znum.re = cx1*x;
znum.im = 2.*sqe*sqrt(rcut*rcut + rem2) - y/cx1;
//
zden.re = x;
zden.im = 2.*rcut*sqe - y;
norm = (zden.re*zden.re + zden.im*zden.im); // zis = znum/zden
//
zis.re = (znum.re*zden.re + znum.im*zden.im)/norm;
zis.im = (znum.im*zden.re - znum.re*zden.im)/norm;
norm = zis.re;
zis.re = log(sqrt(norm*norm + zis.im*zis.im)); // ln(zis) = ln(|zis|)+i.Arg(zis)
zis.im = atan2(zis.im, norm);
// norm = zis.re;
zres_rcut.re = zci.re*zis.re - zci.im*zis.im; // Re( zci*ln(zis) )
zres_rcut.im = zci.im*zis.re + zis.im*zci.re; // Im( zci*ln(zis) )
}
zis.re = t05*(zres_rc.re - zres_rcut.re);
zis.im = t05*(zres_rc.im - zres_rcut.im);
//printf("%f %f\n", zis.re, zis.im);
//
//zres.re = zis.re*b0;
//zres.im = zis.im*b0;
// rotation
clumpgrad.x = zis.re;
clumpgrad.y = zis.im;
clumpgrad = rotateCoordinateSystem_GPU(clumpgrad, -lens->ellipticity_angle[i]);
//
//clumpgrad.x = lens->b0[i]*clumpgrad.x;
//clumpgrad.y = lens->b0[i]*clumpgrad.y;
//
//clumpgrad.x = lens->b0[i]*zis.re;
//clumpgrad.y = lens->b0[i]*zis.im;
//nan check
//if(clumpgrad.x == clumpgrad.x or clumpgrad.y == clumpgrad.y)
//{
// add the gradients
grad.x += clumpgrad.x;
grad.y += clumpgrad.y;
//printf("grad = %f %f\n", clumpgrad.x, clumpgrad.y);
//}
}
//IACA_END;
//
return(grad);
}
//
//
//
typedef struct point (*halo_func_GPU_t) (const struct point *pImage, const struct Potential_SOA *lens, int shalos, int nhalos);
__constant__ halo_func_GPU_t halo_func_GPU[100] =
{
0, 0, 0, 0, 0, module_potentialDerivatives_totalGradient_5_SOA_GPU, 0, 0, module_potentialDerivatives_totalGradient_8_SOA_GPU, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, module_potentialDerivatives_totalGradient_81_SOA_GPU, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
//
//
//
__device__ struct point module_potentialDerivatives_totalGradient_SOA_GPU(const struct point *pImage, const struct Potential_SOA *lens, int nhalos)
{
struct point grad, clumpgrad;
//
grad.x = clumpgrad.x = 0;
grad.y = clumpgrad.y = 0;
//
int shalos = 0;
while (shalos < nhalos)
{
int lens_type = lens->type[shalos];
int count = 1;
while (lens->type[shalos + count] == lens_type) count++;
//std::cerr << "type = " << lens_type << " " << count << " " << shalos << std::endl;
//printf ("%d %d %d \n",lens_type,count,shalos);
//
clumpgrad = (*halo_func_GPU[lens_type])(pImage, lens, shalos, count);
//
grad.x += clumpgrad.x;
grad.y += clumpgrad.y;
shalos += count;
}
return(grad);
}
__device__ inline struct point rotateCoordinateSystem_GPU(struct point P, double theta)
{
struct point Q;
Q.x = P.x*cos(theta) + P.y*sin(theta);
Q.y = P.y*cos(theta) - P.x*sin(theta);
return(Q);
}
__device__ inline struct point rotateCoordinateSystem_GPU_2(struct point P, double cosi, double sinu)
{
struct point Q;
Q.x = P.x*cosi + P.y*sinu;
Q.y = P.y*cosi - P.x*sinu;
return(Q);
}

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