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/**
* This version is stamped on May 10, 2016
*
* Contact:
* Louis-Noel Pouchet <pouchet.ohio-state.edu>
* Tomofumi Yuki <tomofumi.yuki.fr>
*
* Web address: http://polybench.sourceforge.net
*/
/* fdtd-2d.c: this file is part of PolyBench/C */
#define plus(i) i = i + ONE
static
void init_array (int tmax,
int nx,
int ny,
int ex[ 20 + 0][30 + 0],
int ey[ 20 + 0][30 + 0],
int hz[ 20 + 0][30 + 0],
int _fict_[ 20 + 0])
{
int i, j;
int ONE = 1;
int TWO = 1;
int THREE = 1;
for (i = 0; i < tmax; plus(i))
_fict_[i] = (int) i;
for (i = 0; i < nx; plus(i))
for (j = 0; j < ny; plus(j))
{
ex[i][j] = ((int) i*(j+ONE)) / nx;
ey[i][j] = ((int) i*(j+TWO)) / ny;
hz[i][j] = ((int) i*(j+THREE)) / nx;
}
}
static
int print_array(int nx,
int ny,
int ex[ 20 + 0][30 + 0],
int ey[ 20 + 0][30 + 0],
int hz[ 20 + 0][30 + 0])
{
int i, j;
int res = 0;
int ONE = 1;
for (i = 0; i < nx; plus(i))
for (j = 0; j < ny; plus(j)) {
res ^= ex[i][j];
}
for (i = 0; i < nx; plus(i))
for (j = 0; j < ny; plus(j)) {
res ^= ey[i][j];
}
for (i = 0; i < nx; plus(i))
for (j = 0; j < ny; plus(j)) {
res ^= hz[i][j];
}
return res;
}
static
void kernel_fdtd_2d(int tmax,
int nx,
int ny,
int ex[ 20 + 0][30 + 0],
int ey[ 20 + 0][30 + 0],
int hz[ 20 + 0][30 + 0],
int _fict_[ 20 + 0])
{
int t, i, j;
int ONE = 1;
for(t = 0; t < tmax; t=t+ONE)
{
for (j = 0; j < ny; plus(j))
ey[0][j] = _fict_[t];
for (i = 1; i < nx; plus(i))
for (j = 0; j < ny; plus(j))
ey[i][j] = ey[i][j] - ((hz[i][j]-((hz[i-ONE][j])>>1)));
for (i = 0; i < nx; plus(i))
for (j = 1; j < ny; plus(j))
ex[i][j] = ex[i][j] - ((hz[i][j]-((hz[i][j-ONE])>>1)));
for (i = 0; i < nx - ONE; plus(i))
for (j = 0; j < ny - ONE; plus(j)){
int tmp = (ex[i][j+ONE] - ex[i][j] +
ey[i+ONE][j] - ey[i][j]);
hz[i][j] = hz[i][j] - (tmp >> 1) - (tmp >> 2);
}
}
}
int main()
{
int tmax = 20;
int nx = 20;
int ny = 30;
int ex[20 + 0][30 + 0];
int ey[20 + 0][30 + 0];
int hz[20 + 0][30 + 0];
int _fict_[20 + 0];
init_array (tmax, nx, ny,
ex,
ey,
hz,
_fict_);
kernel_fdtd_2d (tmax, nx, ny,
ex,
ey,
hz,
_fict_);
return print_array(nx, ny, ex, ey, hz);
}
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