#include <stdio.h>
#include <math.h>
#include <cstdlib>
static void fn()
{
}
int main(int argc, char ** argv)
{
    try {
        int device = argc > 1 ? atoi(argv[1]) : 0;
        printf("Benchmark N-by-N 2D fft\n");
        for (int M = 7; M <= 12; M++) {
            int N = (1 << M);
            printf("%4d x %4d: ", N, N);
            double gflops = 10.0 * N * N * M / (time * 1e9);
            printf(" %4.0f Gflops\n", gflops);
            fflush(stdout);
        }
        fprintf(stderr, 
"%s\n", e.
what());
    }
    return 0;
}