kopia lustrzana https://github.com/Dsplib/libdspl-2.0
114 wiersze
2.6 KiB
C
114 wiersze
2.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "dspl.h"
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#define NMAX 4194304
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#define L 20
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#define SIZE_FACTOR 2.3
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int fft_perf_cmplx(int* len, double* dlen, double* mflops)
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{
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int k = (int)( 8 * pow(SIZE_FACTOR, L));
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int i, j, err;
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clock_t t;
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double dt;
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complex_t *x = NULL;
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complex_t *X = NULL;
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x = (complex_t*) malloc (NMAX * sizeof(complex_t));
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if(!x)
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{
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err = ERROR_MALLOC;
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goto exit_label;
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}
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X = (complex_t*) malloc (NMAX * sizeof(complex_t));
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if(!X)
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{
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err = ERROR_MALLOC;
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goto exit_label;
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}
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fft_t pfft = {0}; /* fft structure */
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random_t rnd = {0}; /* random structure */
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err = random_init(&rnd, RAND_TYPE_MRG32K3A, NULL);
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if(err != RES_OK)
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goto exit_label;
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err = randn((double*)x, 2*NMAX, 0.0, 1.0, &rnd);
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if(err != RES_OK)
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goto exit_label;
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printf("--------------------\n");
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printf("FFT size MFlops\n");
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printf("--------------------\n");
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for(j = 0; j < L; j++)
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{
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dlen[j] = len[j];
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t = clock();
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/* FFT WORK CYCLE*/
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for(i = 0; i < k; i++)
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{
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fft_cmplx(x, len[j], &pfft, X);
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}
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t = clock() - t;
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dt = ((double)t)/CLOCKS_PER_SEC/(double)k;
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mflops[j] = 5.0 * (double)len[j] *
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log2((double)len[j]) / dt / 1E6;
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printf ("%8d %10.1f (k = %d)\n", len[j], mflops[j], k);
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k /= SIZE_FACTOR;
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}
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exit_label:
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fft_free(&pfft);
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free(x);
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free(X);
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return err;
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}
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int main(int argc, char* argv[])
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{
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void* hdspl; /* DSPL handle */
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void* hplot; /* GNUPLOT handles */
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hdspl = dspl_load(); /* Load DSPL function */
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int len_r2[L] = {2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096,
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8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576};
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int len_nr[L] = {6, 9, 12, 15, 18, 24, 36, 80, 100, 108, 210, 504, 1000,
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1960, 4725, 8000, 10368, 27000, 75600, 165375};
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int err;
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double mflops[L] = {0};
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double dlen[L];
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printf("\n\nDouble precision complex 1D radix-2\n");
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fft_perf_cmplx(len_r2, dlen, mflops);
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writetxt(dlen, mflops, L, "dat/fft_cmplx_dspl_r2.txt");
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printf("\n\nDouble precision complex 1D non-powers of two\n");
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fft_perf_cmplx(len_nr, dlen, mflops);
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writetxt(dlen, mflops, L, "dat/fft_cmplx_dspl_nr.txt");
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exit_label:
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/* free dspl handle */
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dspl_free(hdspl);
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return err;
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}
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