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annotate src/fftw-3.3.5/libbench2/mflops.c @ 42:2cd0e3b3e1fd

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Current fftw source
author Chris Cannam
date Tue, 18 Oct 2016 13:40:26 +0100
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Chris@42 1 /* not worth copyrighting */
Chris@42 2
Chris@42 3 #include "bench.h"
Chris@42 4 #include <math.h>
Chris@42 5
Chris@42 6 double mflops(const bench_problem *p, double t)
Chris@42 7 {
Chris@42 8 int size = tensor_sz(p->sz);
Chris@42 9 int vsize = tensor_sz(p->vecsz);
Chris@42 10
Chris@42 11 if (size <= 1) /* a copy: just return reals copied / time */
Chris@42 12 switch (p->kind) {
Chris@42 13 case PROBLEM_COMPLEX:
Chris@42 14 return (2.0 * size * vsize / (t * 1.0e6));
Chris@42 15 case PROBLEM_REAL:
Chris@42 16 case PROBLEM_R2R:
Chris@42 17 return (1.0 * size * vsize / (t * 1.0e6));
Chris@42 18 }
Chris@42 19
Chris@42 20 switch (p->kind) {
Chris@42 21 case PROBLEM_COMPLEX:
Chris@42 22 return (5.0 * size * vsize * log((double)size) /
Chris@42 23 (log(2.0) * t * 1.0e6));
Chris@42 24 case PROBLEM_REAL:
Chris@42 25 case PROBLEM_R2R:
Chris@42 26 return (2.5 * vsize * size * log((double) size) /
Chris@42 27 (log(2.0) * t * 1.0e6));
Chris@42 28 }
Chris@42 29 BENCH_ASSERT(0 /* can't happen */);
Chris@42 30 return 0.0;
Chris@42 31 }
Chris@42 32