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#include "Halide.h"
#include <stdio.h>
using namespace Halide;
#ifdef _WIN32
#define DLLEXPORT __declspec(dllexport)
#else
#define DLLEXPORT
#endif
int call_count;
extern "C" DLLEXPORT float call_counter(float x) {
call_count++;
return x;
}
HalidePureExtern_1(float, call_counter, float);
int main(int argc, char **argv) {
Func f;
Var x, y;
f(x, y) = call_counter(sin(x * 3 + y));
// f contains values in [-1, 1]. Now compute a convolution over f
// only where f is positive. If f is negative, we'll skip the work
// and write a zero instead.
Func blur;
RDom r(-10, 20, -10, 20);
blur(x, y) = select(f(x, y) > 0, sum(f(x + r.x, y + r.y)), 0);
call_count = 0;
blur.realize({100, 100});
// If we computed the convolution everywhere, call_count would be
// 100*100*20*20. Because we only compute it in half of the
// places, it should be smaller; roughly 100*100*20*20*0.5.
if (call_count > 2100000) {
printf("Expected call_count ~= 2000000. Instead it's %d\n", call_count);
return -1;
}
printf("Success!\n");
return 0;
}
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