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#include "Halide.h"
using namespace Halide;
int main(int argc, char **argv) {
Target t = get_jit_target_from_environment();
if (!t.has_gpu_feature()) {
printf("[SKIP] no gpu feature enabled\n");
return 0;
}
// Sliding window with the producer on the GPU and the consumer on
// the CPU. This requires a copy inside the loop over which we are
// sliding. Currently this copies the entire buffer back and
// forth, which is suboptimal in the general case. In this
// specific case we're folded over y, so copying the entire buffer
// is not much more than just copying the part that was modified.
Func f, g;
Var x, y;
f(x, y) = x + y;
g(x, y) = f(x, y) + f(x, y + 1);
Var xi, yi;
f.store_root()
.compute_at(g, y)
.gpu_tile(x, xi, 32);
Buffer<int> out = g.realize({100, 100});
for (int y = 0; y < 100; y++) {
for (int x = 0; x < 100; x++) {
int correct = 2 * (x + y) + 1;
if (out(x, y) != correct) {
printf("out(%d, %d) = %d instead of %d\n",
x, y, out(x, y), correct);
return 1;
}
}
}
printf("Success!\n");
return 0;
}
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