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#include "Halide.h"
using namespace Halide;
int run_test(Target t) {
// 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 f0{"f0_on_cpu"}, f1{"f1_on_gpu"}, f2{"f2_on_cpu"};
Var x, y, tx, ty;
// Produce something on CPU
f0(x, y) = x + y;
f0.compute_root();
// Which we use to produce something on GPU, causing a copy_to_device.
f1(x, y) = f0(x, y) + f0(x, y + 1);
f1.compute_root().gpu_tile(x, y, tx, ty, 8, 8);
// Which in turn we use to produce something on CPU, causing a copy_to_host.
f2(x, y) = f1(x, y) * 2;
f2.compute_root();
// Make the buffer a little bigger so we actually can see the copy time.
Buffer<int> out = f2.realize({2000, 2000}, t);
// Let's only verify a part of it...
for (int y = 0; y < 100; y++) {
for (int x = 0; x < 100; x++) {
int correct = 4 * (x + y) + 2;
if (out(x, y) != correct) {
printf("out(%d, %d) = %d instead of %d\n",
x, y, out(x, y), correct);
return 1;
}
}
}
return 0;
}
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;
}
printf("Testing without profiler.\n");
int result = run_test(t);
if (result != 0) {
return 1;
}
printf("Testing thread based profiler.\n");
result = run_test(t.with_feature(Target::Profile));
if (result != 0) {
return 1;
}
if (t.os == Target::Linux) {
printf("Testing timer based profiler.\n");
result = run_test(t.with_feature(Target::ProfileByTimer));
if (result != 0) {
return 1;
}
}
printf("Success!\n");
return 0;
}
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