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#include "Halide.h"
#include "halide_test_dirs.h"
#include <cstdio>
using namespace Halide;
extern "C" HALIDE_EXPORT_SYMBOL int copy_row_plus_xcoord(halide_buffer_t *input, halide_buffer_t *output) {
// Note the final output buffer argument is unused.
if (input->is_bounds_query()) {
for (int d = 0; d < 2; d++) {
// Request some range of the input buffer
input->dim[d].min = output->dim[d].min;
input->dim[d].extent = output->dim[d].extent;
}
} else if (!output->is_bounds_query()) {
int min_x = output->dim[0].min;
int max_x = min_x + output->dim[0].extent - 1;
int min_y = output->dim[1].min;
int max_y = min_y + output->dim[1].extent - 1;
// One of the dimensions should have extent 1.
assert(output->dim[0].extent == 1 || output->dim[1].extent == 1);
for (int y = min_y; y <= max_y; y++) {
for (int x = min_x; x <= max_x; x++) {
int coords[2] = {x, y};
*(int *)output->address_of(coords) = *(int *)input->address_of(coords) + x;
}
}
}
return 0;
}
int main(int argc, char **argv) {
// Try making only one of each dimension of a 2D extern stage extern.
for (int extern_dim = 0; extern_dim < 2; extern_dim++) {
Func input;
Var x, y;
input(x, y) = x * y;
Func output;
output.define_extern("copy_row_plus_xcoord", {input}, Int(32), {x, y});
if (extern_dim == 0) {
output.compute_root().reorder(y, x).serial(x); // Change loop from extern to serial.
input.compute_at(output, x);
} else {
output.compute_root().serial(y); // Change loop from extern to serial.
input.compute_at(output, y);
}
Buffer<int32_t> buf = output.realize({100, 100});
for (int y = 0; y < buf.height(); y++) {
for (int x = 0; x < buf.width(); x++) {
assert(buf(x, y) == x * y + x);
}
}
}
printf("Success!\n");
return 0;
}
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