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#include "Halide.h"
#include "HalideBuffer.h"
using namespace Halide;
const int kEdges[3] = {128, 64, 32};
Halide::Runtime::Buffer<int32_t> make_gpu_buffer(bool hexagon_rpc) {
Var x, y, c;
Func f;
f(x, y, c) = x + y * 256 + c * 256 * 256;
if (hexagon_rpc) {
f.hexagon();
} else {
Var xi, yi;
f.gpu_tile(x, y, xi, yi, 8, 8);
}
Buffer<int32_t> result = f.realize({kEdges[0], kEdges[1], kEdges[2]});
return *result.get();
}
int main(int argc, char **argv) {
Target target = get_jit_target_from_environment();
bool hexagon_rpc = (target.arch != Target::Hexagon) &&
target.has_feature(Target::HVX);
if (!hexagon_rpc && !target.has_gpu_feature()) {
printf("[SKIP] No GPU target enabled.\n");
return 0;
}
if (target.has_feature(Target::OpenGLCompute)) {
printf("Skipping test for OpenGLCompute, as it does not support device crops, slices, or copies\n");
return 0;
}
printf("Test in-place slicing.\n");
{
Halide::Runtime::Buffer<int32_t> gpu_buf = make_gpu_buffer(hexagon_rpc);
assert(gpu_buf.raw_buffer()->device_interface != nullptr);
const int slice_dim = 1;
const int slice_pos = 0;
gpu_buf.slice(slice_dim, slice_pos);
assert(gpu_buf.raw_buffer()->device_interface != nullptr);
assert(gpu_buf.dimensions() == 2);
assert(gpu_buf.extent(0) == kEdges[0]);
assert(gpu_buf.extent(1) == kEdges[2]);
gpu_buf.copy_to_host();
gpu_buf.for_each_element([&](int x, int c) {
const int y = slice_pos;
assert(gpu_buf(x, c) == x + y * 256 + c * 256 * 256);
});
}
printf("Test nondestructive slicing.\n");
{
Halide::Runtime::Buffer<int32_t> gpu_buf = make_gpu_buffer(hexagon_rpc);
assert(gpu_buf.raw_buffer()->device_interface != nullptr);
const int slice_dim = 0;
const int slice_pos = 31;
Halide::Runtime::Buffer<int32_t> sliced = gpu_buf.sliced(slice_dim, slice_pos);
assert(sliced.raw_buffer()->device_interface != nullptr);
assert(sliced.dimensions() == 2);
assert(sliced.extent(0) == kEdges[1]);
assert(sliced.extent(1) == kEdges[2]);
sliced.copy_to_host();
sliced.for_each_element([&](int y, int c) {
const int x = slice_pos;
assert(sliced(y, c) == x + y * 256 + c * 256 * 256);
});
gpu_buf.copy_to_host();
gpu_buf.for_each_element([&](int x, int y, int c) {
assert(gpu_buf(x, y, c) == x + y * 256 + c * 256 * 256);
});
}
printf("Test slice of a slice\n");
{
Halide::Runtime::Buffer<int32_t> gpu_buf = make_gpu_buffer(hexagon_rpc);
assert(gpu_buf.raw_buffer()->device_interface != nullptr);
const int slice_dim = 1;
const int slice_pos = 0;
Halide::Runtime::Buffer<int32_t> sliced = gpu_buf.sliced(slice_dim, slice_pos);
assert(sliced.raw_buffer()->device_interface != nullptr);
assert(sliced.dimensions() == 2);
assert(sliced.extent(0) == kEdges[0]);
assert(sliced.extent(1) == kEdges[2]);
const int slice_dim2 = 0;
const int slice_pos2 = 10;
Halide::Runtime::Buffer<int32_t> sliced2 = sliced.sliced(slice_dim2, slice_pos2);
assert(sliced2.raw_buffer()->device_interface != nullptr);
assert(sliced2.dimensions() == 1);
assert(sliced2.extent(0) == kEdges[2]);
sliced.copy_to_host();
sliced.for_each_element([&](int x, int c) {
const int y = slice_pos;
assert(sliced(x, c) == x + y * 256 + c * 256 * 256);
});
sliced2.copy_to_host();
sliced2.for_each_element([&](int c) {
const int x = slice_pos2;
const int y = slice_pos;
assert(sliced2(c) == x + y * 256 + c * 256 * 256);
});
gpu_buf.copy_to_host();
gpu_buf.for_each_element([&](int x, int y, int c) {
assert(gpu_buf(x, y, c) == x + y * 256 + c * 256 * 256);
});
}
printf("Test parent going out of scope before slice.\n");
{
Halide::Runtime::Buffer<int32_t> sliced;
const int slice_dim = 1;
const int slice_pos = 0;
{
Halide::Runtime::Buffer<int32_t> gpu_buf = make_gpu_buffer(hexagon_rpc);
assert(gpu_buf.raw_buffer()->device_interface != nullptr);
sliced = gpu_buf.sliced(slice_dim, slice_pos);
assert(sliced.raw_buffer()->device_interface != nullptr);
}
assert(sliced.dimensions() == 2);
assert(sliced.extent(0) == kEdges[0]);
assert(sliced.extent(1) == kEdges[2]);
sliced.copy_to_host();
sliced.for_each_element([&](int x, int c) {
const int y = slice_pos;
assert(sliced(x, c) == x + y * 256 + c * 256 * 256);
});
}
printf("Test realizing to/from slice.\n");
{
ImageParam in(Int(32), 2);
Var x, y;
Func f;
f(x, y) = in(x, y) + 42;
Var xi, yi;
if (hexagon_rpc) {
f.hexagon();
} else {
f.gpu_tile(x, y, xi, yi, 8, 8);
}
Halide::Buffer<int32_t> gpu_input = make_gpu_buffer(hexagon_rpc);
Halide::Buffer<int32_t> gpu_output = make_gpu_buffer(hexagon_rpc);
const int slice_dim = 1;
const int slice_pos = 0;
gpu_input.slice(slice_dim, slice_pos);
gpu_output.slice(slice_dim, slice_pos);
in.set(gpu_input);
f.realize(gpu_output, target);
gpu_output.copy_to_host();
gpu_output.copy_to_host();
gpu_output.for_each_element([&](int x, int c) {
const int y = slice_pos;
assert(gpu_output(x, c) == x + y * 256 + c * 256 * 256 + 42);
});
}
printf("Success!\n");
return 0;
}
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