Revision caa3ad0e5a590d2b1ad6f2ca33caa5438fe98d99 authored by Volodymyr Kysenko on 24 February 2022, 01:09:55 UTC, committed by GitHub on 24 February 2022, 01:09:55 UTC
1 parent b2edbc9
gaussian5x5_generator.cpp
#include "Halide.h"
using namespace Halide;
class Gaussian5x5 : public Generator<Gaussian5x5> {
public:
Input<Buffer<uint8_t, 2>> input{"input"};
Output<Buffer<uint8_t, 2>> output{"output"};
GeneratorParam<bool> use_parallel_sched{"use_parallel_sched", true};
GeneratorParam<bool> use_prefetch_sched{"use_prefetch_sched", true};
void generate() {
bounded_input(x, y) = BoundaryConditions::repeat_edge(input)(x, y);
Func input_16("input_16");
input_16(x, y) = cast<int16_t>(bounded_input(x, y));
rows(x, y) = input_16(x, y - 2) + 4 * input_16(x, y - 1) + 6 * input_16(x, y) + 4 * input_16(x, y + 1) + input_16(x, y + 2);
cols(x, y) = rows(x - 2, y) + 4 * rows(x - 1, y) + 6 * rows(x, y) + 4 * rows(x + 1, y) + rows(x + 2, y);
output(x, y) = cast<uint8_t>(cols(x, y) >> 8);
}
void schedule() {
Var xi{"xi"}, yi{"yi"};
input.dim(0).set_min(0);
input.dim(1).set_min(0);
output.dim(0).set_min(0);
output.dim(1).set_min(0);
if (get_target().has_feature(Target::HVX)) {
const int vector_size = 128;
Expr input_stride = input.dim(1).stride();
input.dim(1).set_stride((input_stride / vector_size) * vector_size);
Expr output_stride = output.dim(1).stride();
bounded_input
.compute_at(Func(output), y)
.align_storage(x, 128)
.vectorize(x, vector_size, TailStrategy::RoundUp);
output.dim(1).set_stride((output_stride / vector_size) * vector_size);
output
.hexagon()
.tile(x, y, xi, yi, vector_size * 2, 4, TailStrategy::RoundUp)
.vectorize(xi)
.unroll(yi);
rows.compute_at(Func(output), y)
.tile(x, y, x, y, xi, yi, vector_size, 4, TailStrategy::RoundUp)
.vectorize(xi)
.unroll(yi);
if (use_prefetch_sched) {
output.prefetch(input, y, y, 2);
}
if (use_parallel_sched) {
Var yo;
output.split(y, yo, y, 128).parallel(yo);
}
} else {
const int vector_size = natural_vector_size<uint8_t>();
output
.vectorize(x, vector_size)
.parallel(y, 16);
}
}
private:
Func rows{"rows"}, cols{"cols"}, bounded_input{"bounded_input"};
Var x{"x"}, y{"y"};
};
HALIDE_REGISTER_GENERATOR(Gaussian5x5, gaussian5x5)
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