root/test/correctness/multipass_constraints.cpp

DEFINITIONS

1. main

#include "Halide.h"
#include <stdio.h>

using namespace Halide;

int main(int argc, char **argv) {
    ImageParam in(Float(32), 2, "in");

    Func out("out");
    Var x("x"), y("y");

    out(x, y) = in(x+1, y+1) + in(x-1, y-1);
    out(x, y) += 3.0f;
    out.update().vectorize(x, 4);

    OutputImageParam o = out.output_buffer();

    // Now make some hard-to-resolve constraints
    in.dim(0).set_bounds(in.dim(1).min() - 5, in.dim(1).extent() + o.dim(0).extent());

    o.dim(0).set_bounds(0, select(o.dim(0).extent() < 22, o.dim(0).extent() + 1, o.dim(0).extent()));

    // Make a bounds query buffer
    Buffer<float> out_buf(nullptr, 7, 8);
    out_buf.set_min(2, 2);

    out.infer_input_bounds(out_buf);

    if (in.get().dim(0).min() != -4 ||
        in.get().dim(0).extent() != 34 ||
        in.get().dim(1).min() != 1 ||
        in.get().dim(1).extent() != 10 ||
        out_buf.dim(0).min() != 0 ||
        out_buf.dim(0).extent() != 24 ||
        out_buf.dim(1).min() != 2 ||
        out_buf.dim(1).extent() != 8) {

        printf("Constraints not correctly satisfied:\n"
               "in: %d %d %d %d\n"
               "out: %d %d %d %d\n",
               in.get().dim(0).min(), in.get().dim(0).extent(),
               in.get().dim(1).min(), in.get().dim(1).extent(),
               out_buf.dim(0).min(), out_buf.dim(0).extent(),
               out_buf.dim(1).min(), out_buf.dim(1).extent());

        return -1;
    }

    return 0;
}