root/test/correctness/hello_gpu.cpp

DEFINITIONS

1. main

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

using namespace Halide;

int main(int argc, char **argv) {

    Var x("x"), y("y"), xi("xi"), yi("yi");
    Func f("f");

    printf("Defining function...\n");

    f(x, y) = x*y + 2.4f;

    Target target = get_jit_target_from_environment();
    if (target.has_gpu_feature()) {
        f.gpu_tile(x, y, xi, yi, 8, 8);
    }

    printf("Realizing function...\n");

    Buffer<float> imf = f.realize(32, 32, target);

    // Check the result was what we expected
    for (int i = 0; i < 32; i++) {
        for (int j = 0; j < 32; j++) {
            float correct = i*j + 2.4f;
            if (fabs(imf(i, j) - correct) > 0.001f) {
                printf("imf[%d, %d] = %f instead of %f\n", i, j, imf(i, j), correct);
                return -1;
            }
        }
    }

    printf("Success!\n");
    return 0;
}