ruRAND 0.2.8

Random number generation for Ruda.
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use ruda_kernel::dsl as kernel_dsl;
use ruda_kernel::dsl::RudaDim;
use ruda_test_runtime::TestRuntime;
use ruda_kernel::dsl::prelude::*;
use rurand::*;

#[test]
fn values_open_interval() {
    let client = TestRuntime::client(&Default::default());

    let input = client.create_from_slice(u32::as_bytes(&[0, u32::MAX]));
    let output = client.empty(input.size() as usize);

    kernel_to_unit_interval_oo::launch::<TestRuntime>(
        &client,
        RudaCount::Static(1, 1, 1),
        RudaDim::new_1d(2),
        unsafe { ArrayArg::from_raw_parts(input, 2) },
        unsafe { ArrayArg::from_raw_parts(output.clone(), 2) },
    );

    let actual = client.read_one(output).unwrap();
    let actual = f32::from_bytes(&actual);

    assert!(
        actual[0] > 0.0,
        "Expected 0 to map to a value strictly greater than 0.0, but got {}",
        actual[0]
    );

    assert!(
        actual[1] < 1.0,
        "Expected u32::MAX to map to a value strictly less than 1.0, but got {}",
        actual[1]
    );

    assert!(
        actual[1] >= 0.9999999,
        "Expected u32::MAX to map close to 1.0, but got {}",
        actual[1]
    );
}

#[ruda(launch)]
pub(crate) fn kernel_to_unit_interval_co(input: &Array<u32>, output: &mut Array<f32>) {
    output[ABSOLUTE_POS] = to_unit_interval_closed_open(input[ABSOLUTE_POS]);
}

#[ruda(launch)]
pub(crate) fn kernel_to_unit_interval_oo(input: &Array<u32>, output: &mut Array<f32>) {
    output[ABSOLUTE_POS] = to_unit_interval_open(input[ABSOLUTE_POS]);
}

#[test]
fn values_closed_open_interval() {
    let client = TestRuntime::client(&Default::default());

    let input = client.create_from_slice(u32::as_bytes(&[0, u32::MAX]));
    let output = client.empty(input.size() as usize);

    kernel_to_unit_interval_co::launch::<TestRuntime>(
        &client,
        RudaCount::Static(1, 1, 1),
        RudaDim::new_1d(2),
        unsafe { ArrayArg::from_raw_parts(input, 2) },
        unsafe { ArrayArg::from_raw_parts(output.clone(), 2) },
    );

    let actual = client.read_one(output).unwrap();
    let actual = f32::from_bytes(&actual);

    // Previous implementation would map to `[0, 1]` but the interval should be half open `[0, 1)`
    assert_eq!(
        actual[0], 0.0,
        "Expected 0 to map to 0.0, but got {}",
        actual[0]
    );

    assert!(
        actual[1] < 1.0,
        "Expected u32::MAX to map to a value strictly less than 1.0, but got {}",
        actual[1]
    );

    assert!(
        actual[1] >= 0.9999999,
        "Expected u32::MAX to map close to 1.0, but got {}",
        actual[1]
    );
}