tests/ui/simd/intrinsic/generic-bitmask-pass.rs

//@ run-pass
#![allow(non_camel_case_types)]

//@ ignore-emscripten
//@ ignore-endian-big behavior of simd_bitmask is endian-specific

// Test that the simd_bitmask intrinsic produces correct results.

#![feature(repr_simd, intrinsics)]
#[allow(non_camel_case_types)]

#[repr(simd)]
#[derive(Copy, Clone, PartialEq, Debug)]
struct u32x4(pub [u32; 4]);

#[repr(simd)]
#[derive(Copy, Clone, PartialEq, Debug)]
struct u8x4(pub [u8; 4]);

#[repr(simd)]
#[derive(Copy, Clone, PartialEq, Debug)]
struct Tx4<T>(pub [T; 4]);

extern "rust-intrinsic" {
    fn simd_bitmask<T, U>(x: T) -> U;
}

fn main() {
    let z = u32x4([0, 0, 0, 0]);
    let ez = 0_u8;

    let o = u32x4([!0, !0, !0, !0]);
    let eo = 0b_1111_u8;

    let m0 = u32x4([!0, 0, !0, 0]);
    let e0 = 0b_0000_0101_u8;

    // Check that the MSB is extracted:
    let m = u8x4([0b_1000_0000, 0b_0100_0001, 0b_1100_0001, 0b_1111_1111]);
    let e = 0b_1101;

    // Check usize / isize
    let msize: Tx4<usize> = Tx4([usize::MAX, 0, usize::MAX, usize::MAX]);

    unsafe {
        let r: u8 = simd_bitmask(z);
        assert_eq!(r, ez);

        let r: u8 = simd_bitmask(o);
        assert_eq!(r, eo);

        let r: u8 = simd_bitmask(m0);
        assert_eq!(r, e0);

        let r: u8 = simd_bitmask(m);
        assert_eq!(r, e);

        let r: u8 = simd_bitmask(msize);
        assert_eq!(r, e);

    }
}