rust/tests/ui/simd/intrinsic/inlining-issue67557.rs

// This used to cause assert_10_13 to unexpectingly fail, due to simd_shuffle_indices being passed
// the wrong Instance, causing issues with inlining. See #67557.
//
//@ run-pass
//@ compile-flags: -Zmir-opt-level=4
#![feature(intrinsics, repr_simd)]

extern "rust-intrinsic" {
    fn simd_shuffle<T, I, U>(x: T, y: T, idx: I) -> U;
}

#[repr(simd)]
#[derive(Debug, PartialEq)]
struct Simd2([u8; 2]);

#[repr(simd)]
struct SimdShuffleIdx<const LEN: usize>([u32; LEN]);

fn main() {
    unsafe {
        const IDX: SimdShuffleIdx<2> = SimdShuffleIdx([0, 1]);
        let p_res: Simd2 = simd_shuffle(Simd2([10, 11]), Simd2([12, 13]), IDX);
        let a_res: Simd2 = inline_me();

        assert_10_11(p_res);
        assert_10_13(a_res);
    }
}

#[inline(never)]
fn assert_10_11(x: Simd2) {
    assert_eq!(x, Simd2([10, 11]));
}

#[inline(never)]
fn assert_10_13(x: Simd2) {
    assert_eq!(x, Simd2([10, 13]));
}


#[inline(always)]
unsafe fn inline_me() -> Simd2 {
    const IDX: SimdShuffleIdx<2> = SimdShuffleIdx([0, 3]);
    simd_shuffle(Simd2([10, 11]), Simd2([12, 13]), IDX)
}