2 #![feature(repr_simd, platform_intrinsics)]
4 extern "platform-intrinsic" {
5 fn simd_shuffle<T, I, U>(a: T, b: T, i: I) -> U;
10 struct Simd<T, const N: usize>([T; N]);
12 trait Shuffle<const N: usize> {
15 unsafe fn shuffle<T, const M: usize>(&self, a: Simd<T, M>, b: Simd<T, M>) -> Simd<T, N> {
16 simd_shuffle(a, b, Self::I)
22 impl Shuffle<4> for I1 {
23 const I: [u32; 4] = [0, 2, 4, 6];
27 impl Shuffle<2> for I2 {
28 const I: [u32; 2] = [1, 5];
31 let a = Simd::<u8, 4>([0, 1, 2, 3]);
32 let b = Simd::<u8, 4>([4, 5, 6, 7]);
34 let x: Simd<u8, 4> = I1.shuffle(a, b);
35 assert_eq!(x.0, [0, 2, 4, 6]);
37 let y: Simd<u8, 2> = I2.shuffle(a, b);
38 assert_eq!(y.0, [1, 5]);