41 lines
877 B
Rust
41 lines
877 B
Rust
|
//run-pass
|
||
|
|
#![feature(repr_simd, platform_intrinsics)]
|
||
|
|
|
||
|
|
extern "platform-intrinsic" {
|
||
|
|
fn simd_shuffle<T, I, U>(a: T, b: T, i: I) -> U;
|
||
|
|
}
|
||
|
|
|
||
|
|
#[derive(Copy, Clone)]
|
||
|
|
#[repr(simd)]
|
||
|
|
struct Simd<T, const N: usize>([T; N]);
|
||
|
|
|
||
|
|
trait Shuffle<const N: usize> {
|
||
|
|
const I: [u32; N];
|
||
|
|
|
||
|
|
unsafe fn shuffle<T, const M: usize>(&self, a: Simd<T, M>, b: Simd<T, M>) -> Simd<T, N> {
|
||
|
|
simd_shuffle(a, b, Self::I)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
struct I1;
|
||
|
|
impl Shuffle<4> for I1 {
|
||
|
|
const I: [u32; 4] = [0, 2, 4, 6];
|
||
|
|
}
|
||
|
|
|
||
|
|
struct I2;
|
||
|
|
impl Shuffle<2> for I2 {
|
||
|
|
const I: [u32; 2] = [1, 5];
|
||
|
|
}
|
||
|
|
|
||
|
|
let a = Simd::<u8, 4>([0, 1, 2, 3]);
|
||
|
|
let b = Simd::<u8, 4>([4, 5, 6, 7]);
|
||
|
|
unsafe {
|
||
|
|
let x: Simd<u8, 4> = I1.shuffle(a, b);
|
||
|
|
assert_eq!(x.0, [0, 2, 4, 6]);
|
||
|
|
|
||
|
|
let y: Simd<u8, 2> = I2.shuffle(a, b);
|
||
|
|
assert_eq!(y.0, [1, 5]);
|
||
|
|
}
|
||
|
|
}
|