mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-25 16:24:46 +00:00
46 lines
1.4 KiB
Rust
46 lines
1.4 KiB
Rust
// run-pass
|
|
// revisions: opt noopt
|
|
//[noopt] compile-flags: -Copt-level=0
|
|
//[opt] compile-flags: -O
|
|
#![feature(repr_simd, platform_intrinsics)]
|
|
#![allow(incomplete_features)]
|
|
#![feature(adt_const_params)]
|
|
|
|
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]);
|
|
|
|
pub unsafe fn __shuffle_vector16<const IDX: [u32; 16], T, U>(x: T, y: T) -> U {
|
|
simd_shuffle(x, y, IDX)
|
|
}
|
|
|
|
fn main() {
|
|
const I1: [u32; 4] = [0, 2, 4, 6];
|
|
const I2: [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> = simd_shuffle(a, b, I1);
|
|
assert_eq!(x.0, [0, 2, 4, 6]);
|
|
|
|
let y: Simd<u8, 2> = simd_shuffle(a, b, I2);
|
|
assert_eq!(y.0, [1, 5]);
|
|
}
|
|
// Test that an indirection (via an unnamed constant)
|
|
// through a const generic parameter also works.
|
|
// See https://github.com/rust-lang/rust/issues/113500 for details.
|
|
let a = Simd::<u8, 16>([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]);
|
|
let b = Simd::<u8, 16>([16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31]);
|
|
unsafe {
|
|
__shuffle_vector16::<
|
|
{ [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16] },
|
|
Simd<u8, 16>,
|
|
Simd<u8, 16>,
|
|
>(a, b);
|
|
}
|
|
}
|