mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-25 08:13:41 +00:00
40 lines
917 B
Rust
40 lines
917 B
Rust
// Figuring out the size of a vector type that depends on traits doesn't ICE
|
|
|
|
#![allow(dead_code)]
|
|
|
|
//@ pretty-expanded FIXME #23616
|
|
|
|
#![feature(repr_simd, intrinsics, generic_const_exprs)]
|
|
#![allow(non_camel_case_types, incomplete_features)]
|
|
|
|
pub trait Simd {
|
|
type Lane: Clone + Copy;
|
|
const SIZE: usize;
|
|
}
|
|
|
|
pub struct i32x4;
|
|
impl Simd for i32x4 {
|
|
type Lane = i32;
|
|
const SIZE: usize = 4;
|
|
}
|
|
|
|
#[repr(simd)]
|
|
#[derive(Copy, Clone)]
|
|
pub struct T<S: Simd>([S::Lane; S::SIZE]);
|
|
//~^ ERROR unconstrained generic constant
|
|
//~| ERROR SIMD vector element type should be a primitive scalar
|
|
//~| ERROR unconstrained generic constant
|
|
|
|
extern "rust-intrinsic" {
|
|
fn simd_insert<T, E>(x: T, idx: u32, y: E) -> T;
|
|
fn simd_extract<T, E>(x: T, idx: u32) -> E;
|
|
}
|
|
|
|
pub fn main() {
|
|
let mut t = T::<i32x4>([0; 4]);
|
|
unsafe {
|
|
t = simd_insert(t, 3, 3);
|
|
assert_eq!(3, simd_extract(t, 3));
|
|
}
|
|
}
|