mirror of https://github.com/rust-lang/rust
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
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#![allow(dead_code)]
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//@ pretty-expanded FIXME #23616
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#![feature(repr_simd, intrinsics, generic_const_exprs)]
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#![allow(non_camel_case_types, incomplete_features)]
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pub trait Simd {
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type Lane: Clone + Copy;
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const SIZE: usize;
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}
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pub struct i32x4;
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impl Simd for i32x4 {
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type Lane = i32;
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const SIZE: usize = 4;
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}
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#[repr(simd)]
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#[derive(Copy, Clone)]
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pub struct T<S: Simd>([S::Lane; S::SIZE]);
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//~^ ERROR unconstrained generic constant
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//~| ERROR SIMD vector element type should be a primitive scalar
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//~| ERROR unconstrained generic constant
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extern "rust-intrinsic" {
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fn simd_insert<T, E>(x: T, idx: u32, y: E) -> T;
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fn simd_extract<T, E>(x: T, idx: u32) -> E;
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}
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pub fn main() {
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let mut t = T::<i32x4>([0; 4]);
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unsafe {
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t = simd_insert(t, 3, 3);
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assert_eq!(3, simd_extract(t, 3));
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}
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}
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