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Add test using non-power-of-two vector

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This commit is contained in:
Caleb Zulawski 2023-10-24 22:21:42 -04:00
parent 329412dad3
commit 20413b1947
1 changed files with 15 additions and 1 deletions
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16
tests/ui/simd/repr_packed.rs
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@ -6,6 +6,9 @@
#[repr(simd, packed)]
struct Simd<T, const N: usize>([T; N]);
#[repr(simd)]
struct FullSimd<T, const N: usize>([T; N]);
fn check_size_align<T, const N: usize>() {
use std::mem;
assert_eq!(mem::size_of::<Simd<T, N>>(), mem::size_of::<[T; N]>());
@ -37,9 +40,20 @@ fn main() {
unsafe {
// powers-of-two have no padding and work as usual
// non-powers-of-two have padding and need to be expanded to full vectors
let x: Simd<f64, 4> =
simd_add(Simd::<f64, 4>([0., 1., 2., 3.]), Simd::<f64, 4>([2., 2., 2., 2.]));
assert_eq!(std::mem::transmute::<_, [f64; 4]>(x), [2., 3., 4., 5.]);
// non-powers-of-two have padding and need to be expanded to full vectors
fn load<T, const N: usize>(v: Simd<T, N>) -> FullSimd<T, N> {
unsafe {
let mut tmp = core::mem::MaybeUninit::<FullSimd<T, N>>::uninit();
std::ptr::copy_nonoverlapping(&v as *const _, tmp.as_mut_ptr().cast(), 1);
tmp.assume_init()
}
}
let x: FullSimd<f64, 3> =
simd_add(load(Simd::<f64, 3>([0., 1., 2.])), load(Simd::<f64, 3>([2., 2., 2.])));
assert_eq!(x.0, [2., 3., 4.]);
}
}