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macro_rules! impl_hash {
([$elem_ty:ident; $elem_count:expr]: $id:ident | $test_tt:tt) => {
impl crate::hash::Hash for $id {
#[inline]
fn hash<H: crate::hash::Hasher>(&self, state: &mut H) {
unsafe {
union A {
data: [$elem_ty; $id::lanes()],
vec: $id,
}
A { vec: *self }.data.hash(state)
}
}
}
test_if! {
$test_tt:
paste::item! {
pub mod [<$id _hash>] {
use super::*;
#[cfg_attr(not(target_arch = "wasm32"), test)] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn hash() {
use crate::hash::{Hash, Hasher};
#[allow(deprecated)]
use crate::hash::{SipHasher13};
type A = [$elem_ty; $id::lanes()];
let a: A = [42 as $elem_ty; $id::lanes()];
assert_eq!(
crate::mem::size_of::<A>(),
crate::mem::size_of::<$id>()
);
#[allow(deprecated)]
let mut a_hash = SipHasher13::new();
let mut v_hash = a_hash.clone();
a.hash(&mut a_hash);
let v = $id::splat(42 as $elem_ty);
v.hash(&mut v_hash);
assert_eq!(a_hash.finish(), v_hash.finish());
}
}
}
}
};
}