diff options
Diffstat (limited to 'third_party/rust/packed_simd/src/api/from/from_array.rs')
| -rw-r--r-- | third_party/rust/packed_simd/src/api/from/from_array.rs | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/third_party/rust/packed_simd/src/api/from/from_array.rs b/third_party/rust/packed_simd/src/api/from/from_array.rs deleted file mode 100644 index 5c7801ddaf..0000000000 --- a/third_party/rust/packed_simd/src/api/from/from_array.rs +++ /dev/null @@ -1,124 +0,0 @@ -//! Implements `From<[T; N]>` and `Into<[T; N]>` for vector types. - -macro_rules! impl_from_array { - ([$elem_ty:ident; $elem_count:expr]: $id:ident | $test_tt:tt - | ($non_default_array:expr, $non_default_vec:expr)) => { - impl From<[$elem_ty; $elem_count]> for $id { - #[inline] - fn from(array: [$elem_ty; $elem_count]) -> Self { - union U { - array: [$elem_ty; $elem_count], - vec: $id, - } - unsafe { U { array }.vec } - } - } - - impl From<$id> for [$elem_ty; $elem_count] { - #[inline] - fn from(vec: $id) -> Self { - union U { - array: [$elem_ty; $elem_count], - vec: $id, - } - unsafe { U { vec }.array } - } - } - - // FIXME: `Into::into` is not inline, but due to - // the blanket impl in `std`, which is not - // marked `default`, we cannot override it here with - // specialization. - /* - impl Into<[$elem_ty; $elem_count]> for $id { - #[inline] - fn into(self) -> [$elem_ty; $elem_count] { - union U { - array: [$elem_ty; $elem_count], - vec: $id, - } - unsafe { U { vec: self }.array } - } - } - - impl Into<$id> for [$elem_ty; $elem_count] { - #[inline] - fn into(self) -> $id { - union U { - array: [$elem_ty; $elem_count], - vec: $id, - } - unsafe { U { array: self }.vec } - } - } - */ - - test_if! { - $test_tt: - paste::item! { - // Comparisons use integer casts within mantissa^1 range. - #[allow(clippy::float_cmp)] - mod [<$id _from>] { - use super::*; - #[test] - #[cfg_attr(miri, ignore)] - fn array() { - let vec: $id = Default::default(); - - // FIXME: Workaround for arrays with more than 32 - // elements. - // - // Safe because we never take a reference to any - // uninitialized element. - union W { - array: [$elem_ty; $elem_count], - other: () - } - let mut array = W { other: () }; - for i in 0..$elem_count { - let default: $elem_ty = Default::default(); - // note: array.other is the active member and - // initialized so we can take a reference to it: - let p = unsafe { - &mut array.other as *mut () as *mut $elem_ty - }; - // note: default is a valid bit-pattern for - // $elem_ty: - unsafe { - crate::ptr::write(p.wrapping_add(i), default) - }; - } - // note: the array variant of the union is properly - // initialized: - let mut array = unsafe { - array.array - }; - - array[0] = $non_default_array; - let vec = vec.replace(0, $non_default_vec); - - let vec_from_array = $id::from(array); - assert_eq!(vec_from_array, vec); - let array_from_vec - = <[$elem_ty; $elem_count]>::from(vec); - // FIXME: Workaround for arrays with more than 32 - // elements. - for i in 0..$elem_count { - assert_eq!(array_from_vec[i], array[i]); - } - - let vec_from_into_array: $id = array.into(); - assert_eq!(vec_from_into_array, vec); - let array_from_into_vec: [$elem_ty; $elem_count] - = vec.into(); - // FIXME: Workaround for arrays with more than 32 - // elements. - for i in 0..$elem_count { - assert_eq!(array_from_into_vec[i], array[i]); - } - } - } - } - } - }; -} |