# Struct v128

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    #[repr(simd)]pub struct v128(/* private fields */);

🔬This is a nightly-only experimental API. (`simd_wasm64` #90599)
Available on WebAssembly and `target_family="wasm"` only.
Expand description

WASM-specific 128-bit wide SIMD vector type.

This type corresponds to the `v128` type in the WebAssembly SIMD proposal. This type is 128-bits large and the meaning of all the bits is defined within the context of how this value is used.

This same type is used simultaneously for all 128-bit-wide SIMD types, for example:

- sixteen 8-bit integers (both `i8` and `u8`)
- eight 16-bit integers (both `i16` and `u16`)
- four 32-bit integers (both `i32` and `u32`)
- two 64-bit integers (both `i64` and `u64`)
- four 32-bit floats (`f32`)
- two 64-bit floats (`f64`)

The `v128` type in Rust is intended to be quite analogous to the `v128` type in WebAssembly. Operations on `v128` can only be performed with the functions in this module.

## Trait Implementations§

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### impl Clone for v128

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#### fn clone(&self) -> v128

Returns a duplicate of the value. Read more
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#### fn clone_from(&mut self, source: &Self)
where Self:,

Performs copy-assignment from `source`. Read more
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### impl Debug for v128

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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### impl Copy for v128

## Auto Trait Implementations§

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### impl Freeze for v128

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### impl RefUnwindSafe for v128

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### impl Send for v128

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### impl Sync for v128

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### impl Unpin for v128

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### impl UnwindSafe for v128

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit` #126799)
Performs copy-assignment from `self` to `dest`. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.