# Struct __m128d

1.27.0 · Source

    #[repr(simd)]pub struct __m128d(/* private fields */);

Available on x86 and (x86 or x86-64) only.
Expand description

128-bit wide set of two `f64` types, x86-specific

This type is the same as the `__m128d` type defined by Intel, representing a 128-bit SIMD register which internally is consisted of two packed `f64` instances. Usage of this type typically corresponds to the `sse` and up target features for x86/x86_64.

Note that unlike `__m128i`, the integer version of the 128-bit registers, this `__m128d` type has one interpretation. Each instance of `__m128d` always corresponds to `f64x2`, or two `f64` types packed together.

The in-memory representation of this type is the same as the one of an equivalent array (i.e. the in-memory order of elements is the same, and there is no padding); however, the alignment is different and equal to the size of the type. Note that the ABI for function calls may not be the same.

Most intrinsics using `__m128d` are prefixed with `_mm_` and are suffixed with “pd” (or otherwise contain “pd”). Not to be confused with “ps” which is used for `__m128`.

## §Examples

    #[cfg(target_arch = "x86")]
    use std::arch::x86::*;
    #[cfg(target_arch = "x86_64")]
    use std::arch::x86_64::*;

    let two_zeros = _mm_setzero_pd();
    let two_ones = _mm_set1_pd(1.0);
    let two_floats = _mm_set_pd(1.0, 2.0);

## Trait Implementations§

1.27.0 · Source§

### impl Clone for __m128d

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#### fn clone(&self) -> __m128d

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

Performs copy-assignment from `source`. Read more
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### impl Debug for __m128d

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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 From<Simd<f64, 2>> for __m128d

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#### fn from(value: f64x2) -> __m128d

Converts to this type from the input type.
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### impl From<__m128d> for f64x2

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#### fn from(value: __m128d) -> f64x2

Converts to this type from the input type.
1.27.0 · Source§

### impl Copy for __m128d

## Auto Trait Implementations§

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### impl Freeze for __m128d

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### impl RefUnwindSafe for __m128d

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### impl Send for __m128d

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### impl Sync for __m128d

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### impl Unpin for __m128d

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### impl UnwindSafe for __m128d

## 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.