core::arch::x86_64

Struct __m128

1.27.0 · source
#[repr(simd)]
pub struct __m128(/* private fields */);
Available on x86-64 and (x86 or x86-64) only.
Expand description

128-bit wide set of four f32 types, x86-specific

This type is the same as the __m128 type defined by Intel, representing a 128-bit SIMD register which internally is consisted of four packed f32 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 __m128 type has one interpretation. Each instance of __m128 always corresponds to f32x4, or four f32 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 __m128 are prefixed with _mm_ and are suffixed with “ps” (or otherwise contain “ps”). Not to be confused with “pd” which is used for __m128d.

§Examples

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

let four_zeros = _mm_setzero_ps();
let four_ones = _mm_set1_ps(1.0);
let four_floats = _mm_set_ps(1.0, 2.0, 3.0, 4.0);

Trait Implementations§

1.27.0 · source§

impl Clone for __m128

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fn clone(&self) -> __m128

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
1.27.0 · source§

impl Debug for __m128

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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<f32, 4>> for __m128

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fn from(value: f32x4) -> __m128

Converts to this type from the input type.
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impl From<__m128> for f32x4

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fn from(value: __m128) -> f32x4

Converts to this type from the input type.
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impl Copy for __m128

Auto Trait Implementations§

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impl Freeze for __m128

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impl RefUnwindSafe for __m128

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impl Send for __m128

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impl Sync for __m128

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impl Unpin for __m128

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impl UnwindSafe for __m128

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, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dst. 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.