Struct __m128i

#[repr(simd)]
pub struct __m128i(/* private fields */);

Available on x86 only.

128-bit wide integer vector type, x86-specific

This type is the same as the __m128i type defined by Intel, representing a 128-bit SIMD register. Usage of this type typically corresponds to the sse and up target features for x86/x86_64.

Internally this type may be viewed as:

• i8x16 - sixteen i8 variables packed together
• i16x8 - eight i16 variables packed together
• i32x4 - four i32 variables packed together
• i64x2 - two i64 variables packed together

(as well as unsigned versions). Each intrinsic may interpret the internal bits differently, check the documentation of the intrinsic to see how it’s being used.

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.

Note that this means that an instance of __m128i typically just means a “bag of bits” which is left up to interpretation at the point of use.

Most intrinsics using __m128i are prefixed with _mm_ and the integer types tend to correspond to suffixes like “epi8” or “epi32”.

Examples

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

let all_bytes_zero = _mm_setzero_si128();
let all_bytes_one = _mm_set1_epi8(1);
let four_i32 = _mm_set_epi32(1, 2, 3, 4);

Trait Implementations

impl AsBytes for __m128i

fn as_bytes(&self) -> &[u8]

Gets the bytes of this value.

fn as_bytes_mut(&mut self) -> &mut [u8]

where Self: FromBytes,

Gets the bytes of this value mutably.

fn write_to(&self, bytes: &mut [u8]) -> Option<()>

Writes a copy of self to bytes.

fn write_to_prefix(&self, bytes: &mut [u8]) -> Option<()>

Writes a copy of self to the prefix of bytes.

fn write_to_suffix(&self, bytes: &mut [u8]) -> Option<()>

Writes a copy of self to the suffix of bytes.

impl Clone for __m128i

fn clone(&self) -> __m128i

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for __m128i

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

Formats the value using the given formatter.

impl From<Simd<i16, 8>> for __m128i

fn from(value: Simd<i16, 8>) -> __m128i

Converts to this type from the input type.

impl From<Simd<i32, 4>> for __m128i

fn from(value: Simd<i32, 4>) -> __m128i

Converts to this type from the input type.

impl From<Simd<i64, 2>> for __m128i

fn from(value: Simd<i64, 2>) -> __m128i

Converts to this type from the input type.

impl From<Simd<i8, 16>> for __m128i

fn from(value: Simd<i8, 16>) -> __m128i

Converts to this type from the input type.

impl From<Simd<isize, 4>> for __m128i

fn from(value: Simd<isize, 4>) -> __m128i

Converts to this type from the input type.

impl From<Simd<u16, 8>> for __m128i

fn from(value: Simd<u16, 8>) -> __m128i

Converts to this type from the input type.

impl From<Simd<u32, 4>> for __m128i

fn from(value: Simd<u32, 4>) -> __m128i

Converts to this type from the input type.

impl From<Simd<u64, 2>> for __m128i

fn from(value: Simd<u64, 2>) -> __m128i

Converts to this type from the input type.

impl From<Simd<u8, 16>> for __m128i

fn from(value: Simd<u8, 16>) -> __m128i

Converts to this type from the input type.

impl From<Simd<usize, 4>> for __m128i

fn from(value: Simd<usize, 4>) -> __m128i

Converts to this type from the input type.

impl From<__m128i> for Simd<i16, 8>

fn from(value: __m128i) -> Simd<i16, 8>

Converts to this type from the input type.

impl From<__m128i> for Simd<i32, 4>

fn from(value: __m128i) -> Simd<i32, 4>

Converts to this type from the input type.

impl From<__m128i> for Simd<i64, 2>

fn from(value: __m128i) -> Simd<i64, 2>

Converts to this type from the input type.

impl From<__m128i> for Simd<i8, 16>

fn from(value: __m128i) -> Simd<i8, 16>

Converts to this type from the input type.

impl From<__m128i> for Simd<isize, 4>

fn from(value: __m128i) -> Simd<isize, 4>

Converts to this type from the input type.

impl From<__m128i> for Simd<u16, 8>

fn from(value: __m128i) -> Simd<u16, 8>

Converts to this type from the input type.

impl From<__m128i> for Simd<u32, 4>

fn from(value: __m128i) -> Simd<u32, 4>

Converts to this type from the input type.

impl From<__m128i> for Simd<u64, 2>

fn from(value: __m128i) -> Simd<u64, 2>

Converts to this type from the input type.

impl From<__m128i> for Simd<u8, 16>

fn from(value: __m128i) -> Simd<u8, 16>

Converts to this type from the input type.

impl From<__m128i> for Simd<usize, 4>

fn from(value: __m128i) -> Simd<usize, 4>

Converts to this type from the input type.

impl FromBytes for __m128i

fn ref_from(bytes: &[u8]) -> Option<&Self>

where Self: Sized,

Interprets the given bytes as a &Self without copying.

fn ref_from_prefix(bytes: &[u8]) -> Option<&Self>

where Self: Sized,

Interprets the prefix of the given bytes as a &Self without copying.

fn ref_from_suffix(bytes: &[u8]) -> Option<&Self>

where Self: Sized,

Interprets the suffix of the given bytes as a &Self without copying.

fn mut_from(bytes: &mut [u8]) -> Option<&mut Self>

where Self: Sized + AsBytes,

Interprets the given bytes as a &mut Self without copying.

fn mut_from_prefix(bytes: &mut [u8]) -> Option<&mut Self>

where Self: Sized + AsBytes,

Interprets the prefix of the given bytes as a &mut Self without copying.

fn mut_from_suffix(bytes: &mut [u8]) -> Option<&mut Self>

where Self: Sized + AsBytes,

Interprets the suffix of the given bytes as a &mut Self without copying.

fn slice_from(bytes: &[u8]) -> Option<&[Self]>

where Self: Sized,

Interprets the given bytes as a &[Self] without copying.

fn slice_from_prefix(bytes: &[u8], count: usize) -> Option<(&[Self], &[u8])>

where Self: Sized,

Interprets the prefix of the given bytes as a &[Self] with length equal to count without copying.

fn slice_from_suffix(bytes: &[u8], count: usize) -> Option<(&[u8], &[Self])>

where Self: Sized,

Interprets the suffix of the given bytes as a &[Self] with length equal to count without copying.

fn mut_slice_from(bytes: &mut [u8]) -> Option<&mut [Self]>

where Self: Sized + AsBytes,

Interprets the given bytes as a &mut [Self] without copying.

fn mut_slice_from_prefix( bytes: &mut [u8], count: usize, ) -> Option<(&mut [Self], &mut [u8])>

where Self: Sized + AsBytes,

Interprets the prefix of the given bytes as a &mut [Self] with length equal to count without copying.

fn mut_slice_from_suffix( bytes: &mut [u8], count: usize, ) -> Option<(&mut [u8], &mut [Self])>

where Self: Sized + AsBytes,

Interprets the suffix of the given bytes as a &mut [Self] with length equal to count without copying.

fn read_from(bytes: &[u8]) -> Option<Self>

where Self: Sized,

Reads a copy of Self from bytes.

fn read_from_prefix(bytes: &[u8]) -> Option<Self>

where Self: Sized,

Reads a copy of Self from the prefix of bytes.

fn read_from_suffix(bytes: &[u8]) -> Option<Self>

where Self: Sized,

Reads a copy of Self from the suffix of bytes.

impl FromZeroes for __m128i

fn zero(&mut self)

Overwrites self with zeroes.

fn new_zeroed() -> Self

where Self: Sized,

Creates an instance of Self from zeroed bytes.

impl Copy for __m128i