#[repr(simd)]
pub struct __m128i();
Available on x86-64 and (x86 or x86-64) only.
Expand description
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);
Performs copy-assignment from
source
.
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Formats the value using the given formatter.
Read more
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Immutably borrows from an owned value.
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Mutably borrows from an owned value.
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🔬This is a nightly-only experimental API. (clone_to_uninit
#126799) Performs copy-assignment from
self
to
dst
.
Read more
Returns the argument unchanged.
Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From<T> for U
chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.