如何将 16 字节的内存加载到 Rust __m128i?
How to load 16 bytes of memory into a Rust __m128i?
我正在尝试从 std::arch
模块将 16 字节的内存加载到 __m128i
类型中:
#[cfg(all(target_arch = "x86_64", target_feature = "sse2"))]
use std::arch::x86_64::__m128i;
fn foo() {
#[cfg(all(target_arch = "x86_64", target_feature = "sse2"))]
use std::arch::x86_64::_mm_load_si128;
unsafe {
let mut f: [i8; 16] = [0; 16];
f[0] = 5;
f[1] = 66;
let g = _mm_load_si128(f as *const __m128i);
}
}
fn main() {
foo();
}
我的代码导致错误:
error[E0605]: non-primitive cast: `[i8; 16]` as `*const __m128i`
--> src/main.rs:12:32
|
12 | let g = _mm_load_si128(f as *const __m128i);
| ^^^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
从 documentation 中不清楚如何使用 _mm_load_si128
从现有内存或现有类型加载字节。我希望能够通过加载内在函数将一些现有类型的字节加载到 __m128i
中。
via a load intrinsic
内在函数是 functions listed in the docs. Your specific example of loading from memory is covered by the examples in the module:
let invec = _mm_loadu_si128(src.as_ptr() as *const _);
针对您的情况:
let g = _mm_load_si128(f.as_ptr() as *const _);
另请参阅:
我正在尝试从 std::arch
模块将 16 字节的内存加载到 __m128i
类型中:
#[cfg(all(target_arch = "x86_64", target_feature = "sse2"))]
use std::arch::x86_64::__m128i;
fn foo() {
#[cfg(all(target_arch = "x86_64", target_feature = "sse2"))]
use std::arch::x86_64::_mm_load_si128;
unsafe {
let mut f: [i8; 16] = [0; 16];
f[0] = 5;
f[1] = 66;
let g = _mm_load_si128(f as *const __m128i);
}
}
fn main() {
foo();
}
我的代码导致错误:
error[E0605]: non-primitive cast: `[i8; 16]` as `*const __m128i`
--> src/main.rs:12:32
|
12 | let g = _mm_load_si128(f as *const __m128i);
| ^^^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
从 documentation 中不清楚如何使用 _mm_load_si128
从现有内存或现有类型加载字节。我希望能够通过加载内在函数将一些现有类型的字节加载到 __m128i
中。
via a load intrinsic
内在函数是 functions listed in the docs. Your specific example of loading from memory is covered by the examples in the module:
let invec = _mm_loadu_si128(src.as_ptr() as *const _);
针对您的情况:
let g = _mm_load_si128(f.as_ptr() as *const _);
另请参阅: