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Update rustc-dev-guide

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This commit is contained in:
Marcelo Domínguez 2025-11-17 18:40:25 +01:00
parent 5128ce10a0
commit f39ec4756f
2 changed files with 13 additions and 1 deletions
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3
library/core/src/intrinsics/mod.rs
View file

@ -3349,6 +3349,9 @@ pub const fn autodiff<F, G, T: crate::marker::Tuple, R>(f: F, df: G, args: T) ->
/// unsafe { (*x)[0] = 21.0 };
/// }
/// ```
///
/// For reference, see the Clang documentation on offloading:
/// <https://clang.llvm.org/docs/OffloadingDesign.html>.
#[rustc_nounwind]
#[rustc_intrinsic]
pub const fn offload<F, T: crate::marker::Tuple, R>(f: F, args: T) -> R;

11
src/doc/rustc-dev-guide/src/offload/usage.md
View file

@ -5,6 +5,8 @@ We currently work on launching the following Rust kernel on the GPU. To follow a
```rust
#![feature(abi_gpu_kernel)]
#![feature(rustc_attrs)]
#![feature(core_intrinsics)]
#![no_std]
#[cfg(target_os = "linux")]
@ -12,6 +14,7 @@ extern crate libc;
#[cfg(target_os = "linux")]
use libc::c_char;
#[cfg(target_os = "linux")]
use core::mem;
#[panic_handler]
@ -38,7 +41,7 @@ fn main() {
}
unsafe {
kernel_1(array_c);
kernel(array_c);
}
core::hint::black_box(&array_c);
unsafe {
@ -52,6 +55,11 @@ fn main() {
}
}
#[inline(never)]
unsafe fn kernel(x: *mut [f64; 256]) {
core::intrinsics::offload(kernel_1, (x,))
}
#[cfg(target_os = "linux")]
unsafe extern "C" {
pub fn kernel_1(array_b: *mut [f64; 256]);
@ -60,6 +68,7 @@ unsafe extern "C" {
#[cfg(not(target_os = "linux"))]
#[unsafe(no_mangle)]
#[inline(never)]
#[rustc_offload_kernel]
pub extern "gpu-kernel" fn kernel_1(x: *mut [f64; 256]) {
unsafe { (*x)[0] = 21.0 };
}