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Stuart Cook
2b150f2c65
Offload intrinsic
This PR implements the minimal mechanisms required to run a small subset of arbitrary offload kernels without relying on hardcoded names or metadata.
- `offload(kernel, (..args))`: an intrinsic that generates the necessary host-side LLVM-IR code.
- `rustc_offload_kernel`: a builtin attribute that marks device kernels to be handled appropriately.
Example usage (pseudocode):
```rust
fn kernel(x: *mut [f64; 128]) {
core::intrinsics::offload(kernel_1, (x,))
}
#[cfg(target_os = "linux")]
extern "C" {
pub fn kernel_1(array_b: *mut [f64; 128]);
}
#[cfg(not(target_os = "linux"))]
#[rustc_offload_kernel]
extern "gpu-kernel" fn kernel_1(x: *mut [f64; 128]) {
unsafe { (*x)[0] = 21.0 };
}
```