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authorbors <bors@rust-lang.org>2020-11-29 09:28:09 +0000
committerbors <bors@rust-lang.org>2020-11-29 09:28:09 +0000
commit760430e6fdd70cdb09b5b6d696905c0ee0ea27c8 (patch)
tree3807c43e5e80fb6daf02630212578b400258495a /library/std/src/sys/unix/stack_overflow.rs
parent3cbb56f80b2fbf5a3b405212665918dbffc44d39 (diff)
parent354c7d0ab800f70e995383d498fc1fc420baa209 (diff)
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Auto merge of #78863 - KodrAus:feat/simd-array, r=oli-obk
Support repr(simd) on ADTs containing a single array field

This is a squash and rebase of `@gnzlbg's` #63531

I've never actually written code in the compiler before so just fumbled my way around until it would build 😅

I imagine there'll be some work we need to do in `rustc_codegen_cranelift` too for this now, but might need some input from `@bjorn3` to know what that is.

cc `@rust-lang/project-portable-simd`

-----

This PR allows using `#[repr(simd)]` on ADTs containing a single array field:

```rust
 #[repr(simd)] struct S0([f32; 4]);
 #[repr(simd)] struct S1<const N: usize>([f32; N]);
 #[repr(simd)] struct S2<T, const N: usize>([T; N]);
```

This should allow experimenting with portable packed SIMD abstractions on nightly that make use of const generics.
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