error[E0432]: unresolved import `self::arm::check_for`
--> src/libstd/../stdarch/crates/std_detect/src/detect/os/freebsd/mod.rs:11:17
|
11 | pub use self::arm::check_for;
| ^^^^^^^^^^^^^^^^^^^^ no `check_for` in `std_detect::detect::os::arm`
error[E0425]: cannot find value `detect_features` in module `self::os`
--> src/libstd/../stdarch/crates/std_detect/src/detect/mod.rs:121:37
|
121 | cache::test(x as u32, self::os::detect_features)
| ^^^^^^^^^^^^^^^ not found in `self::os`
|
help: possible candidate is found in another module, you can import it into scope
|
20 | use crate::std_detect::detect::os::arm::detect_features;
* re-stabilize the AVX-512 features that were stabilized in Rust 1.27.0
https://github.com/rust-lang/stdarch/pull/739 added per-feature
stabilization of runtime CPU feature detection. In so doing, it
de-stabilized some detection features that had been stable since Rust
1.27.0, breaking some published crates (on nightly). This commit
re-stabilizes the subset of AVX-512 detection features that were
included in 1.27.0 (that is, the pre-Ice-Lake subset). Other instruction
sets (MMX in particular) remain de-stabilized, pending a decision about
whether should ever stabilize them.
See https://github.com/rust-lang/rust/issues/68905.
* add a comment explaining feature detection stability
* adjust stabilizations to match most recent proposal
https://github.com/rust-lang/rust/issues/68905#issuecomment-595376319
* Fix race condition in feature cache on 32 platforms
If we observe that the second word is initialized, we can't really
assume that the first is initialized as well. So check each word
separately.
* Use stronger atomic ordering
Better SeqCst than sorry!
* Use two caches on x64 for simplicity
These are needed for rustc to be able to correctly handle stability of constness of intrinsics. Without either `rustc_const_unstable` or `rustc_const_stable` an intrinsic is not const evaluable at all.
When building on aarch64, the following warning occurs.
```
warning: unused import: `mem::transmute`
--> crates/core_arch/src/arm/neon.rs:3:38
|
3 | use crate::{core_arch::simd_llvm::*, mem::transmute};
| ^^^^^^^^^^^^^^
|
= note: `#[warn(unused_imports)]` on by default
```
