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Auto merge of #49664 - alexcrichton:stable-simd, r=BurntSushi

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Stabilize x86/x86_64 SIMD

This commit stabilizes the SIMD in Rust for the x86/x86_64 platforms. Notably
this commit is stabilizing:

* The `std::arch::{x86, x86_64}` modules and the intrinsics contained inside.
* The `is_x86_feature_detected!` macro in the standard library
* The `#[target_feature(enable = "...")]` attribute
* The `#[cfg(target_feature = "...")]` matcher

Stabilization of the module and intrinsics were primarily done in
rust-lang-nursery/stdsimd#414 and the two attribute stabilizations are done in
this commit. The standard library is also tweaked a bit with the new way that
stdsimd is integrated.

Note that other architectures like `std::arch::arm` are not stabilized as part
of this commit, they will likely stabilize in the future after they've been
implemented and fleshed out. Similarly the `std::simd` module is also not being
stabilized in this commit, only `std::arch`. Finally, nothing related to `__m64`
is stabilized in this commit either (MMX), only SSE and up types and intrinsics
are stabilized.

Closes #29717
Closes #44839
Closes #48556
This commit is contained in:
bors 2018-04-17 03:57:22 +00:00
commit 186db76159
18 changed files with 239 additions and 162 deletions
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src/libstd/lib.rs
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@ -526,7 +526,7 @@ mod coresimd {
#[unstable(feature = "stdsimd", issue = "48556")]
#[cfg(all(not(stage0), not(test)))]
pub use stdsimd::simd;
#[unstable(feature = "stdsimd", issue = "48556")]
#[stable(feature = "simd_arch", since = "1.27.0")]
#[cfg(all(not(stage0), not(test)))]
pub use stdsimd::arch;