Commits on Apr 16, 2018

1. 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/stdarch#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 rust-lang#29717
   Closes rust-lang#44839
   Closes rust-lang#48556

   

   alexcrichton committed Apr 16, 2018
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2. Separately gate each target_feature feature …

   Use an explicit whitelist for what features are actually stable and can be
   enabled.

   

   alexcrichton committed Apr 16, 2018
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