Stabilize the keylocker_x86 flag, and the kl and widekl target features

Author: sayantn

compiler/rustc_feature/src/accepted.rs

@@ -257,6 +257,8 @@ declare_features! (
     /// Allows some increased flexibility in the name resolution rules,
     /// especially around globs and shadowing (RFC 1560).
     (accepted, item_like_imports, "1.15.0", Some(35120)),
+    // Allows using the `kl` and `widekl` target features and the associated intrinsics
+    (accepted, keylocker_x86, "CURRENT_RUSTC_VERSION", Some(134813)),
     /// Allows `'a: { break 'a; }`.
     (accepted, label_break_value, "1.65.0", Some(48594)),
     /// Allows `let...else` statements.

compiler/rustc_feature/src/unstable.rs

@@ -545,8 +545,6 @@ declare_features! (
     (incomplete, inherent_associated_types, "1.52.0", Some(8995)),
     /// Allows using `pointer` and `reference` in intra-doc links
     (unstable, intra_doc_pointers, "1.51.0", Some(80896)),
-    // Allows using the `kl` and `widekl` target features and the associated intrinsics
-    (unstable, keylocker_x86, "1.86.0", Some(134813)),
     // Allows setting the threshold for the `large_assignments` lint.
     (unstable, large_assignments, "1.52.0", Some(83518)),
     /// Allow to have type alias types for inter-crate use.

compiler/rustc_target/src/target_features.rs

@@ -443,7 +443,7 @@ static X86_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
     ("fma", Stable, &["avx"]),
     ("fxsr", Stable, &[]),
     ("gfni", Unstable(sym::avx512_target_feature), &["sse2"]),
-    ("kl", Unstable(sym::keylocker_x86), &["sse2"]),
+    ("kl", Stable, &["sse2"]),
     ("lahfsahf", Unstable(sym::lahfsahf_target_feature), &[]),
     ("lzcnt", Stable, &[]),
     ("movbe", Stable, &[]),
@@ -471,7 +471,7 @@ static X86_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
     ("tbm", Unstable(sym::tbm_target_feature), &[]),
     ("vaes", Unstable(sym::avx512_target_feature), &["avx2", "aes"]),
     ("vpclmulqdq", Unstable(sym::avx512_target_feature), &["avx", "pclmulqdq"]),
-    ("widekl", Unstable(sym::keylocker_x86), &["kl"]),
+    ("widekl", Stable, &["kl"]),
     ("x87", Unstable(sym::x87_target_feature), &[]),
     ("xop", Unstable(sym::xop_target_feature), &[/*"fma4", */ "avx", "sse4a"]),
     ("xsave", Stable, &[]),

library/core/src/lib.rs

@@ -188,11 +188,11 @@
 //
 // Target features:
 // tidy-alphabetical-start
+#![cfg_attr(bootstrap, feature(keylocker_x86))]
 #![feature(aarch64_unstable_target_feature)]
 #![feature(arm_target_feature)]
 #![feature(avx512_target_feature)]
 #![feature(hexagon_target_feature)]
-#![feature(keylocker_x86)]
 #![feature(loongarch_target_feature)]
 #![feature(mips_target_feature)]
 #![feature(powerpc_target_feature)]