Stabilize sse4a and tbm target features

 - remove some stabilized target features from `gate.rs`

Author: sayantn

compiler/rustc_feature/src/accepted.rs

@@ -396,6 +396,8 @@ declare_features! (
     (accepted, slice_patterns, "1.42.0", Some(62254)),
     /// Allows use of `&foo[a..b]` as a slicing syntax.
     (accepted, slicing_syntax, "1.0.0", None),
+    /// Allows use of `sse4a` target feature.
+    (accepted, sse4a_target_feature, "CURRENT_RUSTC_VERSION", Some(44839)),
     /// Allows elision of `'static` lifetimes in `static`s and `const`s.
     (accepted, static_in_const, "1.17.0", Some(35897)),
     /// Allows the definition recursive static items.
@@ -408,6 +410,8 @@ declare_features! (
     (accepted, target_feature, "1.27.0", None),
     /// Allows the use of `#[target_feature]` on safe functions.
     (accepted, target_feature_11, "1.86.0", Some(69098)),
+    /// Allows use of `tbm` target feature.
+    (accepted, tbm_target_feature, "CURRENT_RUSTC_VERSION", Some(44839)),
     /// Allows `fn main()` with return types which implements `Termination` (RFC 1937).
     (accepted, termination_trait, "1.26.0", Some(43301)),
     /// Allows `#[test]` functions where the return type implements `Termination` (RFC 1937).

compiler/rustc_feature/src/unstable.rs

@@ -334,8 +334,6 @@ declare_features! (
     (unstable, rtm_target_feature, "1.35.0", Some(44839)),
     (unstable, s390x_target_feature, "1.82.0", Some(44839)),
     (unstable, sparc_target_feature, "1.84.0", Some(132783)),
-    (unstable, sse4a_target_feature, "1.27.0", Some(44839)),
-    (unstable, tbm_target_feature, "1.27.0", Some(44839)),
     (unstable, wasm_target_feature, "1.30.0", Some(44839)),
     (unstable, x87_target_feature, "1.85.0", Some(44839)),
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!

compiler/rustc_target/src/target_features.rs

@@ -471,9 +471,9 @@ static X86_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
     ("sse3", Stable, &["sse2"]),
     ("sse4.1", Stable, &["ssse3"]),
     ("sse4.2", Stable, &["sse4.1"]),
-    ("sse4a", Unstable(sym::sse4a_target_feature), &["sse3"]),
+    ("sse4a", Stable, &["sse3"]),
     ("ssse3", Stable, &["sse3"]),
-    ("tbm", Unstable(sym::tbm_target_feature), &[]),
+    ("tbm", Stable, &[]),
     ("vaes", Stable, &["avx2", "aes"]),
     ("vpclmulqdq", Stable, &["avx", "pclmulqdq"]),
     ("widekl", Stable, &["kl"]),

library/core/src/lib.rs

@@ -200,8 +200,6 @@
 #![feature(riscv_target_feature)]
 #![feature(rtm_target_feature)]
 #![feature(s390x_target_feature)]
-#![feature(sse4a_target_feature)]
-#![feature(tbm_target_feature)]
 #![feature(wasm_target_feature)]
 #![feature(x86_amx_intrinsics)]
 // tidy-alphabetical-end

library/stdarch/crates/core_arch/src/lib.rs

@@ -18,8 +18,6 @@
     rustc_attrs,
     staged_api,
     doc_cfg,
-    tbm_target_feature,
-    sse4a_target_feature,
     riscv_target_feature,
     arm_target_feature,
     mips_target_feature,

tests/ui/target-feature/gate.rs

@@ -1,18 +1,12 @@
 //@ only-x86_64
 //
-// gate-test-sse4a_target_feature
 // gate-test-powerpc_target_feature
-// gate-test-tbm_target_feature
 // gate-test-arm_target_feature
 // gate-test-hexagon_target_feature
 // gate-test-mips_target_feature
 // gate-test-nvptx_target_feature
 // gate-test-wasm_target_feature
-// gate-test-adx_target_feature
-// gate-test-cmpxchg16b_target_feature
-// gate-test-movbe_target_feature
 // gate-test-rtm_target_feature
-// gate-test-f16c_target_feature
 // gate-test-riscv_target_feature
 // gate-test-ermsb_target_feature
 // gate-test-bpf_target_feature

tests/ui/target-feature/gate.stderr

@@ -1,5 +1,5 @@
 error[E0658]: the target feature `x87` is currently unstable
-  --> $DIR/gate.rs:30:18
+  --> $DIR/gate.rs:24:18
    |
 LL | #[target_feature(enable = "x87")]
    |                  ^^^^^^^^^^^^^^