Stabilize sha512_sm_x86, and the sha512, sm3 and sm4 target features

Author: sayantn

compiler/rustc_feature/src/accepted.rs

@@ -378,6 +378,8 @@ declare_features! (
     (accepted, self_in_typedefs, "1.32.0", Some(49303)),
     /// Allows `Self` struct constructor (RFC 2302).
     (accepted, self_struct_ctor, "1.32.0", Some(51994)),
+    /// Allows use of x86 SHA512, SM3 and SM4 target-features and intrinsics
+    (accepted, sha512_sm_x86, "CURRENT_RUSTC_VERSION", Some(126624)),
     /// Shortern the tail expression lifetime
     (accepted, shorter_tail_lifetimes, "1.84.0", Some(123739)),
     /// Allows using subslice patterns, `[a, .., b]` and `[a, xs @ .., b]`.

compiler/rustc_feature/src/unstable.rs

@@ -628,8 +628,6 @@ declare_features! (
     (unstable, return_type_notation, "1.70.0", Some(109417)),
     /// Allows `extern "rust-cold"`.
     (unstable, rust_cold_cc, "1.63.0", Some(97544)),
-    /// Allows use of x86 SHA512, SM3 and SM4 target-features and intrinsics
-    (unstable, sha512_sm_x86, "1.82.0", Some(126624)),
     /// Allows the use of SIMD types in functions declared in `extern` blocks.
     (unstable, simd_ffi, "1.0.0", Some(27731)),
     /// Allows specialization of implementations (RFC 1210).

compiler/rustc_target/src/target_features.rs

@@ -455,9 +455,9 @@ static X86_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
     ("rdseed", Stable, &[]),
     ("rtm", Unstable(sym::rtm_target_feature), &[]),
     ("sha", Stable, &["sse2"]),
-    ("sha512", Unstable(sym::sha512_sm_x86), &["avx2"]),
-    ("sm3", Unstable(sym::sha512_sm_x86), &["avx"]),
-    ("sm4", Unstable(sym::sha512_sm_x86), &["avx2"]),
+    ("sha512", Stable, &["avx2"]),
+    ("sm3", Stable, &["avx"]),
+    ("sm4", Stable, &["avx2"]),
     // This cannot actually be toggled, the ABI always fixes it, so it'd make little sense to
     // stabilize. It must be in this list for the ABI check to be able to use it.
     ("soft-float", Stability::Unstable(sym::x87_target_feature), &[]),

library/core/src/lib.rs

@@ -188,6 +188,7 @@
 //
 // Target features:
 // tidy-alphabetical-start
+#![cfg_attr(bootstrap, feature(sha512_sm_x86))]
 #![feature(aarch64_unstable_target_feature)]
 #![feature(arm_target_feature)]
 #![feature(avx512_target_feature)]
@@ -199,7 +200,6 @@
 #![feature(riscv_target_feature)]
 #![feature(rtm_target_feature)]
 #![feature(s390x_target_feature)]
-#![feature(sha512_sm_x86)]
 #![feature(sse4a_target_feature)]
 #![feature(tbm_target_feature)]
 #![feature(wasm_target_feature)]