Rollup merge of rust-lang#87227 - bstrie:asm2arch, r=Amanieu

Move asm! and global_asm! to core::arch

Follow-up to rust-lang/stdarch#1183 .

Implements the libs-api team decision from rust-lang#84019 (comment) .

In order to not break nightly users, this PR also adds the newly-moved items to the prelude. However, a decision will need to be made before stabilization as to whether these items should remain in the prelude. I will file an issue for this separately.

Fixes rust-lang#84019 .

r? `@Amanieu`

Author: GuillaumeGomez

library/core/src/lib.rs

@@ -316,5 +316,35 @@ pub mod primitive;
 #[unstable(feature = "stdsimd", issue = "48556")]
 mod core_arch;
 
+#[doc = include_str!("../../stdarch/crates/core_arch/src/core_arch_docs.md")]
 #[stable(feature = "simd_arch", since = "1.27.0")]
-pub use core_arch::arch;
+pub mod arch {
+    #[stable(feature = "simd_arch", since = "1.27.0")]
+    pub use crate::core_arch::arch::*;
+
+    /// Inline assembly.
+    ///
+    /// Read the [unstable book] for the usage.
+    ///
+    /// [unstable book]: ../../unstable-book/library-features/asm.html
+    #[unstable(
+        feature = "asm",
+        issue = "72016",
+        reason = "inline assembly is not stable enough for use and is subject to change"
+    )]
+    #[rustc_builtin_macro]
+    pub macro asm("assembly template", $(operands,)* $(options($(option),*))?) {
+        /* compiler built-in */
+    }
+
+    /// Module-level inline assembly.
+    #[unstable(
+        feature = "global_asm",
+        issue = "35119",
+        reason = "`global_asm!` is not stable enough for use and is subject to change"
+    )]
+    #[rustc_builtin_macro]
+    pub macro global_asm("assembly template", $(operands,)* $(options($(option),*))?) {
+        /* compiler built-in */
+    }
+}

library/core/src/macros/mod.rs

@@ -1312,27 +1312,6 @@ pub(crate) mod builtin {
         ($cond:expr, $($arg:tt)+) => {{ /* compiler built-in */ }};
     }
 
-    /// Inline assembly.
-    ///
-    /// Read the [unstable book] for the usage.
-    ///
-    /// [unstable book]: ../unstable-book/library-features/asm.html
-    #[unstable(
-        feature = "asm",
-        issue = "72016",
-        reason = "inline assembly is not stable enough for use and is subject to change"
-    )]
-    #[rustc_builtin_macro]
-    #[macro_export]
-    macro_rules! asm {
-        ("assembly template",
-            $(operands,)*
-            $(options($(option),*))?
-        ) => {
-            /* compiler built-in */
-        };
-    }
-
     /// LLVM-style inline assembly.
     ///
     /// Read the [unstable book] for the usage.
@@ -1355,23 +1334,6 @@ pub(crate) mod builtin {
         };
     }
 
-    /// Module-level inline assembly.
-    #[unstable(
-        feature = "global_asm",
-        issue = "35119",
-        reason = "`global_asm!` is not stable enough for use and is subject to change"
-    )]
-    #[rustc_builtin_macro]
-    #[macro_export]
-    macro_rules! global_asm {
-        ("assembly template",
-            $(operands,)*
-            $(options($(option),*))?
-        ) => {
-            /* compiler built-in */
-        };
-    }
-
     /// Prints passed tokens into the standard output.
     #[unstable(
         feature = "log_syntax",

library/core/src/prelude/v1.rs

@@ -55,11 +55,27 @@ pub use crate::hash::macros::Hash;
 #[allow(deprecated)]
 #[doc(no_inline)]
 pub use crate::{
-    asm, assert, cfg, column, compile_error, concat, concat_idents, env, file, format_args,
-    format_args_nl, global_asm, include, include_bytes, include_str, line, llvm_asm, log_syntax,
-    module_path, option_env, stringify, trace_macros,
+    assert, cfg, column, compile_error, concat, concat_idents, env, file, format_args,
+    format_args_nl, include, include_bytes, include_str, line, llvm_asm, log_syntax, module_path,
+    option_env, stringify, trace_macros,
 };
 
+#[unstable(
+    feature = "asm",
+    issue = "72016",
+    reason = "inline assembly is not stable enough for use and is subject to change"
+)]
+#[doc(no_inline)]
+pub use crate::arch::asm;
+
+#[unstable(
+    feature = "global_asm",
+    issue = "35119",
+    reason = "`global_asm!` is not stable enough for use and is subject to change"
+)]
+#[doc(no_inline)]
+pub use crate::arch::global_asm;
+
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[allow(deprecated, deprecated_in_future)]
 #[doc(no_inline)]

library/std/src/lib.rs

@@ -556,9 +556,9 @@ pub use core::{
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[allow(deprecated)]
 pub use core::{
-    asm, assert, assert_matches, cfg, column, compile_error, concat, concat_idents, env, file,
-    format_args, format_args_nl, global_asm, include, include_bytes, include_str, line, llvm_asm,
-    log_syntax, module_path, option_env, stringify, trace_macros,
+    assert, assert_matches, cfg, column, compile_error, concat, concat_idents, env, file,
+    format_args, format_args_nl, include, include_bytes, include_str, line, llvm_asm, log_syntax,
+    module_path, option_env, stringify, trace_macros,
 };
 
 #[stable(feature = "core_primitive", since = "1.43.0")]

library/std/src/prelude/v1.rs

@@ -39,12 +39,28 @@ pub use crate::result::Result::{self, Err, Ok};
 #[allow(deprecated)]
 #[doc(no_inline)]
 pub use core::prelude::v1::{
-    asm, assert, cfg, column, compile_error, concat, concat_idents, env, file, format_args,
-    format_args_nl, global_asm, include, include_bytes, include_str, line, llvm_asm, log_syntax,
-    module_path, option_env, stringify, trace_macros, Clone, Copy, Debug, Default, Eq, Hash, Ord,
-    PartialEq, PartialOrd,
+    assert, cfg, column, compile_error, concat, concat_idents, env, file, format_args,
+    format_args_nl, include, include_bytes, include_str, line, llvm_asm, log_syntax, module_path,
+    option_env, stringify, trace_macros, Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq,
+    PartialOrd,
 };
 
+#[unstable(
+    feature = "asm",
+    issue = "72016",
+    reason = "inline assembly is not stable enough for use and is subject to change"
+)]
+#[doc(no_inline)]
+pub use core::prelude::v1::asm;
+
+#[unstable(
+    feature = "global_asm",
+    issue = "35119",
+    reason = "`global_asm!` is not stable enough for use and is subject to change"
+)]
+#[doc(no_inline)]
+pub use core::prelude::v1::global_asm;
+
 // FIXME: Attribute and internal derive macros are not documented because for them rustdoc generates
 // dead links which fail link checker testing.
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]