diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs
index 78df4a8f6e02e..5ea6e98b49cf5 100644
--- a/library/core/src/lib.rs
+++ b/library/core/src/lib.rs
@@ -419,10 +419,6 @@ pub mod primitive;
     deprecated_in_future
 )]
 #[allow(rustdoc::bare_urls)]
-// FIXME: This annotation should be moved into rust-lang/stdarch after clashing_extern_declarations is
-// merged. It currently cannot because bootstrap fails as the lint hasn't been defined yet.
-#[allow(clashing_extern_declarations)]
-#[unstable(feature = "stdsimd", issue = "48556")]
 mod core_arch;
 
 #[stable(feature = "simd_arch", since = "1.27.0")]
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index f57c8d4e7e282..9ec0c3d581eba 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -378,7 +378,6 @@
 #![feature(get_many_mut)]
 #![feature(lazy_cell)]
 #![feature(log_syntax)]
-#![feature(stdsimd)]
 #![feature(test)]
 #![feature(trace_macros)]
 // tidy-alphabetical-end
@@ -617,13 +616,16 @@ pub mod arch {
 
     #[stable(feature = "simd_aarch64", since = "1.60.0")]
     pub use std_detect::is_aarch64_feature_detected;
+    #[unstable(feature = "stdarch_arm_feature_detection", issue = "111190")]
+    pub use std_detect::is_arm_feature_detected;
+    #[unstable(feature = "is_riscv_feature_detected", issue = "111192")]
+    pub use std_detect::is_riscv_feature_detected;
     #[stable(feature = "simd_x86", since = "1.27.0")]
     pub use std_detect::is_x86_feature_detected;
-    #[unstable(feature = "stdsimd", issue = "48556")]
-    pub use std_detect::{
-        is_arm_feature_detected, is_mips64_feature_detected, is_mips_feature_detected,
-        is_powerpc64_feature_detected, is_powerpc_feature_detected, is_riscv_feature_detected,
-    };
+    #[unstable(feature = "stdarch_mips_feature_detection", issue = "111188")]
+    pub use std_detect::{is_mips64_feature_detected, is_mips_feature_detected};
+    #[unstable(feature = "stdarch_powerpc_feature_detection", issue = "111191")]
+    pub use std_detect::{is_powerpc64_feature_detected, is_powerpc_feature_detected};
 }
 
 // This was stabilized in the crate root so we have to keep it there.
diff --git a/library/std/tests/run-time-detect.rs b/library/std/tests/run-time-detect.rs
index 9ce29a33df6e6..c9b9c54e3d49c 100644
--- a/library/std/tests/run-time-detect.rs
+++ b/library/std/tests/run-time-detect.rs
@@ -1,12 +1,16 @@
 //! These tests just check that the macros are available in std.
 
 #![cfg_attr(
-    any(
-        all(target_arch = "arm", any(target_os = "linux", target_os = "android")),
-        all(target_arch = "powerpc", target_os = "linux"),
-        all(target_arch = "powerpc64", target_os = "linux"),
-    ),
-    feature(stdsimd)
+    all(target_arch = "arm", any(target_os = "linux", target_os = "android")),
+    feature(stdarch_arm_feature_detection)
+)]
+#![cfg_attr(
+    all(target_arch = "powerpc", target_os = "linux"),
+    feature(stdarch_powerpc_feature_detection)
+)]
+#![cfg_attr(
+    all(target_arch = "powerpc64", target_os = "linux"),
+    feature(stdarch_powerpc_feature_detection)
 )]
 
 #[test]
diff --git a/src/tools/miri/tests/pass/intrinsics-x86-aes-vaes.rs b/src/tools/miri/tests/pass/intrinsics-x86-aes-vaes.rs
index 090b1db0af0c2..9ba00100605cf 100644
--- a/src/tools/miri/tests/pass/intrinsics-x86-aes-vaes.rs
+++ b/src/tools/miri/tests/pass/intrinsics-x86-aes-vaes.rs
@@ -9,7 +9,7 @@
 //@ignore-target-wasm32
 //@compile-flags: -C target-feature=+aes,+vaes,+avx512f
 
-#![feature(avx512_target_feature, stdsimd)]
+#![feature(avx512_target_feature, stdarch_x86_avx512)]
 
 use core::mem::transmute;
 #[cfg(target_arch = "x86")]
diff --git a/src/tools/miri/tests/pass/intrinsics-x86-avx512.rs b/src/tools/miri/tests/pass/intrinsics-x86-avx512.rs
index c38158dc797ca..a51a39bb2e3b0 100644
--- a/src/tools/miri/tests/pass/intrinsics-x86-avx512.rs
+++ b/src/tools/miri/tests/pass/intrinsics-x86-avx512.rs
@@ -10,7 +10,7 @@
 //@compile-flags: -C target-feature=+avx512f,+avx512vl,+avx512bitalg,+avx512vpopcntdq
 
 #![feature(avx512_target_feature)]
-#![feature(stdsimd)]
+#![feature(stdarch_x86_avx512)]
 
 #[cfg(target_arch = "x86")]
 use std::arch::x86::*;
diff --git a/tests/ui/asm/aarch64/type-check-3.rs b/tests/ui/asm/aarch64/type-check-3.rs
index 623f6593d79ba..77524ba7aa5e4 100644
--- a/tests/ui/asm/aarch64/type-check-3.rs
+++ b/tests/ui/asm/aarch64/type-check-3.rs
@@ -1,7 +1,7 @@
 // only-aarch64
 // compile-flags: -C target-feature=+neon
 
-#![feature(repr_simd, stdsimd, asm_const)]
+#![feature(repr_simd, asm_const)]
 
 use std::arch::aarch64::float64x2_t;
 use std::arch::{asm, global_asm};
diff --git a/tests/ui/asm/aarch64/type-check-4.rs b/tests/ui/asm/aarch64/type-check-4.rs
index bd23755c02316..5dec60a2138d9 100644
--- a/tests/ui/asm/aarch64/type-check-4.rs
+++ b/tests/ui/asm/aarch64/type-check-4.rs
@@ -1,7 +1,7 @@
 // only-aarch64
 // compile-flags: -C target-feature=+neon
 
-#![feature(repr_simd, stdsimd, asm_const)]
+#![feature(repr_simd, asm_const)]
 
 use std::arch::aarch64::float64x2_t;
 use std::arch::{asm, global_asm};