diff --git a/compiler/rustc_codegen_ssa/src/target_features.rs b/compiler/rustc_codegen_ssa/src/target_features.rs
index d802816bb7561..6d1da321218ba 100644
--- a/compiler/rustc_codegen_ssa/src/target_features.rs
+++ b/compiler/rustc_codegen_ssa/src/target_features.rs
@@ -330,7 +330,7 @@ const WASM_ALLOWED_FEATURES: &[(&str, Stability)] = &[
     ("mutable-globals", Unstable(sym::wasm_target_feature)),
     ("nontrapping-fptoint", Unstable(sym::wasm_target_feature)),
     ("reference-types", Unstable(sym::wasm_target_feature)),
-    ("relaxed-simd", Unstable(sym::wasm_target_feature)),
+    ("relaxed-simd", Stable),
     ("sign-ext", Unstable(sym::wasm_target_feature)),
     ("simd128", Stable),
     // tidy-alphabetical-end
diff --git a/library/stdarch b/library/stdarch
index f4528dd6e85d9..b654a0352dec0 160000
--- a/library/stdarch
+++ b/library/stdarch
@@ -1 +1 @@
-Subproject commit f4528dd6e85d97bb802240d7cd048b6e1bf72540
+Subproject commit b654a0352dec0ae95adb33b32d58ea7e0f1101da