diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index ad35204804755..5c5ebff6594d9 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -115,6 +115,8 @@
 #![feature(wasm_target_feature)]
 #![feature(avx512_target_feature)]
 #![feature(cmpxchg16b_target_feature)]
+#![feature(f16c_target_feature)]
+#![feature(rtm_target_feature)]
 #![feature(const_slice_len)]
 #![feature(const_str_as_bytes)]
 #![feature(const_str_len)]
diff --git a/src/stdsimd b/src/stdsimd
index 4bf456c35e85f..87d19d212ef17 160000
--- a/src/stdsimd
+++ b/src/stdsimd
@@ -1 +1 @@
-Subproject commit 4bf456c35e85fcca5cf95008401af8ab25abf850
+Subproject commit 87d19d212ef172a6cfbb3a330ac1c33da16cced6