2 files changed, 22 insertions, 0 deletions
diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs
index 76270cad48f..6cc8b2b2220 100644
--- a/compiler/rustc_feature/src/builtin_attrs.rs
+++ b/compiler/rustc_feature/src/builtin_attrs.rs
@@ -40,6 +40,26 @@ const GATED_CFGS: &[GatedCfg] = &[
     // this is consistent with naming of the compiler flag it's for
     (sym::fmt_debug, sym::fmt_debug, Features::fmt_debug),
     (sym::emscripten_wasm_eh, sym::cfg_emscripten_wasm_eh, Features::cfg_emscripten_wasm_eh),
+    (
+        sym::target_has_reliable_f16,
+        sym::cfg_target_has_reliable_f16_f128,
+        Features::cfg_target_has_reliable_f16_f128,
+    ),
+    (
+        sym::target_has_reliable_f16_math,
+        sym::cfg_target_has_reliable_f16_f128,
+        Features::cfg_target_has_reliable_f16_f128,
+    ),
+    (
+        sym::target_has_reliable_f128,
+        sym::cfg_target_has_reliable_f16_f128,
+        Features::cfg_target_has_reliable_f16_f128,
+    ),
+    (
+        sym::target_has_reliable_f128_math,
+        sym::cfg_target_has_reliable_f16_f128,
+        Features::cfg_target_has_reliable_f16_f128,
+    ),
 ];
 
 /// Find a gated cfg determined by the `pred`icate which is given the cfg's name.
diff --git a/compiler/rustc_feature/src/unstable.rs b/compiler/rustc_feature/src/unstable.rs
index cbc121e3632..12e254ab549 100644
--- a/compiler/rustc_feature/src/unstable.rs
+++ b/compiler/rustc_feature/src/unstable.rs
@@ -205,6 +205,8 @@ declare_features! (
     (unstable, anonymous_lifetime_in_impl_trait, "1.63.0", None),
     /// Allows access to the emscripten_wasm_eh config, used by panic_unwind and unwind
     (internal, cfg_emscripten_wasm_eh, "1.86.0", None),
+    /// Allows checking whether or not the backend correctly supports unstable float types.
+    (internal, cfg_target_has_reliable_f16_f128, "CURRENT_RUSTC_VERSION", None),
     /// Allows identifying the `compiler_builtins` crate.
     (internal, compiler_builtins, "1.13.0", None),
     /// Allows writing custom MIR