1 files changed, 17 insertions, 18 deletions
diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs
index f02c30c3ee3..f1fa9864616 100644
--- a/compiler/rustc_codegen_llvm/src/attributes.rs
+++ b/compiler/rustc_codegen_llvm/src/attributes.rs
@@ -6,7 +6,7 @@ use rustc_codegen_ssa::traits::*;
 use rustc_data_structures::const_cstr;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::small_c_str::SmallCStr;
-use rustc_hir::def_id::{DefId, LOCAL_CRATE};
+use rustc_hir::def_id::DefId;
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
 use rustc_middle::ty::layout::HasTyCtxt;
 use rustc_middle::ty::query::Providers;
@@ -194,6 +194,18 @@ pub fn apply_target_cpu_attr(cx: &CodegenCx<'ll, '_>, llfn: &'ll Value) {
     );
 }
 
+pub fn apply_tune_cpu_attr(cx: &CodegenCx<'ll, '_>, llfn: &'ll Value) {
+    if let Some(tune) = llvm_util::tune_cpu(cx.tcx.sess) {
+        let tune_cpu = SmallCStr::new(tune);
+        llvm::AddFunctionAttrStringValue(
+            llfn,
+            llvm::AttributePlace::Function,
+            const_cstr!("tune-cpu"),
+            tune_cpu.as_c_str(),
+        );
+    }
+}
+
 /// Sets the `NonLazyBind` LLVM attribute on a given function,
 /// assuming the codegen options allow skipping the PLT.
 pub fn non_lazy_bind(sess: &Session, llfn: &'ll Value) {
@@ -303,6 +315,9 @@ pub fn from_fn_attrs(cx: &CodegenCx<'ll, 'tcx>, llfn: &'ll Value, instance: ty::
     // Without this, ThinLTO won't inline Rust functions into Clang generated
     // functions (because Clang annotates functions this way too).
     apply_target_cpu_attr(cx, llfn);
+    // tune-cpu is only conveyed through the attribute for our purpose.
+    // The target doesn't care; the subtarget reads our attribute.
+    apply_tune_cpu_attr(cx, llfn);
 
     let features = llvm_target_features(cx.tcx.sess)
         .map(|s| s.to_string())
@@ -352,23 +367,7 @@ pub fn from_fn_attrs(cx: &CodegenCx<'ll, 'tcx>, llfn: &'ll Value, instance: ty::
     }
 }
 
-pub fn provide(providers: &mut Providers) {
-    use rustc_codegen_ssa::target_features::{all_known_features, supported_target_features};
-    providers.supported_target_features = |tcx, cnum| {
-        assert_eq!(cnum, LOCAL_CRATE);
-        if tcx.sess.opts.actually_rustdoc {
-            // rustdoc needs to be able to document functions that use all the features, so
-            // provide them all.
-            all_known_features().map(|(a, b)| (a.to_string(), b)).collect()
-        } else {
-            supported_target_features(tcx.sess).iter().map(|&(a, b)| (a.to_string(), b)).collect()
-        }
-    };
-
-    provide_extern(providers);
-}
-
-pub fn provide_extern(providers: &mut Providers) {
+pub fn provide_both(providers: &mut Providers) {
     providers.wasm_import_module_map = |tcx, cnum| {
         // Build up a map from DefId to a `NativeLib` structure, where
         // `NativeLib` internally contains information about