4 files changed, 9 insertions, 51 deletions

diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs
index 87bcce07b34..e06e2d45665 100644
--- a/compiler/rustc_codegen_llvm/src/attributes.rs
+++ b/compiler/rustc_codegen_llvm/src/attributes.rs
@@ -144,25 +144,6 @@ fn set_probestack(cx: &CodegenCx<'ll, '_>, llfn: &'ll Value) {
     );
 }
 
-fn translate_obsolete_target_features(feature: &str) -> &str {
-    const LLVM9_FEATURE_CHANGES: &[(&str, &str)] =
-        &[("+fp-only-sp", "-fp64"), ("-fp-only-sp", "+fp64"), ("+d16", "-d32"), ("-d16", "+d32")];
-    if llvm_util::get_major_version() >= 9 {
-        for &(old, new) in LLVM9_FEATURE_CHANGES {
-            if feature == old {
-                return new;
-            }
-        }
-    } else {
-        for &(old, new) in LLVM9_FEATURE_CHANGES {
-            if feature == new {
-                return old;
-            }
-        }
-    }
-    feature
-}
-
 pub fn llvm_target_features(sess: &Session) -> impl Iterator<Item = &str> {
     const RUSTC_SPECIFIC_FEATURES: &[&str] = &["crt-static"];
 
@@ -172,12 +153,7 @@ pub fn llvm_target_features(sess: &Session) -> impl Iterator<Item = &str> {
         .target_feature
         .split(',')
         .filter(|f| !RUSTC_SPECIFIC_FEATURES.iter().any(|s| f.contains(s)));
-    sess.target
-        .features
-        .split(',')
-        .chain(cmdline)
-        .filter(|l| !l.is_empty())
-        .map(translate_obsolete_target_features)
+    sess.target.features.split(',').chain(cmdline).filter(|l| !l.is_empty())
 }
 
 pub fn apply_target_cpu_attr(cx: &CodegenCx<'ll, '_>, llfn: &'ll Value) {
diff --git a/compiler/rustc_codegen_llvm/src/back/write.rs b/compiler/rustc_codegen_llvm/src/back/write.rs
index 6237a4c0020..6f956c3bcc1 100644
--- a/compiler/rustc_codegen_llvm/src/back/write.rs
+++ b/compiler/rustc_codegen_llvm/src/back/write.rs
@@ -377,11 +377,6 @@ fn get_pgo_use_path(config: &ModuleConfig) -> Option<CString> {
 }
 
 pub(crate) fn should_use_new_llvm_pass_manager(config: &ModuleConfig) -> bool {
-    // We only support the new pass manager starting with LLVM 9.
-    if llvm_util::get_major_version() < 9 {
-        return false;
-    }
-
     // The new pass manager is disabled by default.
     config.new_llvm_pass_manager
 }
diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
index b6e922ca545..8dd40308075 100644
--- a/compiler/rustc_codegen_llvm/src/context.rs
+++ b/compiler/rustc_codegen_llvm/src/context.rs
@@ -100,11 +100,6 @@ fn to_llvm_tls_model(tls_model: TlsModel) -> llvm::ThreadLocalMode {
     }
 }
 
-fn strip_function_ptr_alignment(data_layout: String) -> String {
-    // FIXME: Make this more general.
-    data_layout.replace("-Fi8-", "-")
-}
-
 fn strip_x86_address_spaces(data_layout: String) -> String {
     data_layout.replace("-p270:32:32-p271:32:32-p272:64:64-", "-")
 }
@@ -119,9 +114,6 @@ pub unsafe fn create_module(
     let llmod = llvm::LLVMModuleCreateWithNameInContext(mod_name.as_ptr(), llcx);
 
     let mut target_data_layout = sess.target.data_layout.clone();
-    if llvm_util::get_major_version() < 9 {
-        target_data_layout = strip_function_ptr_alignment(target_data_layout);
-    }
     if llvm_util::get_major_version() < 10
         && (sess.target.arch == "x86" || sess.target.arch == "x86_64")
     {
diff --git a/compiler/rustc_codegen_llvm/src/llvm_util.rs b/compiler/rustc_codegen_llvm/src/llvm_util.rs
index ab70f72dc61..a8a1646183c 100644
--- a/compiler/rustc_codegen_llvm/src/llvm_util.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm_util.rs
@@ -3,7 +3,6 @@ use crate::llvm;
 use libc::c_int;
 use rustc_codegen_ssa::target_features::supported_target_features;
 use rustc_data_structures::fx::FxHashSet;
-use rustc_feature::UnstableFeatures;
 use rustc_middle::bug;
 use rustc_session::config::PrintRequest;
 use rustc_session::Session;
@@ -104,7 +103,7 @@ unsafe fn configure_llvm(sess: &Session) {
         }
     }
 
-    if sess.opts.debugging_opts.llvm_time_trace && get_major_version() >= 9 {
+    if sess.opts.debugging_opts.llvm_time_trace {
         // time-trace is not thread safe and running it in parallel will cause seg faults.
         if !sess.opts.debugging_opts.no_parallel_llvm {
             bug!("`-Z llvm-time-trace` requires `-Z no-parallel-llvm")
@@ -122,10 +121,8 @@ unsafe fn configure_llvm(sess: &Session) {
 
 pub fn time_trace_profiler_finish(file_name: &str) {
     unsafe {
-        if get_major_version() >= 9 {
-            let file_name = CString::new(file_name).unwrap();
-            llvm::LLVMTimeTraceProfilerFinish(file_name.as_ptr());
-        }
+        let file_name = CString::new(file_name).unwrap();
+        llvm::LLVMTimeTraceProfilerFinish(file_name.as_ptr());
     }
 }
 
@@ -149,13 +146,11 @@ pub fn target_features(sess: &Session) -> Vec<Symbol> {
     let target_machine = create_informational_target_machine(sess);
     supported_target_features(sess)
         .iter()
-        .filter_map(|&(feature, gate)| {
-            if UnstableFeatures::from_environment().is_nightly_build() || gate.is_none() {
-                Some(feature)
-            } else {
-                None
-            }
-        })
+        .filter_map(
+            |&(feature, gate)| {
+                if sess.is_nightly_build() || gate.is_none() { Some(feature) } else { None }
+            },
+        )
         .filter(|feature| {
             let llvm_feature = to_llvm_feature(sess, feature);
             let cstr = CString::new(llvm_feature).unwrap();