Merge commit '3a31c6d8272c14388a34622193baf553636fe470' into sync_cg_clif-2021-07-07

1 files changed, 9 insertions, 5 deletions

diff --git a/compiler/rustc_codegen_cranelift/src/lib.rs b/compiler/rustc_codegen_cranelift/src/lib.rs
index ebf98e8694b..cb1cb3c74db 100644
--- a/compiler/rustc_codegen_cranelift/src/lib.rs
+++ b/compiler/rustc_codegen_cranelift/src/lib.rs
@@ -1,4 +1,4 @@
-#![feature(rustc_private, decl_macro, never_type, hash_drain_filter, vec_into_raw_parts)]
+#![feature(rustc_private, decl_macro, never_type, hash_drain_filter, vec_into_raw_parts, once_cell)]
 #![warn(rust_2018_idioms)]
 #![warn(unused_lifetimes)]
 #![warn(unreachable_pub)]
@@ -14,7 +14,9 @@ extern crate rustc_fs_util;
 extern crate rustc_hir;
 extern crate rustc_incremental;
 extern crate rustc_index;
+extern crate rustc_interface;
 extern crate rustc_metadata;
+extern crate rustc_mir;
 extern crate rustc_session;
 extern crate rustc_span;
 extern crate rustc_target;
@@ -284,10 +286,12 @@ fn build_isa(sess: &Session, backend_config: &BackendConfig) -> Box<dyn isa::Tar
         }
         None => {
             let mut builder =
-                cranelift_codegen::isa::lookup_variant(target_triple, variant).unwrap();
-            // Don't use "haswell" as the default, as it implies `has_lzcnt`.
-            // macOS CI is still at Ivy Bridge EP, so `lzcnt` is interpreted as `bsr`.
-            builder.enable("nehalem").unwrap();
+                cranelift_codegen::isa::lookup_variant(target_triple.clone(), variant).unwrap();
+            if target_triple.architecture == target_lexicon::Architecture::X86_64 {
+                // Don't use "haswell" as the default, as it implies `has_lzcnt`.
+                // macOS CI is still at Ivy Bridge EP, so `lzcnt` is interpreted as `bsr`.
+                builder.enable("nehalem").unwrap();
+            }
             builder
         }
     };