Default to Cranelift newBE

Author: bjorn3

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
         env:
           - BACKEND: ""
-          - BACKEND: --features newbe
+          - BACKEND: --oldbe
 
     steps:
     - uses: actions/checkout@v2

Cargo.toml

@@ -37,7 +37,7 @@ libloading = { version = "0.6.0", optional = true }
 default = ["jit", "inline_asm"]
 jit = ["cranelift-jit", "libloading"]
 inline_asm = []
-newbe = []
+oldbe = []
 
 [profile.dev]
 # By compiling dependencies with optimizations, performing tests gets much faster.

build.sh

@@ -5,7 +5,7 @@ set -e
 export CHANNEL="release"
 build_sysroot=1
 target_dir='build'
-newbe=''
+oldbe=''
 while [[ $# != 0 ]]; do
     case $1 in
         "--debug")
@@ -18,12 +18,13 @@ while [[ $# != 0 ]]; do
             target_dir=$2
             shift
             ;;
-        "--newbe")
-            newbe='--features newbe'
+        "--oldbe")
+            oldbe='--features oldbe'
             ;;
         *)
             echo "Unknown flag '$1'"
-            echo "Usage: ./build.sh [--debug] [--without-sysroot] [--target-dir DIR] [--newbe]"
+            echo "Usage: ./build.sh [--debug] [--without-sysroot] [--target-dir DIR] [--oldbe]"
+            exit 1
             ;;
     esac
     shift
@@ -43,9 +44,9 @@ else
    exit 1
 fi
 if [[ "$CHANNEL" == "release" ]]; then
-    cargo build $newbe --release
+    cargo build $oldbe --release
 else
-    cargo build $newbe
+    cargo build $oldbe
 fi
 
 rm -rf "$target_dir"

src/lib.rs

@@ -339,10 +339,10 @@ fn build_isa(sess: &Session) -> Box<dyn isa::TargetIsa + 'static> {
 
     let flags = settings::Flags::new(flags_builder);
 
-    let variant = if cfg!(feature = "newbe") {
-        cranelift_codegen::isa::BackendVariant::MachInst
-    } else {
+    let variant = if cfg!(feature = "oldbe") {
         cranelift_codegen::isa::BackendVariant::Legacy
+    } else {
+        cranelift_codegen::isa::BackendVariant::MachInst
     };
     let mut isa_builder = cranelift_codegen::isa::lookup_variant(target_triple, variant).unwrap();
     // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`