From b778f7fa0192ac6863f3ce0ab49d9c4001bf5503 Mon Sep 17 00:00:00 2001
From: Sean McArthur <sean.monstar@gmail.com>
Date: Wed, 31 Aug 2016 16:02:55 -0700
Subject: core: add likely and unlikely intrinsics

---
 src/test/codegen/likely.rs | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/test/codegen/likely.rs

(limited to 'src/test/codegen')

diff --git a/src/test/codegen/likely.rs b/src/test/codegen/likely.rs
new file mode 100644
index 00000000000..acaec0350bf
--- /dev/null
+++ b/src/test/codegen/likely.rs
@@ -0,0 +1,41 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags: -C no-prepopulate-passes
+
+#![crate_type = "lib"]
+#![feature(core_intrinsics)]
+
+use std::intrinsics::{likely,unlikely};
+
+#[no_mangle]
+pub fn check_likely(x: i32, y: i32) -> Option<i32> {
+    unsafe {
+        // CHECK: call i1 @llvm.expect.i1(i1 %{{.*}}, i1 true)
+        if likely(x == y) {
+            None
+        } else {
+            Some(x + y)
+        }
+    }
+}
+
+#[no_mangle]
+pub fn check_unlikely(x: i32, y: i32) -> Option<i32> {
+    unsafe {
+        // CHECK: call i1 @llvm.expect.i1(i1 %{{.*}}, i1 false)
+        if unlikely(x == y) {
+            None
+        } else {
+            Some(x + y)
+        }
+    }
+}
+
-- 
cgit 1.4.1-3-g733a5