| // 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) |
| } |
| } |
| } |
| |