rust/tests/codegen/intrinsics/likely.rs

//@ compile-flags: -C no-prepopulate-passes -Copt-level=1

#![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) }
    }
}