31 lines
636 B
Rust
31 lines
636 B
Rust
// 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)
|
|
}
|
|
}
|
|
}
|