24 lines
536 B
Rust
24 lines
536 B
Rust
#[no_mangle]
|
|
pub fn cold_function(c: u8) {
|
|
println!("cold {}", c);
|
|
}
|
|
|
|
#[no_mangle]
|
|
pub fn hot_function(c: u8) {
|
|
std::env::set_var(format!("var{}", c), format!("hot {}", c));
|
|
}
|
|
|
|
fn main() {
|
|
let arg = std::env::args().skip(1).next().unwrap();
|
|
|
|
for i in 0 .. 1000_000 {
|
|
let some_value = arg.as_bytes()[i % arg.len()];
|
|
if some_value == b'!' {
|
|
// This branch is never taken at runtime
|
|
cold_function(some_value);
|
|
} else {
|
|
hot_function(some_value);
|
|
}
|
|
}
|
|
}
|