1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
//@ compile-flags: -Copt-level=3
#![crate_type = "lib"]
#![feature(cold_path)]
use std::hint::cold_path;
#[inline(never)]
#[no_mangle]
pub fn path_a() {
println!("path a");
}
#[inline(never)]
#[no_mangle]
pub fn path_b() {
println!("path b");
}
#[no_mangle]
pub fn test1(x: bool) {
if x {
path_a();
} else {
cold_path();
path_b();
}
// CHECK-LABEL: @test1(
// CHECK: br i1 %x, label %bb1, label %bb2, !prof ![[NUM:[0-9]+]]
// CHECK: bb2:
// CHECK: path_b
// CHECK: bb1:
// CHECK: path_a
}
#[no_mangle]
pub fn test2(x: i32) {
match x > 0 {
true => path_a(),
false => {
cold_path();
path_b()
}
}
// CHECK-LABEL: @test2(
// CHECK: br i1 %_2, label %bb2, label %bb1, !prof ![[NUM]]
// CHECK: bb1:
// CHECK: path_b
// CHECK: bb2:
// CHECK: path_a
}
// CHECK: ![[NUM]] = !{!"branch_weights", {{(!"expected", )?}}i32 2000, i32 1}
|
