File: niche-prefer-zero.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, forky, sid, trixie
  • size: 893,396 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,051; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (25 lines) | stat: -rw-r--r-- 485 bytes parent folder | download | duplicates (6) 
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
 
// Check that niche selection prefers zero and that jumps are optimized away.
// See https://github.com/rust-lang/rust/pull/87794
//@ assembly-output: emit-asm
//@ only-x86
//@ compile-flags: -Copt-level=3

#![crate_type = "lib"]

#[repr(u8)]
pub enum Size {
    One = 1,
    Two = 2,
    Three = 3,
}

#[no_mangle]
pub fn handle(x: Option<Size>) -> u8 {
    match x {
        None => 0,
        Some(size) => size as u8,
    }
}

// There should be no jumps in output
// CHECK-NOT: j