File: issue_75439.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, 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 (16 lines) | stat: -rw-r--r-- 432 bytes parent folder | download | duplicates (4) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
 
// skip-filecheck
// EMIT_MIR issue_75439.foo.MatchBranchSimplification.diff
//@ ignore-endian-big

use std::mem::transmute;

pub fn foo(bytes: [u8; 16]) -> Option<[u8; 4]> {
    // big endian `u32`s
    let dwords: [u32; 4] = unsafe { transmute(bytes) };
    const FF: u32 = 0x0000_ffff_u32.to_be();
    if let [0, 0, 0 | FF, ip] = dwords { Some(unsafe { transmute(ip) }) } else { None }
}

fn main() {
    let _ = foo([0; 16]);
}