File: uninit-repeat-in-aggregate.rs

package info (click to toggle)
rustc 1.88.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 934,128 kB
  • sloc: xml: 158,127; python: 36,062; javascript: 19,855; sh: 19,700; cpp: 18,947; ansic: 12,993; asm: 4,792; makefile: 690; lisp: 29; perl: 29; ruby: 19; sql: 11
file content (21 lines) | stat: -rw-r--r-- 521 bytes parent folder | download | duplicates (9)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
//@ compile-flags: -Copt-level=3

#![crate_type = "lib"]

use std::mem::MaybeUninit;

// We need to make sure len is at offset 0, otherwise codegen needs an extra instruction
#[repr(C)]
pub struct SmallVec<T> {
    pub len: u64,
    pub arr: [MaybeUninit<T>; 24],
}

// CHECK-LABEL: @uninit_arr_via_const
#[no_mangle]
pub fn uninit_arr_via_const() -> SmallVec<String> {
    // CHECK-NEXT: start:
    // CHECK-NEXT: store i64 0,
    // CHECK-NEXT: ret
    SmallVec { len: 0, arr: [const { MaybeUninit::uninit() }; 24] }
}