mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-30 10:45:18 +00:00
29 lines
979 B
Rust
29 lines
979 B
Rust
// With -Zub-checks=yes (enabled by default by -Cdebug-assertions=yes) we will produce a runtime
|
|
// check that the index to slice::get_unchecked is in-bounds of the slice. That is tested for by
|
|
// tests/ui/precondition-checks/out-of-bounds-get-unchecked.rs
|
|
//
|
|
// This test ensures that such a runtime check is *not* emitted when debug-assertions are enabled,
|
|
// but ub-checks are explicitly disabled.
|
|
|
|
//@ revisions: DEBUG NOCHECKS
|
|
//@ [DEBUG] compile-flags:
|
|
//@ [NOCHECKS] compile-flags: -Zub-checks=no
|
|
//@ compile-flags: -O -Cdebug-assertions=yes
|
|
|
|
#![crate_type = "lib"]
|
|
|
|
use std::ops::Range;
|
|
|
|
// CHECK-LABEL: @slice_get_unchecked(
|
|
#[no_mangle]
|
|
pub unsafe fn slice_get_unchecked(x: &[i32], i: usize) -> &i32 {
|
|
// CHECK: icmp ult
|
|
// NOCHECKS: tail call void @llvm.assume
|
|
// DEBUG: br i1
|
|
// DEBUG: call core::panicking::panic_nounwind
|
|
// DEBUG: unreachable
|
|
// CHECK: getelementptr inbounds
|
|
// CHECK: ret ptr
|
|
x.get_unchecked(i)
|
|
}
|