mirror of
https://github.com/rust-lang/rust.git
synced 2025-11-30 23:28:25 +00:00
163594c8f8
Add codegen test for issue where `valid_index.saturating_sub(X)` produced an extra bounds check. This was fixed by the LLVM upgrade.
20 lines
497 B
Rust
20 lines
497 B
Rust
// Test that calculating an index with saturating subtraction from an in-bounds
|
|
// index doesn't generate another bounds check.
|
|
|
|
//@ compile-flags: -Copt-level=3
|
|
//@ min-llvm-version: 21
|
|
|
|
#![crate_type = "lib"]
|
|
|
|
// CHECK-LABEL: @bounds_check_is_elided
|
|
#[no_mangle]
|
|
pub fn bounds_check_is_elided(s: &[i32], index: usize) -> i32 {
|
|
// CHECK-NOT: panic_bounds_check
|
|
if index < s.len() {
|
|
let lower_bound = index.saturating_sub(1);
|
|
s[lower_bound]
|
|
} else {
|
|
-1
|
|
}
|
|
}
|