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// in Rust 1.73, -O and opt-level=3 optimizes differently
//@ compile-flags: -C opt-level=3
#![crate_type = "lib"]
use std::cmp::max;
// CHECK-LABEL: @foo
// CHECK-NOT: slice_start_index_len_fail
// CHECK-NOT: unreachable
#[no_mangle]
pub fn foo(v: &mut Vec<u8>, size: usize) -> Option<&mut [u8]> {
if v.len() > max(1, size) {
let start = v.len() - size;
Some(&mut v[start..])
} else {
None
}
}
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