mirror of
https://github.com/rust-lang/rust.git
synced 2024-10-30 22:12:15 +00:00
27 lines
661 B
Rust
27 lines
661 B
Rust
|
//@ compile-flags: -O
|
||
|
|
|
||
|
|
#![crate_type = "lib"]
|
||
|
|
|
||
|
|
use std::iter::StepBy;
|
||
|
|
use std::slice::Iter;
|
||
|
|
|
||
|
|
// The constructor for `StepBy` ensures we can never end up needing to do zero
|
||
|
|
// checks on denominators, so check that the code isn't emitting panic paths.
|
||
|
|
|
||
|
|
// CHECK-LABEL: @step_by_len_std
|
||
|
|
#[no_mangle]
|
||
|
|
pub fn step_by_len_std(x: &StepBy<Iter<i32>>) -> usize {
|
||
|
|
// CHECK-NOT: div_by_zero
|
||
|
|
// CHECK: udiv
|
||
|
|
// CHECK-NOT: div_by_zero
|
||
|
|
x.len()
|
||
|
|
}
|
||
|
|
|
||
|
|
// CHECK-LABEL: @step_by_len_naive
|
||
|
|
#[no_mangle]
|
||
|
|
pub fn step_by_len_naive(x: Iter<i32>, step_minus_one: usize) -> usize {
|
||
|
|
// CHECK: udiv
|
||
|
|
// CHECK: call{{.+}}div_by_zero
|
||
|
|
x.len() / (step_minus_one + 1)
|
||
|
|
}
|