mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-31 13:04:42 +00:00
29 lines
821 B
Rust
29 lines
821 B
Rust
// no-system-llvm
|
|
// compile-flags: -O
|
|
// ignore-debug: the debug assertions add extra comparisons
|
|
#![crate_type = "lib"]
|
|
|
|
type Demo = [u8; 3];
|
|
|
|
// CHECK-LABEL: @slice_iter_len_eq_zero
|
|
#[no_mangle]
|
|
pub fn slice_iter_len_eq_zero(y: std::slice::Iter<'_, Demo>) -> bool {
|
|
// CHECK-NOT: sub
|
|
// CHECK: %[[RET:.+]] = icmp eq ptr {{%1|%0}}, {{%1|%0}}
|
|
// CHECK: ret i1 %[[RET]]
|
|
y.len() == 0
|
|
}
|
|
|
|
// CHECK-LABEL: @array_into_iter_len_eq_zero
|
|
#[no_mangle]
|
|
pub fn array_into_iter_len_eq_zero(y: std::array::IntoIter<Demo, 123>) -> bool {
|
|
// This should be able to just check that the indexes are equal, and not
|
|
// need any subtractions or comparisons to handle `start > end`.
|
|
|
|
// CHECK-NOT: icmp
|
|
// CHECK-NOT: sub
|
|
// CHECK: %_0 = icmp eq {{i16|i32|i64}}
|
|
// CHECK: ret i1 %_0
|
|
y.len() == 0
|
|
}
|