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// 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: %2 = icmp eq {{i8\*|ptr}} {{%1|%0}}, {{%1|%0}}
// CHECK: ret i1 %2
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: %1 = icmp eq {{i16|i32|i64}}
// CHECK: ret i1 %1
y.len() == 0
}
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