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// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
//@ test-mir-pass: GVN
//@ compile-flags: -Zmir-enable-passes=+LowerSliceLenCalls
// EMIT_MIR lower_array_len.array_bound.GVN.diff
pub fn array_bound<const N: usize>(index: usize, slice: &[u8; N]) -> u8 {
// CHECK-LABEL: fn array_bound(
// CHECK-NOT: Lt
// CHECK: Lt(copy _1, const N);
// CHECK-NOT: Lt
if index < slice.len() { slice[index] } else { 42 }
}
// EMIT_MIR lower_array_len.array_bound_mut.GVN.diff
pub fn array_bound_mut<const N: usize>(index: usize, slice: &mut [u8; N]) -> u8 {
// CHECK-LABEL: fn array_bound_mut(
// CHECK-NOT: Lt
// CHECK: Lt(copy _1, const N);
// CHECK-NOT: Lt
// CHECK: Lt(const 0_usize, const N)
// CHECK-NOT: Lt
if index < slice.len() {
slice[index]
} else {
slice[0] = 42;
42
}
}
// EMIT_MIR lower_array_len.array_len.GVN.diff
pub fn array_len<const N: usize>(arr: &[u8; N]) -> usize {
// CHECK-LABEL: fn array_len(
// CHECK: _0 = const N;
arr.len()
}
// EMIT_MIR lower_array_len.array_len_by_value.GVN.diff
pub fn array_len_by_value<const N: usize>(arr: [u8; N]) -> usize {
// CHECK-LABEL: fn array_len_by_value(
// CHECK: _0 = const N;
arr.len()
}
// EMIT_MIR lower_array_len.array_len_reborrow.GVN.diff
pub fn array_len_reborrow<const N: usize>(mut arr: [u8; N]) -> usize {
// CHECK-LABEL: fn array_len_reborrow(
// CHECK: _0 = const N;
let arr: &mut [_] = &mut arr;
let arr = &*arr;
arr.len()
}
// EMIT_MIR lower_array_len.array_len_raw.GVN.diff
pub fn array_len_raw<const N: usize>(arr: [u8; N]) -> usize {
// CHECK-LABEL: fn array_len_raw(
// CHECK: _0 = const N;
let arr: &[_] = &arr;
let arr = std::ptr::addr_of!(*arr);
unsafe { &*arr }.len()
}
fn main() {
let _ = array_bound(3, &[0, 1, 2, 3]);
let mut tmp = [0, 1, 2, 3, 4];
let _ = array_bound_mut(3, &mut [0, 1, 2, 3]);
let _ = array_len(&[0]);
let _ = array_len_by_value([0, 2]);
let _ = array_len_reborrow([0, 2]);
let _ = array_len_raw([0, 2]);
}
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