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