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61 lines
1.7 KiB
Rust
61 lines
1.7 KiB
Rust
//@ compile-flags: -Copt-level=3
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//@ needs-deterministic-layouts (opposite scalar pair orders breaks it)
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#![crate_type = "lib"]
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type Demo = [u8; 3];
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// CHECK-LABEL: @slice_iter_len_eq_zero
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#[no_mangle]
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pub fn slice_iter_len_eq_zero(y: std::slice::Iter<'_, Demo>) -> bool {
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// CHECK-NOT: sub
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// CHECK: %[[RET:.+]] = icmp eq ptr {{%y.0, %y.1|%y.1, %y.0}}
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// CHECK: ret i1 %[[RET]]
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y.len() == 0
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}
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// CHECK-LABEL: @slice_iter_len_eq_zero_ref
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#[no_mangle]
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pub fn slice_iter_len_eq_zero_ref(y: &mut std::slice::Iter<'_, Demo>) -> bool {
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// CHECK-NOT: sub
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// CHECK: %[[A:.+]] = load ptr
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// CHECK-SAME: !nonnull
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// CHECK: %[[B:.+]] = load ptr
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// CHECK-SAME: !nonnull
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// CHECK: %[[RET:.+]] = icmp eq ptr %[[A]], %[[B]]
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// CHECK: ret i1 %[[RET]]
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y.len() == 0
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}
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struct MyZST;
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// CHECK-LABEL: @slice_zst_iter_len_eq_zero
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#[no_mangle]
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pub fn slice_zst_iter_len_eq_zero(y: std::slice::Iter<'_, MyZST>) -> bool {
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// CHECK: %[[RET:.+]] = icmp eq ptr %y.1, null
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// CHECK: ret i1 %[[RET]]
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y.len() == 0
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}
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// CHECK-LABEL: @slice_zst_iter_len_eq_zero_ref
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#[no_mangle]
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pub fn slice_zst_iter_len_eq_zero_ref(y: &mut std::slice::Iter<'_, MyZST>) -> bool {
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// CHECK: %[[LEN:.+]] = load ptr
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// CHECK-NOT: !nonnull
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// CHECK: %[[RET:.+]] = icmp eq ptr %[[LEN]], null
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// CHECK: ret i1 %[[RET]]
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y.len() == 0
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}
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// CHECK-LABEL: @array_into_iter_len_eq_zero
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#[no_mangle]
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pub fn array_into_iter_len_eq_zero(y: std::array::IntoIter<Demo, 123>) -> bool {
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// This should be able to just check that the indexes are equal, and not
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// need any subtractions or comparisons to handle `start > end`.
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// CHECK-NOT: icmp
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// CHECK-NOT: sub
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// CHECK: %_0 = icmp eq {{i16|i32|i64}}
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// CHECK: ret i1 %_0
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y.len() == 0
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}
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