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28 lines
803 B
Rust
28 lines
803 B
Rust
// compile-flags: -O
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// ignore-debug: the debug assertions add extra comparisons
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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 {{%1|%0}}, {{%1|%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: @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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