mirror of https://github.com/rust-lang/rust.git
36 lines
1.2 KiB
Rust
36 lines
1.2 KiB
Rust
// compile-flags: -O -Zmerge-functions=disabled
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// ignore-32bit LLVM has a bug with them
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// ignore-debug
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// Check that LLVM understands that `Iter` pointer is not null. Issue #37945.
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#![crate_type = "lib"]
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use std::slice::Iter;
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#[no_mangle]
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pub fn is_empty_1(xs: Iter<f32>) -> bool {
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// CHECK-LABEL: @is_empty_1(
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// CHECK-NEXT: start:
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// CHECK-NEXT: [[A:%.*]] = icmp ne ptr {{%xs.0|%xs.1}}, null
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// CHECK-NEXT: tail call void @llvm.assume(i1 [[A]])
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// The order between %xs.0 and %xs.1 on the next line doesn't matter
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// and different LLVM versions produce different order.
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// CHECK-NEXT: [[B:%.*]] = icmp eq ptr {{%xs.0, %xs.1|%xs.1, %xs.0}}
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// CHECK-NEXT: ret i1 [[B:%.*]]
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{xs}.next().is_none()
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}
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#[no_mangle]
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pub fn is_empty_2(xs: Iter<f32>) -> bool {
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// CHECK-LABEL: @is_empty_2
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// CHECK-NEXT: start:
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// CHECK-NEXT: [[C:%.*]] = icmp ne ptr {{%xs.0|%xs.1}}, null
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// CHECK-NEXT: tail call void @llvm.assume(i1 [[C]])
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// The order between %xs.0 and %xs.1 on the next line doesn't matter
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// and different LLVM versions produce different order.
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// CHECK-NEXT: [[D:%.*]] = icmp eq ptr {{%xs.0, %xs.1|%xs.1, %xs.0}}
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// CHECK-NEXT: ret i1 [[D:%.*]]
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xs.map(|&x| x).next().is_none()
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}
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