mirror of https://github.com/rust-lang/rust
115 lines
3.9 KiB
Rust
115 lines
3.9 KiB
Rust
//@ compile-flags: -O
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#![crate_type = "lib"]
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#![feature(exact_size_is_empty)]
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// The slice iterator used to `assume` that the `start` pointer was non-null.
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// That ought to be unneeded, though, since the type is `NonNull`, so this test
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// confirms that the appropriate metadata is included to denote that.
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// It also used to `assume` the `end` pointer was non-null, but that's no longer
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// needed as the code changed to read it as a `NonNull`, and thus gets the
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// appropriate `!nonnull` annotations naturally.
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// CHECK-LABEL: @slice_iter_next(
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#[no_mangle]
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pub fn slice_iter_next<'a>(it: &mut std::slice::Iter<'a, u32>) -> Option<&'a u32> {
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// CHECK: %[[ENDP:.+]] = getelementptr inbounds i8, ptr %it, {{i32 4|i64 8}}
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// CHECK: %[[END:.+]] = load ptr, ptr %[[ENDP]]
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: %[[START:.+]] = load ptr, ptr %it,
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: icmp eq ptr %[[START]], %[[END]]
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// CHECK: store ptr{{.+}}, ptr %it,
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it.next()
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}
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// CHECK-LABEL: @slice_iter_next_back(
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#[no_mangle]
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pub fn slice_iter_next_back<'a>(it: &mut std::slice::Iter<'a, u32>) -> Option<&'a u32> {
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// CHECK: %[[ENDP:.+]] = getelementptr inbounds i8, ptr %it, {{i32 4|i64 8}}
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// CHECK: %[[END:.+]] = load ptr, ptr %[[ENDP]]
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: %[[START:.+]] = load ptr, ptr %it,
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: icmp eq ptr %[[START]], %[[END]]
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// CHECK: store ptr{{.+}}, ptr %[[ENDP]],
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it.next_back()
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}
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// The slice iterator `new` methods used to `assume` that the pointer is non-null,
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// but passing slices already requires that, to the extent that LLVM actually
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// removed the `call @llvm.assume` anyway. These tests just demonstrate that the
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// attribute is there, and confirms adding the assume back doesn't do anything.
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// CHECK-LABEL: @slice_iter_new
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// CHECK-SAME: (ptr noalias noundef nonnull {{.+}} %slice.0, {{.+}} noundef %slice.1)
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#[no_mangle]
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pub fn slice_iter_new(slice: &[u32]) -> std::slice::Iter<'_, u32> {
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// CHECK-NOT: slice
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// CHECK: %[[END:.+]] = getelementptr inbounds i32{{.+}} %slice.0{{.+}} %slice.1
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// CHECK-NOT: slice
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// CHECK: insertvalue {{.+}} ptr %slice.0, 0
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// CHECK-NOT: slice
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// CHECK: insertvalue {{.+}} ptr %[[END]], 1
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// CHECK-NOT: slice
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// CHECK: }
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slice.iter()
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}
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// CHECK-LABEL: @slice_iter_mut_new
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// CHECK-SAME: (ptr noalias noundef nonnull {{.+}} %slice.0, {{.+}} noundef %slice.1)
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#[no_mangle]
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pub fn slice_iter_mut_new(slice: &mut [u32]) -> std::slice::IterMut<'_, u32> {
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// CHECK-NOT: slice
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// CHECK: %[[END:.+]] = getelementptr inbounds i32{{.+}} %slice.0{{.+}} %slice.1
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// CHECK-NOT: slice
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// CHECK: insertvalue {{.+}} ptr %slice.0, 0
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// CHECK-NOT: slice
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// CHECK: insertvalue {{.+}} ptr %[[END]], 1
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// CHECK-NOT: slice
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// CHECK: }
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slice.iter_mut()
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}
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// CHECK-LABEL: @slice_iter_is_empty
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#[no_mangle]
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pub fn slice_iter_is_empty(it: &std::slice::Iter<'_, u32>) -> bool {
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// CHECK: %[[ENDP:.+]] = getelementptr inbounds i8, ptr %it, {{i32 4|i64 8}}
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// CHECK: %[[END:.+]] = load ptr, ptr %[[ENDP]]
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: %[[START:.+]] = load ptr, ptr %it,
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: %[[RET:.+]] = icmp eq ptr %[[START]], %[[END]]
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// CHECK: ret i1 %[[RET]]
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it.is_empty()
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}
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// CHECK-LABEL: @slice_iter_len
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#[no_mangle]
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pub fn slice_iter_len(it: &std::slice::Iter<'_, u32>) -> usize {
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// CHECK: %[[ENDP:.+]] = getelementptr inbounds i8, ptr %it, {{i32 4|i64 8}}
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// CHECK: %[[END:.+]] = load ptr, ptr %[[ENDP]]
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: %[[START:.+]] = load ptr, ptr %it,
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: ptrtoint
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// CHECK: ptrtoint
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// CHECK: sub nuw
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// CHECK: lshr exact
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it.len()
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}
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