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another noalias fix

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nora 2022-07-22 16:18:38 +02:00
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content/posts/box-is-a-unique-type.md
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@ -87,7 +87,7 @@ define void @takes_box_and_ptr_to_it(i8* noalias %0, i8* %ptr) {
See the little attribute on the first parameter called `noalias`? That's what's doing the magic here. See the little attribute on the first parameter called `noalias`? That's what's doing the magic here.
`noalias` is an LLVM attribute on pointers that allows for various optimizations. If there are two pointers, `noalias` is an LLVM attribute on pointers that allows for various optimizations. If there are two pointers,
and at least one of them is `noalias`, there are some restrictions around the two: and at least one of them is `noalias`, there are some restrictions around the two. Approximately:
- If one of them writes, they must not point to the same value (alias each other) - If one of them writes, they must not point to the same value (alias each other)
- If neither of them writes, they can alias just fine. - If neither of them writes, they can alias just fine.
Therefore, we also apply `noalias` to `&mut T` and `&T` (if it doesn't contain interior mutability through Therefore, we also apply `noalias` to `&mut T` and `&T` (if it doesn't contain interior mutability through