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Auto merge of #96946 - WaffleLapkin:ptr_mask, r=scottmcm

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Add pointer masking convenience functions

This PR adds the following public API:
```rust
impl<T: ?Sized> *const T {
    fn mask(self, mask: usize) -> *const T;
}

impl<T: ?Sized> *mut T {
    fn mask(self, mask: usize) -> *const T;
}

// mod intrinsics
fn mask<T>(ptr: *const T, mask: usize) -> *const T
```
This is equivalent to `ptr.map_addr(|a| a & mask)` but also uses a cool llvm intrinsic.

Proposed in https://github.com/rust-lang/rust/pull/95643#issuecomment-1121562352

cc `@Gankra` `@scottmcm` `@RalfJung`

r? rust-lang/libs-api
This commit is contained in:
bors 2022-08-28 01:34:47 +00:00
commit 1e978a3627
10 changed files with 87 additions and 1 deletions
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1
compiler/rustc_span/src/symbol.rs
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@ -1114,6 +1114,7 @@ symbols! {
ptr,
ptr_guaranteed_eq,
ptr_guaranteed_ne,
ptr_mask,
ptr_null,
ptr_null_mut,
ptr_offset_from,