diff options
| author | bors <bors@rust-lang.org> | 2022-08-28 01:34:47 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2022-08-28 01:34:47 +0000 |
| commit | 1e978a3627bd65064164af3548c585fb25eef9d2 (patch) | |
| tree | d36b93e40e37cd26a0f15a200435c511ed21c0bd /compiler/rustc_codegen_llvm/src/context.rs | |
| parent | eaadb8947b850a025404082f6297766c4680a42a (diff) | |
| parent | ca753124088c0d57ca6728ee093363cbc1db5274 (diff) | |
| download | rust-1e978a3627bd65064164af3548c585fb25eef9d2.tar.gz rust-1e978a3627bd65064164af3548c585fb25eef9d2.zip | |
Auto merge of #96946 - WaffleLapkin:ptr_mask, r=scottmcm
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
Diffstat (limited to 'compiler/rustc_codegen_llvm/src/context.rs')
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/context.rs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs index d4d84147239..67ffc7cb951 100644 --- a/compiler/rustc_codegen_llvm/src/context.rs +++ b/compiler/rustc_codegen_llvm/src/context.rs @@ -886,6 +886,9 @@ impl<'ll> CodegenCx<'ll, '_> { ifn!("llvm.dbg.declare", fn(t_metadata, t_metadata) -> void); ifn!("llvm.dbg.value", fn(t_metadata, t_i64, t_metadata) -> void); } + + ifn!("llvm.ptrmask", fn(i8p, t_isize) -> i8p); + None } |