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Rollup merge of #122232 - RalfJung:misc, r=jhpratt

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library/core: fix a comment, and a cfg(miri) warning

Just two things I noticed while working on another PR.
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Matthias Krüger 2024-03-09 16:21:20 +01:00 • committed by GitHub
commit 2bb4b9901f
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3 changed files with 7 additions and 6 deletions
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1
library/core/src/intrinsics.rs
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@ -3120,6 +3120,7 @@ pub(crate) const fn miri_promise_symbolic_alignment(ptr: *const (), align: usize
const fn compiletime(_ptr: *const (), _align: usize) {}
#[cfg_attr(not(bootstrap), allow(unused_unsafe))] // on bootstrap bump, remove unsafe block
// SAFETY: the extra behavior at runtime is for UB checks only.
unsafe {
const_eval_select((ptr, align), compiletime, runtime);

6
library/core/src/ptr/const_ptr.rs
View file

@ -1628,12 +1628,12 @@ impl<T: ?Sized> *const T {
#[inline]
const fn const_impl(ptr: *const (), align: usize) -> bool {
// We can't use the address of `self` in a `const fn`, so we use `align_offset` instead.
// The cast to `()` is used to
// 1. deal with fat pointers; and
// 2. ensure that `align_offset` doesn't actually try to compute an offset.
ptr.align_offset(align) == 0
}
// The cast to `()` is used to
// 1. deal with fat pointers; and
// 2. ensure that `align_offset` (in `const_impl`) doesn't actually try to compute an offset.
#[cfg_attr(not(bootstrap), allow(unused_unsafe))] // on bootstrap bump, remove unsafe block
// SAFETY: The two versions are equivalent at runtime.
unsafe {

6
library/core/src/ptr/mut_ptr.rs
View file

@ -1900,12 +1900,12 @@ impl<T: ?Sized> *mut T {
#[inline]
const fn const_impl(ptr: *mut (), align: usize) -> bool {
// We can't use the address of `self` in a `const fn`, so we use `align_offset` instead.
// The cast to `()` is used to
// 1. deal with fat pointers; and
// 2. ensure that `align_offset` doesn't actually try to compute an offset.
ptr.align_offset(align) == 0
}
// The cast to `()` is used to
// 1. deal with fat pointers; and
// 2. ensure that `align_offset` (in `const_impl`) doesn't actually try to compute an offset.
#[cfg_attr(not(bootstrap), allow(unused_unsafe))] // on bootstrap bump, remove unsafe block
// SAFETY: The two versions are equivalent at runtime.
unsafe {