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Describe why size_align have not been inlined so far

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This commit is contained in:
Tomasz Miąsko 2020-12-10 00:00:00 +00:00
parent f0f68778f7
commit cf5bd26329
1 changed files with 6 additions and 0 deletions
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6
library/core/src/alloc/layout.rs
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@ -4,6 +4,12 @@ use crate::mem;
use crate::num::NonZeroUsize; use crate::num::NonZeroUsize;
use crate::ptr::NonNull; use crate::ptr::NonNull;
// While this function is used in one place and its implementation
// could be inlined, the previous attempts to do so made rustc
// slower:
//
// * https://github.com/rust-lang/rust/pull/72189
// * https://github.com/rust-lang/rust/pull/79827
const fn size_align<T>() -> (usize, usize) { const fn size_align<T>() -> (usize, usize) {
(mem::size_of::<T>(), mem::align_of::<T>()) (mem::size_of::<T>(), mem::align_of::<T>())
} }