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Describe why size_align have not been inlined so far #79827

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Jan 3, 2021
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Describe why size_align have not been inlined so far #79827

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6 changes: 6 additions & 0 deletions library/core/src/alloc/layout.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,12 @@ use crate::mem;
use crate::num::NonZeroUsize;
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) {
(mem::size_of::<T>(), mem::align_of::<T>())
}
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