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Try to shrink Alignment-related MIR in Layout #128918

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7 changes: 6 additions & 1 deletion library/core/src/ptr/alignment.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -94,7 +94,12 @@ impl Alignment {
#[rustc_const_unstable(feature = "ptr_alignment_type", issue = "102070")]
#[inline]
pub const fn as_usize(self) -> usize {
self.0 as usize
// It would be possible to do this with `self.0 as _`, but that results
// in way more MIR -- mostly because of the assume -- which ends up
// impacting compilation time for things using `Layout`.

// SAFETY: this type is a subset of the possible values of usize.
unsafe { mem::transmute::<Alignment, usize>(self) }
}

/// Returns the alignment as a <code>[NonZero]<[usize]></code>.
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