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Attempt to compress representation.

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This commit is contained in:
Camille Gillot
2025-10-17 21:11:53 +00:00
parent 73264f21e9
commit 0b02102dc0
2 changed files with 11 additions and 4 deletions
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9
compiler/rustc_mir_transform/src/deduce_param_attrs.rs
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@@ -170,16 +170,17 @@ pub(super) fn deduced_param_attrs<'tcx>(
deduce_read_only.visit_body(body);
tracing::trace!(?deduce_read_only.read_only);
let mut deduced_param_attrs = tcx.arena.alloc_from_iter(
let mut deduced_param_attrs: &[_] = tcx.arena.alloc_from_iter(
deduce_read_only.read_only.into_iter().map(|read_only| DeducedParamAttrs { read_only }),
);
// Trailing parameters past the size of the `deduced_param_attrs` array are assumed to have the
// default set of attributes, so we don't have to store them explicitly. Pop them off to save a
// few bytes in metadata.
while deduced_param_attrs.last() == Some(&DeducedParamAttrs::default()) {
let last_index = deduced_param_attrs.len() - 1;
deduced_param_attrs = &mut deduced_param_attrs[0..last_index];
while let Some((last, rest)) = deduced_param_attrs.split_last()
&& last.is_default()
{
deduced_param_attrs = rest;
}
deduced_param_attrs