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Less cloning in early otherwise branch #77472

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simonvandel wants to merge 8 commits into from
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Less cloning in early otherwise branch #77472

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e7811f9
Do not clone vec and bail early
simonvandel Oct 2, 2020
7a8c277
less clone
simonvandel Oct 2, 2020
62b6896
Remove duplicated check
simonvandel Oct 2, 2020
4784a5c
reorder checks from (intuitively) cheapest to most expensive
simonvandel Oct 2, 2020
586ba9d
Restructure data such that data about the first switch is not duplicated
simonvandel Oct 2, 2020
b4e144e
Move helper creation out of loop
simonvandel Oct 3, 2020
bd56b11
Use SwitchTargets instead of storing in Vec
simonvandel Oct 14, 2020
1a8d28a
Use otherwise from switchTargets
simonvandel Oct 14, 2020
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6 changes: 0 additions & 6 deletions compiler/rustc_mir/src/transform/early_otherwise_branch.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -250,12 +250,6 @@ impl<'a, 'tcx> Helper<'a, 'tcx> {
return None;
}

// check that the value being matched on is the same. The
if this_bb_discr_info.targets_with_values.iter().find(|x| x.0 == value).is_none() {
Comment on lines -256 to -257
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@jyn514 jyn514 Oct 30, 2020

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Where is this check duplicated? The check above does not look at targets_with_values at all.

trace!("NO: values being matched on are not the same");
return None;
}

// only allow optimization if the left and right of the tuple being matched are the same variants.
// so the following should not optimize
// ```rust
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