Fix dead_code_cgu computation
#112639
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Fix dead_code_cgu computation
#112639
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The other major steps in `partition` have their own function, so it's nice for this one to be likewise.
The comment says "Find the smallest CGU that has exported symbols and put the dead function stubs in that CGU". But the code sorts the CGUs by size (smallest first) and then searches them in reverse order, which means it will find the *largest* CGU that has exported symbols. The erroneous code was introduced in rust-lang#92142. This commit changes it to use a simpler search, avoiding the sort, and fixes the bug in the process.
Always put the `create_size_estimate` calls and `debug_dump` calls within a timed scopes. This makes the four main steps look more similar to each other.
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Best reviewed one commit at a time. @bors rollup |
wesleywiser
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Jun 16, 2023
| let dead_code_cgu = codegen_units | ||
| .iter_mut() | ||
| .filter(|cgu| cgu.items().iter().any(|(_, (linkage, _))| *linkage == Linkage::External)) | ||
| .min_by_key(|cgu| cgu.size_estimate()); |
|
@bors r+ |
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This was referenced Jun 16, 2023
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This PR fixes a bug in
dead_code_cgucomputation, and also does some refactoring.r? @wesleywiser