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Because CGU merging relies on CGU sizes, but the CGU sizes before inlining aren't accurate. This requires tweaking how the sizes are updated during merging: if CGU A and B both have an inlined function F, then `size(A + B)` will be a little less than `size(A) + size(B)`, because `A + B` will only have one copy of F. Also, the minimum CGU size is increased because it now has to account for inlined functions. This change doesn't have much effect on compile perf, but it makes follow-on changes that involve more sophisticated reasoning about CGU sizes much easier. |
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| .. | ||
| src | ||
| Cargo.toml | ||
| messages.ftl | ||
| README.md | ||
For more information about how rustc works, see the rustc dev guide.