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authorMatthias Krüger <matthias.krueger@famsik.de>2024-07-15 21:11:50 +0200
committerGitHub <noreply@github.com>2024-07-15 21:11:50 +0200
commite5d65e46ed2734b0c20aa9d8159c1b31121a72ef (patch)
tree15f7d24652c8018ff2bd6fe83bb99067a13d19b9 /compiler/rustc_llvm/src
parentcd25232656623fd956aff8b6af83638a7225ad27 (diff)
parentd4f1f9242624f007c48d358ae3f62d046dee8925 (diff)
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Rollup merge of #127758 - Zalathar:expression-used, r=oli-obk
coverage: Restrict `ExpressionUsed` simplification to `Code` mappings

In the future, branch and MC/DC mappings might have expressions that don't correspond to any single point in the control-flow graph. That makes it trickier to keep track of which expressions should expect an `ExpressionUsed` node.

We therefore sidestep that complexity by only performing `ExpressionUsed` simplification for expressions associated directly with ordinary `Code` mappings.

(This simplification step is inherited from the original coverage implementation, which only supported `Code` mappings anyway, so there's no particular reason to extend it to other kinds of mappings unless we specifically choose to.)

Relevant to:
- #124154
- #126677
- #124278

```@rustbot``` label +A-code-coverage
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