fix codecov accuracy for optimized and dead statements #34254
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| codeloc = ci.codelocs[idx] | ||
| if coverage && codeloc != prevloc && codeloc != 0 | ||
| # insert a side-effect instruction before the current instruction in the same basic block | ||
| insert!(code, idx, Expr(:code_coverage_marker)) |
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Julia 1.5 introduced annotations to improve line-coverage analysis (see JuliaLang/julia#34254). We just have to make sure these don't contaminate our tests.
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As people have noted (e.g #28192), Keno made the optimizer much too good. Rather than making the optimizer worse, we instead here preprocess the IR to inject a weak compiler barrier at each line change. This ensures we preserve the line number record, even if we drop all other side-effects at that point.