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archived-llvm/lib/ProfileData
Vedant Kumar 71a5ad442b [Coverage] Ignore 'unused' functions with non-zero execution counts
Frontends emit 'unused' coverage mapping records for functions which are
provably unused in a TU. These unused records contain a single counter
with CounterKind::Zero. However, a function may be unused in one TU and
used in another. When this happens, prefer the records with a full set
of counters instead of arbitrarily picking the first loaded record.

There is no impact on the single-TU case. In the multiple-TU case, this
resolves issues causing a function to appear unused when it's not.

Testing: check-{llvm,clang,compiler-rt}

rdar://42981322

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339194 91177308-0d34-0410-b5e6-96231b3b80d8
2018-08-07 22:25:36 +00:00
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