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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvm-cov: wrong coverage for statement with nested conditional operator"
href="https://bugs.llvm.org/show_bug.cgi?id=48795">48795</a>
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<th>Summary</th>
<td>llvm-cov: wrong coverage for statement with nested conditional operator
</td>
</tr>
<tr>
<th>Product</th>
<td>Runtime Libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>libprofile library
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yangyibiao@nju.edu.cn
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider this case:
...
$ cat small.c
int main()
{
int r = 0, z = 1;
for (int i = 0; i < 5; i++) {
r = (z * z > 4) ? (i < r ? i : r) : r;
z++;
}
return r;
}
...
...
$ clang -O0 -w -fcoverage-mapping -fprofile-instr-generate=small.profraw
small.c; ./a.out; llvm-profdata merge small.profraw -o small.profdata; llvm-cov
show a.out -instr-profile=small.profdata small.c > small.c.lcov; cat
small.c.lcov
1| |int main()
2| 1|{
3| 1| int r = 0, z = 1;
4| 6| for (int i = 0; i < 5; i++) {
5| 3| r = (z * z > 4) ? (i < r ? i : r) : r;
6| 5| z++;
7| 5| }
8| 1| return r;
9| 1|}
...
We can found that Line 5 is executed 3 times. The expected output should be 5.
...
$ clang --version
Ubuntu clang version
12.0.0-++20210117052627+ed396212da41-1~exp1~20210117163329.287
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin</pre>
</div>
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