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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [LLVM-COV] Wrong coverage with shift operators in macro"
href="https://bugs.llvm.org/show_bug.cgi?id=37071">37071</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[LLVM-COV] Wrong coverage with shift operators in macro
</td>
</tr>
<tr>
<th>Product</th>
<td>Runtime Libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>libprofile library
</td>
</tr>
<tr>
<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>$ cat small.c
#define ROR(a,b) (((a) >> (b)) | ((a) << ((sizeof (a) * 8) - (b))))
char c = 0xf234;
main ()
{
if (ROR (c, 4) != ROR (c, 4))
exit (1);
exit (0);
}
$ clang -w -O0 -g -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.gcov; cat small.gcov
1| 2|#define ROR(a,b) (((a) >> (b)) | ((a) << ((sizeof (a) * 8) -
(b))))
2| |
3| |char c = 0xf234;
4| |
5| |main ()
6| 1|{
7| 1| if (ROR (c, 4) != ROR (c, 4))
8| 1| exit (1);
9| 1|
10| 1| exit (0);
11| 1|}
Line #8 is wrongly marked as executed.</pre>
</div>
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