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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 for a return statement with ternary operator"
href="https://bugs.llvm.org/show_bug.cgi?id=51022">51022</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[llvm-cov] wrong coverage for a return statement with ternary operator
</td>
</tr>
<tr>
<th>Product</th>
<td>Runtime Libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>12.0
</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>byone.heng@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$./clang -v
clang version 12.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
b6c8feb29fce39121884f7e08ec6eb0f58da3fb7)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/x/project/llvm-project/build/install/bin/.
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$cat test.c
———————————————————
static volatile signed char true_var = 1;
static const volatile signed char false_var = 0;
extern void abort ();
int f(int x)
{
return (x >> (sizeof (x) * __CHAR_BIT__ - 1)) ? -1 : 1;
}
volatile int one = 1;
int main (void)
{
/* Test that the function above returns different values for
different signs. */
if (f(one) == f(-one))
abort ();
return 0;
}
——————————————————
$clang -O0 -g -fcoverage-mapping -fprofile-instr-generate=test.profraw test.c;
./a.out; llvm-profdata merge test.profraw -o test.profdata; llvm-cov show a.out
-instr-profile=test.profdata test.c > test.lcov; cat test.lcov
2| |static volatile signed char true_var = 1;
3| |static const volatile signed char false_var = 0;
4| |extern void abort ();
5| |
6| |int f(int x)
7| 2|{
8| 1| return (x >> (sizeof (x) * __CHAR_BIT__ - 1)) ? -1 : 1;
9| 2|}
10| |
11| |volatile int one = 1;
12| |int main (void)
13| 1|{
14| | /* Test that the function above returns different values for
15| | different signs. */
16| 1| if (f(one) == f(-one))
17| 0| abort ();
18| 1| return 0;
19| 1|}
20| |
Line 8 should be executed twice.</pre>
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