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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Integer division expression not correctly evaluated"
href="https://llvm.org/bugs/show_bug.cgi?id=27257">27257</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Integer division expression not correctly evaluated
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tgfbeta@me.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16180" name="attach_16180" title="output with logging enabled.">attachment 16180</a> <a href="attachment.cgi?id=16180&action=edit" title="output with logging enabled.">[details]</a></span>
output with logging enabled.
In lldb bundled with Xcode 7.3 and Swift 2.2 Release for Ubuntu 14.04, integer
division expression is not correctly evaluated.
When debugging the following code:
$ cat /tmp/a.cpp
#include <cstdio>
int main() {
int b = 800;
printf("%d\n", b);
return 0;
}
$ clang -o /tmp/x -g /tmp/a.cpp
, integer division in expr is not evaluated correctly, while floating point
division seems to be good:
$ lldb /tmp/x
(lldb) target create "/tmp/x"
Current executable set to '/tmp/x' (x86_64).
(lldb) b 4
Breakpoint 1: where = x`main + 29 at a.cpp:4, address = 0x0000000100000f6d
(lldb) run
Process 46865 launched: '/tmp/x' (x86_64)
Process 46865 stopped
* thread #1: tid = 0x5e9061, 0x0000000100000f6d x`main + 29 at a.cpp:4, queue =
'com.apple.main-thread', stop reason = breakpoint 1.1
frame #0: 0x0000000100000f6d x`main + 29 at a.cpp:4
1 #include <cstdio>
2 int main() {
3 int b = 800;
-> 4 printf("%d\n", b);
5 return 0;
6 }
(lldb) p b / 1
(int) $0 = 0
(lldb) p b / 2
(int) $1 = 0
(lldb) p b / 6
(int) $2 = 1
(lldb) p b / 13
(int) $3 = 1
(lldb) p b / 4.0
(double) $4 = 200</pre>
</div>
</p>
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