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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 - functions with empty body are wrongly optimized"
href="https://bugs.llvm.org/show_bug.cgi?id=33299">33299</a>
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<th>Summary</th>
<td>functions with empty body are wrongly optimized
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>4.0
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>yangyibiao@nju.edu.cn
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18571" name="attach_18571" title="the test file for reproduce this bug">attachment 18571</a> <a href="attachment.cgi?id=18571&action=edit" title="the test file for reproduce this bug">[details]</a></span>
the test file for reproduce this bug
/* test.c */
#include "stdio.h"
static int g;
static int arr[2] = {0, 1};
static int f1()
{
// function with empty body
}
static void f()
{
g = f1();
}
void main(int argc, char **argv)
{
f();
printf("%d\n", arr[g]);
}
/* end of test.c */
With/without optimization when compiling the attached file "test.c", the
outputs are different.
the command for compile the attached file is as follows:
$ clang -O0 test.c -o test0
$ clang -O1 test.c -o test1
$ clang -O2 test.c -o test2
$ clang -O3 test.c -o test3
$ clang -Ofast test.c -o test4</pre>
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