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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Inconsistent Output at O1 optimization level"
href="http://llvm.org/bugs/show_bug.cgi?id=21440">21440</a>
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<th>Summary</th>
<td>Inconsistent Output at O1 optimization level
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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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>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>sardask01@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>andrea.dibiagio@gmail.com, david.majnemer@gmail.com, dexonsmith@apple.com, llvmbugs@cs.uiuc.edu, rafael.espindola@gmail.com
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Test case :
suyog@suyog-Inspiron-N5010:~$ cat 1.c
#include<stdio.h>
int foo(long a) {
long b = --a;
return b > 0;
}
int main() {
int x;
if(foo(0x80000000L)==0)
printf("Hi\n");
else printf("Hello\n");
return 0;
}
With -O0 output is :
suyog@suyog-Inspiron-N5010:~$ Open/build-llvm-Desktop-Default/bin/clang -O0 1.c
suyog@suyog-Inspiron-N5010:~$ ./a.out
Hello
With -O1 output is :
suyog@suyog-Inspiron-N5010:~$ Open/build-llvm-Desktop-Default/bin/clang -O1 1.c
suyog@suyog-Inspiron-N5010:~$ ./a.out
Hi
With -O12 output is :
suyog@suyog-Inspiron-N5010:~$ Open/build-llvm-Desktop-Default/bin/clang -O2 1.c
suyog@suyog-Inspiron-N5010:~$ ./a.out
Hello
The trunk revision is 220994</pre>
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